CD214L-T120ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T120ALF is a unidirectional transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 120V reverse standoff voltage with a 193V maximum clamping voltage and 15.6A peak pulse current capability in a DO-214AB (SMC) package. The part is currently listed 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)	15.6A
Power - Peak Pulse	3000W (3kW)
Package / Case	DO-214AB, SMC
Operating Temperature Range	-55°C ~ 150°C (TJ)
Type	Zener, Unidirectional
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the CD214L-T120ALF is determined by the following critical parameters:

Voltage - Reverse Standoff: 120V (exact match required)
Voltage - Clamping (Max) @ Ipp: 193V (exact match required)
Package / Case: DO-214AB, SMC (exact match required)
Current - Peak Pulse: 15.6A minimum (equal or higher acceptable)
Power - Peak Pulse: 3000W minimum (equal or higher acceptable)
Operating Temperature: -55°C minimum lower bound (equal or wider range acceptable)
RoHS Compliance: ROHS3 Compliant (required for regulatory alignment)

Substitute parts are grouped into two categories:

Direct Equivalents (Identical Electrical & Thermal Specifications): Parts matching all critical parameters including 15.6A peak pulse current and 3000W power dissipation.

Higher-Rated Alternatives (Enhanced Performance Capability): Parts with identical voltage specifications but higher current and power ratings (26A / 5000W), suitable for applications requiring additional margin or higher transient energy absorption.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	Clamping @ Ipp (V)	Ipp (A)	Power (W)	Temp Range (°C)	Package	Status	Inventory
CD214L-T120ALF	Bourns Inc.	120	193	15.6	3000	-55 to 150	DO-214AB	Obsolete	1154
SMLJ120A	Bourns Inc.	120	193	15.6	3000	-55 to 150	DO-214AB	Active	13669
SMDJ120A	Alpha & Omega Semiconductor Inc.	120	193	15.6	3000	-55 to 150	DO-214AB	Active	1205
SMDJ120A-HR	Littelfuse Inc.	120	193	15.5	3000	-65 to 150	DO-214AB	Active	679
SMDJ120A-HRA	Littelfuse Inc.	120	193	15.5	3000	-65 to 150	DO-214AB	Active	930
SMDJ120A-HRAT7	Littelfuse Inc.	120	193	15.5	3000	-65 to 150	DO-214AB	Active	753
SMDJ120A-T7	Littelfuse Inc.	120	193	15.5	3000	-65 to 150	DO-214AB	Active	869
5.0SMDJ120A	MDE Semiconductor Inc	120	193	26	5000	-55 to 150	DO-214AB	Active	1703
5.0SMDJ120A-T7	Littelfuse Inc.	120	193	26	5000	-65 to 150	DO-214AB	Active	1789
SMCJ120A	Fairchild Semiconductor	120	193	7.9	1500	-55 to 150	DO-214AB	Active	9400

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent: SMLJ120A (Bourns Inc.) is the preferred direct substitute for CD214L-T120ALF. Both parts are manufactured by Bourns Inc., share identical electrical specifications (120V standoff, 193V clamping, 15.6A peak pulse, 3000W power), and are packaged in DO-214AB. SMLJ120A is active in production with substantial inventory availability (13,669 units), ensuring long-term supply continuity. Both parts are ROHS3 compliant.

Secondary Recommendations - Equivalent Performance: SMDJ120A (Alpha & Omega Semiconductor Inc.) and Littelfuse SMDJ120A variants (SMDJ120A-HR, SMDJ120A-HRA, SMDJ120A-HRAT7, SMDJ120A-T7) provide equivalent electrical performance with identical voltage and power specifications. Littelfuse variants offer extended lower operating temperature range (-65°C vs. -55°C), beneficial for applications in extreme cold environments. All are active products with ROHS3 compliance.

Higher-Rated Alternative: 5.0SMDJ120A (MDE Semiconductor Inc.) and 5.0SMDJ120A-T7 (Littelfuse Inc.) provide enhanced current handling (26A vs. 15.6A) and power dissipation (5000W vs. 3000W) while maintaining identical voltage specifications. These parts are suitable for applications requiring additional transient energy absorption margin or higher fault current tolerance. Both are active products with ROHS3 compliance.

Not Recommended: SMCJ120A (Fairchild Semiconductor) has reduced peak pulse current (7.9A) and power rating (1500W), making it unsuitable as a direct substitute for the CD214L-T120ALF in applications requiring the full 15.6A / 3000W specification.

Frequently Asked Questions (FAQ)

Q: Can SMLJ120A directly replace CD214L-T120ALF without circuit modification? A: Yes. SMLJ120A is a direct electrical and mechanical equivalent with identical voltage specifications (120V standoff, 193V clamping), current rating (15.6A), power dissipation (3000W), and DO-214AB package. No circuit changes are required.

Q: What is the difference between SMDJ120A variants from Littelfuse (HR, HRA, HRAT7, T7)? A: All Littelfuse SMDJ120A variants maintain identical electrical specifications (120V, 193V, 15.5A, 3000W) and DO-214AB packaging. Variants differ in series designation and tape/reel configuration. The HR and HRA designations indicate high-reliability screening. The T7 suffix indicates tape packaging. Selection depends on procurement and assembly requirements.

Q: When should 5.0SMDJ120A be used instead of direct equivalents? A: 5.0SMDJ120A is selected when the application requires higher transient energy absorption capability (5000W vs. 3000W) or higher peak pulse current handling (26A vs. 15.6A). Voltage specifications remain identical, so circuit operation is unchanged. This part provides additional safety margin in high-energy transient environments.

Q: Are all substitute parts ROHS3 compliant? A: All recommended substitute parts are ROHS3 compliant. SMCJ120A from Fairchild Semiconductor does not list explicit ROHS3 status in the provided data and is not recommended for this reason.

Q: Does operating temperature range affect substitution eligibility? A: Operating temperature range does not disqualify substitution if the specified range meets or exceeds the original part's minimum requirement. CD214L-T120ALF operates -55°C to 150°C. Littelfuse variants extend the lower bound to -65°C, providing wider environmental coverage without affecting circuit performance.

Q: What packaging options are available for substitute parts? A: All substitute parts use DO-214AB (SMC) surface-mount packaging, matching the original CD214L-T120ALF. Packaging variants (Tape & Reel vs. Bulk) affect procurement and assembly handling but do not affect electrical performance or circuit compatibility.

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