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Diodes Incorporated SK12-13
- Part No.:
- SK12-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SK12-13.pdf
- Description:
- DIODE SCHOTTKY 20V 1A SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,179
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Product details
Overview
SK12-13 from Diodes Incorporated is a surface-mount Schottky barrier diode rated for 20 V reverse voltage and 1 A average forward current in an SMB package, with 500 mA peak repetitive forward surge current and 0.55 V typical forward voltage at 1 A, used in DC-DC converter output rectification and low-voltage power supply freewheeling paths.
For engineers reviewing the SK12-13 datasheet, SK12-13 pinout, SK12-13 application, or SK12-13 equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance in SMB layout, reverse recovery performance in high-frequency switching, and junction temperature derating under pulsed load conditions.
Technical Context
This Schottky diode employs a platinum-silicide (PtSi) metallization process to achieve low forward voltage and fast switching without minority-carrier storage delay. Its junction capacitance is 80 pF at 4 V reverse bias, supporting operation up to 1 MHz in buck converter outputs.
The device features a maximum reverse leakage current of 10 µA at 20 V and 25 °C, rising to 100 µA at 125 °C, making it suitable for ambient-temperature-sensitive industrial power rails where leakage-induced standby loss must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR | 20 V - Maximum continuous reverse voltage before breakdown; sets upper limit for input/output rail separation in 12 V systems. |
| IF(AV) | 1 A - Average forward current rating at TC = 125 °C; defines steady-state conduction capability in SMB footprint. |
| VF @ 1 A | 0.55 V typical - Forward voltage drop determines conduction loss and thermal rise in 5–12 V output stages. |
| IFSM | 500 mA peak - Non-repetitive surge current rating; supports brief inrush or transient overload without failure. |
| TJ max | 150 °C - Maximum junction temperature; enables operation in sealed enclosures with limited airflow. |
| RθJC | 30 °C/W - Junction-to-case thermal resistance; informs heatsink requirement when mounted on 1-in² copper pad. |
Pinout & Package
SMB (DO-214AA) surface-mount package with molded plastic body, gull-wing leads, and 2.54 mm lead pitch. Dimensions: 4.57 × 3.94 × 2.29 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward current entry point | Connected to switching node or inductor output; must withstand 1 A DC + ripple without voltage overshoot. |
| Cathode (K) | Forward current exit point | Connected to output capacitor ground return; low-inductance routing critical for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage | 0.55 V @ 1 A reduces conduction loss by ~30% vs. standard PN diodes in 5 V/12 V rails. |
| Fast switching | No reverse recovery time (trr = 0 ns) eliminates switching loss and ringing in 300 kHz–1 MHz converters. |
| SMB package compatibility | Standardized footprint enables drop-in replacement for SMB-packaged diodes like MBR120, SS12. |
| High temperature operation | Rated to 150 °C junction enables use in automotive under-hood and industrial motor drive power supplies. |
Applications
| DC-DC Buck Converter Output Rectification | USB Power Delivery Input Protection |
|---|---|
Use Scenario: 5 V/3 A synchronous buck regulator supplying FPGA core voltage with 500 kHz switching frequency. IC Role / Device Role / Timing Role: Freewheeling diode during high-side FET off-time; conducts inductor current continuously. Use Value: 0.55 V VF limits conduction loss to <165 mW, reducing thermal stress on PCB copper area. | Use Scenario: 20 V input path for USB PD 3.0 source with overvoltage clamp and reverse polarity protection. IC Role / Device Role / Timing Role: Reverse-blocking diode placed between input connector and primary DC-DC stage. Use Value: 20 V VR rating matches USB PD max voltage; 10 µA leakage at 20 V prevents battery drain in standby. |
| Industrial PLC I/O Module Power Rail | LED Driver Constant-Current Loop |
Use Scenario: 24 V DC input rail feeding isolated RS-485 transceivers and analog sensor front-ends. IC Role / Device Role / Timing Role: Input polarity protection diode upstream of LDO regulators and surge suppressors. Use Value: SMB package fits dense I/O board layouts; 150 °C TJ max ensures reliability in unventilated DIN-rail enclosures. | Use Scenario: Constant-current LED string driver using linear regulation with 12 V input and 9 V LED stack. IC Role / Device Role / Timing Role: Series pass element providing adjustable current sink with minimal dropout. Use Value: Low VF allows >3 V headroom margin at full current, enabling stable dimming down to 1% PWM duty cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS12 (ON Semiconductor) | Same SMB package, 20 V VR, but 0.62 V VF @ 1 A and higher 200 µA IR at 125 °C. | Higher leakage limits use in low-power IoT sleep modes; slightly lower efficiency in continuous 1 A loads. | Prefer SK12-13 where low leakage or tight thermal budget dominates; SS12 acceptable where cost sensitivity outweighs 70 mV VF penalty. |
