CD214B-T12ALF Equivalent & Substitute Parts

Part Overview

The CD214B-T12ALF is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc. in the DO-214AA (SMB) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a 12V reverse standoff voltage and 19.9V maximum clamping voltage. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214B-T12ALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	12V
Voltage - Breakdown (Min)	13.3V
Voltage - Clamping (Max) @ Ipp	19.9V
Current - Peak Pulse (10/1000µs)	30.2A
Power - Peak Pulse	600W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the CD214B-T12ALF is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 12V
Voltage - Breakdown (Min): 13.3V
Voltage - Clamping (Max) @ Ipp: 19.9V
Current - Peak Pulse (10/1000µs): 30.2A
Power - Peak Pulse: 600W
Type: Zener, Unidirectional

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package / Case: DO-214AA (SMB) or equivalent surface mount package
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical specifications (12V standoff, 19.9V clamping, 30.2A peak pulse) in compatible surface mount packages. These parts are functionally interchangeable without circuit modification.

Similar Alternatives: Parts with comparable but slightly different electrical parameters (voltage or current ratings within acceptable tolerance ranges) that serve the same application function. These parts require engineering evaluation for specific circuit requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Product Status	Operating Temperature
CD214B-T12ALF	Bourns Inc.	12V	19.9V	30.2A	600W	DO-214AA, SMB	Obsolete	-55°C ~ 150°C
SMBJ12A	EVVO Semi	12V	19.9V	30.2A	600W	DO-214AC, SMA	Active	-65°C ~ 150°C
SACB12	Littelfuse Inc.	12V	19V	25A	500W	DO-214AA, SMB	Active	-55°C ~ 150°C
SMBJ12A-TP	Micro Commercial Co	12V	19.9V	30.2A	600W	DO-214AA, SMB	Active	-55°C ~ 175°C
SMBJ12A-TR	STMicroelectronics	12V	19.9V	31A	600W	DO-214AA, SMB	Active	-55°C ~ 150°C
SMBJ13A-M3/5B	Vishay General Semiconductor - Diodes Division	13V	21.5V	27.9A	600W	DO-214AA, SMB	Active	-55°C ~ 150°C
TPSMB15A	Littelfuse Inc.	12.8V	21.2V	28.8A	600W	DO-214AA, SMB	Active	-65°C ~ 175°C
TV06B120J-G	Comchip Technology	12V	19.9V	30.15A	600W	DO-214AA, SMB	Active	Not specified

Engineering Selection Recommendations

Recommended Direct Substitutes (Highest Compatibility):

SMBJ12A-TP (Micro Commercial Co) and SMBJ12A-TR (STMicroelectronics) are the preferred substitutes. Both maintain identical electrical specifications to the CD214B-T12ALF (12V standoff, 19.9V clamping, 30.2A peak pulse) in the DO-214AA (SMB) package. Both are active products with ROHS3 compliance and MSL 1 rating. SMBJ12A-TP offers extended operating temperature range (-55°C ~ 175°C) compared to the original part.

TV06B120J-G (Comchip Technology) provides equivalent electrical performance with 30.15A peak pulse specification in the DO-214AA (SMB) package. This part is active and ROHS3 compliant.

Alternative Substitutes (Acceptable with Application Review):

SMBJ12A (EVVO Semi) matches all electrical specifications but uses the DO-214AC (SMA) package instead of DO-214AA (SMB). PCB layout modification is required for this substitution. The part is active with extended temperature range (-65°C ~ 150°C).

SACB12 (Littelfuse Inc., SACB series) maintains the DO-214AA (SMB) package and identical standoff voltage (12V) but has reduced peak pulse current (25A vs. 30.2A) and lower peak pulse power (500W vs. 600W). This part is suitable only for applications with lower transient current requirements.

Not Recommended for Direct Substitution:

SMBJ13A-M3/5B (Vishay) and TPSMB15A (Littelfuse) have higher voltage ratings (13V and 12.8V standoff respectively) and different clamping voltages. These parts are suitable only for circuits designed for higher voltage suppression levels.

Frequently Asked Questions (FAQ)

Q: Can I use SMBJ12A (EVVO Semi) as a direct replacement for CD214B-T12ALF?

A: SMBJ12A provides identical electrical specifications but uses the DO-214AC (SMA) package instead of DO-214AA (SMB). The physical package dimensions differ, requiring PCB layout modification. If your PCB footprint is fixed for SMB, this substitution requires board redesign.

Q: What is the difference between DO-214AA (SMB) and DO-214AC (SMA) packages?

A: Both are surface mount packages for TVS diodes, but they have different physical dimensions and PCB footprints. DO-214AA (SMB) is larger than DO-214AC (SMA). Substitution between these packages requires PCB layout changes.

Q: Is SACB12 a suitable replacement for CD214B-T12ALF?

A: SACB12 maintains the same package (DO-214AA, SMB) and voltage rating (12V standoff) but has reduced peak pulse current (25A vs. 30.2A) and lower peak pulse power (500W vs. 600W). Use SACB12 only if your circuit requires less than 25A peak pulse current. For applications requiring the full 30.2A specification, use SMBJ12A-TP or SMBJ12A-TR instead.

Q: Why are SMBJ13A-M3/5B and TPSMB15A listed as similar alternatives rather than direct substitutes?

A: These parts have higher voltage ratings (13V and 12.8V standoff respectively) and different clamping voltages (21.5V and 21.2V). They are not electrically equivalent to the 12V/19.9V CD214B-T12ALF. Use these parts only if your circuit design specifically requires higher voltage suppression levels.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant and have MSL 1 (Unlimited) moisture sensitivity rating, matching the original CD214B-T12ALF specifications.

Q: What is the inventory status of substitute parts?

A: SMBJ12A-TP (Micro Commercial Co) has 3,384 pcs in stock. SMBJ12A-TR (STMicroelectronics) has 3,550 pcs in stock. TV06B120J-G (Comchip Technology) has 800 pcs in stock. SMBJ12A (EVVO Semi) has 6,345 pcs in stock. SACB12 (Littelfuse Inc.) has 4,100 pcs in stock. Verify current availability with your component supplier.

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