CD214A-T24ALF Equivalent & Substitute Parts

Part Overview

The CD214A-T24ALF 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 24V reverse standoff voltage with a 38.9V maximum clamping voltage and 10.3A peak pulse current capability in a DO-214AC (SMA) package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	24	V
Voltage - Breakdown (Min)	26.7	V
Voltage - Clamping (Max) @ Ipp	38.9	V
Current - Peak Pulse (10/1000µs)	10.3	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution for the CD214A-T24ALF is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 24V
Voltage - Breakdown (Min): 26.7V
Voltage - Clamping (Max) @ Ipp: 38.9V
Current - Peak Pulse (10/1000µs): 10.3A
Power - Peak Pulse: 400W
Package / Case: DO-214AC, SMA
Type: Zener, Unidirectional
RoHS Status: ROHS3 Compliant

Substitute parts are categorized into two groups:

Direct Equivalents: Parts with identical electrical specifications (24V standoff, 26.7V breakdown, 38.9V clamping, 10.3A peak pulse, 400W power rating) and matching package type. These parts provide pin-for-pin and functionally equivalent replacement.

Similar Alternatives: Parts with the same 24V standoff voltage and DO-214AC package but with variations in clamping voltage, peak pulse current, or power rating. These parts are suitable when the application can tolerate higher clamping voltages or peak pulse current ratings.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Voltage (V)	Clamping Voltage (V)	Peak Pulse Current (A)	Power Rating (W)	Package	Product Status
CD214A-T24ALF	Bourns Inc.	24	26.7	38.9	10.3	400	DO-214AC, SMA	Obsolete
SMAJ24A	MDD	24	26.7	38.9	10.3	400	DO-214AC, SMA	Active
SZ1SMA24AT3G	Littelfuse Inc.	24	26.7	38.9	10.3	400	DO-214AC, SMA	Active
TV04A240J-G	Comchip Technology	24	26.7	38.9	10.28	400	DO-214AC, SMA	Active
SMA6J24A-TP	Micro Commercial Co	24	26.7	38.9	15.4	600	DO-214AC, SMA	Active
SMA6J24A-TR	STMicroelectronics	24	26.7	44.3	80	600	DO-214AC, SMA	Active
SMAJ24A-TR	STMicroelectronics	24	26.7	50	46	400	DO-214AC, SMA	Active
SM4T28AY	STMicroelectronics	24	26.7	50	46 (8/20µs)	400	DO-214AC, SMA	Active
SMAJ30A-M3/5A	Vishay General Semiconductor - Diodes Division	30	33.3	48.4	8.3	400	DO-214AC, SMA	Active
SMAJ30A-M3/61	Vishay General Semiconductor - Diodes Division	30	33.3	48.4	8.3	400	DO-214AC, SMA	Active

Engineering Selection Recommendations

Direct Replacement (Preferred for Obsolescence Mitigation):

SMAJ24A (MDD), SZ1SMA24AT3G (Littelfuse Inc.), and TV04A240J-G (Comchip Technology) are direct electrical equivalents with identical standoff voltage, breakdown voltage, clamping voltage, and peak pulse current specifications. All three are active products with ROHS3 compliance and MSL 1 rating. SMAJ24A offers the highest inventory availability (21,098 pcs). SZ1SMA24AT3G carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

Higher Performance Alternatives:

SMA6J24A-TP (Micro Commercial Co) and SMA6J24A-TR (STMicroelectronics) maintain the 24V standoff voltage and 38.9V clamping specification but provide increased peak pulse current (15.4A and 80A respectively) and higher power dissipation (600W). These are suitable when the application requires enhanced transient protection margin.

SMAJ24A-TR (STMicroelectronics) and SM4T28AY (STMicroelectronics) offer 50V clamping voltage with significantly higher peak pulse current (46A), providing superior protection for circuits tolerating higher clamping voltages.

Not Recommended for Direct Substitution:

SMAJ30A-M3/5A and SMAJ30A-M3/61 (Vishay) feature 30V standoff voltage and 33.3V breakdown voltage, which exceed the CD214A-T24ALF specification. These parts are suitable only when circuit design permits higher standoff voltage operation.

Frequently Asked Questions (FAQ)

Q: Can SMAJ24A directly replace CD214A-T24ALF?

A: Yes. SMAJ24A matches all critical electrical parameters: 24V standoff voltage, 26.7V breakdown voltage, 38.9V clamping voltage, 10.3A peak pulse current, and 400W power rating. Both use DO-214AC (SMA) packaging. SMAJ24A is an active product with ROHS3 compliance.

Q: What is the difference between direct equivalents and similar alternatives?

A: Direct equivalents (SMAJ24A, SZ1SMA24AT3G, TV04A240J-G) have identical electrical specifications to the CD214A-T24ALF. Similar alternatives (SMA6J24A-TP, SMA6J24A-TR, SMAJ24A-TR, SM4T28AY) maintain the 24V standoff voltage but offer higher clamping voltages or peak pulse currents, providing enhanced protection at the cost of higher transient voltage clamping.

Q: Is SZ1SMA24AT3G suitable for automotive applications?

A: Yes. SZ1SMA24AT3G carries AEC-Q101 automotive qualification and is rated for automotive-grade reliability. It matches all electrical specifications of the CD214A-T24ALF and is suitable for automotive circuit protection applications.

Q: Can I use SMAJ30A parts as substitutes?

A: SMAJ30A-M3/5A and SMAJ30A-M3/61 are not direct substitutes. These parts feature 30V standoff voltage and 33.3V breakdown voltage, which are higher than the CD214A-T24ALF specification (24V standoff, 26.7V breakdown). Use only if circuit design permits operation at higher standoff voltages.

Q: What packaging options are available for substitutes?

A: All listed substitute parts use DO-214AC (SMA) surface-mount packaging, matching the CD214A-T24ALF package type. Packaging variants include Cut Tape (CT), Digi-Reel®, and Tape & Reel (TR) options depending on the specific part number and manufacturer.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the environmental compliance of the CD214A-T24ALF.

Q: Which substitute offers the best inventory availability?

A: SMAJ24A (MDD) offers the highest inventory availability at 21,098 pcs in stock, followed by SZ1SMA24AT3G (Littelfuse Inc.) at 20,300 pcs.

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