SMAJ220C Equivalent & Substitute Parts

Part Overview

The SMAJ220C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 220V reverse standoff voltage rating and a 373.8V maximum clamping voltage with 1.1A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ220C is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	220	V
Voltage - Breakdown (Min)	233.1	V
Voltage - Clamping (Max) @ Ipp	373.8	V
Current - Peak Pulse (10/1000µs)	1.1	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 150	°C
Package / Case	DO-214AC (SMA)	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMAJ220C is determined by strict electrical and mechanical compatibility across the following parameters:

Voltage - Reverse Standoff (Typ): Must be 220V to maintain circuit protection threshold
Package / Case: Must be DO-214AC (SMA) for mechanical and thermal compatibility
Mounting Type: Must be Surface Mount for PCB assembly compatibility
Type: Must be Zener diode for functional equivalence
Bidirectional Channels: Must be 1 channel for circuit topology compatibility
Power - Peak Pulse: Must be 400W to ensure thermal performance under transient conditions

Substitute parts are qualified when these parameters match the original specification. Secondary parameters such as voltage breakdown minimum, clamping voltage maximum, and peak pulse current may vary within acceptable engineering tolerances while maintaining functional equivalence.

Parameter Comparison

Parameter	SMAJ220C (Littelfuse)	SMAJ220CA (Meritek)	SMAJ220CA-TP (Micro Commercial Co)	TV04A221JB-HF (Comchip Technology)
Voltage - Reverse Standoff (Typ)	220V	220V	220V	220V
Voltage - Breakdown (Min)	233.1V	246V	246V	246V
Voltage - Clamping (Max) @ Ipp	373.8V	356V	356V	356V
Current - Peak Pulse (10/1000µs)	1.1A	1.12A	1.1A	1.12A
Power - Peak Pulse	400W	400W	400W	400W
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 175°C	-55 to 150°C
Package / Case	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener	Zener
Bidirectional Channels	1	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

All three substitute parts meet the core electrical and mechanical requirements for direct replacement of the SMAJ220C. Selection should be based on the following criteria:

SMAJ220CA (Meritek): Active product status with ROHS3 compliance and standard temperature range (-55 to 150°C). Suitable for general applications where the reduced lower temperature limit is acceptable.

SMAJ220CA-TP (Micro Commercial Co): Active product status with extended upper temperature rating (-55 to 175°C). Recommended for applications requiring enhanced thermal performance or operation in elevated ambient conditions. RoHS compliance status not specified in available data.

TV04A221JB-HF (Comchip Technology): Active product status with ROHS3 compliance and standard temperature range (-55 to 150°C). Functionally equivalent with confirmed compliance certifications.

All substitute parts demonstrate lower maximum clamping voltage (356V versus 373.8V) and higher minimum breakdown voltage (246V versus 233.1V) compared to the original SMAJ220C, representing improved transient suppression characteristics within the 220V standoff voltage class.

Frequently Asked Questions (FAQ)

Q: Can SMAJ220CA, SMAJ220CA-TP, and TV04A221JB-HF be used interchangeably with SMAJ220C?

A: Yes, all three parts are electrically and mechanically compatible substitutes. They share identical reverse standoff voltage (220V), package type (DO-214AC/SMA), mounting configuration (surface mount), and peak pulse power rating (400W). Differences in clamping voltage and breakdown voltage are within acceptable engineering tolerances for TVS diode applications.

Q: What is the difference between the operating temperature ranges?

A: The original SMAJ220C operates from -65 to 150°C. Substitute parts operate from -55 to 150°C (SMAJ220CA, TV04A221JB-HF) or -55 to 175°C (SMAJ220CA-TP). The SMAJ220CA-TP offers the widest temperature range, making it suitable for applications requiring extended thermal performance.

Q: Are all substitute parts RoHS compliant?

A: SMAJ220CA and TV04A221JB-HF are confirmed ROHS3 compliant. RoHS compliance status for SMAJ220CA-TP is not specified in available documentation and should be verified with the manufacturer if RoHS certification is required.

Q: How do the clamping voltage specifications differ?

A: The original SMAJ220C has a maximum clamping voltage of 373.8V. All substitute parts have a maximum clamping voltage of 356V. This represents improved performance, as lower clamping voltage provides better transient suppression at the same standoff voltage rating.

Q: What packaging options are available for these substitutes?

A: SMAJ220CA is supplied in Tape & Reel (TR) packaging. SMAJ220CA-TP is supplied in Bulk packaging. TV04A221JB-HF is supplied in Tape & Reel (TR) packaging. All are compatible with automated surface-mount assembly processes.

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