1SMA75AT3G Equivalent & Substitute Parts

Part Overview

The 1SMA75AT3G is a Transient Voltage Suppressor (TVS) diode manufactured by onsemi, rated for 75V reverse standoff with 121V maximum clamping voltage and 3.3A peak pulse current. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of -65°C to 150°C and is packaged in the DO-214AC (SMA) surface mount format with unlimited moisture sensitivity level (MSL 1).

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	75V
Voltage - Breakdown (Min)	83.3V
Voltage - Clamping (Max) @ Ipp	121V
Current - Peak Pulse (10/1000µs)	3.3A
Power - Peak Pulse	400W
Type	Zener
Unidirectional Channels	1
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 1SMA75AT3G are qualified based on the following critical parameters:

Voltage - Reverse Standoff: 75V (exact match required)
Voltage - Clamping (Max) @ Ipp: 121V (exact match required)
Current - Peak Pulse (10/1000µs): 3.3A minimum
Package / Case: DO-214AC, SMA (exact match required)
Type: Zener, Unidirectional (1 channel)
Mounting Type: Surface Mount

Parts are categorized as direct substitutes when all critical electrical parameters and package specifications match the original component. Similar parts are identified where clamping voltage or peak pulse current may vary slightly but remain within acceptable application ranges for general-purpose transient voltage suppression.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Product Status	RoHS Status
1SMA75AT3G	onsemi	75V	121V	3.3A	400W	-65°C ~ 150°C (TJ)	Obsolete	Not specified
SMAJ75A	MDD	75V	121V	3.3A	400W	-50°C ~ 150°C (TJ)	Active	ROHS3 Compliant
SMAJ75A-13-F	Diodes Incorporated	75V	121V	3.3A	400W	-55°C ~ 150°C (TJ)	Active	ROHS3 Compliant
SMAJ75A-E3/61	Vishay General Semiconductor - Diodes Division	75V	121V	3.3A	400W	-55°C ~ 150°C (TJ)	Active	ROHS3 Compliant
SMAJ75A-M3/5A	Vishay General Semiconductor - Diodes Division	75V	121V	3.3A	400W	-55°C ~ 150°C (TJ)	Active	ROHS3 Compliant
SMAJ75A-M3/61	Vishay General Semiconductor - Diodes Division	75V	121V	3.3A	400W	-55°C ~ 150°C (TJ)	Active	ROHS3 Compliant
SMAJ75A-TP	Micro Commercial Co	75V	121V	3.3A	400W	-55°C ~ 175°C (TA)	Active	ROHS3 Compliant
SMAJ75AE3/TR13	Microchip Technology	75V	121V	4.1A	500W	-65°C ~ 150°C (TJ)	Active	ROHS3 Compliant
SMAJ75E3/TR13	Microchip Technology	75V	134V	3.7A	500W	-65°C ~ 150°C (TJ)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct substitutes with identical electrical specifications and active product status include SMAJ75A (MDD), SMAJ75A-13-F (Diodes Incorporated), SMAJ75A-E3/61 (Vishay), SMAJ75A-M3/5A (Vishay), SMAJ75A-M3/61 (Vishay), and SMAJ75A-TP (Micro Commercial Co). All direct substitutes maintain 75V reverse standoff, 121V clamping voltage, and 3.3A peak pulse current specifications. All substitute parts are ROHS3 compliant, addressing regulatory requirements for new designs.

SMAJ75AE3/TR13 (Microchip Technology) provides enhanced specifications with 4.1A peak pulse current and 500W power rating while maintaining identical voltage parameters, offering improved transient suppression capability within the same package footprint.

SMAJ75E3/TR13 (Microchip Technology) operates with a higher 134V clamping voltage and 3.7A peak pulse current. This part is suitable only for applications where the elevated clamping voltage is acceptable and does not compromise circuit protection requirements.

Temperature range considerations: The original 1SMA75AT3G operates to -65°C. Most active substitutes operate to -55°C minimum. SMAJ75AE3/TR13 and SMAJ75E3/TR13 maintain the -65°C lower temperature limit. SMAJ75A-TP extends the upper temperature to 175°C (TA), providing enhanced thermal performance for high-temperature applications.

Frequently Asked Questions (FAQ)

Q: Can SMAJ75A-TP be used as a direct replacement for 1SMA75AT3G?

A: Yes. SMAJ75A-TP maintains identical voltage specifications (75V standoff, 121V clamping) and current rating (3.3A peak pulse). The extended upper operating temperature to 175°C provides additional thermal margin. The lower temperature limit of -55°C is within acceptable range for most applications requiring the original -65°C specification; verify application requirements.

Q: What is the difference between SMAJ75AE3/TR13 and SMAJ75A-13-F?

A: Both parts share identical voltage parameters (75V standoff, 121V clamping). SMAJ75AE3/TR13 provides higher peak pulse current (4.1A vs 3.3A) and power rating (500W vs 400W), offering enhanced transient suppression capability. SMAJ75A-13-F maintains the original 3.3A specification. Selection depends on application transient energy requirements.

Q: Why does SMAJ75E3/TR13 have a different clamping voltage?

A: SMAJ75E3/TR13 operates at 134V maximum clamping voltage compared to 121V for the original part. This higher clamping voltage may allow greater transient overshoot in protected circuits. Use only when circuit design accommodates the elevated clamping voltage specification.

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

A: Yes. All listed substitute parts are available in Tape & Reel (TR) packaging suitable for automated assembly processes. Packaging specifications are consistent with the original DO-214AC (SMA) surface mount format.

Q: What compliance certifications apply to substitute parts?

A: All active substitute parts are ROHS3 compliant. The original 1SMA75AT3G (obsolete) does not specify RoHS compliance. All parts carry REACH Unaffected status and EAR99 export classification. HTSUS code 8541.10.0080 applies uniformly across all parts.

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