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Taiwan Semiconductor Corporation SK12BHM4G
- Part No.:
- SK12BHM4G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SK12BHM4G.pdf
- Description:
- DIODE SCHOTTKY 20V 1A DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,473
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Product details
Overview
SK12BHM4G from Taiwan Semiconductor is a 1 A, 20 V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, featuring 0.50 V forward voltage at 1 A and 500 µA reverse leakage at 25°C. It delivers high surge current capability (30 A IFSM), operates up to 125°C junction temperature, and is optimized for switching mode power supplies and AC/DC adapters.
For engineers reviewing the SK12BHM4G datasheet, SK12BHM4G pinout, SK12BHM4G application, or SK12BHM4G equivalent, this page provides verified electrical parameters, thermal performance data, polarity marking details, JEDEC-compliant SMB package dimensions, and RoHS/halogen-free compliance status required for board-level design validation and supply chain qualification.
Technical Context
The SK12BHM4G implements a single-die Schottky barrier structure with guard ring overvoltage protection, enabling fast recovery and low conduction loss. Its 25°C/W junction-to-lead thermal resistance supports stable operation under continuous 1 A forward current with appropriate PCB copper area.
Rated for repetitive peak reverse voltage of 20 V and RMS reverse voltage of 14 V, it meets JESD201 Class 2 whisker resistance and J-STD-020 moisture sensitivity Level 1 - confirming suitability for standard reflow assembly without dry-pack requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF (Continuous Forward Current) | 1 A - supports sustained output rectification in compact 5–20 W SMPS designs |
| VRRM (Repetitive Peak Reverse Voltage) | 20 V - defines maximum allowable reverse bias before breakdown in DC-DC secondary-side or low-voltage auxiliary rails |
| VF @ 1 A, 25°C | 0.50 V - enables <0.5 W conduction loss per device at full load, reducing thermal stress |
| IFSM (Surge Current) | 30 A - withstands 8.3 ms half-sine surges common during AC line turn-on or transient events |
| TJ max | 125°C - specifies absolute maximum junction temperature; derating required above ambient 70°C |
| RθJL | 25°C/W - quantifies thermal path efficiency from die to lead; informs minimum copper pour area needed for thermal management |
| IR @ VRRM, 25°C | 500 µA - low leakage preserves efficiency in standby and light-load conditions |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode indicated by molded band; matte tin-plated leads compliant with J-STD-002 solderability; weight ≈ 0.093 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., transformer secondary center-tap or switch node return) |
| Cathode | Forward current exit / reverse blocking terminal | Marked by visible band; ties to output rail or filter capacitor positive; blocks reverse voltage up to 20 V |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Enhances ruggedness against transient overvoltage spikes without external snubbers |
| Moisture sensitivity level 1 | Eliminates bake requirement prior to reflow; compatible with standard SMT lines |
| UL 94V-0 molding compound | Meets flame-retardancy requirements for end-equipment safety certifications |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and global environmental directives for industrial and consumer products |
Applications
| AC/DC Adapters | USB Power Delivery (5 V Output) |
|---|---|
Use Scenario: Secondary-side rectification in 5–15 W wall adapters converting 90–264 VAC to regulated 5 VDC. IC Role / Device Role / Timing Role: Uncontrolled Schottky rectifier replacing slower diodes to reduce conduction loss and improve efficiency. Use Value: 0.50 V VF minimizes power dissipation versus 0.7–1.1 V silicon diodes, enabling smaller heatsinks and higher power density. | Use Scenario: Output rectification in USB-C PD 5 V fixed-output buck-boost converters. IC Role / Device Role / Timing Role: Low-loss freewheeling path during synchronous rectifier dead-time or as primary rectifier in non-synchronous topologies. Use Value: 500 µA IR at 25°C ensures minimal standby leakage, supporting Energy Star Level VI and EU CoC v5 compliance. |
| LED Driver Secondary Rectification | Industrial 24 V Auxiliary Supply |
Use Scenario: Constant-current LED driver output stage delivering 350 mA–700 mA to strings of white LEDs. IC Role / Device Role / Timing Role: High-efficiency output rectifier handling pulsed or quasi-continuous forward current. Use Value: 30 A IFSM rating accommodates inrush currents during cold-start without degradation. | Use Scenario: 24 V isolated auxiliary supply powering control logic and gate drivers in motor drives or PLC modules. IC Role / Device Role / Timing Role: Input rectifier for offline flyback or forward converter feeding 24 V regulation stage. Use Value: 125°C TJ max allows reliable operation in enclosed enclosures with ambient up to 70°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS12 (Diodes Inc.) | Same 20 V VRRM, 1 A IF, but VF = 0.55 V (max) at 1 A; RθJL = 30°C/W | Slightly higher conduction loss and thermal resistance; requires larger copper area for same thermal margin | Acceptable where layout space permits minor thermal derating |
| SB120 (ON Semiconductor) | 20 V VRRM, 1 A IF, VF = 0.52 V (typ), IR = 100 µA (max) at 25°C - tighter leakage spec | Lower leakage improves light-load efficiency; identical SMB footprint and pinout | Preferred for ultra-low standby power designs requiring sub-200 µA IR |
Compared with SS12 and SB120, the SK12BHM4G offers the lowest typical forward voltage (0.50 V) and best thermal resistance (25°C/W), making it optimal for thermally constrained, high-efficiency 20 V rectification where minimal conduction loss is critical.
