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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation PU4BC

Name: PU4BC
Brand: Taiwan Semiconductor Corporation
SKU: PU4BC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PU4BC

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AB, SMC

Datasheet:: PU4BC.pdf

Description:: 25NS, 4A, 100V, ULTRA FAST RECOV

Quantity:: RFQ Add To RFQ list

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Inventory:2,975

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Product details

Overview

PU4BC from Taiwan Semiconductor is a 4A, 100V ultra-fast surface-mount rectifier in DO-214AB (SMC) package, featuring 25ns reverse recovery time, 0.84V forward voltage at 4A/25°C, and 130A surge current capability. It serves as a primary output rectifier in high-frequency DC/DC converters requiring low conduction loss and fast switching.

For engineers reviewing the PU4BC datasheet, PU4BC pinout, PU4BC application, or PU4BC equivalent, key selection criteria include its 100V V_RRM, 25ns trr, 13°C/W R_θJL, 78pF junction capacitance, and suitability for snubber circuits and automated SMT assembly.

Technical Context

The PU4BC employs planar silicon technology to achieve ultra-fast recovery with controlled minority-carrier lifetime, enabling operation in hard-switched topologies up to several hundred kHz. Its single-die configuration and DO-214AB package support high thermal dissipation via PCB copper pads.

Designed for minimal reverse recovery charge (Q_rr = 57nC) and low IR (≤2µA @ 25°C), the PU4BC reduces switching losses and EMI in flyback and forward converters. The 175°C maximum junction temperature supports operation in thermally constrained industrial power supplies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - Maximum repetitive reverse voltage before breakdown; sets safe operating margin for 48V–72V bus applications
I_F	4 A - Continuous average forward current at T_L = 75°C on 16mm×16mm Cu pad; defines steady-state power delivery capacity
t_rr	25 ns - Measured at I_F = 0.5A, I_R = 1.0A, I_rr = 0.25A; enables efficient operation in >200kHz switching converters
V_F @ 4A/25°C	0.84 V - Forward voltage drop determining conduction loss and thermal rise under full load
R_θJL	13 °C/W - Junction-to-lead thermal resistance; enables direct heat transfer to PCB traces without heatsink
Q_rr	57 nC - Reverse recovery charge affecting turn-off loss and snubber sizing in hard-switched topologies

Pinout & Package

DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band, UL 94V-0 rated compound, 0.200g weight.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side (e.g., transformer secondary center-tap or switch node)
Cathode	Forward current exit / reverse blocking terminal	Connected to output rail; cathode band marks this terminal for correct PCB orientation

Key Features

Feature	Design Value
Ultra-fast recovery (t_rr ≤ 25 ns)	Reduces turn-off switching loss and diode-induced ringing in high-frequency SMPS
Low V_F (0.84 V @ 4A/25°C)	Minimizes conduction loss and improves efficiency in 12V–48V output stages
High I_FSM (130 A)	Withstands large inrush and transient currents during startup or overload without failure
Junction temperature rating (−55°C to +175°C)	Supports reliable operation in automotive under-hood and industrial ambient environments

Applications

AC-DC Adapter Output Rectification	DC/DC Converter Secondary Side
Use Scenario: 24V/3A offline adapter with active clamp flyback topology operating at 250kHz. IC Role / Device Role / Timing Role: Primary output rectifier handling continuous 4A average current and 130A surge pulses. Use Value: 25ns t_rr and 57nC Q_rr reduce switching loss by ~18% vs. standard FRD, improving full-load efficiency to >89%.	Use Scenario: Isolated 48V-to-12V telecom DC/DC module with synchronous rectification disabled. IC Role / Device Role / Timing Role: Freewheeling diode in forward converter secondary, conducting during MOSFET off-time. Use Value: 0.84V V_F limits conduction loss to <0.34W at 4A, enabling compact thermal design without forced air.
Snubber Network Diode	High-Frequency Inverter Auxiliary Rectification
Use Scenario: RCD snubber across primary-side MOSFET in 100kHz half-bridge inverter driving induction heater. IC Role / Device Role / Timing Role: Fast-recovery diode clamping voltage spikes during MOSFET turn-off. Use Value: 25ns t_rr ensures clean voltage clamping without reverse recovery tail, suppressing EMI above 30MHz.	Use Scenario: Auxiliary 15V bias supply rectifier in 500kHz LLC resonant converter for server PSU. IC Role / Device Role / Timing Role: Output rectifier for auxiliary winding, operating continuously at 1.2A with high dv/dt stress. Use Value: 100V V_RRM provides 2.5× safety margin over peak reflected voltage (38V), preventing avalanche-induced failure.

AC-DC Adapter Output Rectification

DC/DC Converter Secondary Side

Use Scenario: 24V/3A offline adapter with active clamp flyback topology operating at 250kHz.

IC Role / Device Role / Timing Role: Primary output rectifier handling continuous 4A average current and 130A surge pulses.

Use Value: 25ns t_rr and 57nC Q_rr reduce switching loss by ~18% vs. standard FRD, improving full-load efficiency to >89%.

Use Scenario: Isolated 48V-to-12V telecom DC/DC module with synchronous rectification disabled.

IC Role / Device Role / Timing Role: Freewheeling diode in forward converter secondary, conducting during MOSFET off-time.

Use Value: 0.84V V_F limits conduction loss to <0.34W at 4A, enabling compact thermal design without forced air.

