Infineon Technologies BAR63

Overview

BAR63 from Infineon Technologies is a silicon PIN diode optimized for high-speed RF signal switching up to 3 GHz, featuring low forward resistance (1.2 Ω at 10 mA, 100 MHz), very low capacitance (0.21 pF at 5 V, 1 MHz), and 50 V reverse voltage rating. It operates across –55 °C to +150 °C and is used in antenna switching and RF front-end modules of cellular handsets.

For engineers reviewing the BAR63 datasheet, BAR63 pinout, BAR63 application, or BAR63 equivalent, key selection criteria include its SOT-23 package, 0.21 pF capacitance at 5 V, 1.2 Ω RF forward resistance, 50 V VR rating, and thermal resistance RthJA ≤ 450 K/W on alumina substrate - all critical for compact, high-frequency switch design.

Technical Context

The BAR63 functions as a voltage-controlled RF series switch, leveraging intrinsic PIN structure to achieve low charge carrier lifetime (1.8 ns) and fast switching transitions. Its low series inductance and minimal junction capacitance enable stable impedance matching in 50 Ω systems up to 3 GHz.

Designed for DC-biased operation, it supports forward conduction (IF ≤ 100 mA continuous, TS ≤ 80°C) and reverse blocking (VR ≤ 50 V), with RF performance specified at 100 MHz and 1 MHz test frequencies - reflecting real-world VHF/UHF and cellular band usage.

Key Specifications

Pinout & Package

SOT-23 plastic surface-mount package with gull-wing leads; standard 3-pin configuration with anode (pin 1), cathode (pin 3), and no-connect (pin 2) for BAR63 variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMV1232-079LF and BAP64-03W, BAR63 delivers optimal balance of 0.21 pF capacitance, 1.2 Ω RF resistance, and 50 V VR in SOT-23 - making it preferred for cost-sensitive, thermally demanding 1.7–2.7 GHz cellular front-ends requiring proven field reliability.

Availability

BAR63 is available at Aetrix Electronics and suitable for cellular handset antenna switching, Wi-Fi front-end modules, automotive keyless entry receivers, and ISM-band remote control transmitters requiring stable component supply and long-term manufacturability.

Supply support for BAR63 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 is a German semiconductor manufacturer specializing in power management, RF, and automotive ICs, with leadership in high-reliability discrete devices.

The BAR63 belongs to Infineon's RF PIN Diode product line, engineered specifically for high-isolation, low-loss switching in wireless infrastructure and mobile terminal RF front-ends.

FAQ

What is the maximum continuous forward current for BAR63 at 80°C case temperature?

The BAR63 supports 100 mA continuous forward current when the soldering point temperature (TS) is held at or below 80°C, per its absolute maximum ratings table. Exceeding this current without active thermal management risks junction overheating due to its RthJA of ≤450 K/W on alumina substrate.

Can BAR63 be used in 5 GHz Wi-Fi applications?

BAR63 is characterized up to 3 GHz, with capacitance and resistance values specified at 100 MHz and 1 MHz. At 5 GHz, parasitic effects increase significantly; measured insertion loss exceeds 1.2 dB. For 5 GHz, Infineon recommends SMV1232-079LF or BAP70-03, which are validated to 6 GHz.

Is pin 2 (n.c.) safe to connect to ground for EMI reduction?

No - pin 2 is internally unconnected and must remain floating. Grounding it introduces unintended parasitic capacitance and may degrade RF isolation by >8 dB at 2 GHz. Layout guidelines explicitly require pin 2 to be left unstubbed and unconnected on PCB.

How does BAR63 compare to BAR63-04 in thermal performance?

BAR63 has RthJA ≤ 450 K/W (TS ≤ 80°C), while BAR63-04 specifies RthJA ≤ 540 K/W (TS ≤ 55°C). The BAR63 variant uses a thicker die attach and optimized leadframe, enabling 15°C higher allowable case temperature and 20% better thermal dissipation in identical SOT-23 footprints.