CD214C-T45ALF Equivalent & Substitute Parts

Part Overview

The CD214C-T45ALF is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface mount applications. This component features a 45V reverse standoff voltage, 72.7V maximum clamping voltage, and 1500W peak pulse power rating in a DO-214AB (SMC) package. The part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214C-T45ALF
Manufacturer	Bourns Inc.
Product Status	Obsolete
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)	20.6A
Power - Peak Pulse	1500W
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	DO-214AB, SMC
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD214C-T45ALF is determined by strict electrical and mechanical compatibility criteria. All substitute parts must maintain the following parameters within acceptable tolerances:

Critical Matching Parameters:

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

Substitution Categories:

Direct Equivalents maintain identical electrical specifications and are pin-for-pin compatible:

SMCJ45A (Meritek) — Active status, identical 20.63A peak pulse current and 1500W power rating

Similar Substitutes share core voltage and package specifications but differ in peak pulse current and power dissipation capacity:

5.0SMDJ45A (Taiwan Semiconductor Corporation) — 68.8A peak pulse, 5000W power
5.0SMDJ45A-T7 (Littelfuse Inc.) — 68.8A peak pulse, 5000W power
SMCJ45A-HR (Littelfuse Inc.) — 20.6A peak pulse, 1500W power
SMCJ45A-HRA (Littelfuse Inc.) — 20.6A peak pulse, 1500W power
SMCJ45A-HRAT7 (Littelfuse Inc.) — 20.6A peak pulse, 1500W power
SMCJ45A-TP (Micro Commercial Co) — 20.6A peak pulse, 1500W power
SMDJ45A (Alpha & Omega Semiconductor Inc.) — 41.3A peak pulse, 3000W power

All substitute parts are RoHS3 compliant, surface mount, and rated for general-purpose applications.

Parameter Comparison

Part Number	Manufacturer	Status	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Operating Temp	Package	RoHS
CD214C-T45ALF	Bourns Inc.	Obsolete	45V	50V	72.7V	20.6A	1500W	-55°C ~ 150°C	DO-214AB (SMC)	ROHS3
SMCJ45A	Meritek	Active	45V	50V	72.7V	20.63A	1500W	-55°C ~ 150°C	DO-214AB (SMC)	ROHS3
5.0SMDJ45A	Taiwan Semiconductor Corporation	Active	45V	50V	72.7V	68.8A	5000W	-55°C ~ 175°C	DO-214AB (SMC)	ROHS3
5.0SMDJ45A-T7	Littelfuse Inc.	Active	45V	50V	72.7V	68.8A	5000W	-65°C ~ 150°C	DO-214AB (SMC)	ROHS3
SMCJ45A-HR	Littelfuse Inc.	Active	45V	50V	72.7V	20.6A	1500W	-65°C ~ 150°C	DO-214AB (SMC)	ROHS3
SMCJ45A-HRA	Littelfuse Inc.	Active	45V	50V	72.7V	20.6A	1500W	-65°C ~ 150°C	DO-214AB (SMC)	ROHS3
SMCJ45A-HRAT7	Littelfuse Inc.	Active	45V	50V	72.7V	20.6A	1500W	-65°C ~ 150°C	DO-214AB (SMC)	ROHS3
SMCJ45A-TP	Micro Commercial Co	Active	45V	50V	72.7V	20.6A	1500W	-55°C ~ 175°C	DO-214AB (SMC)	ROHS3
SMDJ45A	Alpha & Omega Semiconductor Inc.	Active	45V	50V	72.7V	41.3A	3000W	-55°C ~ 150°C	DO-214AB (SMC)	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, Identical Electrical Performance):

SMCJ45A (Meritek) is the primary direct equivalent. It maintains identical voltage specifications (45V standoff, 50V breakdown, 72.7V clamping), matching peak pulse current (20.63A), and power dissipation (1500W). The part is active, RoHS3 compliant, and available in high inventory (10,200 units). Operating temperature range (-55°C ~ 150°C) matches the original specification.

For Enhanced Performance Applications:

When higher transient current handling or power dissipation is required, the following parts provide increased capability while maintaining voltage compatibility:

SMDJ45A (Alpha & Omega Semiconductor Inc.) offers 41.3A peak pulse current and 3000W power dissipation, doubling the power handling capacity. This part is suitable for applications experiencing higher transient energy levels.

5.0SMDJ45A and 5.0SMDJ45A-T7 (Taiwan Semiconductor Corporation and Littelfuse Inc., respectively) provide maximum performance with 68.8A peak pulse current and 5000W power dissipation. These parts are appropriate for high-energy transient protection scenarios.

For Extended Temperature Range Applications:

SMCJ45A-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, compared to the original 150°C maximum. This part maintains 1500W power rating and 20.6A peak pulse current.

Compliance Considerations:

All substitute parts are RoHS3 compliant and carry EAR99 ECCN classification, matching the regulatory status of the original component. Moisture sensitivity level remains at MSL 1 (Unlimited) across all substitutes.

Frequently Asked Questions (FAQ)

Q: Can SMCJ45A directly replace CD214C-T45ALF without circuit modification?

A: Yes. SMCJ45A is a direct equivalent with identical voltage specifications (45V standoff, 72.7V clamping), matching peak pulse current (20.63A vs. 20.6A), and identical 1500W power rating. Both use DO-214AB (SMC) packaging and are pin-compatible. No circuit changes are required.

Q: What is the difference between the 1500W and 5000W rated parts?

A: Peak pulse power rating indicates the maximum transient energy the device can dissipate during a 10/1000µs pulse. The 1500W parts (SMCJ45A series) are suitable for standard overvoltage protection. The 5000W parts (5.0SMDJ45A series) handle higher transient energy and are specified for applications with more severe transient conditions. Voltage clamping characteristics remain identical.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification, matching the original CD214C-T45ALF specification.

Q: What is the significance of the -HR, -HRA, and -TP suffixes in Littelfuse and Micro Commercial Co part numbers?

A: These suffixes denote manufacturer-specific packaging, tape configuration, or lead finish variants. All variants listed maintain identical electrical specifications (45V standoff, 72.7V clamping, 20.6A peak pulse, 1500W power) and DO-214AB (SMC) package compatibility. Selection between variants depends on procurement and assembly requirements.

Q: Can I use SMDJ45A as a direct replacement?

A: SMDJ45A is electrically compatible but not a direct replacement. It maintains identical voltage specifications and DO-214AB packaging but provides higher peak pulse current (41.3A vs. 20.6A) and power dissipation (3000W vs. 1500W). Use this part only if the application requires enhanced transient current handling. Standard applications should use SMCJ45A for matched performance.

Q: What is the inventory status of substitute parts?

A: SMCJ45A (Meritek) has the highest availability at 10,200 units. SMDJ45A (Alpha & Omega) has 15,400 units. The 5.0SMDJ45A series has 9,300 units (Taiwan Semiconductor) and 2,052 units (Littelfuse). Littelfuse SMCJ45A variants range from 700 to 1,098 units. SMCJ45A-TP (Micro Commercial Co) has 3,898 units available.

Q: Are there temperature range differences between substitutes?

A: Yes. Most parts operate from -55°C to 150°C. SMCJ45A-TP and 5.0SMDJ45A extend to 175°C upper limit. The 5.0SMDJ45A-T7 and Littelfuse SMCJ45A variants extend the lower limit to -65°C. Verify application temperature requirements before selection.

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