Equivalent & Substitute Parts for SK12-TP Schottky Diode

Part Overview

The SK12-TP is a Schottky diode manufactured by Micro Commercial Co, rated for 20V DC reverse voltage and 1A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The SK12-TP serves as a fast recovery rectifier suitable for low-voltage power conversion applications requiring rapid switching characteristics.

Substiute Parts

SK12-TP

Micro Commercial CoIn Stock: 1816SK12-TP Datasheet

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5817SMJ/TR13

Microchip TechnologyIn Stock: 10395817SMJ/TR13 Datasheet

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B120B-13-F

Diodes IncorporatedIn Stock: 3329B120B-13-F Datasheet

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MBRS120T3G

onsemiIn Stock: 35380MBRS120T3G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SK12-TP is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 20V
• Current - Average Rectified (Io): 1A
• Technology: Schottky
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Variation Parameters:

• Voltage - Forward (Vf) (Max) @ If: Maximum 600 mV @ 1 A (SK12-TP baseline: 450 mV)
• Current - Reverse Leakage @ Vr: Maximum 1 mA @ 20 V (SK12-TP baseline: 500 µA)
• Operating Temperature - Junction: Minimum -55°C, Maximum 125°C (extended ranges acceptable)

Three active substitute parts meet these criteria: 5817SMJ/TR13 (Microchip Technology), B120B-13-F (Diodes Incorporated), and MBRS120T3G (onsemi).

Parameter Comparison

Engineering Selection Recommendations

5817SMJ/TR13 (Microchip Technology): This substitute provides identical forward voltage characteristics (450 mV @ 1 A) and matching reverse leakage specifications. The part is active and available in high inventory (967 pcs). However, this part is RoHS non-compliant, which may restrict use in applications requiring RoHS3 compliance. Operating temperature range extends to 150°C, providing thermal margin beyond the SK12-TP specification.

B120B-13-F (Diodes Incorporated): This substitute is ROHS3 compliant and offers the widest operating temperature range (-65°C ~ 150°C). Forward voltage is specified at 500 mV @ 1 A, representing a 50 mV increase over the SK12-TP baseline. Reverse leakage matches the SK12-TP at 500 µA @ 20 V. Inventory availability is highest among substitutes (3281 pcs). This part is suitable for applications where RoHS compliance is mandatory.

MBRS120T3G (onsemi): This substitute is ROHS3 compliant with the highest inventory availability (35300 pcs). Forward voltage is specified at 600 mV @ 1 A, representing a 150 mV increase over the SK12-TP baseline. Reverse leakage is specified at 1 mA @ 20 V. Operating temperature range is -65°C ~ 125°C, matching the SK12-TP upper limit. This part is suitable for applications where component availability and RoHS compliance are priorities, with tolerance for increased forward voltage drop.

Frequently Asked Questions (FAQ)

Q: Can the SK12-TP be directly replaced with any of these substitute parts?

A: All three substitute parts meet the mandatory electrical specifications for 20V, 1A Schottky diode operation in DO-214AA SMB packages. Direct replacement is electrically feasible. However, forward voltage and reverse leakage variations must be evaluated within the specific circuit application to ensure performance margins are maintained.

Q: What is the significance of the forward voltage differences between substitutes?

A: Forward voltage (Vf) determines the voltage drop across the diode during conduction. The SK12-TP specifies 450 mV @ 1 A. The B120B-13-F specifies 500 mV (50 mV higher), and the MBRS120T3G specifies 600 mV (150 mV higher). In power conversion circuits, higher forward voltage increases power dissipation and reduces efficiency. Circuit thermal analysis should account for these differences.

Q: Are there RoHS compliance considerations for substitution?

A: The SK12-TP is ROHS3 compliant. The 5817SMJ/TR13 is RoHS non-compliant, which may disqualify it for applications requiring RoHS certification. The B120B-13-F and MBRS120T3G are both ROHS3 compliant and are suitable replacements for RoHS-restricted applications.

Q: How do reverse leakage specifications affect circuit performance?

A: Reverse leakage current flows when the diode is reverse-biased. The SK12-TP and B120B-13-F specify 500 µA @ 20 V, while the 5817SMJ/TR13 and MBRS120T3G specify 1 mA @ 20 V. Higher reverse leakage increases standby power consumption and may affect precision analog circuits. Applications sensitive to leakage current should prioritize parts with lower reverse leakage specifications.

Q: What packaging differences exist between these substitutes?

A: The SK12-TP, 5817SMJ/TR13, and B120B-13-F are supplied in Tape & Reel (TR) packaging. The MBRS120T3G is supplied in Cut Tape (CT) & Digi-Reel® packaging. Both packaging formats are surface mount compatible. Procurement and assembly processes should verify compatibility with existing tape handling equipment.

Q: Can operating temperature range differences affect substitution decisions?

A: The SK12-TP operates from -55°C to 125°C. The 5817SMJ/TR13 and B120B-13-F extend to 150°C, providing additional thermal margin. The MBRS120T3G matches the SK12-TP upper limit at 125°C but extends the lower limit to -65°C. Applications operating near temperature extremes should select substitutes with appropriate thermal specifications.

Q: Is inventory availability a factor in substitution selection?

A: Inventory levels are provided for reference. The MBRS120T3G has the highest availability (35300 pcs), followed by B120B-13-F (3281 pcs) and 5817SMJ/TR13 (967 pcs). For high-volume production or long-term supply chain planning, higher inventory levels may reduce procurement risk.