SK38B-LTP Equivalent & Substitute Parts

Part Overview

The SK38B-LTP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 80 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Identifying equivalent and substitute parts is necessary for applications requiring continued supply, design updates, or component availability optimization.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	80 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 80 V
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SK38B-LTP is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 80 V
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Current Rating Consideration: The SK38B-LTP is rated for 3 A average rectified current. Substitute parts may have equal or higher current ratings while maintaining all other electrical specifications. Parts with lower current ratings (1 A, 2 A) are classified as similar parts rather than direct equivalents, as they represent reduced capability.

Direct Equivalent: SK38B/TR13 (Microsemi Corporation) matches all critical parameters including the 3 A current rating and identical electrical characteristics.

Similar Parts (Reduced Current Rating): B180B-13-F (1 A) and B280-13-F (2 A) maintain voltage, package, and technology specifications but operate at lower current ratings, suitable for applications with reduced current requirements.

Similar Parts (Equivalent Current Rating): SS28 (onsemi) provides 2 A rating with matching voltage and package specifications.

Parameter Comparison

Parameter	SK38B-LTP (Main)	SK38B/TR13	B180B-13-F	B280-13-F	SS28
Manufacturer	Micro Commercial Co	Microsemi Corporation	Diodes Incorporated	Diodes Incorporated	onsemi
Voltage - DC Reverse (Vr) (Max)	80 V	80 V	80 V	80 V	80 V
Current - Average Rectified (Io)	3 A	3 A	1 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	850 mV @ 3 A	790 mV @ 1 A	790 mV @ 2 A	850 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 80 V	500 µA @ 80 V	500 µA @ 80 V	7 mA @ 80 V	400 µA @ 80 V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 125°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 125°C
Product Status	Not For New Designs	Active	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (3 A Current Requirement):

SK38B/TR13 (Microsemi Corporation) is the direct equivalent, matching the 3 A current rating and all electrical specifications. However, this part carries RoHS non-compliant status, which may conflict with regulatory requirements in applications subject to RoHS3 compliance mandates. The operating temperature range is reduced to -55°C ~ 125°C compared to the main part's -55°C ~ 150°C, requiring verification for high-temperature applications.

For RoHS3-Compliant Replacement with Reduced Current Rating:

B280-13-F (Diodes Incorporated) provides 2 A current rating with ROHS3 compliance and extended operating temperature range (-65°C ~ 150°C). This part is suitable for applications where 2 A current capacity is sufficient and regulatory compliance is mandatory. Reverse leakage current is elevated at 7 mA @ 80 V compared to 500 µA in the main part.

B180B-13-F (Diodes Incorporated) provides 1 A current rating with ROHS3 compliance and extended operating temperature range (-65°C ~ 150°C). This part is suitable for lower-current applications requiring regulatory compliance.

For Active Product Status with Equivalent Current Rating:

SS28 (onsemi) provides 2 A current rating with active product status and ROHS3 compliance. Operating temperature range is -65°C ~ 125°C. This part is classified as "Not For New Designs" status, limiting its suitability for new design implementations.

Frequently Asked Questions (FAQ)

Q: Can SK38B/TR13 be used as a direct replacement for SK38B-LTP?

A: SK38B/TR13 matches all electrical specifications including the 3 A current rating, reverse voltage, forward voltage, and fast recovery speed. However, it is RoHS non-compliant and has a reduced maximum operating junction temperature of 125°C versus 150°C. Compatibility depends on regulatory requirements and thermal operating conditions of the application.

Q: What is the difference between a direct equivalent and a similar part?

A: A direct equivalent maintains all critical electrical parameters including current rating. SK38B/TR13 is a direct equivalent at 3 A. Similar parts such as B280-13-F (2 A) and B180B-13-F (1 A) maintain voltage, package, and technology specifications but operate at lower current ratings, suitable only for applications with reduced current requirements.

Q: Can B280-13-F replace SK38B-LTP in all applications?

A: B280-13-F can replace SK38B-LTP only in applications where the circuit current requirement does not exceed 2 A. The part provides superior compliance status (ROHS3) and extended temperature range (-65°C ~ 150°C). However, reverse leakage current is significantly higher at 7 mA @ 80 V compared to 500 µA, which may affect circuit performance in sensitive applications.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use the DO-214AA (SMB) surface mount package, ensuring mechanical and thermal compatibility. Tape & Reel (TR) and Cut Tape (CT) packaging options vary by manufacturer and supplier, but the component footprint and mounting characteristics remain identical.

Q: Why is the SK38B-LTP marked "Not For New Designs"?

A: This designation indicates the part has been superseded by the manufacturer and is no longer recommended for new product development. Existing inventory remains available for legacy system support and maintenance. New designs should utilize active-status alternatives such as B280-13-F or B180B-13-F from Diodes Incorporated.

Q: What is the impact of RoHS compliance status on part selection?

A: RoHS3 compliance is mandatory for products sold in the European Union and many other regulated markets. SK38B/TR13 is RoHS non-compliant, which may restrict its use in new designs or regulated applications. B180B-13-F, B280-13-F, and SS28 are all ROHS3 compliant, meeting regulatory requirements for restricted substances.

Q: How does operating temperature range affect substitution?

A: SK38B-LTP operates from -55°C to 150°C. SK38B/TR13 is limited to 125°C maximum, which may be insufficient for high-temperature applications. B180B-13-F and B280-13-F extend to 150°C, matching the main part's upper limit. Temperature range verification is critical for thermal design validation.

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