Diodes Incorporated ZHCS400TA

Overview

ZHCS400TA from Diodes Incorporated is a 40 V, 400 mA surface-mount Schottky barrier diode in SOD323 package, featuring 500 mV max forward voltage at 400 mA, 40 µA max reverse leakage at 30 V, and thermal rating to +150°C - deployed in DC-DC converters for mobile telecoms and PCMCIA interfaces where low-loss rectification at elevated temperatures is critical.

For engineers reviewing the ZHCS400TA datasheet, ZHCS400TA pinout, ZHCS400TA application, or ZHCS400TA equivalent, key selection criteria include VF vs. temperature stability, IR at 30 V, junction-to-ambient thermal resistance (500 °C/W), and JEDEC-qualified reliability for high-temp industrial and automotive-adjacent power stages.

Technical Context

This Schottky diode uses a planar metal-semiconductor junction optimized for low forward conduction loss and minimal reverse recovery charge. Its 40 V reverse blocking capability supports 12–24 V input DC-DC topologies, while the 500 mV VF at 400 mA enables >92% efficiency in buck converter outputs operating above +85°C ambient.

The SOD323 package delivers 0.004 g mass and 500 °C/W RθJA on 1-inch² 2 oz copper, enabling compact layout without forced airflow. JEDEC qualification per AEC-Q standards confirms robustness under thermal cycling and humidity exposure typical of embedded power modules.

Key Specifications

Pinout & Package

SOD323 is a two-terminal surface-mount package with anode and cathode marked by a band on the cathode end. The device has no internal leads; terminals are matte tin-plated for solderability per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RB520S-30T1G and SBM140, ZHCS400TA uniquely balances 40 V rating, 400 mA continuous current, and 500 mV VF in the ultra-compact SOD323 - making it optimal for space-constrained, thermally demanding DC-DC outputs where leakage and efficiency trade-offs are tightly coupled.

Availability

ZHCS400TA is available at Aetrix Electronics and suitable for DC-DC converters, mobile telecom power supplies, and PCMCIA interface protection requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for ZHCS400TA 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-efficiency power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

ZHCS400TA belongs to the ZHCS series of low-VF Schottky diodes engineered specifically for high-temperature, high-efficiency rectification in compact portable and embedded power systems.

FAQ

What is the maximum allowable junction temperature for ZHCS400TA?

The absolute maximum junction temperature (T_J) is +125°C, as specified in the Electrical Characteristics table. Operation beyond this limit risks irreversible degradation of the Schottky barrier and accelerated parametric drift. Thermal design must ensure power dissipation stays within limits defined by R_θJA = 500 °C/W and ambient conditions.

Is ZHCS400TA suitable for automotive applications?

ZHCS400TA is not automotive-qualified; however, its JEDEC qualification aligns with baseline reliability requirements. For automotive use, Diodes offers the ZHCS400Q variant - a separate part qualified to AEC-Q101 with enhanced testing for temperature cycling, humidity, and mechanical shock.

How does the 500 mV V_F specification scale with temperature?

V_F decreases by approximately −1.8 mV/°C as junction temperature rises. At +100°C, V_F drops to ~440 mV at 400 mA - improving conduction efficiency but requiring verification of thermal runaway margins in constant-current applications.

Can ZHCS400TA replace a standard silicon diode in an existing design?

Yes, provided the 40 V reverse rating meets system requirements and PCB layout accommodates the SOD323 footprint. The lower V_F reduces heat generation, but designers must verify that reduced reverse recovery time does not induce ringing in inductive switching nodes without added snubbing.