CD214L-T45ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T45ALF is a 45V unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., housed in a DO-214AB (SMC) surface mount package. This component is rated for 72.7V clamping voltage with 41.2A peak pulse current and 3000W peak pulse power dissipation. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214L-T45ALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	45V
Voltage - Breakdown (Min)	50V
Voltage - Clamping (Max) @ Ipp	72.7V
Current - Peak Pulse (10/1000µs)	41.2A
Power - Peak Pulse	3000W
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-214AB, SMC
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 45V
Voltage - Breakdown (Min): 50V
Voltage - Clamping (Max) @ Ipp: 72.7V
Unidirectional Channels: 1
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener

Acceptable Variation Parameters:

Current - Peak Pulse (10/1000µs): 41.2A nominal; higher ratings acceptable
Power - Peak Pulse: 3000W nominal; higher ratings acceptable
Operating Temperature: -55°C ~ 150°C nominal; extended ranges acceptable
Product Status: Active preferred; obsolete acceptable for legacy applications
RoHS and REACH Compliance: ROHS3 Compliant required

Substitute parts are grouped into two categories: Direct Equivalents (matching all electrical specifications within tolerance) and Similar Parts (matching voltage and package specifications with higher current/power ratings or extended temperature ranges).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Product Status	RoHS Status
CD214L-T45ALF	Bourns Inc.	45V	72.7V	41.2A	3000W	-55°C ~ 150°C	Obsolete	ROHS3 Compliant
SMLJ45A	Bourns Inc.	45V	72.7V	41.2A	3000W	-55°C ~ 150°C	Active	ROHS3 Compliant
5.0SMDJ45A	Taiwan Semiconductor Corporation	45V	72.7V	68.8A	5000W	-55°C ~ 175°C	Active	ROHS3 Compliant
5.0SMDJ45A-T7	Littelfuse Inc.	45V	72.7V	68.8A	5000W	-65°C ~ 150°C	Active	ROHS3 Compliant
SMCJ45A	Meritek	45V	72.7V	20.63A	1500W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMCJ45A-TP	Micro Commercial Co	45V	72.7V	20.6A	1500W	-55°C ~ 175°C	Active	ROHS3 Compliant
SMDJ45A	Alpha & Omega Semiconductor Inc.	45V	72.7V	41.3A	3000W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMDJ45A-HR	Littelfuse Inc.	45V	72.7V	41.3A	3000W	-65°C ~ 150°C	Active	ROHS3 Compliant
SMDJ45A-HRA	Littelfuse Inc.	45V	72.7V	41.3A	3000W	-65°C ~ 150°C	Active	ROHS3 Compliant
SMDJ45A-HRAT7	Littelfuse Inc.	45V	72.7V	41.3A	3000W	-65°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Preferred for Drop-In Replacement):

SMLJ45A from Bourns Inc. is the primary direct equivalent. It maintains identical electrical specifications (45V standoff, 72.7V clamping, 41.2A peak pulse, 3000W power dissipation) and operating temperature range (-55°C ~ 150°C). As an active product with ROHS3 compliance and MSL 1 rating, it provides immediate production continuity with no design modification required.

Functionally Equivalent with Enhanced Ratings:

SMDJ45A from Alpha & Omega Semiconductor Inc. and the Littelfuse SMDJ45A-HR, SMDJ45A-HRA, and SMDJ45A-HRAT7 variants provide equivalent electrical performance (41.3A peak pulse, 3000W power dissipation) with active product status and full compliance. The Littelfuse variants offer extended lower temperature operation (-65°C minimum) suitable for harsh environment applications.

Higher Power Rating Alternatives:

5.0SMDJ45A from Taiwan Semiconductor Corporation and 5.0SMDJ45A-T7 from Littelfuse Inc. provide enhanced current handling (68.8A peak pulse) and power dissipation (5000W), with extended upper temperature limits (175°C). These are suitable for applications requiring additional thermal margin or higher transient energy absorption.

Lower Power Rating Alternatives:

SMCJ45A from Meritek and SMCJ45A-TP from Micro Commercial Co provide reduced current ratings (20.6A ~ 20.63A) and power dissipation (1500W). These are suitable only for applications with lower transient energy requirements and should not be used as direct replacements for the original 3000W specification without circuit analysis.

All recommended substitutes maintain DO-214AB (SMC) package compatibility, surface mount configuration, and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can SMLJ45A directly replace CD214L-T45ALF without circuit modification?

A: Yes. SMLJ45A is a direct equivalent with identical voltage ratings (45V standoff, 72.7V clamping), current specifications (41.2A peak pulse), and power dissipation (3000W). Both use DO-214AB (SMC) surface mount packaging. The only difference is product status (active vs. obsolete) and packaging format (tape & reel vs. bulk).

Q: What is the difference between SMDJ45A and SMLJ45A?

A: Both maintain identical electrical specifications for the CD214L-T45ALF application. SMLJ45A is manufactured by Bourns Inc. (original manufacturer), while SMDJ45A is from Alpha & Omega Semiconductor Inc. Both are active products with ROHS3 compliance and equivalent performance.

Q: Can I use 5.0SMDJ45A-T7 as a substitute?

A: Yes, with consideration for application requirements. 5.0SMDJ45A-T7 provides higher peak pulse current (68.8A) and power dissipation (5000W) compared to the original 41.2A and 3000W specification. This provides additional transient energy absorption capability and extended temperature range (-65°C ~ 150°C). Use is appropriate for applications requiring enhanced protection margin.

Q: Why do SMCJ45A and SMCJ45A-TP have lower current ratings?

A: SMCJ45A and SMCJ45A-TP are rated for 20.6A ~ 20.63A peak pulse current and 1500W power dissipation, approximately half the original specification. These parts maintain voltage compatibility but are suitable only for lower-energy transient applications. Direct substitution is not recommended without circuit analysis confirming reduced transient energy requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, matching the original CD214L-T45ALF compliance profile.

Q: What is the difference between SMDJ45A-HR, SMDJ45A-HRA, and SMDJ45A-HRAT7?

A: All three Littelfuse variants (SMDJ45A-HR, SMDJ45A-HRA, SMDJ45A-HRAT7) provide identical electrical specifications (45V standoff, 72.7V clamping, 41.3A peak pulse, 3000W power dissipation) and extended lower temperature operation (-65°C minimum). The suffix designations indicate packaging and tape configuration variants. Selection depends on procurement and assembly requirements.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all parts meet the application's electrical requirements. For designs requiring 3000W dissipation at 41.2A peak pulse, use SMLJ45A, SMDJ45A, or Littelfuse SMDJ45A variants. For designs with lower transient energy, SMCJ45A variants are acceptable. Mixing parts with different power ratings (3000W vs. 5000W vs. 1500W) is acceptable if circuit analysis confirms compatibility with the lowest-rated component.

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