CD214B-T18ALF Equivalent & Substitute Parts

Part Overview

The CD214B-T18ALF 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 an 18V reverse standoff voltage and provides 29.2V clamping at peak pulse current. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214B-T18ALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
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)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the CD214B-T18ALF is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 18V
Voltage - Clamping (Max) @ Ipp: 29.2V
Current - Peak Pulse (10/1000µs): 20.5A minimum
Power - Peak Pulse: 600W
Package / Case: DO-214AA (SMB) or compatible surface mount package
Unidirectional Channels: 1
Type: Zener

Direct Equivalents maintain all critical electrical parameters within specification and use identical or compatible packaging. The SMBJ18A from EVVO Semi qualifies as a direct equivalent, offering matching voltage ratings, clamping characteristics, and peak pulse current specifications with active product status.

Similar Alternatives provide functional substitution for applications where minor deviations in electrical parameters are acceptable. Parts such as SMBJ16A-HRA, SMBJ17A, and SMBJ15A/54 operate within the general voltage protection range but with different standoff and clamping voltages, requiring circuit-level validation.

Parameter Comparison

Parameter	CD214B-T18ALF (Main)	SMBJ18A (EVVO Semi)	SMBJ16A-HRA (Littelfuse)	SMBJ17A (Meritek)	SMBJ15A/54 (Vishay)
Voltage - Reverse Standoff (Typ)	18V	18V	16V	17V	15V
Voltage - Breakdown (Min)	20V	20V	17.8V	18.9V	16.7V
Voltage - Clamping (Max) @ Ipp	29.2V	29.2V	26V	27.6V	24.4V
Current - Peak Pulse (10/1000µs)	20.5A	20.6A	23.1A	21.74A	24.6A
Power - Peak Pulse	600W	600W	600W	600W	600W
Operating Temperature	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Package / Case	DO-214AA, SMB	DO-214AC, SMA	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	RoHS non-compliant

Engineering Selection Recommendations

For Direct Replacement (Preferred): The SMBJ18A from EVVO Semi is the primary equivalent for the CD214B-T18ALF. It maintains identical voltage ratings (18V standoff, 29.2V clamping) and peak pulse current (20.6A), with ROHS3 compliance and active product status. The package transition from DO-214AA (SMB) to DO-214AC (SMA) requires PCB layout verification but maintains mechanical and electrical compatibility for surface mount assembly.

For Alternative Voltage Protection Levels: When circuit requirements permit deviation from the 18V standoff specification, SMBJ16A-HRA (Littelfuse) and SMBJ17A (Meritek) provide active alternatives with lower clamping voltages (26V and 27.6V respectively). Both maintain ROHS3 compliance and DO-214AA packaging. SMBJ15A/54 (Vishay) offers the lowest clamping voltage (24.4V) but carries RoHS non-compliant status, limiting suitability for new designs subject to environmental regulations.

Compliance Considerations: All recommended direct and similar alternatives maintain ROHS3 compliance except SMBJ15A/54. For applications requiring regulatory compliance, exclude SMBJ15A/54 from selection. All substitute parts carry EAR99 ECCN classification and HTSUS code 8541.10.0080, matching the original part's export and tariff status.

Frequently Asked Questions (FAQ)

Q: Can SMBJ18A replace CD214B-T18ALF directly in existing designs? A: SMBJ18A provides electrical equivalence with matching 18V standoff and 29.2V clamping specifications. The package change from DO-214AA (SMB) to DO-214AC (SMA) requires PCB footprint verification. Both packages are surface mount with similar thermal and mechanical characteristics, but land pattern dimensions differ slightly.

Q: What is the difference between DO-214AA and DO-214AC packages? A: DO-214AA (SMB) and DO-214AC (SMA) are both surface mount TVS diode packages with identical electrical performance. DO-214AC is slightly smaller. Substitution requires confirming PCB pad layout compatibility. Both packages support automated assembly and provide equivalent thermal performance for 600W peak pulse applications.

Q: Why are SMBJ16A-HRA and SMBJ17A listed as similar rather than direct equivalents? A: These parts operate at lower reverse standoff voltages (16V and 17V respectively) compared to the 18V specification of CD214B-T18ALF. While they provide overvoltage protection, they clamp at lower voltages (26V and 27.6V versus 29.2V). Selection requires circuit analysis to confirm the lower clamping voltage is acceptable for the protected circuit.

Q: Is SMBJ15A/54 suitable for new production designs? A: SMBJ15A/54 carries RoHS non-compliant status, making it unsuitable for new designs subject to environmental regulations. While electrically functional, its use is restricted to legacy product support or applications exempt from RoHS requirements. SMBJ18A (EVVO Semi) is the recommended alternative for compliant new designs.

Q: What inventory considerations apply to these substitutes? A: SMBJ18A (EVVO Semi) has the highest inventory availability at 35,100 pieces. SMBJ16A-HRA (Littelfuse) and SMBJ17A (Meritek) maintain 870 and 15,419 pieces respectively. CD214B-T18ALF original stock is limited to 935 pieces with obsolete status. For production continuity, transition to SMBJ18A is recommended.

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