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

Taiwan Semiconductor Corporation PUAD8BH

Name: PUAD8BH
Brand: Taiwan Semiconductor Corporation
SKU: PUAD8BH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PUAD8BH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: PUAD8BH.pdf

Description:: 19NS, 8A, 100V, ULTRA FAST RECOV

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PUAD8BH from Taiwan Semiconductor is an AEC-Q101-qualified ultra-fast surface-mount rectifier with 100 V repetitive peak reverse voltage (V_RRM), 8 A average forward current (I_F), and 25 ns maximum reverse recovery time (t_rr), designed for high-frequency switching in automotive and industrial DC/DC converters.

For engineers reviewing the PUAD8BH datasheet, PUAD8BH pinout, PUAD8BH application, or PUAD8BH equivalent, key selection criteria include its ThinDPAK package thermal performance (R_θJC = 2.0 °C/W), low forward voltage (0.92 V at 8 A, 25°C), and AEC-Q101 qualification for under-hood automotive use.

Technical Context

This single-die planar rectifier operates with ultra-fast recovery (t_rr ≤ 25 ns) and low junction capacitance (C_J = 101 pF at 1 MHz, 4 V), enabling efficient high-frequency snubber and flyback operation. Its 175°C maximum junction temperature and JESD201 Class 2 whisker resistance support harsh-environment reliability.

The device uses a cathode-banded polarity indicator and matte tin-plated leads compliant with J-STD-002 solderability. Thermal design leverages its 2.0 °C/W junction-to-case resistance when mounted on an aluminum heat sink per specified test condition.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - Maximum repetitive reverse blocking voltage; defines safe operating range in DC/DC output rectification
I_F	8 A - Continuous average forward current at case temperature; determines power-handling capability in conduction mode
t_rr	≤25 ns - Reverse recovery time at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables >1 MHz switching without excessive switching loss
V_F	0.92 V max at I_F = 8 A, T_J = 25°C - Forward voltage drop directly impacts conduction loss and thermal rise in high-current paths
R_θJC	2.0 °C/W - Junction-to-case thermal resistance; enables precise heatsink sizing when mounted per JEDEC TO-252-AE layout
Q_rr	35 nC - Reverse recovery charge; quantifies stored charge dissipated during turn-off, critical for EMI and loss modeling
AEC-Q101	Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and UHAST per stress test requirements

Pinout & Package

PUAD8BH is housed in a ThinDPAK (JEDEC TO-252, variation AE) package with three terminals: Pin 1 (Anode), Pin 2 (Cathode), Pin 3 (Exposed Drain Pad / Cathode Tie). The exposed pad is electrically connected to the cathode and serves as the primary thermal path to the PCB copper pour or heatsink.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	Main AC/switching node input; connects to transformer secondary or switch node in flyback/forward topologies
Pin 2	Cathode	Output node; ties to output capacitor and load; also connected to exposed pad (Pin 3)
Pin 3 (Exposed Pad)	Cathode Thermal & Electrical Tie	Provides low-inductance, low-resistance cathode connection and primary thermal conduction path to PCB heatsinking area

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive under-hood applications including temperature cycling, high-temp reverse bias, and unbiased HAST
Ultra-fast recovery (t_rr ≤ 25 ns)	Minimizes switching losses and EMI generation in >500 kHz DC/DC converters and snubber circuits
Low R_θJC = 2.0 °C/W	Enables compact thermal design with direct PCB copper heatsinking-no external heatsink required for ≤5 W dissipation
Moisture sensitivity level 1	Zero bake requirement before reflow; supports standard SMT assembly without dry-pack or floor-life constraints
Halogen-free & RoHS compliant	Meets automotive ELV Directive and IPC-1752A material declaration requirements for sustainable manufacturing

