Taiwan Semiconductor Corporation S1MAL

Overview

S1MAL from Taiwan Semiconductor is a 1 A, 1000 V repetitive peak reverse voltage standard surface-mount rectifier diode in a Thin SMA package, featuring glass-passivated junction, 30 A surge current capability, and 150 °C maximum junction temperature - used in high-voltage DC-DC converters and switching inverters.

For engineers reviewing the S1MAL datasheet, S1MAL pinout, S1MAL application, or S1MAL equivalent, key selection factors include its 1000 V V_RRM, low forward voltage (0.96 V @ 1 A, 25 °C), thermal resistance (R_θJL = 29 °C/W), RoHS/halogen-free compliance, and suitability for automated SMT assembly in power conversion systems.

Technical Context

The S1MAL is a single-die, unidirectional silicon rectifier optimized for high-voltage, medium-current AC-to-DC and DC-DC conversion. Its glass-passivated junction ensures stable reverse leakage (<1 µA @ 25 °C, <50 µA @ 125 °C) and robust surge handling (100 A @ 1 ms).

Thermal performance is defined with reference to a 5 mm × 5 mm copper pad PCB mount: R_θJA = 82 °C/W, R_θJC = 30 °C/W, enabling reliable operation up to 150 °C junction temperature under continuous 1 A forward conduction.

Key Specifications

Pinout & Package

Package: Thin SMA - low-profile, surface-mount package with cathode band marking, pure tin-plated leads (J-STD-002 compliant), UL 94V-0 molding compound, and moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R06 and ES1J, the S1MAL uniquely delivers 1000 V blocking capability in the same Thin SMA footprint - essential for next-generation 800 V battery systems and ultra-wide-input industrial PSUs where voltage margin directly impacts system reliability and derating overhead.

Availability

S1MAL is available at Aetrix Electronics and suitable for high-voltage DC-DC converters, switching mode inverters, and general-purpose rectification requiring stable component supply across automotive-grade, industrial, and telecom power designs.

Supply support for S1MAL 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 power, automotive, and industrial markets since 1979.

The S1MAL belongs to TSC's S1xAL family of standard rectifiers - engineered for high-voltage, high-reliability surface-mount rectification in cost-sensitive yet thermally demanding power conversion applications.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S1MAL?

The S1MAL 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 B2103). This rating defines the highest reverse voltage the S1MAL can block repeatedly without breakdown under normal operating conditions and is critical for selecting appropriate safety margins in high-voltage power supply designs.

Does the S1MAL have a glass-passivated junction, and why does it matter?

Yes, the S1MAL features a glass-passivated chip junction, explicitly listed under FEATURES in the Taiwan Semiconductor documentation. This construction enhances long-term reliability by protecting the PN junction against moisture ingress, contamination, and mechanical stress - directly improving reverse leakage stability and preventing premature failure during thermal cycling or humid environments, especially in industrial-grade S1MAL deployments.

What is the forward voltage (V_F) of the S1MAL at 1 A and 25 °C?

The forward voltage (V_F) of the S1MAL is 0.96 V maximum at 1 A forward current and 25 °C junction temperature, per the Electrical Specifications table. This value reflects worst-case conduction loss under nominal conditions and is used to calculate power dissipation (P_cond ≈ I_F × V_F) - a key input for thermal design when using the S1MAL in continuous-duty rectifier applications.

Is the S1MAL RoHS and halogen-free compliant?

Yes, the S1MAL is RoHS compliant and halogen-free in accordance with IEC 61249-2-21, as stated in the FEATURES section of the official Taiwan Semiconductor datasheet. This compliance ensures the S1MAL meets environmental regulatory requirements for sale and use in the EU, China, and other major markets, and supports safer end-of-life recycling without release of hazardous halogenated compounds.

What is the thermal resistance from junction to lead (R_θJL) for the S1MAL?

The junction-to-lead thermal resistance (R_θJL) for the S1MAL is 29 °C/W, specified in the Thermal Performance section of the datasheet under test conditions using a 5 mm × 5 mm copper pad PCB mount. This parameter quantifies how effectively heat flows from the die to the soldered lead - enabling accurate junction temperature estimation (T_J = T_L + P_D × R_θJL) when designing thermal relief for the S1MAL in compact power layouts.