SMAJ75C Equivalent & Substitute Parts

Part Overview

The SMAJ75C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 75V reverse standoff voltage and 127.05V maximum clamping voltage at peak pulse current. The SMAJ75C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility across electrical ratings, mechanical packaging, and thermal operating ranges.

Substiute Parts

SMAJ75C

LittelfuseIn Stock: 751SMAJ75C Datasheet

Current PartRFQ

SMAJ75CA

MeritekIn Stock: 20196SMAJ75CA Datasheet

DirectRFQ

SMAJ75CA

MeritekIn Stock: 20196SMAJ75CA Datasheet

DirectRFQ

SMAJ75CA-13-F

Diodes IncorporatedIn Stock: 1617SMAJ75CA-13-F Datasheet

MFR RecommendedRFQ

SMAJ75CAE3/TR13

Microchip TechnologyIn Stock: 1247SMAJ75CAE3/TR13 Datasheet

MFR RecommendedRFQ

SMAJ75CE3/TR13

Microchip TechnologyIn Stock: 827SMAJ75CE3/TR13 Datasheet

MFR RecommendedRFQ

TV04A750JB-G

Comchip TechnologyIn Stock: 1145TV04A750JB-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ75C are qualified based on the following electrical and mechanical criteria:

Critical Parameters for Substitution:

• Reverse standoff voltage: 75V (exact match required)
• Package type: DO-214AC (SMA) surface mount (exact match required)
• Bidirectional channels: 1 (exact match required)
• Type: Zener diode (exact match required)
• Mounting type: Surface mount (exact match required)

Allowable Parameter Variations:

• Voltage - Breakdown (Min): 78.93V to 83.3V (within acceptable tolerance band)
• Voltage - Clamping (Max) @ Ipp: 121V to 134V (acceptable range for general-purpose protection)
• Current - Peak Pulse (10/1000µs): 3.3A to 4.1A (acceptable range for specified power dissipation)
• Power - Peak Pulse: 400W to 500W (acceptable range)
• Operating Temperature: -55°C to -65°C minimum; 150°C maximum (acceptable range)
• Product Status: Active preferred; obsolete acceptable for legacy applications

All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring environmental and moisture compatibility with the original specification.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts are qualified for direct replacement of the SMAJ75C in general-purpose transient voltage suppression applications. Selection among active alternatives should be based on the following criteria:

For Extended Temperature Range Applications (-65°C minimum required):

• SMAJ75CAE3/TR13 (Microchip Technology) - Supports -65°C to 150°C operating range with 500W peak pulse power
• SMAJ75CE3/TR13 (Microchip Technology) - Supports -65°C to 150°C operating range with 500W peak pulse power and 134V clamping voltage

For Standard Temperature Range Applications (-55°C minimum acceptable):

• SMAJ75CA (Meritek) - Active product with 20,100 pcs inventory availability
• SMAJ75CA-13-F (Diodes Incorporated) - Active product with 1,524 pcs inventory availability
• TV04A750JB-G (Comchip Technology) - Active product with 1,056 pcs inventory availability

All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard surface-mount assembly processes and environmental requirements. Selection should prioritize active products with adequate inventory for production continuity.

Frequently Asked Questions (FAQ)

Q: Can SMAJ75CA be used as a direct replacement for SMAJ75C?

A: Yes. SMAJ75CA maintains the critical electrical parameters (75V reverse standoff, DO-214AC package, 1-channel Zener configuration) and operates within the acceptable clamping voltage range (121V vs. 127.05V). The part is active and widely available. Operating temperature range is -55°C to 150°C, which is acceptable for most applications except those requiring -65°C minimum operation.

Q: What is the difference between SMAJ75CAE3/TR13 and SMAJ75CE3/TR13?

A: Both parts are manufactured by Microchip Technology and support the extended -65°C to 150°C operating temperature range. The primary difference is clamping voltage: SMAJ75CAE3/TR13 clamps at 121V maximum, while SMAJ75CE3/TR13 clamps at 134V maximum. Selection depends on circuit protection requirements and transient voltage tolerance specifications.

Q: Are all substitute parts available in Tape & Reel (TR) packaging?

A: Yes. All listed substitute parts are supplied in Tape & Reel packaging suitable for automated surface-mount assembly processes. This packaging format is standard for DO-214AC (SMA) TVS diodes in production environments.

Q: Does the SMAJ75C obsolescence affect the availability of substitute parts?

A: No. All qualified substitute parts are active products with current manufacturing status and available inventory. SMAJ75CA (Meritek) has the highest inventory level at 20,100 pcs, ensuring supply continuity for new designs and production requirements.

Q: Can substitute parts with higher peak pulse power (500W vs. 400W) be used?

A: Yes. Substitute parts rated for 500W peak pulse power (SMAJ75CAE3/TR13 and SMAJ75CE3/TR13) provide enhanced thermal performance and are fully compatible with applications designed for the 400W SMAJ75C. Higher power rating does not create compatibility issues.

Q: What packaging considerations apply to surface-mount assembly?

A: All substitute parts use DO-214AC (SMA) surface-mount packaging, identical to the SMAJ75C. No PCB layout modifications, footprint changes, or assembly process adjustments are required. MSL 1 rating applies to all parts, indicating unlimited shelf life under standard storage conditions.