CD214C-T120ALF Equivalent & Substitute Parts

Part Overview

The CD214C-T120ALF 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 features a 120V reverse standoff voltage with 193V maximum clamping voltage and 7.9A peak pulse current capability in a DO-214AB (SMC) package. The 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)	120V
Voltage - Breakdown (Min)	133V
Voltage - Clamping (Max) @ Ipp	193V
Current - Peak Pulse (10/1000µs)	7.9A
Power - Peak Pulse	1500W
Package / Case	DO-214AB, SMC
Operating Temperature Range	-55°C ~ 150°C (TJ)
Type	Zener, Unidirectional
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the CD214C-T120ALF is determined by strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 120V (exact match required)
Voltage - Clamping (Max) @ Ipp: 193V (exact match required)
Package / Case: DO-214AB, SMC (exact match required)
Mounting Type: Surface Mount (exact match required)
Type: Zener, Unidirectional (exact match required)

Substitute Categories:

Direct Equivalents maintain all electrical parameters within the original specification:

SMCJ120A (Fairchild Semiconductor): Identical electrical performance, active product status

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

SMCJ120A-HR, SMCJ120A-HRA, SMCJ120A-HRAT7 (Littelfuse Inc.): 7.8A peak pulse current, 1500W power rating, extended temperature range to -65°C
SMDJ120A (Alpha & Omega Semiconductor Inc.): 15.6A peak pulse current, 3000W power rating
SMDJ120A-HR (Littelfuse Inc.): 15.5A peak pulse current, 3000W power rating, extended temperature range to -65°C

Higher-Performance Substitutes exceed original specifications:

5.0SMDJ120A (MDE Semiconductor Inc.): 26A peak pulse current, 5000W power rating
5.0SMDJ120A-T7 (Littelfuse Inc.): 26A peak pulse current, 5000W power rating, extended temperature range to -65°C

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package	Operating Temperature	Product Status
CD214C-T120ALF	Bourns Inc.	120V	193V	7.9A	1500W	DO-214AB, SMC	-55°C ~ 150°C	Obsolete
SMCJ120A	Fairchild Semiconductor	120V	193V	7.9A	1500W	DO-214AB, SMC	-55°C ~ 150°C	Active
SMCJ120A-HR	Littelfuse Inc.	120V	193V	7.8A	1500W	DO-214AB, SMC	-65°C ~ 150°C	Active
SMCJ120A-HRA	Littelfuse Inc.	120V	193V	7.8A	1500W	DO-214AB, SMC	-65°C ~ 150°C	Active
SMCJ120A-HRAT7	Littelfuse Inc.	120V	193V	7.8A	1500W	DO-214AB, SMC	-65°C ~ 150°C	Active
SMDJ120A	Alpha & Omega Semiconductor Inc.	120V	193V	15.6A	3000W	DO-214AB, SMC	-55°C ~ 150°C	Active
SMDJ120A-HR	Littelfuse Inc.	120V	193V	15.5A	3000W	DO-214AB, SMC	-65°C ~ 150°C	Active
5.0SMDJ120A	MDE Semiconductor Inc.	120V	193V	26A	5000W	DO-214AB, SMC	-55°C ~ 150°C	Active
5.0SMDJ120A-T7	Littelfuse Inc.	120V	193V	26A	5000W	DO-214AB, SMC	-65°C ~ 150°C	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): SMCJ120A from Fairchild Semiconductor is the primary direct equivalent. This part maintains all electrical specifications of the CD214C-T120ALF while offering active product status and established supply availability.

For Extended Temperature Range Applications: SMCJ120A-HR, SMCJ120A-HRA, or SMCJ120A-HRAT7 from Littelfuse Inc. extend the lower operating temperature limit to -65°C while maintaining the original 7.8A peak pulse current specification. These variants are suitable for applications requiring enhanced cold-temperature performance.

For Higher Transient Energy Absorption: SMDJ120A (Alpha & Omega Semiconductor Inc.) or SMDJ120A-HR (Littelfuse Inc.) provide doubled peak pulse current (15.5-15.6A) and power dissipation (3000W), accommodating applications with more severe transient conditions while maintaining the 120V/193V voltage specification.

For Maximum Transient Protection: 5.0SMDJ120A (MDE Semiconductor Inc.) or 5.0SMDJ120A-T7 (Littelfuse Inc.) deliver the highest performance tier with 26A peak pulse current and 5000W power rating. The Littelfuse variant includes extended temperature range to -65°C.

All substitute parts are RoHS3 compliant and carry ECCN EAR99 classification, matching the regulatory status of the original component.

Frequently Asked Questions (FAQ)

Q: Can SMCJ120A directly replace CD214C-T120ALF in existing designs? A: Yes. SMCJ120A maintains identical electrical parameters (120V standoff, 193V clamping, 7.9A peak pulse) and package configuration (DO-214AB, SMC). The primary difference is product status: CD214C-T120ALF is obsolete while SMCJ120A is active.

Q: What is the difference between SMCJ120A-HR, SMCJ120A-HRA, and SMCJ120A-HRAT7? A: All three variants from Littelfuse Inc. share identical electrical specifications (7.8A peak pulse, 1500W power, 120V/193V voltage ratings) and extended temperature range (-65°C to 150°C). The suffix designations indicate packaging and tape configuration variants. Selection depends on procurement and assembly requirements.

Q: Can I use SMDJ120A or 5.0SMDJ120A if the original design only requires 7.9A peak pulse? A: Yes. These higher-performance variants (15.6A and 26A respectively) are electrically compatible substitutes. They maintain the required 120V standoff and 193V clamping voltages while providing additional transient energy absorption margin. No circuit redesign is required.

Q: Are all substitute parts available in the same package? A: Yes. All listed substitutes use the DO-214AB (SMC) surface mount package, ensuring mechanical and thermal compatibility with the original CD214C-T120ALF footprint.

Q: What is the temperature range difference between the original part and Littelfuse variants? A: CD214C-T120ALF operates from -55°C to 150°C. Littelfuse HR-series variants (SMCJ120A-HR, SMCJ120A-HRA, SMCJ120A-HRAT7, SMDJ120A-HR, 5.0SMDJ120A-T7) extend the lower limit to -65°C, providing 10°C additional cold-temperature margin.

Q: Do all substitutes meet RoHS and REACH compliance? A: All listed substitutes are RoHS3 compliant. REACH status varies: Fairchild SMCJ120A is REACH Affected; all Littelfuse, MDE, and Alpha & Omega variants are REACH Unaffected.

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