Taiwan Semiconductor Corporation S1DALH

Overview

S1DALH from Taiwan Semiconductor is a 1 A, 200 V standard surface-mount rectifier diode with glass-passivated junction, AEC-Q101 qualification, and Thin SMA package. It delivers 30 A surge current capability, 0.96 V max forward voltage at 1.0 A/25°C, and operates up to +150°C junction temperature. It is used in automotive freewheeling and DC/DC converter snubber circuits.

For engineers reviewing the S1DALH datasheet, S1DALH pinout, S1DALH application, or S1DALH equivalent, key selection factors include its 200 V repetitive peak reverse voltage, AEC-Q101 qualification for automotive use, Thin SMA low-profile footprint, 1 A average forward current rating, and 0.96 V forward voltage limit at rated load.

Technical Context

The S1DALH is a single-die, unidirectional silicon rectifier optimized for high-reliability surface-mount applications. Its glass-passivated junction ensures stable reverse leakage (<1 µA at 25°C) and robust thermal performance (R_θJL = 29°C/W).

Designed for automated placement and reflow soldering, it meets J-STD-020 moisture sensitivity level 1 and JESD 201 Class 2 whisker resistance. Polarity is marked by cathode band; terminals are matte tin-plated per J-STD-002.

Key Specifications

Pinout & Package

Package: Thin SMA - Low-profile surface-mount package with cathode-indicating band, matte tin-plated leads, UL 94V-0 molding compound, and 0.029 g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR120 and VS-1EWH02-M3, the S1DALH offers AEC-Q101 compliance in a low-profile Thin SMA package with balanced VF (0.96 V max) and proven reliability in automotive freewheeling roles - making it optimal where qualification, height, and surge robustness are jointly prioritized.

Availability

S1DALH is available at Aetrix Electronics and suitable for automotive freewheeling, DC/DC converter snubbing, and industrial LED driver clamp applications requiring stable component supply, AEC-Q101 assurance, and consistent Thin SMA packaging.

Supply support for S1DALH 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 global automotive, industrial, and consumer markets since 1979.

The S1DALH belongs to TSC's AEC-Q101-qualified Thin SMA rectifier family, engineered specifically for space-constrained, high-reliability automotive power conversion and clamping functions where thermal robustness and process consistency are critical.

FAQ

What is the maximum junction temperature rating for the S1DALH?

The S1DALH has a maximum junction temperature (T_J) rating of +150°C. This specification allows reliable operation in under-hood automotive environments and high-ambient industrial settings. Thermal design must ensure that actual die temperature - calculated using R_θJL = 29°C/W and measured lead temperature - remains below this limit during continuous 1 A conduction or 30 A surge events. The S1DALH datasheet confirms this value applies across its full operating range.

Is the S1DALH AEC-Q101 qualified, and what does that cover?

Yes, the S1DALH is AEC-Q101 qualified. This certification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, unbiased highly accelerated stress test (UHAST), and mechanical shock - all performed per AEC-Q101 Rev D. The qualification validates suitability for automotive powertrain and chassis applications. The S1DALH's glass-passivated junction and Thin SMA construction directly support this qualification, and the marking "B2103" on the device corresponds to the qualified version.

What is the forward voltage of the S1DALH at 1 A and 125°C?

The S1DALH exhibits a forward voltage of 0.85 V (typical) and 0.98 V (maximum) at 1.0 A and 125°C. This reduced V_F versus room temperature (0.96 V max at 25°C) reflects positive temperature coefficient behavior typical of silicon rectifiers. These values are measured under pulsed conditions (PW = 0.3 ms) and are critical for thermal modeling in high-temperature automotive applications where the S1DALH operates near its T_J limit.

Does the S1DALH have a defined polarity marking, and how is it identified?

Yes, the S1DALH uses a cathode band to indicate polarity - a white or silver band located at the cathode end of the Thin SMA package. This marking aligns with JEDEC standards and is visible under standard optical inspection. The anode is the unmarked end. Correct orientation is essential for proper reverse blocking (200 V) and forward conduction; misplacement would result in immediate failure under reverse bias. The S1DALH's marking diagram is documented in Version B2103 of its datasheet.

What is the surge current rating of the S1DALH, and under what conditions is it specified?

The S1DALH is rated for 30 A non-repetitive surge current (I_FSM) under an 8.3 ms half-sine waveform at T_A = 25°C. It also supports 100 A for 1.0 ms pulses. These ratings define safe transient energy absorption during inductive switch-off events - such as in fuel injector drivers or DC/DC converter snubbers. The S1DALH's glass-passivated junction and thermal design (R_θJL = 29°C/W) enable repeatable surge endurance without parametric shift, as verified in AEC-Q101 testing.