SK32A M2G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SK32A M2G is a 20V, 3A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in the DO-214AC (SMA) surface mount package. This component is classified as discontinued at DiGi Electronics, creating a requirement to identify equivalent and substitute parts for ongoing design support and procurement.

Schottky diodes in this voltage and current class are used in power supply circuits, reverse polarity protection, and high-frequency rectification applications where low forward voltage drop and fast switching characteristics are required. The discontinuation status necessitates identification of functionally compatible alternatives from active manufacturers.

Key Parameters

Parameter	SK32A M2G Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500 µA @ 20 V	µA
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Technology	Schottky	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SK32A M2G is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 20V minimum
Package / Case: DO-214AC (SMA) surface mount
Technology: Schottky
Mounting Type: Surface Mount
Current - Average Rectified (Io): 3A or greater

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max): Within typical Schottky diode range (500–550 mV @ rated current)
Speed: Fast Recovery ≤ 500ns or Standard Recovery > 500ns
Current - Reverse Leakage @ Vr: Typical range 200–1000 µA @ 20V
Operating Temperature - Junction: -55°C to -65°C minimum; 125°C to 150°C maximum
RoHS and MSL compliance: ROHS3 Compliant; MSL 1

Parametric Equivalent: The SK32A from SMC Diode Solutions matches all mandatory parameters with identical 20V, 3A ratings and DO-214AC packaging. This part is the direct parametric equivalent.

Similar Parts (Current-Limited Substitutes): Parts with 1A or 2A current ratings (B120 series, B220AQ-13-F) share the 20V reverse voltage and DO-214AC package but operate at reduced current capacity. These are suitable only for applications where the 3A requirement can be relaxed or where multiple devices are paralleled.

Voltage-Elevated Alternatives: The BYS10-25-E3/TR operates at 25V with 1.5A current, providing higher voltage margin but reduced current capacity. This part is suitable only for applications where voltage headroom is prioritized over current capacity.

Parameter Comparison

Parameter	SK32A M2G (Main)	SK32A (SMC)	B120-13-F	B120-E3/5AT	B120-E3/61T	B120-M3/5AT	B120-M3/61T	B120B-13-F	B120Q-13-F	B220AQ-13-F	BYS10-25-E3/TR
Voltage - DC Reverse (Vr) (Max)	20V	20V	20V	20V	20V	20V	20V	20V	20V	20V	25V
Current - Average Rectified (Io)	3A	3A	1A	1A	1A	1A	1A	1A	1A	2A	1.5A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 3A	550 mV @ 3A	500 mV @ 1A	520 mV @ 1A	520 mV @ 1A	520 mV @ 1A	520 mV @ 1A	500 mV @ 1A	500 mV @ 1A	500 mV @ 2A	500 mV @ 1A
Speed	Fast Recovery ≤ 500ns	Standard Recovery > 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns
Current - Reverse Leakage @ Vr	500 µA @ 20V	1 mA @ 20V	500 µA @ 20V	200 µA @ 20V	200 µA @ 20V	200 µA @ 20V	200 µA @ 20V	500 µA @ 20V	500 µA @ 20V	500 µA @ 20V	500 µA @ 25V
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AA, SMB	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 125°C	-65°C ~ 150°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

The SK32A from SMC Diode Solutions is the parametric equivalent to the SK32A M2G. It provides identical electrical specifications: 20V reverse voltage, 3A average rectified current, 550 mV forward voltage drop at 3A, and DO-214AC surface mount packaging. This part is active in production with high inventory availability (12,100 pieces). The only difference is recovery speed classification (Standard Recovery > 500ns versus Fast Recovery ≤ 500ns on the original), which does not affect functionality in most rectification applications. RoHS3 compliance and MSL 1 rating match the original specification.

Current-Limited Alternatives (1A Rated):

The B120 series from Diodes Incorporated and Vishay General Semiconductor (B120-13-F, B120-E3/5AT, B120-E3/61T, B120-M3/5AT, B120-M3/61T, B120Q-13-F) all operate at 20V reverse voltage with 1A average rectified current in DO-214AC SMA packaging. These parts are suitable only for applications where the circuit design permits operation at 1A or where current derating is acceptable. All variants are active with strong inventory availability. B120Q-13-F includes AEC-Q101 automotive qualification. Operating temperature ranges extend to -65°C minimum and 125–150°C maximum, providing wider temperature margins than the original part.

2A Intermediate Alternative:

The B220AQ-13-F from Diodes Incorporated provides 20V reverse voltage with 2A average rectified current in DO-214AC SMA packaging. This part bridges the gap between 1A and 3A ratings and is suitable for applications where 3A capacity is not required but 1A is insufficient. This part includes AEC-Q101 automotive qualification and operates across -65°C to 150°C. Inventory availability is high (20,100 pieces).

