SK12-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SK12-13 is a 20V, 1A Schottky rectifier diode in DO-214AA (SMB) surface mount package manufactured by Diodes Incorporated. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing production and repair applications. Schottky diodes in this voltage and current class are widely used in power supply circuits, voltage regulation, and reverse polarity protection applications where fast switching and low forward voltage drop are required.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	20 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 20 V
Capacitance @ Vr, F	110pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB
Operating Temperature - Junction	-65°C ~ 125°C
Technology	Schottky
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the SK12-13 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage rating: 20V DC reverse voltage (Vr) minimum
Package type: DO-214AA (SMB) surface mount configuration
Technology: Schottky diode
Mounting: Surface mount

Secondary Compatibility Factors:

Current rating: Equal to or greater than 1A average rectified current
Forward voltage: Acceptable within circuit design margins
Reverse leakage: Consistent with 500 µA @ 20V specification
Speed characteristics: Fast recovery ≤ 500ns for > 200mA

The substitute parts listed maintain identical voltage and package specifications. Current ratings may exceed the original 1A specification, which is acceptable in substitution applications as higher current-rated devices operate within the lower current envelope. Operating temperature range variations are noted but do not preclude substitution where the application temperature remains within the substitute part's specified range.

Parameter Comparison

Parameter	SK12-13 (Diodes Inc)	CMSH1-20 TR13 PBFREE (Central Semi)	SK32B-LTP (Micro Commercial)	SK42BL-TP (Micro Commercial)
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	20 V	20 V
Current - Average Rectified (Io)	1 A	1 A	3 A	4 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 1 A	550 mV @ 1 A	500 mV @ 3 A	450 mV @ 4 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	500 µA @ 20 V	500 µA @ 20 V	500 µA @ 20 V	500 µA @ 20 V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-65°C ~ 125°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Technology	Schottky	Schottky	Schottky	Schottky
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount

Engineering Selection Recommendations

CMSH1-20 TR13 PBFREE (Central Semiconductor Corp)

This substitute provides direct electrical equivalence to the SK12-13 with identical 1A current rating and 20V voltage specification. The CMSH1-20 TR13 PBFREE maintains the same forward voltage characteristic (550 mV @ 1 A) and reverse leakage specification. Product status is Active, ensuring continued availability. RoHS3 compliance and REACH unaffected status provide regulatory advantage over the non-compliant SK12-13. Operating temperature range extends to 150°C, providing superior thermal margin. Packaging is Tape & Reel (TR), suitable for automated assembly processes.

SK32B-LTP (Micro Commercial Co)

This substitute provides higher current capacity (3A) within the same 20V voltage class and DO-214AA package. Forward voltage is reduced to 500 mV @ 3 A, indicating improved efficiency characteristics. Product status is Not For New Designs, indicating limited future availability. RoHS3 compliance is present. Operating temperature range is -55°C ~ 150°C. This option is suitable for applications requiring current margin above 1A within existing thermal and spatial constraints.

SK42BL-TP (Micro Commercial Co)

This substitute provides maximum current capacity (4A) within the 20V voltage specification and DO-214AA package. Forward voltage is further reduced to 450 mV @ 4 A. Product status is Not For New Designs, indicating this is a legacy option with limited future procurement viability. RoHS3 compliance is present. Operating temperature range is -55°C ~ 150°C. This option is suitable only where current capacity significantly exceeds 1A and legacy component continuity is required.

Frequently Asked Questions (FAQ)

Q: Can SK32B-LTP or SK42BL-TP be used as direct replacements for SK12-13 in a 1A circuit?

A: Yes. Both parts maintain the 20V voltage rating and DO-214AA package configuration. The higher current ratings (3A and 4A respectively) do not prevent operation in 1A circuits. The diodes will operate within their safe operating region at reduced current levels. Forward voltage characteristics differ slightly but remain within typical circuit design tolerances for Schottky applications.

Q: What is the primary advantage of CMSH1-20 TR13 PBFREE over the original SK12-13?

A: The CMSH1-20 TR13 PBFREE provides identical electrical specifications with Active product status, ensuring continued availability. RoHS3 compliance addresses regulatory requirements that the non-compliant SK12-13 does not meet. Extended operating temperature range to 150°C provides additional thermal margin.

Q: Are there package compatibility concerns when substituting these parts?

A: All substitute parts use the DO-214AA (SMB) package, identical to the SK12-13. Surface mount footprints are compatible across all listed alternatives. No PCB layout modifications are required.

Q: How do reverse leakage specifications compare across all options?

A: All parts, including the original SK12-13 and all three substitutes, specify 500 µA @ 20V reverse leakage current. This parameter is consistent across the entire substitution group.

Q: What is the significance of the "Not For New Designs" status on SK32B-LTP and SK42BL-TP?

A: This status indicates the manufacturer does not recommend these parts for new circuit designs and may discontinue production. While suitable for replacement and repair of existing applications, these parts should not be selected for new product development. CMSH1-20 TR13 PBFREE with Active status is preferred for new designs.

Q: Do operating temperature ranges affect substitution suitability?

A: Operating temperature ranges should be verified against application requirements. The SK12-13 operates -65°C ~ 125°C. CMSH1-20 TR13 PBFREE extends to 150°C. SK32B-LTP and SK42BL-TP operate -55°C ~ 150°C. If the application requires operation below -55°C, only SK12-13 or CMSH1-20 TR13 PBFREE are suitable. For standard industrial temperature ranges, all substitutes are acceptable.

Q: What packaging formats are available for these substitutes?

A: CMSH1-20 TR13 PBFREE is supplied in Tape & Reel (TR) format. SK32B-LTP is supplied in Cut Tape (CT) & Digi-Reel format. SK42BL-TP is supplied in Tape & Reel (TR) format. Selection should align with assembly process requirements and inventory management practices.

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