1N4731A_S00Z Equivalent & Substitute Parts

Part Overview

The 1N4731A_S00Z is a Zener diode rated at 4.3 V nominal with 1 W maximum power dissipation, packaged in a through-hole DO-41 configuration. This component is classified as obsolete, indicating that the original manufacturer (onsemi) has discontinued production. Locating equivalent substitute parts is necessary to maintain design continuity and ensure component availability for repair, maintenance, and new production builds.

Substiute Parts

1N4731A_S00Z

onsemiIn Stock: 7731N4731A_S00Z Datasheet

Current PartRFQ

1N4731A BK TIN/LEAD

Central Semiconductor CorpIn Stock: 23761N4731A BK TIN/LEAD Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N4731A_S00Z is determined by matching the following critical electrical and mechanical parameters:

• Zener Voltage (Vz): 4.3 V nominal with ±5% tolerance
• Power Rating: 1 W maximum dissipation
• Impedance: 9 Ohms maximum
• Reverse Leakage Current: 10 µA @ 1 V
• Operating Temperature Range: -65°C to 200°C (TJ)
• Package Configuration: DO-41 through-hole axial package
• Moisture Sensitivity: MSL 1 (Unlimited)

Substitute parts must satisfy all of these parameters to ensure functional and mechanical compatibility within the original circuit design. The 1N4731A BK TIN/LEAD from Central Semiconductor Corp meets all specified criteria.

Parameter Comparison

Engineering Selection Recommendations

The 1N4731A BK TIN/LEAD manufactured by Central Semiconductor Corp is a direct functional and mechanical substitute for the obsolete 1N4731A_S00Z. The substitute part maintains identical electrical specifications across all critical parameters, including zener voltage, power rating, impedance, and reverse leakage characteristics.

The substitute part carries Active product status, ensuring ongoing availability and supply chain continuity. Both parts comply with REACH regulations and carry EAR99 export classification. The substitute part is RoHS3 compliant, providing additional environmental and regulatory alignment for modern manufacturing standards.

The through-hole DO-41 axial package configuration is identical between both parts, permitting direct board-level substitution without circuit layout modifications or mechanical redesign.

Frequently Asked Questions (FAQ)

Q: Can the 1N4731A BK TIN/LEAD be used as a direct replacement for the 1N4731A_S00Z?

A: Yes. Both parts share identical electrical specifications (4.3 V zener voltage, 1 W power rating, 9 Ohms impedance, 10 µA reverse leakage) and are packaged in the same DO-41 through-hole axial configuration. Direct substitution is supported without circuit modifications.

Q: What is the significance of the product status difference (Obsolete vs. Active)?

A: The original 1N4731A_S00Z is obsolete, meaning onsemi has discontinued production. The 1N4731A BK TIN/LEAD from Central Semiconductor Corp maintains Active status, confirming current manufacturing and availability. This substitution addresses supply chain continuity.

Q: Are there any compliance or certification differences between the two parts?

A: Both parts are REACH Unaffected and carry EAR99 export classification. The substitute part is additionally RoHS3 compliant, which may be required for certain applications or markets. Both parts carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: Does the packaging designation "Bulk" for the substitute part affect compatibility?

A: No. The packaging designation refers to the supplier's delivery format (bulk quantity) rather than the component package itself. Both parts use the identical DO-41 through-hole axial package for circuit board installation.

Q: Are there any electrical performance differences in forward voltage characteristics?

A: The substitute part specifies a forward voltage (Vf) of 1.2 V @ 200 mA. This parameter is not specified for the original part in the provided data. Both parts maintain identical zener voltage and reverse leakage specifications, which are the primary operating characteristics for zener diode function.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. The identical DO-41 axial package, lead spacing, and electrical specifications permit direct board-level substitution without PCB redesign or component repositioning.