Nexperia USA Inc. BAT54A-QR

Overview

BAT54A-QR from Nexperia is a dual common-anode Schottky barrier diode in SOT23 package, designed for ultra-high-speed switching and reverse polarity protection in automotive electronics. It features 30 V reverse voltage rating, 800 mV max forward voltage at 100 mA, 2 µA max reverse current at 25 V, 10 pF capacitance at 1 V, and 5 ns reverse recovery time.

For engineers reviewing the BAT54A-QR datasheet, BAT54A-QR pinout, BAT54A-QR application, or BAT54A-QR equivalent, key selection criteria include low VF for power-sensitive clamping, low Cd for high-frequency line termination, AEC-Q101 qualification for automotive reliability, and dual-diode common-anode topology for compact bidirectional protection circuits.

Technical Context

The BAT54A-QR integrates two independent Schottky diodes sharing a common anode terminal (Pin 3), enabling symmetrical clamping or dual-path protection without external interconnects. Its planar structure with guard ring ensures robust ESD and transient stress immunity.

It operates within −55 °C to 150 °C ambient range, supports pulsed forward currents up to 600 mA (non-repetitive), and delivers stable 5 ns trr performance under IF = 10 mA / IR = 10 mA test conditions-critical for USB, CAN, and LVDS signal integrity.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package with 3 terminals, 1.9 mm pitch, and FR4 PCB-compatible thermal resistance of 500 K/W (junction-to-ambient, free air).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSR0230P2T5G and SD103AW-TP, the BAT54A-QR uniquely delivers AEC-Q101-compliant dual-diode functionality in SOT23, enabling compact, validated automotive protection without sacrificing speed or leakage performance.

Availability

BAT54A-QR is available at Aetrix Electronics and suitable for automotive body electronics, USB interface protection, and industrial CAN bus nodes requiring stable component supply and full AEC-Q101 traceability.

Supply support for BAT54A-QR 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.

The BAT54A-QR belongs to Nexperia's AEC-Q101-qualified Schottky diode product line, engineered specifically for robust signal integrity and power rail protection in harsh automotive environments.

FAQ

Is BAT54A-QR pin-compatible with BAT54C or BAT54S?

No. BAT54A-QR has a common-anode configuration (Pin 3 = anode, Pins 1 & 2 = cathodes), whereas BAT54C is common-cathode and BAT54S is series-connected. Swapping them causes functional failure-e.g., reversed clamping direction or open circuit in protection paths.

What is the maximum continuous forward current for BAT54A-QR at 85 °C ambient?

At Tamb = 85 °C, the derated continuous forward current is 120 mA, calculated from the 200 mA rating at 25 °C using the 500 K/W Rth(j-a) and 150 °C Tj(max): (150 − 85) / 500 = 0.13 W → Ptot = 130 mW → IF ≈ 130 mW / 0.8 V ≈ 120 mA.

Does BAT54A-QR support wave soldering?

Yes. Nexperia provides dedicated wave soldering footprints (Fig. 7) with 1.4 mm pad width and 2.2 mm spacing. Recommended preheat ≤ 100 °C, wave contact time 3–5 s, and peak temperature ≤ 260 °C to avoid delamination or marking code degradation.

Can BAT54A-QR be used for 5 V logic-level clamping?

Yes. With VF ≤ 800 mV at 100 mA and IR ≤ 2 µA at 25 V, it clamps 5 V signals to ~3.3 V (VCC + VF) when anode is tied to 2.5 V rail-verified in Nexperia's AN11520 for I²C and SPI bus protection without signal distortion.