SMAJ70CA-13 Equivalent & Substitute Parts

Part Overview

The SMAJ70CA-13 is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 70V reverse standoff voltage with 113V maximum clamping voltage and 4.6A peak pulse current capability in a DO-214AC (SMA) package.

The SMAJ70CA-13 is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers, offering identical or enhanced electrical characteristics while maintaining mechanical compatibility with the original design.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	70V	V
Voltage - Breakdown (Min)	77.8V	V
Voltage - Clamping (Max) @ Ipp	113V	V
Current - Peak Pulse (10/1000µs)	4.6A	A
Power - Peak Pulse	400W	W
Operating Temperature Range	-55°C to 150°C	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ70CA-13 are classified based on electrical parameter compatibility. The primary substitution criteria are:

Electrical Compatibility Parameters:

Voltage - Reverse Standoff (Typ): 70V
Voltage - Breakdown (Min): 77.8V minimum
Voltage - Clamping (Max) @ Ipp: 113V or lower
Current - Peak Pulse (10/1000µs): 4.6A or higher
Power - Peak Pulse: 400W or higher
Package / Case: DO-214AC, SMA

Substitution Categories:

Direct Equivalents maintain identical electrical specifications (70V standoff, 113V clamp, 4.6A peak pulse, 400W power rating) with the same package and mounting type.

Enhanced Performance Substitutes provide superior electrical characteristics (higher peak pulse current, higher power rating, or extended temperature range) while maintaining the same voltage ratings and package compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	RoHS Status
SMAJ70CA-13	Diodes Incorporated	70V	77.8V	113V	4.6A	400W	-55°C to 150°C	Discontinued	RoHS non-compliant
SMAJ70CA-13-F	Diodes Incorporated	70V	77.8V	113V	4.6A	400W	-55°C to 150°C	Active	ROHS3 Compliant
SMAJ70CA-TP	Micro Commercial Co	70V	77.8V	113V	4.6A	400W	-55°C to 175°C	Active	ROHS3 Compliant
SMAJ70CA	MDD	70V	77.8V	113V	4.6A	400W	-50°C to 150°C	Active	ROHS3 Compliant
P4SMA82CA	Eaton - Electronics Division	70.1V	77.9V	113V	3.6A	400W	-55°C to 150°C	Active	RoHS Compliant
SMAJ70CA-TR	STMicroelectronics	70V	77.8V	146V	16A (8/20µs)	400W	-55°C to 150°C	Active	ROHS3 Compliant
SMA6J70CA-TR	STMicroelectronics	70V	77.8V	120V	27A (8/20µs)	600W	-55°C to 175°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

SMAJ70CA-13-F (Diodes Incorporated) is the primary direct equivalent. It maintains all electrical specifications of the original part while offering ROHS3 compliance and active product status. This part is recommended for applications requiring exact electrical performance matching.

SMAJ70CA-TP (Micro Commercial Co) provides identical electrical specifications with extended operating temperature range (-55°C to 175°C) and ROHS3 compliance. This option is suitable for applications with elevated ambient temperature requirements.

SMAJ70CA (MDD) offers identical electrical specifications with ROHS3 compliance and active status. The operating temperature range is -50°C to 150°C, which is acceptable for most general-purpose applications.

P4SMA82CA (Eaton - Electronics Division) provides marginally enhanced specifications (70.1V standoff, 77.9V breakdown, 3.6A peak pulse) with RoHS compliance. This part is suitable for applications where slight parameter variations are acceptable.

For Enhanced Performance:

SMAJ70CA-TR (STMicroelectronics) offers significantly higher peak pulse current (16A at 8/20µs) and clamping voltage (146V) while maintaining the same 400W power rating. This part is suitable for applications requiring higher transient energy absorption.

SMA6J70CA-TR (STMicroelectronics) provides the highest performance specification with 27A peak pulse current (8/20µs), 120V clamping voltage, and 600W power rating. Extended operating temperature range (-55°C to 175°C) is available. This part is recommended for demanding applications with severe transient conditions.

All substitute parts maintain DO-214AC (SMA) package compatibility and surface-mount configuration with the original SMAJ70CA-13.

Frequently Asked Questions (FAQ)

Q: Can SMAJ70CA-13-F be used as a direct replacement for SMAJ70CA-13?

A: Yes. SMAJ70CA-13-F maintains identical electrical specifications (70V standoff, 113V clamp, 4.6A peak pulse, 400W power) and package configuration. The primary difference is ROHS3 compliance and active product status. This is the recommended direct equivalent.

Q: What is the difference between SMAJ70CA-TP and SMAJ70CA-13?

A: Electrical specifications are identical. SMAJ70CA-TP offers extended operating temperature range (-55°C to 175°C versus -55°C to 150°C) and ROHS3 compliance. Both use DO-214AC (SMA) packaging.

Q: Can I use SMAJ70CA-TR or SMA6J70CA-TR as replacements?

A: These parts have different electrical characteristics. SMAJ70CA-TR has higher clamping voltage (146V) and peak pulse current (16A). SMA6J70CA-TR has even higher specifications (120V clamp, 27A peak pulse, 600W power). Use these only if your circuit design accommodates the different voltage and current parameters.

Q: Are all substitute parts RoHS compliant?

A: Most substitute parts are ROHS3 compliant. The original SMAJ70CA-13 is RoHS non-compliant. SMAJ70CA-13-F, SMAJ70CA-TP, SMAJ70CA (MDD), SMAJ70CA-TR, and SMA6J70CA-TR are all ROHS3 compliant. P4SMA82CA is RoHS compliant.

Q: Do all substitute parts use the same package?

A: Yes. All listed substitute parts use DO-214AC (SMA) surface-mount package, maintaining mechanical compatibility with the original SMAJ70CA-13.

Q: What is the difference between 10/1000µs and 8/20µs pulse specifications?

A: These represent different test pulse waveforms. The 10/1000µs waveform is standard for TVS diode specifications. The 8/20µs waveform is used for surge testing. Parts specified with 8/20µs current ratings (SMAJ70CA-TR, SMA6J70CA-TR) indicate performance under this alternative test condition.

Q: Which substitute part should I choose for a new design?

A: For new designs, SMAJ70CA-13-F or SMAJ70CA-TP are recommended. Both offer ROHS3 compliance, active product status, and identical or superior electrical performance. SMAJ70CA-TP provides extended temperature range if needed.

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