Taiwan Semiconductor Corporation S3M

Overview

S3M from Taiwan Semiconductor is a 3A, 1000V surface-mount silicon rectifier diode in DO-214AB (SMC) package, featuring glass-passivated junction, low forward voltage drop (1.15 V max at 3 A), high surge capability (100 A @ 8.3 ms), and 150°C maximum junction temperature. It serves as the primary output rectifier in high-voltage AC/DC converters and offline SMPS.

For engineers reviewing the S3M datasheet, S3M pinout, S3M application, or S3M equivalent, key selection criteria include peak reverse voltage rating (1000 V), thermal resistance (13 °C/W junction-to-lead), reverse recovery time (1500 ns), moisture sensitivity level (J-STD-020 Level 1), and RoHS/halogen-free compliance for industrial power designs.

Technical Context

The S3M is a single-die, standard-recovery silicon rectifier optimized for high-voltage, medium-current switching applications. Its 1000 V V_RRM, 3 A average forward current, and 100 A non-repetitive surge rating support robust operation in flyback and forward converter outputs where voltage margin and thermal stability are critical.

Electrical behavior is defined by a typical junction capacitance of 60 pF at 4 V reverse bias and reverse leakage of ≤10 µA at 25°C - enabling predictable EMI filtering and minimal standby loss. The device uses matte tin-plated leads compliant with J-STD-002 and meets JESD201 Class 2 whisker resistance.

Key Specifications

Pinout & Package

DO-214AB (SMC) surface-mount package with cathode-indicated band; molded plastic body per JEDEC DO-214AB, UL 94V-0 rated, 0.210 g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH3L06S and VS-3EYH02-M3, the S3M uniquely balances 1000 V rating, 1.15 V forward drop, and DO-214AB compatibility - making it optimal for cost-sensitive, thermally constrained 1000 V rectification where ultrafast recovery is unnecessary.

Availability

S3M is available at Aetrix Electronics and suitable for high-voltage AC/DC adapters, industrial LED drivers, and offline switch-mode power supplies requiring stable component supply, long-lifecycle sourcing, and J-STD-020 Level 1 moisture handling.

Supply support for S3M 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 S3M belongs to TSC's S3x series of surface-mount rectifiers designed specifically for high-reliability, high-voltage power conversion in space-constrained industrial and lighting applications.

FAQ

What is the maximum junction temperature rating for the S3M?

The S3M has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table in TSC's O2301 datasheet. This allows the S3M to operate reliably in enclosed LED driver housings or high-ambient industrial power supplies without active cooling, provided PCB thermal design maintains junction-to-lead resistance at or below 13 °C/W.

Does the S3M have a specified reverse recovery time, and how does it affect circuit performance?

Yes, the S3M has a reverse recovery time (t_rr) of 1500 ns, measured at I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This value indicates standard recovery behavior, making the S3M appropriate for converters switching below 100 kHz but unsuitable for high-frequency synchronous rectification where t_rr < 100 ns is required. Designers using the S3M should include snubbers in flyback outputs to manage associated switching losses.

Is the S3M RoHS and halogen-free compliant?

Yes, the S3M is fully RoHS compliant and halogen-free, as confirmed in the "Features" section of TSC's official documentation (Version O2301). This compliance ensures the S3M meets IPC-1752A material declaration requirements and qualifies for use in consumer, industrial, and medical-grade equipment sold in EU, Japan, and China markets without restriction.

What is the marking code and polarity indication for the S3M?

The S3M is marked with "S3M" on its molded body, with polarity indicated by a distinct cathode band near one lead end. Per JEDEC DO-214AB mechanical drawings, the banded end is the cathode terminal, and the unmarked end is the anode. This marking aligns with industry-standard SMC package conventions and supports automated optical inspection (AOI) during SMT assembly.

What packaging and moisture sensitivity level does the S3M use?

The S3M is supplied in DO-214AB (SMC) package and shipped in tape-and-reel format - 3,000 units per reel. Its moisture sensitivity level is J-STD-020 Level 1, meaning it may be stored indefinitely at ≤30°C/60% RH without baking prior to reflow. This eliminates pre-bake steps in standard SMT lines and reduces manufacturing overhead for high-volume adapter production.