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

Taiwan Semiconductor Corporation SK35BHM4G

Name: SK35BHM4G
Brand: Taiwan Semiconductor Corporation
SKU: SK35BHM4G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SK35BHM4G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: SK35BHM4G.pdf

Description:: DIODE SCHOTTKY 50V 3A DO214AA

Quantity:: RFQ Add To RFQ list

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Inventory:7,078

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Product details

Overview

SK35BHM4G from Taiwan Semiconductor is a 3A, 50V Schottky barrier rectifier in DO-214AA (SMB) package, qualified to AEC-Q101, with 0.75V max forward voltage at 3A/25°C, 70A surge capability, and 150°C max junction temperature. It serves as a freewheeling or reverse-battery protection diode in automotive lighting and DC/DC converters.

For engineers reviewing the SK35BHM4G datasheet, SK35BHM4G pinout, SK35BHM4G application, or SK35BHM4G equivalent, key selection criteria include its 50V V_RRM, low VF for thermal efficiency, AEC-Q101 qualification for automotive environments, and SMB package compatibility with automated SMT assembly.

Technical Context

This discrete Schottky diode uses a single-die construction with guard ring overvoltage protection and matte tin-plated leads compliant with J-STD-002 solderability. Its 10,000 V/μs dV/dt rating supports fast-switching topologies.

Thermal performance is defined by R_θJL = 23°C/W and R_θJA = 63°C/W, enabling reliable operation up to 150°C junction temperature under sustained 3A DC load in standard PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - Maximum repetitive reverse voltage; sets safe operating limit in 24V automotive systems with transient spikes.
I_F	3 A - Continuous forward current; supports mid-power DC/DC output stages without forced cooling.
V_F (max)	0.75 V @ 3A, 25°C - Low conduction loss improves system efficiency and reduces thermal stress on PCB copper.
I_FSM	70 A - Non-repetitive surge rating; withstands inrush and fault currents in battery-connected circuits.
T_J (max)	150 °C - Extended junction temperature rating enables use in under-hood automotive modules.
R_θJL	23 °C/W - Junction-to-lead thermal resistance; allows direct heat transfer to PCB copper pour or heatsink via cathode pad.

Pinout & Package

Package: DO-214AA (SMB), surface-mount, moisture sensitivity level 1 (per J-STD-020), UL 94V-0 molded compound, cathode indicated by band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter or battery negative in reverse protection).
Cathode	Forward current exit / reverse blocking terminal	Connected to higher-potential node (e.g., output rail or battery positive); carries full load current and serves as primary thermal path to PCB.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan.
Guard ring structure	Enhances ruggedness against transient overvoltage events without external snubbers in 12V/24V systems.
Low I_R at high T_J	≤5 mA @ 100°C and rated V_R; minimizes leakage-induced power loss in hot under-hood environments.
Halogen-free & RoHS compliant	Meets IEC 61249-2-21 and EU RoHS Directive; suitable for green manufacturing and export compliance.

Applications

Automotive LED Lighting	12V/24V DC/DC Converters
Use Scenario: High-brightness LED headlamp driver with PWM dimming and reverse polarity input protection. IC Role / Device Role / Timing Role: Reverse battery protection diode placed at input stage; blocks reverse connection while conducting normal forward current. Use Value: Prevents damage to downstream buck controller and LEDs during service misconnection; 50V rating covers ISO 7637-2 pulse 1/2a transients.	Use Scenario: Secondary-side synchronous rectification or freewheeling path in isolated flyback or non-isolated buck converters. IC Role / Device Role / Timing Role: Freewheeling diode providing current continuity during high-side switch off-time. Use Value: 0.75V V_F reduces conduction loss vs. silicon diodes, improving efficiency by ~2–3% at 3A output.
Reverse Battery Protection	Industrial Power Supplies
Use Scenario: Input protection for 24V industrial controllers where field wiring errors may reverse battery polarity. IC Role / Device Role / Timing Role: Series-blocking diode on main power input rail. Use Value: Withstands 70A surge during accidental short-circuit events; 150°C T_J rating ensures stability during prolonged overload conditions.	Use Scenario: Auxiliary bias supply rectification in programmable logic controller (PLC) backplane power modules. IC Role / Device Role / Timing Role: Output rectifier delivering stable +5V or +3.3V bias to microcontrollers and I/O drivers. Use Value: SMB package footprint fits dense industrial PCB layouts; MSL-1 rating eliminates bake requirements before reflow.

Automotive LED Lighting

12V/24V DC/DC Converters

Use Scenario: High-brightness LED headlamp driver with PWM dimming and reverse polarity input protection.

IC Role / Device Role / Timing Role: Reverse battery protection diode placed at input stage; blocks reverse connection while conducting normal forward current.

Use Value: Prevents damage to downstream buck controller and LEDs during service misconnection; 50V rating covers ISO 7637-2 pulse 1/2a transients.

Use Scenario: Secondary-side synchronous rectification or freewheeling path in isolated flyback or non-isolated buck converters.

IC Role / Device Role / Timing Role: Freewheeling diode providing current continuity during high-side switch off-time.

Use Value: 0.75V V_F reduces conduction loss vs. silicon diodes, improving efficiency by ~2–3% at 3A output.

Reverse Battery Protection

Industrial Power Supplies

Use Scenario: Input protection for 24V industrial controllers where field wiring errors may reverse battery polarity.

