CD214B-T17ALF Equivalent & Substitute Parts

Part Overview

The CD214B-T17ALF 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 features a 17V reverse standoff voltage with a 27.6V maximum clamping voltage and 21.7A peak pulse current capability in the DO-214AA (SMB) package. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214B-T17ALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	17V
Voltage - Breakdown (Min)	18.9V
Voltage - Clamping (Max) @ Ipp	27.6V
Current - Peak Pulse (10/1000µs)	21.7A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the CD214B-T17ALF is determined by strict electrical and mechanical compatibility across the following parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 17V
Voltage - Clamping (Max) @ Ipp: 27.6V
Current - Peak Pulse (10/1000µs): 21.7A (±tolerance)
Package / Case: DO-214AA (SMB)
Mounting Type: Surface Mount
Type: Zener, Unidirectional

Substitute Categories:

Direct Equivalents maintain all critical electrical parameters within specification tolerance and identical package configuration. These parts are pin-for-pin and functionally interchangeable without circuit modification.

Similar Alternatives maintain the same package and mounting type but operate at adjacent voltage ratings (15V or 16V standoff). These parts are suitable for applications where the exact 17V rating is not mandatory and the lower clamping voltage provides adequate protection margins.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Package / Case	Operating Temperature	Product Status	RoHS Status
CD214B-T17ALF	Bourns Inc.	17V	27.6V	21.7A	DO-214AA, SMB	-55°C ~ 150°C	Obsolete	ROHS3 Compliant
SMBJ17A	Meritek	17V	27.6V	21.74A	DO-214AA (SMB)	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ17A-TP	Micro Commercial Co	17V	27.6V	21.7A	DO-214AA, SMB	-55°C ~ 175°C	Active	ROHS3 Compliant
TV06B170J-G	Comchip Technology	17V	27.6V	21.74A	DO-214AA, SMB	Not specified	Active	ROHS3 Compliant
SMBJ16A-HRA	Littelfuse Inc.	16V	26V	23.1A	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ16A-HR	Littelfuse Inc.	16V	26V	23.1A	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ15A	EVVO Semi	15V	24.4V	24.6A	DO-214AC, SMA	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ15A/54	Vishay General Semiconductor - Diodes Division	15V	24.4V	24.6A	DO-214AA, SMB	-55°C ~ 150°C	Active	RoHS non-compliant
TPSMB18A	Littelfuse Inc.	15.3V	25.5V	24.2A	DO-214AA, SMB	-65°C ~ 175°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

First Priority - Direct Electrical & Package Match:

SMBJ17A (Meritek) and SMBJ17A-TP (Micro Commercial Co) are the primary substitutes for CD214B-T17ALF. Both maintain identical reverse standoff voltage (17V), clamping voltage (27.6V), and peak pulse current specifications within tolerance. Both are available in DO-214AA (SMB) package and are ROHS3 compliant. SMBJ17A-TP offers extended operating temperature range (-55°C ~ 175°C) compared to the original part (-55°C ~ 150°C), providing additional thermal margin for demanding applications.

TV06B170J-G (Comchip Technology) provides equivalent electrical performance with identical voltage and current ratings in the same package. This part is ROHS3 compliant and active in production.

Secondary Priority - Adjacent Voltage Rating:

SMBJ16A-HRA and SMBJ16A-HR (Littelfuse Inc.) operate at 16V reverse standoff with 26V clamping voltage. These parts are suitable for applications where 17V protection is not strictly required and lower clamping voltage is acceptable. Both are ROHS3 compliant with extended temperature range (-65°C ~ 150°C) and available in DO-214AA (SMB) package.

Tertiary Priority - Lower Voltage Rating:

SMBJ15A/54 (Vishay General Semiconductor - Diodes Division) operates at 15V reverse standoff in DO-214AA (SMB) package. This part is active and suitable for applications with lower voltage thresholds. Note: This part is RoHS non-compliant, which may restrict use in regulated environments.

SMBJ15A (EVVO Semi) operates at 15V reverse standoff but is packaged in DO-214AC (SMA), which differs from the original SMB package and requires PCB layout modification.

TPSMB18A (Littelfuse Inc.) is an automotive-grade part (AEC-Q101 qualified) with 15.3V reverse standoff and extended temperature range (-65°C ~ 175°C). This part is suitable for automotive applications requiring higher temperature performance.

Frequently Asked Questions (FAQ)

Q: Can SMBJ17A directly replace CD214B-T17ALF without circuit modification?

A: Yes. SMBJ17A maintains identical electrical specifications (17V standoff, 27.6V clamping, 21.7A peak pulse) and is packaged in the same DO-214AA (SMB) configuration. No circuit changes are required for direct substitution.

Q: What is the difference between SMBJ17A and SMBJ17A-TP?

A: Both parts have identical electrical ratings. SMBJ17A-TP offers extended maximum operating temperature of 175°C versus 150°C for standard SMBJ17A. Select SMBJ17A-TP for applications requiring higher thermal performance.

Q: Can I use SMBJ16A-HRA as a substitute?

A: SMBJ16A-HRA is a similar alternative with 16V reverse standoff and 26V clamping voltage. It is suitable only if your circuit design permits operation at these lower voltage thresholds. The part is pin-compatible in the same SMB package but provides different protection characteristics.

Q: Why is SMBJ15A listed as a similar alternative if the voltage rating is significantly lower?

A: SMBJ15A is included for applications where lower voltage protection is acceptable. However, note that SMBJ15A (EVVO Semi) uses DO-214AC (SMA) package, requiring PCB layout changes. SMBJ15A/54 (Vishay) uses the correct DO-214AA (SMB) package but is RoHS non-compliant.

Q: What does "RoHS non-compliant" mean for SMBJ15A/54?

A: RoHS non-compliance indicates the part may contain restricted substances. This designation may prevent use in applications subject to RoHS regulations or customer requirements. Verify compliance requirements before selecting this part.

Q: Is TPSMB18A suitable for general-purpose applications?

A: TPSMB18A is specifically qualified for automotive applications (AEC-Q101). While electrically compatible in the SMB package, it is optimized for automotive environments. Use in general-purpose applications is possible but not recommended unless automotive-grade reliability is required.

Q: What package compatibility issues should I consider?

A: The original CD214B-T17ALF uses DO-214AA (SMB) package. All recommended direct substitutes maintain this package. SMBJ15A (EVVO Semi) uses DO-214AC (SMA) package, which has different pin spacing and requires PCB modification. Verify package footprint compatibility before selection.

Q: Are all substitute parts ROHS3 compliant?

A: Most substitutes are ROHS3 compliant. Exception: SMBJ15A/54 (Vishay) is RoHS non-compliant. Verify compliance status against your regulatory requirements before final selection.

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