SS22 M4G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS22 M4G is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 20 V DC reverse voltage and 2 A average rectified current in a DO-214AA (SMB) surface mount package. This device is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and maintenance applications. The part operates across a junction temperature range of -55°C to 125°C and complies with RoHS3 and REACH requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	20	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) Maximum @ If	500 mV @ 2 A	mV
Current - Reverse Leakage @ Vr	400	µA @ 20 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS22 M4G is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) Maximum: 20 V
Current - Average Rectified (Io): 2 A
Technology: Schottky
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Operating Temperature Range: Minimum -55°C to 125°C

Direct Parametric Equivalents maintain identical electrical specifications and package configuration, differing only in manufacturer, packaging format (tape & reel vs. cut tape), or product status.

Similar Substitutes share the same voltage and package specifications but may differ in current rating (1 A vs. 2 A), forward voltage characteristics, reverse leakage current, or operating temperature range. These parts are suitable only when the application does not require the full 2 A current rating or when thermal performance differences are acceptable.

Package Variants such as SMA (DO-214AC) differ in physical footprint and are not interchangeable without PCB redesign.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Package	Product Status	RoHS
SS22 M4G	Taiwan Semiconductor Corporation	20	2	500 @ 2A	400 @ 20V	DO-214AA, SMB	Discontinued at DiGi Electronics	ROHS3
SS22 R5G	Taiwan Semiconductor Corporation	20	2	500 @ 2A	400 @ 20V	DO-214AA, SMB	Discontinued at DiGi Electronics	ROHS3
SL22-E3/52T	Vishay General Semiconductor - Diodes Division	20	2	440 @ 2A	400 @ 20V	DO-214AA, SMB	Active	ROHS3
SL22-E3/5BT	Vishay General Semiconductor - Diodes Division	20	2	440 @ 2A	400 @ 20V	DO-214AA, SMB	Active	ROHS3
SL22-M3/52T	Vishay General Semiconductor - Diodes Division	20	2	440 @ 2A	400 @ 20V	DO-214AA, SMB	Active	ROHS3
B220-13-F	Diodes Incorporated	20	2	500 @ 2A	500 @ 20V	DO-214AA, SMB	Active	ROHS3
B220Q-13-F	Diodes Incorporated	20	2	500 @ 2A	500 @ 20V	DO-214AA, SMB	Active	ROHS3
5817SMJ/TR13	Microchip Technology	20	1	450 @ 1A	1000 @ 20V	DO-214AA, SMB	Active	RoHS non-compliant
CMSH1-20 BK PBFREE	Central Semiconductor Corp	20	1	550 @ 1A	500 @ 20V	DO-214AA, SMB	Active	ROHS3
SK12-LTP	Micro Commercial Co	20	1	500 @ 1A	500 @ 20V	DO-214AA, SMB	Not For New Designs	ROHS3
B220A-13-F	Diodes Incorporated	20	2	500 @ 2A	500 @ 20V	DO-214AC, SMA	Active	ROHS3

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents):

The following parts are direct replacements for the SS22 M4G with identical electrical specifications and DO-214AA SMB package:

SS22 R5G (Taiwan Semiconductor Corporation): Identical specifications, cut tape packaging, 883 pcs in stock. Suitable for immediate substitution.
SL22-E3/52T (Vishay General Semiconductor): Active product status, tape & reel packaging, 10,200 pcs in stock. Forward voltage 440 mV @ 2A (60 mV lower than SS22 M4G), indicating superior thermal performance. ROHS3 compliant.
SL22-E3/5BT (Vishay General Semiconductor): Active product status, tape & reel packaging, 1,045 pcs in stock. Identical electrical characteristics to SL22-E3/52T.
SL22-M3/52T (Vishay General Semiconductor): Active product status, tape & reel packaging, 945 pcs in stock. Identical electrical characteristics to SL22-E3/52T.

Recommended Primary Substitutes:

For new designs and ongoing production, SL22-E3/52T or SL22-E3/5BT are recommended. Both are manufactured by Vishay, carry active product status, maintain full 2 A current rating, and demonstrate improved forward voltage characteristics. Both are ROHS3 compliant with unlimited moisture sensitivity level.

Alternative Substitutes (Current-Reduced Applications):

The following parts are suitable only for applications where the 2 A current requirement can be reduced to 1 A:

CMSH1-20 BK PBFREE (Central Semiconductor Corp): 1 A rating, active status, ROHS3 compliant. Forward voltage 550 mV @ 1A.
5817SMJ/TR13 (Microchip Technology): 1 A rating, active status. Note: RoHS non-compliant; reverse leakage 1 mA @ 20V (2.5× higher than SS22 M4G).
SK12-LTP (Micro Commercial Co): 1 A rating, not for new designs status, ROHS3 compliant.

