Taiwan Semiconductor Corporation S2JA

Overview

S2JA from Taiwan Semiconductor is a 600V, 1.5A surface-mount general-purpose rectifier diode in DO-214AC (SMA) package, featuring low forward voltage drop (≤1.1V at 1.5A), high surge current capability (50A), and 150°C maximum junction temperature - used in DC-DC converters and snubber circuits.

For engineers reviewing the S2JA datasheet, S2JA pinout, S2JA application, or S2JA equivalent, key selection criteria include repetitive peak reverse voltage (600V), forward current rating (1.5A), thermal resistance (R_θJL = 16°C/W), reverse recovery time (1500ns), and moisture sensitivity level (J-STD-020 Level 1).

Technical Context

The S2JA is a single-die, glass-passivated silicon PN junction rectifier optimized for switching-mode power supplies. Its 600V V_RRM and 50A I_FSM support robust transient handling in flyback and forward converter topologies.

With R_θJA = 53°C/W and R_θJL = 16°C/W, the S2JA enables efficient heat dissipation through PCB copper and lead conduction. Its 1500ns reverse recovery time and 30pF junction capacitance reflect standard recovery characteristics suitable for <100kHz operation.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, cathode indicated by band, matte tin-plated leads, UL 94V-0 molding compound, 0.060g typical weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1L06U and ES1J, the S2JA provides higher continuous current (1.5A vs. 1A) and greater surge resilience (50A vs. ~30A), making it preferable for cost-sensitive, thermally stable 50–100kHz rectifier applications where ultrafast recovery is unnecessary.

Availability

S2JA is available at Aetrix Electronics and suitable for DC–DC converters, snubber networks, lighting ballasts, and general-purpose AC/DC input rectification requiring stable component supply and J-STD-020 Level 1 handling.

Supply support for S2JA 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 industrial, computing, and consumer markets since 1979.

The S2JA belongs to TSC's S2x series of surface-mount rectifiers designed specifically for cost-effective, high-reliability power conversion in space-constrained and thermally demanding environments.

FAQ

What is the maximum repetitive peak reverse voltage rating for S2JA?

The S2JA has a maximum repetitive peak reverse voltage (V_RRM) of 600 V, as specified in the absolute maximum ratings table. This value is confirmed across all official documentation versions (K2102) and defines the highest reverse-biased voltage the device can withstand repeatedly without breakdown. Operating above this voltage risks irreversible junction failure. The S2JA must be selected with appropriate derating margins in circuits subject to voltage transients or ringing.

Does S2JA have a defined reverse recovery time, and how is it measured?

Yes, the S2JA has a typical reverse recovery time (t_rr) of 1500 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This parameter is explicitly listed in the Electrical Specifications table and reflects its standard recovery behavior. It is not an ultrafast or soft-recovery diode, so designers should account for associated switching losses and potential EMI in circuits operating above ~50 kHz.

What package type does S2JA use, and are its leads lead-free?

The S2JA uses the DO-214AC (SMA) surface-mount package with matte tin-plated leads that are solderable per J-STD-002. It is RoHS compliant and halogen-free per IEC 61249-2-21, confirming lead-free construction. The package features a cathode band marking, UL 94V-0 molding compound, and J-STD-020 Level 1 moisture sensitivity - enabling direct reflow without baking.

Can S2JA replace S2KA in a design, and what is the key difference?

No, the S2JA cannot directly replace S2KA without circuit review: S2JA is rated for 600 V V_RRM, while S2KA is rated for 800 V. Substituting S2JA for S2KA risks reverse breakdown under nominal 800 V conditions. Both share identical I_F (1.5 A), I_FSM (50 A), package (DO-214AC), and thermal specs, but voltage rating is not interchangeable. Always verify worst-case reverse voltage stress before substitution.

What is the junction-to-lead thermal resistance (R_θJL) of S2JA, and why does it matter?

The S2JA has a typical junction-to-lead thermal resistance (R_θJL) of 16 °C/W, as published in the Thermal Performance section. This value quantifies how effectively heat transfers from the silicon die to the PCB copper via the leads. A lower R_θJL enables better thermal performance in high-current operation - especially critical when using minimal copper area or operating near the 1.5 A limit. It complements the higher R_θJA (53 °C/W) to guide layout decisions.