SS22T3 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS22T3 is a 20V, 2A Schottky rectifier diode manufactured by onsemi in DO-214AA (SMB) surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. The SS22T3 serves as a fast recovery rectifier suitable for low-voltage power supply applications, voltage clamping, and reverse polarity protection circuits. Identification of compatible alternatives ensures design flexibility and supply chain resilience.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the SS22T3 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage rating: 20V DC reverse voltage (Vr) minimum
Current rating: 2A average rectified current (Io)
Forward voltage: 500 mV maximum at 2A
Package: DO-214AA (SMB) surface mount
Technology: Schottky diode
Speed: Fast recovery ≤ 500ns

Substitution Categories:

Direct Equivalents maintain all electrical and mechanical parameters within specified tolerances. These parts are pin-compatible and functionally interchangeable without circuit modification.

Functional Equivalents meet or exceed the primary electrical specifications (voltage, current, forward voltage, speed) while maintaining the same package and mounting type. Minor variations in reverse leakage current or temperature range do not preclude substitution when the application requirements are satisfied.

Current-Rated Alternatives provide higher current capacity (3A) in the same package. These are suitable for applications where the SS22T3's 2A rating is marginal or where design margin is required. Lower current alternatives (1A) are not suitable for direct substitution.

Compliance Variants include RoHS3-compliant versions of equivalent parts, necessary for applications subject to environmental regulations.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Reverse Leakage @ Vr	Package	Temp Range	Product Status	RoHS Status
SS22T3	onsemi	20 V	2 A	500 mV @ 2 A	400 µA @ 40 V	DO-214AA, SMB	-55°C ~ 150°C	Obsolete	RoHS non-compliant
SS22T3G	onsemi	20 V	2 A	500 mV @ 2 A	400 µA @ 40 V	DO-214AA, SMB	-55°C ~ 150°C	Last Time Buy	ROHS3 Compliant
SS22-E3/52T	Vishay General Semiconductor - Diodes Division	20 V	2 A	500 mV @ 2 A	400 µA @ 20 V	DO-214AA, SMB	-65°C ~ 125°C	Active	ROHS3 Compliant
SS22/1	Vishay General Semiconductor - Diodes Division	20 V	2 A	500 mV @ 2 A	400 µA @ 20 V	DO-214AA, SMB	-65°C ~ 125°C	Active	RoHS non-compliant
B220Q-13-F	Diodes Incorporated	20 V	2 A	500 mV @ 2 A	500 µA @ 20 V	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
B220-13-F	Diodes Incorporated	20 V	2 A	500 mV @ 2 A	500 µA @ 20 V	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SL22-E3/52T	Vishay General Semiconductor - Diodes Division	20 V	2 A	440 mV @ 2 A	400 µA @ 20 V	DO-214AA, SMB	-55°C ~ 125°C	Active	ROHS3 Compliant
B320B-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	500 µA @ 20 V	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SK32B-LTP	Micro Commercial Co	20 V	3 A	500 mV @ 3 A	500 µA @ 20 V	DO-214AA, SMB	-55°C ~ 150°C	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Preferred):

SS22T3G is the primary direct equivalent. It maintains identical electrical specifications (20V, 2A, 500mV forward voltage) and package configuration while offering ROHS3 compliance and Last Time Buy status. This part is recommended for immediate substitution in existing designs.

SS22-E3/52T (Vishay) and SS22/1 (Vishay) are functionally equivalent alternatives. Both maintain the 20V/2A rating and 500mV forward voltage specification. SS22-E3/52T is active and ROHS3 compliant, making it suitable for new designs. SS22/1 is active but RoHS non-compliant. The Vishay parts feature a lower reverse leakage specification (400µA @ 20V vs. 400µA @ 40V for the original), which is advantageous in low-leakage applications.

Compliant Alternatives:

B220-13-F and B220Q-13-F (Diodes Incorporated) meet all primary electrical requirements with 20V/2A ratings and 500mV forward voltage. Both are ROHS3 compliant and active. B220Q-13-F includes AEC-Q101 automotive qualification. These parts feature slightly higher reverse leakage (500µA @ 20V) but operate across an extended temperature range (-65°C to 150°C), providing additional thermal margin.

