SS22T3G Equivalent & Substitute Parts

Part Overview

The SS22T3G is a Schottky rectifier diode manufactured by onsemi, rated for 20 V DC reverse voltage and 2 A average rectified current in a surface mount SMB package. This component is classified as Last Time Buy, indicating that onsemi has discontinued active production. The fast recovery characteristic (≤500 ns) and low forward voltage drop (500 mV @ 2 A) make this diode suitable for high-frequency switching and power conversion applications. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs and long-term support.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A	mV
Speed	Fast Recovery ≤500 ns, >200 mA (Io)	ns
Current - Reverse Leakage @ Vr	400 µA @ 40 V	µA
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS22T3G is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters for Direct Substitution:

Voltage - DC Reverse (Vr) (Max): 20 V minimum
Current - Average Rectified (Io): 2 A minimum
Voltage - Forward (Vf) (Max) @ If: 500 mV or lower @ 2 A
Speed: Fast Recovery ≤500 ns, >200 mA (Io)
Package / Case: DO-214AA, SMB (surface mount)
Technology: Schottky

Acceptable Variations:

Operating Temperature Range: May exceed the original -55°C ~ 150°C specification
Current - Reverse Leakage: May be equal to or lower than specified
Packaging Format: Cut Tape (CT), Tape & Reel (TR), or Bulk acceptable for equivalent function

Parts are grouped into two categories:

Direct Equivalents (Same Voltage & Current Rating): Parts with 20 V reverse voltage and 2 A current rating in SMB package.

Similar Substitutes (Higher Voltage or Current Rating): Parts with 40 V reverse voltage or 3 A+ current rating. These provide enhanced performance margins and are suitable for applications where the original 20 V / 2 A specification can accommodate higher ratings without design modification.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Package	Temp Range [°C]	Product Status
SS22T3G	onsemi	20	2	500 @ 2A	DO-214AA, SMB	-55 ~ 150	Last Time Buy
SS22-E3/52T	Vishay General Semiconductor - Diodes Division	20	2	500 @ 2A	DO-214AA, SMB	-65 ~ 125	Active
B220-13-F	Diodes Incorporated	20	2	500 @ 2A	DO-214AA, SMB	-65 ~ 150	Active
B240-13-F	Diodes Incorporated	40	2	500 @ 2A	DO-214AA, SMB	-65 ~ 150	Active
B240A-13-F	Diodes Incorporated	40	2	500 @ 2A	DO-214AC, SMA	-65 ~ 150	Active
B240Q-13-F	Diodes Incorporated	40	2	500 @ 2A	DO-214AA, SMB	-65 ~ 150	Active
CMSH1-40 TR13 PBFREE	Central Semiconductor Corp	40	1	500 @ 1A	DO-214AC, SMA	-65 ~ 150	Active
CMSH3-40M BK PBFREE	Central Semiconductor Corp	40	3	550 @ 3A	DO-214AA, SMB	-65 ~ 150	Active
CMSH3-40M TR13 PBFREE	Central Semiconductor Corp	40	3	550 @ 3A	DO-214AA, SMB	-65 ~ 150	Active
SK32B-LTP	Micro Commercial Co	20	3	500 @ 3A	DO-214AA, SMB	-55 ~ 150	Not For New Designs
SK42BL-TP	Micro Commercial Co	20	4	450 @ 4A	DO-214AA, SMB	-55 ~ 150	Not For New Designs

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Recommended for Pin-Compatible Replacement):

The SS22-E3/52T (Vishay General Semiconductor - Diodes Division) and B220-13-F (Diodes Incorporated) are direct electrical and mechanical equivalents to the SS22T3G. Both parts maintain the 20 V / 2 A specification, SMB package format, and fast recovery characteristics. Both manufacturers are Active status, ensuring long-term availability. The SS22-E3/52T is supplied in Cut Tape format, while B220-13-F is available in Cut Tape and Digi-Reel formats. Selection between these two should be based on packaging preference and supply chain availability.

Tier 2 - Higher Voltage Rating (40 V) with Same Current (2 A):

The B240-13-F and B240Q-13-F (Diodes Incorporated) provide 40 V reverse voltage rating while maintaining 2 A current capacity and SMB package compatibility. These parts are suitable for applications where voltage margin enhancement is acceptable without circuit redesign. The B240Q-13-F includes AEC-Q101 automotive qualification and is supplied in Tape & Reel format. The B240-13-F is available in Cut Tape and Digi-Reel formats. Both are Active status.

