SMAJ22C Equivalent & Substitute Parts

Part Overview

The SMAJ22C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 22V reverse standoff voltage with a 37.28V maximum clamping voltage and 11.3A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ22C is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SMAJ22C

LittelfuseIn Stock: 974SMAJ22C Datasheet

Current PartRFQ

SMAJ22CA

MDDIn Stock: 31205SMAJ22CA Datasheet

MFR RecommendedRFQ

SMAJ22CA

MDDIn Stock: 31205SMAJ22CA Datasheet

MFR RecommendedRFQ

SMAJ22CA-13-F

Diodes IncorporatedIn Stock: 4615SMAJ22CA-13-F Datasheet

MFR RecommendedRFQ

SMAJ22CA-TP

Micro Commercial CoIn Stock: 5291SMAJ22CA-TP Datasheet

MFR RecommendedRFQ

SMAJ22CAE3/TR13

Microchip TechnologyIn Stock: 941SMAJ22CAE3/TR13 Datasheet

MFR RecommendedRFQ

SMAJ22CE3/TR13

Microchip TechnologyIn Stock: 846SMAJ22CE3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMAJ22C is determined by strict electrical and mechanical parameter matching within the TVS diode category. The following criteria establish valid substitutes:

Primary Matching Criteria:

• Reverse standoff voltage: 22V (identical)
• Bidirectional channels: 1 (identical)
• Package type: DO-214AC (SMA) (identical)
• Peak pulse current: 11.2A to 14.1A (within operational tolerance)
• Clamping voltage: 35.5V to 39.4V (acceptable range for protection function)
• Peak pulse power: 400W to 500W (equal or greater capability)
• RoHS3 compliance (regulatory requirement)
• Moisture sensitivity level: 1 (Unlimited) (identical)

All substitute parts listed maintain the core electrical specifications required for 22V protection circuits while offering active product status and improved availability compared to the obsolete SMAJ22C.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain active product status, ensuring long-term availability and manufacturing support. Selection among the SMAJ22CA, SMAJ22CA-13-F, SMAJ22CA-TP, SMAJ22CAE3/TR13, and SMAJ22CE3/TR13 should be based on the following factors:

For Standard Protection Requirements: SMAJ22CA (MDD), SMAJ22CA-13-F (Diodes Incorporated), and SMAJ22CA-TP (Micro Commercial Co) provide equivalent electrical performance with 35.5V clamping voltage and 11.2A to 11.3A peak pulse current. These parts are suitable for direct replacement in existing designs.

For Enhanced Current Handling: SMAJ22CAE3/TR13 (Microchip Technology) offers 14.1A peak pulse current and 500W peak pulse power, providing additional margin for transient protection in high-stress applications while maintaining the 35.5V clamping voltage.

For Higher Clamping Voltage Tolerance: SMAJ22CE3/TR13 (Microchip Technology) features a 39.4V maximum clamping voltage with 12.7A peak pulse current and 500W peak pulse power, suitable for applications requiring higher voltage suppression margins.

Packaging Considerations: Bulk packaging is available through SMAJ22CA (MDD). Tape & Reel packaging is available through SMAJ22CA-13-F, SMAJ22CA-TP, SMAJ22CAE3/TR13, and SMAJ22CE3/TR13 for automated assembly processes.

Temperature Range: SMAJ22CA-TP supports extended ambient temperature operation to 175°C (TA), compared to 150°C (TJ) for other alternatives, where applicable to thermal design requirements.

All substitute parts comply with ROHS3 regulations and maintain MSL 1 (Unlimited) moisture sensitivity classification, ensuring compatibility with standard PCB assembly and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can SMAJ22CA directly replace SMAJ22C in existing designs? A: Yes. SMAJ22CA maintains identical reverse standoff voltage (22V), bidirectional channel configuration (1), and DO-214AC (SMA) package type. The 35.5V clamping voltage is within the acceptable protection range for 22V circuits, and peak pulse current (11.3A) matches the original specification.

Q: What is the difference between SMAJ22CAE3/TR13 and SMAJ22CE3/TR13? A: Both are Microchip Technology products in Tape & Reel packaging. SMAJ22CAE3/TR13 provides 14.1A peak pulse current with 35.5V clamping voltage and 500W power rating. SMAJ22CE3/TR13 provides 12.7A peak pulse current with 39.4V clamping voltage and 500W power rating. Selection depends on whether higher current capacity or higher clamping voltage is prioritized for the application.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts (SMAJ22CA, SMAJ22CA-13-F, SMAJ22CA-TP, SMAJ22CAE3/TR13, and SMAJ22CE3/TR13) are ROHS3 compliant and maintain MSL 1 (Unlimited) moisture sensitivity classification.

Q: What packaging options are available? A: SMAJ22CA (MDD) is available in bulk packaging. SMAJ22CA-13-F (Diodes Incorporated), SMAJ22CA-TP (Micro Commercial Co), SMAJ22CAE3/TR13 (Microchip Technology), and SMAJ22CE3/TR13 (Microchip Technology) are available in Tape & Reel (TR) format for automated assembly.

Q: Which substitute offers the widest operating temperature range? A: SMAJ22CA-TP (Micro Commercial Co) supports -55 to 175°C ambient temperature range (TA), providing the broadest thermal operating window among the listed alternatives.

Q: Can I use SMAJ22CAE3/TR13 or SMAJ22CE3/TR13 for higher reliability margins? A: Both Microchip Technology parts offer 500W peak pulse power compared to 400W for other alternatives. SMAJ22CAE3/TR13 provides higher current capacity (14.1A), while SMAJ22CE3/TR13 provides higher clamping voltage (39.4V). Selection depends on circuit protection requirements.

Q: Are all substitute parts suitable for automated PCB assembly? A: SMAJ22CA-13-F, SMAJ22CA-TP, SMAJ22CAE3/TR13, and SMAJ22CE3/TR13 are supplied in Tape & Reel packaging for automated assembly. SMAJ22CA (MDD) is available in bulk packaging and requires manual placement or custom reel preparation.