CD214B-T8.5CALF Equivalent & Substitute Parts

Part Overview

The CD214B-T8.5CALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features an 8.5V reverse standoff voltage with a 14.4V maximum clamping voltage and 41.7A peak pulse current capability in the SMB (DO-214AA) package format. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214B-T8.5CALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Package / Case	DO-214AA, SMB
Voltage - Reverse Standoff (Typ)	8.5V
Voltage - Breakdown (Min)	9.44V
Voltage - Clamping (Max) @ Ipp	14.4V
Current - Peak Pulse (10/1000µs)	41.7A
Power - Peak Pulse	600W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Bidirectional Channels	1
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the CD214B-T8.5CALF is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 8.5V ± tolerance
Voltage - Clamping (Max) @ Ipp: 14.4V ± tolerance
Current - Peak Pulse (10/1000µs): 41.7A ± tolerance
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Bidirectional Channels: 1
Power - Peak Pulse: 600W

Direct Equivalents maintain identical electrical specifications across all critical parameters and represent pin-for-pin replacements with no design modification required.

Similar Substitutes exhibit minor variations in clamping voltage or peak pulse current within acceptable engineering tolerances but maintain the same reverse standoff voltage, package format, and power rating. These parts require verification of circuit performance under transient conditions.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vwm (Typ)	Vc (Max) @ Ipp	Ipp (10/1000µs)	Package	Temp Range	RoHS
CD214B-T8.5CALF	Bourns Inc.	Obsolete	8.5V	14.4V	41.7A	DO-214AA, SMB	-55°C ~ 150°C	ROHS3
SMBJ8.5CA	EVVO Semi	Active	8.5V	14.4V	41.7A	DO-214AA, SMB	-65°C ~ 150°C	ROHS3
SMBJ8.5CA-TP	Micro Commercial Co	Active	8.5V	14.4V	41.7A	DO-214AA, SMB	-55°C ~ 175°C	ROHS3
SMBJ8V5CA	Fairchild Semiconductor	Active	8.5V	14.4V	41.7A	DO-214AA, SMB	-55°C ~ 150°C	Not specified
P6SMB10CA	Eaton - Electronics Division	Active	8.55V	14.5V	42.1A	DO-214AA, SMB	-55°C ~ 150°C	RoHS
SM6T10CA-E3/5B	Vishay General Semiconductor	Active	8.55V	14.5V	41A	DO-214AA, SMB	-65°C ~ 150°C	ROHS3
SM6T10CA	STMicroelectronics	Active	8.55V	18.6V	215A (8/20µs)	DO-214AA, SMB	-55°C ~ 150°C	ROHS3
SM6T10CAY	STMicroelectronics	Active	8.55V	18.6V	215A (8/20µs)	DO-214AA, SMB	-55°C ~ 150°C	ROHS3
SMBJ8.0CA	MDD	Active	8.0V	13.6V	44.2A	DO-214AA, SMB	-50°C ~ 150°C	ROHS3
SMBJ8.5CA-TR	STMicroelectronics	Active	8.5V	19.5V	41.7A	DO-214AA, SMB	-55°C ~ 150°C	ROHS3

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Choices):

SMBJ8.5CA (EVVO Semi) and SMBJ8V5CA (Fairchild Semiconductor) are direct electrical equivalents with identical reverse standoff voltage (8.5V), clamping voltage (14.4V), and peak pulse current (41.7A). Both are active products with ROHS3 compliance. SMBJ8.5CA offers extended lower temperature rating (-65°C) compared to the original specification.

SMBJ8.5CA-TP (Micro Commercial Co) provides identical electrical specifications with extended upper temperature rating to 175°C, suitable for applications requiring enhanced thermal performance.

Similar Substitutes (Acceptable with Circuit Verification):

P6SMB10CA (Eaton) and SM6T10CA-E3/5B (Vishay) exhibit minor parameter variations within acceptable tolerances: reverse standoff voltage of 8.55V (0.05V above specification) and clamping voltage of 14.5V (0.1V above specification). Peak pulse current remains within 1% of the original specification. These parts maintain full ROHS3 compliance and active product status.

SM6T10CA and SM6T10CAY (STMicroelectronics) feature significantly higher clamping voltage (18.6V) and peak pulse current (215A at 8/20µs pulse width), representing a different performance class. These are suitable only for applications where higher clamping voltage is acceptable or beneficial.

SMBJ8.0CA (MDD) operates at 8.0V reverse standoff with 13.6V clamping voltage, representing a lower voltage class. This part is suitable only for circuits designed for lower voltage protection thresholds.

SMBJ8.5CA-TR (STMicroelectronics) maintains 8.5V reverse standoff and 41.7A peak pulse current but exhibits elevated clamping voltage (19.5V), requiring circuit-level verification.

All recommended substitutes maintain DO-214AA (SMB) package compatibility, surface-mount configuration, and 600W peak pulse power rating.

Frequently Asked Questions (FAQ)

Q: Can SMBJ8.5CA directly replace CD214B-T8.5CALF without circuit modification?

A: Yes. SMBJ8.5CA is a direct electrical equivalent with identical reverse standoff voltage (8.5V), clamping voltage (14.4V), peak pulse current (41.7A), and package format (DO-214AA, SMB). No design changes are required.

Q: What is the difference between "Direct Equivalent" and "Similar Substitute"?

A: Direct equivalents maintain identical electrical specifications across all critical parameters. Similar substitutes exhibit minor variations in clamping voltage or peak pulse current (typically within 1-5%) but maintain the same reverse standoff voltage and package format. Similar substitutes require verification that the circuit can tolerate the parameter variations.

Q: Why do SM6T10CA and SM6T10CAY show different peak pulse current specifications?

A: These parts use different pulse width standards. SM6T10CA and SM6T10CAY are rated at 215A for 8/20µs pulse width, while the original CD214B-T8.5CALF is rated at 41.7A for 10/1000µs pulse width. These represent different transient event profiles and are not directly comparable without application-specific analysis.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitutes are ROHS3 compliant or RoHS compliant. Verify specific compliance requirements for your application and supply chain documentation.

Q: What is the significance of the temperature operating range differences?

A: SMBJ8.5CA-TP extends the upper temperature limit to 175°C compared to the original 150°C specification, providing additional thermal margin for high-temperature applications. SMBJ8.5CA extends the lower temperature limit to -65°C for enhanced cold-temperature performance. Select based on your circuit's thermal environment.

Q: Can I use SMBJ8.0CA as a substitute?

A: SMBJ8.0CA operates at a lower voltage class (8.0V reverse standoff, 13.6V clamping) and is suitable only for circuits designed for lower voltage protection thresholds. It is not a general substitute for the CD214B-T8.5CALF.

Q: What packaging options are available for substitute parts?

A: All substitute parts maintain the DO-214AA (SMB) surface-mount package format. Packaging configurations vary by manufacturer and supplier: Cut Tape (CT), Digi-Reel, Tape & Reel (TR), and Bulk options are available. Verify packaging compatibility with your assembly process.

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