Equivalent & Substitute Parts for SMAJ85CA-13

Part Overview

The SMAJ85CA-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 an 85V reverse standoff voltage with a 137V maximum clamping voltage and 2.9A peak pulse current capability in a compact SMA (DO-214AC) package.

The SMAJ85CA-13 is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from active product lines that maintain electrical compatibility or offer enhanced performance characteristics within the same package form factor.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	85	V
Voltage - Breakdown (Min)	94.4	V
Voltage - Clamping (Max) @ Ipp	137	V
Current - Peak Pulse (10/1000µs)	2.9	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ85CA-13 are grouped based on electrical parameter compatibility within the TVS diode category. The primary substitution criteria are:

Voltage - Reverse Standoff: Must be 85V (±tolerance as specified by manufacturer)
Package / Case: Must be DO-214AC (SMA) for mechanical and thermal compatibility
Mounting Type: Surface mount configuration required
Bidirectional Channels: Single channel configuration
Type: Zener diode technology

Substitutes are classified into two categories:

Direct Electrical Equivalents: Parts with identical or near-identical clamping voltage (137V) and peak pulse current (2.9A to 2.92A), differing only in packaging format or manufacturer.
Enhanced Performance Alternatives: Parts with the same reverse standoff voltage and package but higher peak pulse current capability (13A to 22.5A) and correspondingly higher clamping voltages (146V to 178V), suitable for applications requiring greater transient energy absorption.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	RoHS Status
SMAJ85CA-13	Diodes Incorporated	Discontinued	85	137	2.9	400	-55 to 150	DO-214AC, SMA	Non-compliant
SMAJ85CA-13-F	Diodes Incorporated	Active	85	137	2.9	400	-55 to 150	DO-214AC, SMA	ROHS3 Compliant
SMAJ85CA	Meritek	Active	85	137	2.92	400	-55 to 150	DO-214AC, SMA	ROHS3 Compliant
SMA6J85CA-TR	STMicroelectronics	Active	85	146	22.5 (8/20µs)	600	-55 to 175	DO-214AC, SMA	ROHS3 Compliant
SMAJ85CA-TR	STMicroelectronics	Active	85	178	13 (8/20µs)	400	-55 to 150	DO-214AC, SMA	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Electrical Equivalence):

SMAJ85CA-13-F (Diodes Incorporated) and SMAJ85CA (Meritek) are direct electrical equivalents to the SMAJ85CA-13. Both maintain identical reverse standoff voltage (85V), clamping voltage (137V), and peak pulse current (2.9A to 2.92A). SMAJ85CA-13-F is the preferred choice as it is from the original manufacturer and carries ROHS3 compliance certification. SMAJ85CA offers higher inventory availability (37,100 units) and is suitable where manufacturer flexibility is acceptable.

Enhanced Performance Alternatives:

SMA6J85CA-TR (STMicroelectronics) and SMAJ85CA-TR (STMicroelectronics) provide higher transient energy absorption capability while maintaining the 85V reverse standoff voltage and SMA package form factor. SMA6J85CA-TR offers 22.5A peak pulse current with 146V clamping voltage and extended operating temperature range (-55°C to 175°C). SMAJ85CA-TR provides 13A peak pulse current with 178V clamping voltage. These alternatives are suitable for applications requiring greater overvoltage protection margin or higher transient current handling.

All substitute parts carry ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can SMAJ85CA-13-F be used as a direct replacement for SMAJ85CA-13?

A: Yes. SMAJ85CA-13-F is electrically identical to SMAJ85CA-13, with the same 85V reverse standoff voltage, 137V clamping voltage, and 2.9A peak pulse current. The primary difference is packaging format (Tape & Reel) and ROHS3 compliance certification. It is the recommended direct replacement.

Q: What is the difference between the direct equivalents and the enhanced performance alternatives?

A: Direct equivalents (SMAJ85CA-13-F, SMAJ85CA) maintain identical electrical specifications. Enhanced alternatives (SMA6J85CA-TR, SMAJ85CA-TR) feature higher peak pulse current ratings (13A to 22.5A) and higher clamping voltages (146V to 178V), providing greater transient energy absorption. Selection depends on application requirements for overvoltage protection margin and transient current capacity.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts use the DO-214AC (SMA) package form factor and are surface-mount components. They are mechanically and thermally compatible with the original SMAJ85CA-13 footprint.

Q: Which substitute part has the highest inventory availability?

A: SMAJ85CA (Meritek) has the highest inventory with 37,100 units in stock, followed by SMAJ85CA-TR (STMicroelectronics) with 30,200 units.

Q: Do all substitute parts meet current regulatory compliance standards?

A: Yes. All active substitute parts carry ROHS3 compliance and REACH unaffected status. The original SMAJ85CA-13 is RoHS non-compliant; substitutes provide compliance for new designs.

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