SMB8J8.5C-E3/5B Equivalent & Substitute Parts

Part Overview

The SMB8J8.5C-E3/5B is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This surface mount component operates in the DO-214AA (SMB) package and provides bidirectional overvoltage protection with an 8.5V reverse standoff voltage and 15.9V maximum clamping voltage at peak pulse current.

The SMB8J8.5C-E3/5B is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring 8.5V class TVS protection.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	8.5V
Voltage - Breakdown (Min)	9.44V
Voltage - Clamping (Max) @ Ipp	15.9V
Current - Peak Pulse (10/1000µs)	50.3A
Power - Peak Pulse	800W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Type	Zener
Bidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SMB8J8.5C-E3/5B is determined by the following critical parameters:

Voltage - Reverse Standoff: 8.5V (±tolerance)
Voltage - Breakdown (Min): 9.44V minimum
Package / Case: DO-214AA, SMB (surface mount compatibility)
Mounting Type: Surface Mount
Bidirectional Channels: 1
Operating Temperature Range: -55°C to 150°C minimum
Type: Zener diode

Substitute parts must maintain the same reverse standoff voltage class and package footprint to ensure direct PCB compatibility and equivalent overvoltage protection performance. Variations in clamping voltage and peak pulse current are acceptable within the 8.5V class specification, provided the component meets the minimum breakdown voltage threshold and operates within the specified temperature range.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status
SMB8J8.5C-E3/5B	Vishay	8.5V	9.44V	15.9V	50.3A	800W	DO-214AA, SMB	-55°C ~ 150°C	Obsolete
SMB8J8.5CA-E3/5B	Vishay	8.5V	9.44V	14.4V	55.6A	800W	DO-214AA, SMB	-55°C ~ 150°C	Active
P6SMB10CA	Eaton	8.55V	9.5V	14.5V	42.1A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active
SM6T10CA	STMicroelectronics	8.55V	9.5V	18.6V	215A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	Active
SM6T10CAY	STMicroelectronics	8.55V	9.5V	18.6V	215A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	Active
SMBJ8.5CA	EVVO Semi	8.5V	9.44V	14.4V	41.7A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active
SMBJ8.5CA-TR	STMicroelectronics	8.5V	9.4V	19.5V	41.7A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active
SMBJ8.5CAE3/TR13	Microchip Technology	8.5V	9.44V	14.4V	41.7A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active
SMBJ8.5CE3/TR13	Microchip Technology	8.5V	9.44V	15.9V	37.7A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active
SMBJ8V5CA	Fairchild Semiconductor	8.5V	9.44V	14.4V	41.7A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active

Engineering Selection Recommendations

Primary Substitute: SMB8J8.5CA-E3/5B

The SMB8J8.5CA-E3/5B is the direct Vishay equivalent with active product status. It maintains identical reverse standoff voltage (8.5V), breakdown voltage (9.44V), and package specifications. The clamping voltage is 14.4V versus the original 15.9V, and peak pulse current is 55.6A versus 50.3A. Both parameters remain within acceptable tolerance for 8.5V class TVS applications. This part carries ROHS3 compliance and unlimited moisture sensitivity rating.

Secondary Substitutes: SMBJ8.5CAE3/TR13 and SMBJ8.5CE3/TR13

Microchip Technology parts offer active status with extended operating temperature range (-65°C to 150°C). The SMBJ8.5CAE3/TR13 provides 14.4V clamping voltage and 41.7A peak pulse current. The SMBJ8.5CE3/TR13 matches the original 15.9V clamping voltage with 37.7A peak pulse current. Both are ROHS3 compliant and suitable for general purpose applications.

Alternative Substitutes: SMBJ8.5CA (EVVO Semi) and SMBJ8V5CA (Fairchild Semiconductor)

These parts maintain 8.5V reverse standoff voltage and 14.4V clamping voltage with 41.7A peak pulse current. Both offer active product status and ROHS3 compliance. SMBJ8.5CA extends the operating temperature to -65°C. SMBJ8V5CA maintains the -55°C to 150°C range.

Cross-Manufacturer Options: P6SMB10CA (Eaton) and SM6T10CA / SM6T10CAY (STMicroelectronics)

These parts operate at 8.55V reverse standoff voltage with 9.5V minimum breakdown voltage, maintaining compatibility with the 8.5V class specification. The Eaton P6SMB10CA provides 14.5V clamping voltage and 42.1A peak pulse current. The STMicroelectronics SM6T10CA and SM6T10CAY offer higher peak pulse current (215A at 8/20µs) and 18.6V clamping voltage, suitable for applications requiring enhanced transient suppression. SM6T10CAY includes AEC-Q101 automotive qualification.

All recommended substitutes maintain DO-214AA (SMB) package compatibility, surface mount configuration, and operating temperature ranges suitable for the original application.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different clamping voltage?

A: Yes, provided the substitute maintains the same 8.5V reverse standoff voltage class and the clamping voltage remains within the acceptable range for your circuit protection requirements. The original part specifies 15.9V maximum clamping; substitutes with 14.4V to 19.5V clamping voltage are functionally equivalent for 8.5V class protection.

Q: Are all substitute parts compatible with the original PCB footprint?

A: Yes. All listed substitutes use the DO-214AA (SMB) package, which maintains identical footprint and pin configuration. Direct PCB replacement is possible without layout modifications.

Q: What is the difference between parts with different peak pulse currents?

A: Peak pulse current (Ipp) indicates the maximum transient current the diode can suppress. The original SMB8J8.5C-E3/5B handles 50.3A at 10/1000µs pulse width. Substitutes range from 37.7A to 215A depending on the series. Higher Ipp ratings provide greater transient suppression capability; lower ratings remain suitable if your circuit transients do not exceed the specified current.

Q: Why do some substitutes have different operating temperature ranges?

A: Operating temperature range depends on the manufacturer's design and qualification. The original part specifies -55°C to 150°C. Some substitutes extend to -65°C minimum, providing wider temperature coverage. Verify your application requirements before selecting a part with a narrower or wider range.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive, restricting lead, cadmium, mercury, and other hazardous materials. All listed substitutes carry ROHS3 compliance, ensuring environmental and regulatory conformance.

Q: Can I use SM6T10CA or SM6T10CAY as direct replacements?

A: Yes, with consideration for higher performance. These STMicroelectronics parts operate at 8.55V reverse standoff voltage with 215A peak pulse current (8/20µs pulse width), compared to the original 50.3A (10/1000µs). The higher current rating provides enhanced transient suppression. They are functionally compatible but represent an upgrade in protection capability.

Q: What is the significance of the packaging designation (Tape & Reel vs. Bulk)?

A: Packaging affects supply format and handling. Tape & Reel (TR) packaging is standard for automated assembly lines. Bulk packaging is used for manual assembly or lower-volume applications. Electrical performance is identical; selection depends on your manufacturing process requirements.

Q: Is the Microchip SMBJ8.5CE3/TR13 a better choice than SMBJ8.5CAE3/TR13?

A: Both are equivalent substitutes. The SMBJ8.5CE3/TR13 matches the original 15.9V clamping voltage but provides lower peak pulse current (37.7A). The SMBJ8.5CAE3/TR13 provides higher peak pulse current (41.7A) with 14.4V clamping voltage. Select based on your specific clamping voltage and current requirements.

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