CD214C-T17ALF Equivalent & Substitute Parts

Part Overview

The CD214C-T17ALF is a 17V Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., rated for 27.6V clamping voltage and 53.3A peak pulse current in a surface mount SMC (DO-214AB) package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	17V
Voltage - Breakdown (Min)	18.9V
Voltage - Clamping (Max) @ Ipp	27.6V
Current - Peak Pulse (10/1000µs)	53.3A
Power - Peak Pulse	1500W
Package / Case	DO-214AB, SMC
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitution for the CD214C-T17ALF is determined by strict electrical and mechanical compatibility across the following parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 17V
Voltage - Breakdown (Min): 18.9V
Voltage - Clamping (Max) @ Ipp: 27.6V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Unidirectional Channels: 1

Acceptable Variation Parameters:

Current - Peak Pulse (10/1000µs): 53.3A minimum (higher values acceptable)
Power - Peak Pulse: 1500W minimum (higher values acceptable)
Operating Temperature: -55°C minimum, 150°C maximum (wider ranges acceptable)

Substitute parts are grouped into three categories:

Direct Equivalents: Parts with identical electrical ratings (53.3A peak pulse, 1500W power) and active product status.

Upgraded Equivalents: Parts with identical voltage and clamping specifications but higher current handling (181A) and power dissipation (5000W), suitable for applications requiring enhanced transient protection margin.

Functional Equivalents: Parts with matching voltage specifications and SMC package but different current ratings or temperature ranges, maintaining core protection characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage Standoff (V)	Breakdown Min (V)	Clamping Max (V)	Peak Pulse (A)	Power (W)	Package	Temp Range (°C)	Status
CD214C-T17ALF	Bourns Inc.	17	18.9	27.6	53.3	1500	DO-214AB, SMC	-55 ~ 150	Obsolete
SMCJ17A	Fairchild Semiconductor	17	18.9	27.6	54.4	1500	DO-214AB, SMC	-55 ~ 150	Active
SZ1SMC17AT3G	Littelfuse Inc.	17	18.9	27.6	53.3	1500	DO-214AB, SMC	-65 ~ 150	Active
SMCJ17A-HR	Littelfuse Inc.	17	18.9	27.6	54.4	1500	DO-214AB, SMC	-65 ~ 150	Active
SMCJ17A-HRA	Littelfuse Inc.	17	18.9	27.6	54.4	1500	DO-214AB, SMC	-65 ~ 150	Active
SMCJ17A-HRAT7	Littelfuse Inc.	17	18.9	27.6	54.4	1500	DO-214AB, SMC	-65 ~ 150	Active
SMCJ17A-TP	Micro Commercial Co	17	18.9	27.6	54.4	1500	DO-214AB, SMC	-55 ~ 175	Active
5.0SMDJ17A	Taiwan Semiconductor Corporation	17	18.9	27.6	181	5000	DO-214AB, SMC	-55 ~ 175	Active
5.0SMDJ17A-T7	Littelfuse Inc.	17	18.9	27.6	181	5000	DO-214AB, SMC	-65 ~ 150	Active

Engineering Selection Recommendations

For Direct Replacement (1:1 Substitution):

SMCJ17A (Fairchild Semiconductor) is the primary direct equivalent. It maintains identical voltage specifications, clamping characteristics, and power rating with active product status. Peak pulse current is marginally higher at 54.4A versus 53.3A, which is within acceptable tolerance for the same power class.

For Extended Temperature Range:

SZ1SMC17AT3G (Littelfuse Inc.) provides identical electrical performance with extended lower temperature rating (-65°C versus -55°C). This part carries AEC-Q101 automotive qualification and ROHS3 compliance, suitable for applications requiring automotive-grade reliability.

For High-Reliability Applications:

SMCJ17A-HR, SMCJ17A-HRA, and SMCJ17A-HRAT7 (all Littelfuse Inc.) are high-reliability variants with extended temperature range (-65°C to 150°C) and ROHS3 compliance. These parts are functionally equivalent to SMCJ17A with enhanced environmental specifications.

For Enhanced Transient Protection:

5.0SMDJ17A (Taiwan Semiconductor Corporation) and 5.0SMDJ17A-T7 (Littelfuse Inc.) provide upgraded performance with 181A peak pulse current and 5000W power dissipation. These parts maintain identical voltage and clamping specifications but offer significantly higher transient energy absorption. Selection is appropriate when circuit protection margins require enhancement or when handling higher transient stress conditions.

For Extended Operating Temperature:

SMCJ17A-TP (Micro Commercial Co) extends the upper temperature limit to 175°C while maintaining standard electrical ratings, suitable for high-temperature environment applications.

Frequently Asked Questions (FAQ)

Q: Can SMCJ17A directly replace CD214C-T17ALF?

A: Yes. SMCJ17A is electrically equivalent with matching 17V standoff voltage, 27.6V clamping voltage, and 1500W power rating. The 54.4A peak pulse current is marginally higher than the original 53.3A, which is acceptable within the same power class. Both use DO-214AB SMC packaging.

Q: What is the difference between standard SMCJ17A and SMCJ17A-HR variants?

A: SMCJ17A-HR, SMCJ17A-HRA, and SMCJ17A-HRAT7 are high-reliability versions with extended lower temperature rating (-65°C versus -55°C). Electrical performance is identical. Selection depends on environmental temperature requirements.

Q: When should 5.0SMDJ17A be used instead of SMCJ17A?

A: The 5.0SMDJ17A series is selected when enhanced transient protection is required. It maintains identical voltage specifications but provides 181A peak pulse current and 5000W power dissipation versus 54.4A and 1500W for SMCJ17A. Use this upgrade when circuit analysis indicates higher transient stress or when design margins require additional protection capacity.

Q: Are all substitute parts in DO-214AB SMC package?

A: Yes. All listed substitute parts use DO-214AB SMC surface mount packaging, ensuring mechanical and footprint compatibility with the original CD214C-T17ALF design.

Q: What compliance certifications apply to these substitutes?

A: All substitute parts listed are ROHS3 compliant. SZ1SMC17AT3G carries additional AEC-Q101 automotive qualification. Specific compliance requirements should be verified against application standards.

Q: Is the CD214C-T17ALF still available?

A: CD214C-T17ALF is classified as obsolete. Active substitute parts with equivalent specifications are available from multiple manufacturers, with SMCJ17A offering the most direct replacement option.

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