Snubber Network Diode

High-Frequency Inverter Auxiliary Rectification

Use Scenario: RCD snubber across primary-side MOSFET in 100kHz half-bridge inverter driving induction heater.

IC Role / Device Role / Timing Role: Fast-recovery diode clamping voltage spikes during MOSFET turn-off.

Use Value: 25ns t_rr ensures clean voltage clamping without reverse recovery tail, suppressing EMI above 30MHz.

Use Scenario: Auxiliary 15V bias supply rectifier in 500kHz LLC resonant converter for server PSU.

IC Role / Device Role / Timing Role: Output rectifier for auxiliary winding, operating continuously at 1.2A with high dv/dt stress.

Use Value: 100V V_RRM provides 2.5× safety margin over peak reflected voltage (38V), preventing avalanche-induced failure.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH4L06D (STMicroelectronics)	600V V_RRM, 4A I_F, 35ns t_rr, DO-214AB package	Higher voltage rating suits 400V PFC front-end; slower recovery increases loss in >200kHz designs	Select when system requires ≥400V reverse blocking; avoid if optimizing for 250kHz+ DC/DC efficiency
ES4D (Vishay)	200V V_RRM, 4A I_F, 35ns t_rr, same DO-214AB footprint	Higher V_RRM allows use in 200V systems; 10ns slower recovery raises switching loss by ~22%	Acceptable for 100kHz–150kHz applications where voltage margin outweighs speed penalty

Compared with STTH4L06D and ES4D, the PU4BC delivers superior high-frequency performance due to its 25ns t_rr and 57nC Q_rr, making it optimal for compact, high-efficiency DC/DC converters where thermal headroom and EMI control are critical.

Availability

PU4BC is available at Aetrix Electronics and suitable for AC-DC adapters, isolated DC/DC modules, snubber networks, and high-frequency inverter auxiliary supplies requiring stable component supply and J-STD-020 Level 1 moisture sensitivity compliance.

Supply support for PU4BC 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 PU4BC belongs to TSC's PU4x ultra-fast rectifier family, engineered specifically for high-frequency switching power supplies where low Q_rr, tight V_F distribution, and robust surge capability are essential.

FAQ

What is the maximum junction temperature rating for the PU4BC?

The PU4BC has a maximum junction temperature (T_J) rating of +175°C, verified per absolute maximum ratings table in the official TSC datasheet Version A2210. This allows reliable operation in high-ambient industrial environments. Derating curves confirm usable current down to −55°C storage temperature. The PU4BC must be mounted on a 16mm × 16mm copper pad to achieve specified thermal resistance.

Does the PU4BC have a defined pinout or terminal assignment?

Yes - the PU4BC uses a two-terminal DO-214AB (SMC) package with clearly defined anode and cathode terminals. The cathode is marked by a visible band on the device body. In circuit layout, the cathode connects to the positive output rail, and the anode to the switching node or transformer secondary. This polarity is critical for proper rectification function in the PU4BC.

What is the reverse recovery time (t_rr) specification for the PU4BC?

The PU4BC reverse recovery time is specified as ≤25ns under test conditions of I_F = 0.5A, I_R = 1.0A, and I_rr = 0.25A. An alternate measurement at I_F = 1.0A, di/dt = 50A/µs, VR = 30V yields 31ns. These values are confirmed in the Electrical Specifications section of the TSC PU4BC–PU4DC datasheet (Version A2210). The PU4BC achieves this performance using planar ultra-fast technology.

Is the PU4BC RoHS compliant and halogen-free?

Yes - the PU4BC is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the TSC datasheet. The molding compound meets UL 94V-0 flammability rating, and the matte tin-plated leads are solderable per J-STD-002. Moisture sensitivity level is rated J-STD-020 Level 1, confirming unlimited floor life for the PU4BC.

How does the PU4BC compare to the PU4DC variant?

The PU4BC and PU4DC share identical package (DO-214AB), current rating (4A I_F), thermal specs (R_θJL = 13°C/W), and recovery characteristics (t_rr ≤ 25ns), but differ in V_RRM: PU4BC is rated for 100V, while PU4DC is rated for 200V. The marking code "PU4BC" appears directly on the device body. Both are manufactured by Taiwan Semiconductor under version A2210 and are not interchangeable without voltage-margin verification.

PU4BC Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AB, SMC

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 100 V

Current - Average Rectified (Io):: 4A

Voltage - Forward (Vf) (Max) @ If:: 930 mV @ 4 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 25 ns

Current - Reverse Leakage @ Vr:: 2 µA @ 100 V

Capacitance @ Vr, F:: 78pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AB (SMC)

Operating Temperature - Junction:: -55°C ~ 175°C

PU4BC FAQ

1.How can I place an order for PU4BC through Aetrix?

Please submit a Request for Quotation (RFQ) for PU4BC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PU4BC reliable?

The price and inventory of PU4BC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PU4BC is usually 5 days.

3.What payment methods are accepted for PU4BC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PU4BC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PU4BC?

PU4BC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PU4BC order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PU4BC?

For technical support, including PU4BC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PU4BC requirements.

6.How does Aetrix verify that PU4BC is sourced from the original manufacturer or authorized distributors?

All PU4BC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PU4BC meets industry standards.

7.What is the process for return or replacement of PU4BC?

All PU4BC units undergo pre-shipment inspection (PSI). If there is an issue with PU4BC, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PU4BC part is unused and in its original packaging.

Return procedure for PU4BC:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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