Voltage-Elevated Alternative (25V Rated):

The BYS10-25-E3/TR from Vishay General Semiconductor operates at 25V reverse voltage with 1.5A average rectified current in DO-214AC SMA packaging. This part is suitable only for applications where higher voltage margin is prioritized and current requirements can be met at 1.5A. This part is active with adequate inventory (12,800 pieces).

Package Variant (SMB):

The B120B-13-F from Diodes Incorporated provides 20V, 1A operation in DO-214AA SMB packaging instead of SMA. This part is suitable only if the circuit board layout accommodates the larger SMB footprint. SMB packages provide improved thermal performance for equivalent current ratings.

Compliance and Certification:

All recommended substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original specification. Parts designated with AEC-Q101 qualification (B120Q-13-F, B220AQ-13-F) are suitable for automotive applications requiring this certification.

Frequently Asked Questions (FAQ)

Q: Can the SK32A from SMC Diode Solutions be used as a direct replacement for the SK32A M2G?

A: Yes. The SK32A from SMC Diode Solutions is a parametric equivalent with identical 20V reverse voltage, 3A average rectified current, and DO-214AC SMA packaging. The only difference is recovery speed classification (Standard Recovery > 500ns versus Fast Recovery ≤ 500ns). This difference does not affect functionality in standard rectification applications. Both parts are ROHS3 compliant with MSL 1 rating.

Q: Why are the B120 series parts listed as substitutes if they are only rated for 1A instead of 3A?

A: The B120 series parts are listed as similar alternatives because they share the same 20V reverse voltage rating and DO-214AC SMA package. However, they are current-limited to 1A operation. These parts are suitable only for circuit designs that can operate at reduced current or where the 3A requirement can be relaxed. They are not direct replacements for 3A applications.

Q: What is the difference between the various B120 part numbers (B120-13-F, B120-E3/5AT, B120-E3/61T, B120-M3/5AT, B120-M3/61T)?

A: These part numbers represent the same electrical specifications (20V, 1A, DO-214AC SMA) but differ in packaging format and manufacturer. B120-13-F and B120Q-13-F are from Diodes Incorporated. B120-E3/5AT, B120-E3/61T, B120-M3/5AT, and B120-M3/61T are from Vishay General Semiconductor. The suffix designations indicate tape and reel (TR) or cut tape (CT) packaging formats. All are electrically equivalent at 20V, 1A operation.

Q: Can I use the B220AQ-13-F (2A rated) instead of the SK32A M2G (3A rated)?

A: The B220AQ-13-F is suitable only if your circuit design can operate at 2A or lower. It shares the same 20V reverse voltage and DO-214AC SMA package as the original part but is rated for 2A instead of 3A. If your application requires the full 3A capacity, this part is not suitable as a direct replacement.

Q: What is the difference between SMA and SMB packages?

A: SMA (DO-214AC) and SMB (DO-214AA) are both surface mount packages for Schottky diodes. SMB is physically larger than SMA and provides improved thermal performance. The B120B-13-F is available in SMB packaging. SMB packages are suitable only if your circuit board layout accommodates the larger footprint.

Q: Does the BYS10-25-E3/TR (25V rated) provide better performance than the SK32A M2G (20V rated)?

A: The BYS10-25-E3/TR provides higher reverse voltage margin (25V versus 20V) but operates at reduced current (1.5A versus 3A). This part is suitable only for applications where voltage headroom is prioritized and current requirements can be met at 1.5A or lower. It is not a direct replacement for 3A applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original SK32A M2G specification.

Q: Which substitute part has the widest operating temperature range?

A: Multiple parts share the widest operating temperature range of -65°C to 150°C: B120-13-F, B120-M3/5AT, B120-M3/61T, B120B-13-F, B120Q-13-F, B220AQ-13-F, and BYS10-25-E3/TR. The original SK32A M2G operates from -55°C to 150°C, providing a narrower low-temperature margin.

Q: Which substitute parts include automotive qualification?

A: The B120Q-13-F and B220AQ-13-F from Diodes Incorporated include AEC-Q101 automotive qualification. These parts are suitable for automotive applications requiring this certification.

Q: What is the inventory status of the recommended substitute parts?

A: The SK32A from SMC Diode Solutions has the highest inventory availability (12,100 pieces). The B120-E3/61T and B120Q-13-F also have strong availability (25,300 and 25,400 pieces respectively). All recommended substitute parts are active in production with adequate stock levels for procurement.

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