SMB8J22C-E3/52 Equivalent & Substitute Parts

Part Overview

The SMB8J22C-E3/52 is a bidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This surface mount component in DO-214AA (SMB) package is designed for general-purpose transient voltage suppression applications. The part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMB8J22C-E3/52
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Voltage - Reverse Standoff (Typ)	22V
Voltage - Breakdown (Min)	24.4V
Voltage - Clamping (Max) @ Ipp	39.4V
Current - Peak Pulse (10/1000µs)	20.3A
Power - Peak Pulse	800W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Type	Zener
Bidirectional Channels	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the SMB8J22C-E3/52 is determined by strict electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 22V (exact match required)
Voltage - Breakdown (Min): 24.4V (exact match required)
Bidirectional Channels: 1 (exact match required)
Type: Zener (exact match required)

Mechanical Compatibility Criteria:

Package / Case: DO-214AA, SMB (exact match required)
Mounting Type: Surface Mount (exact match required)

Regulatory & Environmental Criteria:

RoHS Status: ROHS3 Compliant (minimum requirement)
Moisture Sensitivity Level (MSL): 1 (Unlimited) (minimum requirement)

Substitute parts must maintain identical reverse standoff voltage, breakdown voltage, and package configuration. Variations in clamping voltage, peak pulse current, and peak pulse power are acceptable provided the substitute part meets or exceeds the application requirements. All substitute parts listed are active products with current manufacturer support, addressing the obsolescence status of the original part.

Parameter Comparison

Parameter	SMB8J22C-E3/52 (Main)	SMB8J22CA-E3/52	1SMB22CA TR13 PBFREE	SMBJ22CA (MDD)	SMBJ22CA-HR	SMBJ22CA-HRA	SMBJ22CA-TR	SMBJ22CAE3/TR13
Manufacturer	Vishay	Vishay	Central Semiconductor	MDD	Littelfuse	Littelfuse	STMicroelectronics	Microchip
Voltage - Reverse Standoff (Typ)	22V	22V	22V	22V	22V	22V	22V	22V
Voltage - Breakdown (Min)	24.4V	24.4V	24.4V	24.4V	24.4V	24.4V	24.4V	24.4V
Voltage - Clamping (Max) @ Ipp	39.4V	35.5V	35.5V	35.5V	35.5V	35.5V	35.5V	35.5V
Current - Peak Pulse (10/1000µs)	20.3A	22.5A	16.9A	16.9A	16.9A	16.9A	17.7A	16.9A
Power - Peak Pulse	800W	800W	600W	600W	600W	600W	600W	600W
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-50°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener	Zener	Zener	Zener	Zener	Zener
Bidirectional Channels	1	1	1	1	1	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain electrical compatibility with the SMB8J22C-E3/52 across the critical parameters of reverse standoff voltage (22V), breakdown voltage (24.4V), and package configuration (DO-214AA SMB). All substitutes are active products with current manufacturer support, eliminating obsolescence risk.

Primary Substitute - Direct Vishay Replacement: SMB8J22CA-E3/52 from Vishay General Semiconductor - Diodes Division is the direct active-product equivalent. This part maintains the same manufacturer lineage, identical electrical specifications for standoff and breakdown voltages, and equivalent thermal performance (-55°C ~ 150°C). Peak pulse current increases to 22.5A with maintained 800W peak pulse power, providing enhanced transient suppression capability.

Alternative Substitutes - Multi-Manufacturer Options: SMBJ22CA-TR (STMicroelectronics), SMBJ22CA-HR and SMBJ22CA-HRA (Littelfuse), SMBJ22CAE3/TR13 (Microchip), SMBJ22CA (MDD), and 1SMB22CA TR13 PBFREE (Central Semiconductor) all meet the core electrical and mechanical compatibility requirements. These parts feature reduced peak pulse power (600W) compared to the original specification, which is acceptable for applications where the original 800W rating was not fully utilized. All substitutes maintain ROHS3 compliance and MSL 1 rating.

Temperature Range Considerations: Central Semiconductor (1SMB22CA TR13 PBFREE), Littelfuse (SMBJ22CA-HR, SMBJ22CA-HRA), and Microchip (SMBJ22CAE3/TR13) offer extended lower temperature operation to -65°C, compared to the original -55°C specification. MDD's SMBJ22CA operates to -50°C. STMicroelectronics SMBJ22CA-TR matches the original -55°C lower limit. Selection should account for application temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can SMB8J22CA-E3/52 directly replace SMB8J22C-E3/52? A: Yes. SMB8J22CA-E3/52 is the direct active-product substitute from the same manufacturer (Vishay). It maintains identical reverse standoff voltage (22V), breakdown voltage (24.4V), and package configuration (DO-214AA SMB). The part is currently in active production status.

Q: What is the difference between the main part's 39.4V clamping voltage and the substitutes' 35.5V clamping voltage? A: The clamping voltage represents the maximum voltage across the diode during transient suppression at peak pulse current. The substitutes' lower clamping voltage (35.5V vs. 39.4V) indicates more aggressive voltage suppression. This is acceptable and often beneficial for circuit protection, provided the application can tolerate the lower clamping threshold.

Q: Are all substitute parts pin-compatible with the original SMB8J22C-E3/52? A: Yes. All substitute parts use the identical DO-214AA (SMB) package with the same pinout and footprint. No PCB layout modifications are required for substitution.

Q: Why do some substitutes have lower peak pulse power (600W vs. 800W)? A: Peak pulse power is a function of clamping voltage and peak pulse current. The substitutes achieve lower clamping voltage with comparable or slightly lower peak pulse current, resulting in reduced peak pulse power. This is acceptable for applications where the original 800W rating was not a limiting design factor.

Q: Which substitute offers the widest operating temperature range? A: Central Semiconductor (1SMB22CA TR13 PBFREE), Littelfuse (SMBJ22CA-HR, SMBJ22CA-HRA), and Microchip (SMBJ22CAE3/TR13) all operate from -65°C to 150°C, providing the widest lower temperature specification. The original part and STMicroelectronics SMBJ22CA-TR operate from -55°C to 150°C.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's regulatory status.

Q: What is the difference between tape & reel (TR) and cut tape (CT) packaging options? A: Tape & reel (TR) packaging is supplied on continuous tape wound on reels for automated assembly processes. Cut tape (CT) is supplied in shorter tape segments. Both formats contain identical components; packaging format selection depends on assembly equipment and volume requirements.

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