Applications

Automotive DC/DC Converters	Industrial Switch-Mode Power Supplies
Use Scenario: Secondary-side rectification in 12 V–48 V isolated DC/DC modules for ADAS ECUs and body control units. IC Role / Device Role / Timing Role: Ultra-fast output rectifier replacing Schottky diodes where higher V_RRM and lower leakage are required. Use Value: Enables 100 V blocking with <2 µA reverse leakage at 125°C-critical for system-level efficiency and thermal stability in engine bay environments.	Use Scenario: Output rectification in high-density 24 V/48 V telecom and server PSUs operating at 300–600 kHz. IC Role / Device Role / Timing Role: High-efficiency, low-loss rectifier in synchronous or quasi-resonant topologies requiring fast t_rr and low Q_rr. Use Value: 35 nC Q_rr and 25 ns t_rr reduce turn-off loss by ~30% vs. standard FRDs, improving full-load efficiency by 0.4–0.6%.
Snubber Networks	High-Frequency Flyback Converters
Use Scenario: Clamp diode in RCD snubbers across MOSFETs in motor drive inverters and industrial SMPS. IC Role / Device Role / Timing Role: Fast-recovery clamp element absorbing voltage spikes during MOSFET turn-off transitions. Use Value: 23 ns t_rr (at di/dt = 50 A/µs) ensures rapid recombination, minimizing snubber energy loss and oscillation risk.	Use Scenario: Primary-side auxiliary supply rectification and secondary-side output rectification in compact flyback adapters. IC Role / Device Role / Timing Role: Surface-mount rectifier handling intermittent peak currents up to 150 A (I_FSM) during startup or overload. Use Value: 150 A surge rating and 175°C T_J_MAX allow reliable operation under transient overloads without thermal runaway.

Automotive DC/DC Converters

Industrial Switch-Mode Power Supplies

Use Scenario: Secondary-side rectification in 12 V–48 V isolated DC/DC modules for ADAS ECUs and body control units.

IC Role / Device Role / Timing Role: Ultra-fast output rectifier replacing Schottky diodes where higher V_RRM and lower leakage are required.

Use Value: Enables 100 V blocking with <2 µA reverse leakage at 125°C-critical for system-level efficiency and thermal stability in engine bay environments.

Use Scenario: Output rectification in high-density 24 V/48 V telecom and server PSUs operating at 300–600 kHz.

IC Role / Device Role / Timing Role: High-efficiency, low-loss rectifier in synchronous or quasi-resonant topologies requiring fast t_rr and low Q_rr.

Use Value: 35 nC Q_rr and 25 ns t_rr reduce turn-off loss by ~30% vs. standard FRDs, improving full-load efficiency by 0.4–0.6%.

Snubber Networks

High-Frequency Flyback Converters

Use Scenario: Clamp diode in RCD snubbers across MOSFETs in motor drive inverters and industrial SMPS.

IC Role / Device Role / Timing Role: Fast-recovery clamp element absorbing voltage spikes during MOSFET turn-off transitions.

Use Value: 23 ns t_rr (at di/dt = 50 A/µs) ensures rapid recombination, minimizing snubber energy loss and oscillation risk.

Use Scenario: Primary-side auxiliary supply rectification and secondary-side output rectification in compact flyback adapters.

IC Role / Device Role / Timing Role: Surface-mount rectifier handling intermittent peak currents up to 150 A (I_FSM) during startup or overload.

Use Value: 150 A surge rating and 175°C T_J_MAX allow reliable operation under transient overloads without thermal runaway.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH8L06D	600 V V_RRM, 8 A I_F, t_rr = 35 ns, TO-252 package	Higher voltage rating but slower recovery; suited for PFC stages, not optimal for high-frequency DC/DC output	Select PUAD8BH when V_RRM ≤ 100 V and t_rr < 25 ns is mandatory for EMI-sensitive designs
MBR8100CT	100 V V_RRM, dual common-cathode Schottky, 8 A per diode, VF ≈ 0.75 V, no recovery time	No reverse recovery charge, but higher IR (>100 µA at 125°C); unsuitable for high-temp reverse-bias hold	Choose PUAD8BH over MBR8100CT when reverse leakage <2 µA at 125°C and AEC-Q101 compliance are required

Compared with STTH8L06D and MBR8100CT, PUAD8BH uniquely balances 100 V rating, sub-25 ns t_rr, AEC-Q101 qualification, and <2 µA IR at 125°C-making it the only option meeting all four criteria for automotive DC/DC rectification.