Tier 3 - Higher Current Rating (3 A) with Same Voltage (20 V):

The SK32B-LTP (Micro Commercial Co) provides 3 A current capacity at 20 V reverse voltage in SMB package. This part is classified as Not For New Designs, limiting its suitability for new production applications despite electrical compatibility.

Tier 4 - Higher Voltage and Current Ratings (40 V / 3 A):

The CMSH3-40M BK PBFREE and CMSH3-40M TR13 PBFREE (Central Semiconductor Corp) provide enhanced performance with 40 V reverse voltage and 3 A current capacity. These parts are Active status and available in Bulk and Tape & Reel formats respectively. Forward voltage is specified at 550 mV @ 3 A, representing a 50 mV increase compared to the original specification at 2 A. These parts are suitable for applications requiring performance margin beyond the original 20 V / 2 A specification.

Package Consideration:

The B240A-13-F uses DO-214AC (SMA) package instead of DO-214AA (SMB). This represents a different footprint and is not recommended for direct board-level substitution without PCB layout modification.

Compliance Status:

All recommended parts maintain ROHS3 compliance and REACH Unaffected status, consistent with the original SS22T3G specification.

Frequently Asked Questions (FAQ)

Q: Can I use the B240-13-F (40 V rating) as a direct replacement for the SS22T3G (20 V rating)?

A: Yes. The B240-13-F maintains the same 2 A current rating, SMB package, and fast recovery characteristics. The higher 40 V reverse voltage rating provides additional voltage margin and does not create incompatibility in applications designed for 20 V operation. The part is electrically and mechanically compatible.

Q: What is the difference between SS22-E3/52T and B220-13-F?

A: Both are direct electrical equivalents with 20 V / 2 A ratings in SMB package. The primary differences are manufacturer (Vishay vs. Diodes Incorporated) and packaging format (Cut Tape vs. Cut Tape & Digi-Reel). Electrical performance and compliance are equivalent.

Q: Why is the B240A-13-F not recommended as a direct substitute?

A: The B240A-13-F uses DO-214AC (SMA) package instead of DO-214AA (SMB). This represents a different physical footprint and pin layout, requiring PCB modification for installation. It is not suitable for direct board-level substitution.

Q: Can I use CMSH3-40M parts (3 A rating) instead of the SS22T3G (2 A rating)?

A: Yes, for applications where the circuit can accommodate higher current capacity. The CMSH3-40M provides 40 V reverse voltage and 3 A current rating, both exceeding the original specification. Forward voltage is 550 mV @ 3 A compared to 500 mV @ 2 A on the original part. These parts are suitable for designs requiring enhanced performance margins.

Q: What does "Not For New Designs" status mean for SK32B-LTP and SK42BL-TP?

A: Parts marked "Not For New Designs" indicate that the manufacturer has discontinued active development and support. While these parts may be electrically compatible, they are not recommended for new production applications due to uncertain long-term availability and potential supply discontinuation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed in this reference maintain ROHS3 compliance and REACH Unaffected status, consistent with the original SS22T3G specification.

Q: What is the difference between Cut Tape (CT), Tape & Reel (TR), and Bulk packaging?

A: Cut Tape is supplied in individual strips suitable for manual or semi-automated assembly. Tape & Reel is supplied on continuous reels for automated pick-and-place equipment. Bulk is supplied in loose quantities. Selection depends on manufacturing process and volume requirements. Electrical performance is identical across all packaging formats.

Q: Can I substitute the SS22T3G with a part rated for lower voltage, such as a 10 V diode?

A: No. Substitution with lower voltage ratings is not acceptable. The reverse voltage rating must equal or exceed the original 20 V specification to maintain circuit safety and performance margins.

Q: What is the significance of the fast recovery specification (≤500 ns)?

A: Fast recovery indicates the diode's ability to switch off quickly when reverse bias is applied. This characteristic is critical for high-frequency switching applications and power conversion circuits. All substitute parts listed maintain this specification, ensuring functional compatibility in switching applications.

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