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

Taiwan Semiconductor Corporation SK14B

Name: SK14B
Brand: Taiwan Semiconductor Corporation
SKU: SK14B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SK14B

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: SK14B.pdf

Description:: DIODE SCHOTTKY 40V 1A DO214AA

Quantity:: RFQ Add To RFQ list

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Inventory:3,470

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Product details

Overview

SK14B from Taiwan Semiconductor is a 1 A, 40 V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, featuring 0.50 V forward voltage at 1 A and 500 µA reverse leakage at 25°C, optimized for high-efficiency DC/DC conversion in compact power supplies.

For engineers reviewing the SK14B datasheet, SK14B pinout, SK14B application, or SK14B equivalent, key selection criteria include its 40 V repetitive peak reverse voltage, 30 A surge capability, 125°C maximum junction temperature, low VF for reduced conduction loss, and SMB package compatibility with automated assembly.

Technical Context

The SK14B operates as a single-die Schottky rectifier with guard ring overvoltage protection and JESD201 Class 2 whisker resistance. Its thermal design supports 25°C/W junction-to-lead resistance and enables stable operation up to 125°C junction temperature under continuous 1 A forward current.

It delivers 10,000 V/µs critical dV/dt rating and meets RoHS and halogen-free requirements per IEC 61249-2-21. The cathode band polarity marking and matte tin-plated leads ensure reliable soldering per J-STD-002.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum repetitive reverse blocking voltage before breakdown; defines safe operating range in flyback or buck output stages
I_F	1 A - Continuous forward current rating; determines steady-state power handling without derating below 125°C
I_FSM	30 A - Non-repetitive surge current (8.3 ms half-sine); supports inrush and transient overload tolerance
V_F @ 1 A, 25°C	0.50 V - Low forward drop reduces conduction losses and improves efficiency in high-frequency SMPS
I_R @ 40 V, 25°C	500 µA - Reverse leakage level affecting standby power and thermal runaway risk in parallel configurations
T_J max	125°C - Maximum junction temperature limit; constrains thermal design margin in enclosed adapters or lighting drivers
R_θJL	25°C/W - Junction-to-lead thermal resistance; enables direct PCB copper pour sizing for thermal management

Pinout & Package

Package: DO-214AA (SMB), surface-mount plastic case with cathode band polarity indicator, 0.093 g weight, UL 94V-0 molding compound, and matte tin-plated leads.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter); requires low-inductance layout
Cathode	Forward current exit / reverse-blocking terminal	Marked by band; ties to output rail or ground return; defines voltage reference for reverse bias condition

Key Features

Feature	Design Value
Guard ring structure	Enhances ruggedness against voltage transients and localized edge breakdown in high-dV/dt environments
Moisture sensitivity level 1	Eliminates bake requirement prior to reflow; supports standard SMT line handling without dry pack
High surge current capability (30 A)	Withstands repeated input surges and output short-circuit events without parametric shift or failure
Low forward voltage (0.50 V)	Reduces power dissipation by ~30% vs. comparable 1 A silicon diodes, lowering heatsink demand in space-constrained adapters
Halogen-free construction	Complies with IEC 61249-2-21; eliminates corrosive gas emission during board rework or end-of-life incineration

Applications

Switching Mode Power Supply (SMPS)	AC-DC Adapters
Use Scenario: Output rectification in 5–24 V, 10–30 W offline flyback converters. IC Role / Device Role / Timing Role: Freewheeling diode conducting during MOSFET off-time; defines output voltage ripple and efficiency floor. Use Value: 0.50 V V_F minimizes conduction loss at 1 A load, improving full-load efficiency by ≥1.2% versus standard silicon rectifiers.	Use Scenario: Secondary-side rectification in universal-input wall adapters for consumer electronics. IC Role / Device Role / Timing Role: Unidirectional current path converting transformer AC to regulated DC; subjected to repeated 60 Hz line-frequency surges. Use Value: 30 A I_FSM withstands cold-start inrush without degradation, extending adapter field life beyond 50,000 cycles.
LED Lighting Drivers	DC-DC Buck Converters
Use Scenario: Constant-current output rectification in isolated LED drivers for commercial downlights. IC Role / Device Role / Timing Role: Synchronous rectifier alternative in quasi-resonant topologies; handles 100 kHz–500 kHz switching. Use Value: 125°C T_J max allows operation in thermally dense LED modules without forced air, reducing BOM cost.	Use Scenario: High-frequency synchronous rectification replacement in 3.3 V/5 V point-of-load converters. IC Role / Device Role / Timing Role: Low-loss freewheeling path during high-side switch off-time; directly impacts light-load efficiency. Use Value: 500 µA I_R at 25°C limits standby leakage, enabling compliance with Energy Star Level VI no-load power requirements.

Switching Mode Power Supply (SMPS)

AC-DC Adapters

Use Scenario: Output rectification in 5–24 V, 10–30 W offline flyback converters.

IC Role / Device Role / Timing Role: Freewheeling diode conducting during MOSFET off-time; defines output voltage ripple and efficiency floor.

Use Value: 0.50 V V_F minimizes conduction loss at 1 A load, improving full-load efficiency by ≥1.2% versus standard silicon rectifiers.

Use Scenario: Secondary-side rectification in universal-input wall adapters for consumer electronics.

IC Role / Device Role / Timing Role: Unidirectional current path converting transformer AC to regulated DC; subjected to repeated 60 Hz line-frequency surges.

