CD214L-T70ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T70ALF 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 70V reverse standoff voltage, 113V maximum clamping voltage, and 3000W peak pulse power dissipation in the DO-214AB (SMC) package format. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214L-T70ALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	70V
Voltage - Breakdown (Min)	77.8V
Voltage - Clamping (Max) @ Ipp	113V
Current - Peak Pulse (10/1000µs)	26.6A
Power - Peak Pulse	3000W (3kW)
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of TVS diodes is determined by strict equivalence across electrical and mechanical parameters. The primary criteria for direct substitution are:

Voltage - Reverse Standoff (Typ): 70V
Voltage - Clamping (Max) @ Ipp: 113V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Unidirectional configuration with single channel

Substitute parts are grouped into two categories:

Direct Equivalents maintain identical electrical specifications (70V standoff, 113V clamp, 26.6A peak pulse current, 3000W power dissipation) and are pin-compatible replacements.

Similar Equivalents maintain the core voltage specifications (70V standoff, 113V clamp) but differ in peak pulse current capacity and power dissipation. These parts are electrically compatible but provide enhanced or reduced performance characteristics. Selection depends on circuit requirements for current handling and thermal management.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Product Status
CD214L-T70ALF	Bourns Inc.	70V	113V	26.6A	3000W	DO-214AB, SMC	Obsolete
SMLJ70A	Bourns Inc.	70V	113V	26.6A	3000W	DO-214AB, SMC	Active
5.0SMDJ70A	Taiwan Semiconductor Corporation	70V	113V	44.3A	5000W	DO-214AB, SMC	Active
5.0SMDJ70A-T7	Littelfuse Inc.	70V	113V	44.3A	5000W	DO-214AB, SMC	Active
SMCJ70A	Meritek	70V	113V	13.27A	1500W	DO-214AB, SMC	Active
SMCJ70A-TP	Micro Commercial Co	70V	113V	13.3A	1500W	DO-214AB, SMC	Active
SMDJ70A	Alpha & Omega Semiconductor Inc.	70V	113V	26.6A	3000W	DO-214AB, SMC	Active
TPSMC75A	Littelfuse	64.1V	103V	14.8A	1500W	DO-214AB, SMC	Active
TPSMC82A	Littelfuse Inc.	70.1V	113V	14.6A	1500W	DO-214AB, SMC	Active

Engineering Selection Recommendations

Primary Recommendation: SMLJ70A (Bourns Inc.)

The SMLJ70A is the direct electrical and mechanical equivalent of the CD214L-T70ALF. Manufactured by the same supplier (Bourns Inc.), this part maintains identical voltage specifications (70V standoff, 113V clamp), current rating (26.6A), and power dissipation (3000W). The SMLJ70A is in active production status, ensuring long-term availability and supply chain stability. ROHS3 compliance and MSL 1 rating match the original specification.

Secondary Recommendation: SMDJ70A (Alpha & Omega Semiconductor Inc.)

The SMDJ70A provides identical electrical performance (70V standoff, 113V clamp, 26.6A, 3000W) with active product status. This part is suitable for applications requiring equivalent performance from an alternative manufacturer. ROHS3 compliance is maintained.

Higher Power Alternative: 5.0SMDJ70A or 5.0SMDJ70A-T7

These parts maintain the core voltage specifications (70V standoff, 113V clamp) but provide enhanced current handling (44.3A) and power dissipation (5000W). Selection of these parts is appropriate for circuits requiring greater transient energy absorption. Both manufacturers (Taiwan Semiconductor Corporation and Littelfuse Inc.) offer active product status and ROHS3 compliance.

Lower Power Alternatives: SMCJ70A, SMCJ70A-TP, TPSMC82A

These parts maintain voltage specifications but provide reduced current capacity (13.27A to 14.6A) and power dissipation (1500W). These are suitable for applications with lower transient energy requirements. TPSMC82A includes automotive-grade qualification (AEC-Q101) for applications requiring automotive-level reliability.

Not Recommended: TPSMC75A

The TPSMC75A deviates from the original specification with a 64.1V reverse standoff voltage and 103V clamping voltage, representing a 6% reduction in voltage rating. This part does not meet the electrical requirements of the CD214L-T70ALF and should not be used as a substitute.

Frequently Asked Questions (FAQ)

Q: Can SMLJ70A directly replace CD214L-T70ALF without circuit modification?

A: Yes. The SMLJ70A is electrically and mechanically identical to the CD214L-T70ALF. Both parts share the same voltage ratings (70V standoff, 113V clamp), current capacity (26.6A), power dissipation (3000W), and DO-214AB package. No circuit changes are required.

Q: What is the difference between the direct equivalent (SMLJ70A) and higher-power alternatives (5.0SMDJ70A)?

A: The SMLJ70A maintains the original 3000W power rating and 26.6A current capacity. The 5.0SMDJ70A series provides 5000W power dissipation and 44.3A current capacity, offering greater transient energy absorption. Selection depends on whether the circuit experiences transient events exceeding the original specification. If the original design operated within 3000W limits, the SMLJ70A is the appropriate choice.

Q: Are lower-power alternatives (SMCJ70A, TPSMC82A) suitable replacements?

A: Lower-power alternatives are suitable only if circuit analysis confirms that transient energy remains below 1500W and peak pulse current does not exceed 14.6A. These parts maintain the voltage specifications but provide reduced protection margin. Use only if the original design included power dissipation headroom or if circuit modifications reduce transient severity.

Q: Why is TPSMC75A listed but not recommended?

A: The TPSMC75A has a 64.1V reverse standoff voltage and 103V clamping voltage, which are 6% lower than the CD214L-T70ALF specification. This voltage deviation makes it unsuitable for direct substitution. Use only if circuit design specifically requires a lower voltage rating.

Q: What compliance certifications should I verify for substitute parts?

A: All recommended substitute parts maintain ROHS3 compliance and MSL 1 rating, matching the original specification. The TPSMC82A and 5.0SMDJ70A-T7 include additional automotive-grade qualification (AEC-Q101) for applications requiring automotive reliability standards. Verify compliance requirements with your specific application before final part selection.

Q: Are there packaging differences between substitute parts?

A: All substitute parts use the DO-214AB (SMC) surface-mount package, maintaining mechanical compatibility with the original CD214L-T70ALF. Tape & Reel (TR) packaging is standard across all active alternatives, suitable for automated assembly processes.

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