Diodes Incorporated ZHCS500TA

Overview

ZHCS500TA from Diodes Incorporated is a surface-mount Schottky barrier diode rated for 40 V reverse voltage, 500 mA continuous forward current, and 550 mV forward voltage at 500 mA, optimized for high-efficiency DC–DC converters in mobile telecom and PCMCIA applications.

For engineers reviewing the ZHCS500TA datasheet, ZHCS500TA pinout, ZHCS500TA application, or ZHCS500TA equivalent, key selection criteria include low VF at high IF, AEC-Q101 qualification, SOT23 package thermal performance, and IR ≤ 40 µA at 30 V reverse bias.

Technical Context

This Schottky diode uses a platinum-silicide or similar low-barrier metal-semiconductor junction to achieve fast switching (tRR ≤ 10 ns) and minimal forward conduction loss. Its 125 °C maximum junction temperature and 330 mW power dissipation support operation in thermally constrained portable power stages.

Designed for unidirectional power rectification in buck and boost topologies, it delivers stable performance across -55 °C to +150 °C storage range and exhibits 20 pF capacitance at 1 MHz/25 V, minimizing high-frequency switching noise coupling.

Key Specifications

Pinout & Package

Package: SOT23 - Surface-mount plastic case (2.4 mm × 1.3 mm × 0.915 mm), UL 94V-0 rated, moisture sensitivity level 1, matte tin-plated Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MBR0540T1G and SS34, ZHCS500TA offers the lowest combined VF/IR trade-off in SOT23, enabling higher efficiency in space-constrained mobile and automotive power supplies without layout change.

Availability

ZHCS500TA is available at Aetrix Electronics and suitable for DC–DC converters, mobile telecom power management, and PCMCIA interface protection requiring stable component supply and AEC-Q101 reliability assurance.

Supply support for ZHCS500TA 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions.

The ZHCS500TA belongs to Diodes' automotive-qualified Schottky rectifier product line, engineered specifically for high-efficiency, low-profile DC–DC conversion in thermally demanding portable and vehicle-mounted electronics.

FAQ

What is the maximum allowable peak forward surge current for ZHCS500TA?

The ZHCS500TA supports 6.75 A non-repetitive forward surge current for pulse widths ≤100 µs and 3 A for pulses ≤10 ms, per its Absolute Maximum Ratings table. These values assume TA = +25°C and are validated under standardized test conditions defined in JEDEC standards.

Is ZHCS500TA suitable for use in synchronous rectifier circuits?

Yes - ZHCS500TA's 10 ns reverse recovery time and low VF make it suitable as a self-driven or controller-assisted synchronous rectifier in DC–DC converters up to 3 MHz. Its SOT23 package allows placement adjacent to MOSFETs with minimal parasitic inductance.

Does ZHCS500TA require derating at elevated ambient temperatures?

Yes - at TA = +100°C, VF rises to 440 mV at 500 mA, and maximum continuous IF must be reduced to maintain TJ ≤ 125°C. Derating curves in Figure 1 of DS33216 show IF drops to ~320 mA at +100°C ambient with standard PCB mounting.

How is the "NC" pin (Pin 2) handled in PCB layout and thermal design?

Pin 2 is internally unconnected and serves only as a mechanical anchor. It must remain electrically floating - no trace routing or thermal pad connection is permitted. Including it in a thermal pad would violate JEDEC SOT23 mechanical specifications and risk solder wicking or voiding.