Use Value: 30 A I_FSM withstands cold-start inrush without degradation, extending adapter field life beyond 50,000 cycles.

LED Lighting Drivers

DC-DC Buck Converters

Use Scenario: Constant-current output rectification in isolated LED drivers for commercial downlights.

IC Role / Device Role / Timing Role: Synchronous rectifier alternative in quasi-resonant topologies; handles 100 kHz–500 kHz switching.

Use Value: 125°C T_J max allows operation in thermally dense LED modules without forced air, reducing BOM cost.

Use Scenario: High-frequency synchronous rectification replacement in 3.3 V/5 V point-of-load converters.

IC Role / Device Role / Timing Role: Low-loss freewheeling path during high-side switch off-time; directly impacts light-load efficiency.

Use Value: 500 µA I_R at 25°C limits standby leakage, enabling compliance with Energy Star Level VI no-load power requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SS14 (Diodes Inc.)	Same 1 A / 40 V rating, but VF = 0.55 V (typ) at 1 A; R_θJL = 30°C/W; TJ max = 125°C	Slightly higher conduction loss; less thermal headroom in high-ambient designs	Preferred where footprint compatibility with SMB is required but tighter VF tolerance is not critical
SB140 (ON Semiconductor)	1 A / 40 V, VF = 0.52 V (max) at 1 A; I_R = 1 mA at 25°C; TJ max = 125°C; same DO-214AA package	Higher reverse leakage affects low-power standby performance; identical surge rating	Selected when legacy qualification data exists, though SK14B offers 50% lower IR at rated VR

Compared with SS14 and SB140, the SK14B provides the lowest forward voltage (0.50 V) and tightest reverse leakage (500 µA) within the 40 V SMB Schottky class, delivering superior efficiency in thermally constrained, high-volume adapter and lighting applications.

Availability

SK14B is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and LED lighting drivers requiring stable component supply across production lifecycles.

Supply support for SK14B 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 and signal conditioning markets since 1979.

The SK14B belongs to TSC's SK1xB Schottky rectifier family, engineered specifically for high-efficiency, surface-mount secondary-side rectification in cost-sensitive, high-volume power conversion systems.

FAQ

What is the maximum junction temperature rating for the SK14B?

The SK14B has a maximum junction temperature (T_J) rating of 125°C, verified per absolute maximum ratings table in the official datasheet. This limit applies under continuous forward conduction at rated current and must be respected in thermal design. Derating is required above this temperature, and operation beyond 125°C risks permanent parameter shift or catastrophic failure. The SK14B is not rated for 150°C operation-only SK1xB variants marked with "150" suffix (e.g., SK115B) support that higher rating.

Does the SK14B have a specified forward voltage at elevated temperature?

Yes, the SK14B datasheet specifies forward voltage (V_F) only at T_J = 25°C (0.50 V typ at 1 A). No typical or max V_F values are provided for 100°C or 125°C junction temperatures. Engineers must rely on curve Fig.4 (Typical Forward Characteristics) to estimate V_F increase with temperature, noting that Schottky V_F typically decreases ~1.8 mV/°C, so V_F at 125°C may be ~0.45 V under same test conditions.

Is the SK14B pin-compatible with other DO-214AA Schottky diodes like SS14 or SB140?

Yes, the SK14B uses the standard DO-214AA (SMB) package with anode and cathode terminals arranged identically to SS14 and SB140. Mechanical dimensions-including body length (4.60 mm), width (2.60 mm), and lead spacing (2.00 mm)-match JEDEC DO-214AA specifications. No PCB layout change is needed when substituting SK14B into existing SMB footprints used for those parts.

What is the reverse leakage current of the SK14B at 100°C junction temperature?

At T_J = 100°C and rated reverse voltage (40 V), the SK14B exhibits a maximum reverse leakage current (I_R) of 10 mA, as confirmed in the Electrical Specifications table. This value is significantly higher than its 500 µA rating at 25°C, reflecting the exponential temperature dependence of Schottky junction leakage. Designers must verify thermal management ensures I_R remains within system-level power budget at worst-case ambient + self-heating.

Does the SK14B meet automotive-grade reliability standards?

No, the SK14B is not qualified to AEC-Q101 or any automotive stress test standard. The datasheet explicitly states these devices "are not designed for use in medical, life-saving, or life-sustaining applications," and no automotive qualification data (e.g., HTOL, TC, UHAST) is published. It is intended for industrial, consumer, and commercial power applications only. For automotive use, engineers must select TSC's AEC-Q101-qualified equivalents or alternate vendors' qualified parts.

SK14B Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AA, SMB

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 40 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 500 mV @ 1 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 500 µA @ 40 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AA (SMB)

Operating Temperature - Junction:: -55°C ~ 125°C

SK14B FAQ

1.How can I place an order for SK14B through Aetrix?

Please submit a Request for Quotation (RFQ) for SK14B 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 SK14B reliable?

The price and inventory of SK14B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK14B is usually 5 days.

3.What payment methods are accepted for SK14B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK14B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SK14B?

SK14B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SK14B 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 SK14B?

For technical support, including SK14B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK14B requirements.

6.How does Aetrix verify that SK14B is sourced from the original manufacturer or authorized distributors?

All SK14B 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 SK14B meets industry standards.

7.What is the process for return or replacement of SK14B?

All SK14B units undergo pre-shipment inspection (PSI). If there is an issue with SK14B, 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 SK14B part is unused and in its original packaging.

Return procedure for SK14B:

1.Submit a request within 90 days.

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

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