Availability
SK12BHM4G is available at Aetrix Electronics and suitable for AC/DC adapters, USB power delivery systems, and industrial auxiliary supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SK12BHM4G 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 global power management and industrial markets since 1979.
The SK12BHM4G belongs to TSC's SK1xB Schottky rectifier family, engineered specifically for high-efficiency, cost-sensitive secondary-side rectification in compact offline power converters operating below 20 V output.
FAQ
What is the maximum junction temperature rating for SK12BHM4G?
The SK12BHM4G has a maximum junction temperature (TJ max) of +125°C. This rating applies under steady-state conditions with proper thermal management - including adequate PCB copper area and airflow. Operation beyond this limit risks irreversible parametric shift or catastrophic failure. Derating curves in the official datasheet must be followed when ambient exceeds 70°C.
Does SK12BHM4G have a specified forward voltage at elevated temperature?
Yes, the SK12BHM4G datasheet specifies forward voltage (VF) only at TJ = 25°C (0.50 V typ at 1 A). While VF decreases with rising temperature in Schottky diodes, no guaranteed maximum VF is provided at 100°C or 125°C. Designers should verify actual VF using thermal simulation or bench testing under worst-case thermal conditions.
Is SK12BHM4G pin-compatible with other DO-214AA (SMB) Schottky rectifiers?
Yes, SK12BHM4G uses the standard DO-214AA (SMB) package with anode and cathode terminals arranged per JEDEC outline. It shares mechanical compatibility with all SMB-packaged Schottky rectifiers, including SS12, SB120, and MBR120. Polarity is marked by a cathode band, matching industry-standard orientation.
What is the moisture sensitivity level (MSL) of SK12BHM4G and what does it mean for assembly?
The SK12BHM4G is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH and is safe for standard reflow soldering without baking or dry-pack handling. This eliminates pre-bake steps and simplifies manufacturing logistics for high-volume SMT lines.
How does the guard ring feature in SK12BHM4G improve reliability?
The guard ring in SK12BHM4G enhances edge termination robustness, suppressing premature avalanche breakdown under transient overvoltage conditions such as line surges or inductive kickback. This extends operational lifetime in unregulated or lightly filtered input stages without requiring additional external clamping components.
SK12BHM4G 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):
- 20 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 20 V
- Capacitance @ Vr, F:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
- Operating Temperature - Junction:
- -55°C ~ 125°C
SK12BHM4G FAQ
1.How can I place an order for SK12BHM4G through Aetrix?
Please submit a Request for Quotation (RFQ) for SK12BHM4G 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 SK12BHM4G reliable?
The price and inventory of SK12BHM4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK12BHM4G is usually 5 days.
3.What payment methods are accepted for SK12BHM4G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK12BHM4G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK12BHM4G?
SK12BHM4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK12BHM4G 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 SK12BHM4G?
For technical support, including SK12BHM4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK12BHM4G requirements.
6.How does Aetrix verify that SK12BHM4G is sourced from the original manufacturer or authorized distributors?
All SK12BHM4G 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 SK12BHM4G meets industry standards.
7.What is the process for return or replacement of SK12BHM4G?
All SK12BHM4G units undergo pre-shipment inspection (PSI). If there is an issue with SK12BHM4G, 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 SK12BHM4G part is unused and in its original packaging.
Return procedure for SK12BHM4G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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