{"product_id":"tx433-th-3-433mhz-spring-antenna","title":"Cdsenet TX433-TH-3 433MHz Spring Antenna 1.0 dBi Gain PCB Mount","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; color: #333; line-height: 1.6; max-width: 1000px; margin: 0 auto; padding: 10px;\"\u003e\n\u003csection style=\"margin-bottom: 40px;\"\u003e\n\u003ch2 style=\"font-size: 24px; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 20px;\"\u003eProduct Overview\u003c\/h2\u003e\n\n\u003cp style=\"font-size: 16px; color: #444; margin-bottom: 20px;\"\u003eThe \u003cstrong\u003eTX433-TH-3\u003c\/strong\u003e is a compact 433MHz helical spring antenna delivering \u003cstrong\u003e1.0 dBi gain\u003c\/strong\u003e with VSWR ¡Ü1.5 across the ISM band (433.05-434.79 MHz). Featuring a space-saving helical coil design and direct PCB soldering interface, this antenna provides reliable omnidirectional RF performance for wireless modules, remote controls, and IoT devices. The spring construction offers mechanical flexibility and shock resistance, making it ideal for compact consumer electronics and industrial applications requiring a low-profile antenna solution. \u003cem\u003eUpdated March 2026.\u003c\/em\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cimg alt=\"TX433-TH-3 433MHz helical spring antenna with 1.0 dBi gain and PCB soldering interface\" cke-id=\"img31\" loading=\"lazy\" referrerpolicy=\"no-referrer\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0702\/9918\/9350\/files\/TX433-TH-3.png?v=1773819363\"\u003e\u003c\/div\u003e\u003c\/section\u003e\n\n\u003csection style=\"margin-bottom: 40px;\"\u003e\n\u003ch2 style=\"font-size: 22px; color: #111; margin-bottom: 15px;\"\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003cdiv style=\"overflow-x: auto;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px; text-align: left; border: 1px solid #ececec;\"\u003e\n\t\u003cthead\u003e\n\t\t\u003ctr style=\"background-color: #f9f9f9; border-bottom: 2px solid #eee;\"\u003e\n\t\t\t\u003cth style=\"padding: 12px; font-weight: bold; color: #333;\"\u003eParameter\u003c\/th\u003e\n\t\t\t\u003cth style=\"padding: 12px; font-weight: bold; color: #333;\"\u003eTechnical Value\u003c\/th\u003e\n\t\t\u003c\/tr\u003e\n\t\u003c\/thead\u003e\n\t\u003ctbody\u003e\n\t\t\u003ctr style=\"border-bottom: 1px solid #f0f0f0;\"\u003e\n\t\t\t\u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eFrequency Range\u003c\/td\u003e\n\t\t\t\u003ctd style=\"padding: 12px;\"\u003e433 MHz (ISM Band: 433.05-434.79 MHz)\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr style=\"border-bottom: 1px solid #f0f0f0; background-color: #fafafa;\"\u003e\n\t\t\t\u003ctd style=\"padding: 12px; font-weight: 600;\"\u003ePeak Gain\u003c\/td\u003e\n\t\t\t\u003ctd style=\"padding: 12px;\"\u003e1.0 dBi\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr style=\"border-bottom: 1px solid #f0f0f0;\"\u003e\n\t\t\t\u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eVSWR\u003c\/td\u003e\n\t\t\t\u003ctd style=\"padding: 12px; font-weight: bold; color: #e4393c;\"\u003e¡Ü 1.5 @ 433 MHz\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr style=\"border-bottom: 1px solid #f0f0f0; background-color: #fafafa;\"\u003e\n\t\t\t\u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eInput Impedance\u003c\/td\u003e\n\t\t\t\u003ctd style=\"padding: 12px;\"\u003e50 ¦¸\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr style=\"border-bottom: 1px solid #f0f0f0;\"\u003e\n\t\t\t\u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eConnector Type\u003c\/td\u003e\n\t\t\t\u003ctd style=\"padding: 12px;\"\u003eDirect PCB Soldering (Wire Lead)\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr style=\"border-bottom: 1px solid #f0f0f0; background-color: #fafafa;\"\u003e\n\t\t\t\u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eAntenna Type\u003c\/td\u003e\n\t\t\t\u003ctd style=\"padding: 12px;\"\u003eHelical Spring (Omnidirectional)\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr style=\"border-bottom: 1px solid #f0f0f0;\"\u003e\n\t\t\t\u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eAntenna Height\u003c\/td\u003e\n\t\t\t\u003ctd style=\"padding: 12px;\"\u003e30 mm (1.18 inches, compressed)\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr style=\"border-bottom: 1px solid #f0f0f0; background-color: #fafafa;\"\u003e\n\t\t\t\u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eWire Diameter\u003c\/td\u003e\n\t\t\t\u003ctd style=\"padding: 12px;\"\u003e0.5 mm (AWG 24)\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr style=\"border-bottom: 1px solid #f0f0f0;\"\u003e\n\t\t\t\u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eMaterial\u003c\/td\u003e\n\t\t\t\u003ctd style=\"padding: 12px;\"\u003eCopper Wire (Tin-Plated)\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr style=\"border-bottom: 1px solid #f0f0f0; background-color: #fafafa;\"\u003e\n\t\t\t\u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eOperating Temperature\u003c\/td\u003e\n\t\t\t\u003ctd style=\"padding: 12px;\"\u003e-40¡ãC to +85¡ãC\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr style=\"border-bottom: 1px solid #f0f0f0;\"\u003e\n\t\t\t\u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eCertification\u003c\/td\u003e\n\t\t\t\u003ctd style=\"padding: 12px;\"\u003eRoHS Compliant\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr style=\"border-bottom: 1px solid #f0f0f0; background-color: #fafafa;\"\u003e\n\t\t\t\u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eUpdated\u003c\/td\u003e\n\t\t\t\u003ctd style=\"padding: 12px;\"\u003eMarch 2026\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection style=\"margin-bottom: 40px;\"\u003e\n\u003ch2 style=\"font-size: 22px; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 25px;\"\u003eProduct Details\u003c\/h2\u003e\n\n\u003cdiv style=\"background: #ffffff; border: 1px solid #eee; border-radius: 8px; padding: 20px; margin-bottom: 20px;\"\u003e\n\u003ch3 style=\"font-size: 18px; color: #111; margin: 0 0 10px 0;\"\u003eCompact Helical Spring Design for Space-Constrained Applications\u003c\/h3\u003e\n\n\u003cp style=\"font-size: 14px; color: #666; margin-bottom: 15px;\"\u003eThe TX433-TH-3 features a precision-wound helical coil construction that compresses the antenna's electrical length into a compact 30mm physical height, making it ideal for space-constrained PCB designs and portable devices. The spring design provides omnidirectional radiation pattern with consistent performance across all horizontal directions. The copper wire construction with tin plating ensures excellent conductivity and corrosion resistance, while the flexible spring structure offers mechanical shock absorption and vibration resistance, critical for mobile and handheld applications.\u003c\/p\u003e\n\u003cdiv\u003e\u003cimg alt=\"TX433-TH-3 compact helical spring antenna design\" cke-id=\"img32\" loading=\"lazy\" referrerpolicy=\"no-referrer\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0702\/9918\/9350\/files\/TX433-TH-3.png?v=1773819363\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background: #ffffff; border: 1px solid #eee; border-radius: 8px; padding: 20px;\"\u003e\n\u003ch3 style=\"font-size: 18px; color: #111; margin: 0 0 10px 0;\"\u003eDirect PCB Soldering Interface for Easy Integration\u003c\/h3\u003e\n\n\u003cp style=\"font-size: 14px; color: #666; margin-bottom: 15px;\"\u003eThe antenna features a wire lead termination designed for direct soldering to PCB pads or through-hole mounting, eliminating the need for bulky connectors and reducing overall system cost. The 0.5mm (AWG 24) tinned copper wire provides reliable electrical contact and mechanical stability when properly soldered. This interface is particularly suitable for high-volume manufacturing where automated pick-and-place and wave soldering processes are used. The antenna maintains 50¦¸ impedance matching when mounted vertically on a properly designed ground plane (minimum 40mm ¡Á 40mm recommended).\u003c\/p\u003e\n\u003cdiv\u003e\u003cimg alt=\"TX433-TH-3 PCB soldering interface and mounting detail\" cke-id=\"img33\" loading=\"lazy\" referrerpolicy=\"no-referrer\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0702\/9918\/9350\/files\/TX433-TH-3-1.png?v=1773819364\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection style=\"margin-bottom: 40px;\"\u003e\n\u003ch2 style=\"font-size: 22px; color: #111; margin-bottom: 15px;\"\u003eProfessional Test Report\u003c\/h2\u003e\n\n\u003cdiv style=\"background-color: #f8fbff; border: 1px solid #e1ecf7; border-radius: 8px; padding: 20px; text-align: center;\"\u003e\n\u003cp style=\"font-size: 15px; color: #1e3a8a; margin-bottom: 15px;\"\u003eVerified using professional RF test equipment at 433 MHz center frequency: VSWR measured consistently \u003cstrong\u003e¡Ü 1.5\u003c\/strong\u003e across the ISM band (433.05-434.79 MHz), ensuring efficient power transfer and minimal reflected energy. Return loss (S11) exceeds -14 dB throughout the operational bandwidth, confirming excellent impedance matching to 50¦¸ systems. The omnidirectional radiation pattern provides consistent coverage with gain variation less than ¡À2 dB across the horizontal plane, ideal for applications requiring uniform signal distribution.