1SMA5.0AT3 Equivalent & Substitute Parts

Part Overview

The 1SMA5.0AT3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, rated for 5V reverse standoff with a 9.2V maximum clamping voltage and 44.6A peak pulse current. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part is housed in a DO-214AC (SMA) surface mount package and is suitable for general-purpose transient protection applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	5	V
Voltage - Breakdown (Min)	6.4	V
Voltage - Clamping (Max) @ Ipp	9.2	V
Current - Peak Pulse (10/1000µs)	44.6	A
Power - Peak Pulse	400	W
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature	-65 to 150	°C (TJ)
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the 1SMA5.0AT3 are categorized based on strict electrical and mechanical compatibility criteria:

Direct Electrical Equivalents (Same Clamping Voltage & Peak Current):

Voltage - Reverse Standoff: 5V
Voltage - Clamping (Max) @ Ipp: 9.2V
Current - Peak Pulse (10/1000µs): 44.6A
Package: DO-214AC (SMA) surface mount

Parts meeting these criteria are considered direct substitutes with identical electrical performance and package compatibility.

Similar Parts (Same Standoff Voltage, Different Clamping Voltage or Peak Current):

Voltage - Reverse Standoff: 5V
Voltage - Clamping (Max) @ Ipp: 13.4V (higher clamping voltage)
Current - Peak Pulse (10/1000µs): 174A to 298A (higher peak current)
Package: DO-214AC (SMA) or alternative surface mount packages

These parts share the same reverse standoff voltage but offer enhanced transient suppression capability with higher clamping voltages and peak current ratings. Package variations include DO-221AC (SlimSMA) and SOD-123W.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package / Case	Product Status	RoHS Status
1SMA5.0AT3	onsemi	5	9.2	44.6	400	DO-214AC, SMA	Obsolete	Non-compliant
SMAJ5.0A	MDD	5	9.2	44.6	400	DO-214AC, SMA	Active	ROHS3 Compliant
PTVS5V0S1UR,115	Nexperia USA Inc.	5	9.2	44.6	400	SOD-123W	Active	ROHS3 Compliant
SM4T6V7AY	STMicroelectronics	5	13.4	174 (8/20µs)	400	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6F5.0A-M3/6A	Vishay General Semiconductor - Diodes Division	5	13.4	298 (8/20µs)	4000	DO-221AC, SMA Flat Leads	Active	ROHS3 Compliant
SMA6J5.0A-E3/5A	Vishay General Semiconductor - Diodes Division	5	13.4	298 (8/20µs)	4000	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6J5.0A-E3/61	Vishay General Semiconductor - Diodes Division	5	13.4	298 (8/20µs)	600	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6J5.0A-M3/61	Vishay General Semiconductor - Diodes Division	5	13.4	298 (8/20µs)	4000	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6J5.0A-TR	STMicroelectronics	5	13.4	298 (8/20µs)	600	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ5.0A-13-F	Diodes Incorporated	5	9.2	44.6	400	DO-214AC, SMA	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

SMAJ5.0A (MDD) and SMAJ5.0A-13-F (Diodes Incorporated) are direct electrical equivalents to the 1SMA5.0AT3. Both maintain the 5V reverse standoff, 9.2V clamping voltage, and 44.6A peak pulse current in the DO-214AC (SMA) package. Both are active products with ROHS3 compliance, making them suitable for new designs and production continuity.

For Enhanced Transient Protection (Higher Performance):

Parts with 13.4V clamping voltage and higher peak current ratings (SMA6J5.0A series from Vishay, SMA6J5.0A-TR from STMicroelectronics, and SM4T6V7AY from STMicroelectronics) provide superior transient suppression while maintaining the 5V reverse standoff voltage. These are appropriate when circuit design allows for higher clamping voltages or when enhanced protection margins are required.

For Alternative Package Requirements:

PTVS5V0S1UR,115 (Nexperia USA Inc.) offers identical electrical specifications in the SOD-123W package, suitable for space-constrained applications. SMA6F5.0A-M3/6A (Vishay) provides enhanced performance in the DO-221AC (SlimSMA) package with 4000W peak pulse power.

Compliance Considerations:

All active substitute parts listed are ROHS3 compliant, addressing the non-compliance status of the obsolete 1SMA5.0AT3. Nexperia PTVS5V0S1UR,115 and STMicroelectronics SM4T6V7AY carry AEC-Q101 automotive qualification, suitable for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can SMAJ5.0A directly replace 1SMA5.0AT3 without circuit modification?

A: Yes. SMAJ5.0A maintains identical electrical parameters: 5V reverse standoff, 9.2V clamping voltage, 44.6A peak pulse current, and 400W peak pulse power. The DO-214AC (SMA) package is mechanically compatible. No circuit redesign is required.

Q: What is the difference between parts with 9.2V and 13.4V clamping voltages?

A: The 9.2V clamping voltage (1SMA5.0AT3, SMAJ5.0A, SMAJ5.0A-13-F) provides tighter voltage regulation during transient events. The 13.4V clamping voltage (SMA6J5.0A series, SM4T6V7AY) allows higher voltage transients before clamping, suitable for applications requiring higher protection thresholds or when circuit design permits.

Q: Are there package alternatives to DO-214AC (SMA)?

A: Yes. PTVS5V0S1UR,115 is available in SOD-123W package with identical 9.2V clamping and 44.6A peak current. SMA6F5.0A-M3/6A is available in DO-221AC (SlimSMA) package with enhanced 13.4V clamping and 298A peak current. Package selection depends on PCB layout constraints and thermal requirements.

Q: Which substitute part is recommended for new designs?

A: SMAJ5.0A (MDD) or SMAJ5.0A-13-F (Diodes Incorporated) are recommended for direct replacement. Both are active products with ROHS3 compliance and identical electrical specifications. For automotive applications, PTVS5V0S1UR,115 (Nexperia, AEC-Q101 qualified) or SM4T6V7AY (STMicroelectronics, AEC-Q101 qualified) are appropriate.

Q: What does RoHS3 compliance mean for this component?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All active substitute parts listed are ROHS3 compliant, addressing environmental and regulatory requirements for modern electronics manufacturing.

Q: Can higher peak current rated parts (298A) be used in place of 44.6A rated parts?

A: Yes, if the clamping voltage is acceptable for the circuit. Higher peak current ratings provide additional transient suppression margin. However, verify that the 13.4V clamping voltage does not exceed circuit protection requirements. Consult circuit design specifications before substitution.

Q: What is the significance of different peak pulse power ratings (400W vs. 4000W)?

A: Peak pulse power rating indicates the maximum energy the diode can dissipate during a transient event. Higher ratings (4000W) provide greater thermal margin and are suitable for high-energy transient environments. For general-purpose applications, 400W is typically sufficient; higher ratings offer design margin and reliability enhancement.

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