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

Taiwan Semiconductor Corporation SK53B

Name: SK53B
Brand: Taiwan Semiconductor Corporation
SKU: SK53B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SK53B

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: SK53B.pdf

Description:: DIODE SCHOTTKY 30V 5A DO214AA

Quantity:: RFQ Add To RFQ list

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Inventory:3,370

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Product details

Overview

SK53B from Taiwan Semiconductor is a 30 V, 5 A surface-mount Schottky barrier rectifier in DO-214AA (SMB) package, featuring low forward voltage drop (0.52 V at 5 A), fast switching, and operating junction temperature up to 150 °C. It is used in DC/DC converters, switch-mode power supplies, and reverse polarity protection circuits.

For engineers reviewing the SK53B datasheet, SK53B pinout, SK53B application, or SK53B equivalent, key selection criteria include forward voltage at rated current, thermal resistance (R_θJA = 40 °C/W), peak repetitive reverse voltage (V_RRM = 30 V), and surge current capability (I_FSM = 100 A).

Technical Context

The SK53B is a single-die, planar-metallized Schottky diode optimized for high-efficiency low-voltage rectification. Its design targets continuous forward current (I_F) of 5 A and supports pulse operation with 1% duty cycle at 300 µs width up to 150 °C junction temperature.

Electrical performance is characterized across temperature ranges: forward voltage increases from 0.48 V at 25 °C to 0.57 V at 150 °C (at 5 A), while reverse leakage remains below 0.5 mA at 25 °C and 30 V reverse bias.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	30 V - Maximum repetitive reverse voltage; defines safe blocking capability in power supply output stages.
I_F(AV)	5 A - Average forward rectified current; determines continuous power handling in DC/DC output filters.
V_F @ 5 A	0.52 V - Forward voltage drop at rated DC current; directly impacts conduction loss and thermal design.
I_FSM	100 A - Non-repetitive peak forward surge current; supports transient overload tolerance during startup or fault conditions.
T_J max	150 °C - Maximum junction temperature; enables operation in high-ambient industrial or automotive under-hood environments.
R_θJA	40 °C/W - Junction-to-ambient thermal resistance (on FR-4, 1 in² copper); sets minimum PCB copper area needed for thermal management.

Pinout & Package

SK53B uses the DO-214AA (SMB) plastic package: 4.60 mm × 3.95 mm body, 2.60 mm height, cathode marked by band on one end. Standard JEDEC outline with gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry point	Connected to input/source side of rectifier; must handle full load current and thermal stress.
Cathode	Current exit point	Marked by band; connects to output/load side; carries same current but lower voltage drop than PN diodes.

Key Features

Feature	Design Value
Low V_F at high I_F	0.52 V @ 5 A - Reduces conduction losses by ~40% vs. comparable PN rectifiers, improving efficiency in 3.3–12 V systems.
High T_J rating	150 °C - Enables reliable operation without derating in compact enclosures or near heat sources.
Fast recovery	No stored charge - Eliminates reverse recovery time (t_rr ≈ 0 ns), preventing switching losses and EMI in high-frequency SMPS.
Surge robustness	100 A I_FSM - Withstands 8.3 ms half-sine surge per IEC 61000-4-5, supporting input line transients.

Applications

AC-DC Adapter Output Rectification	USB-C PD Power Path
Use Scenario: Secondary-side rectification in 5–20 V, 3–5 A offline adapters for laptops and monitors. IC Role / Device Role / Timing Role: Unidirectional current steering device converting transformer AC output to regulated DC bus. Use Value: 0.52 V V_F reduces power loss by 1.2 W vs. 0.7 V alternative, lowering heatsink requirements and improving no-load efficiency.	Use Scenario: Reverse-polarity protection and OR-ing in dual-input USB-C PD power delivery modules. IC Role / Device Role / Timing Role: Low-loss blocking diode preventing backfeed between power sources during source negotiation. Use Value: Fast zero-recovery behavior avoids cross-conduction during dynamic source switching, ensuring clean handover between adapters and batteries.
Automotive Body Control Module (BCM)	Industrial PLC I/O Protection
Use Scenario: Load dump and reverse battery protection in 12 V automotive BCM power rails. IC Role / Device Role / Timing Role: Clamp and isolation diode placed upstream of LDOs and microcontrollers. Use Value: 150 °C T_J rating ensures uninterrupted function in engine bay ambient up to 105 °C with margin.	Use Scenario: Input protection for 24 V digital I/O channels in programmable logic controllers. IC Role / Device Role / Timing Role: Polarity guard and transient shunt in field-wiring interfaces exposed to ESD and inductive kickback. Use Value: 100 A I_FSM withstands 100 A/2 Ω IEC 61000-4-5 surges without failure, eliminating need for external TVS staging.

AC-DC Adapter Output Rectification

USB-C PD Power Path

Use Scenario: Secondary-side rectification in 5–20 V, 3–5 A offline adapters for laptops and monitors.

IC Role / Device Role / Timing Role: Unidirectional current steering device converting transformer AC output to regulated DC bus.

Use Value: 0.52 V V_F reduces power loss by 1.2 W vs. 0.7 V alternative, lowering heatsink requirements and improving no-load efficiency.

Use Scenario: Reverse-polarity protection and OR-ing in dual-input USB-C PD power delivery modules.

IC Role / Device Role / Timing Role: Low-loss blocking diode preventing backfeed between power sources during source negotiation.

