CD214L-T51ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T51ALF is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc., rated for 51V reverse standoff voltage with 82.4V maximum clamping voltage and 36.4A peak pulse current in a surface mount DO-214AB (SMC) package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	51V
Voltage - Breakdown (Min)	56.7V
Voltage - Clamping (Max) @ Ipp	82.4V
Current - Peak Pulse (10/1000µs)	36.4A
Power - Peak Pulse	3000W (3kW)
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	DO-214AB, SMC
Type	Zener, Unidirectional
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 51V (exact match required)
Voltage - Breakdown (Min): 56.7V (exact match required)
Voltage - Clamping (Max) @ Ipp: 82.4V (exact match required)
Package / Case: DO-214AB, SMC (exact match required)
Type: Zener, Unidirectional (exact match required)

Secondary Consideration:

Current - Peak Pulse (10/1000µs): Substitutes with equal or higher ratings are acceptable
Power - Peak Pulse: Substitutes with equal or higher ratings are acceptable
Operating Temperature Range: Substitutes with equal or wider ranges are acceptable

Substitute parts are grouped into two categories: direct equivalents (matching all primary criteria with identical current and power ratings) and compatible alternatives (matching all primary criteria with enhanced current and power ratings).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Product Status	Package
CD214L-T51ALF	Bourns Inc.	51V	56.7V	82.4V	36.4A	3000W	-55°C ~ 150°C	Obsolete	DO-214AB, SMC
SMLJ51A	Bourns Inc.	51V	56.7V	82.4V	36.4A	3000W	-55°C ~ 150°C	Active	DO-214AB, SMC
SMDJ51A	Alpha & Omega Semiconductor Inc.	51V	56.7V	82.4V	36.5A	3000W	-55°C ~ 150°C	Active	DO-214AB, SMC
SMDJ51A-HR	Littelfuse Inc.	51V	56.7V	82.4V	36.4A	3000W	-65°C ~ 150°C	Active	DO-214AB, SMC
SMDJ51A-HRA	Littelfuse	51V	56.7V	82.4V	36.4A	3000W	-65°C ~ 150°C	Active	DO-214AB, SMC
SMDJ51A-HRAT7	Littelfuse	51V	56.7V	82.4V	36.4A	3000W	-65°C ~ 150°C	Active	DO-214AB, SMC
5.0SMDJ51A	Taiwan Semiconductor Corporation	51V	56.7V	82.4V	60.7A	5000W	-55°C ~ 175°C	Active	DO-214AB, SMC
5.0SMDJ51A-T7	Littelfuse Inc.	51V	56.7V	82.4V	60.7A	5000W	-65°C ~ 150°C	Active	DO-214AB, SMC
SMCJ51A	MDD	51V	56.7V	82.4V	18.2A	1500W	-50°C ~ 150°C	Active	DO-214AB, SMC
SMCJ51A-TP	Micro Commercial Co	51V	56.7V	82.4V	18.2A	1500W	-55°C ~ 175°C	Active	DO-214AB, SMC

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

SMLJ51A (Bourns Inc.) is the primary direct equivalent, offering identical electrical specifications and operating temperature range to the CD214L-T51ALF while maintaining active product status. This part is available in high volume (28,264 pcs) and maintains the same manufacturer lineage.

SMDJ51A (Alpha & Omega Semiconductor Inc.) provides equivalent performance with marginally higher peak pulse current (36.5A vs 36.4A) and active status. This part is widely available (12,400 pcs).

Enhanced Performance Alternatives:

SMDJ51A-HR and SMDJ51A-HRA (Littelfuse Inc.) offer identical electrical specifications with extended lower operating temperature limit (-65°C vs -55°C), providing broader thermal coverage while maintaining 3kW power rating and active status.

5.0SMDJ51A (Taiwan Semiconductor Corporation) and 5.0SMDJ51A-T7 (Littelfuse Inc.) provide enhanced current handling (60.7A vs 36.4A) and power dissipation (5kW vs 3kW) within the same voltage class and package. These are suitable for applications requiring higher transient energy absorption.

Limited Capacity Alternatives:

SMCJ51A (MDD) and SMCJ51A-TP (Micro Commercial Co) maintain voltage specifications but with reduced current (18.2A) and power (1.5kW) ratings. These are suitable only for lower-energy transient suppression applications.

All substitute parts maintain ROHS3 compliance and DO-214AB (SMC) package compatibility with the original CD214L-T51ALF.

Frequently Asked Questions (FAQ)

Q: Can SMLJ51A directly replace CD214L-T51ALF?

A: Yes. SMLJ51A matches all primary electrical parameters (51V standoff, 56.7V breakdown, 82.4V clamping, 36.4A peak pulse, 3kW power) and package specification (DO-214AB, SMC). Operating temperature range is identical (-55°C ~ 150°C). The part is in active production status.

Q: What is the difference between SMDJ51A and SMDJ51A-HR?

A: Both parts share identical voltage and power specifications (51V standoff, 82.4V clamping, 36.4A peak pulse, 3kW power). SMDJ51A-HR extends the lower operating temperature limit to -65°C (versus -55°C for standard SMDJ51A), providing enhanced cold-temperature performance.

Q: Can I use 5.0SMDJ51A instead of CD214L-T51ALF?

A: Yes, with consideration for application requirements. 5.0SMDJ51A maintains identical voltage specifications but provides enhanced current handling (60.7A vs 36.4A) and power dissipation (5kW vs 3kW). This higher rating is suitable for applications with greater transient energy, though it may introduce unnecessary cost if the original 3kW specification is sufficient.

Q: Why are SMCJ51A and SMCJ51A-TP listed as alternatives if they have lower current ratings?

A: These parts maintain the critical voltage specifications (51V standoff, 82.4V clamping) and package compatibility but with reduced current capacity (18.2A vs 36.4A) and power rating (1.5kW vs 3kW). They are suitable only for applications with lower transient energy requirements than the original design.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the environmental certification of the original CD214L-T51ALF.

Q: What packaging options are available for substitutes?

A: All substitute parts use the DO-214AB (SMC) surface mount package, maintaining mechanical and thermal compatibility with the original CD214L-T51ALF. Some variants are available in Tape & Reel (TR) packaging for automated assembly.

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