Taiwan Semiconductor Corporation S1DLW

Overview

S1DLW from Taiwan Semiconductor is a 1A, 200V standard surface-mount silicon rectifier diode in SOD-123W package, featuring 30A peak surge current capability, 1.1V max forward voltage at 1A, and 1µA max reverse leakage at 25°C - deployed in DC-DC converters and switching-mode power supplies.

For engineers reviewing the S1DLW datasheet, S1DLW pinout, S1DLW application, or S1DLW equivalent, key selection criteria include repetitive peak reverse voltage (200V), thermal resistance (R_θJL = 25°C/W), junction temperature range (–55°C to +175°C), and RoHS/halogen-free compliance for industrial power conversion designs.

Technical Context

The S1DLW is a single-die, unidirectional silicon PN junction rectifier optimized for high-efficiency, low-loss operation in medium-voltage switching power supplies. Its 200V V_RRM, 1A average forward current rating, and 30A I_FSM support robust transient handling in compact layouts.

Thermally, it delivers R_θJL = 25°C/W and R_θJA = 80°C/W, enabling reliable operation up to +175°C junction temperature. The SOD-123W package provides J-STD-020 Level 1 moisture sensitivity and matte tin-plated leads compliant with J-STD-002 solderability.

Key Specifications

Pinout & Package

Package: SOD-123W - surface-mount, single-diode case with cathode band marking, 0.019g weight, UL 94V-0 molding compound, and JESD201 Class 2 whisker-resistant matte tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR120 and VS-1EWH02-M3, the S1DLW offers identical voltage/current ratings and SOD-123W compatibility with Vishay's part, while providing superior moisture robustness (J-STD-020 Level 1 vs Level 3 for MUR120) and halogen-free compliance aligned with modern industrial sourcing requirements.

Availability

S1DLW is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial power supplies requiring stable component supply, full RoHS/halogen-free compliance, and automated SMT placement support.

Supply support for S1DLW 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, including rectifiers, TVS diodes, and MOSFETs for industrial and consumer applications.

The S1DLW belongs to TSC's S1xLW standard rectifier family, designed specifically for cost-sensitive, high-volume surface-mount power conversion where reliability, thermal performance, and assembly compatibility are critical.

FAQ

What is the maximum junction temperature rating for the S1DLW?

The S1DLW has a maximum junction temperature (T_JMAX) of +175°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet. This rating enables operation in thermally demanding environments such as enclosed industrial power supplies or proximity to hot-switching MOSFETs. Derating curves confirm usable current capacity down to ambient temperatures as low as –55°C. The S1DLW maintains electrical integrity across this full range when mounted per recommended SOD-123W pad layout.

Does the S1DLW meet RoHS and halogen-free requirements?

Yes, the S1DLW is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the Taiwan Semiconductor product documentation. The device uses molding compound and matte tin-plated leads that satisfy both directives. No brominated flame retardants or chlorine-based compounds are present. This makes the S1DLW suitable for export to EU, Japan, and other regulated markets where substance restrictions apply - confirmed in Version D2109 of the S1DLW–S1MLW datasheet.

What is the forward voltage specification for the S1DLW at rated current?

The S1DLW has a maximum forward voltage (V_F) of 1.1 V at I_F = 1 A and T_J = 25°C, measured under pulse test conditions (PW = 0.3 ms). This value defines worst-case conduction loss in power stages. Typical V_F is lower, but design margining should use the 1.1 V limit. The S1DLW maintains this spec across its full operating temperature range, with V_F decreasing slightly at elevated junction temperatures due to semiconductor physics.

Is the S1DLW pin-compatible with other S1xLW series devices like S1GLW or S1JLW?

No - the S1DLW shares the same SOD-123W package and pinout (anode/cathode) with S1GLW, S1JLW, S1KLW, and S1MLW, but they are not functionally interchangeable without circuit review. While mechanical fit is identical, their V_RRM ratings differ (200V vs 400V/600V/800V/1000V), so substituting S1DLW for a higher-voltage variant risks reverse breakdown. Always verify reverse voltage stress margins before replacement. The S1DLW marking code "1DLW" is laser-etched for traceability.

What is the reverse leakage current of the S1DLW at elevated temperature?

At T_J = 125°C and rated reverse voltage (200V), the S1DLW exhibits a maximum reverse leakage current (I_R) of 50 µA, per electrical specifications in the Taiwan Semiconductor datasheet. This is significantly higher than the 1 µA limit at 25°C, reflecting expected semiconductor behavior. Designers must account for this increase in high-temperature applications such as enclosed LED drivers or automotive under-hood power modules, where leakage contributes directly to standby power loss.