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

Taiwan Semiconductor Corporation PUAD8B

Name: PUAD8B
Brand: Taiwan Semiconductor Corporation
SKU: PUAD8B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PUAD8B

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: PUAD8B.pdf

Description:: 25NS, 8A, 100V, ULTRA FAST RECOV

Quantity:: RFQ Add To RFQ list

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Inventory:4,500

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Product details

Overview

PUAD8B from Taiwan Semiconductor is an 8A, 100V ultra-fast surface-mount rectifier in ThinDPAK package, featuring 25ns reverse recovery time, 0.92V forward voltage at 8A/25°C, and 150A surge current capability. It serves as a high-efficiency output rectifier in DC/DC converters and snubber circuits for switch-mode power supplies.

For engineers reviewing the PUAD8B datasheet, PUAD8B pinout, PUAD8B application, or PUAD8B equivalent, key selection criteria include its 100V V_RRM, 3.5°C/W junction-to-lead thermal resistance, 101pF junction capacitance at 1MHz, and J-STD-020 Level 1 moisture sensitivity rating.

Technical Context

The PUAD8B employs planar silicon technology to achieve ultra-fast switching with low Q_rr (35nC) and low trr (19–25ns), enabling high-frequency operation up to several hundred kHz. Its single-die configuration and ThinDPAK thermal design support efficient heat dissipation when mounted on an aluminum heatsink.

Electrical behavior is characterized by temperature-dependent forward voltage (0.77V at 8A/125°C), low leakage (≤4µA at 125°C), and stable junction capacitance (101pF). The device meets RoHS and halogen-free requirements and passes JESD201 Class 2 whisker testing.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - Maximum repetitive reverse voltage before breakdown; defines safe operating range in DC/DC output stage
I_F	8 A - Continuous forward current rating at T_C = 110°C; determines steady-state power handling
I_FSM	150 A - Non-repetitive surge current (8.3ms); supports inrush and fault transient resilience
t_rr	19–25 ns - Reverse recovery time under defined test conditions; enables >500kHz switching without excessive losses
R_θJL	3.5 °C/W - Junction-to-lead thermal resistance; allows direct thermal path to PCB copper for passive cooling
V_F @ 8A/25°C	0.92 V - Forward voltage drop; directly impacts conduction loss and efficiency in high-current paths
Q_rr	35 nC - Reverse recovery charge; critical for EMI and switching loss calculation in hard-switched topologies

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1 (Anode)	Input current terminal	Connects to switching node or transformer secondary; carries full load current during conduction
2 (Cathode)	Output current terminal	Connects to output filter capacitor; polarity marked by cathode band on package
3 (Tab / Exposed Pad)	Thermal & electrical common	Internally connected to cathode; must be soldered to large copper pour for thermal management and low-inductance return path

Key Features

Feature	Design Value
Ultra-fast recovery (t_rr ≤ 25ns)	Reduces switching losses and EMI in high-frequency SMPS designs above 200kHz
Low V_F (0.92V @ 8A/25°C)	Minimizes conduction loss and thermal stress in compact, high-current DC/DC outputs
ThinDPAK package with exposed cathode pad	Enables <3.5°C/W thermal resistance to PCB copper, supporting high-power density layouts
J-STD-020 Level 1 moisture sensitivity	Eliminates pre-bake requirement for automated SMT assembly, reducing manufacturing cost and risk
RoHS-compliant & halogen-free	Meets global environmental compliance mandates without compromising thermal or electrical performance

Applications

Server VRM Output Rectification	Industrial DC/DC Converter
Use Scenario: High-current, high-efficiency 12V→1V conversion in server CPU voltage regulator modules. IC Role / Device Role / Timing Role: Primary synchronous rectifier replacement in secondary-side topology, conducting continuous 8A load current. Use Value: 0.92V V_F and 35nC Q_rr reduce conduction + switching losses versus standard fast rectifiers, improving VRM efficiency by ~0.8% at full load.	Use Scenario: Isolated 48V→12V DC/DC supply in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Output rectifier in forward or flyback converter, operating at 200–500kHz switching frequency. Use Value: 25ns t_rr and 101pF C_J suppress ringing and minimize EMI filter size, easing EMC certification.
Snubber Network Diode	Telecom Power Supply Rectification
Use Scenario: Clamp diode in RCD snubber across MOSFETs in telecom AC/DC front-end PFC stages. IC Role / Device Role / Timing Role: Fast turn-off clamp element absorbing inductive energy during MOSFET turn-off transitions. Use Value: 150A I_FSM withstands peak snubber currents; 19ns t_rr prevents reverse conduction during rapid voltage reversal.	Use Scenario: Secondary-side rectification in 3kW telecom rectifier modules with forced-air cooling. IC Role / Device Role / Timing Role: High-reliability rectifier in parallel-output configurations requiring stable thermal performance. Use Value: 175°C T_JMAX and 3.5°C/W R_θJL enable sustained 8A operation at elevated ambient temperatures without derating.

Server VRM Output Rectification

Industrial DC/DC Converter

Use Scenario: High-current, high-efficiency 12V→1V conversion in server CPU voltage regulator modules.

IC Role / Device Role / Timing Role: Primary synchronous rectifier replacement in secondary-side topology, conducting continuous 8A load current.

Use Value: 0.92V V_F and 35nC Q_rr reduce conduction + switching losses versus standard fast rectifiers, improving VRM efficiency by ~0.8% at full load.

Use Scenario: Isolated 48V→12V DC/DC supply in programmable logic controllers and motor drives.

IC Role / Device Role / Timing Role: Output rectifier in forward or flyback converter, operating at 200–500kHz switching frequency.

