SK32-7-F Schottky Diode Equivalent & Substitute Parts

Part Overview

The SK32-7-F is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 20 V DC reverse voltage and 3 A average rectified current in a Surface Mount SMC (DO-214AB) package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Schottky diodes in this rating class are used in rectification, freewheeling, and protection circuits where fast recovery and low forward voltage drop are required. The SK32-7-F specifications establish the baseline parameters for identifying compatible alternatives across multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 20 V
Capacitance @ Vr, F	300	pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
Technology	Schottky	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SK32-7-F is determined by matching the following critical electrical and mechanical parameters:

Electrical Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 20 V minimum
Current - Average Rectified (Io): 3 A minimum
Voltage - Forward (Vf) (Max) @ If: 500 mV or lower at 3 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 500 µA or lower at 20 V

Mechanical Matching Criteria:

Package / Case: DO-214AB (SMC) or equivalent surface mount package
Mounting Type: Surface Mount
Technology: Schottky

Substitute parts are grouped into two categories:

Direct Manufacturer Substitutes: Parts with identical or superior electrical ratings and the same SMC package footprint, maintaining pin-for-pin compatibility.

Parametric Equivalents: Parts meeting all critical electrical parameters but potentially in alternative surface mount packages (SMA, SMB) or with minor variations in secondary parameters such as capacitance or reverse leakage current.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Temp Range	Product Status	RoHS Status
SK32-7-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	DO-214AB, SMC	-65°C ~ 150°C	Obsolete	ROHS3 Compliant
B320-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	DO-214AB, SMC	-55°C ~ 125°C	Active	ROHS3 Compliant
SS32	MDD	20 V	3 A	—	DO-214AC, SMA	-55°C ~ 125°C	Active	ROHS3 Compliant
5820SMJ/TR13	Microchip Technology	20 V	3 A	460 mV @ 3 A	DO-214AB	-55°C ~ 150°C	Active	RoHS non-compliant
5820SMJE3/TR13	Microchip Technology	20 V	3 A	460 mV @ 3 A	DO-214AB	-55°C ~ 150°C	Active	ROHS3 Compliant
SK32/TR13	Microsemi Corporation	—	—	—	SMCJ	—	Active	RoHS non-compliant
SK32B-TP	Micro Commercial Co	20 V	3 A	500 mV @ 3 A	DO-214AA, SMB	-55°C ~ 125°C	Obsolete	ROHS3 Compliant
CMSH3-20 TR13 PBFREE	Central Semiconductor Corp	20 V	3 A	500 mV @ 3 A	DO-214AB, SMC	-65°C ~ 150°C	Active	ROHS3 Compliant
MBRS320T3G	onsemi	20 V	3 A	500 mV @ 3 A	DO-214AB, SMC	-65°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Pin-for-Pin Replacement (DO-214AB SMC Package):

The B320-13-F (Diodes Incorporated) is the primary active substitute. It maintains identical electrical ratings, the same SMC package footprint, and ROHS3 compliance. The operating temperature range is reduced to -55°C ~ 125°C compared to the SK32-7-F range of -65°C ~ 150°C; this reduction is acceptable for most commercial and industrial applications.

The CMSH3-20 TR13 PBFREE (Central Semiconductor Corp) and MBRS320T3G (onsemi) are active alternatives with identical SMC packaging and electrical specifications. Both maintain the full -65°C ~ 150°C temperature range and ROHS3 compliance. These parts are suitable for applications requiring extended temperature operation.

For RoHS3 Compliance Requirement:

The 5820SMJE3/TR13 (Microchip Technology) is an active substitute with ROHS3 compliance and DO-214AB packaging. Forward voltage is reduced to 460 mV at 3 A, providing improved efficiency. Operating temperature range is -55°C ~ 150°C.

For Alternative Package Consideration:

The SS32 (MDD) in DO-214AC (SMA) package meets all electrical parameters but requires PCB layout modification due to different footprint. This option is suitable only when board redesign is feasible.

The SK32B-TP (Micro Commercial Co) in DO-214AA (SMB) package is obsolete and not recommended for new designs despite ROHS3 compliance.

For Non-Compliant Applications:

The 5820SMJ/TR13 (Microchip Technology) is an active part with RoHS non-compliant status. It is suitable only for applications where RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can the B320-13-F directly replace the SK32-7-F without PCB modification?

A: Yes. The B320-13-F maintains identical electrical specifications and the same DO-214AB SMC package footprint, enabling direct pin-for-pin replacement without PCB layout changes.

Q: What is the difference between the 5820SMJ/TR13 and 5820SMJE3/TR13?

A: Both parts are manufactured by Microchip Technology with identical electrical ratings and DO-214AB packaging. The primary difference is RoHS compliance: 5820SMJ/TR13 is RoHS non-compliant, while 5820SMJE3/TR13 is ROHS3 compliant. For new designs, the 5820SMJE3/TR13 is the appropriate selection.

Q: Why is the SS32 listed as a substitute if it uses a different package?

A: The SS32 meets all critical electrical parameters (20 V, 3 A, fast recovery Schottky) but uses the DO-214AC (SMA) package instead of DO-214AB (SMC). It is a parametric equivalent suitable only when PCB redesign is acceptable. The different footprint requires layout modification.

Q: Is the SK32B-TP a viable substitute despite being obsolete?

A: The SK32B-TP is not recommended for new designs. Although it is ROHS3 compliant and meets electrical specifications, its obsolete status and DO-214AA (SMB) package footprint make it unsuitable. The B320-13-F or CMSH3-20 TR13 PBFREE are preferred active alternatives.

Q: What is the significance of the -65°C ~ 150°C temperature range on the SK32-7-F compared to -55°C ~ 125°C on the B320-13-F?

A: The SK32-7-F supports extended temperature operation at both lower and upper limits. For applications operating within the -55°C ~ 125°C range, the B320-13-F is fully compatible. For applications requiring operation below -55°C or above 125°C, the CMSH3-20 TR13 PBFREE or MBRS320T3G are required to maintain the full temperature range.

Q: Are there any differences in reverse leakage current between the substitute parts?

A: Yes. The SK32-7-F, B320-13-F, CMSH3-20 TR13 PBFREE, and SK32B-TP specify 500 µA reverse leakage at 20 V. The MBRS320T3G specifies 2 mA, and the Microchip 5820 series specifies 1.5 mA. For applications sensitive to leakage current, the 500 µA specification parts are preferred.

Q: Can the CMSH3-20 TR13 PBFREE be used in high-temperature applications?

A: Yes. The CMSH3-20 TR13 PBFREE supports the full -65°C ~ 150°C operating range, matching the SK32-7-F temperature specification. It is suitable for applications requiring extended high-temperature operation.

Q: What does "PBFREE" in the CMSH3-20 TR13 PBFREE part number indicate?

A: "PBFREE" indicates lead-free construction, confirming RoHS compliance. This designation is part of the manufacturer's part numbering convention and does not affect electrical performance or substitution compatibility.

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