CD214B-T54ALF Equivalent & Substitute Parts

Part Overview

The CD214B-T54ALF is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface mount applications. This component features a 54V reverse standoff voltage with an 87.1V maximum clamping voltage and 6.9A peak pulse current capability in the DO-214AA (SMB) package format. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

CD214B-T54ALF

Bourns Inc.In Stock: 1187CD214B-T54ALF Datasheet

Current PartRFQ

SMBJ54A

MDDIn Stock: 3461SMBJ54A Datasheet

DirectRFQ

SMBJ54A

MDDIn Stock: 3461SMBJ54A Datasheet

DirectRFQ

SMBJ54A

MDDIn Stock: 3461SMBJ54A Datasheet

DirectRFQ

SMBJ51A-HR

Littelfuse Inc.In Stock: 1188SMBJ51A-HR Datasheet

SimilarRFQ

SMBJ54A-TP

Micro Commercial CoIn Stock: 3940SMBJ54A-TP Datasheet

SimilarRFQ

SZ1SMB51AT3G

Littelfuse Inc.In Stock: 9177SZ1SMB51AT3G Datasheet

SimilarRFQ

TV06B540J-G

Comchip TechnologyIn Stock: 999TV06B540J-G Datasheet

SimilarRFQ

TV06B540J-HF

Comchip TechnologyIn Stock: 989TV06B540J-HF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD214B-T54ALF is determined by strict electrical and mechanical parameter matching within the TVS diode category. The critical parameters that define substitutability are:

• Voltage - Reverse Standoff (Typ): 54V
• Voltage - Clamping (Max) @ Ipp: 87.1V
• Current - Peak Pulse (10/1000µs): 6.9A
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Substitute parts are classified into two categories:

Direct Equivalents maintain identical electrical specifications (54V standoff, 87.1V clamping, 6.9A peak pulse) with active product status and full compatibility.

Similar Alternatives provide comparable voltage protection with minor parameter variations (51V standoff, 82.4V clamping, 7.3A peak pulse) and are suitable where the exact 54V specification is not mandatory. These alternatives offer enhanced availability and active manufacturer support.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent Selection (Preferred for Pin-Compatible Replacement)

SMBJ54A (MDD) and SMBJ54A-TP (Micro Commercial Co) are direct electrical equivalents to the CD214B-T54ALF, maintaining identical 54V standoff voltage, 87.1V clamping voltage, and 6.9A peak pulse current specifications. Both parts are ROHS3 compliant, MSL 1 rated, and available in active production status. SMBJ54A-TP offers an extended operating temperature range to 175°C, providing additional thermal margin in high-temperature applications.

TV06B540J-HF and TV06B540J-G (Comchip Technology) provide direct electrical equivalence with 87.1V clamping and 6.89A peak pulse current. Both are ROHS3 compliant and actively manufactured.

Similar Alternative Selection (For Applications with Voltage Tolerance)

SMBJ51A-HR (Littelfuse Inc.) and SZ1SMB51AT3G (Littelfuse Inc.) operate at 51V standoff with 82.4V clamping voltage, representing a 3V reduction in standoff voltage and 4.7V reduction in clamping voltage. These alternatives are suitable for applications where the exact 54V specification is not critical. SZ1SMB51AT3G includes automotive-grade qualification (AEC-Q101) and extended temperature range (-65°C ~ 150°C), making it appropriate for automotive and harsh-environment applications. Both Littelfuse options provide superior long-term availability as active products from an established manufacturer.

Frequently Asked Questions (FAQ)

Q: Can SMBJ54A directly replace CD214B-T54ALF without circuit modification?

A: Yes. SMBJ54A maintains identical electrical specifications (54V standoff, 87.1V clamping, 6.9A peak pulse) and the same DO-214AA SMB package footprint. No circuit modifications are required for direct substitution.

Q: What is the difference between the 54V and 51V standoff voltage options?

A: The 54V standoff parts (SMBJ54A, SMBJ54A-TP, TV06B540J-HF, TV06B540J-G) trigger protection at a higher voltage threshold compared to the 51V standoff alternatives (SMBJ51A-HR, SZ1SMB51AT3G). Selection depends on the specific overvoltage threshold required by your circuit design. The 54V options provide closer matching to the original CD214B-T54ALF specification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and MSL 1 rated, meeting current environmental and reliability standards.

Q: Which substitute offers the best long-term availability?

A: SMBJ54A (MDD) and SZ1SMB51AT3G (Littelfuse) are actively manufactured by established component suppliers with strong market presence. Littelfuse parts, particularly SZ1SMB51AT3G, benefit from automotive-grade qualification and extended production support.

Q: Can I use SMBJ51A-HR in place of CD214B-T54ALF in a 54V protection circuit?

A: SMBJ51A-HR operates at 51V standoff voltage versus the original 54V specification. This 3V difference may be acceptable depending on your circuit's overvoltage tolerance and protection margin requirements. Verify that the lower threshold does not cause nuisance triggering in your application before implementation.

Q: What is the temperature operating range difference between substitutes?

A: CD214B-T54ALF operates -55°C ~ 150°C. SMBJ54A-TP extends to 175°C, while SMBJ51A-HR and SZ1SMB51AT3G extend to -65°C on the lower end. Select based on your application's thermal requirements.