1N5259B_T50A Equivalent & Substitute Parts

Part Overview

The 1N5259B_T50A is a Zener diode rated at 39 V nominal voltage with 500 mW power dissipation, manufactured by onsemi in a DO-35 through-hole package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. The 39 V Zener voltage rating and 500 mW power rating define the functional requirements for substitution evaluation.

Substiute Parts

1N5259B_T50A

onsemiIn Stock: 10241N5259B_T50A Datasheet

Current PartRFQ

1N5259A

Microchip TechnologyIn Stock: 11141N5259A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N5259B_T50A is determined by the following critical parameters:

Primary Matching Criteria:

• Zener voltage: 39 V nominal
• Power dissipation: 500 mW maximum
• Package type: DO-35 through-hole
• Impedance: 80 Ohms maximum

Secondary Compatibility Factors:

• Reverse leakage current specification
• Forward voltage characteristics
• Operating temperature range
• Tolerance specification

The 1N5259A from Microchip Technology satisfies the primary matching criteria with identical Zener voltage, power rating, and package configuration. Both components share the same base product number (1N5259) and are functionally equivalent Zener diodes in the DO-35 package.

Parameter Comparison

Engineering Selection Recommendations

The 1N5259A from Microchip Technology is the direct functional equivalent for the obsolete 1N5259B_T50A. Both components share identical Zener voltage (39 V), power rating (500 mW), impedance specification (80 Ohms maximum), and DO-35 through-hole package configuration.

Selection Basis:

The 1N5259A is an active product with current manufacturing status, ensuring long-term availability and supply chain continuity. Both components are REACH Unaffected and classified under ECCN EAR99, maintaining equivalent regulatory compliance.

Parameter Deviations:

The 1N5259A exhibits a wider tolerance specification (±10% versus ±5%), a higher maximum forward voltage (1.5 V versus 1.2 V at 200 mA), and a narrower operating temperature range (-65 to 175°C versus -65 to 200°C). These deviations are within acceptable substitution parameters for standard Zener diode applications where the primary functional requirements are the 39 V Zener voltage and 500 mW power dissipation capability.

Frequently Asked Questions (FAQ)

Q: Can the 1N5259A directly replace the 1N5259B_T50A in existing designs?

A: Yes. Both components are 39 V, 500 mW Zener diodes in DO-35 packages with identical impedance specifications. The electrical characteristics are compatible for standard voltage regulation and overvoltage protection applications.

Q: What is the significance of the tolerance difference (±5% versus ±10%)?

A: The 1N5259B_T50A maintains a tighter tolerance specification. Applications requiring precise Zener voltage accuracy within ±5% must account for the 1N5259A's ±10% tolerance. For applications with broader voltage tolerance requirements, this difference is not significant.

Q: How does the forward voltage difference affect substitution?

A: The 1N5259A has a maximum forward voltage of 1.5 V at 200 mA compared to 1.2 V for the 1N5259B_T50A. This 0.3 V difference is negligible in most Zener diode applications where forward conduction is not the primary operating mode. Applications relying on forward bias characteristics should evaluate this parameter against specific circuit requirements.

Q: Are there temperature range limitations with the 1N5259A?

A: The 1N5259A operates from -65 to 175°C, compared to -65 to 200°C for the 1N5259B_T50A. Applications requiring operation above 175°C cannot use the 1N5259A. For standard industrial and commercial temperature ranges, this limitation is not restrictive.

Q: Is the DO-35 package identical between both components?

A: Yes. Both components use the DO-35 (DO-204AH) axial through-hole package. Physical dimensions, lead spacing, and PCB mounting characteristics are identical, enabling direct mechanical substitution without layout modifications.

Q: What is the RoHS compliance status of the 1N5259A?

A: The 1N5259A is RoHS non-compliant. Applications subject to RoHS requirements must evaluate this status against regulatory obligations. The 1N5259B_T50A RoHS status was not specified in the provided data.