Package Variant (Not Recommended for Direct Substitution):

B220A-13-F (Diodes Incorporated): DO-214AC SMA package differs from DO-214AA SMB. Physical footprint incompatibility requires PCB redesign.

Full Current Rating Alternatives (2 A, DO-214AA SMB):

B220-13-F (Diodes Incorporated): 2 A rating, active status, ROHS3 compliant, 65,310 pcs in stock. Forward voltage 500 mV @ 2A (identical to SS22 M4G). Reverse leakage 500 µA @ 20V (100 µA higher than SS22 M4G).
B220Q-13-F (Diodes Incorporated): 2 A rating, active status, automotive grade with AEC-Q101 qualification, ROHS3 compliant, 3,868 pcs in stock. Identical electrical specifications to B220-13-F.

Frequently Asked Questions (FAQ)

Q: Can SS22 R5G be used as a direct replacement for SS22 M4G?

A: Yes. SS22 R5G is a parametric equivalent manufactured by the same supplier (Taiwan Semiconductor Corporation) with identical electrical specifications (20 V, 2 A, 500 mV forward voltage @ 2A, 400 µA reverse leakage @ 20V) and DO-214AA SMB package. The only difference is packaging format (cut tape vs. unspecified for M4G). Both are discontinued at DiGi Electronics.

Q: Why are Vishay SL22 series parts recommended over the original SS22 M4G?

A: Vishay SL22-E3/52T, SL22-E3/5BT, and SL22-M3/52T maintain identical voltage and current ratings with the same DO-214AA SMB package. The critical advantage is active product status, ensuring long-term availability. Additionally, forward voltage is 440 mV @ 2A (versus 500 mV for SS22 M4G), indicating lower power dissipation and improved thermal efficiency. All are ROHS3 compliant.

Q: Can 1 A rated diodes substitute for the 2 A SS22 M4G?

A: Substitution is possible only if the application circuit does not require the full 2 A current capacity. Parts such as CMSH1-20 BK PBFREE, 5817SMJ/TR13, and SK12-LTP are electrically compatible at 20 V reverse voltage and DO-214AA SMB package but are rated for 1 A maximum. Using a 1 A part in a 2 A application will result in thermal stress and potential device failure.

Q: What is the difference between B220-13-F and B220Q-13-F?

A: Both are manufactured by Diodes Incorporated with identical electrical specifications (20 V, 2 A, 500 mV forward voltage @ 2A, DO-214AA SMB package). B220Q-13-F carries automotive grade qualification (AEC-Q101) and is suitable for automotive applications. B220-13-F is the standard industrial version. Both are active products and ROHS3 compliant.

Q: Why is B220A-13-F not recommended as a substitute?

A: B220A-13-F uses a DO-214AC SMA package, which differs physically from the DO-214AA SMB package of the SS22 M4G. The two packages are not interchangeable without PCB redesign. While electrical specifications are equivalent (20 V, 2 A), the footprint incompatibility makes this unsuitable for direct substitution.

Q: Is the 5817SMJ/TR13 a suitable substitute?

A: The 5817SMJ/TR13 is not recommended as a primary substitute. Although it maintains 20 V reverse voltage and DO-214AA SMB package, it is rated for only 1 A (versus 2 A for SS22 M4G). Additionally, reverse leakage current is 1 mA @ 20V, which is 2.5 times higher than the SS22 M4G specification of 400 µA. The part is also RoHS non-compliant, whereas SS22 M4G is ROHS3 compliant.

Q: What is the significance of forward voltage differences between substitutes?

A: Forward voltage (Vf) directly affects power dissipation in the diode. Lower forward voltage results in lower heat generation. For example, SL22-E3/52T at 440 mV @ 2A dissipates less power than SS22 M4G at 500 mV @ 2A. In high-current or thermally constrained applications, lower forward voltage improves reliability and reduces cooling requirements.

Q: Are all recommended substitutes RoHS3 compliant?

A: All recommended direct replacements (SS22 R5G, SL22-E3/52T, SL22-E3/5BT, SL22-M3/52T, B220-13-F, B220Q-13-F) are ROHS3 compliant. The exception is 5817SMJ/TR13, which is RoHS non-compliant and should not be used in applications requiring RoHS compliance.

Q: What is the operating temperature range difference between substitutes?

A: The SS22 M4G operates from -55°C to 125°C junction temperature. Most Vishay and Diodes Incorporated substitutes extend the upper limit to 150°C, providing improved thermal margin. Central Semiconductor CMSH1-20 BK PBFREE also operates to 150°C. Microchip 5817SMJ/TR13 extends to 150°C. These extended ranges provide additional design flexibility in high-temperature environments.

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