Taiwan Semiconductor Corporation S1M-T

Overview

S1M-T from Taiwan Semiconductor is a 1 A, 1000 V repetitive peak reverse voltage (V_RRM) standard surface-mount silicon rectifier diode in DO-214AC (SMA) package, featuring 1.1 V max forward voltage at 1 A and 50 µA max reverse leakage at 125°C, used in DC-DC converters and switching-mode inverters.

For engineers reviewing the S1M-T datasheet, S1M-T pinout, S1M-T application, or S1M-T equivalent, key selection criteria include its 1000 V V_RRM, 40 A I_FSM surge rating, glass-passivated junction, J-STD-020 Level 1 moisture sensitivity, and RoHS/halogen-free compliance for high-reliability power conversion designs.

Technical Context

The S1M-T is a single-die, unidirectional standard recovery rectifier optimized for general-purpose AC/DC and DC/DC power conversion where moderate switching speed and high surge tolerance are prioritized over ultrafast recovery. Its 1500 ns reverse recovery time (t_rr) and 12 pF junction capacitance reflect trade-offs favoring ruggedness and thermal stability over high-frequency operation.

Thermally, it delivers R_θJL = 30°C/W and R_θJA = 85°C/W, enabling 1 A continuous conduction with appropriate PCB copper area. The DO-214AC (SMA) package supports automated placement and meets UL 94V-0 flammability and JESD 201 Class 1A whisker resistance requirements.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration. Cathode indicated by band on body. Matte tin-plated leads, solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R06 and MUR110, the S1M-T offers the highest surge rating (40 A) and surface-mount compatibility in a cost-effective SMA package, making it optimal for high-volume, automated production of 1000 V-rated power supplies where standard recovery speed is sufficient.

Availability

S1M-T is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and industrial AC/DC adapters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for S1M-T 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, specializing in power rectifiers, TVS diodes, MOSFETs, and LED drivers.

The S1M-T belongs to TSC's S1x-T family of standard recovery surface-mount rectifiers, designed specifically for cost-sensitive, high-volume AC/DC and DC/DC power conversion applications demanding reliability, manufacturability, and regulatory compliance.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S1M-T?

The S1M-T has a maximum repetitive peak reverse voltage (V_RRM) of 1000 V, as confirmed in the Absolute Maximum Ratings table. This rating defines the highest reverse voltage the diode can block continuously without breakdown and is the defining parameter distinguishing S1M-T from lower-voltage variants like S1K-T (800 V) or S1J-T (600 V). Designers must ensure this rating exceeds peak inverse voltage in their circuit by ≥20% margin.

Does the S1M-T have a specified reverse recovery time (t_rr)?

Yes, the S1M-T has a typical reverse recovery time (t_rr) of 1500 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions. This value is consistent across the S1D-T to S1M-T family and reflects its classification as a standard (not ultrafast) recovery rectifier. The S1M-T datasheet explicitly lists t_rr = 1500 ns in the Electrical Specifications table.

What package type does the S1M-T use, and is it compatible with automated assembly?

The S1M-T uses the DO-214AC (SMA) surface-mount package, which is fully compatible with automated pick-and-place equipment. The datasheet confirms "Ideal for automated placement" under Features and specifies matte tin-plated leads solderable per J-STD-002. Its moisture sensitivity level is J-STD-020 Level 1, meaning no pre-baking is required before reflow soldering.

What is the forward voltage (V_F) of the S1M-T at rated current?

The S1M-T has a maximum forward voltage (V_F) of 1.1 V at 1 A forward current and 25°C junction temperature, as stated in the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) and represents worst-case conduction loss. At higher temperatures or lower currents, V_F decreases slightly, but system thermal design must assume the 1.1 V maximum for worst-case power dissipation calculations.

Is the S1M-T compliant with RoHS and halogen-free standards?

Yes, the S1M-T is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the Features section of the datasheet. These compliance statements apply to the entire S1D-T to S1M-T family, including the S1M-T, and are verified through material declarations and third-party testing. No exemptions are claimed; the device meets full RoHS Directive 2011/65/EU requirements.