CD214L-T43ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T43ALF 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 43V reverse standoff voltage, 69.4V maximum clamping voltage, and 3000W peak pulse power rating in a DO-214AB (SMC) package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	43	V
Voltage - Breakdown (Min)	47.8	V
Voltage - Clamping (Max) @ Ipp	69.4	V
Current - Peak Pulse (10/1000µs)	43.2	A
Power - Peak Pulse	3000	W
Package / Case	DO-214AB, SMC	—
Operating Temperature Range	-55°C to 150°C	TJ
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the CD214L-T43ALF is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff: 43V
Voltage - Breakdown (Min): 47.8V
Voltage - Clamping (Max) @ Ipp: 69.4V
Package / Case: DO-214AB, SMC
Unidirectional Channels: 1
Type: Zener

Allowable Variation Parameters:

Current - Peak Pulse (10/1000µs): 43.2A minimum (higher values acceptable for enhanced performance margin)
Power - Peak Pulse: 3000W minimum (higher values acceptable)
Operating Temperature Range: -55°C to 150°C minimum (extended ranges acceptable)
RoHS and REACH compliance status (compliance maintained or improved)

Substitute parts are classified into two categories:

Direct Equivalents: Parts with identical electrical specifications and active product status (SMLJ43A, SMDJ43A, SMDJ43A-HR, SMDJ43A-HRA, SMDJ43A-HRAT7).

Enhanced Substitutes: Parts with superior current-handling or power-dissipation capabilities while maintaining voltage parameters (5.0SMDJ43A, 5.0SMDJ43A-T7). These provide additional design margin and are suitable for applications requiring higher transient current capacity.

Reduced-Capacity Substitutes: Parts with lower current or power ratings (SMCJ43A, SMCJ43A-TP). These are suitable only for applications where the lower specifications meet circuit requirements.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	VBR (V)	VC (V)	Ipp (A)	PPP (W)	Temp Range (°C)	Status
CD214L-T43ALF	Bourns Inc.	43	47.8	69.4	43.2	3000	-55 to 150	Obsolete
SMLJ43A	Bourns Inc.	43	47.8	69.4	43.2	3000	-55 to 150	Active
SMDJ43A	Alpha & Omega Semiconductor Inc.	43	47.8	69.4	43.3	3000	-55 to 150	Active
SMDJ43A-HR	Littelfuse Inc.	43	47.8	69.4	43.2	3000	-65 to 150	Active
SMDJ43A-HRA	Littelfuse Inc.	43	47.8	69.4	43.2	3000	-65 to 150	Active
SMDJ43A-HRAT7	Littelfuse Inc.	43	47.8	69.4	43.2	3000	-65 to 150	Active
5.0SMDJ43A	Taiwan Semiconductor Corporation	43	47.8	69.4	72.1	5000	-55 to 175	Active
5.0SMDJ43A-T7	Littelfuse Inc.	43	47.8	69.4	72.1	5000	-65 to 150	Active
SMCJ43A	MDD	43	47.8	69.4	21.7	1500	-50 to 150	Active
SMCJ43A-TP	Micro Commercial Co	43	47.8	69.4	21.7	1500	-55 to 175	Active

Engineering Selection Recommendations

Primary Recommendation: SMLJ43A (Bourns Inc.)

The SMLJ43A is the direct equivalent replacement for the CD214L-T43ALF. Manufactured by the same supplier (Bourns Inc.), it maintains identical electrical specifications and operating temperature range while offering active product status. This part is available in Tape & Reel packaging with 13,032 units in stock, ensuring supply continuity. RoHS3 compliance and MSL 1 rating are maintained.

Secondary Recommendations: SMDJ43A, SMDJ43A-HR, SMDJ43A-HRA, SMDJ43A-HRAT7

These alternatives provide equivalent electrical performance with active status from established manufacturers (Alpha & Omega Semiconductor Inc., Littelfuse Inc.). The Littelfuse variants (SMDJ43A-HR, SMDJ43A-HRA, SMDJ43A-HRAT7) extend the lower operating temperature limit to -65°C, suitable for applications requiring enhanced cold-temperature performance. All maintain RoHS3 compliance and MSL 1 rating.

Enhanced-Performance Option: 5.0SMDJ43A, 5.0SMDJ43A-T7

These parts provide superior transient current capacity (72.1A versus 43.2A) and power dissipation (5000W versus 3000W) while maintaining identical voltage parameters. The 5.0SMDJ43A-T7 from Littelfuse Inc. extends the lower temperature limit to -65°C. These are suitable for applications where higher transient stress margins are required or where circuit design permits utilization of enhanced specifications.

Reduced-Capacity Option: SMCJ43A, SMCJ43A-TP

These parts feature lower peak pulse current (21.7A) and power dissipation (1500W) ratings. Selection is appropriate only when circuit analysis confirms that transient stress levels remain within these reduced specifications. The SMCJ43A-TP from Micro Commercial Co offers extended upper operating temperature to 175°C.

Compliance Verification:

All recommended substitutes maintain RoHS3 compliance. REACH status varies by manufacturer; verify REACH compliance requirements for your specific application and supply chain.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher peak pulse current (Ipp) than the original CD214L-T43ALF?

A: Yes. Higher Ipp ratings (such as 72.1A in the 5.0SMDJ43A series) provide additional design margin and are electrically compatible. The circuit will experience the same clamping voltage and protection characteristics. Verify that PCB thermal design accommodates the potentially higher power dissipation during transient events.

Q: What is the difference between SMDJ43A-HR, SMDJ43A-HRA, and SMDJ43A-HRAT7?

A: All three parts from Littelfuse Inc. share identical electrical specifications (43V standoff, 69.4V clamp, 43.2A Ipp, 3000W power). The designations reflect internal product line classifications. The -HRAT7 variant indicates Tape & Reel packaging with specific lead configuration. Consult Littelfuse datasheets for detailed mechanical and packaging differences if critical for your assembly process.

Q: Is the SMCJ43A suitable as a direct replacement?

A: The SMCJ43A maintains voltage parameters identical to the CD214L-T43ALF but features reduced peak pulse current (21.7A versus 43.2A) and power dissipation (1500W versus 3000W). Use this part only if circuit analysis confirms that transient stress levels remain below 21.7A and 1500W. Exceeding these specifications may result in inadequate protection or component failure.

Q: Can I substitute the CD214L-T43ALF with a part rated for higher operating temperature?

A: Yes. Parts with extended upper temperature ratings (such as SMCJ43A-TP at -55°C to 175°C or 5.0SMDJ43A at -55°C to 175°C) are suitable replacements. Extended temperature capability does not affect circuit performance at standard operating conditions. Verify that your application does not require the lower temperature limit of -55°C; if it does, confirm the substitute part meets this requirement.

Q: What packaging options are available for substitutes?

A: All substitute parts use the DO-214AB (SMC) surface-mount package, maintaining mechanical compatibility with the original CD214L-T43ALF. Packaging format varies: some are supplied in Tape & Reel (TR) for automated assembly, while others are available in bulk or alternative formats. Verify packaging compatibility with your procurement and assembly requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts listed in this document maintain RoHS3 compliance. REACH status varies by manufacturer; verify REACH compliance for your specific supply chain and regulatory requirements.

Q: Which substitute offers the best supply availability?

A: The SMLJ43A from Bourns Inc. has the highest inventory (13,032 units in stock), followed by 5.0SMDJ43A from Taiwan Semiconductor Corporation (9,100 units). Verify current availability with your component supplier, as inventory levels change.

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