1N5259B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5259B-TP is a 39 V, 500 mW Zener diode manufactured by Micro Commercial Co in a DO-35 through-hole package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical specifications and mechanical compatibility while offering active product status and improved availability.

Substiute Parts

1N5259B-TP

Micro Commercial CoIn Stock: 11361N5259B-TP Datasheet

Current PartRFQ

1N5259B TR PBFREE

Central Semiconductor CorpIn Stock: 106401N5259B TR PBFREE Datasheet

DirectRFQ

1N5259

Microchip TechnologyIn Stock: 7701N5259 Datasheet

SimilarRFQ

1N5259B-1

Microchip TechnologyIn Stock: 9771N5259B-1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N5259B-TP is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Zener voltage: 39 V nominal
• Power dissipation: 500 mW maximum
• Voltage tolerance: ±5%
• Impedance: 80 Ohms maximum
• Reverse leakage current: 100 nA @ 30 V
• Forward voltage: 1.1 V @ 200 mA
• Package type: DO-35 through-hole
• Mounting configuration: Axial leads

Substitute parts are classified into two categories:

Direct Equivalents: Parts meeting all electrical specifications and maintaining identical forward voltage characteristics. These parts are fully interchangeable in circuit applications.

Compatible Alternatives: Parts meeting core electrical specifications (voltage, power, tolerance, impedance, reverse leakage) but with variations in forward voltage or operating temperature range. These parts function identically in zener regulation applications but may require thermal analysis in forward-biased circuits.

Parameter Comparison

Engineering Selection Recommendations

1N5259B TR PBFREE (Central Semiconductor Corp)

This part is the primary direct equivalent to the 1N5259B-TP. It maintains identical electrical specifications including 39 V nominal zener voltage, ±5% tolerance, 500 mW power rating, 80 Ohms impedance, 100 nA reverse leakage, and 1.1 V forward voltage. The part is currently in active production status with ROHS3 compliance and REACH unaffected certification. Operating temperature range extends to -65 to 200°C, providing superior thermal performance compared to the obsolete original. This part is suitable for direct substitution in all applications.

1N5259B-1 (Microchip Technology)

This part meets all core electrical specifications of the 1N5259B-TP with identical zener voltage, tolerance, power rating, impedance, and reverse leakage characteristics. The part is in active production status. Forward voltage specification differs at 1.5 V @ 200 mA compared to 1.1 V @ 200 mA for the original. Operating temperature range is -65 to 175°C. This part is suitable for zener regulation applications where forward voltage variation does not impact circuit performance.

1N5259 (Microchip Technology)

This part shares the same 39 V nominal zener voltage, 500 mW power rating, and 80 Ohms impedance as the 1N5259B-TP. Voltage tolerance is specified at ±20% compared to ±5% for the original, representing a wider tolerance band. Reverse leakage current is specified at 10 µA @ 29 V compared to 100 nA @ 30 V for the original. Forward voltage is 1.5 V @ 200 mA. This part is in active production status. Selection of this part requires confirmation that the ±20% tolerance and higher reverse leakage current are acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can 1N5259B TR PBFREE replace 1N5259B-TP directly?

A: Yes. The 1N5259B TR PBFREE maintains identical electrical specifications including 39 V zener voltage, ±5% tolerance, 500 mW power, 80 Ohms impedance, 100 nA reverse leakage, and 1.1 V forward voltage. Both parts use DO-35 through-hole packaging. This part is a direct equivalent.

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

A: Both parts share identical zener voltage (39 V), tolerance (±5%), power (500 mW), impedance (80 Ohms), and reverse leakage (100 nA @ 30 V) specifications. The difference is forward voltage: 1N5259B-1 specifies 1.5 V @ 200 mA while 1N5259B TR PBFREE specifies 1.1 V @ 200 mA. For zener regulation applications, this difference is typically not significant. For forward-biased applications, the lower forward voltage of 1N5259B TR PBFREE may be preferred.

Q: Why does 1N5259 have different specifications?

A: The 1N5259 is a variant with relaxed specifications. Voltage tolerance is ±20% instead of ±5%, and reverse leakage current is 10 µA @ 29 V instead of 100 nA @ 30 V. These differences reflect a different product grade. Selection requires confirmation that the application tolerates wider voltage tolerance and higher leakage current.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts are supplied in DO-35 through-hole axial package configuration, identical to the 1N5259B-TP. Mechanical compatibility is maintained across all substitutes.

Q: What is the operating temperature advantage of 1N5259B TR PBFREE?

A: The 1N5259B TR PBFREE operates from -65 to 200°C compared to -55 to 150°C for the 1N5259B-TP. This extended range provides improved performance in high-temperature environments and offers greater design margin for thermal stress conditions.

Q: Are all substitute parts RoHS and REACH compliant?

A: The 1N5259B TR PBFREE is explicitly specified as ROHS3 compliant and REACH unaffected. The 1N5259B-1 and 1N5259 are specified as REACH unaffected. RoHS compliance status for 1N5259B-1 and 1N5259 is not provided in the available specifications.