NXP Semiconductors BAP51-06W,115

Overview

BAP51-06W from NXP Semiconductors is a dual silicon PIN diode in common-anode configuration housed in an SOT323 package, rated for 50 V reverse voltage, 50 mA forward current, and 240 mW total power dissipation. It delivers low diode capacitance (0.2–0.55 pF at 1–5 V), low forward resistance (1.5–9 Ω), and RF isolation up to 17 dB at 900 MHz - used in RF switching and antenna tuning circuits.

For engineers reviewing the BAP51-06W datasheet, BAP51-06W pinout, BAP51-06W application, or BAP51-06W equivalent, key selection criteria include its common-anode dual-diode topology, AEC-Q101 qualification for automotive use, SOT323 footprint compatibility, and verified RF performance at 900/1800/2450 MHz bands.

Technical Context

The BAP51-06W integrates two PIN diodes sharing a single anode terminal, enabling compact series-shunt RF switch topologies without external interconnects. Its intrinsic layer design yields low charge carrier lifetime (0.55 μs) and stable capacitance under reverse bias, supporting fast switching with minimal distortion.

Thermal resistance from junction to solder point is 250 K/W, and it operates across –65 °C to +150 °C junction temperature range. The device is characterized at 25 °C with guaranteed parameters including forward voltage (0.95–1.1 V at 50 mA), reverse current (<100 nA at 50 V), and insertion loss (0.19–0.54 dB depending on bias and frequency).

Key Specifications

Pinout & Package

SOT323 plastic surface-mounted package (3-lead, SC-70 compatible); dimensions: 2.2 × 1.35 × 0.95 mm (L × W × H), thermal pad not present, lead pitch 0.65 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BAR50-02W and NSVD5001MW6T1G, the BAP51-06W uniquely provides integrated common-anode dual-diode functionality in SOT323, eliminating external interconnects and enabling smaller, lower-parasitic RF switch designs - especially valuable in space-constrained automotive and portable wireless modules.

Availability

BAP51-06W is available at Aetrix Electronics and suitable for cellular front-end modules, automotive telematics systems, and ISM-band transceivers requiring stable component supply, AEC-Q101 compliance, and consistent RF performance across production batches.

Supply support for BAP51-06W 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The BAP51-06W belongs to NXP's RF PIN diode portfolio designed specifically for high-frequency switching and tuning in automotive-grade and consumer wireless infrastructure - emphasizing low parasitics, repeatable RF behavior, and robust thermal performance.

FAQ

What is the pin configuration of the BAP51-06W and how does it differ from standard single PIN diodes?

The BAP51-06W has three terminals: Pin 1 is Cathode 1, Pin 2 is Cathode 2, and Pin 3 is the Common Anode. This dual-diode, common-anode structure enables independent RF path control while sharing a single bias node - unlike single PIN diodes such as the BAP64-03, which require separate anode connections and increase PCB routing complexity in multi-path designs.

Is the BAP51-06W qualified for automotive applications, and what standards does it meet?

Yes, the BAP51-06W is AEC-Q101 qualified, meaning it has passed stress tests for temperature cycling, humidity, mechanical shock, and high-temperature operating life required for automotive electronics. This qualification confirms its suitability for use in infotainment systems, telematics control units, and ADAS radar front-ends where reliability under harsh environmental conditions is mandatory.

What is the typical diode capacitance of the BAP51-06W and how does it vary with reverse voltage?

The BAP51-06W exhibits a typical diode capacitance of 0.35 pF at 5 V reverse bias, 0.55 pF at 1 V, and 0.2 pF at 5 V (min), measured at 1 MHz. This voltage-dependent C_V characteristic allows predictable tuning of RF impedance in antenna matching networks - critical for maintaining VSWR across wideband operation from 900 MHz to 2.45 GHz.

How does forward current affect insertion loss in the BAP51-06W, and what is the optimal bias range?

Insertion loss in the BAP51-06W decreases with increasing forward current: it measures 0.54 dB at 0.5 mA, 0.43 dB at 1 mA, and 0.28 dB at 10 mA (at 2.45 GHz). Optimal bias is 5–10 mA - delivering sub-0.3 dB loss while staying well within the 50 mA absolute maximum rating and minimizing self-heating effects on long-term stability.

Can the BAP51-06W be used in both series and shunt RF switch configurations?

Yes, the BAP51-06W supports both configurations: as a series switch (anode grounded, cathodes in signal path) or shunt switch (cathodes grounded, anode in signal path). Its common-anode topology simplifies shunt implementation across dual paths, while individual cathode control enables hybrid topologies - e.g., one diode in series and the other in shunt for SPDT functionality without external passive components.