DL4731A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL4731A-TP is a 4.3 V, 1 W surface mount zener diode manufactured by Micro Commercial Co in MELF (DO-213AB) package format. This component is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing design requirements and production continuity. Substitute parts must maintain identical electrical specifications and mechanical compatibility to ensure direct replacement capability in existing circuit designs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	4.3	V
Tolerance	±5	%
Power - Maximum	1	W
Impedance (Maximum)	9	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 1 V
Voltage - Forward (Maximum) @ 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

Substitute Part Grouping Explanation

Substitute parts for the DL4731A-TP are selected based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

Zener voltage: 4.3 V nominal
Power rating: 1 W maximum
Impedance: 9 Ohms maximum
Reverse leakage current: 10 µA @ 1 V (or lower)
Forward voltage: 1.2 V maximum @ 200 mA
Operating temperature range: -65°C to 175°C minimum
Package format: DO-213AB / MELF surface mount
RoHS3 compliance

All identified substitute parts meet or exceed these electrical specifications and maintain mechanical compatibility with the original DL4731A-TP footprint and mounting requirements.

Parameter Comparison

Parameter	DL4731A-TP	ZM4731A-GS08	1N4731AUR/TR	CDLL3824A/TR
Manufacturer	Micro Commercial Co	Vishay General Semiconductor	Microchip Technology	Microchip Technology
Product Status	Obsolete	Active	Active	Active
Voltage - Zener (Nom)	4.3 V	4.3 V	4.3 V	4.3 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W	1 W
Impedance (Max)	9 Ohms	9 Ohms	9 Ohms	9 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 1 V	10 µA @ 1 V	10 µA @ 1 V	5 µA @ 1 V
Voltage - Forward (Max) @ If	1.2 V @ 200 mA	Not specified	1.2 V @ 200 mA	1.2 V @ 200 mA
Operating Temperature	-65°C ~ 175°C	175°C	-65°C ~ 175°C	-65°C ~ 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AB, MELF	DO-213AB, MELF (Glass)	DO-213AB, MELF (Glass)	DO-213AB, MELF
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Not specified	Cut Tape (CT)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

ZM4731A-GS08 (Vishay General Semiconductor)

This substitute provides direct electrical equivalence with automotive-grade qualification (AEC-Q101). The part is actively manufactured and maintains all critical electrical parameters. The automotive qualification indicates enhanced reliability screening and process controls. This option is suitable for applications requiring automotive-grade components or where extended supply chain assurance is required.

1N4731AUR/TR (Microchip Technology)

This substitute provides complete parametric equivalence, including specified forward voltage characteristics and full operating temperature range (-65°C to 175°C). Active product status ensures long-term availability. Tape & Reel packaging supports high-volume production environments.

CDLL3824A/TR (Microchip Technology)

This substitute meets all electrical specifications with improved reverse leakage performance (5 µA @ 1 V versus 10 µA @ 1 V). The lower leakage current provides enhanced performance margin in voltage regulation applications. Active product status and Tape & Reel packaging support production continuity.

All three substitutes maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original DL4731A-TP component.

Frequently Asked Questions (FAQ)

Q: Can the ZM4731A-GS08 be used as a direct replacement for DL4731A-TP?

A: Yes. The ZM4731A-GS08 maintains identical zener voltage (4.3 V), power rating (1 W), impedance (9 Ohms), and reverse leakage specifications (10 µA @ 1 V). Both components use DO-213AB MELF surface mount packaging. The primary difference is product status (active versus obsolete) and automotive qualification of the Vishay part.

Q: What is the difference between the three substitute options?

A: All three substitutes meet the core electrical specifications of the DL4731A-TP. The ZM4731A-GS08 offers automotive-grade qualification. The 1N4731AUR/TR and CDLL3824A/TR are Microchip products with identical zener and forward voltage specifications. The CDLL3824A/TR provides lower reverse leakage current (5 µA versus 10 µA), offering improved performance margin in certain applications.

Q: Are there packaging differences between these substitutes?

A: Yes. The ZM4731A-GS08 is supplied in Cut Tape (CT) format, while both Microchip parts (1N4731AUR/TR and CDLL3824A/TR) are supplied in Tape & Reel (TR) format. All three maintain the same DO-213AB MELF physical package for PCB mounting compatibility.

Q: Do all substitutes support the full operating temperature range?

A: The 1N4731AUR/TR and CDLL3824A/TR support the complete -65°C to 175°C range specified for the DL4731A-TP. The ZM4731A-GS08 specifies 175°C maximum operating temperature without explicit lower temperature limit documentation.

Q: Are these substitutes RoHS compliant?

A: Yes. All three substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original DL4731A-TP component.

Q: Which substitute should be selected for new designs?

A: Selection depends on application requirements. For automotive applications, the ZM4731A-GS08 with AEC-Q101 qualification is appropriate. For general industrial applications requiring full temperature range operation, the 1N4731AUR/TR or CDLL3824A/TR provide equivalent performance. The CDLL3824A/TR offers the lowest reverse leakage current for precision voltage regulation circuits.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message