\u003c\/p\u003e\n\n\u003cp style=\"color: #999; font-style: italic; font-size: 12px;\"\u003e(Complete VSWR \/ S11 \/ radiation pattern measurements available upon request)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection style=\"margin-bottom: 40px;\"\u003e\n\u003ch2 style=\"font-size: 22px; color: #111; margin-bottom: 25px;\"\u003eIdeal Applications\u003c\/h2\u003e\n\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 20px;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; min-width: 280px; border: 1px solid #f0f0f0; border-radius: 10px; padding: 15px; background: #fff;\"\u003e\n\u003ch3 style=\"font-size: 17px; margin: 0 0 8px 0; color: #0056b3;\"\u003eWireless Remote Controls\u003c\/h3\u003e\n\n\u003cp style=\"font-size: 14px; color: #666; margin-bottom: 15px;\"\u003ePerfect for 433MHz RF remote controls for garage doors, gate openers, car alarms, and home automation systems requiring compact, reliable antenna solutions.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"flex: 1 1 300px; min-width: 280px; border: 1px solid #f0f0f0; border-radius: 10px; padding: 15px; background: #fff;\"\u003e\n\u003ch3 style=\"font-size: 17px; margin: 0 0 8px 0; color: #0056b3;\"\u003eIoT Wireless Modules\u003c\/h3\u003e\n\n\u003cp style=\"font-size: 14px; color: #666; margin-bottom: 15px;\"\u003eIdeal for 433MHz LoRa modules (SX1278, HC-12), FSK\/ASK transceivers, and low-power wireless sensor nodes in smart home and industrial IoT applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"flex: 1 1 300px; min-width: 280px; border: 1px solid #f0f0f0; border-radius: 10px; padding: 15px; background: #fff;\"\u003e\n\u003ch3 style=\"font-size: 17px; margin: 0 0 8px 0; color: #0056b3;\"\u003eConsumer Electronics\u003c\/h3\u003e\n\n\u003cp style=\"font-size: 14px; color: #666; margin-bottom: 15px;\"\u003eSuitable for wireless keyboards, mice, game controllers, and other consumer devices operating in the 433MHz ISM band requiring low-profile antenna integration.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"flex: 1 1 300px; min-width: 280px; border: 1px solid #f0f0f0; border-radius: 10px; padding: 15px; background: #fff;\"\u003e\n\u003ch3 style=\"font-size: 17px; margin: 0 0 8px 0; color: #0056b3;\"\u003eSecurity \u0026amp; Alarm Systems\u003c\/h3\u003e\n\n\u003cp style=\"font-size: 14px; color: #666; margin-bottom: 15px;\"\u003eReliable antenna for wireless door\/window sensors, motion detectors, and security system components requiring omnidirectional coverage in residential and commercial installations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection style=\"margin-bottom: 40px;\"\u003e\n\u003ch2 style=\"font-size: 22px; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 25px;\"\u003eResources\u003c\/h2\u003e\n\n\u003cp style=\"font-size: 14px; color: #666; margin-bottom: 15px;\"\u003eFor detailed technical specifications, PCB layout guidelines, and integration recommendations, please contact our technical support team or refer to the CDEBYTE 433MHz antenna application notes.\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection style=\"border-top: 1px solid #eee; padding-top: 30px;\"\u003e\n\u003ch2 style=\"font-size: 20px; color: #111; margin-bottom: 20px;\"\u003eFrequently Asked Questions (FAQ)\u003c\/h2\u003e\n\n\u003cdiv style=\"margin-bottom: 20px; padding: 15px; background: #f9f9f9; border-left: 4px solid #0056b3; border-radius: 4px;\"\u003e\n\u003cp style=\"font-weight: bold; margin-bottom: 8px; color: #111;\"\u003eQ: How do I properly solder this antenna to my PCB?\u003c\/p\u003e\n\n\u003cp style=\"color: #666; margin: 0; font-size: 14px; line-height: 1.6;\"\u003eA: The TX433-TH-3 features a tinned copper wire lead designed for through-hole or surface-mount soldering. For optimal performance, mount the antenna vertically (perpendicular to the PCB) and solder the wire lead to a PCB pad connected to your RF transceiver's antenna output via a 50¦¸ transmission line. Ensure a proper ground plane (minimum 40mm ¡Á 40mm) is present on the PCB to serve as the antenna's counterpoise. Use standard lead-free solder (SAC305) at 350-370¡ãC with a soldering time of 2-3 seconds to avoid thermal damage to the spring coil. Avoid excessive mechanical stress during soldering to prevent detuning.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-bottom: 20px; padding: 15px; background: #f9f9f9; border-left: 4px solid #0056b3; border-radius: 4px;\"\u003e\n\u003cp style=\"font-weight: bold; margin-bottom: 8px; color: #111;\"\u003eQ: What is the expected range with this antenna?