Taiwan Semiconductor Corporation PUAD8D

Overview

PUAD8D from Taiwan Semiconductor is a 200 V, 8 A ultra-fast surface-mount rectifier in ThinDPAK package, featuring 25 ns reverse recovery time, 1.00 V max forward voltage at 8 A/25°C, and 150 A surge current capability-designed for high-frequency DC/DC converters and snubber circuits.

For engineers reviewing the PUAD8D datasheet, PUAD8D pinout, PUAD8D application, or PUAD8D equivalent, key selection criteria include its 200 V repetitive peak reverse voltage, low R_θJC of 2.0 °C/W, 101 pF junction capacitance at 1 MHz, and compatibility with automated placement per J-STD-020 Level 1 moisture sensitivity.

Technical Context

The PUAD8D employs planar silicon technology to achieve ultra-fast switching performance with controlled reverse recovery characteristics. Its single-die configuration supports high-efficiency operation in hard-switched topologies where low conduction loss and minimal stored charge (Q_rr = 35 nC) are critical.

Thermal design is enabled by direct copper leadframe mounting in the ThinDPAK package, delivering R_θJL = 3.5 °C/W and R_θJC = 2.0 °C/W when mounted on an aluminum heatsink (2" × 3" × 0.25"). The cathode-band polarity marking ensures unambiguous orientation during assembly.

Key Specifications

Pinout & Package

Package: ThinDPAK (JEDEC TO-252 variation AE), 3-terminal surface-mount package with exposed copper drain pad for thermal and electrical connection. Cathode indicated by band on molded body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PUAD8D, STTH8R06DJF offers higher voltage headroom at the expense of conduction loss, while VS-8EWH06FN-M3 delivers superior recovery metrics in identical packaging-making it suitable for next-generation high-density SMPS where Q_rr and layout reuse are critical.

Availability

PUAD8D is available at Aetrix Electronics and suitable for high-frequency DC/DC converters, snubber networks, and industrial motor drive freewheeling requiring stable component supply and consistent parametric performance across production lots.

Supply support for PUAD8D 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 devices, and MOSFETs for industrial and computing markets.

The PUAD8D belongs to TSC's ultra-fast rectifier product line, engineered specifically for high-frequency switching power supplies where low Q_rr, tight V_F tolerance, and robust thermal performance are mandatory.

FAQ

What is the maximum repetitive peak reverse voltage rating for PUAD8D?

The PUAD8D has a specified V_RRM of 200 V, verified per the manufacturer's absolute maximum ratings table. This rating applies under repetitive conditions at T_A = 25°C and defines the highest reverse voltage the device can block continuously without breakdown. Derating is required above 25°C ambient per the forward current derating curve in the datasheet.

Does PUAD8D support automated pick-and-place assembly?

Yes, PUAD8D supports automated placement per J-STD-020 Level 1 moisture sensitivity classification and features matte tin-plated leads compliant with J-STD-002 solderability requirements. Its ThinDPAK package geometry and cathode-band polarity marking are optimized for vision-guided placement and reflow profiling.

What is the thermal resistance from junction to case (R_θJC) for PUAD8D?

The PUAD8D has a typical R_θJC of 2.0 °C/W, measured with the device mounted on a 2" × 3" × 0.25" aluminum heatsink. This value reflects direct thermal conduction from the silicon die through the exposed cathode pad, enabling precise thermal modeling in high-power density layouts.

How does the reverse recovery time (t_rr) of PUAD8D compare between test conditions?

PUAD8D specifies t_rr ≤ 25 ns under I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A, and ≤ 23 ns under I_F = 1.0 A, di/dt = 50 A/µs, V_R = 30 V. A separate measurement yields 19 ns under I_F = 8.0 A, di/dt = 200 A/µs, V_R = 100 V-confirming consistent ultra-fast behavior across operating ranges.

Is PUAD8D RoHS-compliant and halogen-free?

Yes, PUAD8D is certified RoHS-compliant and halogen-free per manufacturer documentation. The molding compound meets UL 94V-0 flammability rating, and all materials comply with IPC-1752A reporting standards for restricted substances, supporting compliance in industrial and consumer end products.