SMAJ120C Equivalent & Substitute Parts

Part Overview

The SMAJ120C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 120V reverse standoff voltage with a 202.65V maximum clamping voltage and 2.1A peak pulse current capability in a DO-214AC (SMA) package.

The SMAJ120C is classified as obsolete. Equivalent and substitute parts are available from multiple manufacturers with active product status, offering comparable electrical performance and identical mechanical compatibility while maintaining full compliance with RoHS3 and MSL-1 requirements.

Substiute Parts

SMAJ120C

Littelfuse Inc.In Stock: 1101SMAJ120C Datasheet

Current PartRFQ

SMAJ120CA

EIC SEMICONDUCTOR INC.In Stock: 5429SMAJ120CA Datasheet

DirectRFQ

SMAJ120CA

EIC SEMICONDUCTOR INC.In Stock: 5429SMAJ120CA Datasheet

DirectRFQ

SMAJ120CA-13-F

Diodes IncorporatedIn Stock: 25485SMAJ120CA-13-F Datasheet

MFR RecommendedRFQ

SMAJ120CA-TP

Micro Commercial CoIn Stock: 5311SMAJ120CA-TP Datasheet

MFR RecommendedRFQ

SMAJ120CAE3/TR13

Microchip TechnologyIn Stock: 765SMAJ120CAE3/TR13 Datasheet

MFR RecommendedRFQ

SMAJ120CE3/TR13

Microchip TechnologyIn Stock: 665SMAJ120CE3/TR13 Datasheet

MFR RecommendedRFQ

TV04A121JB-G

Comchip TechnologyIn Stock: 875TV04A121JB-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMAJ120C is determined by strict adherence to the following electrical and mechanical parameters:

Mandatory Matching Parameters:

• Voltage - Reverse Standoff (Typ): 120V
• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• Bidirectional Channels: 1
• Type: Zener
• RoHS3 Compliance
• MSL-1 Rating

Allowable Parameter Variations:

• Voltage - Breakdown (Min): 126V to 133V
• Voltage - Clamping (Max) @ Ipp: 193V to 214V (within design tolerance)
• Current - Peak Pulse (10/1000µs): 1.6A to 2.6A (equal or greater)
• Power - Peak Pulse: 400W to 500W (equal or greater)
• Operating Temperature Range: -55°C to -65°C (minimum), 150°C to 175°C (maximum)
• Manufacturer: Any qualified semiconductor manufacturer

All substitute parts listed maintain identical reverse standoff voltage, package configuration, and compliance certifications. Variations in clamping voltage and peak pulse current remain within acceptable engineering tolerances for general-purpose transient voltage suppression applications.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are RoHS3 compliant and carry MSL-1 (Unlimited) moisture sensitivity ratings, matching the original SMAJ120C specifications. Selection among available substitutes is based on the following criteria:

For Direct Replacement with Identical Specifications: SMAJ120CA-TP (Micro Commercial Co) provides the closest electrical match with 2.1A peak pulse current, matching the original part's current rating, and extends the operating temperature range to 175°C maximum.

For Enhanced Performance: SMAJ120CAE3/TR13 (Microchip Technology) offers increased peak pulse current (2.6A) and power dissipation (500W), providing additional margin for transient suppression while maintaining the original 120V standoff voltage and DO-214AC package.

For Alternative Clamping Voltage: SMAJ120CE3/TR13 (Microchip Technology) provides a higher clamping voltage of 214V with enhanced power rating (500W), suitable for applications requiring tighter voltage control.

For Cost-Optimized Selection: SMAJ120CA (EIC Semiconductor Inc.) and TV04A121JB-G (Comchip Technology) are available in high inventory quantities and provide active product status with full compliance certifications.

All substitute parts maintain identical mechanical compatibility (DO-214AC, SMA package) and surface-mount configuration, requiring no PCB redesign or assembly process modification.

Frequently Asked Questions (FAQ)

Q: Can SMAJ120CA be used as a direct replacement for SMAJ120C?

A: Yes. SMAJ120CA maintains the same 120V reverse standoff voltage, DO-214AC package, and surface-mount configuration. The clamping voltage is 193V (versus 202.65V) and peak pulse current is 1.6A (versus 2.1A), both within acceptable engineering tolerances for general-purpose transient suppression. Product status is active with full RoHS3 and MSL-1 compliance.

Q: What is the difference between SMAJ120CA-TP and SMAJ120CAE3/TR13?

A: Both parts share the same 120V standoff voltage and DO-214AC package. SMAJ120CA-TP provides 2.1A peak pulse current and 400W power rating with an extended operating temperature range to 175°C. SMAJ120CAE3/TR13 provides higher peak pulse current (2.6A) and power rating (500W) with a standard operating range to 150°C. Selection depends on thermal and transient suppression requirements.

Q: Are all substitute parts available in tape and reel packaging?

A: Yes. All substitute parts listed are supplied in Tape & Reel (TR) packaging, maintaining compatibility with automated assembly processes.

Q: Does the higher clamping voltage of SMAJ120CE3/TR13 affect circuit compatibility?

A: SMAJ120CE3/TR13 maintains the same 120V reverse standoff voltage as the original part. The clamping voltage of 214V (versus 202.65V) represents a 5.6% increase. This part is suitable for applications where slightly higher transient voltage levels are acceptable or where tighter voltage control is not critical.

Q: Can I use parts with different peak pulse current ratings interchangeably?

A: Substitute parts with equal or greater peak pulse current ratings are compatible. Parts with lower ratings (such as SMAJ120CA at 1.6A) may be used if the application's transient current does not exceed the substitute part's specification. Verification against actual circuit transient profiles is required for critical applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance certification and MSL-1 (Unlimited) moisture sensitivity ratings, matching the original SMAJ120C environmental and regulatory requirements.