Use Value: 25ns t_rr and 101pF C_J suppress ringing and minimize EMI filter size, easing EMC certification.

Snubber Network Diode

Telecom Power Supply Rectification

Use Scenario: Clamp diode in RCD snubber across MOSFETs in telecom AC/DC front-end PFC stages.

IC Role / Device Role / Timing Role: Fast turn-off clamp element absorbing inductive energy during MOSFET turn-off transitions.

Use Value: 150A I_FSM withstands peak snubber currents; 19ns t_rr prevents reverse conduction during rapid voltage reversal.

Use Scenario: Secondary-side rectification in 3kW telecom rectifier modules with forced-air cooling.

IC Role / Device Role / Timing Role: High-reliability rectifier in parallel-output configurations requiring stable thermal performance.

Use Value: 175°C T_JMAX and 3.5°C/W R_θJL enable sustained 8A operation at elevated ambient temperatures without derating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH8R06D	600V V_RRM, 8A I_F, 25ns t_rr, TO-252 package, higher V_F (1.15V @ 8A)	Higher voltage rating suits 400V bus applications; less efficient at 100V due to higher V_F	Select when system requires >100V reverse margin or operates at higher input voltages
VS-8EWH06FN-M3	600V V_RRM, 8A I_F, 30ns t_rr, same ThinDPAK, 0.98V V_F @ 8A	Slightly slower recovery and higher V_F; optimized for general-purpose fast recovery, not ultra-fast	Choose where cost sensitivity outweighs marginal efficiency gain of PUAD8B

Compared with STTH8R06D and VS-8EWH06FN-M3, the PUAD8B delivers lower conduction loss at 100V systems and tighter trr consistency, making it optimal for high-efficiency, high-frequency DC/DC where voltage margin is constrained.

Availability

PUAD8B is available at Aetrix Electronics and suitable for server VRMs, industrial DC/DC converters, telecom power supplies, and snubber networks requiring stable component supply and consistent thermal performance.

Supply support for PUAD8B 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 power electronics markets since 1979.

The PUAD8B belongs to TSC's ultra-fast rectifier product line, engineered specifically for high-frequency, high-efficiency power conversion in space-constrained applications where thermal management and switching loss minimization are critical.

FAQ

What is the maximum junction temperature rating for the PUAD8B?

The PUAD8B has a maximum junction temperature (T_JMAX) of +175°C, verified per absolute maximum ratings in the official datasheet. This rating enables reliable operation in high-ambient environments such as enclosed industrial power supplies or telecom rectifiers. Thermal design must ensure actual junction temperature remains below this limit using the specified R_θJL = 3.5°C/W and appropriate PCB copper area. The PUAD8B maintains rated performance up to this temperature.

Does the PUAD8B have a cathode marking, and how is polarity identified?

Yes, the PUAD8B uses a visible cathode band on the molded plastic body to indicate polarity - the banded end corresponds to the cathode terminal (Pin 2). This marking aligns with JEDEC TO-252 standards and is clearly shown in the official package outline drawing. Correct orientation is essential for functional operation, as reverse bias beyond 100V will cause breakdown. The PUAD8B's polarity identification is consistent across all production lots.

What is the reverse recovery time (t_rr) specification for the PUAD8B, and under what test conditions?

The PUAD8B specifies t_rr = 19ns (typical) and ≤25ns (max), measured under two defined conditions: (1) IF = 0.5A, IR = 1.0A, Irr = 0.25A; and (2) IF = 1.0A, di/dt = 50A/µs, VR = 30V. These values confirm its classification as an ultra-fast rectifier. The PUAD8B's t_rr performance is validated in the Electrical Specifications table of the A2302 datasheet revision.

Is the PUAD8B suitable for lead-free reflow soldering, and what is its moisture sensitivity level?

Yes, the PUAD8B is qualified for lead-free reflow soldering per J-STD-020, with Moisture Sensitivity Level (MSL) = 1 - meaning unlimited floor life at ≤30°C/60% RH and no bake requirement prior to assembly. Its matte tin-plated leads meet J-STD-002 solderability standards. This makes the PUAD8B compatible with standard SMT lines without process modification. The PUAD8B's MSL rating is explicitly stated in the Features section of the datasheet.

How does the PUAD8B's forward voltage compare at different temperatures and currents?

At 8A and 25°C, the PUAD8B exhibits V_F = 0.92V (typical), dropping to 0.77V at 125°C due to negative temperature coefficient of silicon diodes. At 4A, V_F is 0.84V (25°C) and 0.68V (125°C). These values are measured under pulse conditions (PW = 0.3ms) and reflect real conduction loss behavior across operating temperature ranges. The PUAD8B's V_F characteristics are fully documented in the Electrical Specifications table.

PUAD8B 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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: ThinDPAK

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

PUAD8B FAQ

1.How can I place an order for PUAD8B through Aetrix?

Please submit a Request for Quotation (RFQ) for PUAD8B 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 PUAD8B reliable?

The price and inventory of PUAD8B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PUAD8B is usually 5 days.

3.What payment methods are accepted for PUAD8B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PUAD8B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PUAD8B?

PUAD8B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PUAD8B 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 PUAD8B?

For technical support, including PUAD8B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PUAD8B requirements.

6.How does Aetrix verify that PUAD8B is sourced from the original manufacturer or authorized distributors?

All PUAD8B 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 PUAD8B meets industry standards.

7.What is the process for return or replacement of PUAD8B?

All PUAD8B units undergo pre-shipment inspection (PSI). If there is an issue with PUAD8B, 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 PUAD8B part is unused and in its original packaging.

Return procedure for PUAD8B:

1.Submit a request within 90 days.

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

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