SMAJ85-E3/5A Equivalent & Substitute Parts

Part Overview

The SMAJ85-E3/5A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with an 85V reverse standoff voltage and provides clamping at 151V maximum. The SMAJ85-E3/5A is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain the same reverse standoff voltage and package form factor while offering improved availability and active product status.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	85	V
Voltage - Breakdown (Min)	94.4	V
Voltage - Clamping (Max) @ Ipp	151	V
Current - Peak Pulse (10/1000µs)	2	A
Power - Peak Pulse	300	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AC, SMA	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the SMAJ85-E3/5A are selected based on the following critical parameters that determine functional equivalence:

Reverse Standoff Voltage: 85V (all substitutes maintain this specification)
Package / Case: DO-214AC, SMA (identical form factor for PCB compatibility)
Mounting Type: Surface Mount (consistent with original design)
Unidirectional Channels: 1 (single-channel protection topology)
Type: Zener (TVS diode classification)
RoHS Status: ROHS3 Compliant (regulatory requirement maintained)

Substitute parts may vary in clamping voltage (137V vs. 151V), peak pulse current (2.2A to 2.9A), and peak pulse power (300W to 400W). These variations remain within acceptable operating parameters for general-purpose transient suppression applications while maintaining the same reverse standoff voltage threshold.

Parameter Comparison

Parameter	SMAJ85-E3/5A (Original)	SMAJ85A-E3/5A (Vishay)	SMAJ85A (MDD)	SMAJ85A-13-F (Diodes Inc.)	SMAJ85A-TP (MCC)
Manufacturer	Vishay	Vishay	MDD	Diodes Incorporated	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active	Active
Reverse Standoff Voltage (Typ)	85V	85V	85V	85V	85V
Voltage - Breakdown (Min)	94.4V	94.4V	94.4V	94.4V	94.4V
Voltage - Clamping (Max) @ Ipp	151V	137V	137V	137V	137V
Current - Peak Pulse (10/1000µs)	2A	2.2A	2.9A	2.9A	2.9A
Power - Peak Pulse	300W	300W	400W	400W	400W
Operating Temperature Range	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-50 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 175°C (TA)
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory Status	924 Pcs	952 Pcs	36900 Pcs	12332 Pcs	5713 Pcs

Engineering Selection Recommendations

All substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), ensuring regulatory and environmental compatibility with the original SMAJ85-E3/5A design.

SMAJ85A-E3/5A (Vishay) provides the closest electrical match with identical clamping voltage (151V) and operating temperature range (-55 to 150°C TJ). This part is manufactured by the original equipment supplier and carries active product status with 952 units in stock.

SMAJ85A (MDD), SMAJ85A-13-F (Diodes Incorporated), and SMAJ85A-TP (Micro Commercial Co) offer improved peak pulse current ratings (2.9A) and power dissipation (400W) compared to the original specification. These parts feature lower clamping voltages (137V) and represent enhanced performance alternatives. SMAJ85A-TP extends the operating temperature range to 175°C (TA), providing additional thermal margin for high-temperature applications.

All substitute parts are classified as active products with established supply chains, addressing the obsolescence status of the original SMAJ85-E3/5A.

Frequently Asked Questions (FAQ)

Q: Can SMAJ85A-E3/5A replace SMAJ85-E3/5A directly?

A: Yes. Both parts share identical reverse standoff voltage (85V), breakdown voltage (94.4V), package form factor (DO-214AC, SMA), and operating temperature range (-55 to 150°C). The SMAJ85A-E3/5A maintains the same clamping voltage (151V) as the original part.

Q: What is the difference between SMAJ85A-E3/5A and SMAJ85A?

A: SMAJ85A-E3/5A is manufactured by Vishay with clamping voltage of 151V and peak pulse current of 2.2A. SMAJ85A (MDD) has clamping voltage of 137V and peak pulse current of 2.9A. Both maintain the same 85V reverse standoff voltage and DO-214AC package.

Q: Are the lower clamping voltage substitutes (137V) acceptable?

A: Lower clamping voltage (137V vs. 151V) provides tighter voltage regulation during transient events. This is acceptable for applications where the original 151V clamping specification was not a critical design constraint. Verify circuit requirements before selection.

Q: Do all substitutes use the same DO-214AC package?

A: Yes. All substitute parts use DO-214AC (SMA) package, ensuring identical PCB footprint and mounting compatibility with the original SMAJ85-E3/5A design.

Q: Which substitute offers the best thermal performance?

A: SMAJ85A-TP (Micro Commercial Co) extends the operating temperature range to 175°C (TA), providing the widest thermal operating window among available substitutes.

Q: Are all substitutes RoHS compliant?

A: Yes. All substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), matching the regulatory status of the original SMAJ85-E3/5A.

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