Taiwan Semiconductor Corporation S1KFSH

Overview

S1KFSH from Taiwan Semiconductor is a 1A, 800V standard surface-mount silicon rectifier diode in SOD-128 package, featuring glass-passivated junction, AEC-Q101 qualification, and 30A surge capability; used for freewheeling and snubber functions in automotive DC/DC converters.

For engineers reviewing the S1KFSH datasheet, S1KFSH pinout, S1KFSH application, or S1KFSH equivalent, key selection criteria include peak reverse voltage (800 V), forward voltage at 1 A (≤1.10 V @ 25°C), thermal resistance (R_θJL = 29 °C/W), and AEC-Q101 qualification for automotive reliability validation.

Technical Context

This device is a single-die, unidirectional silicon PN junction rectifier optimized for high-reliability surface-mount power conversion. Its glass-passivated chip junction ensures stable reverse leakage (<1 µA @ 25°C, <50 µA @ 125°C) and robust moisture resistance (MSL Level 1).

The SOD-128 package enables high power density with low thermal resistance to lead (29 °C/W) and supports automated placement. Polarity is marked by cathode band; terminals are matte tin-plated per J-STD-002 solderability standards.

Key Specifications

Pinout & Package

Package: SOD-128 - Surface-mount plastic case per JEDEC DO-221AD, polarity indicated by cathode band, matte tin-plated leads, UL 94V-0 molding compound, weight ≈0.027 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-1EWH08-M3/5AT, S1KFSH adds AEC-Q101 assurance and lower V_F; versus MUR1080CT, it trades current capacity and speed for compact SMD integration and automotive compliance-ideal for space-constrained, qualified automotive power stages.

Availability

S1KFSH is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial snubber networks, and on-board charger auxiliary supplies requiring stable component supply and AEC-Q101-compliant sourcing.

Supply support for S1KFSH 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 semiconductor manufacturer specializing in discrete power devices, analog ICs, and protection components.

The S1KFSH belongs to TSC's S1xFSH family of AEC-Q101-qualified surface-mount rectifiers designed specifically for automotive power conversion and industrial snubbing where reliability, thermal performance, and compact packaging are critical.

FAQ

What is the peak repetitive reverse voltage rating of the S1KFSH?

The S1KFSH has a peak repetitive reverse voltage (V_RRM) rating of 800 V. This value is specified in the Absolute Maximum Ratings table and defines the maximum reverse-bias voltage the device can block repeatedly without breakdown. It is confirmed across all official documentation versions (B2306) and distinguishes S1KFSH from adjacent variants like S1JFSH (600 V) and S1MFSH (1000 V). The S1KFSH must not be operated beyond this voltage in continuous or repetitive conditions.

Is the S1KFSH qualified for automotive applications?

Yes, the S1KFSH is explicitly AEC-Q101 qualified, as stated in the FEATURES section of the official datasheet. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock-validating its suitability for under-hood and safety-critical automotive systems. The S1KFSH shares this qualification across the entire S1xFSH series, and no derating or additional screening is required for automotive use per TSC documentation.

What is the forward voltage of the S1KFSH at 1 A and 25°C?

The forward voltage (V_F) of the S1KFSH is guaranteed ≤1.10 V at I_F = 1 A and T_J = 25°C, with a typical value of 0.99 V. This parameter is listed in the ELECTRICAL SPECIFICATIONS table under "MAX" column. At elevated junction temperature (125°C), V_F decreases to ≤0.95 V, reflecting the negative temperature coefficient of silicon PN junctions. These values are measured using pulse testing (PW = 0.3 ms) to avoid self-heating effects.

What package type does the S1KFSH use, and what are its key mechanical attributes?

The S1KFSH uses the SOD-128 surface-mount package, defined per JEDEC DO-221AD Variation AD. Key mechanical attributes include a 5 mm × 5 mm copper pad thermal test board reference, matte tin-plated leads compliant with J-STD-002, polarity indicated by cathode band, UL 94V-0 flammability rating, and MSL Level 1 moisture sensitivity. Its weight is approximately 0.027 g, and the package outline conforms to drawing HQ2SD07-SOD128-039 REV A.

Does the S1KFSH have a specified junction capacitance, and how is it measured?

Yes, the S1KFSH has a typical junction capacitance (C_J) of 9 pF, measured at 1 MHz and V_R = 4.0 V. This value appears in the ELECTRICAL SPECIFICATIONS table under "TYP" column with no "MAX" limit provided. The low capacitance supports reduced switching losses in snubber and freewheeling applications, especially at higher frequencies. Measurement follows standard small-signal AC conditions with 50 mV_p-p signal amplitude, as noted in the Characteristics Curves section.