Taiwan Semiconductor Corporation S2MALH

Overview

S2MALH from Taiwan Semiconductor is a 1000 V, 2 A standard surface-mount rectifier diode in Thin SMA package, featuring glass passivated junction, AEC-Q101 qualification, and 50 A surge capability; used in automotive freewheeling and DC/DC converter snubber circuits.

For engineers reviewing the S2MALH datasheet, S2MALH pinout, S2MALH application, or S2MALH equivalent, key selection criteria include peak reverse voltage (1000 V), forward voltage at 2 A (≤1.10 V @ 25°C), thermal resistance (R_θJA = 74 °C/W), AEC-Q101 qualification, and Thin SMA package compatibility with automated placement.

Technical Context

This single-die standard rectifier operates with unidirectional conduction and is optimized for high-voltage, medium-current switching applications. Its glass passivated junction ensures stable reverse leakage (<1 µA @ 25°C, <33 µA @ 125°C) and robustness against moisture and mechanical stress.

The device exhibits low forward voltage drop (0.98 V typ. @ 2 A, 25°C) and moderate junction capacitance (12 pF @ 1 MHz, 4 V), supporting efficient operation in 50–100 kHz DC/DC converters and snubber networks where fast recovery is not required.

Key Specifications

Pinout & Package

Package: Thin SMA - surface-mount, low-profile (max height 2.2 mm), matte tin-plated leads, polarity indicated by cathode band, UL 94V-0 molding compound, MSL Level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R06 and SB2100, the S2MALH uniquely combines AEC-Q101 qualification, 1000 V rating, and Thin SMA packaging-enabling automotive SMT designs without trade-offs in voltage margin or reliability validation.

Availability

S2MALH is available at Aetrix Electronics and suitable for automotive freewheeling, DC/DC converter snubbing, and industrial high-voltage clamp applications requiring stable component supply and long-term BOM continuity.

Supply support for S2MALH 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 S2MALH belongs to TSC's AEC-Q101-qualified Thin SMA rectifier family, engineered specifically for space-constrained, high-reliability automotive power conversion and industrial clamp circuits where voltage margin and thermal performance are critical.

FAQ

What is the peak repetitive reverse voltage rating of the S2MALH?

The S2MALH has a peak repetitive reverse voltage (V_RRM) rating of 1000 V. This value is confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version B2103). It defines the maximum reverse-biased voltage the S2MALH can block repeatedly without breakdown, making it suitable for high-voltage applications such as 800 VAC rectification and automotive 48 V system clamping. The S2MALH is the highest-voltage variant in the S2xALH series.

Is the S2MALH qualified for automotive applications?

Yes, the S2MALH is AEC-Q101 qualified, as explicitly stated in the FEATURES section of the Taiwan Semiconductor datasheet. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and unbiased highly accelerated stress test (UHAST), confirming its suitability for under-hood and powertrain-related automotive systems. The S2MALH's -55 °C to +150 °C operating range and glass passivated junction further support this automotive-grade reliability.

What is the forward voltage of the S2MALH at 2 A and 25°C?

The forward voltage (V_F) of the S2MALH is specified as a maximum of 1.10 V at 2 A and 25°C, with a typical value of 0.98 V. This parameter is listed in the ELECTRICAL SPECIFICATIONS table under "IF = 2A, TJ = 25°C". It directly determines conduction losses in rectifier applications and is measured using a pulse test (PW = 0.3 ms). At elevated temperature (125°C), V_F drops to ≤0.98 V, reflecting the negative temperature coefficient of silicon PN junctions.

What package type does the S2MALH use, and what are its key mechanical attributes?

The S2MALH uses the Thin SMA package, a surface-mount variant of the SMA outline with reduced height (≤2.2 mm). Key mechanical attributes include matte tin-plated leads (solderable per J-STD-002), UL 94V-0 flammability-rated molding compound, cathode polarity indicated by a band, and moisture sensitivity level (MSL) 1 per J-STD-020. Its weight is approximately 0.029 g, and it meets JESD201 Class 2 whisker resistance requirements.

Does the S2MALH have a specified junction-to-ambient thermal resistance?

Yes, the S2MALH has a junction-to-ambient thermal resistance (R_θJA) of 74 °C/W, measured on a standard 5 mm × 5 mm copper pad PCB per JEDEC test conditions. This value appears in the THERMAL PERFORMANCE table and is essential for calculating allowable power dissipation in real-world layouts. For higher-power operation, thermal relief pads or additional copper area may be needed to approach the lower R_θJC (20 °C/W) or R_θJL (14 °C/W) limits.