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

Taiwan Semiconductor Corporation SK12H45

Name: SK12H45
Brand: Taiwan Semiconductor Corporation
SKU: SK12H45
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SK12H45

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SK12H45.pdf

Description:: DIODE SCHOTTKY 45V 12A DO201AD

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Inventory:9,982

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Product details

Overview

SK12H45 from Taiwan Semiconductor is a 12A, 45V AEC-Q101-qualified Schottky barrier rectifier in DO-201AD package, featuring 0.55V max forward voltage at 12A/25°C, 320A surge capability, and 175°C max junction temperature - deployed in automotive-grade DC-DC converters and industrial SMPS.

For engineers reviewing the SK12H45 datasheet, SK12H45 pinout, SK12H45 application, or SK12H45 equivalent, key selection criteria include its 45V repetitive peak reverse voltage, low VF for thermal efficiency, DO-201AD mechanical compatibility, AEC-Q101 qualification status, and 30°C/W junction-to-ambient thermal resistance.

Technical Context

The SK12H45 uses a single-die Schottky junction structure with guard ring overvoltage protection, optimized for high-frequency switching applications where low conduction loss and fast recovery are critical. Its pure tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.

Thermally, it delivers R_θJA = 30°C/W and R_θJC = 10°C/W, enabling stable 12A DC operation up to 175°C junction temperature when mounted on standard PCB copper areas. Reverse leakage remains ≤150 µA at 25°C and ≤20 mA at 100°C under rated V_RRM.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	45 V - maximum repetitive reverse blocking voltage; defines safe operating range in flyback/freewheeling paths
I_F	12 A - continuous forward current rating at T_A = 25°C; determines minimum heatsinking for sustained load
I_FSM	320 A - non-repetitive surge current (8.3ms half-sine); supports inrush and fault-current handling in power supplies
V_F (max)	0.55 V @ 12A, 25°C - low conduction loss directly reduces power dissipation and improves system efficiency
T_J (max)	175 °C - maximum junction temperature; enables operation in under-hood automotive environments
R_θJA	30 °C/W - thermal resistance from junction to ambient; used to calculate required PCB copper area for thermal management
Package	DO-201AD - industry-standard axial leaded package with UL 94V-0 molding compound and cathode band polarity marking

Pinout & Package

DO-201AD package: axial-leaded, molded plastic case with cathode band indicating terminal polarity; 1.30g mass; RoHS and halogen-free compliant; pure tin-plated leads.

Pin/Terminal	Circuit Role	Design Meaning
Anode (lead without band)	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter); must handle full 12A DC and 320A surge
Cathode (lead with band)	Forward current exit / reverse blocking terminal	Connected to output rail; blocks 45V reverse voltage; low IR ensures minimal leakage in standby mode

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive power electronics including engine control units and ADAS power rails
Guard ring structure	Enhances ruggedness against transient overvoltage events without derating V_RRM
Low V_F (0.55V max)	Reduces conduction loss by >30% vs. comparable 45V silicon diodes, lowering thermal stress in compact layouts
Junction-to-case R_θJC = 10°C/W	Enables direct thermal coupling to heatsinks or copper planes for high-power density designs
J-STD-002 solderable leads	Guarantees reliable reflow and wave solder joint formation without post-process cleaning

Applications

Automotive DC-DC Converters	Industrial SMPS
Use Scenario: Step-down conversion in 12V/48V dual-battery systems for infotainment and body control modules. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous or asynchronous buck topologies, conducting during low-side switch off-time. Use Value: AEC-Q101 qualification and 175°C T_J ensure reliability across temperature cycling; low V_F minimizes heat generation in sealed enclosures.	Use Scenario: Output rectification in open-frame 300W server PSUs operating at 100–240V AC input. IC Role / Device Role / Timing Role: Primary output rectifier handling continuous 12A load with high-efficiency demands. Use Value: 320A I_FSM withstands startup surges; DO-201AD mechanical robustness supports automated assembly and long-term vibration resistance.
Laptop Adapters	Telecom Power Modules
Use Scenario: Secondary-side rectification in compact 65W GaN-based USB-C PD adapters. IC Role / Device Role / Timing Role: High-frequency synchronous rectifier replacement in quasi-resonant flyback designs. Use Value: Low V_F and fast recovery reduce switching losses; RoHS/halogen-free compliance meets global regulatory requirements.	Use Scenario: -48V intermediate bus rectification in distributed telecom power systems with strict efficiency targets. IC Role / Device Role / Timing Role: Main output diode in isolated forward or half-bridge converters delivering 12–24V outputs. Use Value: Guard ring protection maintains reliability under lightning-induced transients; 30°C/W R_θJA simplifies thermal design in dense board layouts.

Automotive DC-DC Converters

Industrial SMPS

Use Scenario: Step-down conversion in 12V/48V dual-battery systems for infotainment and body control modules.

IC Role / Device Role / Timing Role: Freewheeling diode in synchronous or asynchronous buck topologies, conducting during low-side switch off-time.

Use Value: AEC-Q101 qualification and 175°C T_J ensure reliability across temperature cycling; low V_F minimizes heat generation in sealed enclosures.

Use Scenario: Output rectification in open-frame 300W server PSUs operating at 100–240V AC input.

