Taiwan Semiconductor Corporation S1DFSH

Overview

S1DFSH from Taiwan Semiconductor is a 1 A, 200 V standard surface-mount silicon rectifier diode in SOD-128 package, featuring glass passivated junction, AEC-Q101 qualification, and 30 A surge capability; used in automotive freewheeling and DC/DC converter snubber circuits.

For engineers reviewing the S1DFSH datasheet, S1DFSH pinout, S1DFSH application, or S1DFSH equivalent, key selection factors include its 200 V repetitive peak reverse voltage, 1.00 V max forward voltage at 1.0 A/25°C, 150°C max junction temperature, and SOD-128 mechanical compatibility with automated placement.

Technical Context

This single-die standard rectifier operates as a unidirectional current switch with cathode-band polarity indication. Its glass-passivated junction ensures stable reverse leakage (≤1 µA at 25°C, ≤50 µA at 125°C) and robust thermal performance (R_θJL = 29°C/W).

The device supports high-reliability automotive use via AEC-Q101 qualification and meets JESD201 Class 2 whisker resistance. Its 9 pF junction capacitance at 4 V reverse bias enables effective high-frequency snubbing in switching power supplies.

Key Specifications

Pinout & Package

Package: SOD-128 - surface-mount, flat-lead, single-diode outline per JEDEC DO-221AD; 5 mm × 4.4 mm body, 1.2 mm height, matte tin-plated leads, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR120 and VS-1EWH02-M3, the S1DFSH uniquely combines SOD-128 compactness, AEC-Q101 qualification, and 29°C/W thermal resistance-making it the only option qualified for space-constrained, thermally demanding automotive freewheeling roles.

Availability

S1DFSH is available at Aetrix Electronics and suitable for automotive freewheeling, DC/DC converter snubbing, and industrial power supply rectification requiring stable component supply and AEC-Q101-compliant sourcing.

Supply support for S1DFSH 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 S1DFSH belongs to TSC's AEC-Q101-qualified SOD-128 rectifier family, designed specifically for high-reliability surface-mount rectification in space-constrained automotive power modules and industrial switching supplies.

FAQ

What is the maximum repetitive peak reverse voltage rating for S1DFSH?

The S1DFSH has a maximum repetitive peak reverse voltage (V_RRM) of 200 V, verified per its absolute maximum ratings table. This value defines the highest reverse-biased voltage the diode can block continuously without breakdown. It is critical for selecting appropriate clamping margins in snubber networks and ensuring safe operation in 24 V or 48 V automotive power systems where transient spikes must remain below this threshold. The S1DFSH datasheet confirms this rating applies specifically to the S1DFSH variant-not higher-voltage siblings like S1GFSH.

Is S1DFSH qualified for automotive applications?

Yes, the S1DFSH is explicitly AEC-Q101 qualified, as stated in its features list and confirmed in the mechanical data section. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and unbiased highly accelerated stress test (UHAST). The S1DFSH is intended for automotive under-hood and cabin applications such as solenoid drivers, HVAC blowers, and body control modules where reliability across -40°C to +125°C ambient is mandatory. Its SOD-128 package and lead finish also comply with J-STD-020 and JESD201 Class 2 standards.

What is the forward voltage drop of S1DFSH at 1.0 A and 25°C?

The S1DFSH exhibits a maximum forward voltage (V_F) of 1.10 V at 1.0 A and 25°C, with a typical value of 0.99 V under the same conditions. This parameter is measured using pulse testing (PW = 0.3 ms) to avoid self-heating effects. At elevated junction temperatures (125°C), V_F decreases to a max of 0.95 V, reflecting the negative temperature coefficient of silicon diodes. These values directly determine conduction losses in the S1DFSH's operational use cases, such as freewheeling paths in 12 V automotive systems.

Does S1DFSH have a specified junction capacitance, and what is its value?

Yes, the S1DFSH has a specified junction capacitance (C_J) of 9 pF, measured at 1 MHz and 4.0 V reverse bias. This value is provided in the electrical specifications table and is critical for high-frequency snubber design and EMI suppression in switching power converters. The low capacitance supports fast recovery characteristics suitable for operation up to several hundred kHz. The S1DFSH datasheet notes that C_J remains stable across temperature and bias, making it predictable in dynamic circuit modeling.

What is the thermal resistance from junction to lead (R_θJL) for S1DFSH?

The S1DFSH has a junction-to-lead thermal resistance (R_θJL) of 29°C/W, measured with the device mounted on a 5 mm × 5 mm copper pad test board. This parameter quantifies how effectively heat transfers from the silicon die to the PCB copper through the leads. A low R_θJL enables efficient thermal management without additional heatsinking-especially valuable in densely packed automotive ECUs. The S1DFSH's R_θJL is significantly better than alternatives in larger packages (e.g., TO-277), supporting higher power density designs.