CD214C-T170ALF Equivalent & Substitute Parts

Part Overview

The CD214C-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 275V maximum clamping voltage, delivering 5.5A peak pulse current in a compact DO-214AB (SMC) package. The part is currently obsolete, making equivalent and substitute parts essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214C-T170ALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	170V
Voltage - Breakdown (Min)	189V
Voltage - Clamping (Max) @ Ipp	275V
Current - Peak Pulse (10/1000µs)	5.5A
Power - Peak Pulse	1500W
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the CD214C-T170ALF is determined by strict electrical and mechanical compatibility across the following critical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 170V
Voltage - Clamping (Max) @ Ipp: 275V
Voltage - Breakdown (Min): 189V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener, Unidirectional

Substitute Categories:

Direct Equivalents maintain identical electrical specifications and peak pulse current (5.5A, 1500W):

SMCJ170A (Fairchild Semiconductor) — Active status, bulk packaging
SMCJ170A-HR (Littelfuse Inc.) — Active status, tape & reel packaging, extended temperature range to -65°C
SMCJ170A-TP (Micro Commercial Co) — Active status, tape & reel packaging, extended temperature range to 175°C

Similar Substitutes share core voltage parameters but differ in peak pulse current and power dissipation:

SMDJ170A (Alpha & Omega Semiconductor Inc.) — 11A peak pulse, 3000W power
SMDJ170A-T7 (Littelfuse Inc.) — 10.9A peak pulse, 3000W power
SMLJ170A-TP (Micro Commercial Co) — 11A peak pulse, 3000W power
5.0SMDJ170A (MDE Semiconductor Inc) — 18.2A peak pulse, 5000W power
5.0SMDJ170A-T7 (Littelfuse) — 18.2A peak pulse, 5000W power

Parameter Comparison

Part Number	Manufacturer	Status	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max (V)	Peak Pulse (A)	Power (W)	Temp Range (°C)	Package
CD214C-T170ALF	Bourns Inc.	Obsolete	170	189	275	5.5	1500	-55 ~ 150	DO-214AB
SMCJ170A	Fairchild Semiconductor	Active	170	189	275	5.5	1500	-55 ~ 150	DO-214AB
SMCJ170A-HR	Littelfuse Inc.	Active	170	189	275	5.5	1500	-65 ~ 150	DO-214AB
SMCJ170A-TP	Micro Commercial Co	Active	170	189	275	5.5	1500	-55 ~ 175	DO-214AB
SMDJ170A	Alpha & Omega Semiconductor Inc.	Active	170	189	275	11	3000	-55 ~ 150	DO-214AB
SMDJ170A-T7	Littelfuse Inc.	Active	170	189	275	10.9	3000	-65 ~ 150	DO-214AB
SMLJ170A-TP	Micro Commercial Co	Active	170	189	275	11	3000	-55 ~ 175	DO-214AB
5.0SMDJ170A	MDE Semiconductor Inc	Active	170	189	275	18.2	5000	-55 ~ 150	DO-214AB
5.0SMDJ170A-T7	Littelfuse	Active	170	189	275	18.2	5000	-65 ~ 150	DO-214AB

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

Select SMCJ170A, SMCJ170A-HR, or SMCJ170A-TP when the application requires exact electrical equivalence to the CD214C-T170ALF. All three maintain 5.5A peak pulse current and 1500W power dissipation. SMCJ170A-HR and SMCJ170A-TP offer extended operating temperature ranges (-65°C and 175°C respectively), providing design margin for temperature-sensitive applications. All substitute options are active products with ROHS3 compliance.

For Enhanced Performance (Higher Current Capacity):

Applications requiring greater transient energy absorption benefit from SMDJ170A, SMDJ170A-T7, or SMLJ170A-TP, which deliver 11A peak pulse current and 3000W power dissipation. These parts maintain identical voltage parameters while doubling power handling capability. SMDJ170A-T7 extends the lower temperature limit to -65°C.

For Maximum Transient Protection:

The 5.0SMDJ170A and 5.0SMDJ170A-T7 series provide the highest transient energy absorption at 18.2A peak pulse and 5000W power. These are suitable for applications with severe transient environments or where design margin is critical. 5.0SMDJ170A-T7 includes extended low-temperature operation to -65°C.

Compliance Considerations:

All active substitute parts carry ROHS3 compliance. Littelfuse products (SMCJ170A-HR, SMDJ170A-T7, 5.0SMDJ170A-T7) and MDE Semiconductor (5.0SMDJ170A) are REACH Unaffected. Fairchild SMCJ170A and Alpha & Omega SMDJ170A are REACH Unaffected. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Frequently Asked Questions (FAQ)

Q: Can SMCJ170A directly replace CD214C-T170ALF without circuit modification?

A: Yes. SMCJ170A maintains identical voltage specifications (170V standoff, 189V breakdown, 275V clamping) and peak pulse current (5.5A). Both use DO-214AB packaging. No circuit changes are required for direct substitution.

Q: What is the difference between SMCJ170A and SMDJ170A?

A: Both maintain identical voltage parameters and DO-214AB packaging. SMDJ170A delivers 11A peak pulse current and 3000W power dissipation, compared to SMCJ170A's 5.5A and 1500W. SMDJ170A provides enhanced transient protection for higher-energy surge environments.

Q: Why do some substitutes have different peak pulse currents?

A: Peak pulse current and power dissipation are design parameters that vary by manufacturer and product series while maintaining the same voltage protection levels. Higher current ratings provide greater transient energy absorption without changing the voltage clamping characteristics.

Q: Are extended temperature range variants (SMCJ170A-HR, SMDJ170A-T7) compatible with standard -55°C to 150°C applications?

A: Yes. Extended temperature range parts are backward compatible with standard temperature applications. They provide additional design margin for temperature-sensitive environments without performance degradation in standard operating ranges.

Q: What packaging options are available for these substitutes?

A: All substitutes use DO-214AB (SMC) surface mount packaging, identical to the original CD214C-T170ALF. Packaging variations include bulk and tape & reel (TR) options, which affect supply chain logistics but not electrical or mechanical compatibility.

Q: Is REACH compliance important for my application?

A: REACH compliance status depends on your end-market requirements. Most substitutes are REACH Unaffected. Verify your specific regulatory requirements with your procurement or compliance team.

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