CD214A-T70ALF Equivalent & Substitute Parts

Part Overview

The CD214A-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 with 113V maximum clamping voltage and 4.6A peak pulse current capability in a DO-214AC (SMA) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214A-T70ALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	70V
Voltage - Breakdown (Min)	77.8V
Voltage - Clamping (Max) @ Ipp	113V
Current - Peak Pulse (10/1000µs)	4.6A
Power - Peak Pulse	400W
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the CD214A-T70ALF is determined by strict equivalence across the following critical parameters:

Primary Matching Criteria:

Reverse standoff voltage: 70V (±tolerance)
Clamping voltage: 113V (±tolerance)
Peak pulse current: 4.6A minimum
Package type: DO-214AC (SMA)
Mounting type: Surface Mount
Unidirectional configuration: 1 channel

Direct Equivalents maintain all primary parameters with identical electrical performance and are sourced from active manufacturers. These parts are pin-compatible and functionally interchangeable without circuit modification.

Similar Substitutes share the core voltage and package specifications but may vary in peak pulse current, clamping voltage tolerance, or operating temperature range. Selection of similar substitutes requires verification that the application tolerates the parameter variance.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	RoHS Status
CD214A-T70ALF	Bourns Inc.	70V	113V	4.6A	400W	-55°C ~ 150°C	Obsolete	ROHS3 Compliant
SMAJ70A	MDD	70V	113V	4.6A	400W	-50°C ~ 150°C	Active	ROHS3 Compliant
P4SMA82A	Eaton - Electronics Division	70.1V	113V	3.6A	400W	-55°C ~ 150°C	Active	RoHS Compliant
SM4T82AY	STMicroelectronics	70V	146V	16A (8/20µs)	400W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMA6J70A-TR	STMicroelectronics	70V	120V	27A (8/20µs)	600W	-55°C ~ 175°C	Active	ROHS3 Compliant
SMAJ64A-M3/5A	Vishay General Semiconductor - Diodes Division	64V	103V	3.9A	400W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMAJ64A-M3/61	Vishay General Semiconductor - Diodes Division	64V	103V	3.9A	400W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMAJ70A-M3/5A	Vishay General Semiconductor - Diodes Division	70V	113V	4.6A	400W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMAJ70A-M3/61	Vishay General Semiconductor - Diodes Division	70V	113V	4.6A	400W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMAJ70A-TP	Micro Commercial Co	70V	113V	4.6A	400W	-55°C ~ 175°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Choices):

SMAJ70A (MDD), SMAJ70A-M3/5A (Vishay), SMAJ70A-M3/61 (Vishay), and SMAJ70A-TP (Micro Commercial Co) are direct functional equivalents to the CD214A-T70ALF. All maintain identical reverse standoff voltage (70V), clamping voltage (113V), and peak pulse current (4.6A) specifications. These parts are sourced from active manufacturers with current production status and full ROHS3 compliance. Selection among these direct equivalents may be based on availability, packaging format (Tape & Reel variants available), and supplier lead time.

Similar Substitutes (Application-Dependent Selection):

P4SMA82A (Eaton) provides near-equivalent performance with marginally higher peak pulse current (3.6A) and identical clamping voltage (113V). This part is suitable for applications where the additional current margin provides design headroom.

SM4T82AY (STMicroelectronics) and SMA6J70A-TR (STMicroelectronics) offer higher current and power ratings (16A and 27A respectively) with elevated clamping voltages (146V and 120V). These parts are appropriate only for applications where the higher clamping voltage does not compromise circuit protection requirements. SM4T82AY carries AEC-Q101 automotive qualification.

SMAJ64A-M3/5A and SMAJ64A-M3/61 (Vishay) feature lower reverse standoff voltage (64V) and clamping voltage (103V). These parts are not suitable as direct substitutes for the CD214A-T70ALF and should be selected only when circuit design specifically requires 64V protection levels.

All recommended substitutes maintain DO-214AC (SMA) package compatibility, surface-mount configuration, and ROHS3 compliance status.

Frequently Asked Questions (FAQ)

Q: Can SMAJ70A directly replace CD214A-T70ALF without circuit modification?

A: Yes. SMAJ70A (MDD) is a direct functional equivalent with identical reverse standoff voltage (70V), clamping voltage (113V), peak pulse current (4.6A), and DO-214AC package. No circuit modification is required. Vishay variants SMAJ70A-M3/5A and SMAJ70A-M3/61 are also direct equivalents.

Q: What is the difference between SMAJ70A-M3/5A and SMAJ70A-M3/61?

A: Both parts are manufactured by Vishay with identical electrical specifications (70V standoff, 113V clamping, 4.6A peak pulse). The suffix designations indicate different packaging tape configurations and reel specifications. Electrical performance is equivalent; selection depends on assembly equipment compatibility and supplier availability.

Q: Why are SM4T82AY and SMA6J70A-TR listed as similar rather than direct substitutes?

A: These parts share the 70V reverse standoff voltage and DO-214AC package but feature significantly higher peak pulse current ratings (16A and 27A respectively) and elevated clamping voltages (146V and 120V). While they provide overvoltage protection at the same standoff level, the higher clamping voltage may alter circuit protection characteristics. Application-specific circuit analysis is required to confirm suitability.

Q: Is SMAJ64A-M3/5A compatible with CD214A-T70ALF?

A: No. SMAJ64A-M3/5A operates at 64V reverse standoff with 103V clamping voltage, compared to the CD214A-T70ALF specification of 70V standoff and 113V clamping. This part provides protection at a lower voltage threshold and is not a suitable substitute unless circuit design specifically requires 64V protection.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended direct equivalents (SMAJ70A variants) and most similar substitutes maintain ROHS3 compliance. P4SMA82A is RoHS Compliant. Verify compliance documentation for specific procurement requirements.

Q: What is the operating temperature range difference between CD214A-T70ALF and available substitutes?

A: CD214A-T70ALF operates from -55°C to 150°C (junction temperature). SMAJ70A (MDD) operates -50°C to 150°C, while SMAJ70A-TP and SMA6J70A-TR extend to -55°C to 175°C. For applications requiring the full -55°C lower limit, select SMAJ70A-M3/5A, SMAJ70A-M3/61, or SMAJ70A-TP.

Q: Can I use P4SMA82A as a substitute if higher current capability is needed?

A: P4SMA82A provides 3.6A peak pulse current versus the CD214A-T70ALF specification of 4.6A, with identical 113V clamping voltage. This represents a marginal increase suitable for applications requiring additional current margin while maintaining equivalent clamping performance. Verify that the 70.1V standoff voltage (versus 70V nominal) is acceptable for your circuit protection scheme.

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