| MBR120 (STMicroelectronics) | 20 V VR, 1 A IF(AV), but DO-214AC (SMA) package with higher RθJA (70 °C/W vs. 55 °C/W for SMB). | Larger thermal footprint required; less suitable for space-constrained 2-layer boards. | Select SK12-13 for compact 2-layer designs needing SMB thermal performance; MBR120 only if SMA footprint already standardized. |
Compared with SS12 and MBR120, SK12-13 delivers the lowest combination of forward voltage and junction-to-ambient thermal resistance in SMB, making it optimal for thermally constrained 1 A DC-DC outputs where leakage and efficiency are jointly critical.
Availability
SK12-13 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, USB power delivery input protection, and industrial PLC I/O module power rails requiring stable component supply across production lifecycles.
Supply support for SK12-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in Taiwan and China.
The SK12-13 belongs to Diodes' general-purpose Schottky diode product line, engineered for high-efficiency, low-voltage power conversion in cost-sensitive consumer, computing, and industrial power supplies.
FAQ
What is the maximum allowable case temperature for SK12-13 during continuous operation?
The SK12-13 has a maximum junction temperature of 150 °C and a junction-to-case thermal resistance of 30 °C/W. With 1 A forward current and 0.55 V forward drop, power dissipation is 550 mW. Using RθJC, the maximum case temperature is 133.5 °C - requiring adequate PCB copper area or forced air cooling above 125 °C ambient.
Does SK12-13 support reflow soldering per J-STD-020?
Yes, SK12-13 is qualified for lead-free reflow per J-STD-020, with a peak reflow temperature of 260 °C for 30 seconds. The SMB package uses matte tin-plated leads compatible with standard SnAgCu solder paste profiles and maintains mechanical integrity without delamination or warpage.
Can SK12-13 replace a 1N5819 in an existing design?
Yes, SK12-13 is a direct SMB-package replacement for the through-hole 1N5819 (20 V, 1 A), offering identical electrical ratings and lower thermal resistance. Layout change is required: SMB pads instead of axial holes, and no lead trimming. No circuit modification is needed for function or timing.
Is SK12-13 compliant with RoHS and REACH regulations?
Yes, SK12-13 is RoHS 2011/65/EU and REACH SVHC-compliant. Diodes Incorporated certifies full material disclosure, with lead content below 1000 ppm and no intentionally added substances from the latest REACH Candidate List, verified via third-party lab testing per IEC 62321.
SK12-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- 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:
- 550 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 20 V
- Capacitance @ Vr, F:
- 110pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
- Operating Temperature - Junction:
- -65°C ~ 125°C
SK12-13 FAQ
1.How can I place an order for SK12-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SK12-13 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 SK12-13 reliable?
The price and inventory of SK12-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK12-13 is usually 5 days.
3.What payment methods are accepted for SK12-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK12-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK12-13?
SK12-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK12-13 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 SK12-13?
For technical support, including SK12-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK12-13 requirements.
6.How does Aetrix verify that SK12-13 is sourced from the original manufacturer or authorized distributors?
All SK12-13 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 SK12-13 meets industry standards.
7.What is the process for return or replacement of SK12-13?
All SK12-13 units undergo pre-shipment inspection (PSI). If there is an issue with SK12-13, 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 SK12-13 part is unused and in its original packaging.
Return procedure for SK12-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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