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

Taiwan Semiconductor Corporation PU4BB

Name: PU4BB
Brand: Taiwan Semiconductor Corporation
SKU: PU4BB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PU4BB

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: PU4BB.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:5,940

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Product details

Overview

PU4BB from Taiwan Semiconductor is a 4A, 100V ultra-fast surface-mount rectifier in DO-214AA (SMB) 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 PU4BB datasheet, PU4BB pinout, PU4BB application, or PU4BB equivalent, key selection criteria include repetitive peak reverse voltage (100V), thermal resistance (R_θJL = 13°C/W), junction temperature range (–55°C to +175°C), and ultra-fast recovery performance for snubber and switching power supply designs.

Technical Context

The PU4BB employs planar silicon technology optimized for high-efficiency rectification in high-frequency switching topologies. Its 25ns reverse recovery time and 57nC reverse recovery charge enable reduced switching losses in resonant and quasi-resonant converters.

Thermal design is supported by low junction-to-lead resistance (13°C/W) when mounted on a 10mm × 10mm copper pad, and its moisture sensitivity level 1 rating ensures compatibility with standard SMT reflow processes without baking.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - Maximum repetitive reverse voltage before breakdown; sets safe operating limit in 48V-output DC/DC designs
I_F	4 A - Continuous average forward current; supports 50W–60W output stages with adequate heatsinking
t_rr	25 ns - Measured at I_F = 0.5A, I_R = 1.0A, I_rr = 0.25A; enables operation up to ~2 MHz switching frequencies
V_F	0.84 V @ 4A, 25°C - Low conduction loss reduces power dissipation to ~3.4W at full load
R_θJL	13 °C/W - Junction-to-lead thermal resistance; allows direct thermal path to PCB copper for passive cooling
Q_rr	57 nC - Reverse recovery charge; determines turn-off loss and EMI profile in hard-switched converters

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode-indicating band; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to input/switching node side; requires trace width sufficient for 4A continuous current
Cathode	Forward current exit point	Connected to output/bus side; polarity marked by visible band; critical for correct orientation in automated placement

Key Features

Feature	Design Value
Ultra-fast recovery (t_rr ≤ 25 ns)	Minimizes turn-off loss and diode-induced ringing in high-frequency synchronous and flyback converters
Low V_F (0.84 V @ 4A)	Reduces conduction loss by ~15% vs. standard FR-type rectifiers, improving efficiency in 12V–48V outputs
Junction temp. rating (–55°C to +175°C)	Enables reliable operation in under-hood automotive DC/DC modules and industrial power supplies with ambient >105°C
Moisture sensitivity level 1	Eliminates pre-bake requirement prior to reflow, reducing manufacturing cycle time and cost

Applications

High-Frequency DC/DC Converter	Snubber Circuit
Use Scenario: Primary-side synchronous rectification in isolated 500kHz–1MHz LLC resonant converters delivering 36–48V output. IC Role / Device Role / Timing Role: Ultra-fast freewheeling rectifier handling bidirectional current during dead-time intervals. Use Value: 25ns t_rr prevents reverse conduction overlap, reducing shoot-through risk and improving ZVS behavior.	Use Scenario: RCD snubber network across MOSFET drain-source in hard-switched flyback or forward converters. IC Role / Device Role / Timing Role: Fast-recovery clamp diode absorbing leakage inductance energy during switch turn-off. Use Value: Low Q_rr (57nC) limits snubber dissipation and avoids secondary voltage overshoot exceeding V_RRM.
Industrial AC-DC Adapter	Automotive On-Board Charger (OBC) Auxiliary Supply
Use Scenario: Secondary-side output rectification in universal-input 90–264VAC adapters powering 24V control logic. IC Role / Device Role / Timing Role: High-current, low-loss output rectifier operating continuously at 4A average load. Use Value: R_θJL = 13°C/W enables stable thermal performance on standard 2oz copper without heatsink.	Use Scenario: Isolated auxiliary supply (12V/3A) inside OBC modules powering gate drivers and MCU. IC Role / Device Role / Timing Role: Input-stage rectifier in wide-temp DC/DC stage accepting 12–48V battery input. Use Value: –55°C to +175°C T_J rating ensures startup reliability at cold cranking and sustained operation near power semiconductors.

High-Frequency DC/DC Converter

Snubber Circuit

Use Scenario: Primary-side synchronous rectification in isolated 500kHz–1MHz LLC resonant converters delivering 36–48V output.

IC Role / Device Role / Timing Role: Ultra-fast freewheeling rectifier handling bidirectional current during dead-time intervals.

Use Value: 25ns t_rr prevents reverse conduction overlap, reducing shoot-through risk and improving ZVS behavior.

Use Scenario: RCD snubber network across MOSFET drain-source in hard-switched flyback or forward converters.

IC Role / Device Role / Timing Role: Fast-recovery clamp diode absorbing leakage inductance energy during switch turn-off.

Use Value: Low Q_rr (57nC) limits snubber dissipation and avoids secondary voltage overshoot exceeding V_RRM.

