Taiwan Semiconductor Corporation S2KA

Overview

S2KA from Taiwan Semiconductor is a surface-mount general-purpose silicon rectifier diode with 800 V repetitive peak reverse voltage (VRRM), 1.5 A average forward current (IF), and DO-214AC (SMA) package. It features low forward voltage drop (≤1.1 V at 1.5 A, 25°C), high surge capability (50 A IFSM), and operates up to 150°C junction temperature - used in snubber networks and DC-DC converter output stages.

For engineers reviewing the S2KA datasheet, S2KA pinout, S2KA application, or S2KA equivalent, key selection criteria include its 800 V VRRM rating, 1.5 A continuous conduction capability, DO-214AC thermal performance (RθJA = 53°C/W), reverse recovery time (trr = 1500 ns), and RoHS/halogen-free compliance for industrial power supply designs.

Technical Context

The S2KA is a single-die, standard recovery rectifier optimized for cost-sensitive, medium-voltage switching power applications. Its 1500 ns reverse recovery time and 30 pF junction capacitance reflect trade-offs between switching speed and leakage/robustness - suitable for non-high-frequency flyback and forward converters where EMI filtering and surge resilience are prioritized over ultra-fast switching.

Thermally, the DO-214AC package delivers RθJL = 16°C/W to lead and RθJA = 53°C/W in free air, enabling 1.5 A operation without forced cooling below ~70°C ambient. The device's 50 A IFSM rating supports transient overload handling in inverter and lighting ballast circuits.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1L08S and ES1J, the S2KA offers higher current capacity (1.5 A vs. 1 A) and matching DO-214AC footprint with ES1J, but trades off recovery speed (1500 ns vs. sub-100 ns) for robust surge handling and cost efficiency in non-resonant topologies.

Availability

S2KA is available at Aetrix Electronics and suitable for DC-DC converters, snubber networks, lighting ballasts, and switching mode inverters requiring stable component supply with industrial-grade reliability and RoHS/halogen-free compliance.

Supply support for S2KA 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 industrial, computing, and consumer markets since 1979.

The S2KA belongs to TSC's S2x series of general-purpose rectifiers designed for cost-effective, thermally robust AC/DC and DC/DC power conversion in industrial and lighting applications - emphasizing manufacturability, JEDEC-compliant reliability, and broad voltage scalability.

FAQ

What is the maximum repetitive peak reverse voltage (VRRM) for the S2KA?

The S2KA has a VRRM rating of 800 V, verified per Taiwan Semiconductor's K2102 datasheet. This value defines the highest instantaneous reverse voltage the diode can block repeatedly without breakdown. Designers must ensure peak circuit voltage - including transients and ringing - remains below this limit. The S2KA is part of the S2AA–S2MA family, where 'K' corresponds to the 800 V grade, and the S2KA part number explicitly denotes this rating.

Does the S2KA have a specified reverse recovery time (trr), and how does it affect circuit performance?

Yes, the S2KA has a typical reverse recovery time (trr) of 1500 ns under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions. This relatively long trr indicates standard recovery behavior, making the S2KA suitable for ≤100 kHz switching applications like flyback converters and snubbers, but not recommended for high-frequency resonant topologies. The S2KA's trr directly impacts switching loss and EMI generation - designers should account for this in gate drive timing and snubber sizing.

What package type does the S2KA use, and what are its mechanical identifiers?

The S2KA uses the DO-214AC (SMA) surface-mount package, confirmed by TSC's mechanical drawings and ordering information. Key identifiers include a molded epoxy case rated UL 94V-0, cathode polarity indicated by a visible band, matte tin-plated leads compliant with J-STD-002, and a typical weight of 0.060 g. The S2KA shares this footprint with other S2x series devices, enabling layout reuse across voltage grades - e.g., S2JA (600 V) and S2MA (1000 V).

Is the S2KA RoHS and halogen-free compliant, and what standards apply?

Yes, the S2KA is RoHS compliant and halogen-free per IEC 61249-2-21, as stated in the official Taiwan Semiconductor documentation. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and bromine/chlorine content is controlled to meet halogen-free definitions. This compliance is verified for the S2KA specifically - not assumed from the family - and supports use in environmentally regulated industrial and consumer products sold in EU, China, and Japan markets.

What is the forward voltage (VF) specification for the S2KA, and under what conditions is it measured?

The S2KA has a maximum forward voltage (VF) of 1.1 V at IF = 1.5 A and TJ = 25°C, per the electrical specifications table. This is measured using a 0.3 ms pulse width to avoid self-heating effects. At elevated temperatures or higher currents, VF increases - e.g., ~1.25 V at 1.5 A and 125°C. This parameter directly determines conduction loss in the S2KA, so thermal design must ensure junction temperature stays within limits to maintain efficiency targets in applications like DC-DC converters.