SK32-7 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SK32-7 is a 20V, 3A Schottky rectifier diode manufactured by Diodes Incorporated in Surface Mount SMC (DO-214AB) package. 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	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
Operating Temperature - Junction	-65°C ~ 150°C	°C
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the SK32-7 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 20 V
Current - Average Rectified (Io): 3 A
Voltage - Forward (Vf) (Max) @ If: 500 mV @ 3 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 500 µA @ 20 V
Technology: Schottky
Mounting Type: Surface Mount

Package Considerations: Substitutes are grouped into two categories based on package compatibility:

SMC Package (DO-214AB) Direct Substitutes: CMSH3-20 TR13 PBFREE and MBRS320T3G maintain identical package form factor, enabling direct PCB replacement without layout modification.
Alternative Package Substitutes: SK32B-TP (DO-214AA, SMB) and SS32 (DO-214AC, SMA) provide electrical equivalence but require PCB footprint adaptation due to different package geometries.

All substitute parts meet the core electrical specifications of the SK32-7 and operate within the required voltage, current, and temperature ranges.

Parameter Comparison

Parameter	SK32-7 (Diodes Inc)	CMSH3-20 TR13 PBFREE (Central Semi)	MBRS320T3G (onsemi)	SK32B-TP (Micro Commercial)	SS32 (MDD)
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	20 V	20 V	20 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	500 mV @ 3 A	500 mV @ 3 A	500 mV @ 3 A	Not specified
Speed	Fast Recovery ≤ 500ns, > 200mA	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	2 mA @ 20 V	500 µA @ 20 V	500 µA @ 20 V
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AA, SMB	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Technology	Schottky	Schottky	Schottky	Schottky	Schottky
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics	Active	Active	Obsolete	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

CMSH3-20 TR13 PBFREE and MBRS320T3G are the preferred substitutes for the SK32-7. Both parts maintain identical SMC (DO-214AB) package geometry, enabling direct PCB footprint compatibility without layout redesign. CMSH3-20 TR13 PBFREE is manufactured by Central Semiconductor Corp and carries ROHS3 compliance with active product status. MBRS320T3G is manufactured by onsemi with the largest available inventory (103,732 pcs) and active product status, providing superior supply chain availability. Both parts match all critical electrical parameters including 20V reverse voltage, 3A average rectified current, 500mV forward voltage drop at 3A, and fast recovery switching characteristics.

Secondary Substitutes (Alternative Package Options):

SK32B-TP (Micro Commercial Co) provides electrical equivalence in the DO-214AA (SMB) package, requiring PCB footprint modification. This part is ROHS3 compliant but classified as obsolete. SS32 (MDD) offers electrical equivalence in the DO-214AC (SMA) package with active product status and ROHS3 compliance, also requiring PCB layout adaptation.

Compliance Considerations:

The SK32-7 is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, meeting current regulatory requirements for new designs and production applications. All parts maintain REACH unaffected status and EAR99 export classification.

Temperature Range Consideration:

The SK32-7 operates across -65°C to 150°C junction temperature. CMSH3-20 TR13 PBFREE and MBRS320T3G maintain this extended temperature range. SK32B-TP and SS32 operate within -55°C to 125°C, representing a narrower operating window suitable for standard industrial applications but not for extended temperature range requirements.

Frequently Asked Questions (FAQ)

Q: Can MBRS320T3G be used as a direct replacement for SK32-7 without PCB modification?

A: Yes. MBRS320T3G is packaged in DO-214AB (SMC), identical to the SK32-7. The part matches all critical electrical specifications: 20V reverse voltage, 3A average rectified current, 500mV forward voltage drop at 3A, and fast recovery switching. Direct PCB footprint compatibility is maintained.

Q: What is the difference between CMSH3-20 TR13 PBFREE and MBRS320T3G?

A: Both parts are SMC package Schottky diodes with identical voltage and current ratings. The primary difference is reverse leakage current: CMSH3-20 TR13 PBFREE specifies 500µA at 20V, while MBRS320T3G specifies 2mA at 20V. For applications sensitive to leakage current, CMSH3-20 TR13 PBFREE is preferred. MBRS320T3G offers significantly higher inventory availability (103,732 pcs vs. 3,686 pcs).

Q: Why do SK32B-TP and SS32 require PCB modification?

A: SK32B-TP uses DO-214AA (SMB) package and SS32 uses DO-214AC (SMA) package. These packages have different physical dimensions and lead spacing compared to the SK32-7's DO-214AB (SMC) package. PCB footprints must be redesigned to accommodate the alternative package geometry.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant. The original SK32-7 is RoHS non-compliant. Substitution with any listed part upgrades the design to current RoHS compliance standards.

Q: Which substitute part has the best supply chain availability?

A: MBRS320T3G (onsemi) has the highest inventory level at 103,732 pcs new original in stock, providing superior supply chain security compared to other alternatives.

Q: Can SS32 be used in applications requiring the full -65°C to 150°C temperature range?

A: No. SS32 operates within -55°C to 125°C junction temperature range, which is narrower than the SK32-7's -65°C to 150°C range. For applications requiring extended low-temperature operation below -55°C or high-temperature operation above 125°C, CMSH3-20 TR13 PBFREE or MBRS320T3G must be selected.

Q: What is the significance of the "PBFREE" designation in CMSH3-20 TR13 PBFREE?

A: PBFREE indicates lead-free construction, confirming RoHS compliance. This part is suitable for applications and regions with strict lead-free material requirements.

Q: Is SK32B-TP a viable long-term substitute?

A: SK32B-TP is classified as obsolete, indicating discontinued production. While currently available in inventory (3,669 pcs), long-term supply cannot be assured. CMSH3-20 TR13 PBFREE or MBRS320T3G are preferred for new designs requiring sustained component availability.

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