Taiwan Semiconductor Corporation RSFMLH

Overview

RSFMLH from Taiwan Semiconductor is a 1000 V, 0.5 A fast recovery surface-mount rectifier in Sub SMA package, featuring 500 ns reverse recovery time, 1.3 V max forward voltage at 0.5 A, and AEC-Q101 qualification for automotive-grade reliability-used in snubber networks and DC-DC converters requiring high-voltage transient suppression.

For engineers reviewing the RSFMLH datasheet, RSFMLH pinout, RSFMLH application, or RSFMLH equivalent, key selection criteria include peak reverse voltage (1000 V), thermal resistance (R_θJA = 150 °C/W), junction temperature range (–55 to +150 °C), and moisture sensitivity level (MSL 1), all critical for under-hood automotive power designs.

Technical Context

The RSFMLH implements a single-die, glass-passivated PN junction optimized for fast switching with 500 ns trr, enabling high-frequency operation in flyback and snubber circuits. Its metallurgically bonded construction ensures stable thermal performance up to 150 °C junction temperature.

Designed for automated SMT placement, the device uses matte tin-plated leads compliant with J-STD-002 solderability and meets JESD201 Class 2 whisker resistance. Polarity is marked by a cathode band on the Sub SMA case.

Key Specifications

Pinout & Package

Package: Sub SMA - surface-mount plastic package with molded UL 94V-0 compound, cathode-indicated band, and matte tin-plated leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R06 and ES1J, the RSFMLH uniquely delivers 1000 V blocking capability in Sub SMA while maintaining AEC-Q101 qualification-making it the only option among the three qualified for automotive 800 V battery system auxiliary supplies.

Availability

RSFMLH is available at Aetrix Electronics and suitable for automotive DC-DC converters, snubber networks, and car lighting drivers requiring stable component supply across extended temperature and lifetime requirements.

Supply support for RSFMLH 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 RSFMLH belongs to TSC's RSF series of AEC-Q101-qualified fast recovery rectifiers, engineered specifically for high-reliability automotive power conversion and transient suppression where voltage margin and thermal robustness are critical.

FAQ

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

The RSFMLH has a maximum repetitive peak reverse voltage (V_RRM) of 1000 V, confirmed in the Absolute Maximum Ratings table of Taiwan Semiconductor's A2103 datasheet. This rating defines the highest reverse voltage the device can block repeatedly without breakdown and is essential for selecting RSFMLH in 800 V DC bus or 600 V AC-input applications with safety margin. The RSFMLH is the highest-voltage variant in the RSFALH–RSFMLH family.

Is RSFMLH qualified for automotive applications?

Yes, RSFMLH is AEC-Q101 qualified per the manufacturer's documentation, confirming its suitability for automotive power electronics including under-hood environments. This qualification covers stress tests such as high-temperature reverse bias (HTRB), temperature cycling, and electrostatic discharge. The RSFMLH's –55 °C to +150 °C junction temperature range and MSL 1 rating further support automotive manufacturing and field reliability requirements.

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

The RSFMLH 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, as specified in the Electrical Specifications table. This value reflects the time required for the device to transition from forward conduction to reverse blocking state and directly impacts switching loss and EMI in high-frequency circuits like snubbers and DC-DC converters.

What package does RSFMLH use and what are its key mechanical features?

RSFMLH uses the Sub SMA package-a compact surface-mount outline with UL 94V-0 flammability-rated molding compound, matte tin-plated leads compliant with J-STD-002, and polarity indicated by a cathode band. Its weight is approximately 0.019 g, and it meets JESD201 Class 2 whisker resistance. The Sub SMA footprint enables compatibility with standard SMA pick-and-place equipment and reflow processes.

Does RSFMLH have halogen-free and RoHS compliance certifications?

Yes, RSFMLH is both RoHS compliant and halogen-free in accordance with IEC 61249-2-21, as explicitly stated in the FEATURES section of the official datasheet. These environmental qualifications are verified for the entire RSFALH–RSFMLH series and apply directly to RSFMLH. No additional certification documentation is required beyond the manufacturer's published compliance statements.