Infineon Technologies BAR81WE6327BTSA1

Overview

BAR81WE6327BTSA1 from Infineon Technologies is a silicon RF switching diode configured as a single shunt-diode in SOT343 package, rated for 30 V reverse voltage and 100 mA forward current, with 0.93 V typical forward voltage at 100 mA and 0.57–0.6 pF capacitance at 1–3 V reverse bias; used in high-isolation RF switch designs operating up to 1.89 GHz.

For engineers reviewing the BAR81WE6327BTSA1 datasheet, BAR81WE6327BTSA1 pinout, BAR81WE6327BTSA1 application, or BAR81WE6327BTSA1 equivalent, key selection criteria include shunt insertion loss (≤30 dB at 1.89 GHz), isolation (≥0.7 dB at 1.89 GHz), forward resistance (0.7 Ω typ. at 100 MHz), junction temperature limit (150 °C), and SOT343 thermal resistance (RthJS ≤ 120 K/W).

Technical Context

This diode operates in shunt configuration where the anode serves as RF signal passage and cathode connects to ground; optimal performance requires a low-inductance ground path with series inductance ≤0.15 nH from chip to ground. Its I-region width of 3.5 µm enables fast carrier lifetime (τrr = 80 ns) and supports short–open transformation using λ/4 transmission lines.

AC performance is specified at 1.89 GHz with 10 mA forward bias for insertion loss and 3 V reverse bias for isolation; DC parameters include 20 nA max reverse leakage at 20 V and 100 mW total power dissipation at TA = 25°C with derating above Ts ≤ 138°C.

Key Specifications

Pinout & Package

SOT343 (SC-82AB) 4-pin plastic package with standard lead finish, 3.0 mm × 1.25 mm footprint, and 0.65 mm pitch; pin 1 marked by dot, pins 1–4 arranged counterclockwise starting from top-left corner when viewed from top with marking dot upper-left.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF shunt switching diode applications.

Compared with BAR81WE6327BTSA1, BAR81W E6327 offers identical RF performance with packaging variation only, while BAR81V6327 trades lower capacitance for higher leakage-making it suitable for higher-frequency, lower-voltage RF switches where isolation bandwidth outweighs leakage sensitivity.

Availability

BAR81WE6327BTSA1 is available at Aetrix Electronics and suitable for cellular front-end switching, Wi-Fi band-selection modules, ISM transmitter modulation, and RF test equipment attenuators requiring stable component supply across automotive-grade temperature ranges (−55 °C to +125 °C).

Supply support for BAR81WE6327BTSA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies AG is a German semiconductor manufacturer headquartered in Munich, specializing in power management, RF, and automotive ICs with ISO 9001 and IATF 16949 certification.

The BAR81W series belongs to Infineon's RF discrete portfolio, designed specifically for high-isolation, low-loss shunt switching in wireless infrastructure and mobile handset front-end modules operating from 800 MHz to 6 GHz.

FAQ

What is the recommended PCB layout for optimal RF isolation with BAR81WE6327BTSA1?

Place both cathode pins (2 and 4) directly over a solid ground plane with multiple vias within 1 mm of each pad; route anode traces (1 and 3) with controlled 50 Ω impedance and avoid stubs longer than λ/20 at the highest operating frequency. Keep series inductance from chip to ground below 0.15 nH using short, wide copper pours.

Can BAR81WE6327BTSA1 be used in series-switch configuration?

No - BAR81WE6327BTSA1 is characterized and optimized exclusively for shunt configuration. Its internal structure, pin assignment, and published AC parameters (insertion loss, isolation) assume cathode-grounded operation. Series use would violate design intent and yield unverified performance.

What is the maximum allowable RF peak current during pulsed operation?

At tp = 100 µs and duty cycle D = 0.01, peak forward current may reach 1000 mA per the permissible pulse load curve; however, average power must remain ≤100 mW. Thermal limits require junction temperature stay below 150 °C, enforced by RthJS ≤ 120 K/W and proper board-level heat sinking.

Does BAR81WE6327BTSA1 require external bias network filtering for 1.89 GHz operation?

Yes - a π-filter (series RF choke + shunt capacitor to ground) is required on the DC bias line to prevent RF leakage into the control circuitry. Use a 100 nH choke and 100 pF capacitor placed within 2 mm of Pin 1 to maintain >40 dB RF rejection at 1.89 GHz while preserving 10 mA bias stability.