CD214A-T33CALF Equivalent & Substitute Parts

Part Overview

The CD214A-T33CALF is a bidirectional transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 33V reverse standoff voltage with a 53.3V maximum clamping voltage and 7.5A peak pulse current capability in a DO-214AC (SMA) package. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33	V
Voltage - Breakdown (Min)	36.7	V
Voltage - Clamping (Max) @ Ipp	53.3	V
Current - Peak Pulse (10/1000µs)	7.5	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AC, SMA	—
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the CD214A-T33CALF is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 33V
Voltage - Breakdown (Min): 36.7V
Voltage - Clamping (Max) @ Ipp: 53.3V
Current - Peak Pulse (10/1000µs): 7.5A
Power - Peak Pulse: 400W
Package / Case: DO-214AC, SMA
Type: Zener, Bidirectional
Operating Temperature: -55°C minimum to 150°C maximum

Substitute parts are classified into two categories:

Direct Equivalents match all critical electrical parameters and clamping voltage specifications, ensuring pin-for-pin and functional compatibility without design modification.

Similar Alternatives maintain the same reverse standoff voltage (33V) and package (DO-214AC/SMA) but may differ in clamping voltage, peak pulse current, or power dissipation. These parts are suitable when the application can tolerate higher clamping voltages or increased current handling capability.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Product Status	Package
CD214A-T33CALF	Bourns Inc.	33	53.3	7.5	400	-55 to 150	Obsolete	DO-214AC (SMA)
SMAJ33CA	Good-Ark Semiconductor	33	53.3	7.5	400	-55 to 150	Active	DO-214AC (SMA)
SMAJ33CA-TP	Micro Commercial Co	33	53.3	7.5	400	-55 to 175	Active	DO-214AC (SMA)
SZ1SMA33CAT3G	onsemi	33	53.3	7.5	400	-65 to 150	Active	DO-214AC (SMA)
SMAJ33CA-TR	STMicroelectronics	33	69.7	33	400	-55 to 150	Active	DO-214AC (SMA)
SM4T39CAY	STMicroelectronics	33	69.7	33	400	-55 to 150	Active	DO-214AC (SMA)
SMA6J33CA-TR	STMicroelectronics	33	60.8	57	600	-55 to 175	Active	DO-214AC (SMA)
SMAJ36CA-M3/5A	Vishay General Semiconductor - Diodes Division	36	58.1	6.9	400	-55 to 150	Active	DO-214AC (SMA)

Engineering Selection Recommendations

Direct Replacement (No Design Changes Required):

SMAJ33CA (Good-Ark Semiconductor), SMAJ33CA-TP (Micro Commercial Co), and SZ1SMA33CAT3G (onsemi) are direct functional equivalents with identical electrical specifications. All three are active products with ROHS3 compliance and MSL 1 rating. SMAJ33CA-TP and SZ1SMA33CAT3G offer extended operating temperature ranges (-55 to 175°C and -65 to 150°C respectively), providing additional thermal margin. SZ1SMA33CAT3G includes AEC-Q101 automotive qualification.

Higher Performance Alternatives (Design Verification Required):

SMAJ33CA-TR and SM4T39CAY (both STMicroelectronics) maintain the 33V reverse standoff voltage but increase clamping voltage to 69.7V and peak pulse current to 33A. These parts are suitable for applications requiring enhanced transient suppression capability. SMA6J33CA-TR (STMicroelectronics) provides the highest performance with 60.8V clamping, 57A peak pulse current, and 600W power dissipation, with an extended temperature range to 175°C.

Voltage Class Alternative:

SMAJ36CA-M3/5A (Vishay) operates at 36V reverse standoff voltage instead of 33V. This part is suitable only if the application circuit can tolerate the higher voltage threshold.

All recommended substitutes maintain DO-214AC (SMA) package compatibility, ROHS3 compliance, and MSL 1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can I use SMAJ33CA-TR or SM4T39CAY as direct replacements for CD214A-T33CALF?

A: These parts share the same 33V reverse standoff voltage and DO-214AC package but feature higher clamping voltage (69.7V) and peak pulse current (33A). They are functionally compatible but will clamp transients at a higher voltage level. Circuit simulation or testing is necessary to confirm suitability for your specific application.

Q: What is the difference between SMAJ33CA and SMAJ33CA-TP?

A: Both parts have identical electrical specifications (33V standoff, 53.3V clamping, 7.5A peak pulse). SMAJ33CA-TP offers an extended operating temperature range to 175°C compared to 150°C for SMAJ33CA. Packaging differs: SMAJ33CA is available in Cut Tape and Digi-Reel formats, while SMAJ33CA-TP is supplied in Tape & Reel.

Q: Is SZ1SMA33CAT3G suitable for automotive applications?

A: Yes. SZ1SMA33CAT3G carries AEC-Q101 automotive qualification and an extended lower temperature rating (-65°C). It is suitable for automotive and industrial applications requiring enhanced reliability.

Q: Why does SMA6J33CA-TR have different electrical specifications?

A: SMA6J33CA-TR is a higher-performance variant with increased peak pulse current (57A) and power dissipation (600W), resulting in a higher clamping voltage (60.8V). This part is appropriate for applications requiring greater transient energy absorption. Circuit compatibility must be verified before substitution.

Q: Can I substitute SMAJ36CA-M3/5A for CD214A-T33CALF?

A: SMAJ36CA-M3/5A operates at 36V reverse standoff voltage, which is 3V higher than the original 33V specification. This part is suitable only if your circuit design permits operation at the higher voltage threshold. Direct substitution without circuit analysis is not recommended.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental compliance profile of the original CD214A-T33CALF.

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