CD214B-T78CALF Equivalent & Substitute Parts

Part Overview

The CD214B-T78CALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 78V reverse standoff voltage with 126V maximum clamping voltage and 4.7A peak pulse current capability in a DO-214AA (SMB) package. 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-T78CALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	78V
Voltage - Breakdown (Min)	86.7V
Voltage - Clamping (Max) @ Ipp	126V
Current - Peak Pulse (10/1000µs)	4.7A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the CD214B-T78CALF is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 78V
Voltage - Clamping (Max) @ Ipp: 126V
Current - Peak Pulse (10/1000µs): 4.7A (±tolerance acceptable)
Package / Case: DO-214AA (SMB)
Mounting Type: Surface Mount
Type: Zener, Bidirectional

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical or near-identical electrical specifications (78V standoff, 126V clamping, ~4.7A peak pulse) in the same DO-214AA package.

Similar Alternatives: Parts with comparable voltage ratings and clamping characteristics that may serve the same protective function but with minor parameter variations.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Package / Case	Operating Temperature	Product Status	RoHS Status
CD214B-T78CALF	Bourns Inc.	78V	126V	4.7A	DO-214AA, SMB	-55°C ~ 150°C	Obsolete	ROHS3 Compliant
SMBJ78CA	Meritek	78V	126V	4.76A	DO-214AA (SMB)	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ78CA-TP	Micro Commercial Co	78V	126V	4.7A	DO-214AA, SMB	-55°C ~ 175°C	Active	ROHS3 Compliant
TV06B780JB-HF	Comchip Technology	78V	126V	4.76A	DO-214AA, SMB	Not specified	Active	ROHS3 Compliant
TPSMB91CA	Littelfuse Inc.	77.8V	125V	4.9A	DO-214AA, SMB	-65°C ~ 175°C	Active	ROHS3 Compliant
SMBJ85CA	Meritek	85V	137V	4.38A	DO-214AA (SMB)	-55°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

SMBJ78CA (Meritek), SMBJ78CA-TP (Micro Commercial Co), and TV06B780JB-HF (Comchip Technology) are the preferred direct substitutes. All three maintain the 78V reverse standoff and 126V clamping voltage specifications with peak pulse currents within 0.06A of the original part. All are active products with ROHS3 compliance and DO-214AA packaging. SMBJ78CA-TP offers extended operating temperature range (-55°C ~ 175°C) compared to the original specification.

Secondary Alternatives:

TPSMB91CA (Littelfuse Inc.) provides a close alternative with 77.8V standoff and 125V clamping, differing by less than 1V in both parameters. This part includes AEC-Q101 automotive qualification and operates across -65°C ~ 175°C. Selection is appropriate when automotive-grade components are required.

SMBJ85CA (Meritek) represents a higher voltage alternative with 85V standoff and 137V clamping. This part is suitable only when circuit design permits higher voltage thresholds and is not a direct replacement for the original 78V specification.

All substitute candidates are ROHS3 compliant and maintain the same DO-214AA surface-mount package, ensuring mechanical and thermal compatibility.

Frequently Asked Questions (FAQ)

Q: Can SMBJ78CA directly replace CD214B-T78CALF?

A: Yes. SMBJ78CA matches the critical electrical parameters: 78V reverse standoff, 126V clamping voltage, and 4.76A peak pulse current. Both use DO-214AA packaging and are ROHS3 compliant. The primary difference is product status—SMBJ78CA is active while CD214B-T78CALF is obsolete.

Q: What is the difference between SMBJ78CA and SMBJ78CA-TP?

A: Both parts share identical electrical specifications (78V standoff, 126V clamping, 4.7A peak pulse). SMBJ78CA-TP offers an extended operating temperature range of -55°C ~ 175°C compared to SMBJ78CA at -55°C ~ 150°C. Selection depends on thermal requirements of the application.

Q: Is TPSMB91CA a suitable replacement?

A: TPSMB91CA is a close alternative with 77.8V standoff and 125V clamping—within 1V of the original specifications. It is suitable for applications where automotive-grade qualification (AEC-Q101) is required. The 4.9A peak pulse current is slightly higher, providing additional margin. Verify circuit design permits these minor voltage variations.

Q: Why is SMBJ85CA listed as a substitute if the voltage is different?

A: SMBJ85CA (85V standoff, 137V clamping) is included as a similar alternative for reference. It is not a direct replacement due to higher voltage thresholds. Selection is appropriate only when circuit topology permits higher protection voltages and is not recommended as a standard substitute for the 78V specification.

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

A: Yes. All listed substitutes use DO-214AA (SMB) surface-mount packaging, ensuring mechanical and thermal compatibility with the original CD214B-T78CALF footprint.

Q: Do all substitutes meet RoHS compliance?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the environmental and regulatory requirements of the original component.

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