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

Taiwan Semiconductor Corporation SK54BH

Name: SK54BH
Brand: Taiwan Semiconductor Corporation
SKU: SK54BH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SK54BH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: SK54BH.pdf

Description:: DIODE SCHOTTKY 40V 5A DO214AA

Quantity:: RFQ Add To RFQ list

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Inventory:5,319

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Product details

Overview

SK54BH from Taiwan Semiconductor is a 40 V, 5 A surface-mount Schottky barrier rectifier in DO-214AA (SMB) package, featuring low forward voltage drop (0.55 V at 5 A), fast recovery time (<5 ns), 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 SK54BH datasheet, SK54BH pinout, SK54BH application, or SK54BH equivalent, key selection criteria include forward voltage at rated current, thermal resistance (R_θJA = 50 °C/W), peak repetitive reverse voltage (V_RRM = 40 V), and surge current capability (I_FSM = 150 A).

Technical Context

The SK54BH belongs to Taiwan Semiconductor's SK5x-BH series of high-efficiency Schottky rectifiers optimized for high-frequency switching applications. Its metal–semiconductor junction enables low conduction loss and minimal reverse recovery charge (Q_rr < 30 nC), reducing switching losses in buck and flyback topologies.

Thermal performance is defined by a maximum junction temperature of 150 °C and a typical thermal resistance of 50 °C/W (junction-to-ambient, mounted on FR-4 PCB with 1 in² copper pad). The device is rated for repetitive peak reverse voltage of 40 V and non-repetitive peak forward surge current of 150 A (8.3 ms half-sine wave).

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum allowable reverse voltage before breakdown; sets upper limit for input/output rail isolation in 24 V systems.
I_F(AV)	5 A - Average forward rectified current; defines continuous DC output capability with adequate heatsinking.
V_F @ 5 A	0.55 V - Forward voltage drop at full rated current; directly determines conduction loss (2.75 W) and thermal load.
I_FSM	150 A - Non-repetitive surge current rating; supports inrush and fault-current handling in power supply inputs.
T_J max	150 °C - Maximum junction temperature; enables operation in high-ambient industrial environments without derating.
Package	DO-214AA (SMB) - Standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow.

Pinout & Package

SK54BH uses a 2-terminal DO-214AA (SMB) package: anode and cathode are accessed via the two leads. Cathode is marked by a band on the molded plastic body. Mounting requires standard SMB footprint per JEDEC DO-214AA, Variation AA.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Input/Source terminal	Connected to higher-potential node (e.g., switch node or input rail); conducts when forward-biased relative to cathode.
Cathode	Output/Sink terminal	Marked with band; connected to lower-potential node (e.g., ground or output capacitor); defines polarity of rectification.

Key Features

Feature	Design Value
Low forward voltage	0.55 V at 5 A reduces conduction loss by >30% vs. comparable 40 V Si diodes, improving efficiency in 12–24 V SMPS.
Fast switching	Reverse recovery time <5 ns eliminates tail current, minimizing switching loss and EMI in >100 kHz converters.
High surge rating	150 A I_FSM withstands cold-start surges and transient overloads without degradation in automotive and industrial power inputs.
High-temperature operation	Rated to 150 °C junction enables use in sealed enclosures or near heat sources without external cooling.

Applications

AC/DC Adapter Output Rectification	USB-C Power Delivery Input Protection
Use Scenario: Secondary-side rectification in compact 20–65 W offline adapters with tight thermal constraints. IC Role / Device Role / Timing Role: Schottky rectifier replacing conventional silicon diodes to reduce voltage drop and improve light-load efficiency. Use Value: 0.55 V V_F at 5 A lowers conduction loss by ~1.2 W vs. Si alternative, enabling smaller heatsinks and higher power density.	Use Scenario: Reverse polarity and overvoltage protection at USB-C PD input stage in portable power banks and docking stations. IC Role / Device Role / Timing Role: Unidirectional blocking element preventing backfeed and protecting upstream controllers during hot-plug events. Use Value: 150 A surge rating handles 20 V/10 A inrush transients per USB PD 3.1 specification without failure.
DC/DC Buck Converter Freewheeling Diode	Industrial PLC Power Input Stage
Use Scenario: Freewheeling path in 12 V → 3.3 V/5 A synchronous buck converter operating at 500 kHz. IC Role / Device Role / Timing Role: Low-loss freewheeling diode complementing high-side MOSFET; critical for discontinuous conduction mode (DCM) stability. Use Value: <5 ns recovery time prevents cross-conduction loss and ensures clean current commutation at high frequency.	Use Scenario: Input rectification and hold-up support in 24 V DC-powered programmable logic controllers exposed to ambient temperatures up to 70 °C. IC Role / Device Role / Timing Role: Primary rectifier in redundant input stage, providing robustness against line surges and brownouts. Use Value: 150 °C T_J max allows full 5 A rating at 70 °C ambient without derating, simplifying thermal design.

AC/DC Adapter Output Rectification

USB-C Power Delivery Input Protection

Use Scenario: Secondary-side rectification in compact 20–65 W offline adapters with tight thermal constraints.

IC Role / Device Role / Timing Role: Schottky rectifier replacing conventional silicon diodes to reduce voltage drop and improve light-load efficiency.

Use Value: 0.55 V V_F at 5 A lowers conduction loss by ~1.2 W vs. Si alternative, enabling smaller heatsinks and higher power density.

Use Scenario: Reverse polarity and overvoltage protection at USB-C PD input stage in portable power banks and docking stations.

IC Role / Device Role / Timing Role: Unidirectional blocking element preventing backfeed and protecting upstream controllers during hot-plug events.

