CD214B-T85CALF Equivalent & Substitute Parts

Part Overview

The CD214B-T85CALF 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 85V reverse standoff voltage with a 137V maximum clamping voltage and 4.4A peak pulse current capability in the DO-214AA (SMB) package format. The part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214B-T85CALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	85V
Voltage - Breakdown (Min)	94.4V
Voltage - Clamping (Max) @ Ipp	137V
Current - Peak Pulse (10/1000µs)	4.4A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CD214B-T85CALF is determined by the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 85V
Voltage - Clamping (Max) @ Ipp: 137V
Current - Peak Pulse (10/1000µs): 4.4A (±0.2A tolerance acceptable)
Power - Peak Pulse: 600W
Package / Case: DO-214AA (SMB)
Mounting Type: Surface Mount
Type: Zener, Bidirectional, Single Channel

Substitute parts are classified into two categories:

Direct Substitutes: Parts with identical electrical specifications and active product status, suitable for direct replacement without circuit redesign.

Similar Substitutes: Parts with minor variations in peak pulse current (within ±0.2A) or operating temperature range, requiring engineering evaluation for specific application requirements.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ)	Vc (Max)	Ipp (A)	Package	Status	Temp Range
CD214B-T85CALF	Bourns Inc.	85V	137V	4.4A	DO-214AA (SMB)	Obsolete	-55°C ~ 150°C
SMBJ85CA	Meritek	85V	137V	4.38A	DO-214AA (SMB)	Active	-55°C ~ 150°C
SMBJ85CA-TP	Micro Commercial Co	85V	137V	4.4A	DO-214AA (SMB)	Active	-55°C ~ 175°C
SMBJ85CA-TR	STMicroelectronics	85V	137V	4.6A	DO-214AA (SMB)	Active	-55°C ~ 150°C
TPSMB91CA	Littelfuse Inc.	77.8V	125V	4.9A	DO-214AA (SMB)	Active	-65°C ~ 175°C
TV06B850JB-HF	Comchip Technology	85V	137V	4.38A	DO-214AA (SMB)	Active	Not Specified

Engineering Selection Recommendations

Recommended Direct Substitutes (Active Status, Identical Specifications):

SMBJ85CA (Meritek), SMBJ85CA-TP (Micro Commercial Co), and SMBJ85CA-TR (STMicroelectronics) are the primary alternatives. All three maintain the 85V reverse standoff and 137V clamping voltage specifications with peak pulse currents within 0.2A of the original part. SMBJ85CA-TP and SMBJ85CA-TR offer extended operating temperature ranges (-55°C ~ 175°C), providing additional thermal margin for demanding applications.

Secondary Substitute (Voltage Deviation):

TPSMB91CA (Littelfuse Inc.) presents a voltage deviation with 77.8V reverse standoff and 125V clamping voltage. This part is suitable only for applications where the lower voltage rating is acceptable and does not compromise circuit protection requirements. The automotive-grade qualification (AEC-Q101) and extended temperature range (-65°C ~ 175°C) may justify selection in automotive or high-reliability applications.

Alternative Substitute (Specification Match):

TV06B850JB-HF (Comchip Technology) matches the electrical specifications of the original part with 85V reverse standoff, 137V clamping voltage, and 4.38A peak pulse current. Operating temperature range is not specified in available documentation.

All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage practices.

Frequently Asked Questions (FAQ)

Q: Can SMBJ85CA-TR be used as a direct replacement for CD214B-T85CALF?

A: Yes. SMBJ85CA-TR maintains identical voltage specifications (85V VWM, 137V Vc) and equivalent peak pulse current (4.6A vs. 4.4A). The extended operating temperature range (-55°C ~ 175°C) provides additional thermal capability. Both parts use the DO-214AA (SMB) package and are ROHS3 compliant.

Q: What is the difference between SMBJ85CA and SMBJ85CA-TP?

A: Both parts share identical electrical specifications (85V VWM, 137V Vc, 4.4A Ipp). The primary difference is packaging: SMBJ85CA-TP is supplied in Cut Tape (CT) format, while SMBJ85CA is supplied in standard packaging. SMBJ85CA-TP also offers an extended operating temperature range (-55°C ~ 175°C) compared to the standard -55°C ~ 150°C.

Q: Is TPSMB91CA a suitable substitute?

A: TPSMB91CA is a similar substitute with voltage deviations. It features 77.8V reverse standoff (vs. 85V) and 125V clamping voltage (vs. 137V). Selection requires verification that the lower voltage rating does not compromise circuit protection. The automotive-grade qualification and extended temperature range may be beneficial for specific applications.

Q: Are all substitute parts available in the same package format?

A: Yes. All substitute parts listed use the DO-214AA (SMB) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Q: What compliance certifications apply to these substitute parts?

A: All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. TPSMB91CA additionally carries AEC-Q101 automotive qualification. REACH compliance varies by manufacturer; refer to individual datasheets for specific REACH status.

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