CD214A-T78CALF Equivalent & Substitute Parts

Part Overview

The CD214A-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 a 126V maximum clamping voltage and 3.2A peak pulse current capability in a DO-214AC (SMA) package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

CD214A-T78CALF

Bourns Inc.In Stock: 827CD214A-T78CALF Datasheet

Current PartRFQ

SMAJ78CA

MDDIn Stock: 36912SMAJ78CA Datasheet

DirectRFQ

SMAJ78CA

MDDIn Stock: 36912SMAJ78CA Datasheet

DirectRFQ

SMAJ78CA-TP

Micro Commercial CoIn Stock: 5777SMAJ78CA-TP Datasheet

SimilarRFQ

SMAJ85CA-M3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 938SMAJ85CA-M3/61 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD214A-T78CALF is determined by strict alignment of electrical and mechanical parameters. The critical parameters governing substitution are:

• Voltage - Reverse Standoff (Typ): 78V
• Voltage - Clamping (Max) @ Ipp: 126V
• Current - Peak Pulse (10/1000µs): 3.2A
• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• Type: Zener, Bidirectional Channels: 1

Substitute parts are classified into two categories:

Direct Equivalents: Parts with identical electrical specifications (78V standoff, 126V clamping, 3.2A peak pulse) and matching package configuration.

Similar Alternatives: Parts with the same package and mounting type but with variations in peak pulse current (2.2A instead of 3.2A) or clamping voltage (137V instead of 126V). These parts operate within the same voltage class but with different current or power handling characteristics.

Parameter Comparison

Engineering Selection Recommendations

SMAJ78CA (MDD): This part is the primary direct equivalent to the CD214A-T78CALF. It maintains identical electrical specifications (78V standoff, 126V clamping, 3.2A peak pulse) and package configuration. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. The operating temperature range is -50 to 150°C, which is slightly narrower at the lower end compared to the original part (-55°C minimum). This substitute is suitable for direct replacement in applications where the -50°C lower temperature limit is acceptable.

SMAJ78CA-TP (Micro Commercial Co): This part shares the same voltage specifications (78V standoff, 126V clamping) and package as the main part but operates at a reduced peak pulse current of 2.2A compared to the original 3.2A. It is suitable for applications where the lower current rating is sufficient. The part offers an extended upper operating temperature of 175°C (TA) and maintains ROHS3 compliance. Selection of this part requires confirmation that the 2.2A peak pulse current meets circuit protection requirements.

SMAJ85CA-M3/61 (Vishay General Semiconductor): This part operates at a higher voltage class (85V standoff, 137V clamping) with reduced peak pulse current (2.2A) and lower peak pulse power (300W). This substitute is applicable only in circuits where the higher voltage rating is compatible with the design specification. The part is manufactured by Vishay under the TransZorb® series designation and maintains ROHS3 compliance.

All substitute parts are available in active production status with established supply chains, addressing the obsolescence of the original CD214A-T78CALF component.

Frequently Asked Questions (FAQ)

Q: Can SMAJ78CA be used as a direct replacement for CD214A-T78CALF?

A: Yes. SMAJ78CA is a direct electrical equivalent with identical voltage specifications (78V standoff, 126V clamping) and peak pulse current (3.2A). Both parts use the DO-214AC (SMA) package for surface-mount applications. The primary difference is the lower operating temperature minimum (-50°C vs. -55°C). Verify that this temperature range is acceptable for your application before substitution.

Q: What is the difference between SMAJ78CA and SMAJ78CA-TP?

A: Both parts maintain the same voltage specifications (78V standoff, 126V clamping) and package type. The key difference is peak pulse current: SMAJ78CA operates at 3.2A, while SMAJ78CA-TP operates at 2.2A. SMAJ78CA-TP also offers an extended upper operating temperature of 175°C. Selection depends on whether the lower current rating satisfies circuit protection requirements.

Q: When should SMAJ85CA-M3/61 be considered?

A: SMAJ85CA-M3/61 operates at a higher voltage class (85V standoff, 137V clamping) with reduced current handling (2.2A peak pulse, 300W peak power). This part is suitable only for circuits designed for higher voltage protection levels. It is not a direct substitute for the 78V-rated CD214A-T78CALF unless the circuit design specifically requires 85V protection.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts (SMAJ78CA, SMAJ78CA-TP, and SMAJ85CA-M3/61) are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1), matching the compliance profile of the original CD214A-T78CALF.

Q: What packaging formats are available for these substitutes?

A: All substitute parts are supplied in Tape & Reel (TR) packaging for automated assembly. The physical package remains DO-214AC (SMA) for all parts, ensuring compatibility with existing PCB layouts and pick-and-place equipment.

Q: How do I determine which substitute is appropriate for my design?

A: Evaluate your circuit requirements against these parameters: (1) Required voltage protection level (78V or 85V standoff), (2) Peak pulse current requirement (3.2A or 2.2A), (3) Operating temperature range, (4) Supply chain availability. SMAJ78CA is the preferred substitute if your circuit requires 3.2A current handling and -55°C minimum temperature operation. SMAJ78CA-TP is suitable for lower current applications with extended temperature range. SMAJ85CA-M3/61 applies only to circuits requiring higher voltage protection.