\u003c\/p\u003e\n\n\u003cp style=\"color: #666; margin: 0; font-size: 14px; line-height: 1.6;\"\u003eA: Communication range depends on transmitter power, receiver sensitivity, modulation scheme, and environmental conditions. With a typical 10mW (10dBm) 433MHz transmitter and -110dBm receiver sensitivity, expect line-of-sight range of 100-300 meters in open areas. The 1.0 dBi gain provides approximately 1.25x range improvement compared to a 0 dBi reference antenna. Indoor range will be significantly reduced (20-50 meters) due to wall attenuation and multipath interference. For extended range, consider higher transmit power (within regulatory limits of 10mW ERP in Europe, 1W in USA) or using higher-gain external antennas.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-bottom: 20px; padding: 15px; background: #f9f9f9; border-left: 4px solid #0056b3; border-radius: 4px;\"\u003e\n\u003cp style=\"font-weight: bold; margin-bottom: 8px; color: #111;\"\u003eQ: Is this antenna suitable for outdoor applications?\u003c\/p\u003e\n\n\u003cp style=\"color: #666; margin: 0; font-size: 14px; line-height: 1.6;\"\u003eA: The TX433-TH-3 is designed primarily for indoor or protected outdoor applications. The tin-plated copper wire provides basic corrosion resistance and operates reliably across -40¡ãC to +85¡ãC temperature range. However, for harsh outdoor environments with direct weather exposure, we recommend enclosing the antenna in a weatherproof enclosure with a radome (plastic cover) to protect against moisture, UV degradation, and physical damage. The antenna is RoHS compliant and suitable for consumer and industrial applications. For permanent outdoor installations, consider our weatherproof external antenna options with IP67-rated connectors.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-bottom: 20px; padding: 15px; background: #f9f9f9; border-left: 4px solid #0056b3; border-radius: 4px;\"\u003e\n\u003cp style=\"font-weight: bold; margin-bottom: 8px; color: #111;\"\u003eQ: Can I use this antenna with LoRa modules operating at 433MHz?\u003c\/p\u003e\n\n\u003cp style=\"color: #666; margin: 0; font-size: 14px; line-height: 1.6;\"\u003eA: Yes, the TX433-TH-3 is fully compatible with 433MHz LoRa modules (SX1276, SX1278, SX1262 transceivers) and other modulation schemes (FSK, GFSK, OOK, ASK) operating in the 433MHz ISM band. The antenna's 50¦¸ impedance matches standard LoRa module RF outputs, and the VSWR ¡Ü1.5 ensures efficient power transfer across the LoRa bandwidth (typically 125-500 kHz). For optimal LoRa performance, ensure proper PCB layout with adequate ground plane, minimize trace length between the module and antenna, and consider adding a ¦Ð-network or LC matching circuit if VSWR optimization is required for your specific PCB layout.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"padding: 15px; background: #f9f9f9; border-left: 4px solid #0056b3; border-radius: 4px;\"\u003e\n\u003cp style=\"font-weight: bold; margin-bottom: 8px; color: #111;\"\u003eQ: What PCB design considerations are important for this antenna?\u003c\/p\u003e\n\n\u003cp style=\"color: #666; margin: 0; font-size: 14px; line-height: 1.6;\"\u003eA: For optimal performance, follow these PCB design guidelines: (1) Provide a solid ground plane of at least 40mm ¡Á 40mm on the PCB layer directly beneath the antenna mounting point. (2) Mount the antenna vertically at the edge or corner of the PCB to maximize omnidirectional coverage. (3) Keep the antenna at least 10mm away from metal enclosures, batteries, and other RF-sensitive components. (4) Use a 50¦¸ microstrip or coplanar waveguide transmission line to connect the antenna feed point to your RF module, keeping trace length below 20mm to minimize losses. (5) Avoid routing digital signals or power traces near the antenna feed to prevent RF interference. (6) Consider adding a ¦Ð-network (series inductor + shunt capacitors) for fine-tuning impedance matching if needed. Reference application notes from your RF module manufacturer for specific layout recommendations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n","brand":"cdsenet","offers":[{"title":"Default Title","offer_id":45196040634470,"sku":"TX433-TH-3","price":0.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0702\/9918\/9350\/files\/TX433-TH-3-_1_800x800_v2.jpg?v=1773459963","url":"https:\/\/cdsenet.store\/products\/tx433-th-3-433mhz-spring-antenna","provider":"CDSENET, Built for the Wireless World","version":"1.0","type":"link"}