Taiwan Semiconductor Corporation HS1DALH

Overview

HS1DALH from Taiwan Semiconductor is a 1 A, 200 V high-efficiency surface-mount rectifier diode with glass-passivated junction, low forward voltage (0.85 V at 1.0 A, 25°C), 50 ns reverse recovery time, and Thin SMA package. It serves as a freewheeling or snubber diode in automotive DC/DC converters requiring AEC-Q101 qualification and robust thermal performance.

For engineers reviewing the HS1DALH datasheet, HS1DALH pinout, HS1DALH application, or HS1DALH equivalent, key selection criteria include its 200 V repetitive peak reverse voltage, 35 A surge rating, 150°C maximum junction temperature, J-STD-020 Level 1 moisture sensitivity, and RoHS/halogen-free compliance for automotive-grade power conversion designs.

Technical Context

The HS1DALH is a single-die, unidirectional silicon rectifier optimized for fast switching and low conduction loss. Its glass-passivated junction ensures stable reverse leakage (<1 µA at 25°C) and reliable operation up to 150°C junction temperature.

Thermal design is supported by verified junction-to-lead resistance of 29°C/W and junction-to-ambient resistance of 51°C/W on a 5 mm × 5 mm copper pad. The device uses a cathode-band polarity indicator and matte tin-plated leads compliant with J-STD-002 solderability standards.

Key Specifications

Pinout & Package

Package: Thin SMA - low-profile, surface-mount package with 2.7 mm height, UL 94V-0 molding compound, and JESD 201 Class 2 whisker-resistant matte tin leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-efficiency rectifier applications.

Compared with MUR120 and VS-1EWH02-M3, the HS1DALH delivers the lowest VF (0.85 V) in Thin SMA at 200 V, balancing efficiency and thermal performance without compromising AEC-Q101 compliance or manufacturability.

Availability

HS1DALH is available at Aetrix Electronics and suitable for automotive DC/DC converters, freewheeling circuits in SMPS, and snubber networks requiring stable component supply and AEC-Q101 qualification.

Supply support for HS1DALH 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving automotive, industrial, and consumer markets since 1979.

The HS1DALH belongs to TSC's HS1xALH high-efficiency rectifier family, designed specifically for AEC-Q101-compliant automotive power conversion where low VF, fast trr, and thin-profile packaging are essential.

FAQ

What is the maximum junction temperature rating for HS1DALH?

The HS1DALH has a maximum junction temperature (TJ MAX) of +150°C, validated per AEC-Q101 stress testing requirements. This rating allows continuous operation in under-hood automotive environments and high-temperature industrial power supplies. Thermal derating begins above 25°C ambient, with full 1 A current supported up to ~110°C case temperature based on its 51°C/W RθJA. The HS1DALH must be mounted on a minimum 5 mm × 5 mm copper pad to achieve published thermal performance.

Is HS1DALH suitable for automotive applications?

Yes, HS1DALH is AEC-Q101 qualified and explicitly designed for automotive use. It meets requirements for temperature cycling, high-temperature reverse bias, and mechanical shock. Its 200 V VRRM provides margin against load dump transients in 12 V systems, and its glass-passivated junction ensures long-term reliability in humid, vibration-prone environments. The HS1DALH is commonly deployed in automotive DC/DC converters, body control modules, and lighting drivers.

What does the "ALH" suffix indicate in HS1DALH?

The "ALH" suffix in HS1DALH denotes Taiwan Semiconductor's standardized Thin SMA package variant with matte tin-plated leads, J-STD-020 Level 1 moisture sensitivity, and halogen-free molding compound. It distinguishes this version from older SMA or DO-214AC variants and confirms compliance with automotive-grade assembly and environmental standards. All HS1xALH parts-including HS1DALH-share identical mechanical dimensions, marking format, and tape-and-reel packing (14,000 units per reel).

How does HS1DALH compare to HS1GALH in forward voltage?

At 1.0 A and 25°C, HS1DALH has a maximum forward voltage (VF) of 1.00 V and typical value of 0.85 V, while HS1GALH (400 V) has a max VF of 1.30 V and typical of 0.91 V. The lower VF of HS1DALH reflects its optimized 200 V junction design, delivering ~0.06 V lower typical drop than HS1GALH under identical conditions. This difference directly reduces conduction loss in low-voltage automotive rails where HS1DALH is typically selected.

What is the reverse recovery time (trr) specification for HS1DALH?

The HS1DALH has a reverse recovery time (trr) of 50 ns maximum, measured at IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A. This fast recovery enables efficient operation in high-frequency switching power supplies (e.g., >300 kHz buck converters), minimizing switching losses and EMI generation. The 50 ns trr is confirmed across temperature (25°C to 125°C) and is significantly faster than general-purpose rectifiers like 1N4007 (2000 ns), making HS1DALH suitable for demanding automotive SMPS designs.