Taiwan Semiconductor Corporation RS3JB-T

Overview

RS3JB-T from Taiwan Semiconductor is a 600 V, 3 A fast recovery surface-mount rectifier in DO-214AA (SMB) package, featuring 250 ns reverse recovery time, 1.10 V forward voltage at 3.0 A/25°C, and 80 A surge current capability. It serves as the primary AC-to-DC conversion diode in high-frequency switching power supplies.

For engineers reviewing the RS3JB-T datasheet, RS3JB-T pinout, RS3JB-T application, or RS3JB-T equivalent, key selection criteria include its 600 V repetitive peak reverse voltage, thermal resistance of 20 °C/W (junction-to-lead), low leakage (<5 µA @ 25°C), and compatibility with automated SMT placement on standard PCB footprints.

Technical Context

The RS3JB-T employs a single-die, glass-passivated silicon junction optimized for fast recovery in high-frequency switching topologies. Its 250 ns trr enables efficient operation in SMPS designs operating up to several hundred kHz without excessive switching losses.

Thermal performance is defined by R_θJL = 20 °C/W and R_θJA = 78 °C/W on a 10 mm × 10 mm Cu pad, supporting continuous 3 A conduction at ambient temperatures up to +85°C with appropriate board layout.

Key Specifications

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode-indicating band; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 1 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH3L06S and ES3J, the RS3JB-T balances moderate recovery speed (250 ns) with low forward drop (1.10 V) and proven manufacturability in DO-214AA, making it optimal for cost-sensitive, thermally constrained 100–300 kHz SMPS designs.

Availability

RS3JB-T is available at Aetrix Electronics and suitable for AC-DC front-end rectification, DC-DC converter output stages, and switched-mode inverter inputs requiring stable component supply across industrial, telecom, and consumer power applications.

Supply support for RS3JB-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.

The RS3JB-T belongs to TSC's RS3x series of fast recovery rectifiers designed specifically for high-efficiency, high-reliability switching power supplies in industrial and computing applications.

FAQ

What is the maximum junction temperature rating for RS3JB-T?

The RS3JB-T has a maximum junction temperature (T_JMAX) of +150°C, enabling reliable operation in enclosed power supplies and industrial environments where ambient temperatures exceed 85°C. This rating is validated per JEDEC test conditions and supports derating curves shown in Figure 1 of the official TSC datasheet. Thermal design must account for R_θJL = 20 °C/W to ensure the RS3JB-T stays within this limit under full-load conditions.

Is RS3JB-T compatible with lead-free reflow soldering processes?

Yes, the RS3JB-T features matte tin-plated leads qualified to J-STD-002 for solderability and is rated for lead-free reflow profiles with peak temperatures up to 260°C. Its moisture sensitivity level (MSL) is Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH and placed directly into reflow without baking. This makes the RS3JB-T fully compatible with standard high-volume SMT assembly lines.

What does the "JB" in RS3JB-T signify?

The "JB" in RS3JB-T denotes the 600 V repetitive peak reverse voltage (V_RRM) rating within the RS3x-T family. Per TSC's ordering nomenclature, "DB" = 200 V, "GB" = 400 V, "JB" = 600 V, "KB" = 800 V, and "MB" = 1000 V. This coding is laser-marked as "RS3JB" on the device body and is used exclusively to identify the voltage grade-no other electrical or thermal parameters vary across the series except V_RRM, V_R(RMS), and t_rr.

How does RS3JB-T compare to RS3DB-T in terms of reverse recovery performance?

The RS3JB-T has a specified reverse recovery time (t_rr) of 250 ns, compared to 150 ns for the RS3DB-T (200 V version). This difference arises from the higher voltage-rated die structure, which trades some speed for increased depletion layer robustness. Both share identical package, thermal metrics, and forward characteristics at rated current, so the RS3JB-T remains suitable for 100–300 kHz applications where 250 ns recovery introduces negligible loss penalty.

Can RS3JB-T be used in place of a Schottky diode in low-voltage DC-DC outputs?

No-the RS3JB-T is a PN-junction fast recovery rectifier with V_F ≥ 0.99 V, whereas Schottky diodes typically offer V_F < 0.5 V at comparable currents. Using RS3JB-T in low-voltage (e.g., 3.3 V or 5 V) outputs would increase conduction loss significantly and reduce efficiency. It is intended for higher-voltage applications (≥12 V outputs or AC inputs) where its 600 V rating and 250 ns t_rr provide optimal trade-offs; for low-V_OUT buck converters, a Schottky or MOSFET synchronous rectifier is preferred.