Taiwan Semiconductor Corporation RS3K

Overview

RS3K from Taiwan Semiconductor is a fast recovery surface-mount rectifier diode with 800 V repetitive peak reverse voltage (V_RRM), 3 A average forward current (I_F), and 500 ns reverse recovery time (t_rr) at I_F = 0.5 A, used in snubber networks and switching-mode power supplies.

For engineers reviewing the RS3K datasheet, RS3K pinout, RS3K application, or RS3K equivalent, key selection criteria include its DO-214AB (SMC) package, 100 A peak surge rating (I_FSM), 175 °C maximum junction temperature, and glass-passivated junction for reliability in high-efficiency DC/DC converters.

Technical Context

The RS3K operates as a single-die, unidirectional fast recovery rectifier optimized for high-frequency switching applications. Its 500 ns t_rr enables reduced switching losses in SMPS topologies, while the 800 V V_RRM supports operation across 400–600 V bus systems with margin.

Thermally, it features 15 °C/W junction-to-lead (R_θJL) and 50 °C/W junction-to-ambient (R_θJA) resistance, enabling 3 A continuous conduction with appropriate PCB copper area. The cathode band marking and matte tin-plated leads comply with J-STD-002 solderability and JESD 201 Class 2 whisker requirements.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount, molded plastic case meeting UL 94V-0; polarity indicated by cathode band; weight ≈0.210 g.

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 RS3K trades speed for higher voltage margin and surge robustness-making it optimal for 800 V-class industrial SMPS and inverters where reliability under transient stress outweighs nanosecond-level recovery gains.

Availability

RS3K is available at Aetrix Electronics and suitable for DC/DC converters, snubber networks, and switching mode inverters requiring stable component supply, consistent parametric performance, and long-term industrial lifecycle support.

Supply support for RS3K 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 RS3K belongs to TSC's RS3x fast recovery rectifier family, designed specifically for high-efficiency, high-reliability power conversion in space-constrained surface-mount applications demanding extended thermal and surge resilience.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for RS3K?

The RS3K has a maximum repetitive peak reverse voltage (V_RRM) of 800 V, as specified in the absolute maximum ratings table. This rating defines the highest reverse voltage the device can block repeatedly without breakdown under normal operating conditions, making RS3K suitable for 400–600 V DC bus applications with safety margin. The value is confirmed across all official TSC documentation versions M2304 and is not shared with lower-voltage variants like RS3J (600 V) or RS3G (400 V).

What is the reverse recovery time (t_rr) of RS3K and how is it measured?

The RS3K has a reverse recovery time (t_rr) of 500 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A per the electrical specifications table. This parameter reflects the time required for the diode to transition from forward conduction to reverse blocking state, directly impacting switching loss in high-frequency power converters. The test circuit and waveform are documented in Figure 6 of the RS3K datasheet.

Is RS3K RoHS compliant and halogen-free?

Yes, RS3K is RoHS compliant and halogen-free, as explicitly stated in the FEATURES section of the official TSC documentation. These environmental attributes are verified per EU Directive 2011/65/EU and IEC 61249-2-21, ensuring suitability for export-controlled and green-electronics programs. The halogen-free status applies to the molding compound and plating materials, with no brominated or chlorinated flame retardants used.

What package type does RS3K use and what are its key mechanical properties?

RS3K uses the DO-214AB (SMC) surface-mount package, defined per JEDEC DO-214 Variation AB. Key mechanical properties include UL 94V-0 flammability rating, matte tin-plated leads compliant with J-STD-002, moisture sensitivity level 1 (no bake required), and a typical weight of 0.210 g. The package outline dimensions and suggested pad layout are provided in Version M2304, drawing HQ2SD07-DO214SMC-036 REV A.

What is the maximum junction temperature (T_J(max)) and how does it affect thermal design?

The RS3K has a maximum junction temperature (T_J(max)) of +175 °C, allowing operation in high-ambient industrial environments. This rating, combined with R_θJL = 15 °C/W and R_θJA = 50 °C/W, informs PCB thermal design: for 3 A continuous conduction, ≥1 cm² of 2-oz copper connected to both leads is recommended to maintain T_J ≤150 °C at 75 °C ambient. Derating curves in Figure 1 confirm usable current drops to ~2.2 A at 125 °C lead temperature.