CD214C-T40ALF Equivalent & Substitute Parts

Part Overview

The CD214C-T40ALF is a 40V Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., rated for 64.5V clamping voltage and 23.3A peak pulse current in a DO-214AB (SMC) surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The CD214C-T40ALF serves general-purpose transient voltage suppression applications requiring unidirectional protection at 40V standoff voltage. Substitution is driven by product lifecycle discontinuation and the need for active alternatives with compatible electrical and mechanical specifications.

Key Parameters

Parameter	Value
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
Package / Case	DO-214AB, SMC
Operating Temperature	-55°C ~ 150°C
Type	Zener
Unidirectional Channels	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CD214C-T40ALF is determined by strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 40V (required match)
Voltage - Clamping (Max) @ Ipp: 64.5V (required match)
Package / Case: DO-214AB, SMC (required match)
Type: Zener, Unidirectional (required match)
Unidirectional Channels: 1 (required match)

Acceptable Variation Range:

Current - Peak Pulse (10/1000µs): 23.3A minimum (equal or greater acceptable)
Power - Peak Pulse: 1500W minimum (equal or greater acceptable)
Operating Temperature: -55°C minimum, 150°C maximum (equal or wider range acceptable)

Direct Equivalents maintain all electrical parameters within ±5% tolerance and identical package specifications.

Similar Substitutes maintain voltage parameters and package but feature higher current ratings (77.6A) and power dissipation (5000W), suitable for applications requiring enhanced transient protection margin.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status
CD214C-T40ALF	Bourns Inc.	40V	64.5V	23.3A	1500W	DO-214AB, SMC	-55°C ~ 150°C	Obsolete
SMCJ40A	Meritek	40V	64.5V	23.26A	1500W	DO-214AB (SMC)	-55°C ~ 150°C	Active
5.0SMDJ40A	Taiwan Semiconductor Corporation	40V	64.5V	77.6A	5000W	DO-214AB (SMC)	-55°C ~ 175°C	Active
5.0SMDJ40A-T7	Littelfuse Inc.	40V	64.5V	77.6A	5000W	DO-214AB, SMC	-65°C ~ 150°C	Active
SMCJ40A-HR	Littelfuse Inc.	40V	64.5V	23.3A	1500W	DO-214AB, SMC	-65°C ~ 150°C	Active
SMCJ40A-HRA	Littelfuse	40V	64.5V	23.3A	1500W	DO-214AB, SMC	-65°C ~ 150°C	Active
SMCJ40A-HRAT7	Littelfuse	40V	64.5V	23.3A	1500W	DO-214AB, SMC	-65°C ~ 150°C	Active
SMCJ40A-M3/57T	Vishay General Semiconductor - Diodes Division	40V	64.5V	23.3A	1500W	DO-214AB, SMC	-55°C ~ 150°C	Active
SMCJ40A-TR	STMicroelectronics	40V	84V	119A (8/20µs)	1500W	DO-214AB, SMC	-55°C ~ 150°C	Active

Engineering Selection Recommendations

Direct Equivalent Selection (Preferred for Pin-for-Pin Replacement):

SMCJ40A (Meritek) is the primary direct equivalent, maintaining 23.26A peak pulse current and 1500W power dissipation within 0.3% tolerance of the original specification. This part is active and ROHS3 compliant with MSL 1 rating, ensuring procurement continuity without design modification.

SMCJ40A-M3/57T (Vishay) provides identical electrical specifications with TransZorb® series designation and active product status. Operating temperature range matches the original (-55°C ~ 150°C), making it suitable for applications with identical thermal requirements.

SMCJ40A-HR, SMCJ40A-HRA, and SMCJ40A-HRAT7 (Littelfuse) maintain exact electrical parameters with extended lower operating temperature limit (-65°C), providing enhanced thermal margin for demanding environments. All three variants are active with ROHS3 compliance and MSL 1 rating.

Enhanced Protection Alternative (Higher Current Rating):

5.0SMDJ40A (Taiwan Semiconductor Corporation) and 5.0SMDJ40A-T7 (Littelfuse) provide 77.6A peak pulse current and 5000W power dissipation while maintaining identical voltage specifications (40V standoff, 64.5V clamping). These parts are suitable for applications requiring increased transient suppression margin. The 5.0SMDJ40A-T7 variant extends lower operating temperature to -65°C.

Note on SMCJ40A-TR (STMicroelectronics):

This part exhibits 84V clamping voltage, exceeding the 64.5V specification of the original. This deviation disqualifies it as a direct substitute for applications requiring precise clamping voltage control.

Frequently Asked Questions (FAQ)

Q: Can SMCJ40A directly replace CD214C-T40ALF without PCB modification?

A: Yes. SMCJ40A maintains identical DO-214AB (SMC) package geometry, pinout, and electrical specifications (40V standoff, 64.5V clamping, 23.26A peak pulse). No PCB layout changes are required.

Q: What is the difference between SMCJ40A variants from different manufacturers?

A: All SMCJ40A variants (Meritek, Littelfuse, Vishay) maintain identical electrical specifications. Differences exist in operating temperature range (-55°C to -65°C minimum) and packaging options (Tape & Reel vs. Cut Tape). Selection depends on thermal requirements and procurement format preferences.

Q: When should I use 5.0SMDJ40A instead of SMCJ40A?

A: Use 5.0SMDJ40A when the application requires enhanced transient suppression capability. The 77.6A peak pulse current and 5000W power rating provide 3.3× greater current handling and 3.3× greater power dissipation compared to SMCJ40A. Voltage specifications remain identical, ensuring circuit compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original CD214C-T40ALF specifications.

Q: Why does SMCJ40A-TR show 84V clamping voltage?

A: SMCJ40A-TR from STMicroelectronics exhibits different electrical characteristics (84V clamping vs. 64.5V specified). This part is not recommended as a direct substitute due to clamping voltage deviation, which may affect circuit protection performance.

Q: Can I use parts with extended temperature range (-65°C minimum) in place of -55°C minimum parts?

A: Yes. Extended temperature range provides additional thermal margin and is fully compatible with applications designed for -55°C minimum operation. No design changes are required.

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