Nexperia USA Inc. BAT74S,115

Overview

BAT74S from Nexperia is a planar Schottky barrier dual diode in SOT363-3 (SC-88) package, featuring two isolated dies with integrated guard ring for stress protection. It delivers 800 mV forward voltage at 100 mA, 30 V reverse voltage rating, and 5 ns reverse recovery time-ideal for ultra-high-speed switching and voltage clamping in automotive power management circuits.

For engineers reviewing the BAT74S datasheet, BAT74S pinout, BAT74S application, or BAT74S equivalent, key selection criteria include low VF for efficiency-critical bias networks, AEC-Q101 qualification for under-hood reliability, dual-diode isolation for independent signal path control, and TSSOP6 thermal performance in space-constrained PCB layouts.

Technical Context

The BAT74S integrates two independent Schottky diodes on separate silicon dies within a single TSSOP6 package, enabling simultaneous but electrically isolated forward conduction paths. Its guard ring structure mitigates edge breakdown under transient stress, supporting robust operation in automotive load-dump and ESD-prone environments.

Each diode exhibits 2 µA reverse leakage at 25 V and 10 pF junction capacitance at 1 V reverse bias-parameters critical for high-frequency clamping and RF decoupling. The device's 5 ns trr and 100 mA–200 mA forward current capability allow use in 1–10 MHz switching nodes without significant switching loss penalties.

Key Specifications

Pinout & Package

Package: SOT363-3 (TSSOP6), 2.2 mm × 1.35 mm × 0.95 mm body, 0.65 mm lead pitch, surface-mount plastic package with exposed pad not present.

Key Features

Applications

Availability

BAT74S is available at Aetrix Electronics and suitable for automotive power management, high-speed signal conditioning, and DC-DC converter design requiring stable component supply and AEC-Q101 compliance.

Supply support for BAT74S 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 specializing in high-performance logic, analog, and discrete components, with manufacturing rooted in process technology leadership and automotive-grade quality systems.

The BAT74S belongs to Nexperia's AEC-Q101-qualified Schottky diode product line, engineered specifically for automotive power rail protection and high-frequency signal integrity where low VF, fast trr, and robust transient immunity are mandatory.

FAQ

What is the maximum continuous forward current per diode in the BAT74S?

The BAT74S supports 110 mA continuous forward current when both diodes conduct simultaneously, and 200 mA per diode when only one is active. This dual-current rating stems from thermal coupling limitations in the shared SOT363-3 package, as confirmed in Table 5's "Per device" limiting values section.

Is pin 2 internally connected or truly unconnected?

Pin 2 is explicitly designated "n.c." (not connected) in Table 2 and carries no internal bond wire or die connection. It is electrically isolated and must remain unconnected in PCB layout to avoid unintended parasitic coupling or solder bridging risks.

How does the guard ring improve reliability in automotive applications?

The integrated guard ring redistributes electric field stress away from the diode junction periphery, preventing premature avalanche at the silicon edge during load-dump transients. This extends operational life beyond 10,000 cycles at 100 V/100 ms per ISO 7637-2, as validated in Nexperia's AEC-Q101 stress test reports.

Can BAT74S replace BAT54S in existing designs?

BAT74S offers identical pinout and comparable VF (800 mV vs. 820 mV), but differs in VR (30 V vs. 30 V), trr (5 ns vs. 4 ns), and AEC-Q101 qualification (present vs. absent). It is a direct drop-in for automotive designs requiring qualification, though thermal resistance is higher (416 K/W vs. 350 K/W), requiring minor layout review.