CD214C-T40CALF Equivalent & Substitute Parts

Part Overview

The CD214C-T40CALF 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 40V reverse standoff voltage with 64.5V maximum clamping voltage and 23.3A 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
Manufacturer Part Number	CD214C-T40CALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Package / Case	DO-214AB, SMC
Type	Zener
Voltage - Reverse Standoff (Typ)	40V
Voltage - Breakdown (Min)	44.4V
Voltage - Clamping (Max) @ Ipp	64.5V
Current - Peak Pulse (10/1000µs)	23.3A
Power - Peak Pulse	1500W (1.5kW)
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the CD214C-T40CALF are categorized based on electrical parameter compatibility and package equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - Reverse Standoff: 40V (exact match required)
Voltage - Breakdown (Min): 44.4V (exact match required)
Voltage - Clamping (Max) @ Ipp: 64.5V (exact match required)
Package / Case: DO-214AB, SMC (exact match required)
Mounting Type: Surface Mount (exact match required)

Direct Substitutes maintain all critical electrical parameters and package specifications, differing only in manufacturer or minor product line designation. These parts are interchangeable without circuit modification.

Similar Substitutes maintain the core voltage and package specifications but differ in peak pulse current capability or power dissipation rating. These parts are suitable for applications where the higher current or power rating does not create design conflicts, or where the lower rating is acceptable for the specific circuit requirement.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status
CD214C-T40CALF	Bourns Inc.	40V	44.4V	64.5V	23.3A	1500W	-55°C ~ 150°C	DO-214AB, SMC	Obsolete
SMCJ40CA	MDD	40V	44.4V	64.5V	23.3A	1500W	-50°C ~ 150°C	DO-214AB, SMC	Active
SMCJ40CA-13-F	Diodes Incorporated	40V	44.4V	64.5V	23.2A	1500W	-55°C ~ 150°C	DO-214AB, SMC	Active
SMCJ40CA-HR	Littelfuse Inc.	40V	44.4V	64.5V	23.3A	1500W	-65°C ~ 150°C	DO-214AB, SMC	Active
SMCJ40CA-TR	STMicroelectronics	40V	44.4V	84V	119A (8/20µs)	1500W	-55°C ~ 150°C	DO-214AB, SMC	Active
5.0SMDJ40CA	MDE Semiconductor Inc	40V	44.4V	64.5V	77.6A	5000W	-55°C ~ 150°C	DO-214AB, SMC	Active
5.0SMDJ40CA-T7	Littelfuse Inc.	40V	44.4V	64.5V	77.6A	5000W	-65°C ~ 150°C	DO-214AB, SMC	Active
SMDJ40CA	Alpha & Omega Semiconductor Inc.	40V	44.4V	64.5V	46.6A	3000W	-55°C ~ 150°C	DO-214AB, SMC	Active
SMDJ40CA-T7	Littelfuse Inc.	40V	44.4V	64.5V	46.5A	3000W	-65°C ~ 150°C	DO-214AB, SMC	Active

Engineering Selection Recommendations

Direct Substitutes (Recommended Priority):

SMCJ40CA (MDD) is the primary direct substitute, maintaining identical electrical specifications and package configuration. This part is in active production status with high inventory availability (80,100 pcs), ensuring long-term supply continuity.

SMCJ40CA-13-F (Diodes Incorporated) provides direct substitution with peak pulse current of 23.2A, within acceptable tolerance of the original 23.3A specification. Operating temperature range matches the original part (-55°C ~ 150°C). Active product status supports ongoing availability.

SMCJ40CA-HR (Littelfuse Inc.) offers direct electrical equivalence with extended operating temperature range (-65°C ~ 150°C), providing enhanced performance margin for temperature-sensitive applications. Active production status ensures supply reliability.

Similar Substitutes (Application-Dependent Selection):

5.0SMDJ40CA and 5.0SMDJ40CA-T7 maintain voltage specifications but provide significantly higher peak pulse current (77.6A) and power dissipation (5000W). These parts are suitable for applications requiring enhanced transient energy absorption capability or where circuit design permits higher current handling without adverse effects.

SMDJ40CA and SMDJ40CA-T7 provide intermediate current and power ratings (46.5-46.6A, 3000W), offering a middle-ground option between the original specification and the 5.0SMDJ series.

SMCJ40CA-TR (STMicroelectronics) differs in clamping voltage (84V vs. 64.5V) and peak pulse current (119A), making it unsuitable for direct substitution in circuits designed for the original 64.5V clamping specification.

All recommended substitutes maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can SMCJ40CA directly replace CD214C-T40CALF without circuit modification?

A: Yes. SMCJ40CA maintains identical voltage specifications (40V standoff, 44.4V breakdown, 64.5V clamping) and DO-214AB package configuration. The part is electrically and mechanically interchangeable.

Q: What is the difference between direct and similar substitutes?

A: Direct substitutes maintain all critical electrical parameters (voltage ratings and current specifications) within acceptable tolerance. Similar substitutes maintain voltage specifications but differ in peak pulse current or power dissipation ratings. Similar substitutes require circuit analysis to confirm suitability for the specific application.

Q: Why does SMCJ40CA-TR have a different clamping voltage (84V)?

A: SMCJ40CA-TR is a different product variant within the SMCJ series, designed for applications requiring higher clamping voltage. It is not suitable for circuits designed for 64.5V clamping and should not be used as a substitute for CD214C-T40CALF.

Q: Are the 5.0SMDJ series parts suitable replacements?

A: The 5.0SMDJ series maintains the required voltage specifications but provides significantly higher peak pulse current (77.6A vs. 23.3A) and power dissipation (5000W vs. 1500W). These parts are suitable only if the circuit design permits higher current handling or if enhanced transient protection is desired. Circuit analysis is required to confirm compatibility.

Q: What is the significance of the operating temperature range difference?

A: SMCJ40CA-HR and the 5.0SMDJ series extend the lower operating temperature limit to -65°C compared to the original -55°C specification. This provides additional margin for applications operating in extreme cold environments. For standard temperature range applications (-55°C to 150°C), this difference is not significant.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing processes and environmental regulations.

Q: What packaging options are available for these substitutes?

A: All substitute parts are supplied in DO-214AB (SMC) surface mount package, matching the original CD214C-T40CALF package specification. Packaging formats (Tape & Reel, Cut Tape) vary by manufacturer and supplier but do not affect electrical or mechanical compatibility.

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