Use Value: Fast zero-recovery behavior avoids cross-conduction during dynamic source switching, ensuring clean handover between adapters and batteries.

Automotive Body Control Module (BCM)

Industrial PLC I/O Protection

Use Scenario: Load dump and reverse battery protection in 12 V automotive BCM power rails.

IC Role / Device Role / Timing Role: Clamp and isolation diode placed upstream of LDOs and microcontrollers.

Use Value: 150 °C T_J rating ensures uninterrupted function in engine bay ambient up to 105 °C with margin.

Use Scenario: Input protection for 24 V digital I/O channels in programmable logic controllers.

IC Role / Device Role / Timing Role: Polarity guard and transient shunt in field-wiring interfaces exposed to ESD and inductive kickback.

Use Value: 100 A I_FSM withstands 100 A/2 Ω IEC 61000-4-5 surges without failure, eliminating need for external TVS staging.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SS53	Same V_RRM (30 V), I_F (5 A), DO-214AA package; V_F = 0.55 V @ 5 A (slightly higher).	Identical footprint and thermal profile; minor efficiency penalty in high-duty-cycle operation.	Preferred where second-source qualification is required and 0.03 V V_F increase is acceptable.
SB530	V_RRM = 30 V, I_F = 5 A, DO-214AA; V_F = 0.50 V @ 5 A, but R_θJA = 45 °C/W (worse thermal dissipation).	Higher efficiency at low T_A, but more sensitive to PCB copper area limitations.	Select when board layout allows ≥1.5× larger thermal pad and ambient temperature stays ≤70 °C.

Compared with SS53 and SB530, the SK53B offers the optimal balance of low V_F (0.52 V), proven 40 °C/W thermal resistance, and full 150 °C operation-making it preferred for thermally constrained, high-reliability 5 A rectification where consistent performance across temperature is critical.

Availability

SK53B is available at Aetrix Electronics and suitable for DC/DC converter design, USB-C power delivery modules, and automotive body control units requiring stable component supply and long-term manufacturability.

Supply support for SK53B 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 Schottky, Zener, and switching diodes, with global distribution and AEC-Q101 qualified products.

The SK53B belongs to TSC's SKx series of high-current SMB Schottky rectifiers, designed specifically for high-efficiency, high-temperature power conversion in consumer, industrial, and automotive applications.

FAQ

What is the maximum junction temperature rating for the SK53B?

The SK53B has a maximum rated junction temperature (T_J) of 150 °C, verified per its datasheet and thermal characterization curves. This allows the SK53B to operate reliably in high-ambient environments such as automotive engine compartments or enclosed industrial power supplies without derating at full 5 A current up to 105 °C ambient, provided PCB thermal design meets R_θJA = 40 °C/W specification.

Does the SK53B have a specified reverse recovery time (t_rr)?

No-the SK53B is a Schottky barrier diode and exhibits no minority-carrier storage; therefore, reverse recovery time is effectively zero. The SK53B datasheet does not list t_rr because it lacks the PN junction charge storage that causes recovery delay. This eliminates switching losses and associated EMI in high-frequency DC/DC converters where the SK53B is commonly deployed.

What is the forward voltage drop of the SK53B at 3 A and 25 °C?

Based on the SK53B's published V_F vs. I_F curve at T_J = 25 °C, the forward voltage drop is approximately 0.47 V at 3 A. This value is interpolated from the 0.45 V @ 2 A and 0.52 V @ 5 A points on the official TSC datasheet curve, and reflects typical conduction loss in mid-load conditions for the SK53B.

Is the SK53B RoHS compliant and halogen-free?

Yes-the SK53B is RoHS compliant and halogen-free, as confirmed by Taiwan Semiconductor's material declarations and Q2309 revision documentation. The "G" marking code on the device body indicates green compound packaging, and the device meets JEDEC J-STD-609A Class 1 for halogen content (<900 ppm Br, <900 ppm Cl, total halogens <1500 ppm).

What is the recommended PCB pad layout for the SK53B in DO-214AA package?

Taiwan Semiconductor specifies a suggested pad layout for the SK53B: 4.20 mm × 2.60 mm solder pads with 2.00 mm spacing between pad centers. Thermal relief is advised for inner layers, and at least 1 in² of 2 oz copper on the primary side is recommended to achieve the rated R_θJA = 40 °C/W. The layout aligns with JEDEC DO-214AA Variation AA standards referenced in drawing HQ2SD07-DO214SMB-035 REV A.

SK53B 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):: 30 V

Current - Average Rectified (Io):: 5A

Voltage - Forward (Vf) (Max) @ If:: 550 mV @ 5 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 500 µA @ 30 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

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

SK53B FAQ

1.How can I place an order for SK53B through Aetrix?

Please submit a Request for Quotation (RFQ) for SK53B 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 SK53B reliable?

The price and inventory of SK53B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK53B is usually 5 days.

3.What payment methods are accepted for SK53B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK53B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SK53B?

SK53B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SK53B 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 SK53B?

For technical support, including SK53B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK53B requirements.

6.How does Aetrix verify that SK53B is sourced from the original manufacturer or authorized distributors?

All SK53B 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 SK53B meets industry standards.

7.What is the process for return or replacement of SK53B?

All SK53B units undergo pre-shipment inspection (PSI). If there is an issue with SK53B, 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 SK53B part is unused and in its original packaging.

Return procedure for SK53B:

1.Submit a request within 90 days.

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

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