CD214A-T24CALF Equivalent & Substitute Parts

Part Overview

The CD214A-T24CALF is a 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 obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214A-T24CALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Package / Case	DO-214AC, SMA
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
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CD214A-T24CALF is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 24V (exact match required)
Voltage - Breakdown (Min): 26.7V (exact match required)
Package / Case: DO-214AC, SMA (exact match required)
Mounting Type: Surface Mount (exact match required)
Bidirectional Channels: 1 (exact match required)

Secondary Compatibility Parameters:

Voltage - Clamping (Max) @ Ipp: 38.9V ±5V acceptable range
Current - Peak Pulse (10/1000µs): 10.3A minimum
Power - Peak Pulse: 400W minimum
Operating Temperature: -55°C to 150°C minimum range
RoHS Status: ROHS3 Compliant (required)
Moisture Sensitivity Level: 1 (Unlimited) preferred

Substitute parts are classified into two categories: Direct Equivalents (identical electrical and mechanical specifications) and Similar Parts (compatible voltage and package specifications with enhanced performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	Package
CD214A-T24CALF	Bourns Inc.	24V	26.7V	38.9V	10.3A	400W	-55°C ~ 150°C	Obsolete	DO-214AC, SMA
SMAJ24CA	MDD	24V	26.7V	38.9V	10.3A	400W	-50°C ~ 150°C	Active	DO-214AC, SMA
SMAJ24CA-TP	Micro Commercial Co	24V	26.7V	38.9V	10.3A	400W	-55°C ~ 175°C	Active	DO-214AC, SMA
SM4T28CAY	STMicroelectronics	24V	26.7V	50V	46A (8/20µs)	400W	-55°C ~ 150°C	Active	DO-214AC, SMA
SMA6J24CA-TR	STMicroelectronics	24V	26.7V	44.3V	80A (8/20µs)	600W	-55°C ~ 175°C	Active	DO-214AC, SMA
SMAJ24CA-TR	STMicroelectronics	24V	26.7V	50V	46A (8/20µs)	400W	-55°C ~ 150°C	Active	DO-214AC, SMA
SMAJ26CA-M3/5A	Vishay General Semiconductor - Diodes Division	26V	28.9V	42.1V	9.5A	400W	-55°C ~ 150°C	Active	DO-214AC, SMA
SMAJ28CA-M3/5A	Vishay General Semiconductor - Diodes Division	28V	31.1V	45.4V	8.8A	400W	-55°C ~ 150°C	Active	DO-214AC, SMA
SMAJ30CA-M3/5A	Vishay General Semiconductor - Diodes Division	30V	33.3V	48.4V	8.3A	400W	-55°C ~ 150°C	Active	DO-214AC, SMA
SMAJ30CA-M3/61	Vishay General Semiconductor - Diodes Division	30V	33.3V	48.4V	8.3A	400W	-55°C ~ 150°C	Active	DO-214AC, SMA

Engineering Selection Recommendations

Direct Equivalent Selection:

SMAJ24CA (MDD) and SMAJ24CA-TP (Micro Commercial Co) are direct electrical equivalents to the CD214A-T24CALF, matching all critical voltage and current parameters. Both parts are in active production status with ROHS3 compliance and MSL 1 rating. SMAJ24CA-TP offers an extended operating temperature range (-55°C ~ 175°C) compared to the original specification, providing additional thermal margin for demanding applications.

Enhanced Performance Alternatives:

SMA6J24CA-TR (STMicroelectronics) and SMAJ24CA-TR (STMicroelectronics) maintain the 24V reverse standoff voltage and DO-214AC package while offering higher peak pulse current ratings (80A and 46A respectively) and increased power dissipation capability (600W and 400W). These parts are suitable for applications requiring greater transient energy absorption within the same voltage class.

Higher Voltage Alternatives:

SMAJ26CA-M3/5A, SMAJ28CA-M3/5A, and SMAJ30CA-M3/5A from Vishay General Semiconductor provide voltage ratings above 24V with corresponding higher clamping voltages. These parts are applicable only in circuit designs where the protected circuit can tolerate higher clamping voltages and where the source impedance and transient characteristics permit operation at these elevated voltage levels.

All recommended substitutes maintain DO-214AC (SMA) package compatibility, surface-mount configuration, and ROHS3 compliance with MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can SMAJ24CA directly replace CD214A-T24CALF without circuit modification?

A: Yes. SMAJ24CA matches the CD214A-T24CALF in reverse standoff voltage (24V), breakdown voltage (26.7V), clamping voltage (38.9V), peak pulse current (10.3A), and package (DO-214AC, SMA). The only difference is the operating temperature minimum (-50°C vs -55°C), which is acceptable for most applications. No circuit changes are required.

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

A: Direct equivalents (SMAJ24CA, SMAJ24CA-TP) have identical electrical specifications to the original part. Similar parts (SMA6J24CA-TR, SMAJ24CA-TR) maintain the same voltage class and package but offer enhanced current handling or power dissipation. Similar parts are suitable only if the application can benefit from or tolerate the higher performance characteristics.

Q: Why are SMAJ26CA, SMAJ28CA, and SMAJ30CA listed as substitutes if they have different voltage ratings?

A: These parts are listed as available alternatives within the TVS diode family but are not direct substitutes. They are applicable only in circuit designs where the protected circuit voltage tolerance permits operation at higher clamping voltages (42.1V, 45.4V, and 48.4V respectively). Circuit redesign and validation are required before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory requirements of the original CD214A-T24CALF.

Q: What is the significance of the DO-214AC (SMA) package specification?

A: The DO-214AC package, commonly referred to as SMA, is a standardized surface-mount diode package. All substitute parts use this identical package, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes without modification.

Q: Can I use parts with higher peak pulse current ratings as direct replacements?

A: Yes, if the application circuit design permits. Parts with higher current ratings (such as SMA6J24CA-TR at 80A) are backward compatible with designs requiring lower current handling. The circuit will operate safely, though the higher-rated component represents over-specification for the application.

Q: What should I verify before implementing a substitute part?

A: Verify that the substitute part's reverse standoff voltage, breakdown voltage, and package type match the original specification. Confirm that the clamping voltage is within acceptable limits for the protected circuit. Validate that the operating temperature range covers your application environment. Confirm ROHS3 and MSL compliance for your supply chain requirements.

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