Equivalent & Substitute Parts for SS22 Schottky Diode

Part Overview

The SS22 is an obsolete Schottky rectifier diode manufactured by onsemi, rated for 20V DC reverse voltage and 2A average rectified current in a DO-214AA (SMB) surface mount package. The part operates across a junction temperature range of -65°C to 125°C and exhibits fast recovery characteristics with a maximum forward voltage of 500 mV at 2A. Due to its obsolete product status, equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

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 ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	400	µA @ 20 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS22 is determined by strict electrical and mechanical compatibility criteria. All substitute parts must meet or exceed the following parameters:

Critical Substitution Parameters:

Voltage - DC Reverse (Vr) (Max): minimum 20V
Current - Average Rectified (Io): minimum 2A
Package / Case: DO-214AA, SMB (surface mount)
Technology: Schottky
Mounting Type: Surface Mount
Forward Voltage (Vf): compatible at rated current
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (20V, 2A) Parts with identical voltage and current ratings that provide direct functional replacement without circuit modification.

Category 2: Higher Current Rated Substitutes (20V, ≥2A) Parts with equal or higher current ratings that operate within the same voltage class. These parts are electrically compatible for applications where the SS22 is specified, as they provide equal or superior current handling capability.

Parts with lower current ratings (1A) or higher voltage ratings (25V) are listed for reference but require circuit evaluation before substitution.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Product Status	Temp Range (Tj)
SS22	onsemi	20V	2A	500 mV @ 2A	400 µA @ 20V	DO-214AA, SMB	Obsolete	-65 to 125°C
SS22T3G	onsemi	20V	2A	500 mV @ 2A	400 µA @ 40V	DO-214AA, SMB	Last Time Buy	-55 to 150°C
B220-13-F	Diodes Incorporated	20V	2A	500 mV @ 2A	500 µA @ 20V	DO-214AA, SMB	Active	-65 to 150°C
B220Q-13-F	Diodes Incorporated	20V	2A	500 mV @ 2A	500 µA @ 20V	DO-214AA, SMB	Active	-65 to 150°C
SK22_R1_00001	Panjit International Inc.	20V	2A	500 mV @ 2A	90 µA @ 20V	DO-214AA, SMB	Active	-55 to 150°C
B320B-13-F	Diodes Incorporated	20V	3A	500 mV @ 3A	500 µA @ 20V	DO-214AA, SMB	Active	-55 to 150°C
SK32B-LTP	Micro Commercial Co	20V	3A	500 mV @ 3A	500 µA @ 20V	DO-214AA, SMB	Not For New Designs	-55 to 150°C
SK42BL-TP	Micro Commercial Co	20V	4A	450 mV @ 4A	500 µA @ 20V	DO-214AA, SMB	Not For New Designs	-55 to 150°C
STPS2L25U	STMicroelectronics	25V	2A	450 mV @ 2A	90 µA @ 25V	DO-214AA, SMB	Active	—
B120B-13-F	Diodes Incorporated	20V	1A	500 mV @ 1A	500 µA @ 20V	DO-214AA, SMB	Active	-65 to 150°C

Engineering Selection Recommendations

Recommended Direct Substitutes (20V, 2A Rating):

B220-13-F (Diodes Incorporated) — Active product status with extended temperature range (-65 to 150°C). Identical electrical specifications to SS22. Available in Cut Tape and Digi-Reel packaging with high inventory (65,310 pcs). ROHS3 compliant.
B220Q-13-F (Diodes Incorporated) — Active product with AEC-Q101 automotive qualification. Identical 20V/2A rating. Suitable for automotive and high-reliability applications. ROHS3 compliant.
SK22_R1_00001 (Panjit International Inc.) — Active product with superior reverse leakage characteristics (90 µA @ 20V vs. 400 µA @ 20V). Extended temperature range (-55 to 150°C). ROHS3 compliant.
SS22T3G (onsemi) — Last Time Buy status from original manufacturer. Maintains onsemi design continuity with extended temperature range (-55 to 150°C). ROHS3 compliant.

Higher Current Rated Alternatives (20V, ≥3A):

B320B-13-F (Diodes Incorporated) — 3A rating provides current margin above SS22 specification. Active product with AEC-Q101 automotive qualification. Extended temperature range (-55 to 150°C). ROHS3 compliant.

Not Recommended for New Designs:

SK32B-LTP and SK42BL-TP (Micro Commercial Co) — Both marked "Not For New Designs" despite meeting electrical specifications.

Reference Only (Voltage Mismatch):

STPS2L25U (STMicroelectronics) — 25V rating exceeds SS22 specification. Suitable only for applications requiring higher voltage margin.
B120B-13-F and B120BQ-13-F (Diodes Incorporated) — 1A rating is below SS22 specification. Not suitable for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can B220-13-F directly replace SS22 in existing designs?

A: Yes. B220-13-F meets all electrical and mechanical requirements of SS22. Both are rated 20V/2A Schottky diodes in DO-214AA (SMB) packages with identical forward voltage characteristics. B220-13-F is an active product with extended temperature range and higher inventory availability.

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

A: Both parts are electrically identical 20V/2A Schottky diodes. B220Q-13-F carries AEC-Q101 automotive qualification, making it suitable for automotive and high-reliability applications. B220-13-F is the standard industrial grade. Selection depends on application requirements.

Q: Why is STPS2L25U listed if it has a different voltage rating?

A: STPS2L25U is rated 25V/2A, which exceeds the SS22 specification of 20V/2A. While electrically compatible in circuits designed for 20V operation, the higher voltage rating is not required for direct substitution. It is listed for reference in applications where additional voltage margin is beneficial.

Q: Can I use B320B-13-F (3A) instead of SS22 (2A)?

A: Yes. B320B-13-F is electrically compatible and provides superior current handling capability. The 3A rating exceeds the 2A requirement of SS22, making it suitable for direct substitution without circuit modification. This part is active and carries AEC-Q101 automotive qualification.

Q: What does "Last Time Buy" status mean for SS22T3G?

A: Last Time Buy indicates that onsemi will accept orders for a limited time before discontinuing the part. SS22T3G is functionally equivalent to SS22 but with extended temperature range. It is suitable for immediate substitution but should not be selected for new long-term production due to eventual unavailability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts listed carry ROHS3 compliance certification, matching the environmental compliance of the original SS22.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current affects power dissipation and circuit performance at high temperatures. SK22_R1_00001 exhibits lower reverse leakage (90 µA @ 20V) compared to SS22 (400 µA @ 20V), resulting in reduced standby power consumption. This is beneficial in low-power applications but not critical for most general-purpose rectification circuits.

Q: Can I use B120B-13-F (1A) if my circuit only draws 1A?

A: No. B120B-13-F is rated for 1A average rectified current, which matches the circuit requirement but does not provide the 2A capability of SS22. If the original design specified SS22, the circuit may require 2A capability for transient conditions or future design margin. Direct substitution with a lower-rated part is not recommended without circuit analysis.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and bulk quantities. All maintain the DO-214AA (SMB) surface mount package footprint. Packaging selection depends on production volume and assembly requirements.

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