CD214L-T28ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T28ALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., classified as a unidirectional Zener-type device in the DO-214AB (SMC) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a 28V reverse standoff voltage and 45.4V maximum clamping voltage at peak pulse current. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

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)	66	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the CD214L-T28ALF is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Reverse Standoff: 28V (typ)
Voltage - Clamping (Max) @ Ipp: 45.4V
Package / Case: DO-214AB (SMC)
Type: Zener, Unidirectional
Unidirectional Channels: 1

Secondary Compatibility Factors:

Current - Peak Pulse (10/1000µs): 66A or higher
Power - Peak Pulse: 3000W or higher
Operating Temperature Range: minimum -55°C to 150°C
RoHS3 Compliance

Substitute parts are grouped into two categories based on electrical performance:

Category A - Direct Electrical Equivalents (66A @ 3000W): Parts matching the exact peak pulse current and power dissipation specifications of the original device.

Category B - Enhanced Performance Substitutes (110A @ 5000W or higher): Parts with superior current handling and power dissipation capabilities, suitable for applications requiring additional margin or higher transient energy absorption.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Product Status
CD214L-T28ALF	Bourns Inc.	28	31.1	45.4	66	3000	-55 to 150	DO-214AB (SMC)	Obsolete
SMLJ28A	Bourns Inc.	28	31.1	45.4	66	3000	-55 to 150	DO-214AB (SMC)	Active
3.0SMCJ28A-13	Diodes Incorporated	28	31.1	45.4	66.1	3000	-55 to 175	DO-214AB (SMC)	Active
5.0SMDJ28A	Taiwan Semiconductor Corporation	28	31.1	45.4	110	5000	-55 to 175	DO-214AB (SMC)	Active
5.0SMDJ28A-T7	Littelfuse Inc.	28	31.1	45.4	110	5000	-65 to 150	DO-214AB (SMC)	Active
LNBTVS4-304S	STMicroelectronics	28	30	45	334 (8/20µs)	22500	-55 to 150	DO-214AB (SMC)	Active
LNBTVS6-304S	STMicroelectronics	28	30	45	500 (8/20µs)	22500	-55 to 150	DO-214AB (SMC)	Active
SMCJ28A	Meritek	28	31.1	45.4	33.04	1500	-55 to 150	DO-214AB (SMC)	Active
SMCJ28A-TP	Micro Commercial Co	28	31.1	45.4	33.1	1500	-55 to 175	DO-214AB (SMC)	Active
SMDJ28A	Alpha & Omega Semiconductor Inc.	28	31.1	45.4	66.1	3000	-55 to 150	DO-214AB (SMC)	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent: SMLJ28A (Bourns Inc.) is the preferred direct substitute. Manufactured by the same supplier as the original part, it maintains identical electrical specifications (28V standoff, 45.4V clamping, 66A peak pulse, 3000W power dissipation) and operates within the same temperature range (-55°C to 150°C). Active product status ensures long-term availability and supply chain continuity.

Secondary Recommendation - Cross-Manufacturer Equivalent: SMDJ28A (Alpha & Omega Semiconductor Inc.) provides equivalent electrical performance with identical voltage and power ratings. Active status and established supply availability support design continuity.

Enhanced Performance Option: 5.0SMDJ28A (Taiwan Semiconductor Corporation) or 5.0SMDJ28A-T7 (Littelfuse Inc.) offer superior transient energy absorption (110A peak pulse, 5000W power dissipation) while maintaining the same voltage specifications. These parts are suitable for applications requiring additional design margin or higher transient stress tolerance. Both manufacturers maintain active product status.

High-Energy Transient Applications: LNBTVS4-304S or LNBTVS6-304S (STMicroelectronics TRANSIL™ series) provide significantly higher peak pulse current handling (334A and 500A respectively at 8/20µs pulse) and power dissipation (22.5kW). These are appropriate for applications with severe transient voltage events or where enhanced protection margin is required.

Not Recommended: SMCJ28A and SMCJ28A-TP exhibit reduced peak pulse current (33A) and power dissipation (1500W) compared to the original specification. These parts are suitable only for applications with lower transient energy requirements and should not be used as direct replacements for the CD214L-T28ALF in designs requiring the full 66A / 3000W capability.

All recommended substitutes maintain RoHS3 compliance and are available in DO-214AB (SMC) surface mount packaging, ensuring mechanical and environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can SMLJ28A be used as a direct replacement for CD214L-T28ALF? A: Yes. SMLJ28A is electrically and mechanically equivalent, with identical voltage ratings (28V standoff, 45.4V clamping), peak pulse current (66A), and power dissipation (3000W). Both operate across -55°C to 150°C and use the DO-214AB (SMC) package. SMLJ28A is manufactured by Bourns Inc. and maintains active product status.

Q: What is the difference between 3000W and 5000W rated parts? A: Power rating indicates the maximum transient energy the device can safely dissipate during a single pulse event. The 3000W parts (CD214L-T28ALF, SMLJ28A, SMDJ28A) are rated for standard transient suppression. The 5000W parts (5.0SMDJ28A, 5.0SMDJ28A-T7) provide additional energy absorption capacity, suitable for applications with higher transient stress or where design margin is required.

Q: Are LNBTVS4-304S and LNBTVS6-304S compatible with the original design? A: These parts maintain the same voltage specifications (28V standoff, 45V clamping) and package (DO-214AB SMC), but feature significantly higher peak pulse current ratings (334A and 500A respectively) and power dissipation (22.5kW). They are mechanically and electrically compatible but provide enhanced protection capability. Use is appropriate when higher transient energy absorption is required or beneficial.

Q: Why is SMCJ28A not recommended as a direct replacement? A: SMCJ28A has reduced peak pulse current (33.04A) and power dissipation (1500W) compared to the original CD214L-T28ALF specification (66A, 3000W). While voltage ratings are identical, the lower current and power ratings make it unsuitable for applications requiring the full transient suppression capability of the original part.

Q: Do all substitute parts have the same operating temperature range? A: No. Most substitutes operate from -55°C to 150°C or -55°C to 175°C. The 5.0SMDJ28A-T7 extends the lower temperature limit to -65°C. Verify the operating temperature range of the selected substitute matches application requirements.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain RoHS3 compliance, ensuring environmental and regulatory compatibility with the original CD214L-T28ALF.

Q: What is the difference between 10/1000µs and 8/20µs pulse specifications? A: These represent different standard test pulse waveforms used to characterize TVS diode performance. The 10/1000µs waveform is typical for general-purpose transient suppression, while 8/20µs is a standard telecom and power line surge waveform. Parts specified with different pulse waveforms may exhibit different peak current ratings for the same voltage class. Verify pulse waveform compatibility with application requirements.

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