CD214A-T28CALF Equivalent & Substitute Parts

Part Overview

The CD214A-T28CALF 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 28V reverse standoff voltage with a 45.4V maximum clamping voltage and 8.8A peak pulse current capability in a DO-214AC (SMA) package. The part is currently obsolete, making equivalent and substitute components necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214A-T28CALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	28V
Voltage - Breakdown (Min)	31.1V
Voltage - Clamping (Max) @ Ipp	45.4V
Current - Peak Pulse (10/1000µs)	8.8A
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-T28CALF is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 28V to maintain circuit protection threshold
Voltage - Breakdown (Min): Must be 31.1V or higher to ensure consistent triggering
Voltage - Clamping (Max) @ Ipp: Must not exceed 45.4V to prevent overvoltage stress on protected components
Current - Peak Pulse (10/1000µs): Must be 8.8A or higher to handle transient events
Power - Peak Pulse: Must be 400W or higher for thermal management
Package / Case: Must be DO-214AC (SMA) for mechanical and electrical compatibility
Mounting Type: Must be Surface Mount for PCB assembly compatibility

Substitute parts are classified into two categories:

Direct Equivalents: Parts with identical electrical specifications across all critical parameters, differing only in manufacturer or packaging variant.

Similar Substitutes: Parts with the same reverse standoff voltage (28V) and compatible clamping characteristics but with variations in peak pulse current, clamping voltage, or power dissipation. These parts provide functional protection but with different performance envelopes.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package	Product Status
CD214A-T28CALF	Bourns Inc.	28V	31.1V	45.4V	8.8A	400W	DO-214AC (SMA)	Obsolete
SMAJ28CA	MDD	28V	31.1V	45.4V	8.8A	400W	DO-214AC (SMA)	Active
SMAJ28CA-TP	Micro Commercial Co	28V	31.1V	45.4V	8.8A	400W	DO-214AC (SMA)	Active
SMAJ28CA-TR	STMicroelectronics	28V	31.1V	59V	39A (8/20µs)	400W	DO-214AC (SMA)	Active
SMA6J28CA-TR	STMicroelectronics	28V	31.1V	51.6V	68A (8/20µs)	600W	DO-214AC (SMA)	Active
SM4T33CAY	STMicroelectronics	28V	31.1V	59V	39A (8/20µs)	400W	DO-214AC (SMA)	Active
SMAJ26CA-M3/5A	Vishay General Semiconductor - Diodes Division	26V	28.9V	42.1V	9.5A	400W	DO-214AC (SMA)	Active
SMAJ30CA-M3/5A	Vishay General Semiconductor - Diodes Division	30V	33.3V	48.4V	8.3A	400W	DO-214AC (SMA)	Active
SMAJ30CA-M3/61	Vishay General Semiconductor - Diodes Division	30V	33.3V	48.4V	8.3A	400W	DO-214AC (SMA)	Active
SZ1SMA28CAT3G	Littelfuse Inc.	28V	31.1V	45.4V	8.8A	400W	DO-214AC (SMA)	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents)

SMAJ28CA (MDD), SMAJ28CA-TP (Micro Commercial Co), and SZ1SMA28CAT3G (Littelfuse Inc.) are direct electrical equivalents to the CD214A-T28CALF. All three maintain identical reverse standoff voltage (28V), breakdown voltage (31.1V), clamping voltage (45.4V), peak pulse current (8.8A), and power dissipation (400W). These parts are in active production status and ROHS3 compliant. SZ1SMA28CAT3G includes automotive-grade qualification (AEC-Q101) and extended temperature range (-65°C to 150°C), providing additional design margin for temperature-sensitive applications.

Secondary Substitutes (Compatible Performance)

SMAJ28CA-TR and SM4T33CAY (both STMicroelectronics) maintain the 28V reverse standoff voltage and 31.1V breakdown voltage but feature higher clamping voltage (59V) and significantly higher peak pulse current (39A at 8/20µs). These parts are suitable for applications requiring enhanced transient suppression capability. Both are TRANSIL™ series components in active production.

SMA6J28CA-TR (STMicroelectronics) provides the highest performance envelope with 28V reverse standoff, 51.6V clamping voltage, 68A peak pulse current (8/20µs), and 600W power dissipation. This part is appropriate for high-energy transient environments.

Voltage-Variant Substitutes

SMAJ26CA-M3/5A (Vishay) and SMAJ30CA-M3/5A or SMAJ30CA-M3/61 (Vishay) offer alternative voltage ratings. SMAJ26CA-M3/5A operates at 26V reverse standoff with 42.1V clamping and 9.5A peak pulse current. SMAJ30CA variants operate at 30V reverse standoff with 48.4V clamping and 8.3A peak pulse current. These parts are suitable only when circuit protection thresholds can accommodate the voltage deviation.

All recommended substitutes are ROHS3 compliant and available in DO-214AC (SMA) surface-mount packages.

Frequently Asked Questions (FAQ)

Q: Can SMAJ28CA-TR be used as a direct replacement for CD214A-T28CALF?

A: SMAJ28CA-TR is electrically compatible at the reverse standoff and breakdown voltage levels (28V and 31.1V respectively). However, it features a higher clamping voltage (59V versus 45.4V) and significantly higher peak pulse current (39A versus 8.8A). This part is suitable for applications where the higher clamping voltage does not compromise protected component ratings and where enhanced transient handling is beneficial or neutral.

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

A: Direct equivalents (SMAJ28CA, SMAJ28CA-TP, SZ1SMA28CAT3G) match all critical electrical parameters of the original part. Similar substitutes maintain the 28V reverse standoff voltage but vary in clamping voltage, peak pulse current, or power dissipation, offering different performance characteristics for specific application requirements.

Q: Is SZ1SMA28CAT3G suitable for automotive applications?

A: SZ1SMA28CAT3G carries AEC-Q101 automotive qualification and is rated for -65°C to 150°C operating temperature, making it appropriate for automotive and high-reliability applications. Other substitutes lack explicit automotive qualification.

Q: Can SMAJ26CA-M3/5A or SMAJ30CA variants be used instead of the 28V-rated original?

A: These parts have different reverse standoff voltages (26V and 30V respectively) and should only be used if circuit protection thresholds can accommodate the voltage deviation. Using a 26V part in a 28V circuit may trigger protection prematurely; using a 30V part may delay protection activation.

Q: Are all substitute parts available in the same package as the original?

A: All listed substitute parts are available in DO-214AC (SMA) surface-mount packages, ensuring mechanical and PCB assembly compatibility with the original CD214A-T28CALF.

Q: What is the significance of the peak pulse current specification?

A: Peak pulse current (measured at 10/1000µs or 8/20µs) indicates the maximum transient current the TVS diode can suppress. Higher peak pulse current ratings provide greater protection margin for high-energy transient events. The original part is rated at 8.8A; substitutes range from 8.3A to 68A depending on the selected variant.

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