SMBJ8.5CA-13 Equivalent & Substitute Parts

Part Overview

The SMBJ8.5CA-13 is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with an 8.5V reverse standoff voltage and provides 14.4V maximum clamping voltage at peak pulse current of 41.7A, delivering 600W peak pulse power dissipation in a DO-214AA (SMB) package.

The SMBJ8.5CA-13 is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers with identical or comparable electrical characteristics, ensuring design continuity and supply chain flexibility.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	8.5	V
Voltage - Breakdown (Min)	9.44	V
Voltage - Clamping (Max) @ Ipp	14.4	V
Current - Peak Pulse (10/1000µs)	41.7	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMBJ8.5CA-13 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 8.5V or within 0.05V tolerance (8.5V ± 0.05V acceptable)
Voltage - Clamping (Max) @ Ipp: Must not exceed 14.5V to ensure equivalent protection performance
Current - Peak Pulse (10/1000µs): Must be ≥41.7A for equivalent or superior transient handling
Power - Peak Pulse: Must be 600W minimum
Package / Case: Must be DO-214AA (SMB) for mechanical and thermal compatibility
Mounting Type: Must be Surface Mount
Type: Must be Zener diode
Bidirectional Channels: Must be 1

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents: Parts with identical reverse standoff voltage (8.5V) and clamping voltage (14.4V), differing only in manufacturer, packaging format, or RoHS compliance status.

Category B - Functional Equivalents: Parts with slightly higher reverse standoff voltage (8.55V) and marginally higher clamping voltage (14.5V), maintaining electrical performance within acceptable design tolerances for general-purpose TVS applications.

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ) [V]	Vbr (Min) [V]	Vc (Max) [V]	Ipp [A]	Ppk [W]	Tj Range [°C]	Package	Status	RoHS
SMBJ8.5CA-13	Diodes Incorporated	8.5	9.44	14.4	41.7	600	-55 to 150	DO-214AA, SMB	Discontinued	Non-compliant
SMBJ8.5CA-13-F	Diodes Incorporated	8.5	9.44	14.4	41.7	600	-55 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ8.5CA-TP	Micro Commercial Co	8.5	9.44	14.4	41.7	600	-55 to 175	DO-214AA, SMB	Active	ROHS3 Compliant
P6SMB10CA	Eaton - Electronics Division	8.55	9.5	14.5	42.1	600	-55 to 150	DO-214AA, SMB	Active	RoHS Compliant
SM6T10CA	STMicroelectronics	8.55	9.5	18.6	215 (8/20µs)	600	-55 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
SM6T10CAY	STMicroelectronics	8.55	9.5	18.6	215 (8/20µs)	600	-55 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ8.5CA	EVVO Semi	8.5	9.44	14.4	41.7	600	-65 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ8.5CA-TR	STMicroelectronics	8.5	9.4	19.5	41.7	600	-55 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJP6KE10CA-TP	Micro Commercial Co	8.55	9.5	14.5	42.1	600	-55 to 175	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement:

SMBJ8.5CA-13-F (Diodes Incorporated) is the direct successor to the discontinued SMBJ8.5CA-13. It maintains identical electrical specifications and package format while achieving ROHS3 compliance. This part is recommended for new designs and as the first-choice replacement for existing applications.

Secondary Recommendations - Equivalent Performance:

SMBJ8.5CA-TP (Micro Commercial Co) and SMBJ8.5CA (EVVO Semi) provide identical electrical performance with extended operating temperature ranges (-55 to 175°C and -65 to 150°C respectively) and active product status. Both are ROHS3 compliant and suitable for direct substitution.

Functional Equivalents - Higher Performance Margin:

P6SMB10CA (Eaton) and SMBJP6KE10CA-TP (Micro Commercial Co) offer marginally higher reverse standoff voltage (8.55V) and clamping voltage (14.5V) with equivalent peak pulse current (42.1A). These parts provide additional protection margin and are suitable for applications where slightly higher clamping voltage is acceptable.

SM6T10CA and SM6T10CAY (STMicroelectronics) deliver significantly higher peak pulse current (215A at 8/20µs) and clamping voltage (18.6V), providing superior transient suppression capability. SM6T10CAY includes AEC-Q101 automotive qualification. These parts are recommended for high-stress transient environments or automotive applications requiring enhanced protection.

Compliance Considerations:

All recommended substitute parts are ROHS3 compliant or RoHS compliant, addressing environmental and regulatory requirements. The original SMBJ8.5CA-13 is RoHS non-compliant; migration to compliant alternatives is recommended for new designs and long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can SMBJ8.5CA-13-F be used as a direct drop-in replacement for SMBJ8.5CA-13?

A: Yes. SMBJ8.5CA-13-F is electrically and mechanically identical to SMBJ8.5CA-13, differing only in RoHS compliance status and packaging format (Tape & Reel). It is a direct replacement suitable for PCB assembly without design modification.

Q: What is the difference between Category A and Category B substitutes?

A: Category A substitutes (SMBJ8.5CA-13-F, SMBJ8.5CA-TP, SMBJ8.5CA) maintain the exact 8.5V reverse standoff voltage and 14.4V clamping voltage of the original part. Category B substitutes (P6SMB10CA, SMBJP6KE10CA-TP) have 8.55V reverse standoff and 14.5V clamping voltage, providing marginally higher protection but remaining within acceptable design tolerances for general-purpose applications.

Q: Are SM6T10CA and SM6T10CAY suitable replacements for general-purpose applications?

A: SM6T10CA and SM6T10CAY are functionally compatible but deliver higher peak pulse current (215A) and clamping voltage (18.6V). They are suitable for applications requiring enhanced transient suppression or high-stress environments. For standard general-purpose applications, Category A or Category B substitutes are more cost-effective.

Q: What is the significance of the "-TR" and "-TP" packaging designations?

A: "-TR" indicates Tape & Reel packaging for automated assembly. "-TP" also indicates Tape & Reel packaging. Both formats are suitable for high-volume PCB manufacturing. Cut Tape (CT) and Digi-Reel formats are available for lower-volume applications. All formats maintain identical electrical performance.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not affect electrical substitution compatibility for most applications. SMBJ8.5CA-TP (-55 to 175°C) and SMBJ8.5CA (-65 to 150°C) offer extended ranges compared to the original part (-55 to 150°C), providing additional design margin in temperature-sensitive applications. Standard-range parts (-55 to 150°C) are suitable for typical industrial and commercial environments.

Q: Is RoHS compliance mandatory for substitution?

A: RoHS compliance is not mandatory for electrical substitution but is increasingly required by regulatory standards and customer specifications. All recommended substitutes are ROHS3 or RoHS compliant, ensuring compliance with current environmental regulations. The original SMBJ8.5CA-13 is RoHS non-compliant and should be replaced in new designs.

Q: Can multiple substitute parts be used interchangeably in the same design?

A: Yes, within the constraints of the application. Category A substitutes are fully interchangeable. Category B substitutes are interchangeable for applications tolerating 8.55V reverse standoff and 14.5V clamping voltage. SM6T10CA and SM6T10CAY are interchangeable with each other but should be evaluated for applications where higher clamping voltage (18.6V) is acceptable.

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