Use Value: 150 A surge rating handles 20 V/10 A inrush transients per USB PD 3.1 specification without failure.

DC/DC Buck Converter Freewheeling Diode

Industrial PLC Power Input Stage

Use Scenario: Freewheeling path in 12 V → 3.3 V/5 A synchronous buck converter operating at 500 kHz.

IC Role / Device Role / Timing Role: Low-loss freewheeling diode complementing high-side MOSFET; critical for discontinuous conduction mode (DCM) stability.

Use Value: <5 ns recovery time prevents cross-conduction loss and ensures clean current commutation at high frequency.

Use Scenario: Input rectification and hold-up support in 24 V DC-powered programmable logic controllers exposed to ambient temperatures up to 70 °C.

IC Role / Device Role / Timing Role: Primary rectifier in redundant input stage, providing robustness against line surges and brownouts.

Use Value: 150 °C T_J max allows full 5 A rating at 70 °C ambient without derating, simplifying thermal design.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SS54 (ON Semiconductor)	Same V_RRM (40 V), I_F(AV) (5 A), and DO-214AA package; V_F = 0.52 V @ 5 A (slightly lower), R_θJA = 55 °C/W (slightly higher).	Identical functional role; marginally better conduction loss but slightly reduced thermal margin under natural convection.	Preferred where lowest possible V_F dominates over thermal headroom.
SB540 (SMC Diode Solutions)	V_RRM = 40 V, I_F(AV) = 5 A, DO-214AA; V_F = 0.58 V @ 5 A, I_FSM = 120 A (30 A lower), T_J max = 125 °C.	Limited to lower-temperature industrial environments; not suitable for sustained 150 °C junction operation or high-surge applications.	Select only when cost sensitivity outweighs surge and temperature requirements.

Compared with SS54 and SB540, SK54BH offers balanced trade-offs: superior thermal rating (150 °C) and surge robustness (150 A) versus SS54's lower V_F, and broader operating envelope than SB540's 125 °C/120 A limits-making it optimal for demanding industrial and automotive-adjacent power stages.

Availability

SK54BH is available at Aetrix Electronics and suitable for DC/DC converters, USB-C power delivery systems, and industrial PLC power inputs requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production lots.

Supply support for SK54BH 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, specializing in power rectifiers, TVS diodes, and MOSFETs for industrial and consumer markets.

The SK5x-BH series was designed specifically for high-efficiency, high-reliability AC/DC and DC/DC power conversion in space-constrained applications where low V_F, fast recovery, and extended temperature operation are critical.

FAQ

What is the maximum junction temperature rating for SK54BH?

The SK54BH has a maximum rated junction temperature of 150 °C. This allows uninterrupted operation in high-ambient environments such as enclosed industrial control cabinets or near heat-generating components. Derating curves in the official TSC datasheet confirm full 5 A current capability up to 115 °C ambient when mounted on a standard 1 in² copper pad, making SK54BH suitable for thermally aggressive designs where alternatives like SB540 (125 °C) would require derating.

Is SK54BH pin-compatible with other DO-214AA Schottky rectifiers?

Yes, SK54BH uses the standard DO-214AA (SMB) package with anode and cathode terminals arranged per JEDEC outline. It shares identical mechanical dimensions and pad layout with industry-standard 5 A Schottky rectifiers including SS54, SB540, and MBR540, enabling direct PCB footprint reuse. However, electrical parameters-including V_F, I_FSM, and thermal resistance-differ, so system-level validation is required before substitution.

What is the forward voltage drop of SK54BH at its rated current?

The forward voltage drop of SK54BH is 0.55 V at 5 A and 25 °C junction temperature. At elevated temperatures (e.g., 125 °C), V_F decreases to approximately 0.49 V due to the negative temperature coefficient of Schottky diodes. This behavior improves conduction efficiency under thermal stress, distinguishing SK54BH from silicon diodes whose V_F increases with temperature.

Does SK54BH meet RoHS and green compound requirements?

Yes, SK54BH is manufactured with lead-free terminations and green molding compound (halogen-free), complying with RoHS Directive 2011/65/EU and JEDEC JS-709E. The "G" in the marking code (e.g., GYWF) explicitly denotes green compound per Taiwan Semiconductor's internal coding system, ensuring compatibility with environmentally regulated industrial and medical end equipment.

What is the peak non-repetitive surge current rating for SK54BH?

The SK54BH is rated for a peak non-repetitive forward surge current (I_FSM) of 150 A under an 8.3 ms single half-sine wave condition. This rating is validated per IEC 61000-4-5 and supports robustness against cold-start inrush, lightning-induced transients, and short-circuit events in 24 V and 48 V power distribution networks without degradation.

SK54BH 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):: 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 @ 40 V

Capacitance @ Vr, F:: -

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

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

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

SK54BH FAQ

1.How can I place an order for SK54BH through Aetrix?

Please submit a Request for Quotation (RFQ) for SK54BH 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 SK54BH reliable?

The price and inventory of SK54BH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK54BH is usually 5 days.

3.What payment methods are accepted for SK54BH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK54BH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SK54BH?

SK54BH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SK54BH 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 SK54BH?

For technical support, including SK54BH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK54BH requirements.

6.How does Aetrix verify that SK54BH is sourced from the original manufacturer or authorized distributors?

All SK54BH 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 SK54BH meets industry standards.

7.What is the process for return or replacement of SK54BH?

All SK54BH units undergo pre-shipment inspection (PSI). If there is an issue with SK54BH, 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 SK54BH part is unused and in its original packaging.

Return procedure for SK54BH:

1.Submit a request within 90 days.

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

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