SMAJ30HE3/61 Equivalent & Substitute Parts

Part Overview

The SMAJ30HE3/61 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the DO-214AC (SMA) package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a wide temperature range (-55°C to 150°C) and carries automotive-grade qualification under AEC-Q101, suitable for applications requiring reliable transient voltage protection.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMAJ30HE3/61
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Package / Case	DO-214AC, SMA
Voltage - Reverse Standoff (Typ)	30V
Voltage - Breakdown (Min)	33.3V
Voltage - Clamping (Max) @ Ipp	53.5V
Current - Peak Pulse (10/1000µs)	7.5A
Power - Peak Pulse	400W
Operating Temperature	-55°C ~ 150°C (TJ)
Grade	Automotive
Qualification	AEC-Q101
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SMAJ30HE3/61 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 30V
Voltage - Breakdown (Min): 33.3V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Unidirectional Channels: 1

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: 48.4V to 64.3V (acceptable range for transient suppression)
Current - Peak Pulse (10/1000µs): 7.5A to 36A (higher current capability acceptable)
Power - Peak Pulse: 400W to 500W (higher power rating acceptable)
Operating Temperature: -55°C to -65°C minimum; 150°C to 175°C maximum (equal or wider range acceptable)

Substitute parts must maintain identical reverse standoff voltage, breakdown voltage, and physical package specifications. Variations in clamping voltage, peak pulse current, and power dissipation are acceptable when higher performance is provided. All substitute parts must comply with RoHS3 and maintain MSL 1 classification.

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	Package
SMAJ30HE3/61	Vishay General Semiconductor - Diodes Division	30V	33.3V	53.5V	7.5A	400W	-55°C ~ 150°C (TJ)	Obsolete	DO-214AC, SMA
SM4T35AY	STMicroelectronics	30V	33.3V	64.3V	36A (8/20µs)	400W	-55°C ~ 150°C (TJ)	Active	DO-214AC, SMA
SMAJ30A	MDD	30V	33.3V	48.4V	8.3A	400W	-50°C ~ 150°C (TJ)	Active	DO-214AC, SMA
SMAJ30A-13-F	Diodes Incorporated	30V	33.3V	48.4V	8.3A	400W	-55°C ~ 150°C (TJ)	Active	DO-214AC, SMA
SMAJ30A-TP	Micro Commercial Co	30V	33.3V	48.4V	8.3A	400W	-55°C ~ 175°C (TA)	Active	DO-214AC, SMA
SMAJ30A-TR	STMicroelectronics	30V	33.3V	64.3V	36A (8/20µs)	400W	-55°C ~ 150°C (TJ)	Active	DO-214AC, SMA
SMAJ30E3/TR13	Microchip Technology	30V	33.3V	53.5V	9.3A	500W	-65°C ~ 150°C (TJ)	Active	DO-214AC, SMA
SZ1SMA30AT3G	Littelfuse Inc.	30V	33.3V	48.4V	8.3A	400W	-65°C ~ 150°C (TJ)	Active	DO-214AC, SMA

Engineering Selection Recommendations

All listed substitute parts are active products with current manufacturing status, eliminating obsolescence risk associated with the SMAJ30HE3/61. Selection among substitutes depends on specific application requirements:

For Direct Electrical Equivalence: SMAJ30E3/TR13 (Microchip Technology) provides the closest electrical match with identical 53.5V clamping voltage and maintains the same 30V reverse standoff specification. This part offers extended lower temperature operation (-65°C minimum) and increased power dissipation (500W), making it suitable for demanding automotive applications.

For Cost-Optimized Substitution: SMAJ30A variants (MDD, Diodes Incorporated, Micro Commercial Co) and SZ1SMA30AT3G (Littelfuse Inc.) provide functional equivalence with lower clamping voltages (48.4V) and comparable peak pulse current (8.3A). These parts maintain full compliance with RoHS3 and automotive-grade specifications where applicable.

For Enhanced Performance: SM4T35AY and SMAJ30A-TR (both STMicroelectronics) deliver significantly higher peak pulse current capability (36A at 8/20µs) and clamping voltage (64.3V), providing superior transient suppression margin. These parts are recommended for applications with higher energy transient events or where additional design margin is required.

All substitute parts maintain DO-214AC (SMA) package compatibility, surface mount mounting type, and unidirectional channel configuration. RoHS3 compliance and MSL 1 classification are consistent across all options.

Frequently Asked Questions (FAQ)

Q: Can SMAJ30A variants be used as direct replacements for SMAJ30HE3/61?

A: Yes. SMAJ30A variants maintain identical reverse standoff voltage (30V), breakdown voltage (33.3V), and package specifications (DO-214AC, SMA). The lower clamping voltage (48.4V vs. 53.5V) represents acceptable variation for TVS diode substitution, as it provides adequate transient suppression within the specified voltage window.

Q: What is the difference between SM4T35AY and SMAJ30A-TR?

A: Both parts are manufactured by STMicroelectronics and share identical electrical specifications (30V reverse standoff, 33.3V breakdown, 64.3V clamping, 36A peak pulse current). The primary difference is packaging designation: SM4T35AY uses the SM4TY series designation, while SMAJ30A-TR uses the SMAJ series designation. Both are functionally equivalent for circuit applications.

Q: Is automotive qualification required for all substitute parts?

A: The original SMAJ30HE3/61 carries AEC-Q101 automotive qualification. Among substitutes, SZ1SMA30AT3G explicitly maintains automotive-grade classification with AEC-Q101 qualification. Other active substitutes do not specify automotive qualification in provided data. For automotive applications requiring AEC-Q101 compliance, SZ1SMA30AT3G or SMAJ30E3/TR13 are recommended selections.

Q: What is the significance of operating temperature range differences?

A: Operating temperature ranges vary among substitutes: standard range is -55°C to 150°C; SMAJ30A-TP extends to 175°C maximum; SMAJ30E3/TR13 and SZ1SMA30AT3G extend to -65°C minimum. Selection depends on application environment. Extended temperature capability provides design margin for extreme operating conditions but is not required for standard industrial applications.

Q: Are all substitute parts available in tape and reel packaging?

A: Packaging availability varies. SM4T35AY, SMAJ30A-TR, SMAJ30E3/TR13, and SZ1SMA30AT3G are specified as tape and reel (TR) packaging. SMAJ30A (MDD) and SMAJ30A-13-F (Diodes Incorporated) specify alternative packaging formats. Verify packaging availability with component suppliers for production requirements.

Q: Can higher clamping voltage substitutes affect circuit performance?

A: TVS diodes with higher clamping voltages (64.3V vs. 53.5V) provide less aggressive transient suppression but remain within acceptable operating parameters for 30V standoff applications. Higher clamping voltage reduces energy dissipation during transient events. Circuit validation is not required for substitution within the specified parameter ranges, as all parts maintain the same reverse standoff and breakdown voltage specifications.

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