SMBJ8.5C-E3/5B Equivalent & Substitute Parts

Part Overview

The SMBJ8.5C-E3/5B is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This component features an 8.5V reverse standoff voltage, 15.9V maximum clamping voltage, and 37.7A peak pulse current capability in a DO-214AA (SMB) package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	8.5V
Breakdown Voltage (Min)	9.44V
Clamping Voltage (Max) @ Ipp	15.9V
Peak Pulse Current (10/1000µs)	37.7A
Peak Pulse Power	600W
Package / Case	DO-214AA, SMB
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SMBJ8.5C-E3/5B is determined by the following critical electrical and mechanical parameters:

Reverse Standoff Voltage: Must be 8.5V (±tolerance as specified by manufacturer)
Package / Case: Must be DO-214AA or SMB equivalent
Mounting Type: Surface mount only
Peak Pulse Power: 600W minimum
Operating Temperature Range: Minimum -55°C to 150°C
Bidirectional Channels: Single channel (1)
Type: Zener diode

Substitute parts are grouped into two categories based on clamping voltage performance:

Group A (Matched Clamping Voltage 14.4V - 15.9V): Parts with clamping voltages within the operational range of the original component, suitable for direct replacement in most applications.

Group B (Higher Clamping Voltage 18.6V - 19.5V): Parts with elevated clamping voltages, suitable only for applications where higher transient voltage suppression is acceptable.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Package	Status
SMBJ8.5C-E3/5B	Vishay	8.5	9.44	15.9	37.7	DO-214AA (SMBJ)	Obsolete
SMBJ8.5CA-E3/5B	Vishay	8.5	9.44	14.4	41.7	DO-214AA (SMBJ)	Active
SMBJ8.5CE3/TR13	Microchip Technology	8.5	9.44	15.9	37.7	SMBJ (DO-214AA)	Active
P6SMB10CA	Eaton - Electronics Division	8.55	9.5	14.5	42.1	SMB (DO-214AA)	Active
SM6T10CA	STMicroelectronics	8.55	9.5	18.6	215 (8/20µs)	SMB (DO-214AA)	Active
SM6T10CAY	STMicroelectronics	8.55	9.5	18.6	215 (8/20µs)	SMB (DO-214AA)	Active
SMBJ8.5CA	EVVO Semi	8.5	9.44	14.4	41.7	SMB (DO-214AA)	Active
SMBJ8.5CA-13-F	Diodes Incorporated	8.5	9.44	14.4	41.7	SMB (DO-214AA)	Active
SMBJ8.5CA-TR	STMicroelectronics	8.5	9.4	19.5	41.7	SMB (DO-214AA)	Active
SMBJ8.5CAE3/TR13	Microchip Technology	8.5	9.44	14.4	41.7	SMBJ (DO-214AA)	Active
SMBJ8V5CA	Fairchild Semiconductor	8.5	9.44	14.4	41.7	DO-214AA (SMB)	Active

Engineering Selection Recommendations

Primary Substitutes (Matched Performance)

SMBJ8.5CE3/TR13 (Microchip Technology) provides the closest electrical match with identical clamping voltage (15.9V) and peak pulse current (37.7A). This part is active and ROHS3 compliant, making it the preferred direct replacement for the obsolete SMBJ8.5C-E3/5B.

SMBJ8.5CA-E3/5B (Vishay) offers an active alternative from the original manufacturer with slightly lower clamping voltage (14.4V) but higher peak pulse current (41.7A). Both parts share the same base product number (SMBJ8.5) and are ROHS3 compliant.

Secondary Substitutes (Acceptable Alternatives)

SMBJ8.5CA-13-F (Diodes Incorporated), SMBJ8.5CA (EVVO Semi), and SMBJ8.5CAE3/TR13 (Microchip Technology) all feature 8.5V reverse standoff voltage, 14.4V clamping voltage, and 41.7A peak pulse current. These parts are active, ROHS3 compliant, and suitable for applications tolerating the lower clamping voltage specification.

P6SMB10CA (Eaton - Electronics Division) is manufacturer-recommended with 8.55V reverse standoff voltage and 14.5V clamping voltage. This part is ROHS compliant and active, with high inventory availability.

Alternative Consideration (Higher Clamping Voltage)

SM6T10CA and SM6T10CAY (STMicroelectronics) feature significantly higher clamping voltage (18.6V) and peak pulse current (215A at 8/20µs). These parts are suitable only for applications where elevated transient suppression is required. SM6T10CAY includes AEC-Q101 automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can SMBJ8.5CA-E3/5B be used as a direct replacement for SMBJ8.5C-E3/5B?

A: Yes. Both parts share the same reverse standoff voltage (8.5V), package (DO-214AA/SMBJ), and operating temperature range. The SMBJ8.5CA-E3/5B has lower clamping voltage (14.4V vs. 15.9V) but higher peak pulse current (41.7A vs. 37.7A), making it suitable for the same applications.

Q: What is the difference between SMBJ8.5CE3/TR13 and SMBJ8.5CAE3/TR13?

A: SMBJ8.5CE3/TR13 has 15.9V clamping voltage and 37.7A peak pulse current. SMBJ8.5CAE3/TR13 has 14.4V clamping voltage and 41.7A peak pulse current. Both are manufactured by Microchip Technology and are electrically compatible substitutes with different transient suppression characteristics.

Q: Are SM6T10CA and SM6T10CAY interchangeable?

A: Both parts have identical electrical specifications (8.55V standoff, 18.6V clamping, 215A peak pulse current) and package (SMB DO-214AA). SM6T10CAY includes AEC-Q101 automotive qualification. Selection depends on application requirements and qualification standards.

Q: What packaging options are available for these substitutes?

A: All substitute parts use DO-214AA or SMB surface-mount packages. Packaging variants include Tape & Reel (TR), Cut Tape (CT), Digi-Reel, and Bulk. Verify packaging compatibility with your procurement and assembly processes.

Q: Is the SMBJ8.5C-E3/5B still available?

A: The SMBJ8.5C-E3/5B is listed as obsolete. Active substitutes from multiple manufacturers are available with comparable or enhanced electrical performance and full RoHS compliance.

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