IC Role / Device Role / Timing Role: Primary output rectifier handling continuous 12A load with high-efficiency demands.

Use Value: 320A I_FSM withstands startup surges; DO-201AD mechanical robustness supports automated assembly and long-term vibration resistance.

Laptop Adapters

Telecom Power Modules

Use Scenario: Secondary-side rectification in compact 65W GaN-based USB-C PD adapters.

IC Role / Device Role / Timing Role: High-frequency synchronous rectifier replacement in quasi-resonant flyback designs.

Use Value: Low V_F and fast recovery reduce switching losses; RoHS/halogen-free compliance meets global regulatory requirements.

Use Scenario: -48V intermediate bus rectification in distributed telecom power systems with strict efficiency targets.

IC Role / Device Role / Timing Role: Main output diode in isolated forward or half-bridge converters delivering 12–24V outputs.

Use Value: Guard ring protection maintains reliability under lightning-induced transients; 30°C/W R_θJA simplifies thermal design in dense board layouts.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-12EWH04-M3	45V V_RRM, 12A I_F, but TO-220AC package; higher R_θJA (40°C/W) and no AEC-Q101 qualification	Requires heatsink mounting; not suitable for automotive under-hood use	Select when board space allows TO-220 footprint and automotive qualification is unnecessary
ON Semiconductor SB1240-E3/54	40V V_RRM, same DO-201AD package and 12A rating; 0.57V V_F max; AEC-Q101 qualified	Lower voltage rating limits use in 45V+ systems; identical thermal and mechanical behavior	Choose only if system reverse voltage stays ≤40V and AEC-Q101 compliance is mandatory

Compared with VS-12EWH04-M3 and SB1240-E3/54, the SK12H45 uniquely combines 45V rating, AEC-Q101 qualification, and DO-201AD packaging - making it the only option meeting automotive-grade 45V rectification needs without heatsink dependency or voltage compromise.

Availability

SK12H45 is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial SMPS, and laptop adapters requiring stable component supply, long-lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for SK12H45 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 automotive, industrial, and consumer markets since 1979.

The SK12H45 belongs to TSC's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for high-reliability power conversion in harsh-environment applications where efficiency, surge resilience, and thermal stability are critical.

FAQ

What is the maximum junction temperature rating for the SK12H45?

The SK12H45 has a maximum junction temperature (T_J) rating of 175°C, verified per absolute maximum ratings table in the official TSC datasheet F2105. This allows the SK12H45 to operate reliably in under-hood automotive environments and high-temperature industrial enclosures without derating at full 12A current when thermal design meets R_θJA = 30°C/W.

Is the SK12H45 pin-compatible with other DO-201AD Schottky rectifiers?

Yes - the SK12H45 uses the standard DO-201AD axial package with anode and cathode leads arranged per JEDEC outline, making it mechanically interchangeable with other DO-201AD rectifiers like SB1240-E3/54 or MBR1245CT. However, electrical parameters such as V_RRM, V_F, and AEC-Q101 status must be verified individually; the SK12H45 is not a drop-in replacement unless those specs match the target design.

Does the SK12H45 have AEC-Q101 qualification, and what does that cover?

Yes, the SK12H45 is explicitly AEC-Q101 qualified per its ordering code suffix "H" and documentation in TSC's F2105 datasheet. This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life - validating the SK12H45 for use in automotive powertrain and chassis systems where reliability under thermal and vibration stress is mandatory.

What is the forward voltage specification for the SK12H45 at full rated current?

The SK12H45 has a maximum forward voltage (V_F) of 0.55 V at I_F = 12 A and T_J = 25°C, measured under pulse conditions (PW = 0.3 ms). This low V_F value is confirmed in the Electrical Specifications table of the TSC F2105 datasheet and directly contributes to reduced conduction loss and improved efficiency in high-current DC-DC applications using the SK12H45.

How is polarity indicated on the SK12H45 package?

Polarity on the SK12H45 is indicated by a visible cathode band on the molded DO-201AD case - the lead adjacent to the band is the cathode terminal, and the opposite lead is the anode. This marking aligns with industry-standard diode polarity conventions and is documented in the Marking Diagram section of the TSC F2105 datasheet, ensuring correct orientation during manual or automated placement of the SK12H45.

SK12H45 Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 45 V

Current - Average Rectified (Io):: 12A

Voltage - Forward (Vf) (Max) @ If:: 550 mV @ 12 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 120 µA @ 45 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

Operating Temperature - Junction:: 200°C (Max)

SK12H45 FAQ

1.How can I place an order for SK12H45 through Aetrix?

Please submit a Request for Quotation (RFQ) for SK12H45 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 SK12H45 reliable?

The price and inventory of SK12H45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK12H45 is usually 5 days.

3.What payment methods are accepted for SK12H45?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK12H45 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SK12H45?

SK12H45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SK12H45 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 SK12H45?

For technical support, including SK12H45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK12H45 requirements.

6.How does Aetrix verify that SK12H45 is sourced from the original manufacturer or authorized distributors?

All SK12H45 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 SK12H45 meets industry standards.

7.What is the process for return or replacement of SK12H45?

All SK12H45 units undergo pre-shipment inspection (PSI). If there is an issue with SK12H45, 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 SK12H45 part is unused and in its original packaging.

Return procedure for SK12H45:

1.Submit a request within 90 days.

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

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