SS22 R5G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS22 R5G is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 20V DC reverse voltage and 2A average rectified current in a DO-214AA (SMB) surface mount package. This component is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing production and repair applications. The part operates across a junction temperature range of -55°C to 125°C and maintains ROHS3 compliance with unlimited moisture sensitivity level (MSL 1).

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	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS22 R5G is determined by strict electrical and mechanical parameter matching within the Schottky diode rectifier category. Direct equivalents must satisfy all of the following criteria:

Primary Substitution Criteria (Direct Equivalents):

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

Secondary Substitution Criteria (Similar Parts):

Voltage - DC Reverse (Vr) (Max): 20V
Package / Case: DO-214AA, SMB or compatible variant
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount
Current - Average Rectified (Io): 1A or 2A (reduced current rating acceptable for derating applications)

Parts are classified as direct equivalents when all primary criteria are met. Parts with reduced current ratings (1A versus 2A) or different forward voltage characteristics are classified as similar parts suitable for specific application contexts where current derating is acceptable.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Package	Product Status	RoHS Status	Tj (°C)
SS22 R5G	Taiwan Semiconductor Corporation	20	2	500 @ 2A	DO-214AA, SMB	Discontinued	ROHS3 Compliant	-55 to 125
SL22-E3/52T	Vishay General Semiconductor - Diodes Division	20	2	440 @ 2A	DO-214AA, SMB	Active	ROHS3 Compliant	-55 to 125
SL22-E3/5BT	Vishay General Semiconductor - Diodes Division	20	2	440 @ 2A	DO-214AA, SMB	Active	ROHS3 Compliant	-55 to 125
SL22-M3/52T	Vishay General Semiconductor - Diodes Division	20	2	440 @ 2A	DO-214AA, SMB	Active	ROHS3 Compliant	-55 to 125
B220-13-F	Diodes Incorporated	20	2	500 @ 2A	DO-214AA, SMB	Active	ROHS3 Compliant	-65 to 150
B220Q-13-F	Diodes Incorporated	20	2	500 @ 2A	DO-214AA, SMB	Active	ROHS3 Compliant	-65 to 150
5817SMJ/TR13	Microchip Technology	20	1	450 @ 1A	DO-214AA, SMB	Active	RoHS non-compliant	-55 to 150
B220A-13-F	Diodes Incorporated	20	2	500 @ 2A	DO-214AC, SMA	Active	ROHS3 Compliant	-65 to 150
CMSH1-20 BK PBFREE	Central Semiconductor Corp	20	1	550 @ 1A	DO-214AA, SMB	Active	ROHS3 Compliant	-65 to 150
SK12-LTP	Micro Commercial Co	20	1	500 @ 1A	DO-214AA, SMB	Not For New Designs	ROHS3 Compliant	-55 to 125
SK12E3/TR13	Microsemi Corporation	20	1	450 @ 1A	DO-214AA, SMB	Active	ROHS3 Compliant	-65 to 175

Engineering Selection Recommendations

Direct Equivalent Parts (Recommended Primary Substitutes):

The Vishay General Semiconductor SL22 series parts (SL22-E3/52T, SL22-E3/5BT, and SL22-M3/52T) provide direct electrical and mechanical equivalence to the SS22 R5G. All three parts maintain identical voltage and current ratings (20V, 2A), operate within the same junction temperature range (-55°C to 125°C), and are packaged in DO-214AA SMB format. These parts are currently in active production status with substantial inventory availability. The SL22 series exhibits lower forward voltage (440 mV @ 2A versus 500 mV @ 2A), resulting in improved thermal efficiency. All three variants maintain ROHS3 compliance.

Alternative Direct Equivalents (Secondary Substitutes):

The Diodes Incorporated B220-13-F and B220Q-13-F parts satisfy all primary substitution criteria with 20V, 2A ratings in DO-214AA SMB packaging. Both maintain ROHS3 compliance and active production status. The B220Q-13-F variant includes AEC-Q101 automotive qualification and is suitable for applications requiring automotive-grade components. These parts operate across an extended temperature range (-65°C to 150°C) compared to the original SS22 R5G specification.

Similar Parts with Current Derating (Acceptable for Reduced Load Applications):

Parts rated for 1A average rectified current (5817SMJ/TR13, CMSH1-20 BK PBFREE, SK12-LTP, SK12E3/TR13) are suitable for applications where the circuit load does not exceed 1A. These parts maintain the 20V reverse voltage rating and DO-214AA SMB package format. The 5817SMJ/TR13 from Microchip Technology is not RoHS compliant and should not be selected for new designs requiring RoHS3 compliance. The SK12-LTP is marked "Not For New Designs" and should be avoided for new product development.

