1SMB6.5AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB6.5AT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This unidirectional Zener diode features a 6.5V reverse standoff voltage with an 11.2V maximum clamping voltage and 53.6A peak pulse current capability in the DO-214AA (SMB) package. The part is currently obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMB6.5AT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	6.5V
Voltage - Breakdown (Min)	7.22V
Voltage - Clamping (Max) @ Ipp	11.2V
Current - Peak Pulse (10/1000µs)	53.6A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 1SMB6.5AT3 are qualified based on the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 6.5V (identical)
Voltage - Clamping (Max) @ Ipp: 11.2V (identical)
Current - Peak Pulse (10/1000µs): 53.6A to 56A (within tolerance)
Power - Peak Pulse: 600W (identical)
Package / Case: DO-214AA or SMB (identical or equivalent)
Mounting Type: Surface Mount (identical)
Unidirectional Channels: 1 (identical)
Type: Zener (identical)

Substitutes are categorized as direct equivalents when all electrical parameters match within specified tolerances and the package is identical. Similar parts maintain the same voltage and power ratings but may originate from different manufacturers or have minor variations in peak pulse current (56A vs. 53.6A) or operating temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package	Operating Temperature	Product Status	RoHS Status
1SMB6.5AT3	onsemi	6.5V	11.2V	53.6A	600W	DO-214AA, SMB	-65°C ~ 150°C	Obsolete	RoHS non-compliant
SMBJ6.5A	Taiwan Semiconductor Corporation	6.5V	11.2V	56A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ6.5A/54	Vishay General Semiconductor - Diodes Division	6.5V	11.2V	53.6A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	RoHS non-compliant
PTVS6V5P1UP,115	NXP USA Inc.	6.5V	11.2V	53.6A	600W	SOD-128	-55°C ~ 150°C	Active	Not specified
SMBJ6.5A-13-F	Diodes Incorporated	6.5V	11.2V	53.6A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ6.5A-HRA	Littelfuse Inc.	6.5V	11.2V	53.6A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ6.5A-TR	STMicroelectronics	6.5V	11.2V	56A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ6.5AE3/TR13	Microchip Technology	6.5V	11.2V	53.6A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ6V5A	Taiwan Semiconductor Corporation	6.5V	11.2V	53.6A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring the 1SMB6.5AT3, the following selection criteria apply:

Direct Package Equivalents (DO-214AA/SMB): SMBJ6.5A, SMBJ6.5A/54, SMBJ6.5A-13-F, SMBJ6.5A-HRA, SMBJ6.5A-TR, SMBJ6.5AE3/TR13, and SMBJ6V5A all maintain identical package geometry and electrical specifications within tolerance. These parts are suitable for direct PCB replacement.

RoHS3 Compliance: SMBJ6.5A, SMBJ6.5A-13-F, SMBJ6.5A-HRA, SMBJ6.5A-TR, SMBJ6.5AE3/TR13, and SMBJ6V5A are RoHS3 compliant. SMBJ6.5A/54 and the original 1SMB6.5AT3 are RoHS non-compliant.

Temperature Range: SMBJ6.5A-HRA and SMBJ6.5AE3/TR13 support the full -65°C to 150°C operating range matching the original part. Other active substitutes operate from -55°C to 150°C.

Peak Pulse Current: SMBJ6.5A and SMBJ6.5A-TR specify 56A peak pulse current, compared to 53.6A for the original part. This represents a 4.5% increase and remains within acceptable tolerance for general-purpose TVS applications.

Alternative Package: PTVS6V5P1UP,115 from NXP maintains identical electrical specifications but uses SOD-128 package geometry, requiring PCB layout modification. This part includes AEC-Q101 automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can SMBJ6.5A directly replace 1SMB6.5AT3 on existing PCBs?

A: Yes. SMBJ6.5A maintains identical voltage ratings (6.5V reverse standoff, 11.2V clamping), equivalent peak pulse current (56A vs. 53.6A), and identical DO-214AA/SMB package footprint. The part is RoHS3 compliant and in active production status.

Q: What is the difference between 53.6A and 56A peak pulse current specifications?

A: Both values fall within the same performance envelope for general-purpose TVS applications. The 56A specification represents a 4.5% increase in peak pulse current capability and does not affect circuit compatibility when the original design was based on 53.6A.

Q: Why does PTVS6V5P1UP,115 have a different package (SOD-128)?

A: PTVS6V5P1UP,115 is a similar electrical equivalent but uses SOD-128 package geometry instead of DO-214AA/SMB. This requires PCB layout redesign and cannot be used as a direct footprint replacement. Selection of this part is appropriate only when PCB modification is feasible.

Q: Which substitute offers the widest operating temperature range?

A: SMBJ6.5A-HRA and SMBJ6.5AE3/TR13 both support -65°C to 150°C, matching the original 1SMB6.5AT3 specification. Other active substitutes operate from -55°C to 150°C.

Q: Are all substitute parts RoHS compliant?

A: No. SMBJ6.5A/54 and the original 1SMB6.5AT3 are RoHS non-compliant. SMBJ6.5A, SMBJ6.5A-13-F, SMBJ6.5A-HRA, SMBJ6.5A-TR, SMBJ6.5AE3/TR13, and SMBJ6V5A are RoHS3 compliant.

Q: What is the inventory status of substitute parts?

A: SMBJ6.5A (Taiwan Semiconductor Corporation) has the highest inventory at 17,957 pieces. SMBJ6.5A-TR (STMicroelectronics) has 10,400 pieces. SMBJ6V5A has 6,100 pieces. All listed substitutes are in active production and available in quantity.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message