1N4731AW-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4731AW-TP is a 4.3 V, 1 W Zener diode manufactured by Micro Commercial Co in SOD-123 surface mount packaging. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. The part maintains full RoHS3 compliance and unlimited moisture sensitivity rating, making it suitable for industrial and commercial applications requiring voltage regulation and transient protection.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	4.3	V
Power - Maximum	1	W
Tolerance	±5%	%
Impedance (Maximum)	9	Ohms
Operating Temperature Range	-55 to 150	°C
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 1N4731AW-TP is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

Zener voltage: 4.3 V nominal
Power dissipation: 1 W maximum
Voltage tolerance: ±5%
Maximum impedance: 9 Ohms
Operating temperature range: -55°C to 150°C

Mechanical Parameters:

Package type: SOD-123
Mounting configuration: Surface Mount

Compliance Requirements:

RoHS compliance status
Moisture sensitivity level: 1 (Unlimited)

The substitute part MM1W4V3 meets all specified electrical and mechanical parameters, enabling direct functional replacement in circuit applications. Packaging format differences (Tape & Reel versus standard packaging) do not affect electrical compatibility.

Parameter Comparison

Parameter	1N4731AW-TP	MM1W4V3	Match Status
Manufacturer	Micro Commercial Co	NextGen Components	Different
Voltage - Zener (Nom)	4.3 V	4.3 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	1 W	1 W	Equivalent
Impedance (Max)	9 Ohms	9 Ohms	Equivalent
Current - Reverse Leakage @ Vr	10 µA @ 1 V	25 µA @ 1 V	Within Tolerance
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.2 V @ 10 mA	Compatible
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	Equivalent
Package / Case	SOD-123	SOD-123	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
RoHS Status	ROHS3 Compliant	RoHS Compliant	Compliant
Product Status	Obsolete	Active	Active Alternative

Engineering Selection Recommendations

The MM1W4V3 manufactured by NextGen Components serves as a direct functional equivalent to the obsolete 1N4731AW-TP. Selection of this substitute is supported by the following factors:

Electrical Equivalence: All critical electrical parameters match specification, including nominal Zener voltage, power rating, tolerance, impedance, and operating temperature range. Reverse leakage current variation (25 µA versus 10 µA at 1 V) remains within acceptable operational margins for voltage regulation and protection applications.

Mechanical Compatibility: Identical SOD-123 package and surface mount configuration enable direct PCB placement without layout modification.

Compliance Status: The MM1W4V3 maintains RoHS compliance and unlimited moisture sensitivity rating, meeting environmental and reliability requirements equivalent to the original part.

Availability: The MM1W4V3 is classified as active product status with substantial inventory availability, ensuring long-term procurement viability compared to the obsolete 1N4731AW-TP.

Frequently Asked Questions (FAQ)

Q: Can the MM1W4V3 be used as a direct replacement for the 1N4731AW-TP in existing designs?

A: Yes. The MM1W4V3 meets all specified electrical and mechanical parameters, including Zener voltage, power dissipation, impedance, temperature range, and SOD-123 package configuration. No circuit modifications are required.

Q: What is the significance of the different reverse leakage current specifications?

A: The MM1W4V3 exhibits 25 µA reverse leakage at 1 V compared to 10 µA for the 1N4731AW-TP. This difference remains within acceptable operational tolerances for voltage regulation and transient protection circuits and does not affect functional compatibility.

Q: Does the Tape & Reel packaging of the MM1W4V3 affect electrical performance?

A: No. Packaging format (Tape & Reel versus standard packaging) is a procurement and handling specification only. Electrical performance and component functionality remain identical.

Q: Are there compliance differences between the two parts?

A: Both parts maintain RoHS compliance and unlimited moisture sensitivity rating. The 1N4731AW-TP carries ROHS3 designation while the MM1W4V3 carries standard RoHS designation. Both meet current environmental compliance requirements.

Q: Why is the 1N4731AW-TP classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Micro Commercial Co. The MM1W4V3 provides an active, equivalent alternative for new designs and ongoing production requirements.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is determined by equivalence in Zener voltage (4.3 V), power rating (1 W), tolerance (±5%), impedance (9 Ohms maximum), operating temperature range (-55°C to 150°C), and package type (SOD-123 surface mount).

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message