CD214C-T78ALF Equivalent & Substitute Parts

Part Overview

The CD214C-T78ALF is a 78V unidirectional transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface mount applications. This component features a 126V maximum clamping voltage, 11.4A peak pulse current capability, and 1500W peak pulse power rating in a DO-214AB (SMC) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	78V
Voltage - Breakdown (Min)	86.7V
Voltage - Clamping (Max) @ Ipp	126V
Current - Peak Pulse (10/1000µs)	11.4A
Power - Peak Pulse	1500W
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 78V
Voltage - Breakdown (Min): 86.7V
Voltage - Clamping (Max) @ Ipp: 126V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Unidirectional Channels: 1

Direct Equivalents (SMCJ78A variants from MDD and Littelfuse): These parts maintain identical voltage specifications and clamping characteristics with equivalent or superior peak pulse current ratings (11.9A). All feature the same DO-214AB package and surface mount configuration.

Similar Substitutes (5.0SMDJ78A variants and SMDJ78A): These parts share the core voltage parameters and package type but feature higher peak pulse current ratings (23.9A to 39.7A) and increased power dissipation capability (3000W to 5000W). These are suitable where enhanced transient protection margin is acceptable.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status
CD214C-T78ALF	Bourns Inc.	78V	126V	11.4A	1500W	-55°C ~ 150°C	Obsolete
SMCJ78A	MDD	78V	126V	11.9A	1500W	-50°C ~ 150°C	Active
SMCJ78A-HR	Littelfuse Inc.	78V	126V	11.9A	1500W	-65°C ~ 150°C	Active
SMCJ78A-HRA	Littelfuse Inc.	78V	126V	11.9A	1500W	-65°C ~ 150°C	Active
SMCJ78A-HRAT7	Littelfuse Inc.	78V	126V	11.9A	1500W	-65°C ~ 150°C	Active
SMCJ78A-TP	Micro Commercial Co	78V	126V	11.9A	1500W	-55°C ~ 175°C	Active
SMDJ78A	Alpha & Omega Semiconductor Inc.	78V	126V	23.9A	3000W	-55°C ~ 150°C	Active
5.0SMDJ78A	Taiwan Semiconductor Corporation	78V	126V	39.7A	5000W	-55°C ~ 175°C	Active
5.0SMDJ78A-T7	Littelfuse Inc.	78V	126V	39.7A	5000W	-65°C ~ 150°C	Active

Engineering Selection Recommendations

For Direct Replacement (Equivalent Performance): Select SMCJ78A (MDD), SMCJ78A-HR, SMCJ78A-HRA, SMCJ78A-HRAT7 (all Littelfuse), or SMCJ78A-TP (Micro Commercial Co). These parts deliver matching voltage specifications and peak pulse current within 4% of the original CD214C-T78ALF. All are ROHS3 compliant and carry active product status with established supply availability.

For Enhanced Protection Margin: SMDJ78A (Alpha & Omega Semiconductor Inc.) provides 2.1x power dissipation capability (3000W vs 1500W) while maintaining identical voltage parameters. This option is suitable for applications requiring additional transient suppression margin without circuit redesign.

For Maximum Transient Protection: 5.0SMDJ78A variants (Taiwan Semiconductor Corporation and Littelfuse 5.0SMDJ78A-T7) offer 3.3x power dissipation (5000W) and 4.6x peak pulse current (39.7A). These are appropriate for high-energy transient environments or where design margin enhancement is specified.

All substitute options maintain DO-214AB package compatibility, surface mount configuration, and ROHS3 compliance. Selection should be based on circuit protection requirements and thermal design constraints.

Frequently Asked Questions (FAQ)

Q: Can SMCJ78A-TP directly replace CD214C-T78ALF in existing designs? A: Yes. SMCJ78A-TP maintains identical voltage specifications (78V standoff, 126V clamping), equivalent peak pulse current (11.9A vs 11.4A), and identical package (DO-214AB SMC). The extended operating temperature range (-55°C ~ 175°C) provides additional margin. No circuit modification is required.

Q: What is the difference between SMCJ78A variants from different manufacturers? A: All SMCJ78A variants (MDD, Littelfuse HR/HRA/HRAT7, Micro Commercial TP) share identical electrical specifications. Differences exist in temperature range, packaging format (tape & reel), and manufacturer-specific product series designations. Selection can be based on supply availability and procurement preference.

Q: When should SMDJ78A or 5.0SMDJ78A be selected instead of direct equivalents? A: Higher-power variants (SMDJ78A at 3000W, 5.0SMDJ78A at 5000W) should be selected when circuit analysis indicates transient energy levels exceed the 1500W rating of the original part, or when design margin enhancement is required. These maintain voltage compatibility while providing increased protection capability.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original CD214C-T78ALF specification.

Q: Does package compatibility extend to all substitute options? A: Yes. All substitute parts use DO-214AB (SMC) surface mount package, ensuring PCB footprint and reflow process compatibility with the original design.

Q: What is the impact of temperature range differences between substitutes? A: Temperature range variations (e.g., -50°C to -65°C minimum, or 150°C to 175°C maximum) do not affect substitution eligibility if the application operating temperature falls within the substitute part's specified range. Verify application requirements against selected part specifications.

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