CD214L-T170ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T170ALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This unidirectional Zener diode operates with a 170V reverse standoff voltage and provides 275V clamping at peak pulse current, delivering 3kW peak pulse power dissipation in a DO-214AB (SMC) package.

The CD214L-T170ALF is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring 170V TVS protection.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	170	V
Voltage - Breakdown (Min)	189	V
Voltage - Clamping (Max) @ Ipp	275	V
Current - Peak Pulse (10/1000µs)	11	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the CD214L-T170ALF are classified into two categories based on electrical parameter compatibility:

Direct Equivalent (Identical Electrical Performance): Parts that maintain all critical electrical parameters: 170V reverse standoff voltage, 189V minimum breakdown voltage, 275V maximum clamping voltage, 11A peak pulse current, and 3kW peak pulse power. These parts are pin-compatible and functionally interchangeable in the same circuit application.

Similar Substitute (Enhanced Electrical Performance): Parts that exceed the minimum electrical requirements by providing higher peak pulse current (18.2A) and peak pulse power (5kW) while maintaining the same voltage specifications (170V standoff, 275V clamping). These parts offer improved transient protection capability and are suitable for applications requiring higher surge current handling.

All substitute parts share the following mandatory compatibility criteria:

Unidirectional Zener diode type
Single channel configuration
DO-214AB (SMC) surface-mount package
170V reverse standoff voltage (typical)
189V minimum breakdown voltage
275V maximum clamping voltage
Operating temperature range compatible with -55°C to 150°C minimum

Parameter Comparison

Part Number	Manufacturer	Product Status	Ipp (A)	Power (W)	Temp Range (°C)	Packaging
CD214L-T170ALF	Bourns Inc.	Obsolete	11	3000	-55 to 150	Bulk
SMLJ170A	Bourns Inc.	Active	11	3000	-55 to 150	Tape & Reel
SMDJ170A	Alpha & Omega Semiconductor Inc.	Active	11	3000	-55 to 150	Tape & Reel
5.0SMDJ170A	MDE Semiconductor Inc.	Active	18.2	5000	-55 to 150	Tape & Reel
5.0SMDJ170A-T7	Littelfuse	Active	18.2	5000	-65 to 150	Tape & Reel
SMCJ170A	Fairchild Semiconductor	Active	5.5	1500	-55 to 150	Bulk
SMCJ170A-TP	Micro Commercial Co.	Active	5.5	1500	-55 to 175	Tape & Reel

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

SMLJ170A (Bourns Inc.) and SMDJ170A (Alpha & Omega Semiconductor Inc.) are the primary direct equivalents, both maintaining 11A peak pulse current and 3kW power dissipation. Both parts are active products with ROHS3 compliance and REACH compliance status. SMLJ170A is available in higher inventory (30,272 pcs) and maintains the same manufacturer as the original part. SMDJ170A offers an alternative from a different manufacturer with comparable availability (10,100 pcs).

For Enhanced Protection (Higher Current Capability):

5.0SMDJ170A (MDE Semiconductor Inc.) and 5.0SMDJ170A-T7 (Littelfuse) provide 18.2A peak pulse current and 5kW power dissipation while maintaining identical voltage specifications. These parts are suitable for applications requiring higher transient surge protection. The Littelfuse variant extends the operating temperature range to -65°C, providing additional thermal margin.

For Cost-Optimized Applications (Lower Current Requirement):

SMCJ170A (Fairchild Semiconductor) and SMCJ170A-TP (Micro Commercial Co.) provide 5.5A peak pulse current and 1.5kW power dissipation. These parts are appropriate only for applications where the lower current rating is sufficient. SMCJ170A-TP offers extended temperature operation to 175°C.

All recommended substitutes are active products with current manufacturing status and appropriate compliance certifications for industrial applications.

Frequently Asked Questions (FAQ)

Q: Can SMCJ170A replace CD214L-T170ALF directly?

A: SMCJ170A shares the same voltage specifications (170V standoff, 275V clamping) and package (DO-214AB SMC), but provides only 5.5A peak pulse current versus the original 11A. This part is suitable only if the application circuit requires less than 5.5A transient current handling. Verify circuit transient requirements before substitution.

Q: What is the difference between SMLJ170A and SMDJ170A?

A: Both parts provide identical electrical performance (11A, 3kW, 170V/275V) and are direct equivalents to CD214L-T170ALF. The primary differences are manufacturer (Bourns vs. Alpha & Omega Semiconductor) and packaging availability. SMLJ170A is available in higher volume (30,272 pcs).

Q: When should I use 5.0SMDJ170A instead of SMLJ170A?

A: Use 5.0SMDJ170A when the application experiences transient surge currents exceeding 11A. This part provides 18.2A peak pulse current and 5kW power dissipation, offering enhanced protection margin. Verify that the circuit design can accommodate the higher clamping voltage performance without adverse effects.

Q: Are all substitute parts available in Tape & Reel packaging?

A: No. SMCJ170A is available only in bulk packaging. SMLJ170A, SMDJ170A, 5.0SMDJ170A, 5.0SMDJ170A-T7, and SMCJ170A-TP are available in Tape & Reel (TR) packaging suitable for automated assembly. Verify packaging requirements for your production process.

Q: Do all substitute parts meet RoHS3 compliance?

A: SMLJ170A, SMDJ170A, and SMCJ170A-TP are confirmed ROHS3 compliant. SMCJ170A and SMCJ170A (Fairchild) do not list RoHS status in provided specifications. Verify compliance requirements for your application before final selection.

Q: What is the temperature operating range difference between substitutes?

A: Most parts operate from -55°C to 150°C. SMCJ170A-TP extends to 175°C maximum junction temperature. 5.0SMDJ170A-T7 (Littelfuse) extends the minimum to -65°C, providing wider thermal operating margin in cold environments.

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