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

Taiwan Semiconductor Corporation PU3BA

Name: PU3BA
Brand: Taiwan Semiconductor Corporation
SKU: PU3BA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PU3BA

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: PU3BA.pdf

Description:: 25NS, 3A, 100V, ULTRA FAST RECOV

Quantity:: RFQ Add To RFQ list

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Inventory:14,990

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Product details

Overview

PU3BA from Taiwan Semiconductor is a 100V ultra-fast recovery surface-mount rectifier diode in DO-214AC (SMA) package, rated for 3A average forward current, 85A surge current, and 25ns reverse recovery time. It delivers low forward voltage (0.86V at 3A, 25°C) and low leakage (<2µA at 25°C), optimized for high-frequency switching power supplies and snubber circuits.

For engineers reviewing the PU3BA datasheet, PU3BA pinout, PU3BA application, or PU3BA equivalent, key selection criteria include its 100V V_RRM, ultra-fast trr ≤25ns, thermal resistance R_θJL = 19°C/W, and compatibility with automated SMT assembly on standard PCB pads.

Technical Context

The PU3BA employs planar junction technology to achieve fast soft recovery characteristics with minimal reverse recovery charge (Q_rr = 51nC) and low junction capacitance (C_J = 47pF at 4V). Its single-die configuration supports unidirectional conduction with cathode band polarity marking.

Designed for operation up to 175°C junction temperature, the device uses matte tin-plated leads compliant with J-STD-002 solderability and meets JESD201 Class 2 whisker resistance. Thermal performance is characterized on a 5mm × 5mm copper pad test board.

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 flyback or snubber clamping.
I_F	3 A - Continuous average forward current at T_L = 75°C; determines steady-state power handling capability.
t_rr	25 ns - Reverse recovery time under IF = 0.5A, IR = 1.0A, Irr = 0.25A; enables >1 MHz switching without excessive switching loss.
V_F	0.86 V @ 3A, 25°C - Forward voltage drop; directly impacts conduction loss and thermal rise in high-current paths.
R_θJL	19 °C/W - Junction-to-lead thermal resistance; enables direct heat transfer to PCB copper, critical for compact layout thermal management.
Q_rr	51 nC - Reverse recovery charge; lower value reduces EMI and diode-induced voltage spikes in hard-switched topologies.
I_R	<2 µA @ 100V, 25°C - Reverse leakage current; ensures minimal standby power loss in high-impedance bias networks.

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode indicated by molded band. Weight: 0.059 g. Moisture sensitivity level: J-STD-020 Level 1.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side (e.g., switch node in flyback secondary); requires adequate copper area for thermal dissipation.
Cathode	Forward current exit / reverse blocking terminal	Marked by visible band; ties to output rail or clamp node; must maintain clearance from adjacent high-dv/dt traces.

Key Features

Feature	Design Value
Ultra-fast recovery (t_rr ≤25 ns)	Enables efficient operation in 500 kHz–1 MHz SMPS without significant switching loss penalty or snubber complexity.
Low V_F (0.86 V @ 3A)	Reduces conduction loss by ~15% vs. standard FRDs with comparable I_F, lowering thermal stress on PCB copper.
R_θJL = 19 °C/W	Allows direct thermal path from die to PCB lead, supporting higher power density than devices relying solely on R_θJA.
RoHS & halogen-free	Meets IEC 61249-2-21 and UL 94V-0 requirements for environmentally compliant industrial and consumer end equipment.
J-STD-020 Level 1 MSL	Permits unlimited floor life and reflow without baking, simplifying SMT line logistics and reducing handling cost.

