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ESD Protected LNA for 433 MHz (LoRa APRS) + 18dB Gain
ESD Protected LNA for 433 MHz (LoRa APRS) + 18dB Gain
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€49,50 EUR
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ESD-Protected LNA for 433 MHz (LoRa APRS) — +18 dB Gain with SAW Filtering
High-performance Low Noise Amplifier (LNA) optimized for 433 MHz applications such as LoRa APRS. Integrates robust ESD protection and a SAW band-pass filter (B39431B3710U410) for strong out-of-band rejection and clean reception in noisy RF environments.
Specs at a Glance
| Parameter | Specification |
|---|---|
| Center Frequency | 433 MHz (ISM band) |
| Gain | ≈ 18 dB |
| Noise Figure | ≈ 0.6 dB (typ.) |
| Linearity | IP3 > 41 dBm |
| P1dB | ≈ 22.5 dBm |
| Front-End Filter | SAW B39431B3710U410 (band-pass) |
| Power | 5 V / 3 V via Bias-T (remote injection) |
| Protection | ESD input protection + RF input protection |
Key Features
- Operating Frequency: 433 MHz (optimized for LoRa APRS and ISM-band receivers)
- Amplifier IC: Mini-Circuits PGA-103+
- Gain: ~18 dB for strong link-budget improvement
- Ultra-Low NF: ~0.6 dB for minimal system noise temperature
- High Linearity: IP3 > 41 dBm to resist desense from nearby transmitters
- P1dB: ~22.5 dBm for robust headroom
- Integrated SAW Filter: B39431B3710U410 for superior selectivity and out-of-band rejection
- Bias-T Power: 5 V or 3 V via coax (no extra power wires)
- ESD Protection: Built-in safeguards on the RF input
Additional Resources
Ideal where low noise, moderate gain, and excellent selectivity are required — from 433 MHz LoRa APRS iGates and receiver front-ends to general ISM-band monitoring. For best noise performance, mount the LNA as close to the antenna as practical.
Rejection vs Gain
Mini-FAQ
- Do I need a Bias-T? — Yes. The LNA is powered over the coax (5 V or 3 V). If your receiver lacks Bias-T, use an external injector.
- Where should I place it? — As close to the antenna as possible to minimize pre-LNA cable loss and improve system NF.
- Will strong nearby transmitters overload it? — The LNA is high-linearity (IP3 > 41 dBm) and filtered, but very strong signals may require extra filtering or separation.
- Is the input protected? — Yes. ESD protection is included on the RF input.
- Can I use it beyond 433 MHz? — The SAW filter is centered for 433 MHz. Usable bandwidth is narrow; for wideband work, use the non-filtered LNA version.
