Taiwan Semiconductor Corporation UF1D

Overview

UF1D from Taiwan Semiconductor is a 200 V, 1 A glass-passivated high-efficiency rectifier diode in DO-204AL (DO-41) package, featuring soft recovery (trr ≤ 50 ns), 1.0 V forward voltage at 1 A and 25°C, and AEC-Q101 qualification option. It serves as a freewheeling or output rectifier in DC-DC converters and switching inverters operating up to 150°C junction temperature.

For engineers reviewing the UF1D datasheet, UF1D pinout, UF1D application, or UF1D equivalent, key selection criteria include repetitive peak reverse voltage (200 V), soft-recovery timing for EMI reduction, thermal resistance (R_θJL = 15 °C/W), and RoHS/halogen-free compliance for automotive and industrial power supplies.

Technical Context

This single-die standard recovery rectifier uses a glass-passivated PN junction to achieve stable high-temperature operation up to 150°C and low leakage (IR ≤ 5 µA at 25°C). Its soft recovery profile minimizes voltage overshoot during commutation in flyback and boost topologies.

The DO-204AL package provides mechanical robustness with pure tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Junction-to-lead thermal resistance of 15 °C/W enables reliable 1 A continuous conduction without forced cooling in ambient temperatures up to 75°C.

Key Specifications

Pinout & Package

DO-204AL (DO-41) axial-leaded package with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, and meet UL 94V-0 flammability rating. Weight: 0.330 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R02 and 1N4004, UF1D delivers optimal balance of soft recovery (50 ns), low V_F (1.0 V), DO-41 compatibility, and AEC-Q101 readiness-making it preferred for compact, thermally constrained, and automotive-grade 1 A rectification tasks.

Availability

UF1D is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and freewheeling applications requiring stable component supply, automotive-grade reliability options, and RoHS-compliant packaging.

Supply support for UF1D 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 LED drivers.

The UF1x series was developed to deliver high-efficiency, soft-recovery rectification in compact DO-41 packages for automotive power systems, industrial SMPS, and consumer switching adapters demanding AEC-Q101 validation and halogen-free materials.

FAQ

What is the maximum repetitive peak reverse voltage rating for UF1D?

The UF1D has a maximum repetitive peak reverse voltage (V_RRM) of 200 V. This rating is confirmed in the Absolute Maximum Ratings table of the G2104 datasheet and defines the highest reverse voltage the device can block repeatedly without breakdown. Designers must ensure system-level transient voltages remain below this value, including safety margins for ringing and overshoot in switching applications. The UF1D is part of a family spanning 50 V to 1000 V, with UF1D specifically assigned to the 200 V grade.

Does UF1D have AEC-Q101 qualification, and how is it ordered?

Yes, UF1D is available in an AEC-Q101 qualified version. Per the Ordering Information section, the AEC-Q101 variant is designated by adding "H" to the base part number - i.e., UF1DH. This version undergoes stress testing per AEC-Q101 standards and is marked accordingly. Standard UF1D is not automatically qualified; only UF1DH carries the certification. Both share identical electrical and thermal specifications, with qualification being a process-level attribute tied to specific manufacturing lots and traceability documentation.

What is the forward voltage drop of UF1D at rated current and temperature?

The UF1D exhibits a typical forward voltage (V_F) of 1.0 V at 1 A forward current and 25°C junction temperature, as specified in the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) to minimize self-heating. At elevated temperatures (e.g., 125°C), V_F decreases slightly due to semiconductor physics, but system-level thermal design must account for resistive heating at full load. The 1.0 V rating directly enables low-loss rectification in 12–24 V output stages using the UF1D.

How does UF1D's reverse recovery time compare to other devices in its voltage class?

The UF1D has a maximum reverse recovery time (t_rr) of 50 ns under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A test conditions - significantly faster than general-purpose rectifiers like 1N4004 (≥2 µs) and optimized for reduced EMI in 100–500 kHz converters. Within the UF1x family, UF1D shares the 50 ns t_rr spec with UF1A, UF1B, UF1G, and UF1J–UF1M are rated at ≤75 ns. This soft recovery behavior is intrinsic to its die design and distinguishes UF1D from conventional slow-recovery diodes.

What package type and lead finish does UF1D use, and what standards does it meet?

UF1D uses the DO-204AL (DO-41) axial-leaded package with pure tin-plated leads. It meets J-STD-002 for solderability, JESD201 Class 2 for tin whisker resistance, and UL 94V-0 for molding compound flammability. The cathode is marked by a visible band, and polarity must be observed during placement. The 0.330 g unit weight and standardized DO-41 dimensions enable compatibility with legacy through-hole assembly lines and automated tape-and-reel feeders (5,000 pcs/reel).