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

Taiwan Semiconductor Corporation SK32A

Name: SK32A
Brand: Taiwan Semiconductor Corporation
SKU: SK32A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SK32A

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: SK32A.pdf

Description:: DIODE SCHOTTKY 20V 3A DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:8,634

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Product details

Overview

SK32A from Taiwan Semiconductor is a 3A, 20V Schottky barrier surface-mount rectifier in DO-214AC (SMA) package, optimized for high-efficiency switching mode power supplies and adapters. It delivers low forward voltage (0.55 V max at 3 A, 25°C), high surge current capability (70 A IFSM), and operates up to 150°C junction temperature.

For engineers reviewing the SK32A datasheet, SK32A pinout, SK32A application, or SK32A equivalent, key selection criteria include forward voltage drop at rated current, reverse leakage at elevated temperature (10 mA at 100°C), thermal resistance (R_θJL = 25°C/W), and DO-214AC mechanical compatibility with automated SMT placement.

Technical Context

The SK32A employs a single-die Schottky barrier structure enabling fast switching with negligible reverse recovery charge, making it suitable for high-frequency DC/DC converters. Its guard ring design enhances ruggedness against transient over-voltage events without requiring external snubbers.

Rated for repetitive peak reverse voltage of 20 V and RMS reverse voltage of 14 V, the device supports continuous forward conduction up to 3 A with derating above 25°C ambient, per its forward current derating curve. Thermal performance is defined by R_θJL = 25°C/W and R_θJA = 66°C/W under standard PCB mounting conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	20 V - Maximum blocking voltage before breakdown; sets upper limit for input/output rail separation in buck or flyback topologies
I_F	3 A - Continuous average forward current rating; defines minimum heatsinking requirement for sustained load operation
V_F (max)	0.55 V @ 3 A, 25°C - Low conduction loss directly reduces power dissipation and improves system efficiency
I_FSM	70 A - Peak non-repetitive surge current handling; enables robust startup and fault tolerance in SMPS
T_J (max)	150°C - Maximum junction temperature; determines allowable thermal margin for enclosure and board layout
R_θJL	25°C/W - Junction-to-lead thermal resistance; critical for estimating die temperature rise when lead is used as heat path
I_R @ 100°C	10 mA - Reverse leakage at elevated temperature; impacts standby power and thermal runaway risk in parallel configurations

Pinout & Package

Package: DO-214AC (SMA), surface-mount plastic case with cathode band polarity marking. Matte tin-plated leads meet J-STD-002 solderability requirements and JESD 201 Class 2 whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter); must handle full 3 A DC + ripple
Cathode	Forward current exit / reverse blocking terminal	Connected to output rail or filter capacitor; marked by visible band; carries return current and blocks reverse voltage

Key Features

Feature	Design Value
Low forward voltage drop	0.55 V max at 3 A ensures <1.7 W conduction loss, reducing thermal stress in compact adapters
Guard ring over-voltage protection	Integrated edge termination prevents premature avalanche failure during line transients in AC-DC front-ends
High surge current capability	70 A IFSM supports repeated cold-start surges without degradation in 60 Hz line-synchronized applications
Moisture sensitivity level 1	No bake required prior to reflow; compatible with standard SMT assembly lines without dry-pack handling
RoHS and halogen-free compliance	Meets IPC-1752A material declaration requirements for industrial and consumer end-equipment

Applications

Switching Mode Power Supply (SMPS)	AC-DC Adapter
Use Scenario: Secondary-side rectification in 12–24 V output flyback or forward converters delivering up to 36 W. IC Role / Device Role / Timing Role: Uncontrolled rectifier replacing slower PN diodes to minimize conduction loss and improve efficiency. Use Value: 0.55 V V_F reduces rectifier loss by ~40% vs. comparable 1N5822, directly improving full-load efficiency by 1.2–1.8%.	Use Scenario: Output rectification in wall-mounted USB-C PD adapters with 5–20 V outputs. IC Role / Device Role / Timing Role: High-current, low-loss freewheeling path during synchronous rectifier off-time or in quasi-resonant designs. Use Value: R_θJL = 25°C/W enables direct thermal coupling to copper pour, allowing >2.5 W dissipation without external heatsink.
LED Lighting Driver	DC-DC Converter
Use Scenario: Output rectification in constant-current LED drivers for commercial downlights (24–48 V, 0.7–1.5 A). IC Role / Device Role / Timing Role: Low-noise, zero-recovery rectifier minimizing EMI generation in high-frequency (>100 kHz) buck-derived topologies. Use Value: Absence of reverse recovery charge eliminates switching spikes, simplifying EMI filter design and reducing Y-capacitor count.	Use Scenario: Input or output rectification in isolated 48 V–12 V telecom DC-DC modules operating at 250–500 kHz. IC Role / Device Role / Timing Role: Fast-recovery, low-loss rectifier supporting high-frequency operation without thermal runaway. Use Value: 10 mA I_R at 100°C ensures stable performance across extended industrial temperature range without derating.

Switching Mode Power Supply (SMPS)

AC-DC Adapter

Use Scenario: Secondary-side rectification in 12–24 V output flyback or forward converters delivering up to 36 W.

IC Role / Device Role / Timing Role: Uncontrolled rectifier replacing slower PN diodes to minimize conduction loss and improve efficiency.

Use Value: 0.55 V V_F reduces rectifier loss by ~40% vs. comparable 1N5822, directly improving full-load efficiency by 1.2–1.8%.

