SK38 Schottky Rectifier Diode Equivalent & Substitute Parts

Part Overview

The SK38 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 SMC (DO-214AB) package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The SK38 operates across a junction temperature range of -55°C to 150°C and exhibits fast recovery characteristics suitable for high-frequency rectification applications.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the SK38 Schottky rectifier diode is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 80 V minimum
Current - Average Rectified (Io): 3 A minimum
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 500 µA @ 80 V maximum
Operating Temperature - Junction: -55°C minimum to 125°C or higher

Package Compatibility Considerations:

Direct package equivalents: DO-214AB, SMC (identical footprint and thermal characteristics)
Alternative packages: DO-214AA (SMB), DO-214AC (SMA) require PCB layout modification but maintain electrical compatibility

Substitute parts are grouped into three categories:

Direct Equivalents (Same Package - DO-214AB/SMC): Parts with identical electrical ratings, package, and mounting footprint
Package Variants (Alternative Surface Mount Packages): Parts with equivalent electrical ratings but different package geometries
Parametric Equivalents (Voltage Derating): Parts with lower voltage ratings suitable for applications not requiring full 80 V capability

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 3A [mV]	Package	Temp Range [°C]	Product Status	RoHS Status
SK38	Micro Commercial Co	80	3	850	DO-214AB, SMC	-55 to 150	Obsolete	Non-compliant
SK38-TP	Micro Commercial Co	80	3	850	DO-214AB, SMC	-55 to 150	Not For New Designs	ROHS3 Compliant
B380-13-F	Diodes Incorporated	80	3	790	DO-214AB, SMC	-55 to 125	Active	ROHS3 Compliant
B380Q-13-F	Diodes Incorporated	80	3	790	DO-214AB, SMC	-55 to 125	Active	ROHS3 Compliant
B380B-13-F	Diodes Incorporated	80	3	790	DO-214AA, SMB	-55 to 150	Active	ROHS3 Compliant
B370-13-F	Diodes Incorporated	70	3	790	DO-214AB, SMC	-55 to 125	Active	ROHS3 Compliant
SK38/TR13	Microsemi Corporation	80	3	850	DO-214AB, SMC	-55 to 125	Active	Non-compliant
SK38E3/TR13	Microsemi Corporation	80	3	850	DO-214AB, SMC	-55 to 125	Active	ROHS3 Compliant
SS38	MDD	80	3	—	DO-214AC, SMA	-55 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Same Package, Same Footprint):

The B380-13-F (Diodes Incorporated) is the primary recommended substitute for the obsolete SK38. This part maintains identical electrical ratings (80 V, 3 A), uses the same DO-214AB/SMC package, and carries Active product status with ROHS3 compliance. The forward voltage is 60 mV lower (790 mV vs. 850 mV), resulting in improved efficiency and reduced thermal dissipation.

The SK38E3/TR13 (Microsemi Corporation) provides an alternative direct replacement with identical electrical characteristics and ROHS3 compliance. This part maintains the original forward voltage specification (850 mV) and supports the full -55°C to 150°C temperature range of the original SK38.

For RoHS3 Compliance Requirement:

If RoHS3 compliance is mandatory, the SK38-TP (Micro Commercial Co) provides a direct electrical and package equivalent with ROHS3 certification. However, this part is classified as "Not For New Designs," limiting its suitability for new product development.

For Automotive Applications:

The B380Q-13-F (Diodes Incorporated) is qualified to AEC-Q101 automotive standards and provides identical electrical ratings with ROHS3 compliance. This part is suitable for automotive-grade applications requiring formal qualification documentation.

For Alternative Package Geometries:

The B380B-13-F (Diodes Incorporated) offers equivalent electrical performance in the DO-214AA/SMB package. This larger package provides improved thermal dissipation and mechanical robustness but requires PCB layout modification.

The SS38 (MDD) provides parametric equivalence in the DO-214AC/SMA package with extended temperature range (-55°C to 150°C). This smaller package is suitable for space-constrained applications.

For Voltage Derating Applications:

The B370-13-F (Diodes Incorporated) is suitable for applications where 70 V reverse voltage rating is sufficient. This part maintains 3 A current rating and identical package geometry with improved forward voltage characteristics (790 mV).

Frequently Asked Questions (FAQ)

Q: Can the B380-13-F directly replace the SK38 without PCB modification?

A: Yes. The B380-13-F uses the identical DO-214AB/SMC package and maintains the same electrical ratings (80 V, 3 A). No PCB layout changes are required. The 60 mV reduction in forward voltage (790 mV vs. 850 mV) improves efficiency without affecting circuit compatibility.

Q: What is the difference between SK38-TP and SK38?

A: The SK38-TP is the Tape & Reel packaged variant of the SK38 with ROHS3 compliance. Electrical specifications are identical. The primary difference is packaging format and compliance status. SK38-TP is classified as "Not For New Designs," indicating it is maintained for legacy support only.

Q: Is the B380B-13-F (SMB package) compatible with SK38 (SMC package) designs?

A: The B380B-13-F maintains identical electrical ratings but uses the larger DO-214AA/SMB package. Direct PCB footprint substitution is not possible without layout modification. The SMB package provides superior thermal performance due to increased lead surface area. PCB redesign is required for this substitution.

Q: Can the B370-13-F (70 V rating) be used in place of the SK38 (80 V rating)?

A: The B370-13-F is suitable only for applications where the maximum reverse voltage does not exceed 70 V. If the circuit design requires the full 80 V rating margin, this part is not appropriate. Verify circuit operating conditions before selecting this lower-voltage alternative.

Q: What is the temperature range limitation of the B380-13-F compared to the SK38?

A: The B380-13-F operates from -55°C to 125°C, while the SK38 operates from -55°C to 150°C. If the application requires junction temperatures above 125°C, the B380-13-F is not suitable. The SK38E3/TR13 (Microsemi) maintains the full -55°C to 150°C range.

Q: Does the SS38 (SMA package) provide equivalent performance to the SK38 (SMC package)?

A: The SS38 maintains identical electrical ratings (80 V, 3 A) and supports the full -55°C to 150°C temperature range. However, the DO-214AC/SMA package is physically smaller than the DO-214AB/SMC package. PCB layout modification is required. The SS38 is suitable for space-constrained applications where thermal dissipation is not a limiting factor.

Q: Which substitute part offers the best RoHS3 compliance and Active product status?

A: The B380-13-F (Diodes Incorporated) combines Active product status, ROHS3 compliance, and identical electrical/package specifications. This part is the recommended primary substitute for new designs and production continuity.

Q: Is the SK38/TR13 (Microsemi) a suitable replacement for the obsolete SK38?

A: The SK38/TR13 provides identical electrical characteristics and package geometry. However, this part is RoHS non-compliant, matching the original SK38 compliance status. If RoHS3 compliance is required, the SK38E3/TR13 variant (same manufacturer) provides ROHS3 certification with identical electrical performance.

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