Taiwan Semiconductor Corporation S4J

Overview

S4J from Taiwan Semiconductor is a 4A, 600V surface-mount silicon rectifier diode in DO-214AB (SMC) package, featuring glass-passivated junction, low forward voltage drop (max 1.15 V at 4 A), high surge capability (100 A, 8.3 ms), and operation up to 150°C junction temperature - used in AC/DC front-end rectification for industrial SMPS and lighting converters.

For engineers reviewing the S4J datasheet, S4J pinout, S4J application, or S4J equivalent, key selection criteria include repetitive peak reverse voltage (600 V), thermal resistance (R_θJL = 13 °C/W), reverse recovery time (1500 ns), moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance per IEC 61249-2-21.

Technical Context

The S4J is a single-die, standard-recovery silicon rectifier optimized for cost-sensitive, medium-voltage switching power supplies. Its 600 V V_RRM, 4 A average forward current, and 100 A non-repetitive surge rating support robust line-input rectification under transient overload conditions.

Thermal performance is defined by R_θJL = 13 °C/W and R_θJA = 47 °C/W, with junction-to-ambient derating starting at 25°C. Reverse recovery time of 1500 ns reflects standard recovery behavior suitable for <100 kHz operation, not fast- or ultrafast-switching topologies.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount, single-anode/single-cathode configuration. Cathode indicated by molded band on body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH4L06S, the S4J delivers lower conduction loss and simpler thermal management at the expense of higher EMI in fast-switching circuits; versus ES4J, it provides identical performance with alternate supply-chain assurance.

Availability

S4J is available at Aetrix Electronics and suitable for industrial SMPS, LED lighting drivers, AC-DC adapters, and DC-DC converter input protection requiring stable component supply across multi-year production cycles.

Supply support for S4J 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 electronics and industrial markets since 1979.

The S4J belongs to TSC's S4x family of general-purpose surface-mount rectifiers, designed specifically for reliable, cost-optimized AC/DC front-end rectification in high-volume industrial and lighting applications.

FAQ

What is the maximum junction temperature rating for the S4J?

The S4J has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table. This allows operation in high-ambient environments such as enclosed LED drivers or industrial power supplies. Derating curves confirm usable current capacity down to 0 A at 150°C case temperature. The S4J must be mounted on adequate copper area to maintain T_J ≤ 150°C under full load.

Does the S4J support lead-free reflow soldering?

Yes, the S4J features matte tin-plated leads compliant with J-STD-002 solderability requirements and qualified for standard lead-free reflow profiles (peak temperature up to 260°C). Its MSL Level 1 rating means no dry-pack or baking is required prior to assembly. The S4J is fully compatible with automated SMT lines processing RoHS-compliant boards.

What is the reverse recovery time (t_rr) of the S4J and how does it affect circuit design?

The S4J has a typical reverse recovery time of 1500 ns under specified test conditions (I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A). This standard-recovery characteristic makes it appropriate for line-frequency and low-to-moderate switching frequency applications (<100 kHz), but unsuitable for high-frequency synchronous rectification. Designers using the S4J should account for associated switching losses and potential EMI in the input filter stage.

Is the S4J pin-compatible with other devices in the S4x series?

Yes, all S4x devices (S4A through S4M) share identical DO-214AB (SMC) package dimensions, pinout, and thermal pad layout. The S4J uses the same anode/cathode terminal configuration and mounting footprint as S4A, S4B, etc., enabling voltage-rating flexibility within the same PCB design. Only the marked voltage rating and corresponding electrical parameters differ between variants.

How does the S4J compare to fast recovery diodes in terms of forward voltage and thermal performance?

The S4J offers lower forward voltage (≤1.15 V @ 4 A) than most fast recovery diodes (e.g., STTH4L06S at 1.7 V), reducing conduction loss and easing thermal design. However, its 1500 ns t_rr results in higher switching loss at high frequencies. For thermally constrained, low-frequency applications, the S4J delivers superior efficiency; for high-frequency PFC, a fast-recovery alternative is preferred. The S4J remains optimal where thermal margin is tighter than EMI margin.