Taiwan Semiconductor Corporation S2JAF-T

Overview

S2JAF-T from Taiwan Semiconductor is a 2 A, 600 V standard surface-mount silicon rectifier diode in SMAF package, featuring glass passivated junction, low reverse leakage (≤5 µA at 25°C), and 150°C maximum junction temperature - used in DC-DC converters and switching-mode inverters.

For engineers reviewing the S2JAF-T datasheet, S2JAF-T pinout, S2JAF-T application, or S2JAF-T equivalent, key selection criteria include repetitive peak reverse voltage (600 V), forward voltage (0.95 V max at 2 A/25°C), thermal resistance (R_θJL = 15 °C/W), and RoHS/halogen-free compliance for industrial power conversion designs.

Technical Context

The S2JAF-T is a single-die, unidirectional standard recovery rectifier optimized for medium-voltage, medium-current switching power supplies. Its glass passivated junction ensures stable reverse characteristics across -55°C to +150°C operating range and low IR drift at elevated temperatures.

Thermal performance is characterized with R_θJL = 15 °C/W and R_θJA = 89 °C/W on a 5 mm × 5 mm copper pad PCB, supporting continuous 2 A conduction without forced cooling in compact layouts. Junction capacitance is 11 pF at 4 V reverse bias and 1 MHz.

Key Specifications

Pinout & Package

Package: SMAF - surface-mount, molded plastic case with matte tin-plated leads, UL 94V-0 rated, polarity indicated by cathode band, weight ≈ 0.035 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R06S and ES2J, the S2JAF-T offers optimal balance of low V_F, industry-standard SMAF footprint, and proven thermal performance on minimal copper area - making it preferred for cost-sensitive, space-constrained 200–600 kHz industrial power supplies.

Availability

S2JAF-T is available at Aetrix Electronics and suitable for DC-DC converters, switching-mode inverters, and general-purpose rectification requiring stable component supply and consistent parametric performance across production lots.

Supply support for S2JAF-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 rectifiers, TVS diodes, and MOSFETs for industrial and consumer markets.

The S2JAF-T belongs to TSC's S2xAF-T family of standard recovery rectifiers designed specifically for reliable, low-cost AC/DC and DC/DC power conversion in space-constrained, thermally demanding applications.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) of the S2JAF-T?

The S2JAF-T has a V_RRM of 600 V, verified per Taiwan Semiconductor's B2103 datasheet. This rating ensures safe operation under transient overvoltage conditions in 400 V_DC bus systems, with 50% margin above nominal line-derived DC voltages. The S2JAF-T maintains this rating across its full operating temperature range (-55°C to +150°C).

Does the S2JAF-T meet RoHS and halogen-free requirements?

Yes, the S2JAF-T is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the official Taiwan Semiconductor documentation. These compliance attributes are built into the molding compound and plating process, and apply to all units shipped under ordering code S2JAF-T - critical for export to EU, Japan, and other regulated markets.

What is the forward voltage (V_F) of the S2JAF-T at 2 A and 25°C?

The S2JAF-T exhibits a maximum forward voltage of 0.95 V at 2 A and 25°C, with typical value 0.90 V. At 125°C, V_F drops to 0.85 V (max), reflecting positive temperature coefficient behavior. This V_F directly determines conduction loss: at 2 A, worst-case loss is 1.9 W, enabling thermal design on standard PCB copper.

Can the S2JAF-T be used as a replacement for the S2DAF-T or S2KAF-T in the same circuit?

No - the S2JAF-T is not interchangeable with S2DAF-T (200 V) or S2KAF-T (800 V) without circuit validation. While all share SMAF package and 2 A rating, their V_RRM values differ significantly. Substituting S2JAF-T for S2KAF-T risks premature breakdown in 800 V applications; using it in place of S2DAF-T adds unnecessary cost and voltage overhead without benefit.

What is the junction-to-lead thermal resistance (R_θJL) of the S2JAF-T, and how is it measured?

The S2JAF-T has an R_θJL of 15 °C/W, measured per JEDEC standards on a test board with 5 mm × 5 mm copper pad. This parameter quantifies thermal resistance from die junction to lead termination - critical for estimating junction temperature rise under conduction loss. For example, at 1.9 W dissipation, ΔT_JL = 28.5°C, assuming lead temperature is maintained near ambient.