Taiwan Semiconductor Corporation RS2JAF-T

Overview

RS2JAF-T from Taiwan Semiconductor is a 2 A, 600 V fast recovery surface-mount rectifier in SMAF package, featuring 250 ns reverse recovery time, 1.14 V forward voltage at 2 A/25°C, and 10 pF junction capacitance. It serves as primary output rectifier in high-frequency DC-DC converters requiring low switching loss and thermal stability up to 150°C junction temperature.

For engineers reviewing the RS2JAF-T datasheet, RS2JAF-T pinout, RS2JAF-T application, or RS2JAF-T equivalent, key selection criteria include repetitive peak reverse voltage (600 V), surge current capability (50 A @ 8.3 ms), thermal resistance (R_θJL = 15 °C/W), and RoHS/halogen-free compliance for industrial power supply designs.

Technical Context

The RS2JAF-T employs a single-die, glass-passivated silicon junction optimized for fast recovery in high-frequency switching topologies. Its 600 V V_RRM rating and 250 ns trr enable efficient operation in flyback and forward converters operating above 100 kHz.

Thermal performance is defined by R_θJL = 15 °C/W and R_θJA = 89 °C/W on a 5 mm × 5 mm Cu pad PCB, supporting continuous 2 A conduction with minimal derating below 100°C ambient. Reverse leakage remains ≤5 µA at 25°C and ≤100 µA at 125°C under rated VR.

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 fast recovery rectifier applications.

Compared with STTH2R06S and ES2J, the RS2JAF-T delivers balanced trade-off between recovery speed (250 ns), forward loss (1.14 V), and compact SMAF packaging-making it optimal for space-constrained, thermally managed 2 A power stages where moderate trr suffices.

Availability

RS2JAF-T is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and general-purpose power rectification requiring stable component supply, consistent parametric performance, and full RoHS/halogen-free compliance.

Supply support for RS2JAF-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, serving global industrial, computing, and consumer markets since 1979.

The RS2x series was designed specifically for high-efficiency, surface-mount power rectification in compact AC-DC and DC-DC converters, emphasizing reliability, thermal robustness, and process consistency across voltage grades.

FAQ

What is the maximum junction temperature rating for RS2JAF-T?

The RS2JAF-T has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table. This allows continuous operation in high-ambient environments such as enclosed industrial power supplies. Derating begins above 100°C ambient per the forward current derating curve in the datasheet, and the device must be mounted on a PCB with ≥5 mm × 5 mm copper pad to achieve specified thermal resistance. The RS2JAF-T maintains electrical integrity up to this limit when operated within its V_RRM, I_F, and I_FSM boundaries.

Does RS2JAF-T support automated SMT placement?

Yes, RS2JAF-T supports automated surface-mount placement per its mechanical design: SMAF package with coplanar matte tin-plated leads, J-STD-002 compliant solderability, and moisture sensitivity level (MSL) 1 per J-STD-020-meaning no dry-pack or baking is required prior to reflow. The device's 0.035 g weight and standardized tape-and-reel packaging (7,500 units per reel) are optimized for high-speed pick-and-place machines. The RS2JAF-T's marking code "RS2JAF" and cathode band provide optical recognition compatibility.

How does RS2JAF-T compare to RS2DAF-T in forward voltage and recovery time?

The RS2JAF-T exhibits higher forward voltage than RS2DAF-T: 1.14 V vs. 0.93 V at 2 A/25°C, due to higher voltage-grade silicon optimization. Its reverse recovery time is 250 ns versus RS2DAF-T's 150 ns, reflecting trade-offs in carrier lifetime control for 600 V vs. 200 V breakdown. Both share identical I_F (2 A), I_FSM (50 A), and package (SMAF). The RS2JAF-T is not a drop-in replacement for RS2DAF-T in low-V_F critical designs, but offers superior voltage margin where 600 V rating is required.

Is RS2JAF-T halogen-free and RoHS compliant?

Yes, RS2JAF-T is fully RoHS compliant and halogen-free per IEC 61249-2-21, confirmed in the official Taiwan Semiconductor datasheet Version B2103. The molding compound contains no brominated flame retardants (BFRs), chlorinated flame retardants (CFRs), or antimony trioxide, and lead content is below 1000 ppm. This compliance applies to both the die and package materials, making RS2JAF-T suitable for export to EU, China, and other regulated markets. The RS2JAF-T's declaration is part of TSC's certified environmental management system.

What is the junction-to-ambient thermal resistance of RS2JAF-T?

The junction-to-ambient thermal resistance (R_θJA) of RS2JAF-T is 89 °C/W, measured on a standard test board with 5 mm × 5 mm copper pad per JEDEC standards. This value assumes natural convection and no additional heatsinking. In practice, R_θJA improves significantly with increased copper area, internal layers, or forced airflow. For thermal design, use R_θJL = 15 °C/W when calculating temperature rise from lead-to-PCB interface, as this parameter is less dependent on board layout. The RS2JAF-T's thermal performance is validated across its full operating temperature range (−55°C to +150°C).