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

Taiwan Semiconductor Corporation SK53BH

Name: SK53BH
Brand: Taiwan Semiconductor Corporation
SKU: SK53BH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SK53BH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: SK53BH.pdf

Description:: DIODE SCHOTTKY 30V 5A DO214AA

Quantity:: RFQ Add To RFQ list

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Inventory:7,319

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Product details

Overview

SK53BH 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 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 SK53BH datasheet, SK53BH pinout, SK53BH application, or SK53BH equivalent, key selection criteria include forward voltage at rated current, thermal resistance (R_θJA = 50 °C/W), peak repetitive reverse voltage (V_RRM = 30 V), and surge current capability (I_FSM = 150 A).

Technical Context

The SK53BH belongs to Taiwan Semiconductor's SK5x-BH series of high-efficiency Schottky rectifiers optimized for high-frequency switching applications. Its planar construction and low-junction-capacitance design minimize switching losses in buck converters and OR-ing circuits.

Thermal performance is defined by its SMB package with copper leadframe and molded plastic body per JEDEC DO-214AA. The device supports continuous operation at T_J = 150 °C and withstands 8.3 ms half-sine surge currents up to 150 A.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	30 V - Maximum repetitive reverse voltage; sets upper limit for blocking capability in 24 V system inputs.
I_F(AV)	5 A - Average forward rectified current; defines continuous DC output capability with adequate heatsinking.
V_F @ 5 A	0.52 V - Low conduction loss at full load; reduces power dissipation and improves efficiency in 12–24 V DC/DC stages.
I_FSM	150 A - Non-repetitive peak surge current; enables robustness against inrush and fault transients in industrial power rails.
T_J max	150 °C - Maximum junction temperature; allows operation in sealed enclosures or high-ambient environments without derating.
R_θJA	50 °C/W - Junction-to-ambient thermal resistance; determines required PCB copper area (≥ 1 cm² 2 oz Cu) for thermal management.

Pinout & Package

SK53BH uses the DO-214AA (SMB) surface-mount package: 4.6 mm × 3.95 mm × 2.2 mm body, cathode-indicated by band, molded green compound, JEDEC-compliant outline with copper leadframe for low thermal resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Input current entry point	Connected to source-side of rectification path (e.g., switch node or input rail); must handle full load current and transient spikes.
Cathode	Output current exit point	Connected to output capacitor or load; polarity-sensitive-reverse connection causes short-circuit failure.

Key Features

Feature	Design Value
Low forward voltage	0.52 V @ 5 A - Reduces conduction loss by >30% vs. standard PN diodes, critical for high-efficiency 24 V → 5/3.3 V conversion.
Fast switching	<5 ns reverse recovery time - Eliminates minority-carrier tail current, enabling >500 kHz operation without snubbers.
High surge rating	150 A I_FSM - Withstands repeated cold-start surges in automotive and industrial 24 V systems without degradation.
High-temperature operation	150 °C T_J max - Supports under-hood or enclosed power module designs without forced air cooling.

Applications

DC/DC Converter Output Rectification	Reverse Polarity Protection
Use Scenario: Secondary-side rectification in synchronous or non-synchronous buck converters delivering 3.3 V/5 V/12 V from 24 V input. IC Role / Device Role / Timing Role: Unidirectional current valve converting switched AC-like waveform to regulated DC output. Use Value: 0.52 V V_F minimizes power loss at 5 A load, improving converter efficiency by ~2.1% over comparable 0.7 V diodes.	Use Scenario: Input protection for 24 V industrial controllers exposed to field wiring errors. IC Role / Device Role / Timing Role: Series-blocking element that conducts only when polarity is correct; fails open on reverse bias. Use Value: 150 A I_FSM survives accidental -24 V connection during hot-plug, preventing downstream IC damage.
OR-ing Diode in Dual-Supply Systems	Freewheeling Diode in Motor Drivers
Use Scenario: Redundant 24 V power inputs in telecom shelf controllers requiring seamless switchover. IC Role / Device Role / Timing Role: Active OR-ing element enabling automatic selection of higher-voltage supply while blocking backfeed. Use Value: Low V_F ensures minimal voltage drop between supplies, reducing cross-conduction risk and thermal imbalance.	Use Scenario: Inductive kickback clamping in 24 V brushed DC motor H-bridge drivers. IC Role / Device Role / Timing Role: Freewheeling path for stored inductor energy during PWM off-time. Use Value: <5 ns recovery prevents voltage overshoot spikes >60 V, protecting MOSFETs without RC snubbers.

DC/DC Converter Output Rectification

Reverse Polarity Protection

Use Scenario: Secondary-side rectification in synchronous or non-synchronous buck converters delivering 3.3 V/5 V/12 V from 24 V input.

IC Role / Device Role / Timing Role: Unidirectional current valve converting switched AC-like waveform to regulated DC output.

Use Value: 0.52 V V_F minimizes power loss at 5 A load, improving converter efficiency by ~2.1% over comparable 0.7 V diodes.

Use Scenario: Input protection for 24 V industrial controllers exposed to field wiring errors.

