CD214A-T78ALF Equivalent & Substitute Parts

Part Overview

The CD214A-T78ALF is a unidirectional Zener 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 3.2A peak pulse current capability in a DO-214AC (SMA) package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	78	V
Voltage - Breakdown (Min)	86.7	V
Voltage - Clamping (Max) @ Ipp	126	V
Current - Peak Pulse (10/1000µs)	3.2	A
Power - Peak Pulse	400	W
Package / Case	DO-214AC, SMA	—
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the CD214A-T78ALF is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 78V
Voltage - Clamping (Max) @ Ipp: Must be 126V
Package / Case: Must be DO-214AC (SMA)
Mounting Type: Must be Surface Mount
Type: Must be Zener
Unidirectional Channels: Must be 1

Substitute parts are classified into two categories:

Direct Substitutes meet all critical parameters with minimal variation in peak pulse current (within acceptable operating margins).

Similar Substitutes maintain the same voltage ratings and package but may have variations in peak pulse current or clamping voltage that require circuit-level evaluation.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ) [V]	VBR (Min) [V]	VC (Max) [V]	Ipp (10/1000µs) [A]	Power [W]	Package	Status
CD214A-T78ALF	Bourns Inc.	78	86.7	126	3.2	400	DO-214AC (SMA)	Obsolete
SMAJ78A	Meritek	78	86.7	126	3.17	400	DO-214AC (SMA)	Active
TV04A780J-G	Comchip Technology	78	86.7	126	3.17	400	DO-214AC (SMA)	Active
SMAJ78A-TP	Micro Commercial Co	78	86.7	126	2.2	400	DO-214AC (SMA)	Active
SMAJP4KE91A-TP	Micro Commercial Co	77.8	86.5	125	3.3	400	DO-214AC (SMA)	Active
P4SMA100A-M3/61	Vishay General Semiconductor - Diodes Division	85.5	95	137	2.2	300	DO-214AC (SMA)	Active

Engineering Selection Recommendations

Direct Substitutes (Preferred for Obsolescence Replacement):

SMAJ78A (Meritek) and TV04A780J-G (Comchip Technology) are the primary direct substitutes. Both maintain identical voltage ratings (78V standoff, 126V clamping) and peak pulse current specifications (3.17A), with 400W power dissipation in the same DO-214AC (SMA) package. Both parts are active products with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). These parts provide direct functional equivalence with no circuit redesign required.

Secondary Substitutes (Acceptable with Margin Verification):

SMAJ78A-TP (Micro Commercial Co) maintains the same voltage ratings and package but operates at reduced peak pulse current (2.2A versus 3.2A). This part is suitable for applications where the circuit design includes adequate current margin or where lower peak pulse requirements are acceptable. Extended operating temperature range (-55°C to 175°C) provides additional thermal headroom.

SMAJP4KE91A-TP (Micro Commercial Co) offers comparable performance with 77.8V standoff voltage and 125V clamping voltage, with slightly higher peak pulse current (3.3A). Voltage parameters remain within acceptable tolerance for general-purpose protection applications.

Not Recommended as Direct Substitute:

P4SMA100A-M3/61 (Vishay) exhibits significant parameter deviation with 85.5V standoff voltage and 137V clamping voltage, representing a 7.5V increase in standoff voltage and 11V increase in clamping voltage. Additionally, peak pulse current is reduced to 2.2A and power dissipation to 300W. This part is classified as a similar substitute only and requires full circuit re-evaluation before implementation.

Frequently Asked Questions (FAQ)

Q: Can SMAJ78A-TP be used as a direct replacement for CD214A-T78ALF?

A: SMAJ78A-TP maintains identical voltage ratings (78V standoff, 126V clamping) and package (DO-214AC SMA) but operates at 2.2A peak pulse current versus the original 3.2A specification. This substitution is acceptable if circuit design margins accommodate the reduced current rating. Verify that the maximum expected transient current does not exceed 2.2A.

Q: What is the difference between SMAJ78A and TV04A780J-G?

A: Both parts are direct substitutes with identical electrical specifications: 78V standoff, 126V clamping, 3.17A peak pulse current, and 400W power dissipation in DO-214AC (SMA) packages. The primary difference is manufacturer (Meritek versus Comchip Technology). Selection may be based on supplier availability and procurement lead times.

Q: Why is P4SMA100A-M3/61 listed as a similar substitute rather than a direct substitute?

A: P4SMA100A-M3/61 deviates from the original specification in multiple critical parameters: standoff voltage is 85.5V (7.5V higher), clamping voltage is 137V (11V higher), peak pulse current is 2.2A (1A lower), and power dissipation is 300W (100W lower). These variations require circuit-level analysis to confirm compatibility and are not suitable for direct pin-for-pin replacement without design review.

Q: Are all substitute parts RoHS3 compliant?

A: SMAJ78A, TV04A780J-G, SMAJ78A-TP, and SMAJP4KE91A-TP are all ROHS3 compliant. P4SMA100A-M3/61 is also ROHS3 compliant. All parts meet current environmental compliance requirements.

Q: What is the operating temperature range for substitute parts?

A: SMAJ78A and TV04A780J-G operate from -55°C to 150°C. SMAJ78A-TP and SMAJP4KE91A-TP extend to -55°C to 175°C, providing additional thermal margin. P4SMA100A-M3/61 operates from -65°C to 150°C. Select based on application thermal requirements.

Q: Can substitute parts be used in tape and reel packaging?

A: SMAJ78A is available in standard packaging. SMAJ78A-TP, TV04A780J-G, and P4SMA100A-M3/61 are available in Tape & Reel (TR) packaging for automated assembly. Verify packaging availability with your supplier before procurement.

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