Taiwan Semiconductor Corporation S1DF-T

Overview

S1DF-T from Taiwan Semiconductor is a 1 A, 200 V repetitive peak reverse voltage (V_RRM) surface-mount standard rectifier diode in SMAF package, featuring glass-passivated junction, low reverse leakage (≤5 µA at 25°C), and 0.94 V forward voltage at 1.0 A/25°C - used in DC-DC converters and switching-mode power supplies.

For engineers reviewing the S1DF-T datasheet, S1DF-T pinout, S1DF-T application, or S1DF-T equivalent, key selection criteria include V_RRM margin for 200 V systems, thermal resistance (R_θJA = 89 °C/W on 5 mm × 5 mm Cu pad), moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance for industrial PCB assembly.

Technical Context

The S1DF-T is a single-die, unidirectional silicon rectifier optimized for high-reliability, automated SMT placement. Its glass-passivated junction ensures stable reverse characteristics across -55°C to +150°C junction temperature range and supports surge current handling up to 30 A (8.3 ms half-sine).

Thermal performance is defined with standardized PCB mounting (5 mm × 5 mm Cu pad), yielding R_θJL = 15 °C/W and R_θJC = 22 °C/W. Electrical behavior is characterized at 25°C and 125°C, with forward voltage dropping to 0.83 V at 1.0 A/125°C and reverse leakage rising to ≤150 µA at 125°C.

Key Specifications

Pinout & Package

Package: SMAF (Surface Mount Axial Flat), molded UL 94V-0 compound, matte tin-plated leads, cathode indicated by band. Weight: 0.035 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M100SFA and VS-1EWH02-M3/5AT, the S1DF-T delivers superior thermal performance (R_θJA = 89 °C/W), lower forward voltage, and full MSL 1 compliance - making it optimal for high-volume, space-constrained, and thermally demanding industrial power designs.

Availability

S1DF-T is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and general-purpose industrial power supplies requiring stable component supply, RoHS-compliant sourcing, and MSL 1 manufacturability.

Supply support for S1DF-T 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 S1DF-T belongs to TSC's S1x-F series of standard surface-mount rectifiers, designed specifically for cost-sensitive, high-reliability power conversion applications where automated assembly, thermal stability, and regulatory compliance are essential.

FAQ

What is the maximum junction temperature rating for the S1DF-T?

The S1DF-T has a maximum junction temperature (T_JMAX) of +150°C, validated across its full operating range from -55°C to +150°C. This rating applies under both continuous conduction and transient surge conditions, and is measured with the device mounted on a standard 5 mm × 5 mm copper pad per JEDEC test board guidelines. The S1DF-T maintains electrical integrity and leakage performance within this envelope, making it suitable for enclosed industrial environments where ambient temperatures exceed 85°C.

Does the S1DF-T have a specified moisture sensitivity level (MSL)?

Yes, the S1DF-T is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and does not require dry-packaging or baking prior to reflow soldering. This classification is confirmed in the official Taiwan Semiconductor datasheet (Version B2103) and stems from its fully molded UL 94V-0 compound and matte tin-plated leads. As a result, the S1DF-T supports standard SMT assembly processes without special handling, reducing manufacturing overhead versus MSL 3 or higher alternatives.

What is the forward voltage of the S1DF-T at 1.0 A and 125°C?

The S1DF-T exhibits a forward voltage (V_F) of 0.83 V (typical) and 0.93 V (maximum) at 1.0 A and 125°C, per the Electrical Specifications table in the Taiwan Semiconductor datasheet. This reduction from room-temperature V_F (0.94 V max) reflects the negative temperature coefficient of silicon PN junctions. Designers can use this value to calculate conduction losses and thermal rise in high-ambient applications such as motor drive power stages or outdoor LED drivers.

Is the S1DF-T pin-compatible with other devices in the S1xF-T family?

No - while all S1xF-T variants (S1DF-T through S1MF-T) share identical SMAF packaging, pinout, and mechanical dimensions, they differ exclusively in V_RRM rating (200 V to 1000 V) and associated marking code. The S1DF-T has no functional or electrical pin-level incompatibility with S1GF-T or S1JF-T, but substitution must be verified against system-level reverse voltage stress. The cathode band orientation and anode/cathode terminal assignment remain unchanged across the family.

What is the junction-to-lead thermal resistance (R_θJL) of the S1DF-T?

The S1DF-T has a typical junction-to-lead thermal resistance (R_θJL) of 15 °C/W, measured under standard JEDEC conditions with the device soldered to a 5 mm × 5 mm copper pad. This parameter quantifies heat transfer efficiency from the die to the PCB copper via the lead frame, and is critical for estimating local temperature rise when using internal copper planes as thermal relief. It is lower than R_θJA (89 °C/W), confirming that thermal performance improves significantly with proper PCB copper design.