CD214L-T78ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T78ALF is a unidirectional 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 22.8A peak pulse current capability in a DO-214AB (SMC) 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)	78V	V
Voltage - Breakdown (Min)	86.7V	V
Voltage - Clamping (Max) @ Ipp	126V	V
Current - Peak Pulse (10/1000µs)	22.8A	A
Power - Peak Pulse	3000W	W
Operating Temperature Range	-55°C to 150°C	°C (TJ)
Package / Case	DO-214AB, SMC	-
Type	Zener	-
Unidirectional Channels	1	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the CD214L-T78ALF is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - Reverse Standoff (Typ): 78V
Voltage - Breakdown (Min): 86.7V
Voltage - Clamping (Max) @ Ipp: 126V
Package / Case: DO-214AB, SMC
Type: Zener, Unidirectional (1 channel)
RoHS Status: ROHS3 Compliant

Flexible Parameters (allowing substitution with different values):

Current - Peak Pulse (10/1000µs): 22.8A or higher
Power - Peak Pulse: 3000W or higher
Operating Temperature Range: -55°C to 150°C or wider
Mounting Type: Surface Mount
Product Status: Active or Obsolete

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical voltage specifications, current ratings, and power dissipation (SMLJ78A, SMCJ78A, SMCJ78A-TP, SMDJ78A, TPSMC91A). These provide pin-for-pin and functional compatibility.

Higher-Performance Alternatives: Parts with identical voltage specifications but enhanced current and power ratings (5.0SMDJ78A, 5.0SMDJ78A-T7). These provide superior transient protection capability while maintaining voltage compatibility.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ)	VBR (Min)	VC (Max)	Ipp (A)	Power (W)	Temp Range (°C)	Status	Package
CD214L-T78ALF	Bourns Inc.	78V	86.7V	126V	22.8	3000	-55 to 150	Obsolete	DO-214AB
SMLJ78A	Bourns Inc.	78V	86.7V	126V	22.8	3000	-55 to 150	Active	DO-214AB
SMCJ78A	MDD	78V	86.7V	126V	11.9	1500	-50 to 150	Active	DO-214AB
SMCJ78A-TP	Micro Commercial Co	78V	86.7V	126V	11.9	1500	-55 to 175	Active	DO-214AB
SMDJ78A	Alpha & Omega Semiconductor Inc.	78V	86.7V	126V	23.9	3000	-55 to 150	Active	DO-214AB
TPSMC91A	Littelfuse Inc.	77.8V	86.5V	125V	12.2	1500	-55 to 150	Active	DO-214AB
5.0SMDJ78A	Taiwan Semiconductor Corporation	78V	86.7V	126V	39.7	5000	-55 to 175	Active	DO-214AB
5.0SMDJ78A-T7	Littelfuse Inc.	78V	86.7V	126V	39.7	5000	-65 to 150	Active	DO-214AB

Engineering Selection Recommendations

For Direct Replacement (Obsolete Part Mitigation):

SMLJ78A (Bourns Inc.) is the primary direct equivalent. It maintains identical electrical specifications to the CD214L-T78ALF while offering active product status, ensuring long-term availability and supply chain continuity. Both parts are ROHS3 compliant with MSL 1 rating.

SMDJ78A (Alpha & Omega Semiconductor Inc.) provides equivalent performance with marginally higher peak pulse current (23.9A vs. 22.8A) and maintains identical power dissipation and voltage specifications. Active status and ROHS3 compliance support procurement reliability.

For Enhanced Protection Requirements:

5.0SMDJ78A (Taiwan Semiconductor Corporation) and 5.0SMDJ78A-T7 (Littelfuse Inc.) offer superior transient suppression with 39.7A peak pulse current and 5000W power dissipation while maintaining identical voltage specifications. These parts are suitable for applications requiring higher transient energy absorption. Both are ROHS3 compliant and active products.

For Cost-Optimized Applications:

SMCJ78A (MDD) and SMCJ78A-TP (Micro Commercial Co) provide functional substitution with reduced current and power ratings (11.9A, 1500W). These parts are appropriate for lower-energy transient environments and offer cost advantages. SMCJ78A-TP extends operating temperature to 175°C, supporting thermal margin applications.

For Automotive Applications:

TPSMC91A (Littelfuse Inc.) carries AEC-Q101 automotive qualification with near-equivalent voltage specifications (77.8V standoff, 125V clamping). This part is suitable for automotive-grade designs requiring industry certification.

Frequently Asked Questions (FAQ)

Q: Can SMCJ78A replace CD214L-T78ALF directly?

A: SMCJ78A maintains identical voltage specifications (78V standoff, 126V clamping) and package (DO-214AB). However, it has reduced current capacity (11.9A vs. 22.8A) and power dissipation (1500W vs. 3000W). Direct replacement is acceptable only if the application's transient energy requirements do not exceed 1500W peak pulse power.

Q: What is the difference between SMLJ78A and SMDJ78A?

A: Both parts match the CD214L-T78ALF voltage specifications and package. SMLJ78A (Bourns Inc.) is the direct equivalent with identical 22.8A current and 3000W power. SMDJ78A (Alpha & Omega Semiconductor Inc.) offers marginally higher current (23.9A) with the same power rating. Both are functionally interchangeable for the original application.

Q: When should I use 5.0SMDJ78A instead of SMLJ78A?

A: Use 5.0SMDJ78A when the application experiences transient pulses exceeding 3000W peak power or requires current handling above 22.8A. The 5000W rating and 39.7A capability provide enhanced protection margin. Voltage specifications remain identical, ensuring circuit compatibility.

Q: Is TPSMC91A suitable for non-automotive applications?

A: Yes. TPSMC91A is AEC-Q101 qualified but functions as a general-purpose TVS diode. Its voltage specifications (77.8V standoff, 125V clamping) are within acceptable tolerance of the CD214L-T78ALF. It is suitable for any application where the slightly lower voltage ratings are acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. Compliance status is consistent across direct equivalents and higher-performance alternatives, supporting environmental and regulatory requirements.

Q: Can I use SMCJ78A-TP in high-temperature environments?

A: SMCJ78A-TP operates to 175°C junction temperature, compared to 150°C for the CD214L-T78ALF. This extended range supports applications with elevated ambient or self-heating conditions. Voltage and current specifications remain compatible with the original design.

Q: What packaging options are available for these substitutes?

A: All substitute parts use DO-214AB (SMC) surface-mount packaging, identical to the CD214L-T78ALF. Tape & Reel (TR) packaging is standard for production quantities. No package conversion is required for PCB assembly compatibility.

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