Use Scenario: Output rectification in wall-mounted USB-C PD adapters with 5–20 V outputs.

IC Role / Device Role / Timing Role: High-current, low-loss freewheeling path during synchronous rectifier off-time or in quasi-resonant designs.

Use Value: R_θJL = 25°C/W enables direct thermal coupling to copper pour, allowing >2.5 W dissipation without external heatsink.

LED Lighting Driver

DC-DC Converter

Use Scenario: Output rectification in constant-current LED drivers for commercial downlights (24–48 V, 0.7–1.5 A).

IC Role / Device Role / Timing Role: Low-noise, zero-recovery rectifier minimizing EMI generation in high-frequency (>100 kHz) buck-derived topologies.

Use Value: Absence of reverse recovery charge eliminates switching spikes, simplifying EMI filter design and reducing Y-capacitor count.

Use Scenario: Input or output rectification in isolated 48 V–12 V telecom DC-DC modules operating at 250–500 kHz.

IC Role / Device Role / Timing Role: Fast-recovery, low-loss rectifier supporting high-frequency operation without thermal runaway.

Use Value: 10 mA I_R at 100°C ensures stable performance across extended industrial temperature range without derating.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay SS32	V_F = 0.52 V (typ) at 3 A, slightly lower leakage (500 μA @ 25°C), same DO-214AC package	Preferred where ultra-low V_F dominates over cost; identical thermal footprint	Select SS32 if sub-50 mV V_F reduction justifies sourcing from alternate vendor
ON Semiconductor SB320	V_F = 0.54 V (max) at 3 A, higher I_R (2 mA @ 100°C), same 20 V V_RRM and DO-214AC	Suitable for cost-sensitive consumer adapters where 10 mA vs. 2 mA leakage is acceptable	Choose SB320 for price-driven BOMs with relaxed thermal margins

Compared with SK32A, SS32 offers marginally better conduction efficiency but lacks the documented guard ring protection, while SB320 trades higher reverse leakage for broader distribution channel access-both require no PCB changes but differ in thermal reliability under sustained 100°C operation.

Availability

SK32A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and LED lighting drivers requiring stable component supply with consistent DO-214AC packaging and RoHS/halogen-free compliance.

Supply support for SK32A 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 management and industrial markets since 1979.

The SK32A belongs to TSC's SKx2A–SKx20A Schottky rectifier family, engineered specifically for high-efficiency, high-reliability secondary-side rectification in compact, thermally constrained AC-DC and DC-DC systems.

FAQ

What is the maximum junction temperature rating for the SK32A?

The SK32A has a maximum junction temperature (T_J) rating of +150°C. This allows reliable operation in enclosed power supplies and LED drivers where ambient temperatures may reach 85°C, provided thermal design maintains junction temperature below this limit. The SK32A's R_θJL of 25°C/W supports effective heat transfer through the leads into PCB copper.

Does the SK32A have a guard ring, and what function does it serve?

Yes, the SK32A incorporates a guard ring structure explicitly noted in its features. This design element provides enhanced edge termination to suppress premature avalanche breakdown during voltage transients, improving ruggedness in applications like AC-DC adapters exposed to line surges. The guard ring is integral to the SK32A's die construction and contributes to its specified dV/dt rating of 10,000 V/µs.

What is the forward voltage specification for the SK32A at full rated current?

The SK32A has a maximum forward voltage (V_F) of 0.55 V at 3 A forward current and 25°C junction temperature, per its Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) to avoid self-heating effects. At higher temperatures or continuous DC, V_F decreases slightly due to negative temperature coefficient of Schottky diodes.

Is the SK32A suitable for use in automotive applications?

The SK32A is not qualified to AEC-Q101 or automotive-grade reliability standards. While its 150°C T_J rating and robust surge capability may appear suitable, Taiwan Semiconductor explicitly states these devices are "not designed for use in medical, life-saving, or life-sustaining applications," and no automotive qualification data is published for the SK32A. For automotive use, consult TSC's AEC-Q101-certified alternatives.

What packaging and reel quantity is offered for the SK32A?

The SK32A is supplied in DO-214AC (SMA) package on 7,500-unit tape-and-reel format, as confirmed in the Ordering Information section. This standard SMT packaging supports high-speed pick-and-place assembly and aligns with JEDEC-compliant reel dimensions. No alternative packaging (e.g., bulk or ammo pack) is listed for the SK32A in the official documentation.

SK32A Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AC, SMA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 20 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 550 mV @ 3 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 500 µA @ 20 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

Operating Temperature - Junction:: -55°C ~ 150°C

SK32A FAQ

1.How can I place an order for SK32A through Aetrix?

Please submit a Request for Quotation (RFQ) for SK32A 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 SK32A reliable?

The price and inventory of SK32A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK32A is usually 5 days.

3.What payment methods are accepted for SK32A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK32A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SK32A?

SK32A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SK32A 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 SK32A?

For technical support, including SK32A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK32A requirements.

6.How does Aetrix verify that SK32A is sourced from the original manufacturer or authorized distributors?

All SK32A 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 SK32A meets industry standards.

7.What is the process for return or replacement of SK32A?

All SK32A units undergo pre-shipment inspection (PSI). If there is an issue with SK32A, 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 SK32A part is unused and in its original packaging.

Return procedure for SK32A:

1.Submit a request within 90 days.

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

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