# EPCOS B3781 SAW Filter

## Overview
This document details the EPCOS B3781 SAW filter, designed for low-loss RF filtering in short-range devices like remote control receivers. It operates at a center frequency of 315.00 MHz.

## Features
️· Package Size: 3.8 x 3.8 x 1.5 mm³ (QCC8B package)
️· RoHS Compatible: Compliant with Directive 2011/65/EU
️· Weight: Approximately 0.07 g
️· Surface Mount Technology (SMT): Suitable for SMT assembly
️· Terminals: Ni, gold-plated
️· Lead Free: Compatible with J-STD-20C
️· Passivation Layer: Elpas
️· AEC-Q200 Qualified: Automotive component family
️· ESD Sensitive: Requires precautions during handling

## Specifications
️· Temperature Range: -40°C to +85°C
️· Impedance: 50 Ω source and load
️· Center Frequency: 315.00 MHz
️· Minimum Insertion Attenuation: 1.1 - 2.5 dB
️· Passband: 314.725 - 315.275 MHz (0.9 - 3.0 dB attenuation)
️· Filter Bandwidth: 0.69 - 0.83 MHz (≤3 dB attenuation)
️· Maximum Ratings:
- Operable Temperature: -45°C to +125°C
- DC Voltage: 6V
- Source Power: 10 dBm

## Pin Configuration
️· 1: Input ground or input
️· 2: Input or input ground
️· 5: Output or output ground
️· 6: Output ground or output
️· 4, 8: Case - ground
️· 3, 7: Ground

## ESD Protection
ESD matching topologies are recommended at the filter input to protect against electrostatic discharge.

## Matching Network
The document provides information on the matching network components needed to achieve a 50 Ω impedance match:
️· Cp1 = 1.5 pF
️· Ls2 = 68 nH
️· Ls3 = 68 nH
️· Cp4 = 1.5 pF

## Important Notes
️· The product may contain hazardous substances.
️· The company reserves the right to change the product or discontinue production.
️· The device is ESD sensitive.
️· See data sheet for detailed electrical and mechanical specifications.