CD214B-T15ALF Equivalent & Substitute Parts

Part Overview

The CD214B-T15ALF is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc. in the SMB (DO-214AA) package. This component is rated for 15V reverse standoff voltage with a 24.4V maximum clamping voltage and 24A peak pulse current, designed for general-purpose transient voltage suppression applications. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	15V	V
Voltage - Breakdown (Min)	16.7V	V
Voltage - Clamping (Max) @ Ipp	24.4V	V
Current - Peak Pulse (10/1000µs)	24A	A
Power - Peak Pulse	600W	W
Operating Temperature Range	-55°C to 150°C	°C (TJ)
Package / Case	DO-214AA, SMB	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the CD214B-T15ALF is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 15V
Voltage - Breakdown (Min): 16.7V
Voltage - Clamping (Max) @ Ipp: 24.4V
Current - Peak Pulse (10/1000µs): 24A minimum
Power - Peak Pulse: 600W
Package / Case: DO-214AA or DO-214AC (SMB or SMA)
Type: Zener, Unidirectional
Operating Temperature: -55°C minimum to 150°C maximum

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical specifications (15V standoff, 24.4V clamping, 24A+ peak pulse) in compatible packages (SMB/SMA), active product status, and equivalent or superior temperature ratings.

Similar Alternatives: Parts with minor deviations in clamping voltage (±1V), peak pulse current (±2A), or temperature range that remain functionally compatible within the application envelope while maintaining the same package form factor and electrical class.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Min (V)	Clamping Max (V)	Peak Pulse (A)	Power (W)	Package	Temp Range (°C)	Status
CD214B-T15ALF	Bourns Inc.	15	16.7	24.4	24	600	DO-214AA (SMB)	-55 to 150	Obsolete
SMBJ15A	EVVO Semi	15	16.7	24.4	24.6	600	DO-214AC (SMA)	-65 to 150	Active
SMBJ15A-TP	Micro Commercial Co	15	16.7	24.4	24	600	DO-214AA (SMB)	-55 to 175	Active
SMBJ15A-TR	STMicroelectronics	15	16.7	24.4	25.1	600	DO-214AA (SMB)	-55 to 150	Active
SACB15	Littelfuse Inc.	15	16.7	23.6	20	500	DO-214AA (SMB)	-55 to 150	Active
SMBJ16A-HR	Littelfuse Inc.	16	17.8	26	23.1	600	DO-214AA (SMB)	-65 to 150	Active
SMBJ16A-HRA	Littelfuse Inc.	16	17.8	26	23.1	600	DO-214AA (SMB)	-65 to 150	Active
SMBJ17A/54	Vishay General Semiconductor - Diodes Division	17	18.9	27.6	21.7	600	DO-214AA (SMB)	-55 to 150	Active

Engineering Selection Recommendations

Preferred Direct Equivalents:

SMBJ15A-TP (Micro Commercial Co) and SMBJ15A-TR (STMicroelectronics) are the closest functional equivalents to the CD214B-T15ALF. Both maintain identical standoff voltage (15V), breakdown voltage (16.7V), and clamping voltage (24.4V) specifications. SMBJ15A-TP offers extended temperature range (-55°C to 175°C) and SMB package compatibility. SMBJ15A-TR provides slightly higher peak pulse current (25.1A) with active product status and ROHS3 compliance. Both are available in high inventory quantities and carry active product status.

Alternative with Package Consideration:

SMBJ15A (EVVO Semi) provides electrical equivalence with identical clamping and standoff voltages but uses the DO-214AC (SMA) package instead of SMB. This part offers extended lower temperature rating (-65°C) and high inventory availability. Package compatibility must be verified for PCB layout and thermal management requirements.

Lower-Performance Alternative:

SACB15 (Littelfuse Inc.) maintains the 15V standoff voltage and SMB package but operates at reduced peak pulse current (20A) and lower peak pulse power (500W). This part is suitable only for applications with lower transient energy requirements.

Higher-Voltage Alternatives:

SMBJ16A-HR, SMBJ16A-HRA (Littelfuse Inc.), and SMBJ17A/54 (Vishay) provide higher standoff voltages (16V and 17V respectively) with correspondingly higher clamping voltages. These parts are suitable only for circuits designed to tolerate higher clamping voltages and are not direct substitutes for 15V-rated applications.

All recommended substitutes carry ROHS3 compliance and MSL 1 (Unlimited) ratings, matching the original part's environmental certifications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ15A (SMA package) be used as a direct replacement for CD214B-T15ALF (SMB package)?

A: SMBJ15A provides electrical equivalence but uses the DO-214AC (SMA) package instead of DO-214AA (SMB). While both are surface-mount packages with similar footprints, PCB layout and thermal design must be verified. SMA packages have slightly different lead geometry and thermal characteristics compared to SMB. Consult PCB design guidelines and thermal analysis before substitution.

Q: What is the difference between SMBJ15A-TP and SMBJ15A-TR?

A: Both parts maintain identical electrical specifications (15V standoff, 24.4V clamping). SMBJ15A-TP (Micro Commercial Co) offers extended temperature range to 175°C and SMB package. SMBJ15A-TR (STMicroelectronics) provides slightly higher peak pulse current (25.1A vs 24A) and is part of the SMBJ/TRANSIL™ series. Selection depends on temperature requirements and manufacturer preference.

Q: Why are SMBJ16A-HR and SMBJ17A/54 listed as alternatives if they have different voltage ratings?

A: These parts are listed as similar alternatives for reference only. They are not direct substitutes for 15V applications. SMBJ16A-HR operates at 16V standoff with 26V clamping, and SMBJ17A/54 operates at 17V standoff with 27.6V clamping. These higher-voltage parts are suitable only for circuits designed to tolerate elevated clamping voltages and are not interchangeable with the CD214B-T15ALF in 15V-rated designs.

Q: Is SACB15 a suitable replacement for the CD214B-T15ALF?

A: SACB15 maintains the 15V standoff voltage and SMB package but operates at reduced peak pulse current (20A vs 24A) and lower peak pulse power (500W vs 600W). This part is suitable only for applications with lower transient energy requirements. For circuits requiring full 24A pulse handling capability, SACB15 is not recommended.

Q: What compliance certifications should I verify when substituting parts?

A: All listed substitute parts carry ROHS3 compliance and MSL 1 (Unlimited) ratings, matching the original CD214B-T15ALF specifications. Verify REACH status and ECCN classification (all listed parts are EAR99) against your supply chain and export requirements. Confirm RoHS compliance status with your procurement department, as SMBJ17A/54 is listed as RoHS non-compliant.

Q: How do I determine which substitute is best for my application?

A: Selection criteria are: (1) Electrical specifications must match or exceed the original part's standoff voltage, breakdown voltage, clamping voltage, and peak pulse current; (2) Package compatibility (SMB vs SMA) must align with PCB design; (3) Operating temperature range must cover your application's thermal envelope; (4) Product status should be active for long-term availability; (5) Compliance certifications must meet your supply chain requirements.

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