DL4729A-TP Equivalent & Substitute Parts

Part Overview

The DL4729A-TP is a Zener diode rated at 3.6 V with 1 W power dissipation capability, manufactured by Micro Commercial Co in a surface mount MELF package. This component functions as a voltage regulator and protective device in electronic circuits requiring stable reference voltage or overvoltage suppression.

The DL4729A-TP carries an Obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.6	V
Tolerance	±5%	%
Power - Max	1	W
Impedance (Max)	10	Ohms
Current - Reverse Leakage @ Vr	100	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	—
Package / Case	DO-213AB, MELF	—
RoHS Status	ROHS3 Compliant	—
REACH Status	REACH Unaffected	—

Substitute Part Grouping Explanation

Substitute parts for the DL4729A-TP are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters:

Zener voltage (Nom): 3.6 V
Tolerance: ±5%
Maximum power dissipation: 1 W
Maximum impedance: 10 Ohms
Forward voltage: 1.2 V @ 200 mA
Operating temperature range: -65°C to 175°C

Mechanical Parameters:

Mounting type: Surface Mount
Package / Case: DO-213AB or MELF

Compliance Parameters:

RoHS3 Compliance
REACH Unaffected status

The CDLL3822A/TR meets all specified electrical and mechanical parameters and maintains full regulatory compliance, qualifying it as a parametric equivalent substitute.

Parameter Comparison

Parameter	DL4729A-TP	CDLL3822A/TR	Match Status
Manufacturer	Micro Commercial Co	Microchip Technology	Different
Product Status	Obsolete	Active	Substitute Available
Voltage - Zener (Nom)	3.6 V	3.6 V	Match
Tolerance	±5%	±5%	Match
Power - Max	1 W	1 W	Match
Impedance (Max)	10 Ohms	10 Ohms	Match
Current - Reverse Leakage @ Vr	100 µA @ 1 V	75 µA @ 1 V	Compatible
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA	Match
Operating Temperature Range	-65°C to 175°C	-65°C to 175°C	Match
Mounting Type	Surface Mount	Surface Mount	Match
Package / Case	DO-213AB, MELF	DO-213AB, MELF	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
REACH Status	REACH Unaffected	REACH Unaffected	Match

Engineering Selection Recommendations

The CDLL3822A/TR manufactured by Microchip Technology is a direct parametric equivalent to the obsolete DL4729A-TP. Selection of this substitute is supported by the following factors:

Product Status: The CDLL3822A/TR maintains Active product status, ensuring ongoing availability and manufacturer support, whereas the DL4729A-TP is Obsolete.

Electrical Equivalence: All critical electrical parameters match exactly, including zener voltage, power rating, impedance, and operating temperature range. The reverse leakage current of the CDLL3822A/TR (75 µA @ 1 V) is lower than the original part (100 µA @ 1 V), representing an improvement in performance characteristics.

Regulatory Compliance: Both components maintain ROHS3 compliance and REACH Unaffected status, ensuring compatibility with current environmental and regulatory requirements.

Package Compatibility: Both components utilize identical surface mount packaging (DO-213AB, MELF), enabling direct board-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the CDLL3822A/TR be used as a direct replacement for the DL4729A-TP?

A: Yes. The CDLL3822A/TR meets all specified electrical and mechanical parameters of the DL4729A-TP. Both components share identical zener voltage (3.6 V), power rating (1 W), tolerance (±5%), impedance (10 Ohms), forward voltage characteristics, operating temperature range, and surface mount MELF packaging.

Q: What is the difference in reverse leakage current between these parts?

A: The DL4729A-TP specifies 100 µA reverse leakage at 1 V, while the CDLL3822A/TR specifies 75 µA at 1 V. The lower leakage current of the substitute part represents improved performance and does not create compatibility issues in circuit applications.

Q: Are there any package or footprint differences?

A: No. Both the DL4729A-TP and CDLL3822A/TR utilize the DO-213AB MELF surface mount package. PCB footprints and assembly processes remain identical.

Q: What is the product status difference, and why does it matter?

A: The DL4729A-TP is classified as Obsolete, indicating discontinued manufacturing and limited availability. The CDLL3822A/TR maintains Active status, ensuring continued production, technical support, and supply chain availability for current and future applications.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the DL4729A-TP and CDLL3822A/TR are ROHS3 compliant and REACH Unaffected, meeting current environmental and regulatory standards for electronic component manufacturing and use.

Q: Can the CDLL3822A/TR be used in new designs?

A: Yes. The CDLL3822A/TR is an Active product suitable for new design implementations. Its electrical specifications, compliance certifications, and active manufacturing status make it appropriate for both replacement and new application development.

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