This is a low-loss RF filter for remote control receivers. It can be operated in both balanced and unbalanced mode.
The EPCOS B3781 SAW filter is a short‑range device designed for low‑loss RF applications such as remote‑control receivers. It supports both balanced and unbalanced operation and is supplied in a QCC8B surface‑mount package (3.8 × 3.8 × 1.5 mm). The filter is RoHS‑compatible, lead‑free and qualified to AEC‑Q200 standards.
The data sheet provides detailed electrical characteristics, recommended pin configurations to minimise crosstalk, matching network values, and ESD protection guidelines. It also includes transfer‑function plots, maximum ratings, and important safety notes for designers.
| Center frequency | 315.00 MHz |
|---|---|
| Package size | 3.8 × 3.8 × 1.5 mm |
| Package code | QCC8B |
| Minimum insertion attenuation | 1.8 dB |
| Pass‑band attenuation | 0.9 – 3.0 dB |
| Filter bandwidth (3 dB) | 0.69 – 0.83 MHz |
| Operating temperature range | -45 °C to +125 °C |
| DC voltage rating | 6 V |
| Source power rating | 10 dBm |
| RoHS compatible | Yes |
The recommended pin configuration (inputs on pins 1‑2, outputs on pins 5‑6, ground on pins 3‑4) offers the best suppression of electrical crosstalk.
The filter can operate from –45 °C up to +125 °C.
The center frequency is 315.00 MHz.