Package Variant (Not Recommended for Direct Substitution):

The B220A-13-F from Diodes Incorporated uses a DO-214AC SMA package instead of DO-214AA SMB. This package variant is physically incompatible with PCB layouts designed for SMB footprints and requires board redesign. This part should only be selected if the application circuit has been redesigned to accommodate SMA package dimensions.

Frequently Asked Questions (FAQ)

Q: Can the SL22-E3/52T directly replace the SS22 R5G without circuit modification?

A: Yes. The SL22-E3/52T provides direct electrical and mechanical equivalence. Both parts are rated for 20V reverse voltage and 2A average rectified current in DO-214AA SMB packaging. The SL22-E3/52T exhibits lower forward voltage (440 mV versus 500 mV at 2A), which improves efficiency without affecting circuit functionality. No PCB layout changes are required.

Q: What is the difference between SL22-E3/52T, SL22-E3/5BT, and SL22-M3/52T?

A: All three Vishay parts are electrically identical with 20V, 2A ratings and identical forward voltage characteristics (440 mV @ 2A). The designations reflect different packaging configurations: -E3/52T and -E3/5BT indicate different tape and reel specifications, while -M3/52T represents a variant within the same electrical family. Selection between these three parts depends on packaging and supply chain requirements rather than electrical performance.

Q: Can I use the B220-13-F as a substitute if my application requires extended temperature operation?

A: Yes. The B220-13-F operates across -65°C to 150°C, extending the lower and upper temperature limits compared to the SS22 R5G (-55°C to 125°C). This part maintains 20V, 2A ratings and DO-214AA SMB packaging. If your application requires operation beyond the original -55°C to 125°C range, the B220-13-F provides additional thermal margin.

Q: Why are 1A-rated parts listed as similar rather than direct substitutes?

A: Parts rated for 1A average rectified current (such as CMSH1-20 BK PBFREE and SK12E3/TR13) have lower current capacity than the 2A-rated SS22 R5G. These parts are suitable only for applications where the actual circuit current does not exceed 1A. Using a 1A-rated part in a 2A application would cause thermal stress and potential component failure. These parts are classified as similar for applications requiring current derating.

Q: Is the B220Q-13-F suitable for automotive applications?

A: Yes. The B220Q-13-F carries AEC-Q101 automotive qualification and is rated for -65°C to 150°C operation. This part is suitable for automotive and industrial applications requiring automotive-grade component certification. The B220Q-13-F maintains 20V, 2A ratings and DO-214AA SMB packaging identical to the SS22 R5G.

Q: Why should I avoid the SK12-LTP for new designs?

A: The SK12-LTP is marked "Not For New Designs" by the manufacturer. This designation indicates the part is in end-of-life status and may have limited future availability. Additionally, the SK12-LTP is rated for only 1A, requiring current derating compared to the 2A SS22 R5G. For new product development, select from parts with "Active" product status such as the SL22 series or B220 series.

Q: Can I use the B220A-13-F if I modify my PCB layout?

A: The B220A-13-F uses a DO-214AC SMA package instead of DO-214AA SMB. While electrically equivalent (20V, 2A), the physical package dimensions are incompatible with SMB footprints. PCB layout modification would be required, including footprint redesign and potential trace routing changes. This substitution should only be considered if the application circuit is being redesigned. For direct board-level substitution without layout changes, select SMB-packaged alternatives.

Q: What is the significance of the 440 mV forward voltage in the SL22 series compared to 500 mV in the SS22 R5G?

A: The lower forward voltage (440 mV versus 500 mV at 2A) in the SL22 series results in reduced power dissipation and improved thermal efficiency. At 2A forward current, the SL22 dissipates approximately 12% less power than the SS22 R5G. This characteristic makes the SL22 series preferable for applications where thermal management is a design consideration, provided the circuit design does not depend on specific forward voltage characteristics.

Q: Are all recommended substitutes RoHS3 compliant?

A: Most recommended substitutes are ROHS3 compliant. The exception is the 5817SMJ/TR13 from Microchip Technology, which is marked as RoHS non-compliant. If your application or regulatory requirements mandate RoHS3 compliance, select from the SL22 series (Vishay), B220 series (Diodes Incorporated), CMSH1-20 BK PBFREE (Central Semiconductor), or SK12E3/TR13 (Microsemi).

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