Industrial AC-DC Adapter

Automotive On-Board Charger (OBC) Auxiliary Supply

Use Scenario: Secondary-side output rectification in universal-input 90–264VAC adapters powering 24V control logic.

IC Role / Device Role / Timing Role: High-current, low-loss output rectifier operating continuously at 4A average load.

Use Value: R_θJL = 13°C/W enables stable thermal performance on standard 2oz copper without heatsink.

Use Scenario: Isolated auxiliary supply (12V/3A) inside OBC modules powering gate drivers and MCU.

IC Role / Device Role / Timing Role: Input-stage rectifier in wide-temp DC/DC stage accepting 12–48V battery input.

Use Value: –55°C to +175°C T_J rating ensures startup reliability at cold cranking and sustained operation near power semiconductors.

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	V_RRM = 600V, t_rr = 35ns, V_F = 1.15V @ 4A - higher voltage rating but slower recovery and higher conduction loss	Suitable for 400V PFC front-end stages; not recommended for >500kHz DC/DC where t_rr < 30ns is required	Select PU4BB over STTH4L06D when operating frequency exceeds 300kHz or V_RRM ≤ 100V suffices
SS54-E3/57T	V_RRM = 40V, t_rr = 35ns, I_F = 5A - lower voltage rating, same speed, higher current, but unsuitable for 100V bus applications	Targeted at 5–24V output rails; cannot withstand 100V reverse transients in boost-derived topologies	Choose PU4BB instead of SS54-E3/57T when reverse voltage exceeds 40V or system includes 100V transient clamping

Compared with STTH4L06D and SS54-E3/57T, PU4BB uniquely balances 100V V_RRM, 25ns t_rr, and 4A I_F in SMB package-making it optimal for compact, high-frequency 48V-output DC/DC where voltage margin, speed, and thermal performance are simultaneously constrained.

Availability

PU4BB is available at Aetrix Electronics and suitable for high-frequency DC/DC converters, snubber networks, industrial AC-DC adapters, and automotive auxiliary power supplies requiring stable component supply and long-term manufacturability.

Supply support for PU4BB 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 since 1979.

The PU4BB belongs to TSC's ultra-fast rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in space-constrained industrial and automotive power supplies.

FAQ

What is the maximum repetitive peak reverse voltage rating for PU4BB?

The PU4BB has a maximum repetitive peak reverse voltage (V_RRM) of 100 V, as specified in the Absolute Maximum Ratings table. This rating defines the highest reverse voltage the device can block repeatedly without breakdown. Exceeding this value risks irreversible avalanche failure. The PU4BB is therefore suited for 48V-output systems with appropriate derating margins, but not for 200V bus applications covered by the PU4DB variant.

Does PU4BB have a defined reverse recovery time, and under what test conditions?

Yes, PU4BB has a reverse recovery time (t_rr) of 25 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. An alternate measurement at I_F = 1.0 A, di/dt = 50 A/µs, VR = 30 V yields 31 ns. These values confirm its classification as an ultra-fast rectifier suitable for switching frequencies above 500 kHz in DC/DC converters.

What is the forward voltage drop of PU4BB at full rated current and room temperature?

The forward voltage (V_F) of PU4BB is 0.84 V at I_F = 4 A and T_J = 25°C, with a maximum of 0.93 V under the same conditions. This low V_F contributes to reduced conduction losses-approximately 3.4 W at full load-making PU4BB more efficient than standard fast recovery diodes with V_F > 1.0 V at 4 A.

Is PU4BB compatible with lead-free reflow soldering processes?

Yes, PU4BB features matte tin-plated leads that meet J-STD-002 solderability requirements and are fully compatible with standard lead-free reflow profiles (peak temperature up to 260°C). Its moisture sensitivity level is rated Level 1 per J-STD-020, meaning it can be stored indefinitely in dry packs and placed directly into reflow without baking.

What thermal resistance values are specified for PU4BB, and how are they measured?

PU4BB specifies R_θJL = 13°C/W (junction-to-lead), R_θJC = 17°C/W (junction-to-case), and R_θJA = 69°C/W (junction-to-ambient). All values are measured with the device mounted on a 10 mm × 10 mm copper pad per JEDEC standards. R_θJL is most relevant for PCB-level thermal design, as it reflects heat transfer from die to solder joint.

PU4BB Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AA, SMB

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-214AA (SMB)

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

PU4BB FAQ

1.How can I place an order for PU4BB through Aetrix?

Please submit a Request for Quotation (RFQ) for PU4BB 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 PU4BB reliable?

The price and inventory of PU4BB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PU4BB is usually 5 days.

3.What payment methods are accepted for PU4BB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PU4BB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PU4BB?

PU4BB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PU4BB 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 PU4BB?

For technical support, including PU4BB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PU4BB requirements.

6.How does Aetrix verify that PU4BB is sourced from the original manufacturer or authorized distributors?

All PU4BB 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 PU4BB meets industry standards.

7.What is the process for return or replacement of PU4BB?

All PU4BB units undergo pre-shipment inspection (PSI). If there is an issue with PU4BB, 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 PU4BB part is unused and in its original packaging.

Return procedure for PU4BB:

1.Submit a request within 90 days.

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

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