Taiwan Semiconductor Corporation S1JFS

Overview

S1JFS from Taiwan Semiconductor is a 1A, 600V standard surface-mount silicon rectifier diode in SOD-128 package, featuring glass-passivated junction, 30A surge rating, and 150°C max junction temperature; used in DC-DC converters and switching-mode inverters.

For engineers reviewing the S1JFS datasheet, S1JFS pinout, S1JFS application, or S1JFS equivalent, key selection factors include repetitive peak reverse voltage (600 V), forward voltage at 1 A (≤1.1 V @ 25°C), thermal resistance (R_θJL = 29 °C/W), moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance.

Technical Context

The S1JFS 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 surge tolerance (30 A I_FSM, 8.3 ms half-sine).

Thermally, it delivers R_θJL = 29 °C/W and R_θJA = 82 °C/W when mounted on a 5 mm × 5 mm Cu pad PCB - enabling continuous 1 A operation with appropriate board-level heat spreading under ambient conditions up to 75°C.

Key Specifications

Pinout & Package

Package: SOD-128 - flat, gull-wing surface-mount outline with cathode band marking; 5 mm × 3.7 mm footprint, 1.1 mm height; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR160 and VS-1EWH06, the S1JFS offers identical voltage/current ratings and SOD-128 compatibility while delivering lower typical forward voltage (0.99 V vs. 1.15 V) and superior thermal resistance to lead (29 vs. ~35 °C/W), improving power density and thermal headroom in compact designs.

Availability

S1JFS is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial power supplies requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.

Supply support for S1JFS 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, specializing in power rectifiers, TVS diodes, MOSFETs, and bipolar transistors.

The S1JFS belongs to TSC's S1xFS standard rectifier family, engineered for cost-effective, high-yield SMT deployment in mainstream AC-DC and DC-DC power conversion where reliability, thermal performance, and regulatory compliance are essential.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) of the S1JFS?

The S1JFS has a maximum repetitive peak reverse voltage (V_RRM) of 600 V, as specified in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version C2103). This rating defines the highest reverse voltage the device can block repeatedly without breakdown and is validated under standard test conditions (T_A = 25°C). The S1JFS is part of the S1DFS–S1MFS series, where 'J' explicitly denotes the 600 V variant.

What is the forward voltage (V_F) of the S1JFS at 1 A and 25°C?

The forward voltage (V_F) of the S1JFS is guaranteed ≤1.1 V at 1 A forward current and 25°C junction temperature, with a typical value of 0.99 V. This parameter is measured under pulsed conditions (PW = 0.3 ms) to minimize self-heating effects. The S1JFS datasheet also specifies lower V_F at elevated temperatures (e.g., ≤0.95 V @ 1 A, 125°C), supporting stable performance across its full operating range.

Is the S1JFS RoHS and halogen-free compliant?

Yes, the S1JFS is fully RoHS compliant and halogen-free in accordance with IEC 61249-2-21. These compliance statements are explicitly confirmed in the FEATURES section of the Taiwan Semiconductor S1DFS–S1MFS datasheet (Version C2103). The device uses matte tin-plated leads and UL 94V-0 molding compound, satisfying environmental and safety requirements for global commercial and industrial electronics.

What is the moisture sensitivity level (MSL) of the S1JFS?

The S1JFS has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30°C/60% RH and requires no baking prior to reflow soldering. This MSL rating is documented in the FEATURES section of the official datasheet and reflects the robustness of the SOD-128 package construction and internal passivation, simplifying SMT manufacturing flow for the S1JFS.

What is the thermal resistance from junction to lead (R_θJL) for the S1JFS?

The junction-to-lead thermal resistance (R_θJL) of the S1JFS is 29 °C/W, measured under standard test conditions using a PCB with a 5 mm × 5 mm copper pad. This value is published in the THERMAL PERFORMANCE section of the datasheet and is critical for estimating solder joint temperature rise during operation. It confirms the S1JFS's suitability for thermally constrained SMT applications where lead temperature must remain below 150°C.