SMAJ7.5C Equivalent & Substitute Parts

Part Overview

The SMAJ7.5C 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 7.5V reverse standoff voltage with a 14.65V maximum clamping voltage and 31A peak pulse current capability in a DO-214AC (SMA) package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and component sourcing.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	7.5V
Breakdown Voltage (Min)	7.89V
Clamping Voltage (Max) @ Ipp	14.65V
Peak Pulse Current (10/1000µs)	31A
Peak Pulse Power	400W
Package Type	DO-214AC (SMA)
Operating Temperature Range	-65°C to 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SMAJ7.5C is determined by the following critical parameters:

Reverse Standoff Voltage: Must be 7.5V (±tolerance)
Breakdown Voltage (Min): Must be 8.33V or higher
Package Type: Must be DO-214AC (SMA) for mechanical and electrical compatibility
Peak Pulse Current: Minimum 31A required; higher ratings are acceptable
Peak Pulse Power: Minimum 400W required; higher ratings are acceptable
Clamping Voltage: Operating range 12.9V to 14.3V is acceptable for this application class
Compliance: ROHS3 compliant, MSL 1 rating required

Substitute parts are grouped into two categories based on clamping voltage performance:

Group A (12.9V Clamping): SMAJ7.5CA, SMAJ7.5CA-13-F, SMAJ7.5CA-TP, TV04A7V5JB-G Group B (Higher Performance): SMAJ7.5CAE3/TR13 (38.8A, 500W), SMAJ7.5CE3/TR13 (14.3V clamp, 35A, 500W)

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ)	Vb (Min)	Vc (Max) @ Ipp	Ipp (A)	Ppk (W)	Temp Range	Status
SMAJ7.5C	Littelfuse Inc.	7.5V	7.89V	14.65V	31A	400W	-65°C to 150°C	Obsolete
SMAJ7.5CA	MDD	7.5V	8.33V	12.9V	31A	400W	-50°C to 150°C	Active
SMAJ7.5CA-13-F	Diodes Incorporated	7.5V	8.33V	12.9V	31A	400W	-55°C to 150°C	Active
SMAJ7.5CA-TP	Micro Commercial Co	7.5V	8.33V	12.9V	31A	400W	-55°C to 175°C	Active
SMAJ7.5CAE3/TR13	Microchip Technology	7.5V	8.33V	12.9V	38.8A	500W	-65°C to 150°C	Active
SMAJ7.5CE3/TR13	Microchip Technology	7.5V	8.33V	14.3V	35A	500W	-65°C to 150°C	Active
TV04A7V5JB-G	Comchip Technology	7.5V	8.33V	12.9V	31.01A	400W	-55°C to 150°C	Active

Engineering Selection Recommendations

All substitute parts listed are ROHS3 compliant with MSL 1 rating, meeting the compliance requirements of the original SMAJ7.5C.

For direct electrical equivalence with the original specification: SMAJ7.5CA (MDD), SMAJ7.5CA-13-F (Diodes Incorporated), SMAJ7.5CA-TP (Micro Commercial Co), and TV04A7V5JB-G (Comchip Technology) provide matching reverse standoff voltage, peak pulse current, and power dissipation ratings. These parts are suitable for applications where the original 14.65V clamping voltage is not critical.

For enhanced performance and margin: SMAJ7.5CAE3/TR13 (Microchip Technology) offers increased peak pulse current (38.8A) and power dissipation (500W) while maintaining the 12.9V clamping voltage, providing additional transient protection margin. SMAJ7.5CE3/TR13 (Microchip Technology) provides the highest clamping voltage (14.3V) with 35A peak pulse current and 500W power rating, suitable for applications requiring higher voltage suppression.

Temperature range considerations: SMAJ7.5CA-TP extends the upper operating temperature to 175°C (TA), offering broader thermal performance. SMAJ7.5CAE3/TR13 and SMAJ7.5CE3/TR13 maintain the original -65°C lower temperature limit, matching the Littelfuse specification.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the SMAJ7.5C?

A: All listed substitute parts share the same 7.5V reverse standoff voltage and DO-214AC (SMA) package, making them mechanically and electrically compatible. However, clamping voltage differences (12.9V to 14.3V versus the original 14.65V) may affect circuit performance in applications with tight voltage margins. Verify your circuit design tolerances before selection.

Q: What is the difference between the 12.9V and 14.3V clamping voltage groups?

A: The 12.9V clamping group (SMAJ7.5CA variants and TV04A7V5JB-G) provides lower voltage suppression, suitable for sensitive circuits. The 14.3V clamping group (SMAJ7.5CE3/TR13) provides higher voltage suppression, offering greater transient energy absorption. Selection depends on your protected circuit's voltage tolerance specifications.

Q: Are higher peak pulse current ratings (38.8A, 35A) backward compatible?

A: Yes. Higher peak pulse current and power ratings provide additional protection margin without affecting circuit operation. SMAJ7.5CAE3/TR13 (38.8A, 500W) and SMAJ7.5CE3/TR13 (35A, 500W) are direct upgrades in terms of transient handling capability while maintaining the same reverse standoff voltage.

Q: Does operating temperature range affect part selection?

A: Operating temperature range affects long-term reliability in extreme environments. SMAJ7.5CA-TP supports -55°C to 175°C (TA), extending upper temperature performance. SMAJ7.5CAE3/TR13 and SMAJ7.5CE3/TR13 support -65°C to 150°C (TJ), matching the original specification. Select based on your application's thermal environment.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting the compliance requirements of the original SMAJ7.5C.

Q: Which substitute offers the closest electrical match to the original SMAJ7.5C?

A: SMAJ7.5CA (MDD) and SMAJ7.5CA-13-F (Diodes Incorporated) provide the closest match with identical 7.5V standoff voltage, 31A peak pulse current, and 400W power rating. The primary difference is the 12.9V clamping voltage versus the original 14.65V, which is within acceptable tolerance for most general-purpose applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message