Equivalent & Substitute Parts for SS22/1 Schottky Diode

Part Overview

The SS22/1 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 20 V DC reverse voltage and 2 A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as Active and operates across a junction temperature range of -65°C to 125°C.

Equivalent and substitute parts are necessary when the original SS22/1 becomes unavailable, when alternative compliance certifications are required, or when design specifications permit operation within expanded electrical parameters. The substitute parts listed maintain the core electrical specifications while offering variations in reverse leakage current, forward voltage characteristics, temperature range, and regulatory compliance status.

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	—

Substitute Part Grouping Explanation

Substitution eligibility for the SS22/1 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 20 V
Current - Average Rectified (Io): Must equal or exceed 2 A
Package / Case: Must be DO-214AA or SMB compatible
Mounting Type: Must be Surface Mount
Technology: Must be Schottky

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Acceptable range 430 mV to 500 mV at rated current
Speed: Must maintain Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature - Junction: Minimum -55°C to maximum 125°C or higher
Current - Reverse Leakage @ Vr: Acceptable range 20 µA to 500 µA at rated voltage

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (20 V, 2 A): Parts maintaining identical voltage and current ratings with equivalent or superior electrical characteristics. These include B220-13-F, SK22_R1_00001, and SS22T3G.

Category B - Upgraded Substitutes (20 V, 3 A or 40 V, 2 A): Parts with enhanced current capacity or voltage rating that operate within the same package footprint. These include SK32B-LTP and STPS2L40U. These parts are suitable for applications where the original specification permits operation at higher ratings.

Parameter Comparison

Parameter	SS22/1 (Vishay)	B220-13-F (Diodes Inc.)	SK22_R1_00001 (Panjit)	SS22T3G (onsemi)	SK32B-LTP (MCC)	STPS2L40U (STMicro)
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	20 V	20 V	20 V	40 V
Current - Average Rectified (Io)	2 A	2 A	2 A	2 A	3 A	2 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A	500 mV @ 2 A	500 mV @ 2 A	500 mV @ 2 A	500 mV @ 3 A	430 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	400 µA @ 20 V	500 µA @ 20 V	90 µA @ 20 V	400 µA @ 40 V	500 µA @ 20 V	220 µA @ 40 V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-65 to 125°C	-65 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	Max 150°C
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Last Time Buy	Not For New Designs	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Specifications):

B220-13-F (Diodes Incorporated) is the primary recommended substitute. This part maintains 20 V reverse voltage and 2 A current ratings with identical forward voltage characteristics. B220-13-F offers ROHS3 compliance and an extended operating temperature range to 150°C, addressing regulatory requirements that may exceed the original SS22/1 specification. Product status is Active with high inventory availability (65,310 units).

SK22_R1_00001 (Panjit International Inc.) provides an alternative direct equivalent with superior reverse leakage characteristics (90 µA versus 400 µA at 20 V), resulting in lower power dissipation in standby conditions. This part is ROHS3 compliant and Active. Operating temperature range extends to 150°C.

For Applications Permitting Enhanced Specifications:

SS22T3G (onsemi) maintains the 20 V, 2 A core specification with ROHS3 compliance and extended temperature range. However, this part carries a Last Time Buy status, indicating limited future availability. Selection should account for long-term supply chain requirements.

SK32B-LTP (Micro Commercial Co) provides 3 A current capacity at 20 V in the same DO-214AA package, suitable for designs where current margin is required. This part carries a Not For New Designs status and should be avoided for new product development.

STPS2L40U (STMicroelectronics) offers 40 V reverse voltage rating with 2 A current capacity, providing voltage margin for applications operating below 20 V. Forward voltage is reduced to 430 mV at 2 A, improving efficiency. This part is Active with extensive inventory (90,300 units) and ROHS3 compliance.

Compliance Considerations:

The original SS22/1 is RoHS non-compliant. All recommended substitutes (B220-13-F, SK22_R1_00001, SS22T3G, STPS2L40U) are ROHS3 compliant, addressing regulatory requirements for new designs and procurement in restricted substance jurisdictions.

Frequently Asked Questions (FAQ)

Q: Can B220-13-F directly replace SS22/1 without circuit modification?

A: Yes. B220-13-F maintains identical voltage (20 V), current (2 A), forward voltage (500 mV @ 2 A), and package specifications. The extended operating temperature range (-65 to 150°C versus -65 to 125°C) and ROHS3 compliance provide additional design margin without requiring circuit changes.

Q: What is the difference between SK22_R1_00001 and SS22T3G?

A: Both parts maintain 20 V, 2 A specifications and ROHS3 compliance. SK22_R1_00001 exhibits lower reverse leakage (90 µA @ 20 V) compared to SS22T3G (400 µA @ 40 V), resulting in reduced standby power dissipation. SS22T3G carries Last Time Buy status, indicating limited future availability. For new designs, SK22_R1_00001 is preferred.

Q: When should SK32B-LTP or STPS2L40U be selected instead of direct equivalents?

A: SK32B-LTP (20 V, 3 A) is selected when the application requires higher current capacity within the same voltage rating. STPS2L40U (40 V, 2 A) is selected when the application operates at voltages below 20 V and benefits from voltage margin or improved efficiency (430 mV forward voltage). Both parts require verification that the circuit design permits operation at the enhanced specification. SK32B-LTP carries Not For New Designs status and should not be used in new product development.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use DO-214AA (SMB) surface mount packaging, ensuring mechanical and thermal compatibility. Packaging variations exist in supplier formats: B220-13-F and SK32B-LTP are supplied in Cut Tape (CT) & Digi-Reel format, while SK22_R1_00001 and SS22T3G are supplied in Tape & Reel (TR) format. STPS2L40U is supplied in Cut Tape (CT) & Digi-Reel format. These variations affect procurement and assembly processes but do not impact electrical or mechanical compatibility.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: RoHS3 compliance restricts hazardous substances in electrical and electronic equipment. The original SS22/1 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, meeting regulatory requirements for products sold in restricted substance jurisdictions. For new designs and procurement in regulated markets, ROHS3-compliant parts are mandatory.

Q: Can STPS340U be used as a substitute?

A: STPS340U (40 V, 3 A) exceeds the electrical specifications of SS22/1 in both voltage and current. While the part is compatible in package and technology, it is not listed as a direct substitute in the provided data. Selection of STPS340U requires circuit-level verification that the application design permits operation at 40 V and 3 A ratings. This part is suitable only for applications where enhanced specifications provide functional benefit.

Q: What inventory considerations apply to substitute selection?

A: B220-13-F offers the highest inventory availability (65,310 units), followed by STPS2L40U (90,300 units) and SS22T3G (33,245 units). SK22_R1_00001 has lower availability (2,200 units). For applications requiring long-term supply security, B220-13-F or STPS2L40U are preferred. SS22T3G carries Last Time Buy status, indicating declining availability and unsuitability for long-term production commitments.

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