Taiwan Semiconductor Corporation S2J-T

Overview

S2J-T from Taiwan Semiconductor is a 2 A, 600 V standard surface-mount silicon rectifier diode in DO-214AA (SMB) package, featuring glass-passivated junction, low reverse leakage (≤5 µA at 25°C), and 50 A surge capability (8.3 ms). It serves as a primary AC/DC front-end rectifier in compact switching power supplies.

For engineers reviewing the S2J-T datasheet, S2J-T pinout, S2J-T application, or S2J-T equivalent, key selection criteria include its 600 V repetitive peak reverse voltage, forward voltage of 0.95 V at 2 A/25°C, thermal resistance of 78 °C/W (junction-to-ambient), RoHS/halogen-free compliance, and suitability for automated SMT assembly on PCBs with 10 mm × 10 mm copper pads.

Technical Context

The S2J-T is a single-die, unidirectional standard recovery rectifier optimized for general-purpose switching-mode power conversion. Its glass-passivated junction ensures stable reverse characteristics across temperature, while the DO-214AA (SMB) package supports high-density layout and meets J-STD-020 moisture sensitivity level 1.

Electrical behavior is defined by a typical forward voltage of 0.82 V at 2 A and 125°C, reverse current ≤300 µA at 125°C, and junction capacitance of 11 pF at 4 V reverse bias - enabling predictable performance in DC-DC converters operating up to 100 kHz switching frequencies.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, single-anode/single-cathode configuration. Cathode identified by molded band. Matte tin-plated leads, solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R06 and MUR260, the S2J-T delivers lower forward voltage and reverse leakage at the expense of slower recovery - making it optimal for cost-driven, thermally constrained, and low-frequency (<50 kHz) rectifier applications where efficiency and reliability outweigh speed requirements.

Availability

S2J-T is available at Aetrix Electronics and suitable for AC/DC adapters, DC-DC converter input stages, and industrial auxiliary power supplies requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for S2J-T 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, specializing in power devices, rectifiers, TVS diodes, and MOSFETs since 1979.

The S2J-T belongs to TSC's S2x-T standard rectifier family, engineered for high-volume, cost-sensitive power conversion applications where reliability, manufacturability, and regulatory compliance (RoHS/halogen-free) are essential design requirements.

FAQ

What is the maximum repetitive peak reverse voltage (VRRM) rating for the S2J-T?

The S2J-T has a VRRM rating of 600 V, meaning it can reliably block up to 600 volts of reverse voltage in repetitive operation. This value is confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version C2102) and defines the upper voltage limit for safe use in AC line rectification or DC bus clamping circuits. Exceeding this rating risks avalanche breakdown and permanent damage to the S2J-T.

Does the S2J-T have a halogen-free construction?

Yes, the S2J-T is halogen-free in accordance with IEC 61249-2-21, as explicitly stated in the FEATURES section of the Taiwan Semiconductor datasheet. This applies to both the molding compound and internal materials, supporting environmental compliance for export markets and safer thermal decomposition during end-of-life processing. The S2J-T carries full RoHS compliance documentation through TSC's certified supply chain.

What is the forward voltage (VF) of the S2J-T at 2 A and 25°C?

The forward voltage of the S2J-T is specified as 0.95 V maximum at 2 A and 25°C, per the Electrical Specifications table. This value represents the worst-case conduction drop under nominal conditions and is used for thermal and efficiency calculations. At elevated temperature (125°C), VF drops to 0.82 V maximum, reflecting the negative temperature coefficient of silicon PN junctions - a key characteristic leveraged in the S2J-T's thermal design margining.

Is the S2J-T suitable for automated SMT assembly?

Yes, the S2J-T is explicitly designed for automated placement, as noted in its FEATURES list. Its DO-214AA (SMB) package, matte tin-plated leads compliant with J-STD-002, and moisture sensitivity level 1 (per J-STD-020) eliminate pre-bake requirements and ensure compatibility with standard reflow profiles. The cathode band marking also supports optical recognition in pick-and-place systems, reducing misalignment risk during SMT assembly of the S2J-T.

What is the junction-to-ambient thermal resistance (RθJA) of the S2J-T?

The junction-to-ambient thermal resistance of the S2J-T is 78 °C/W, measured on a standard test board with a 10 mm × 10 mm copper pad. This value is critical for calculating temperature rise under real-world power dissipation and appears in the Thermal Performance section of the datasheet. It assumes no additional heatsinking - adding thermal vias or larger copper areas will reduce effective RθJA below 78 °C/W for the S2J-T in production layouts.