SMAJ7.0C Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SMAJ7.0C is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 7V reverse standoff voltage, 12.6V maximum clamping voltage, and 33.3A peak pulse current capability in a DO-214AC (SMA) package. The original Littelfuse SMAJ7.0C is classified as obsolete. Equivalent and substitute parts from active manufacturers are available to maintain design continuity and ensure supply chain reliability for applications requiring 7V TVS protection.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	7	V
Voltage - Breakdown (Min)	7.37	V
Voltage - Clamping (Max) @ Ipp	12.6	V
Current - Peak Pulse (10/1000µs)	33.3	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ7.0C are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 7V
Voltage - Clamping (Max) @ Ipp: 12V to 12.6V range
Current - Peak Pulse (10/1000µs): 33.3A minimum
Power - Peak Pulse: 400W minimum
Package / Case: DO-214AC (SMA)
Mounting Type: Surface Mount
Type: Zener, Bidirectional
Bidirectional Channels: 1

Substitute parts are grouped into two categories:

Category 1 - Direct Electrical Equivalents (400W, 33.3A): Parts with identical electrical specifications matching the original SMAJ7.0C performance envelope. These parts maintain the same peak pulse current and power dissipation ratings.

Category 2 - Enhanced Performance Substitutes (500W–600W, 41.7A–50A): Parts with higher peak pulse current and power ratings that operate within the same voltage parameters. These provide additional margin for transient protection and are suitable for applications where enhanced surge handling is beneficial.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	Package
SMAJ7.0C	Littelfuse Inc.	7V	12.6V	33.3A	400W	-65 to 150°C	Obsolete	DO-214AC (SMA)
SMAJ7.0CA	MDD	7V	12V	33.3A	400W	-50 to 150°C	Active	DO-214AC (SMA)
SMAJ7.0C	Taiwan Semiconductor Corporation	7V	13.3V	30.1A	400W	-55 to 150°C	Active	DO-214AC (SMA)
SMAJ7.0CA-E3/61	Vishay General Semiconductor - Diodes Division	7V	12V	33.3A	400W	-55 to 150°C	Active	DO-214AC (SMA)
ATV04A7V0JB-HF	Comchip Technology	7V	12V	33.33A	400W	-55 to 150°C	Active	DO-214AC (SMA)
SMA5J7.0CA-E3/5A	Vishay General Semiconductor - Diodes Division	7V	12V	41.7A	500W	-55 to 150°C	Active	DO-214AC (SMA)
SMA5J7.0CA-E3/61	Vishay General Semiconductor - Diodes Division	7V	12V	41.7A	500W	-55 to 150°C	Active	DO-214AC (SMA)
SMA6J7.0CA-TP	Micro Commercial Co	7V	12V	50A	600W	-55 to 175°C	Active	DO-214AC (SMA)
SMAJ7.0CA-13-F	Diodes Incorporated	7V	12V	33.3A	400W	-55 to 150°C	Active	DO-214AC (SMA)

Engineering Selection Recommendations

Direct Equivalents (Recommended for Drop-In Replacement):

SMAJ7.0CA (MDD), SMAJ7.0CA-E3/61 (Vishay), ATV04A7V0JB-HF (Comchip), and SMAJ7.0CA-13-F (Diodes Incorporated) provide electrical and mechanical equivalence to the original SMAJ7.0C. All are active products with ROHS3 compliance and MSL 1 rating. The Comchip ATV04A7V0JB-HF carries AEC-Q101 automotive qualification, suitable for automotive-grade applications. The Vishay SMAJ7.0CA-E3/61 is available in high volume (55,700 pcs in stock).

Enhanced Performance Alternatives:

SMA5J7.0CA-E3/5A and SMA5J7.0CA-E3/61 (Vishay, 500W, 41.7A) and SMA6J7.0CA-TP (Micro Commercial Co, 600W, 50A) operate at the same voltage parameters with increased current and power ratings. These are suitable for applications requiring additional transient margin or where higher surge events are anticipated. The SMA6J7.0CA-TP extends the operating temperature range to 175°C.

Selection Criteria:

For standard replacement: Select from direct equivalents with active product status and ROHS3 compliance.
For automotive applications: ATV04A7V0JB-HF with AEC-Q101 qualification.
For enhanced protection: SMA5J7.0CA or SMA6J7.0CA series with higher current and power ratings.
For high-temperature environments: SMA6J7.0CA-TP rated to 175°C.

Frequently Asked Questions (FAQ)

Q: Can SMAJ7.0CA directly replace the obsolete SMAJ7.0C?

A: Yes. SMAJ7.0CA from MDD and Vishay SMAJ7.0CA-E3/61 are direct electrical and mechanical equivalents. Both maintain 7V reverse standoff voltage, 12V clamping voltage, 33.3A peak pulse current, and 400W power rating in DO-214AC (SMA) packaging. No circuit modifications are required.

Q: What is the difference between 400W and 500W/600W rated parts?

A: The 400W parts (SMAJ7.0CA, SMAJ7.0CA-E3/61, ATV04A7V0JB-HF, SMAJ7.0CA-13-F) match the original SMAJ7.0C specifications. The 500W parts (SMA5J7.0CA series) handle 41.7A peak pulse current. The 600W part (SMA6J7.0CA-TP) handles 50A peak pulse current. Higher ratings provide additional transient protection margin but are electrically compatible with 7V protection circuits.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMAJ7.0C specifications.

Q: Which substitute is recommended for automotive applications?

A: ATV04A7V0JB-HF from Comchip Technology carries AEC-Q101 automotive qualification. This part is suitable for automotive-grade transient protection circuits requiring qualified component status.

Q: Can I use a higher-rated part (500W or 600W) in place of the 400W original?

A: Yes. SMA5J7.0CA and SMA6J7.0CA series maintain the same 7V voltage parameters and DO-214AC (SMA) package. Higher current and power ratings are backward compatible and provide additional protection margin. No circuit redesign is necessary.

Q: What is the operating temperature range difference?

A: The original SMAJ7.0C operates from -65°C to 150°C. Most active substitutes operate from -55°C to 150°C. The SMA6J7.0CA-TP extends to 175°C. Verify application temperature requirements before selection.

Q: Are packaging options different between substitutes?

A: All listed substitutes use DO-214AC (SMA) surface-mount packaging, matching the original SMAJ7.0C. Tape & Reel (TR) and Bulk packaging options are available from different manufacturers but do not affect electrical performance or PCB footprint compatibility.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message