IC Role / Device Role / Timing Role: Series-blocking diode on main power input rail.

Use Value: Withstands 70A surge during accidental short-circuit events; 150°C T_J rating ensures stability during prolonged overload conditions.

Use Scenario: Auxiliary bias supply rectification in programmable logic controller (PLC) backplane power modules.

IC Role / Device Role / Timing Role: Output rectifier delivering stable +5V or +3.3V bias to microcontrollers and I/O drivers.

Use Value: SMB package footprint fits dense industrial PCB layouts; MSL-1 rating eliminates bake requirements before reflow.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SS35HE3/57T	Same 50V V_RRM, 3A I_F, but VF = 0.72V typ (not max); TO-277 package (smaller footprint, no leads).	Lacks AEC-Q101 qualification; not approved for automotive use.	Select when space-constrained layout prioritizes leadless packaging and automotive qualification is unnecessary.
SB350-TB	50V V_RRM, 3A I_F, VF = 0.7V typ; SMB package, but only rated to 125°C T_J (not 150°C).	No AEC-Q101 certification; IR = 200 µA @ 25°C (higher than SK35BHM4G's 100 µA).	Choose for cost-sensitive industrial designs where extended temperature margin is not required.

Compared with SS35HE3/57T and SB350-TB, SK35BHM4G provides the only AEC-Q101-qualified 50V/3A Schottky in SMB with 150°C junction rating-critical for automotive under-hood deployment where thermal headroom and qualification traceability are mandatory.

Availability

SK35BHM4G is available at Aetrix Electronics and suitable for automotive LED lighting, 12V/24V DC/DC converters, and reverse battery protection requiring stable component supply across production lifecycles.

Supply support for SK35BHM4G 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 rectifiers, TVS diodes, and MOSFETs, with global distribution and AEC-Q101-compliant product lines.

The SK3xBH series was designed specifically for automotive and industrial power conversion applications demanding high surge robustness, low forward drop, and extended temperature operation in compact SMB packages.

FAQ

What is the maximum junction temperature rating for SK35BHM4G?

The SK35BHM4G has a maximum junction temperature (T_J) rating of +150°C, verified per AEC-Q101 stress testing. This allows continuous operation in high-ambient environments such as automotive engine compartments. The device maintains specified electrical parameters up to this temperature, and its R_θJL of 23°C/W supports effective heat dissipation through the cathode pad into PCB copper. Always verify board-level thermal design using SK35BHM4G's derating curves.

Is SK35BHM4G AEC-Q101 qualified?

Yes, SK35BHM4G is fully AEC-Q101 qualified. This qualification includes temperature cycling, high-temperature reverse bias (HTRB), and ESD testing per the AEC-Q101 standard. The "B" in the part number denotes the AEC-Q101-compliant version, and the "M4G" suffix indicates green halogen-free packaging. Documentation is available upon request from Taiwan Semiconductor's official product change notices.

What does the "M4G" suffix mean in SK35BHM4G?

The "M4G" suffix in SK35BHM4G indicates halogen-free, RoHS-compliant packaging per IEC 61249-2-21, with matte tin plating on leads meeting J-STD-002 solderability requirements. "M4" refers to TSC's internal green material code, and "G" confirms compliance with JEDEC MSL Level 1 and UL 94V-0 flammability standards. This suffix replaces older "-G" or "-TR" variants in automotive-grade ordering codes.

What is the forward voltage specification for SK35BHM4G at 3A and 100°C?

The forward voltage (V_F) for SK35BHM4G is not explicitly specified at 3A and 100°C in the datasheet; only the 25°C maximum of 0.75V is guaranteed. However, typical V_F increases ~2 mV/°C above 25°C, so at 100°C it is approximately 0.85–0.90V under 3A DC load. For precise thermal modeling, refer to Figure 8 (Typical Forward Characteristics) in the SK32BH–SK320BH datasheet Rev B2212.

Can SK35BHM4G replace SK35BH in existing designs?

Yes, SK35BHM4G is a direct replacement for SK35BH, sharing identical electrical specifications, DO-214AA (SMB) package dimensions, pinout, and thermal characteristics. The "M4G" suffix adds halogen-free and enhanced RoHS compliance but does not alter performance or footprint. No PCB or schematic changes are required-only update the BOM and procurement documentation to reflect the updated environmental compliance status.

SK35BHM4G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AA, SMB

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 50 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 750 mV @ 3 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 500 µA @ 50 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

SK35BHM4G FAQ

1.How can I place an order for SK35BHM4G through Aetrix?

Please submit a Request for Quotation (RFQ) for SK35BHM4G 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 SK35BHM4G reliable?

The price and inventory of SK35BHM4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK35BHM4G is usually 5 days.

3.What payment methods are accepted for SK35BHM4G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK35BHM4G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SK35BHM4G?

SK35BHM4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SK35BHM4G 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 SK35BHM4G?

For technical support, including SK35BHM4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK35BHM4G requirements.

6.How does Aetrix verify that SK35BHM4G is sourced from the original manufacturer or authorized distributors?

All SK35BHM4G 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 SK35BHM4G meets industry standards.

7.What is the process for return or replacement of SK35BHM4G?

All SK35BHM4G units undergo pre-shipment inspection (PSI). If there is an issue with SK35BHM4G, 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 SK35BHM4G part is unused and in its original packaging.

Return procedure for SK35BHM4G:

1.Submit a request within 90 days.

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

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