SMBJ6.5 Transient Voltage Suppressor (TVS) Diode – Equivalent & Substitute Parts

Part Overview

The SMBJ6.5 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 6.5V reverse standoff voltage, 11.76V maximum clamping voltage, and 53.6A peak pulse current capability in a DO-214AA (SMB) package. The original part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage – Reverse Standoff (Typ)	6.5	V
Voltage – Breakdown (Min)	6.84	V
Voltage – Clamping (Max) @ Ipp	11.76	V
Current – Peak Pulse (10/1000µs)	53.6	A
Power – Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMBJ6.5 is determined by strict alignment of the following electrical and mechanical parameters:

Voltage – Reverse Standoff: 6.5V (exact match required)
Voltage – Clamping (Max) @ Ipp: 11.2V to 11.76V (acceptable range for functional equivalence)
Current – Peak Pulse (10/1000µs): 53.6A minimum (equal or greater acceptable)
Package / Case: DO-214AA or SMB (mechanical compatibility)
Mounting Type: Surface Mount (PCB assembly compatibility)
RoHS Status: ROHS3 Compliant (regulatory requirement)
Moisture Sensitivity Level: 1 (Unlimited) (handling and storage compatibility)

Substitute parts are grouped into two categories based on peak pulse current capability: standard current devices (53.6A to 56A) and enhanced current devices (89.3A). All listed substitutes maintain the 6.5V standoff voltage and 11.2V clamping voltage specification, ensuring direct functional replacement in circuit protection applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage – Reverse Standoff (V)	Voltage – Clamping (Max) @ Ipp (V)	Current – Peak Pulse (A)	Power – Peak Pulse (W)	Operating Temperature (°C)	Package / Case	Product Status
SMBJ6.5	Littelfuse Inc.	6.5	11.76	53.6	600	-65 to 150	DO-214AA, SMB	Obsolete
SMBJ6.5A	Taiwan Semiconductor Corporation	6.5	11.2	56	600	-55 to 150	DO-214AA, SMB	Active
SZ1SMB6.5AT3G	Littelfuse Inc.	6.5	11.2	53.6	600	-65 to 150	DO-214AA, SMB	Active
SMB10J6.5A-E3/52	Vishay General Semiconductor – Diodes Division	6.5	11.2	89.3	1000	-55 to 150	DO-214AA, SMB	Active
SMB10J6.5A-E3/5B	Vishay General Semiconductor – Diodes Division	6.5	11.2	89.3	1000	-55 to 150	DO-214AA, SMB	Active
SMBJ6.5A-13-F	Diodes Incorporated	6.5	11.2	53.6	600	-55 to 150	DO-214AA, SMB	Active
SMBJ6.5A-E3/5B	Vishay General Semiconductor – Diodes Division	6.5	11.2	53.6	600	-55 to 150	DO-214AA, SMB	Active
SMBJ6.5A-TR	STMicroelectronics	6.5	11.2	56	600	-55 to 150	DO-214AA, SMB	Active
SMBJ6V5A	Taiwan Semiconductor Corporation	6.5	11.2	53.6	600	-55 to 150	DO-214AA, SMB	Active

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and MSL 1 (Unlimited) rating, ensuring regulatory conformance and handling compatibility with the original SMBJ6.5 specification.

For applications requiring extended low-temperature operation below -55°C, the SZ1SMB6.5AT3G (Littelfuse Inc.) maintains the -65°C to 150°C operating range of the original part and includes AEC-Q101 automotive qualification, making it suitable for automotive and industrial environments.

For standard commercial applications operating within -55°C to 150°C, the SMBJ6.5A (Taiwan Semiconductor Corporation) and SMBJ6.5A-TR (STMicroelectronics) provide equivalent electrical performance with high inventory availability and established supply chain presence.

For applications requiring enhanced transient energy absorption, the SMB10J6.5A-E3/52 and SMB10J6.5A-E3/5B (Vishay General Semiconductor – Diodes Division) offer 89.3A peak pulse current and 1000W peak pulse power, providing additional margin for high-energy transient events while maintaining the 6.5V standoff and 11.2V clamping voltage specification.

Frequently Asked Questions (FAQ)

Q: Can SMBJ6.5A directly replace the obsolete SMBJ6.5?

A: Yes. The SMBJ6.5A maintains the 6.5V reverse standoff voltage, 11.2V clamping voltage, and DO-214AA (SMB) package. The primary difference is the operating temperature range (-55°C to 150°C versus -65°C to 150°C). For applications within -55°C to 150°C, direct substitution is valid.

Q: What is the difference between standard current (53.6A–56A) and enhanced current (89.3A) devices?

A: Standard current devices (SMBJ6.5A, SMBJ6.5A-13-F, SMBJ6.5A-E3/5B, SMBJ6V5A) handle 53.6A to 56A peak pulse current at 600W peak pulse power. Enhanced current devices (SMB10J6.5A-E3/52, SMB10J6.5A-E3/5B) handle 89.3A peak pulse current at 1000W peak pulse power. Enhanced devices provide greater transient energy absorption capability in the same package footprint.

Q: Are all substitute parts available in the same packaging options?

A: All substitute parts are available in DO-214AA (SMB) surface-mount package. Packaging variants (Tape & Reel, Cut Tape, Digi-Reel) differ by supplier but do not affect electrical or mechanical compatibility. Verify packaging availability with your component supplier for production requirements.

Q: Does the SZ1SMB6.5AT3G offer advantages over other substitutes?

A: The SZ1SMB6.5AT3G is manufactured by Littelfuse Inc. (original manufacturer) and maintains the -65°C to 150°C operating range. It includes AEC-Q101 automotive qualification and 2140pF capacitance specification at 1MHz. This part is preferred for automotive, industrial, and extended temperature applications.

Q: Can I use SMB10J6.5A devices in place of standard current devices?

A: Yes. The SMB10J6.5A series (89.3A, 1000W) is a direct functional upgrade. Higher peak pulse current and power ratings provide additional protection margin without affecting circuit operation. Verify that PCB thermal design accommodates the increased power dissipation capability if needed.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status and MSL 1 (Unlimited) moisture sensitivity rating, ensuring regulatory compliance and compatibility with modern manufacturing processes.

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