CD214B-T18CALF Equivalent & Substitute Parts

Part Overview

The CD214B-T18CALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface mount applications. This component features an 18V reverse standoff voltage with a 29.2V maximum clamping voltage and 20.5A peak pulse current capability in the DO-214AA (SMB) package format. The part is currently listed as obsolete, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	CD214B-T18CALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Package / Case	DO-214AA, SMB
Voltage - Reverse Standoff (Typ)	18V
Voltage - Breakdown (Min)	20V
Voltage - Clamping (Max) @ Ipp	29.2V
Current - Peak Pulse (10/1000µs)	20.5A
Power - Peak Pulse	600W
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 eligibility for the CD214B-T18CALF is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 18V
Voltage - Clamping (Max) @ Ipp: 29.2V
Current - Peak Pulse (10/1000µs): 20.5A minimum
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Power - Peak Pulse: 600W

Direct substitutes maintain identical electrical specifications across all key parameters. Similar alternatives may deviate in reverse standoff voltage or peak pulse current within acceptable application ranges but retain the same package format and power rating. All substitute candidates are evaluated based on active product status and compliance certifications to ensure long-term availability and regulatory conformance.

Parameter Comparison

Parameter	CD214B-T18CALF (Bourns)	SMBJ18CA (MDD)	SMBJ15CA (EVVO Semi)	SMBJ16CA (EVVO Semi)	SMBJ15CA-M3/52 (Vishay)
Voltage - Reverse Standoff (Typ)	18V	18V	15V	16V	15V
Voltage - Breakdown (Min)	20V	20V	16.7V	17.8V	16.7V
Voltage - Clamping (Max) @ Ipp	29.2V	29.2V	24.4V	26V	24.4V
Current - Peak Pulse (10/1000µs)	20.5A	20.6A	24.6A	23.1A	24.6A
Power - Peak Pulse	600W	600W	600W	600W	600W
Operating Temperature	-55°C ~ 150°C (TJ)	-50°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB	SMB/DO-214AA	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The SMBJ18CA manufactured by MDD represents the primary direct substitute for the CD214B-T18CALF. This part maintains identical electrical specifications including 18V reverse standoff voltage, 29.2V clamping voltage, and 20.6A peak pulse current. The SMBJ18CA is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating, ensuring regulatory conformance and long-term supply availability.

The SMBJ15CA (EVVO Semi) and SMBJ15CA-M3/52 (Vishay) are similar alternatives suitable for applications where a lower reverse standoff voltage of 15V is acceptable. These parts provide higher peak pulse current capability (24.6A) and extended operating temperature range (-65°C minimum), offering enhanced performance margins in certain thermal environments.

The SMBJ16CA (EVVO Semi) provides an intermediate voltage option with 16V reverse standoff and 26V clamping voltage, applicable where the original 18V specification can be relaxed within circuit design tolerances.

All recommended substitutes maintain the DO-214AA (SMB) package format, 600W peak pulse power rating, and surface mount configuration, ensuring mechanical and thermal compatibility with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can SMBJ18CA be used as a direct replacement for CD214B-T18CALF?

A: Yes. The SMBJ18CA matches all critical electrical parameters: 18V reverse standoff voltage, 29.2V clamping voltage, 20.6A peak pulse current, and 600W power rating. Both use the DO-214AA (SMB) package. The SMBJ18CA is in active production with ROHS3 compliance, making it the preferred direct substitute.

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

A: Direct substitutes (SMBJ18CA) maintain identical reverse standoff and clamping voltages. Similar alternatives (SMBJ15CA, SMBJ16CA) operate at lower voltage ratings but retain the same package, power rating, and general-purpose application category. Selection depends on circuit voltage tolerance requirements.

Q: Are lower voltage alternatives (SMBJ15CA, SMBJ16CA) suitable for 18V standoff applications?

A: Lower voltage TVS diodes will clamp at lower voltages than the original specification. Use only if circuit design permits reduced clamping voltage thresholds. Verify that the lower clamping voltage does not compromise downstream component protection.

Q: Does the operating temperature range difference affect substitution?

A: The SMBJ18CA operates from -50°C to 150°C versus the original -55°C to 150°C. For applications requiring operation below -50°C, the original specification or alternatives with -55°C or -65°C minimum ratings should be confirmed. Most general-purpose applications operate within the -50°C to 150°C range.

Q: Are all recommended substitutes RoHS compliant?

A: Yes. All recommended substitutes carry ROHS3 compliance certification, matching the original CD214B-T18CALF compliance status.

Q: What is the package compatibility between substitutes?

A: All substitutes use the DO-214AA (SMB) package format, ensuring direct PCB footprint compatibility with the original design. No layout modifications are required.

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