Applications

Switch-Mode Power Supply Output Rectification	Active Clamp Snubber Circuit
Use Scenario: Secondary-side rectification in 100–300W offline flyback or forward converters operating at 500 kHz–1 MHz. IC Role / Device Role / Timing Role: Unidirectional current steering and energy transfer during switch off-time; recovers before next switching cycle begins. Use Value: 25ns t_rr and 51nC Q_rr minimize voltage overshoot and reduce need for RC snubbers, improving efficiency by ≥0.8% at full load.	Use Scenario: Clamp diode in active clamp forward or LLC resonant converters where fast turn-off and low stored charge are critical. IC Role / Device Role / Timing Role: Provides low-loss path for magnetizing current reset; blocks clamp capacitor voltage during main switch conduction. Use Value: Low V_F (0.86V) reduces clamp loss, while fast soft recovery prevents oscillatory ringing during clamp capacitor discharge.
DC/DC Converter Isolation Barrier	High-Frequency Inverter Freewheeling Path
Use Scenario: Isolated 12V–48V intermediate bus converter supplying FPGA or ASIC core rails in telecom infrastructure. IC Role / Device Role / Timing Role: Synchronous rectifier alternative in cost-sensitive designs; conducts only during transformer secondary voltage polarity window. Use Value: 100V V_RRM safely withstands reflected transients; 175°C T_JMAX supports operation in sealed enclosures with limited airflow.	Use Scenario: Freewheeling path in 20–50 kHz motor drive half-bridges using SiC MOSFETs, where diode reverse recovery must not trigger shoot-through. IC Role / Device Role / Timing Role: Provides controlled current recirculation during dead-time; suppresses voltage spikes induced by stray inductance. Use Value: Soft recovery profile and low IRM (4.9A) prevent dynamic overvoltage events that could exceed MOSFET V_DSS rating.

Switch-Mode Power Supply Output Rectification

Active Clamp Snubber Circuit

Use Scenario: Secondary-side rectification in 100–300W offline flyback or forward converters operating at 500 kHz–1 MHz.

IC Role / Device Role / Timing Role: Unidirectional current steering and energy transfer during switch off-time; recovers before next switching cycle begins.

Use Value: 25ns t_rr and 51nC Q_rr minimize voltage overshoot and reduce need for RC snubbers, improving efficiency by ≥0.8% at full load.

Use Scenario: Clamp diode in active clamp forward or LLC resonant converters where fast turn-off and low stored charge are critical.

IC Role / Device Role / Timing Role: Provides low-loss path for magnetizing current reset; blocks clamp capacitor voltage during main switch conduction.

Use Value: Low V_F (0.86V) reduces clamp loss, while fast soft recovery prevents oscillatory ringing during clamp capacitor discharge.

DC/DC Converter Isolation Barrier

High-Frequency Inverter Freewheeling Path

Use Scenario: Isolated 12V–48V intermediate bus converter supplying FPGA or ASIC core rails in telecom infrastructure.

IC Role / Device Role / Timing Role: Synchronous rectifier alternative in cost-sensitive designs; conducts only during transformer secondary voltage polarity window.

Use Value: 100V V_RRM safely withstands reflected transients; 175°C T_JMAX supports operation in sealed enclosures with limited airflow.

Use Scenario: Freewheeling path in 20–50 kHz motor drive half-bridges using SiC MOSFETs, where diode reverse recovery must not trigger shoot-through.

IC Role / Device Role / Timing Role: Provides controlled current recirculation during dead-time; suppresses voltage spikes induced by stray inductance.

Use Value: Soft recovery profile and low IRM (4.9A) prevent dynamic overvoltage events that could exceed MOSFET V_DSS rating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L06S (STMicroelectronics)	600V V_RRM, 3A I_F, t_rr = 35ns, VF = 0.95V @ 3A	Higher voltage rating but slower recovery and higher V_F; suited for 400V+ PFC stages, not optimal for 100V snubbers.	Select PU3BA when 100V rating, <25ns t_rr, and lowest conduction loss are prioritized in compact high-frequency designs.
ES3B (Vishay)	100V V_RRM, 3A I_F, t_rr = 35ns, VF = 0.92V @ 3A, DO-214AA package	Same voltage/current rating but slower recovery and higher V_F; larger DO-214AA footprint increases board area.	Choose PU3BA for tighter layouts requiring DO-214AC (SMA) size and superior speed-efficiency trade-off.