IC Role / Device Role / Timing Role: Series-blocking element that conducts only when polarity is correct; fails open on reverse bias.

Use Value: 150 A I_FSM survives accidental -24 V connection during hot-plug, preventing downstream IC damage.

OR-ing Diode in Dual-Supply Systems

Freewheeling Diode in Motor Drivers

Use Scenario: Redundant 24 V power inputs in telecom shelf controllers requiring seamless switchover.

IC Role / Device Role / Timing Role: Active OR-ing element enabling automatic selection of higher-voltage supply while blocking backfeed.

Use Value: Low V_F ensures minimal voltage drop between supplies, reducing cross-conduction risk and thermal imbalance.

Use Scenario: Inductive kickback clamping in 24 V brushed DC motor H-bridge drivers.

IC Role / Device Role / Timing Role: Freewheeling path for stored inductor energy during PWM off-time.

Use Value: <5 ns recovery prevents voltage overshoot spikes >60 V, protecting MOSFETs without RC snubbers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SS53HE3/52T	V_RRM = 30 V, I_F(AV) = 5 A, V_F = 0.55 V @ 5 A, R_θJA = 55 °C/W, DO-214AA package	Slightly higher V_F and thermal resistance; lower surge rating (120 A)	Acceptable where ambient temperature ≤ 85 °C and surge margin is not critical.
SB530-E3/52	V_RRM = 30 V, I_F(AV) = 5 A, V_F = 0.54 V @ 5 A, R_θJA = 52 °C/W, DO-214AA package	Comparable V_F, marginally better thermal resistance, same surge rating (150 A)	Drop-in alternative with identical footprint and nearly identical electrical behavior.

Compared with SK53BH, SS53HE3/52T offers slightly lower cost but requires larger PCB copper area for thermal management, while SB530-E3/52 delivers near-identical performance with broader global distribution and longer production continuity.

Availability

SK53BH is available at Aetrix Electronics and suitable for DC/DC converters, reverse polarity protection circuits, OR-ing diode networks, and freewheeling applications requiring stable component supply across industrial, automotive, and telecom power designs.

Supply support for SK53BH 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 devices, and MOSFETs since 1979.

The SK5x-BH series was designed specifically for high-efficiency, high-reliability 24 V system rectification in space-constrained industrial and transportation applications, emphasizing low V_F, high T_J, and robust surge handling.

FAQ

What is the maximum junction temperature rating for SK53BH?

The SK53BH has a maximum rated junction temperature of 150 °C, verified per its thermal characterization curves and steady-state derating tables. This allows uninterrupted operation in sealed enclosures or high-ambient environments where board-level temperatures reach 105 °C, provided PCB thermal design meets R_θJA = 50 °C/W requirements. The SK53BH maintains specified V_F and leakage performance up to this limit.

Is SK53BH pin-compatible with other DO-214AA Schottky rectifiers?

Yes, SK53BH uses the standard DO-214AA (SMB) package with anode and cathode terminals arranged per JEDEC outline. It shares identical mechanical dimensions and solder pad layout with industry-standard 5 A/30 V Schottkys like SB530 and SS53HE3/52T, enabling direct PCB footprint reuse. The SK53BH cathode band orientation matches the JEDEC specification, ensuring consistent assembly polarity.

What is the forward voltage drop of SK53BH at 3 A and 25 °C?

Per the SK53BH datasheet's 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 confirmed by the family's normalized V_F trend across SK52BH–SK515BH variants and aligns with the 0.52 V spec at 5 A. Designers can use this for accurate loss calculation in mid-load conditions.

Does SK53BH meet RoHS and REACH compliance?

Yes, SK53BH is manufactured using lead-free (Pb-free) materials and complies with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. The green compound molding material and matte tin-plated leads are fully compliant, and Taiwan Semiconductor provides material declarations upon request. The SK53BH marking includes "G" to indicate green compound per its marking diagram.

What is the peak repetitive reverse voltage (V_RRM) of SK53BH?

The SK53BH is rated for a peak repetitive reverse voltage (V_RRM) of 30 V, as specified in Taiwan Semiconductor's official SK5x-BH datasheet revision B2309. This rating applies under continuous operation with proper thermal management and defines the maximum reverse-bias voltage the device can block without breakdown. It is suitable for 24 V nominal systems with typical transients up to ±30 %.

SK53BH 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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

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

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

SK53BH FAQ

1.How can I place an order for SK53BH through Aetrix?

Please submit a Request for Quotation (RFQ) for SK53BH 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 SK53BH reliable?

The price and inventory of SK53BH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK53BH is usually 5 days.

3.What payment methods are accepted for SK53BH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK53BH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SK53BH?

SK53BH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SK53BH 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 SK53BH?

For technical support, including SK53BH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK53BH requirements.

6.How does Aetrix verify that SK53BH is sourced from the original manufacturer or authorized distributors?

All SK53BH 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 SK53BH meets industry standards.

7.What is the process for return or replacement of SK53BH?

All SK53BH units undergo pre-shipment inspection (PSI). If there is an issue with SK53BH, 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 SK53BH part is unused and in its original packaging.

Return procedure for SK53BH:

1.Submit a request within 90 days.

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

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