SL22-E3/52T (Vishay) is an active, ROHS3-compliant alternative with superior forward voltage performance (440mV @ 2A vs. 500mV). This lower forward voltage reduces power dissipation in rectification applications. Temperature range is -55°C to 125°C.

Higher Current Alternatives:

B320B-13-F (Diodes Incorporated) and SK32B-LTP (Micro Commercial Co) provide 3A current capacity in the same DO-214AA package. These are suitable for applications where the 2A rating is insufficient or where design margin is required. B320B-13-F is active and AEC-Q101 qualified. SK32B-LTP is marked Not For New Designs but remains available. Both maintain 20V voltage rating and 500mV forward voltage specification.

Compliance Considerations:

For applications requiring RoHS3 compliance, select from: SS22T3G, SS22-E3/52T, B220Q-13-F, B220-13-F, SL22-E3/52T, B320B-13-F, or SK32B-LTP.

For applications requiring automotive qualification (AEC-Q101), select: B220Q-13-F or B320B-13-F.

For new designs, prioritize active status parts: SS22-E3/52T, SS22/1, B220Q-13-F, B220-13-F, SL22-E3/52T, or B320B-13-F.

Frequently Asked Questions (FAQ)

Q: Can SS22T3G be used as a direct replacement for SS22T3?

A: Yes. SS22T3G is a direct equivalent with identical electrical specifications (20V, 2A, 500mV forward voltage) and DO-214AA package. The primary difference is ROHS3 compliance and Last Time Buy status. No circuit modification is required.

Q: What is the difference between SS22T3 and B220-13-F?

A: Both are 20V, 2A Schottky diodes in DO-214AA package with 500mV forward voltage. The B220-13-F has slightly higher reverse leakage (500µA @ 20V vs. 400µA @ 40V) and extended temperature range (-65°C to 150°C vs. -55°C to 150°C). B220-13-F is active and ROHS3 compliant, while SS22T3 is obsolete and RoHS non-compliant.

Q: Can I use B320B-13-F (3A) instead of SS22T3 (2A)?

A: Yes, for applications where higher current capacity is acceptable. B320B-13-F maintains the same 20V voltage rating and 500mV forward voltage specification. The 3A rating provides additional design margin. This substitution is suitable when the application does not require current limiting to 2A.

Q: What is the advantage of SL22-E3/52T over SS22T3?

A: SL22-E3/52T offers lower forward voltage (440mV @ 2A vs. 500mV @ 2A), reducing power dissipation by approximately 12% in rectification applications. It is active, ROHS3 compliant, and maintains the same 20V/2A electrical rating and DO-214AA package. Temperature range is -55°C to 125°C.

Q: Are all substitute parts pin-compatible with SS22T3?

A: Yes. All listed substitute parts use the DO-214AA (SMB) package with identical pinout. No PCB modification is required for mechanical or electrical connection.

Q: Which substitute part is recommended for automotive applications?

A: B220Q-13-F or B320B-13-F are recommended for automotive applications. Both carry AEC-Q101 qualification, indicating compliance with automotive reliability standards. B220Q-13-F maintains the 2A rating, while B320B-13-F provides 3A capacity.

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

A: Cut Tape and Tape & Reel are supply formats, not electrical specifications. Both contain identical components. Tape & Reel is suitable for automated assembly; Cut Tape is suitable for manual or small-volume assembly. Electrical performance is identical.

Q: Is SS22/1 suitable for new designs?

A: SS22/1 is active and functionally equivalent to SS22T3, but it is RoHS non-compliant. For new designs subject to environmental regulations, select ROHS3-compliant alternatives such as SS22-E3/52T, B220-13-F, or SL22-E3/52T.

Q: Why is SK32B-LTP marked "Not For New Designs"?

A: SK32B-LTP is available for legacy system support but is not recommended for new product development. For new designs requiring 3A capacity, use B320B-13-F, which is active and ROHS3 compliant.

Q: Can I use a 1A diode (B120B-13-F) as a substitute for SS22T3 (2A)?

A: No. B120B-13-F is rated for 1A average rectified current, which is insufficient for applications requiring 2A. This substitution would result in component overstress and potential failure.

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