Compared with STTH3L06S and ES3B, the PU3BA offers the fastest recovery (≤25ns), lowest forward voltage (0.86V), and smallest footprint (DO-214AC), making it optimal for space-constrained, high-frequency rectification where switching loss and thermal density are critical.

Availability

PU3BA is available at Aetrix Electronics and suitable for high-frequency switching power supplies, DC/DC converters, and active clamp snubber circuits requiring stable component supply, consistent parametric performance, and RoHS-compliant manufacturing.

Supply support for PU3BA 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 semiconductor manufacturer specializing in discrete power devices, including rectifiers, TVS diodes, and MOSFETs, with global distribution and AEC-Q200 qualified lines.

The PU3BA belongs to TSC's ultra-fast rectifier product line, engineered specifically for high-efficiency, high-frequency AC/DC and isolated DC/DC conversion in industrial, computing, and telecom power systems.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for PU3BA?

The PU3BA has a maximum repetitive peak reverse voltage (V_RRM) of 100 V, as specified in the Absolute Maximum Ratings table. This rating is fixed for the PU3BA variant and differs from the PU3DA (200 V). Exceeding 100 V in continuous reverse bias risks irreversible breakdown. The PU3BA datasheet confirms this value under TA = 25°C with no derating required up to TJ = 125°C.

What is the reverse recovery time (t_rr) of PU3BA and under what test conditions?

The PU3BA reverse recovery time (t_rr) is 25 ns maximum, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A per the Electrical Specifications table. An alternate condition (IF = 1.0 A, di/dt = 50 A/µs, VR = 30 V) yields 31 ns typical. These values are confirmed in the A2210 revision datasheet and reflect the device's ultra-fast soft-recovery behavior critical for high-frequency designs.

Is PU3BA compatible with lead-free reflow soldering processes?

Yes, PU3BA is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its moisture sensitivity level is J-STD-020 Level 1-meaning it can be subjected to standard Pb-free reflow profiles (peak 260°C) without baking or special handling. The device's UL 94V-0 molding compound also withstands repeated thermal excursions.

What package type does PU3BA use and how is polarity identified?

The PU3BA uses the DO-214AC (SMA) surface-mount package. Polarity is identified by a molded cathode band on the body, aligned with the cathode terminal. The anode is the unmarked end. This marking matches the mechanical drawing in the A2210 datasheet and is visible under standard AOI inspection. The SMA footprint requires 5 mm × 5 mm Cu pad per lead for optimal thermal performance.

Does PU3BA have a specified junction-to-case thermal resistance (R_θJC)?

Yes, the PU3BA has a specified junction-to-case thermal resistance (R_θJC) of 23 °C/W, documented in the Thermal Performance section of the A2210 datasheet. This value is measured with the device mounted on a standard 5 mm × 5 mm copper pad test board and supports thermal modeling for PCB-level heatsinking in high-power-density applications.

PU3BA Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AC, SMA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

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

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 930 mV @ 3 A

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

Reverse Recovery Time (trr):: 25 ns

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

Capacitance @ Vr, F:: 47pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

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

PU3BA FAQ

1.How can I place an order for PU3BA through Aetrix?

Please submit a Request for Quotation (RFQ) for PU3BA 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 PU3BA reliable?

The price and inventory of PU3BA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PU3BA is usually 5 days.

3.What payment methods are accepted for PU3BA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PU3BA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PU3BA?

PU3BA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PU3BA 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 PU3BA?

For technical support, including PU3BA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PU3BA requirements.

6.How does Aetrix verify that PU3BA is sourced from the original manufacturer or authorized distributors?

All PU3BA 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 PU3BA meets industry standards.

7.What is the process for return or replacement of PU3BA?

All PU3BA units undergo pre-shipment inspection (PSI). If there is an issue with PU3BA, 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 PU3BA part is unused and in its original packaging.

Return procedure for PU3BA:

1.Submit a request within 90 days.

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

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