CD214B-T28ALF Equivalent & Substitute Parts

Part Overview

The CD214B-T28ALF is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface mount applications. This component features a 28V reverse standoff voltage with a 45.4V maximum clamping voltage and 13.2A peak pulse current capability in the DO-214AA (SMB) package. 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)	28	V
Voltage - Breakdown (Min)	31.1	V
Voltage - Clamping (Max) @ Ipp	45.4	V
Current - Peak Pulse (10/1000µs)	13.2	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-55 to 150	°C (TJ)
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution for the CD214B-T28ALF is determined by the following critical parameters:

Voltage Rating Match: Reverse standoff voltage of 28V ± tolerance, breakdown voltage minimum of 31.1V, and clamping voltage maximum of 45.4V
Peak Pulse Current: Minimum 13.2A capability at 10/1000µs pulse width
Package Compatibility: DO-214AA (SMB) surface mount package
Power Dissipation: 600W peak pulse power rating
Unidirectional Configuration: Single channel TVS diode topology
Compliance: ROHS3 compliance and EAR99 classification

Substitute parts are grouped into two categories:

Direct Equivalents maintain identical electrical specifications (28V standoff, 45.4V clamp, 13.2-13.3A peak pulse) with active product status and full availability.

Similar Alternatives provide comparable voltage protection within acceptable engineering tolerances but may differ in peak pulse current, clamping voltage, or operating temperature range. These are suitable when exact parameter matching is not critical to the application.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Operating Temperature (°C)	Product Status	Package
CD214B-T28ALF	Bourns Inc.	28	45.4	13.2	-55 to 150	Obsolete	DO-214AA, SMB
SMBJ28A	MDD	28	45.4	13.3	-50 to 150	Active	DO-214AA, SMB
SMBJ28A-HRA	Littelfuse Inc.	28	45.4	13.3	-65 to 150	Active	DO-214AA, SMB
SMBJ28A-TP	Micro Commercial Co	28	45.4	13.2	-55 to 175	Active	DO-214AA, SMB
SMBJ28A-TR	STMicroelectronics	28	45.4	13.8	-55 to 150	Active	DO-214AA, SMB
SMBJ26A	EVVO Semi	26	42.1	14.3	-65 to 150	Active	DO-214AC, SMA
SMBJ30A-HRA	Littelfuse Inc.	30	48.4	12.4	-65 to 150	Active	DO-214AA, SMB
SMBJ30A-M3/52	Vishay General Semiconductor	30	48.4	12.4	-55 to 150	Active	DO-214AA, SMB
TPSMB30A	Littelfuse Inc.	25.6	41.4	14.7	-65 to 175	Active	DO-214AA, SMB

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents)

SMBJ28A (MDD), SMBJ28A-HRA (Littelfuse Inc.), SMBJ28A-TP (Micro Commercial Co), and SMBJ28A-TR (STMicroelectronics) are direct functional equivalents with matching 28V standoff and 45.4V clamping specifications. All are active products with ROHS3 compliance and EAR99 classification. Selection among these should prioritize availability and lead time. SMBJ28A-TP offers the widest operating temperature range (-55 to 175°C), suitable for extended temperature applications. SMBJ28A-HRA provides the lowest temperature rating (-65°C), beneficial for cold environment deployment.

Secondary Alternatives (Similar Voltage Ratings)

SMBJ26A (EVVO Semi) operates at 26V standoff with 42.1V clamping, representing a lower voltage protection tier. This part is suitable only when the application can tolerate reduced protection margins. Note the package differs (DO-214AC, SMA vs. DO-214AA, SMB).

SMBJ30A-HRA and SMBJ30A-M3/52 operate at 30V standoff with 48.4V clamping, providing higher voltage protection. These are appropriate for applications requiring increased overvoltage margin but should not be used as direct replacements without circuit re-evaluation.

TPSMB30A (Littelfuse Inc.) is an automotive-grade component (AEC-Q101 qualified) with 25.6V standoff and extended temperature range (-65 to 175°C). This part is suitable for automotive and high-reliability applications but operates at a lower voltage threshold than the original specification.

All substitute parts maintain ROHS3 compliance, EAR99 classification, and MSL Level 1 (unlimited moisture sensitivity).

Frequently Asked Questions (FAQ)

Q: Can SMBJ28A directly replace CD214B-T28ALF without circuit modification?

A: Yes. SMBJ28A matches the critical electrical parameters: 28V reverse standoff, 45.4V clamping voltage, and 13.3A peak pulse current. Both use DO-214AA (SMB) packaging. No circuit redesign is required for functional equivalence.

Q: What is the difference between SMBJ28A-HRA, SMBJ28A-TP, and SMBJ28A-TR?

A: All three maintain identical voltage ratings (28V standoff, 45.4V clamp). Differences exist in operating temperature range, manufacturer, and peak pulse current specification. SMBJ28A-TP supports -55 to 175°C; SMBJ28A-HRA supports -65 to 150°C; SMBJ28A-TR supports -55 to 150°C. Peak pulse current varies between 13.2A and 13.8A. Selection depends on thermal requirements and availability.

Q: Why is SMBJ26A listed as a substitute if the voltage rating differs?

A: SMBJ26A is classified as a similar alternative, not a direct equivalent. The 26V standoff and 42.1V clamping represent a lower protection tier. This part is suitable only when application requirements permit reduced overvoltage margin. Additionally, the package differs (SMA vs. SMB), requiring PCB layout modification.

Q: Can SMBJ30A-HRA or SMBJ30A-M3/52 be used instead of CD214B-T28ALF?

A: These parts operate at 30V standoff with 48.4V clamping, providing higher protection than the original 28V specification. They are not direct replacements and should only be used after circuit re-evaluation confirms that higher clamping voltage is acceptable. Peak pulse current is lower (12.4A vs. 13.2A).

Q: Is TPSMB30A suitable for non-automotive applications?

A: TPSMB30A is automotive-grade (AEC-Q101 qualified) but can be used in non-automotive designs. However, it operates at 25.6V standoff, below the original 28V specification. Use only when application requirements permit lower voltage protection thresholds.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and EAR99 classification, matching the environmental and regulatory status of the original CD214B-T28ALF.

Q: What is the significance of the DO-214AA (SMB) package specification?

A: DO-214AA (SMB) is the standard surface mount package for these TVS diodes. All primary substitutes use this identical package, ensuring direct PCB compatibility without layout modification. SMBJ26A uses DO-214AC (SMA), a different package requiring PCB redesign.

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