CD214L-T110ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T110ALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., classified as a unidirectional Zener-type device in the DO-214AB (SMC) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a reverse standoff voltage of 110V and peak pulse power rating of 3000W. 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)	110V
Voltage - Breakdown (Min)	122V
Voltage - Clamping (Max) @ Ipp	177V
Current - Peak Pulse (10/1000µs)	16.8A
Power - Peak Pulse	3000W
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-T110ALF is determined by the following critical parameters:

Voltage - Reverse Standoff: 110V (exact match required)
Voltage - Breakdown (Min): 122V (exact match required)
Voltage - Clamping (Max) @ Ipp: 177V (exact match required)
Package / Case: DO-214AB, SMC (exact match required)
Current - Peak Pulse (10/1000µs): 16.8A nominal (tolerance range 16.8A to 17A acceptable)
Power - Peak Pulse: 3000W nominal (tolerance range 3000W to 3000W acceptable)
Operating Temperature: -55°C minimum (extended ranges acceptable)
Type: Zener, Unidirectional (exact match required)

Substitute parts are grouped into two categories:

Direct Equivalents: Parts meeting all critical parameters with identical or compatible electrical specifications and peak pulse ratings of 3000W.

Similar Alternatives: Parts meeting voltage and package requirements but with higher peak pulse current and power ratings (5000W category), suitable for applications requiring enhanced transient suppression capability.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ)	VBR (Min)	VC (Max)	Ipp (A)	Power (W)	Temp Range	Status
CD214L-T110ALF	Bourns Inc.	110V	122V	177V	16.8	3000	-55 to 150°C	Obsolete
SMLJ110A	Bourns Inc.	110V	122V	177V	16.8	3000	-55 to 150°C	Active
SMDJ110A	Alpha & Omega Semiconductor Inc.	110V	122V	177V	17	3000	-55 to 150°C	Active
SMDJ110A-HR	Littelfuse Inc.	110V	122V	177V	16.9	3000	-65 to 150°C	Active
SMDJ110A-HRA	Littelfuse Inc.	110V	122V	177V	16.9	3000	-65 to 150°C	Active
SMDJ110A-HRAT7	Littelfuse Inc.	110V	122V	177V	16.9	3000	-65 to 150°C	Active
5.0SMDJ110A	MDE Semiconductor Inc	110V	122V	177V	28.3	5000	-55 to 150°C	Active
5.0SMDJ110A-T7	Littelfuse Inc.	110V	122V	177V	28.3	5000	-65 to 150°C	Active
SMCJ110A	Fairchild Semiconductor	110V	122V	177V	8.4	1500	-55 to 150°C	Active
SMCJ110A-TP	Micro Commercial Co	110V	122V	177V	8.5	1500	-55 to 175°C	Active

Engineering Selection Recommendations

Preferred Direct Equivalents (3000W Category):

SMLJ110A (Bourns Inc.) is the primary recommended substitute. Manufactured by the same supplier as the original part, it maintains identical electrical specifications and is in active production status with ROHS3 compliance and unlimited moisture sensitivity rating.

SMDJ110A (Alpha & Omega Semiconductor Inc.) and SMDJ110A-HR/HRA/HRAT7 (Littelfuse Inc.) are functionally equivalent alternatives. The Littelfuse variants offer extended lower operating temperature limits (-65°C vs -55°C), providing additional thermal margin for demanding applications. All variants maintain the 3000W peak pulse power rating and are ROHS3 compliant.

Enhanced Performance Alternatives (5000W Category):

5.0SMDJ110A (MDE Semiconductor Inc.) and 5.0SMDJ110A-T7 (Littelfuse Inc.) provide doubled peak pulse power capability (5000W vs 3000W) with proportionally higher peak pulse current (28.3A vs 16.8A). These parts are suitable for applications requiring enhanced transient suppression margin. The Littelfuse variant includes extended lower temperature rating (-65°C).

Lower Power Alternatives (1500W Category):

SMCJ110A (Fairchild Semiconductor) and SMCJ110A-TP (Micro Commercial Co) operate at half the power rating (1500W) with correspondingly reduced peak pulse current (8.4-8.5A). These are suitable only for applications with reduced transient energy requirements. SMCJ110A-TP offers extended upper temperature rating (175°C).

All substitute parts maintain the DO-214AB (SMC) package footprint, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can SMLJ110A directly replace CD214L-T110ALF without circuit modifications?

A: Yes. SMLJ110A is a direct electrical and mechanical equivalent with identical voltage ratings (110V standoff, 122V breakdown, 177V clamping), peak pulse specifications (16.8A, 3000W), and DO-214AB package. No circuit changes are required.

Q: What is the difference between the 3000W and 5000W substitute options?

A: The 5000W variants (5.0SMDJ110A, 5.0SMDJ110A-T7) provide doubled transient energy absorption capability with higher peak pulse current (28.3A vs 16.8A). Voltage ratings remain identical. Selection depends on application transient severity. Higher power ratings provide additional design margin but may increase component cost.

Q: Are the Littelfuse SMDJ110A-HR, SMDJ110A-HRA, and SMDJ110A-HRAT7 variants interchangeable?

A: Yes, these three Littelfuse variants are electrically and mechanically interchangeable. All share identical voltage and power specifications (110V standoff, 177V clamping, 3000W power, 16.9A peak pulse). The suffix designations indicate packaging or tape reel configurations. Selection is based on procurement and assembly requirements.

Q: Why do some substitutes have lower operating temperature minimums (-65°C vs -55°C)?

A: Extended lower temperature ratings indicate enhanced thermal performance and design margin. Parts rated to -65°C are suitable for applications in colder environments or with tighter thermal constraints. The original CD214L-T110ALF specification of -55°C to 150°C is met by all recommended substitutes.

Q: Can SMCJ110A (1500W) be used as a cost-reduction alternative?

A: SMCJ110A maintains identical voltage specifications and DO-214AB package compatibility. However, its 1500W power rating is half that of the original part. Use only if application transient energy analysis confirms that peak pulse current will not exceed 8.4A and total energy dissipation remains below 1500W. Undersizing transient suppressors risks inadequate protection.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitutes are ROHS3 compliant. Compliance certifications are maintained across all active-status alternatives, ensuring regulatory compatibility with modern manufacturing and environmental standards.

Q: What packaging options are available for the substitute parts?

A: All substitutes are supplied in DO-214AB (SMC) surface mount package, maintaining identical PCB footprint and assembly compatibility. Packaging variants (Tape & Reel, bulk) are available from individual manufacturers but do not affect electrical or mechanical specifications.

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