CD214L-T17ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T17ALF is a 17V Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., rated for 27.6V clamping voltage and 106.6A peak pulse current in a surface mount SMC (DO-214AB) 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 overvoltage protection in general-purpose applications. The obsolete status of the CD214L-T17ALF requires identification of active alternative components that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	17V	V
Voltage - Breakdown (Min)	18.9V	V
Voltage - Clamping (Max) @ Ipp	27.6V	V
Current - Peak Pulse (10/1000µs)	106.6A	A
Power - Peak Pulse	3000W	W
Operating Temperature Range	-55°C to 150°C	°C (TJ)
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the CD214L-T17ALF is determined by the following critical parameters:

Mandatory 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

Allowable Variation Parameters:

Current - Peak Pulse (10/1000µs): 106.6A nominal; substitutes with ≥106.6A are acceptable
Power - Peak Pulse: 3000W nominal; substitutes with ≥3000W are acceptable
Operating Temperature Range: -55°C to 150°C nominal; extended ranges are acceptable
Product Status: Active substitutes preferred over obsolete

Substitute parts are grouped into two categories:

Direct Equivalents (Identical Electrical Specifications): Parts matching all mandatory parameters and maintaining the 3000W power rating with 106.6A peak pulse current.

Higher-Rated Equivalents (Enhanced Specifications): Parts matching all mandatory parameters but offering increased power dissipation (5000W) and peak pulse current (181A), providing superior transient protection margin.

Parameter Comparison

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)	Product Status	Package
CD214L-T17ALF	Bourns Inc.	17	18.9	27.6	106.6	3000	-55 to 150	Obsolete	DO-214AB, SMC
SMLJ17A	Bourns Inc.	17	18.9	27.6	106.6	3000	-55 to 150	Active	DO-214AB, SMC
5.0SMDJ17A	Taiwan Semiconductor Corporation	17	18.9	27.6	181	5000	-55 to 175	Active	DO-214AB, SMC
5.0SMDJ17A-T7	Littelfuse Inc.	17	18.9	27.6	181	5000	-65 to 150	Active	DO-214AB, SMC
SMCJ17A	Fairchild Semiconductor	17	18.9	27.6	54.4	1500	-55 to 150	Active	DO-214AB, SMC
SMCJ17A-TP	Micro Commercial Co	17	18.9	27.6	54.4	1500	-55 to 175	Active	DO-214AB, SMC
SMDJ17A	Alpha & Omega Semiconductor Inc.	17	18.9	27.6	108.7	3000	-55 to 150	Active	DO-214AB, SMC
SMLJ17A-TP	Micro Commercial Co	17	18.9	27.6	106.6	3000	-55 to 175	Active	DO-214AB, SMC
TPSMC20A	Littelfuse Inc.	17.1	19	27.7	54.9	1500	-55 to 150	Active	DO-214AB, SMC
TPSMC22A	Littelfuse Inc.	18.8	20.9	30.6	49.7	1500	-55 to 150	Active	DO-214AB, SMC

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

SMLJ17A (Bourns Inc.) and SMLJ17A-TP (Micro Commercial Co) are the preferred direct equivalents. Both maintain identical voltage specifications (17V standoff, 18.9V breakdown, 27.6V clamping), matching peak pulse current (106.6A), and power rating (3000W). SMLJ17A-TP offers extended operating temperature range (-55°C to 175°C) compared to the original specification. Both are active products with ROHS3 compliance.

Secondary Substitutes (Higher-Rated Protection):

5.0SMDJ17A (Taiwan Semiconductor Corporation) and 5.0SMDJ17A-T7 (Littelfuse Inc.) provide enhanced transient protection with doubled power dissipation (5000W) and increased peak pulse current (181A) while maintaining identical voltage parameters. These are suitable for applications requiring additional safety margin. Both are active products with ROHS3 compliance.

Alternative Substitutes (Lower-Rated Protection):

SMCJ17A (Fairchild Semiconductor) and SMCJ17A-TP (Micro Commercial Co) maintain voltage specifications but provide reduced power rating (1500W) and peak pulse current (54.4A). These are suitable only for applications with lower transient energy requirements. SMCJ17A-TP offers extended temperature range (-55°C to 175°C).

SMDJ17A (Alpha & Omega Semiconductor Inc.) provides near-equivalent specifications with 108.7A peak pulse current and 3000W power rating, maintaining all voltage parameters.

Marginal Substitutes (Voltage Deviation):

TPSMC20A and TPSMC22A (Littelfuse Inc.) exhibit voltage parameter deviations. TPSMC20A shows 17.1V standoff and 19V breakdown (within 1% tolerance). TPSMC22A shows 18.8V standoff and 20.9V breakdown (outside acceptable tolerance). Both offer reduced power ratings (1500W). TPSMC20A and TPSMC22A carry AEC-Q101 automotive qualification. Use only when voltage tolerance is explicitly acceptable in application requirements.

Frequently Asked Questions (FAQ)

Q: Can SMCJ17A replace CD214L-T17ALF directly?

A: SMCJ17A maintains all voltage specifications and package compatibility but provides only 1500W power dissipation and 54.4A peak pulse current compared to the original 3000W and 106.6A. Direct replacement is acceptable only if the application transient energy is confirmed to be within 1500W limits. For applications requiring the full 3000W protection, SMLJ17A or SMDJ17A are required.

Q: What is the difference between SMLJ17A and 5.0SMDJ17A?

A: Both maintain identical voltage specifications (17V standoff, 18.9V breakdown, 27.6V clamping) and package format (DO-214AB, SMC). The 5.0SMDJ17A provides enhanced protection with 5000W power dissipation and 181A peak pulse current versus SMLJ17A's 3000W and 106.6A. Selection depends on transient energy requirements in the application circuit.

Q: Are TPSMC20A and TPSMC22A suitable substitutes?

A: TPSMC20A exhibits minimal voltage deviation (17.1V standoff, 19V breakdown) and may be acceptable if application design tolerates ±1% voltage variation. TPSMC22A shows significant voltage deviation (18.8V standoff, 20.9V breakdown) and is not recommended as a direct substitute. Both offer reduced power ratings (1500W) and are automotive-qualified (AEC-Q101).

Q: Does packaging format affect substitution?

A: All listed substitutes use DO-214AB (SMC) surface mount package, maintaining mechanical and thermal compatibility. Packaging variants (Tape & Reel vs. Bulk) do not affect electrical performance but may impact procurement and assembly processes.

Q: What is the significance of product status (Active vs. Obsolete)?

A: The CD214L-T17ALF is obsolete, meaning Bourns Inc. no longer manufactures or supports this component. Active substitutes ensure long-term availability, continued manufacturer support, and compliance with current quality standards. All recommended substitutes are active products.

Q: Are all substitutes ROHS3 compliant?

A: All primary and secondary substitutes (SMLJ17A, SMLJ17A-TP, 5.0SMDJ17A, 5.0SMDJ17A-T7, SMDJ17A) are ROHS3 compliant. TPSMC20A and TPSMC22A are also ROHS3 compliant. Compliance verification is recommended during procurement.

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