Taiwan Semiconductor Corporation S1MLSH

Overview

S1MLSH from Taiwan Semiconductor is a 1000V, 1.2A standard surface-mount silicon rectifier diode in SOD-123HE package, rated for 50A non-repetitive surge current and 175°C maximum junction temperature, used in automotive DC-DC converters and snubber circuits.

For engineers reviewing the S1MLSH datasheet, S1MLSH pinout, S1MLSH application, or S1MLSH equivalent, key selection criteria include peak reverse voltage (1000V), forward current rating (1.2A), thermal resistance (R_θJA = 86°C/W), AEC-Q101 qualification, and SOD-123HE compact footprint compatibility with automated placement.

Technical Context

The S1MLSH is a single-die, unidirectional standard rectifier optimized for high-voltage, medium-current switching applications. Its 1000V V_RRM and 50A I_FSM support robust transient handling in automotive power supplies, while the SOD-123HE package enables low-profile PCB integration with J-STD-002 solderability.

Thermal performance is defined by R_θJA = 86°C/W on a 5mm × 5mm Cu pad, and R_θJL = 46°C/W to lead - critical for thermal design in space-constrained automotive lighting and DC-DC modules where junction temperature must stay ≤175°C under continuous 1.2A load.

Key Specifications

Pinout & Package

Package: SOD-123HE - surface-mount, molded plastic case with matte tin-plated leads, UL 94V-0 rated, polarity indicated by cathode band, weight ≈0.022g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1L06S and MUR120E, the S1MLSH uniquely delivers 1000V blocking capability in a compact SOD-123HE package with AEC-Q101 qualification - making it the only option among the three suitable for automotive 48V DC-DC input rectification and high-voltage snubbers without layout or thermal redesign.

Availability

S1MLSH is available at Aetrix Electronics and suitable for automotive DC-DC converters, LED car lighting drivers, and industrial snubber circuits requiring stable component supply with AEC-Q101 reliability and 1000V voltage margin.

Supply support for S1MLSH 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 S1MLSH belongs to TSC's S1xLSH standard rectifier family, engineered specifically for AEC-Q101-compliant, high-voltage surface-mount rectification in space-constrained automotive power systems and industrial DC supplies.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) of the S1MLSH?

The S1MLSH has a maximum repetitive peak reverse voltage (V_RRM) of 1000 V, as confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version A2103). This rating defines its ability to block reverse voltage continuously without breakdown and is the key differentiator from lower-voltage variants like S1DLSH (200V) or S1KLSH (800V). The S1MLSH must be selected when system transients or operating voltages exceed 800V.

Is the S1MLSH qualified for automotive applications?

Yes, the S1MLSH is explicitly AEC-Q101 qualified per the manufacturer's documentation, confirming its suitability for automotive applications including under-hood power conversion and lighting. This qualification covers stress tests such as temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge. The S1MLSH's 175°C maximum junction temperature and moisture sensitivity level 1 further support robust automotive deployment without special handling.

What package type does the S1MLSH use, and what are its mechanical features?

The S1MLSH uses the SOD-123HE surface-mount package: a compact, molded plastic case with matte tin-plated leads solderable per J-STD-002, UL 94V-0 flammability rating, and cathode polarity indicated by a visible band. Its approximate weight is 0.022 g. The SOD-123HE footprint supports automated placement and provides improved thermal performance over standard SOD-123 due to enhanced leadframe design, as reflected in its R_θJL = 46°C/W specification.

What is the forward voltage (V_F) of the S1MLSH at rated current?

The forward voltage (V_F) of the S1MLSH is guaranteed ≤1.3 V at I_F = 1.2 A and T_J = 25°C, per the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) to avoid self-heating effects. At elevated junction temperatures (e.g., 125°C), V_F decreases slightly, but system-level conduction loss calculations should use the 1.3 V max value for worst-case thermal design of the S1MLSH.

Does the S1MLSH have halogen-free and RoHS compliance certifications?

Yes, the S1MLSH is both halogen-free per IEC 61249-2-21 and RoHS compliant per EU Directive 2011/65/EU, as stated in the Features section of the official Taiwan Semiconductor datasheet. These certifications are verified through material declarations and third-party testing, ensuring alignment with environmental regulations for automotive and industrial end equipment. No exemptions apply - full substance restrictions are met for all six RoHS substances.