Taiwan Semiconductor Corporation RS1DALH

Overview

RS1DALH from Taiwan Semiconductor is a 1A, 200V fast recovery surface-mount rectifier in a Thin SMA package, featuring glass passivated junction, AEC-Q101 qualification, and 150ns reverse recovery time. It serves as a freewheeling or snubber diode in automotive DC/DC converters where low forward voltage (0.97V at 1A, 25°C) and high-temperature operation (T_J up to 175°C) are critical.

For engineers reviewing the RS1DALH datasheet, RS1DALH pinout, RS1DALH application, or RS1DALH equivalent, key selection factors include its 200V V_RRM, 30A I_FSM surge rating, J-STD-020 Level 1 moisture sensitivity, and compatibility with automated SMT placement on thin-profile PCBs.

Technical Context

This device implements a single-die, planar epitaxial fast recovery rectifier structure with glass passivation for stable junction performance under thermal cycling. Its 150ns trr and 0.97V V_F at 1A/25°C enable efficient switching in medium-frequency (<100 kHz) power conversion stages.

The Thin SMA package (JEDEC DO-221AC) provides 19°C/W junction-to-lead thermal resistance when mounted on a 5mm × 5mm copper pad, supporting continuous 1A conduction at ambient temperatures up to 85°C without derating.

Key Specifications

Pinout & Package

Thin SMA package per JEDEC DO-221AC: 4.40 mm × 2.70 mm × 1.20 mm body, cathode indicated by band, matte tin-plated leads, MSL Level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R02FL and ES1D-E3/57T, the RS1DALH uniquely combines AEC-Q101 qualification, 150ns recovery, and Thin SMA packaging-making it the only option validated for automotive under-hood use without trade-offs in size or reliability.

Availability

RS1DALH is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial snubber circuits, and LED lighting drivers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for RS1DALH 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 automotive, industrial, and consumer markets since 1979.

The RS1DALH belongs to TSC's RS1xALH fast recovery rectifier family, engineered specifically for AEC-Q101-compliant automotive power conversion where thermal robustness, SMT compatibility, and long-term parametric stability are mandatory.

FAQ

What is the maximum junction temperature rating for RS1DALH?

The RS1DALH has a maximum junction temperature (T_J) rating of +175°C, verified per AEC-Q101 stress testing. This allows reliable operation in under-hood automotive environments without forced cooling. The device maintains specified electrical parameters-including forward voltage and reverse leakage-up to this limit when thermal design adheres to the 19°C/W R_θJL specification on a 5mm × 5mm Cu pad. RS1DALH must not be operated beyond 175°C junction temperature in any condition.

Is RS1DALH qualified for automotive applications?

Yes, RS1DALH is AEC-Q101 qualified, meaning it has passed all stress tests required for discrete semiconductors in automotive electronics-including temperature cycling, high-temperature reverse bias, and unbiased highly accelerated stress testing. This qualification covers the exact RS1DALH variant (200V version), not just the family. RS1DALH is approved for use in engine control units, ADAS power supplies, and lighting systems where automotive-grade reliability is mandated.

What is the reverse recovery time (t_rr) of RS1DALH and how is it measured?

The RS1DALH has a typical reverse recovery time (t_rr) of 150 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A at T_J = 25°C. This value is confirmed in the official Taiwan Semiconductor datasheet for RS1DALH and distinguishes it from higher-voltage variants (e.g., RS1JALH = 250 ns). The 150 ns t_rr enables efficient operation in 50–100 kHz switching converters without excessive switching loss.

Does RS1DALH have moisture sensitivity level (MSL) rating and what does it mean for assembly?

RS1DALH is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30°C and ≤60% relative humidity. No baking or dry-pack handling is required prior to reflow soldering. This simplifies SMT line integration and eliminates moisture-related popcorning risk during lead-free reflow (peak 260°C). The Level 1 rating applies specifically to the Thin SMA package used for RS1DALH and is verified through standardized preconditioning tests.

What is the forward voltage drop of RS1DALH at rated current and temperature?

At I_F = 1.0 A and T_J = 25°C, the RS1DALH exhibits a typical forward voltage (V_F) of 0.97 V, with a maximum of 1.30 V. At elevated junction temperature (125°C), V_F drops to 0.83 V typical (0.94 V max), reflecting the negative temperature coefficient of silicon PN junctions. These values are measured using pulse conditions (PW = 0.3 ms) to avoid self-heating effects, and directly impact conduction loss calculations in power stage design using RS1DALH.