Taiwan Semiconductor Corporation RS2KH

Overview

RS2KH from Taiwan Semiconductor is a 2 A, 800 V fast recovery surface-mount rectifier in DO-214AA (SMB) package, featuring 500 ns reverse recovery time, 1.3 V max forward voltage at 2 A, and AEC-Q101 qualification for automotive-grade reliability. It serves as a freewheeling or snubber diode in high-efficiency DC-DC converters and automotive lighting systems.

For engineers reviewing the RS2KH datasheet, RS2KH pinout, RS2KH application, or RS2KH equivalent, key selection criteria include its 800 V repetitive peak reverse voltage, 50 A surge rating, 175 °C maximum junction temperature, moisture sensitivity level 1 compliance, and DO-214AA mechanical compatibility with automated SMT placement.

Technical Context

The RS2KH operates as a single-die, unidirectional fast recovery rectifier optimized for switching power supplies where low conduction loss and controlled reverse recovery are critical. Its glass-passivated junction ensures stable performance under thermal cycling, while the matte tin-plated leads meet J-STD-002 solderability requirements.

With a typical junction-to-lead thermal resistance of 18 °C/W and 55 °C/W junction-to-ambient rating, the RS2KH supports continuous 2 A operation in SMB-mounted designs without forced airflow. Its 50 pF junction capacitance at 4 V reverse bias enables predictable high-frequency behavior in snubber networks.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount plastic case with cathode band marking; dimensions per JEDEC DO-214AA Issue D; weight ≈ 0.090 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R08 and ES2J, the RS2KH uniquely combines AEC-Q101 qualification, 800 V rating, and DO-214AA packaging-enabling automotive SMT designs that demand both high voltage margin and zero reflow prep.

Availability

RS2KH is available at Aetrix Electronics and suitable for automotive LED lighting, DC-DC converter freewheeling, and snubber network applications requiring stable component supply, AEC-Q101 compliance, and DO-214AA footprint consistency.

Supply support for RS2KH 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 automotive, industrial, and consumer markets since 1979.

The RS2KH belongs to TSC's RS2xH fast recovery rectifier family, engineered specifically for high-reliability automotive power conversion where AEC-Q101 validation, thermal robustness, and SMT manufacturability are mandatory.

FAQ

What is the maximum junction temperature rating for RS2KH?

The RS2KH has a maximum junction temperature (T_J) rating of +175 °C, verified per AEC-Q101 stress testing. This allows sustained operation in under-hood automotive environments and thermally dense PCB layouts. The RS2KH must be mounted on adequate copper area to maintain junction temperature within this limit during 2 A continuous conduction. Thermal derating curves in the RS2KH datasheet define safe current vs. ambient temperature boundaries.

Is RS2KH pin-compatible with other devices in the RS2xH series?

Yes, all RS2xH devices-including RS2AH, RS2BH, RS2DH, RS2GH, RS2JH, RS2KH, and RS2MH-share identical DO-214AA (SMB) package dimensions, pinout, and solder pad layout. The RS2KH uses the same anode/cathode terminal configuration and cathode band marking as the rest of the series, enabling voltage-rating swaps without PCB redesign.

Does RS2KH require moisture preconditioning before reflow soldering?

No, RS2KH is rated at moisture sensitivity level (MSL) 1 per J-STD-020, meaning it can be stored indefinitely at standard ambient conditions and placed directly into reflow without baking. This eliminates pre-reflow bake steps, reducing manufacturing cycle time and avoiding potential damage from repeated thermal exposure. The RS2KH's MSL 1 status is confirmed in TSC's official documentation for Version B2304.

What is the reverse recovery time (t_rr) specification for RS2KH?

The RS2KH has a maximum reverse recovery time (t_rr) of 500 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A per the test circuit in Figure 6 of the RS2KH datasheet. This value is guaranteed across the full operating temperature range and supports efficient operation in switching power supplies up to 500 kHz. The RS2KH's t_rr is slower than RS2JH (250 ns) but faster than RS2MH (750 ns), positioning it for balanced speed–voltage trade-offs.

Can RS2KH be used in non-automotive industrial applications?

Yes, RS2KH is qualified for industrial use despite its AEC-Q101 certification. Its 175 °C T_J max, glass-passivated junction, and halogen-free construction make it suitable for industrial motor drives, UPS systems, and telecom power supplies. While AEC-Q101 adds assurance for vibration and thermal cycling, the RS2KH's core electrical specs-such as 800 V V_RRM, 2 A I_F, and 500 ns t_rr-are fully applicable outside automotive contexts. Designers should verify system-level reliability requirements independently.