1N5259 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5259 is a through-hole zener diode rated at 39 V nominal voltage with 500 mW maximum power dissipation in a DO-35 axial package. Manufactured by SMC Diode Solutions, this component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement. The 1N5259 operates across a temperature range up to 200°C and is suitable for voltage regulation and protection applications requiring precise zener characteristics at the specified voltage level.

Substiute Parts

1N5259

SMC Diode SolutionsIn Stock: 9331N5259 Datasheet

Current PartRFQ

1N5259B TR PBFREE

Central Semiconductor CorpIn Stock: 106401N5259B TR PBFREE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 1N5259 is determined by electrical and mechanical parameter equivalence. The primary substitution criteria are:

Electrical Parameters:

• Zener voltage: 39 V nominal
• Maximum power dissipation: 500 mW
• Impedance (maximum): 80 Ohms
• Reverse leakage current: 100 nA @ 30 V
• Forward voltage: 1.1 V @ 200 mA

Mechanical Parameters:

• Package type: DO-35 axial through-hole configuration
• Mounting: Through-hole compatible with DO-204AH footprint

Compliance & Status:

• Active product status required for ongoing availability
• REACH and ECCN compliance maintained

The 1N5259B TR PBFREE from Central Semiconductor Corp satisfies all electrical and mechanical requirements while offering active product status and enhanced temperature range specification.

Parameter Comparison

Engineering Selection Recommendations

The 1N5259B TR PBFREE from Central Semiconductor Corp is the direct functional equivalent for the obsolete 1N5259. Selection of this substitute is based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match the original specification, including zener voltage (39 V), power rating (500 mW), impedance (80 Ohms maximum), reverse leakage current (100 nA @ 30 V), and forward voltage (1.1 V @ 200 mA).

Mechanical Compatibility: Both components utilize identical DO-35 axial through-hole packaging, ensuring direct footprint compatibility without circuit board redesign.

Product Status: The 1N5259B TR PBFREE maintains active product status with established supply chain availability, addressing the obsolescence of the original 1N5259.

Compliance & Certifications: The substitute maintains REACH compliance and EAR99 ECCN classification consistent with the original part. Additionally, the substitute provides ROHS3 compliance and lead-free construction, meeting modern regulatory requirements.

Enhanced Specifications: The substitute offers a defined zener voltage tolerance of ±5% and an extended operating temperature range of -65°C to 200°C, providing improved performance margins over the original specification.

Frequently Asked Questions (FAQ)

Q: Can the 1N5259B TR PBFREE be used as a direct replacement for the 1N5259?

A: Yes. The 1N5259B TR PBFREE provides electrical and mechanical equivalence across all specified parameters, including zener voltage, power dissipation, impedance, leakage current, forward voltage, and DO-35 axial package configuration. No circuit modifications are required.

Q: What is the difference between the 1N5259 and 1N5259B TR PBFREE?

A: The primary differences are product status and compliance. The 1N5259 is obsolete; the 1N5259B TR PBFREE is active. The substitute includes a defined zener voltage tolerance of ±5%, an extended operating temperature minimum of -65°C, and ROHS3 compliance with lead-free construction.

Q: Are there packaging differences between these parts?

A: No. Both components use the DO-35 axial through-hole package (DO-204AH designation). They are mechanically and electrically interchangeable at the board level.

Q: Does the ±5% zener voltage tolerance of the substitute affect circuit performance?

A: The ±5% tolerance specification on the 1N5259B TR PBFREE represents a defined manufacturing tolerance. This tolerance is tighter than the unspecified tolerance of the original 1N5259 and provides improved voltage regulation consistency in applications requiring precise zener characteristics.

Q: Is the extended temperature range of the substitute (-65°C to 200°C) relevant for my application?

A: The extended minimum operating temperature of -65°C on the 1N5259B TR PBFREE provides additional operational margin for applications exposed to low-temperature environments. If your application operates only at or above room temperature, this specification does not affect performance.

Q: What is the significance of ROHS3 compliance on the substitute?

A: ROHS3 compliance indicates lead-free construction and compliance with current European Union Restriction of Hazardous Substances regulations. This is relevant for applications subject to environmental or procurement standards requiring lead-free components.

Q: Can I use the 1N5259B TR PBFREE in existing designs without qualification?

A: The 1N5259B TR PBFREE is electrically and mechanically equivalent to the 1N5259 across all specified parameters. Direct substitution is supported without design changes. Compliance with your organization's component qualification procedures is required.