Availability

PUAD8BH is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial switch-mode power supplies, and snubber networks requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant sourcing.

Supply support for PUAD8BH 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 automotive, industrial, and computing markets since 1979.

The PUAD8BH belongs to TSC's AEC-Q101-qualified ultra-fast rectifier product line, engineered specifically for high-frequency, high-reliability rectification in automotive power conversion and industrial SMPS where low Q_rr, tight t_rr distribution, and thermal robustness are critical.

FAQ

What is the maximum junction temperature rating for PUAD8BH?

The PUAD8BH has a maximum junction temperature (T_J_MAX) of +175°C, verified per AEC-Q101 stress testing. This rating allows continuous operation in under-hood automotive environments and high-ambient industrial settings. Derating curves in the PUAD8BH datasheet define allowable I_F versus case temperature, with full 8 A rated up to ~110°C case temperature when properly heatsunk.

Is PUAD8BH pin-compatible with other ThinDPAK rectifiers like PUAD8DH?

Yes, PUAD8BH shares identical ThinDPAK (TO-252-AE) mechanical footprint and pinout with PUAD8DH, differing only in V_RRM (100 V vs. 200 V) and marking code (UAD8B vs. UAD8D). Both use Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Exposed Cathode Pad. No PCB layout change is needed when substituting between them within voltage design margins.

Does PUAD8BH require special handling for moisture sensitivity?

No-PUAD8BH is rated Moisture Sensitivity Level 1 (MSL-1) per J-STD-020, meaning it has unlimited floor life and requires no baking prior to reflow soldering. This simplifies SMT assembly and eliminates dry-pack storage costs, supporting high-volume automotive and industrial manufacturing without process overhead.

What is the reverse recovery charge (Q_rr) specification for PUAD8BH?

The PUAD8BH specifies a typical reverse recovery charge (Q_rr) of 35 nC under conditions of I_F = 8.0 A, di/dt = 200 A/µs, and V_R = 100 V. This value is measured and guaranteed per the manufacturer's test methodology and is essential for calculating switching loss and optimizing snubber design in high-frequency converters.

How does PUAD8BH's forward voltage compare at elevated junction temperatures?

PUAD8BH exhibits negative temperature coefficient behavior: V_F decreases with rising junction temperature. At I_F = 8 A, V_F is 0.92 V max at 25°C and drops to 0.77 V at 125°C. This characteristic improves thermal stability in parallel configurations and reduces conduction loss at operating temperature-key for automotive thermal management.

PUAD8BH Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

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

Current - Average Rectified (Io):: 8A

Voltage - Forward (Vf) (Max) @ If:: 1 V @ 8 A

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

Reverse Recovery Time (trr):: 25 ns

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

Capacitance @ Vr, F:: 101pF @ 4V, 1MHz

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: ThinDPAK

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

PUAD8BH FAQ

1.How can I place an order for PUAD8BH through Aetrix?

Please submit a Request for Quotation (RFQ) for PUAD8BH 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 PUAD8BH reliable?

The price and inventory of PUAD8BH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PUAD8BH is usually 5 days.

3.What payment methods are accepted for PUAD8BH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PUAD8BH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PUAD8BH?

PUAD8BH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PUAD8BH 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 PUAD8BH?

For technical support, including PUAD8BH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PUAD8BH requirements.

6.How does Aetrix verify that PUAD8BH is sourced from the original manufacturer or authorized distributors?

All PUAD8BH 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 PUAD8BH meets industry standards.

7.What is the process for return or replacement of PUAD8BH?

All PUAD8BH units undergo pre-shipment inspection (PSI). If there is an issue with PUAD8BH, 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 PUAD8BH part is unused and in its original packaging.

Return procedure for PUAD8BH:

1.Submit a request within 90 days.

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

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