CD214B-T30ALF Equivalent & Substitute Parts

Part Overview

The CD214B-T30ALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface mount applications. This unidirectional Zener diode operates with a 30V reverse standoff voltage and 48.4V maximum clamping voltage, delivering 12.4A peak pulse current in a compact SMB (DO-214AA) 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	CD214B-T30ALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	30V
Voltage - Breakdown (Min)	33.3V
Voltage - Clamping (Max) @ Ipp	48.4V
Current - Peak Pulse (10/1000µs)	12.4A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the CD214B-T30ALF is determined by strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 30V
Voltage - Clamping (Max) @ Ipp: 48.4V
Current - Peak Pulse (10/1000µs): 12.4A
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Power - Peak Pulse: 600W

Direct Equivalents maintain all key electrical parameters and operating temperature range within the specified limits. These parts are functionally interchangeable with identical electrical performance.

Similar Substitutes maintain the core voltage and current ratings but may have minor variations in operating temperature range or peak pulse current specifications. These parts provide equivalent protection performance within the same package footprint.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Operating Temperature	Product Status	RoHS Status
CD214B-T30ALF	Bourns Inc.	30V	48.4V	12.4A	-55°C ~ 150°C	Obsolete	ROHS3 Compliant
SMBJ30A	MDD	30V	48.4V	12.4A	-55°C ~ 150°C	Active	RoHS Compliant
SMBJ30A-HRA	Littelfuse Inc.	30V	48.4V	12.4A	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ30A-M3/52	Vishay General Semiconductor - Diodes Division	30V	48.4V	12.4A	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ30A-TP	Micro Commercial Co	30V	48.4V	12.4A	-55°C ~ 175°C	Active	ROHS3 Compliant
SMBJ30A-TR	STMicroelectronics	30V	48.4V	13A	-55°C ~ 150°C	Active	ROHS3 Compliant
TV06B300J-G	Comchip Technology	30V	48.4V	12.4A	Not specified	Active	ROHS3 Compliant
SMBJ28A-HRA	Littelfuse Inc.	28V	45.4V	13.3A	-65°C ~ 150°C	Active	ROHS3 Compliant
TPSMB30A	Littelfuse Inc.	25.6V	41.4V	14.7A	-65°C ~ 175°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Direct Substitutes (Identical Electrical Performance):

SMBJ30A (MDD), SMBJ30A-HRA (Littelfuse Inc.), SMBJ30A-M3/52 (Vishay), SMBJ30A-TP (Micro Commercial Co), and SMBJ30A-TR (STMicroelectronics) are direct electrical equivalents with active product status. All maintain the 30V reverse standoff, 48.4V clamping voltage, and 12.4A peak pulse current specifications. These parts are available in production quantities and carry current RoHS compliance certifications.

Temperature Range Considerations:

SMBJ30A-HRA and SMBJ30A-TP offer extended lower operating temperature limits (-65°C and -55°C respectively) compared to the original CD214B-T30ALF (-55°C). SMBJ30A-TP additionally supports operation to 175°C, providing thermal margin for high-temperature applications.

Similar Substitutes (Voltage Derating Required):

SMBJ28A-HRA (Littelfuse Inc.) and TPSMB30A (Littelfuse Inc.) provide similar protection functionality but with reduced voltage ratings. SMBJ28A-HRA operates at 28V reverse standoff with 45.4V clamping, while TPSMB30A operates at 25.6V reverse standoff with 41.4V clamping. These parts are suitable only for applications where the lower voltage thresholds are acceptable.

Compliance Status:

All substitute parts maintain ROHS3 compliance. TPSMB30A carries AEC-Q101 automotive qualification, suitable for automotive-grade applications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ30A directly replace CD214B-T30ALF without circuit modification?

A: Yes. SMBJ30A maintains identical electrical parameters: 30V reverse standoff, 48.4V clamping voltage, 12.4A peak pulse current, and 600W peak pulse power. The SMB (DO-214AA) package footprint is identical, enabling direct PCB substitution.

Q: What is the difference between SMBJ30A from different manufacturers?

A: All SMBJ30A variants from MDD, Littelfuse, Vishay, Micro Commercial Co, and STMicroelectronics meet the same electrical specifications. Differences exist in operating temperature ranges, packaging formats (Tape & Reel vs. Cut Tape), and availability. Selection depends on supply chain requirements and thermal operating conditions.

Q: Is SMBJ28A-HRA a suitable replacement?

A: SMBJ28A-HRA is a similar substitute with reduced voltage ratings (28V reverse standoff, 45.4V clamping). It is suitable only if the application can tolerate lower voltage thresholds. Direct substitution without circuit analysis is not recommended.

Q: Why does TPSMB30A have different voltage specifications?

A: TPSMB30A operates at 25.6V reverse standoff with 41.4V clamping voltage, representing a different voltage class within the TVS diode family. It is not a direct equivalent and requires application-level voltage compatibility verification.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. TPSMB30A additionally qualifies for automotive applications under AEC-Q101.

Q: What packaging options are available for SMBJ30A substitutes?

A: Substitute parts are available in Tape & Reel (TR) and Cut Tape (CT) formats. SMBJ30A-TR from STMicroelectronics is supplied in Cut Tape & Digi-Reel format. Packaging selection depends on production volume and assembly equipment compatibility.

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