Taiwan Semiconductor Corporation SKLW

Overview

SKLW from Taiwan Semiconductor is a single-die, standard surface-mount silicon rectifier diode rated for 800 V repetitive peak reverse voltage (VRRM), 0.8 A average forward current (IF), and 20 A non-repetitive surge current (IFSM), used as primary-side output rectification in offline AC-DC power supplies and DC-DC converters.

For engineers reviewing the SKLW datasheet, SKLW pinout, SKLW application, or SKLW equivalent, key selection criteria include its SOD-123W package thermal performance (RθJA = 84°C/W), low forward voltage (VF = 0.94 V typ at IF = 0.8 A, TJ = 25°C), and guaranteed 150°C maximum junction temperature under continuous operation.

Technical Context

The SKLW operates as a unidirectional, PN-junction rectifier with glass-passivated chip construction, enabling stable reverse leakage (IR ≤ 1 µA at VR = 800 V, TJ = 25°C) and robust surge handling (IFSM = 20 A, 8.3 ms half-sine). Its SOD-123W package features matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.

Thermal design relies on PCB-mounted 5 mm × 5 mm copper pads, delivering RθJL = 30°C/W and RθJC = 31°C/W. Junction capacitance is 7 pF at 1 MHz and VR = 4.0 V, supporting high-frequency switching applications up to several hundred kHz without excessive capacitive loss.

Key Specifications

Pinout & Package

Package: SOD-123W - Surface-mount plastic case with cathode band marking, UL 94V-0 rated molding compound, and 0.016 g mass. Designed for automated placement and reflow soldering per J-STD-020 Level 1 moisture sensitivity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R08 and MBR0580, the SKLW delivers optimal balance of compact SOD-123W packaging, 0.8 A current capability, ultra-low IR, and proven thermal robustness-making it ideal for space-constrained, thermally demanding, and long-lifetime AC-DC designs.

Availability

SKLW is available at Aetrix Electronics and suitable for AC-DC adapter power supplies, industrial DC-DC converters, and LED driver secondary rectification requiring stable component supply and consistent parametric performance across production lots.

Supply support for SKLW 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 industrial, computing, and consumer markets since 1979.

The SDLW–SMLW family was developed specifically for cost-sensitive, high-volume surface-mount rectification in offline power conversion, emphasizing reliability, manufacturability, and compliance with RoHS and halogen-free standards.

FAQ

What is the maximum junction temperature rating for SKLW?

The SKLW has a maximum junction temperature (TJ max) of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet Version C2103. This rating enables continuous operation in enclosed industrial power supplies where ambient temperatures reach 85°C and PCB thermal resistance is managed via 5 mm × 5 mm copper pads. The SKLW must not exceed this limit to maintain reliability and parametric stability.

Does SKLW have a cathode band marking, and how is polarity identified?

Yes, the SKLW uses a visible cathode band on the SOD-123W package body to indicate polarity, per mechanical data in the Taiwan Semiconductor datasheet. The banded end is the cathode terminal, which must connect to the higher-potential node (e.g., output rail or capacitor positive) during forward conduction. This marking aligns with JEDEC-standard SOD-123W orientation and ensures correct placement during automated assembly.

What is the typical forward voltage of SKLW at 0.8 A and 25°C?

The typical forward voltage (VF) of SKLW is 0.94 V at IF = 0.8 A and TJ = 25°C, with a maximum of 1.10 V under the same conditions. This value is measured using pulse testing (PW = 0.3 ms) and directly impacts conduction loss in power stages. At elevated junction temperatures (e.g., 125°C), VF drops to 0.84 V (typ), reducing thermal runaway risk in high-ambient designs.

Is SKLW suitable for use in RoHS-compliant and halogen-free assemblies?

Yes, SKLW is certified RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the "Features" section of the Taiwan Semiconductor datasheet Version C2103. Its matte tin-plated leads, lead-free molding compound, and absence of brominated flame retardants meet strict environmental requirements for commercial, industrial, and medical-grade equipment-without compromising electrical or thermal performance.

What is the junction-to-ambient thermal resistance (RθJA) of SKLW, and how is it measured?

The junction-to-ambient thermal resistance (RθJA) of SKLW is 84°C/W, measured with the device mounted on a standard 5 mm × 5 mm copper pad test board per JEDEC JESD51-3. This value assumes natural convection and defines the worst-case thermal gradient from die to ambient air. For improved cooling, designers may increase copper area or add thermal vias-though RθJA remains a critical input for calculating steady-state TJ under given IF and ambient conditions.