CD214C-T28ALF Equivalent & Substitute Parts

Part Overview

The CD214C-T28ALF is a 28V Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., rated for 45.4V clamping voltage and 33A peak pulse current in a surface mount DO-214AB (SMC) package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

TVS diodes in this voltage class are used for transient suppression in general-purpose applications requiring protection against voltage spikes and ESD events. The obsolete status of the CD214C-T28ALF necessitates identification of functionally equivalent alternatives from active manufacturers.

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)	33	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the CD214C-T28ALF is determined by the following critical parameters:

Voltage - Reverse Standoff: 28V (exact match required)
Voltage - Clamping (Max) @ Ipp: 45.4V (exact match required)
Package / Case: DO-214AB, SMC (exact match required)
Type: Zener, Unidirectional (exact match required)
Current - Peak Pulse (10/1000µs): 33A minimum (equal or greater acceptable)
Power - Peak Pulse: 1500W minimum (equal or greater acceptable)
Operating Temperature: -55°C to 150°C minimum (equal or greater range acceptable)
RoHS Status: ROHS3 Compliant (required for regulatory compliance)
Mounting Type: Surface Mount (exact match required)

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical specifications (voltage, current, power ratings) and active product status.

Similar Alternatives: Parts with higher current or power ratings, extended temperature ranges, or enhanced performance characteristics while maintaining core voltage specifications and package compatibility.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	V(BR) Min (V)	V(CL) Max (V)	Ipp (A)	P Peak (W)	Temp Range (°C)	Status	Package
CD214C-T28ALF	Bourns Inc.	28	31.1	45.4	33	1500	-55 to 150	Obsolete	DO-214AB (SMC)
SMCJ28A	Meritek	28	31.1	45.4	33.04	1500	-55 to 150	Active	DO-214AB (SMC)
3.0SMCJ28A-13	Diodes Incorporated	28	31.1	45.4	66.1	3000	-55 to 175	Active	DO-214AB (SMC)
5.0SMDJ28A	Taiwan Semiconductor Corporation	28	31.1	45.4	110	5000	-55 to 175	Active	DO-214AB (SMC)
5.0SMDJ28A-T7	Littelfuse Inc.	28	31.1	45.4	110	5000	-65 to 150	Active	DO-214AB (SMC)
LNBTVS4-304S	STMicroelectronics	28	30	45	334 (8/20µs)	22500	-55 to 150	Active	DO-214AB (SMC)
LNBTVS6-304S	STMicroelectronics	28	30	45	500 (8/20µs)	22500	-55 to 150	Active	DO-214AB (SMC)
SMCJ28A-13-F	Diodes Incorporated	28	31.1	45.4	33	1500	-55 to 150	Active	DO-214AB (SMC)
SMCJ28A-HR	Littelfuse	28	31.1	45.4	33.1	1500	-65 to 150	Active	DO-214AB (SMC)

Engineering Selection Recommendations

Primary Recommendation: SMCJ28A-13-F (Diodes Incorporated)

The SMCJ28A-13-F provides direct electrical equivalence to the CD214C-T28ALF with identical voltage ratings (28V standoff, 31.1V breakdown, 45.4V clamping), current rating (33A), and power dissipation (1500W). The part is in active production status with ROHS3 compliance and MSL 1 rating. High inventory availability (36,600 units) ensures supply continuity.

Secondary Recommendation: SMCJ28A (Meritek)

The SMCJ28A offers equivalent specifications with 33.04A peak pulse current and 1500W power rating. Active product status and substantial inventory (23,100 units) support procurement requirements. ROHS3 compliance is confirmed.

Higher-Performance Alternatives:

For applications requiring enhanced transient suppression capability, the following parts provide superior performance while maintaining core voltage compatibility:

3.0SMCJ28A-13 (Diodes Incorporated): Doubles peak pulse current to 66.1A and power to 3000W with extended temperature range to 175°C.
5.0SMDJ28A (Taiwan Semiconductor Corporation): Provides 110A peak pulse current and 5000W power dissipation with -55°C to 175°C operating range.
5.0SMDJ28A-T7 (Littelfuse Inc.): Delivers 110A peak pulse current and 5000W power with extended low-temperature rating to -65°C.

High-Current Alternatives (STMicroelectronics TRANSIL™ Series):

LNBTVS4-304S: 334A peak pulse (8/20µs) and 22.5kW power rating for extreme transient events.
LNBTVS6-304S: 500A peak pulse (8/20µs) and 22.5kW power rating for maximum protection.

All substitute parts maintain DO-214AB (SMC) package compatibility, ROHS3 compliance, and MSL 1 moisture sensitivity rating. Selection should be based on application transient severity and thermal management requirements.

Frequently Asked Questions (FAQ)

Q: Can SMCJ28A-13-F directly replace CD214C-T28ALF without circuit modification?

A: Yes. The SMCJ28A-13-F maintains identical voltage specifications (28V standoff, 31.1V breakdown, 45.4V clamping), current rating (33A), power dissipation (1500W), and DO-214AB (SMC) package. No circuit changes are required.

Q: What is the difference between direct equivalents and higher-performance alternatives?

A: Direct equivalents (SMCJ28A, SMCJ28A-13-F, SMCJ28A-HR) match the original 33A current and 1500W power specifications. Higher-performance alternatives (3.0SMCJ28A-13, 5.0SMDJ28A series) provide increased current handling (66A to 110A) and power dissipation (3000W to 5000W) for applications experiencing severe transient events.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are confirmed ROHS3 compliant and carry MSL 1 (unlimited) moisture sensitivity ratings, meeting regulatory requirements equivalent to the original CD214C-T28ALF.

Q: What is the significance of the 8/20µs pulse specification for STMicroelectronics TRANSIL™ parts?

A: The 8/20µs pulse waveform is a standard test condition for high-current transient events. LNBTVS4-304S and LNBTVS6-304S are rated for this waveform, indicating capability to suppress extreme transients. Standard 10/1000µs ratings apply to the other substitute parts.

Q: Can I use a higher-power rated part (5.0SMDJ28A) in place of the original 1500W part?

A: Yes. Higher power ratings provide additional margin for transient suppression without affecting circuit operation. The 5.0SMDJ28A maintains identical voltage specifications while offering 5000W dissipation capacity, suitable for applications with severe transient environments or thermal constraints.

Q: What is the temperature range consideration when selecting substitutes?

A: The original CD214C-T28ALF operates from -55°C to 150°C. Most substitutes maintain this range. Extended-range alternatives (3.0SMCJ28A-13, 5.0SMDJ28A) extend to 175°C. The 5.0SMDJ28A-T7 extends the low-temperature limit to -65°C. Select based on application operating environment.

Q: Are there inventory considerations for substitute selection?

A: Yes. SMCJ28A-13-F (36,600 units) and SMCJ28A (23,100 units) offer the highest availability. LNBTVS6-304S (9,097 units) and 5.0SMDJ28A (9,400 units) provide moderate availability. CD214C-T28ALF (1,086 units) and SMCJ28A-HR (773 units) have limited stock. Procurement strategy should prioritize high-availability alternatives for long-term supply security.

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