SMBJ8.5CA Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ8.5CA is a bidirectional Zener transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device operates with an 8.5V reverse standoff voltage and provides 14.4V maximum clamping voltage at peak pulse current of 41.7A. This component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified when manufacturers discontinue production, when alternative sourcing is required for supply chain optimization, or when design flexibility permits selection from multiple qualified suppliers offering identical or functionally compatible electrical characteristics within the same package family.

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	-65 to 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

Substitute parts for the SMBJ8.5CA are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Voltage - Reverse Standoff (Typ): 8.5V ± tolerance
Voltage - Clamping (Max) @ Ipp: 14.4V nominal range
Current - Peak Pulse (10/1000µs): 41.7A nominal
Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount
Type: Zener, Bidirectional
RoHS Status: ROHS3 Compliant

Substitutes are classified into two categories:

Direct Electrical Equivalents: Parts with identical or near-identical voltage and current ratings, differing only in manufacturer designation or packaging variant (tape & reel vs. cut tape).

Functional Equivalents with Parameter Variance: Parts with the same reverse standoff voltage but differing clamping voltage or peak pulse current specifications. These are suitable only when the application circuit tolerates the specified parameter differences.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ) [V]	Voltage - Clamping (Max) @ Ipp [V]	Current - Peak Pulse (10/1000µs) [A]	Operating Temperature [°C]	Package / Case	RoHS Status
SMBJ8.5CA	Littelfuse Inc.	8.5	14.4	41.7	-65 to 150	DO-214AA, SMB	ROHS3 Compliant
SMBJ8.5CA-13-F	Diodes Incorporated	8.5	14.4	41.7	-55 to 150	DO-214AA, SMB	ROHS3 Compliant
SMBJ8.5CA-E3/52	Vishay General Semiconductor - Diodes Division	8.5	14.4	41.7	-55 to 150	DO-214AA, SMB	ROHS3 Compliant
SMBJ8.5CA-TP	Micro Commercial Co	8.5	14.4	41.7	-55 to 175	DO-214AA, SMB	ROHS3 Compliant
SM6T10CA	STMicroelectronics	8.55	18.6	215 (8/20µs)	-55 to 150	DO-214AA, SMB	ROHS3 Compliant
SM6T10CA-E3/52	Vishay General Semiconductor - Diodes Division	8.55	14.5	41	-65 to 150	DO-214AA, SMB	ROHS3 Compliant
SM6T10CAY	STMicroelectronics	8.55	18.6	215 (8/20µs)	-55 to 150	DO-214AA, SMB	ROHS3 Compliant
SMBJ8.5CA	EVVO Semi	8.5	14.4	41.7	-65 to 150	DO-214AA, SMB	ROHS3 Compliant
SMBJ8.5CA-TR	STMicroelectronics	8.5	19.5	41.7	-55 to 150	DO-214AA, SMB	ROHS3 Compliant
SMBJE8-5CA	Eaton - Electronics Division	8.5	14.4	4.4	-55 to 150	DO-214AA, SMB	RoHS Compliant
SMBJP6KE10CA-TP	Micro Commercial Co	8.55	14.5	42.1	-55 to 175	DO-214AA, SMB	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical Performance):

SMBJ8.5CA-13-F (Diodes Incorporated), SMBJ8.5CA-E3/52 (Vishay), SMBJ8.5CA-TP (Micro Commercial Co), and SMBJ8.5CA (EVVO Semi) are direct electrical equivalents with matching 8.5V reverse standoff, 14.4V clamping voltage, and 41.7A peak pulse current. All are RoHS3 compliant and surface-mount compatible in DO-214AA/SMB packages. Selection among these is determined by packaging format (tape & reel vs. cut tape), operating temperature range requirements, and supplier availability.

Functional Equivalents with Parameter Tolerance:

SM6T10CA-E3/52 (Vishay) and SMBJP6KE10CA-TP (Micro Commercial Co) maintain the 8.5V reverse standoff specification with clamping voltages of 14.5V and 14.5V respectively, and peak pulse currents of 41A and 42.1A. These parts are suitable for applications where ±0.1V clamping voltage variation and ±1A peak pulse current variation are within circuit tolerance margins.

Not Recommended for Direct Substitution:

SM6T10CA and SM6T10CAY (STMicroelectronics) exhibit significantly higher clamping voltage (18.6V) and peak pulse current (215A at 8/20µs pulse width), representing a different device class. SMBJE8-5CA (Eaton) has substantially reduced peak pulse current (4.4A), unsuitable for applications requiring 41.7A transient suppression. SMBJ8.5CA-TR (STMicroelectronics) has elevated clamping voltage (19.5V), acceptable only in circuits with higher voltage tolerance.

All recommended substitutes maintain RoHS3 compliance, active product status, and surface-mount DO-214AA/SMB package compatibility with the original SMBJ8.5CA.

Frequently Asked Questions (FAQ)

Q: Can SMBJ8.5CA-13-F replace SMBJ8.5CA in all applications?

A: Yes, SMBJ8.5CA-13-F is a direct electrical equivalent with identical voltage and current ratings. The only difference is the lower operating temperature minimum (-55°C vs. -65°C). If your application operates above -55°C, this part is fully interchangeable.

Q: What is the difference between SMBJ8.5CA-E3/52 and SMBJ8.5CA-TP?

A: Both are direct electrical equivalents with identical electrical specifications. SMBJ8.5CA-E3/52 is supplied in tape & reel packaging by Vishay, while SMBJ8.5CA-TP is supplied in tape & reel by Micro Commercial Co. SMBJ8.5CA-TP supports a higher maximum operating temperature (175°C vs. 150°C). Selection depends on packaging preference and temperature requirements.

Q: Why are SM6T10CA and SM6T10CAY listed as substitutes if they have different electrical ratings?

A: These parts are listed as manufacturer-recommended alternatives in the original part documentation. However, their significantly higher clamping voltage (18.6V) and peak pulse current (215A) represent a different protection class. They should only be selected if circuit design permits higher clamping voltage without component damage.

Q: Is SMBJE8-5CA suitable as a substitute?

A: SMBJE8-5CA maintains the same reverse standoff voltage and clamping voltage but has substantially reduced peak pulse current (4.4A vs. 41.7A). This part is unsuitable for applications requiring full 41.7A transient suppression and should not be used as a direct replacement.

Q: What does RoHS3 compliance mean for this component?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All recommended substitutes are RoHS3 compliant, ensuring regulatory compatibility with modern electronics manufacturing standards.

Q: Can I use SMBJP6KE10CA-TP if my circuit requires exactly 41.7A peak pulse current?

A: SMBJP6KE10CA-TP provides 42.1A peak pulse current, a 0.4A difference. For applications with tight current specifications, verify that this ±0.4A tolerance is acceptable. The clamping voltage is also 14.5V (0.1V higher than the original 14.4V), which should be evaluated against circuit voltage limits.

Q: What packaging options are available for SMBJ8.5CA substitutes?

A: All listed substitutes use DO-214AA or SMB package designations, which are mechanically and electrically identical. Packaging format differs between tape & reel (TR) and cut tape (CT) options, affecting handling and assembly processes but not component performance.

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