SL22/54 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SL22/54 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 part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and repair applications. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with compatible or enhanced ratings within the same package family.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	440 mV @ 2 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	400 µA @ 20 V	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55°C to 125°C	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the SL22/54 is determined by the following critical parameters:

Mandatory Matching Parameters:

Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 20 V minimum
Mounting Type: Surface Mount
Package / Case: DO-214AA, SMB

Functional Compatibility Parameters:

Current - Average Rectified (Io): 2 A minimum
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature Range: Must encompass or exceed -55°C to 125°C

Substitute parts are grouped into two categories:

Category 1 - Parametric Equivalents: Parts with identical electrical ratings (20 V, 2 A) and matching forward voltage characteristics. These provide direct functional replacement with potential improvements in compliance status or packaging format.

Category 2 - Functional Substitutes: Parts with equal or higher current ratings (3 A or 4 A) and matching voltage specifications. These provide enhanced current capacity while maintaining voltage and thermal performance within the same package envelope.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating)	RoHS Status	Product Status	Packaging
SL22/54	Vishay General Semiconductor	20 V	2 A	440 mV @ 2 A	400 µA @ 20 V	-55°C to 125°C	RoHS non-compliant	Discontinued	Bulk
SL22-E3/52T	Vishay General Semiconductor	20 V	2 A	440 mV @ 2 A	400 µA @ 20 V	-55°C to 125°C	ROHS3 Compliant	Active	Tape & Reel
B220-13-F	Diodes Incorporated	20 V	2 A	500 mV @ 2 A	500 µA @ 20 V	-65°C to 150°C	ROHS3 Compliant	Active	Cut Tape & Digi-Reel
SK22_R1_00001	Panjit International Inc.	20 V	2 A	500 mV @ 2 A	90 µA @ 20 V	-55°C to 150°C	ROHS3 Compliant	Active	Tape & Reel
SK32B-LTP	Micro Commercial Co	20 V	3 A	500 mV @ 3 A	500 µA @ 20 V	-55°C to 150°C	ROHS3 Compliant	Not For New Designs	Cut Tape & Digi-Reel
SK42BL-TP	Micro Commercial Co	20 V	4 A	450 mV @ 4 A	500 µA @ 20 V	-55°C to 150°C	ROHS3 Compliant	Not For New Designs	Tape & Reel
SS22T3G	onsemi	20 V	2 A	500 mV @ 2 A	400 µA @ 40 V	-55°C to 150°C	ROHS3 Compliant	Last Time Buy	Tape & Reel

Engineering Selection Recommendations

Primary Equivalent (Direct Replacement):

SL22-E3/52T is the primary equivalent for SL22/54. Both parts are manufactured by Vishay General Semiconductor and share identical electrical specifications: 20 V reverse voltage, 2 A average rectified current, and 440 mV forward voltage at 2 A. The SL22-E3/52T is currently active and ROHS3 compliant, addressing the compliance limitation of the discontinued SL22/54. The only difference is packaging format (Tape & Reel versus bulk), which does not affect electrical performance.

Secondary Equivalents (Electrical Match, Different Manufacturer):

B220-13-F (Diodes Incorporated) and SS22T3G (onsemi) provide electrical equivalence at the 20 V, 2 A rating. Both are ROHS3 compliant and active products. B220-13-F operates across an extended temperature range (-65°C to 150°C) compared to the original part. SS22T3G is designated Last Time Buy status. Forward voltage specifications differ slightly (500 mV versus 440 mV), which is within typical Schottky diode manufacturing tolerance and does not preclude functional substitution.

SK22_R1_00001 (Panjit International Inc.) matches the 20 V, 2 A electrical specification with notably lower reverse leakage current (90 µA versus 400 µA), representing improved performance characteristics. This part is active and ROHS3 compliant.

Functional Substitutes (Higher Current Rating):

SK32B-LTP and SK42BL-TP provide higher current ratings (3 A and 4 A respectively) while maintaining 20 V reverse voltage specification. Both parts are designated Not For New Designs, indicating end-of-life status. These substitutes are suitable for applications where current margin is required but should not be selected for new designs.

Compliance Consideration:

All substitute parts listed are ROHS3 compliant, whereas the original SL22/54 is RoHS non-compliant. Selection of any substitute part addresses regulatory compliance requirements for new production.

Frequently Asked Questions (FAQ)

Q: Can SL22-E3/52T directly replace SL22/54 in existing designs?

A: Yes. SL22-E3/52T is electrically and mechanically identical to SL22/54. Both parts share the same base product number (SL22), identical voltage and current ratings, and matching forward voltage characteristics. The difference in packaging format (Tape & Reel versus bulk) does not affect circuit performance.

Q: What is the difference between parametric equivalents and functional substitutes?

A: Parametric equivalents maintain identical electrical specifications (20 V, 2 A). Functional substitutes provide equal or higher current capacity (3 A or 4 A) while maintaining voltage compatibility. Both categories meet the mandatory matching parameters for the DO-214AA SMB package and Schottky technology.

Q: Are there compliance advantages to selecting a substitute part?

A: Yes. The original SL22/54 is RoHS non-compliant. All listed substitute parts are ROHS3 compliant, meeting current regulatory requirements for electronic components in restricted substance directives.

Q: Can SK32B-LTP or SK42BL-TP be used in applications designed for 2 A operation?

A: Yes. Both parts are rated for higher current (3 A and 4 A respectively) and maintain the same 20 V reverse voltage specification. The higher current rating provides design margin without affecting circuit operation at 2 A. However, both parts are designated Not For New Designs and should be used only for legacy system support.

Q: What is the significance of forward voltage differences among substitute parts?

A: Forward voltage variations (440 mV to 500 mV at rated current) are within normal Schottky diode manufacturing tolerance. These differences do not preclude functional substitution in typical rectifier applications. Circuit designs with tight voltage regulation requirements should verify forward voltage impact on system performance.

Q: Does the operating temperature range affect part selection?

A: The original SL22/54 operates from -55°C to 125°C. Most substitute parts extend this range to -55°C to 150°C or -65°C to 150°C, providing improved thermal margin. Selection should confirm that the substitute part's temperature range meets or exceeds the application's thermal requirements.

Q: Why are SK32B-LTP and SK42BL-TP marked "Not For New Designs"?

A: This designation indicates end-of-life status. These parts remain available for legacy system support but should not be incorporated into new product designs. For new applications, select from parts with Active status: SL22-E3/52T, B220-13-F, or SK22_R1_00001.

Q: Is reverse leakage current a critical parameter for substitution?

A: Reverse leakage current affects power dissipation and circuit performance in high-impedance applications. The original SL22/54 specifies 400 µA at 20 V. Substitute parts range from 90 µA (SK22_R1_00001) to 500 µA (B220-13-F, SK32B-LTP, SK42BL-TP). Selection should confirm that the substitute part's leakage current is acceptable for the application's power budget and circuit requirements.

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