1N5259B-T Equivalent & Substitute Parts

Part Overview

The 1N5259B-T is a Zener diode rated at 39 V nominal voltage with 500 mW maximum power dissipation, packaged in a DO-204AH (DO-35) through-hole axial configuration. Manufactured by Vishay General Semiconductor - Diodes Division, this component is qualified to AEC-Q101 automotive standards and complies with ROHS3 regulations.

The 1N5259B-T is classified as obsolete. Locating substitute components with equivalent electrical and mechanical specifications is necessary to support ongoing maintenance, repair, and legacy system support where this diode is specified in original designs.

Substiute Parts

1N5259B-T

Vishay General Semiconductor - Diodes DivisionIn Stock: 11971N5259B-T Datasheet

Current PartRFQ

1N5259B-TR

Vishay General Semiconductor - Diodes DivisionIn Stock: 72621N5259B-TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Critical Matching Parameters:

• Zener voltage: 39 V nominal
• Tolerance: ±5%
• Maximum power dissipation: 500 mW
• Package type: DO-204AH (DO-35) through-hole axial
• Reverse leakage current: 100 nA @ 30 V
• Forward voltage: 1.1 V @ 200 mA
• Automotive grade qualification: AEC-Q101
• RoHS compliance: ROHS3

The 1N5259B-TR is a direct electrical and mechanical equivalent to the 1N5259B-T. Both components share the same base product number (1N5259), identical electrical ratings, and automotive qualification. The primary distinction is packaging format: the 1N5259B-T is supplied in standard packaging, while the 1N5259B-TR is supplied in cut tape (CT) format. Both are manufactured by Vishay General Semiconductor - Diodes Division and maintain full compatibility in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The 1N5259B-TR is a direct substitute for the 1N5259B-T in all circuit applications. Both components are manufactured by the same supplier, carry identical electrical specifications, and maintain AEC-Q101 automotive qualification with ROHS3 compliance.

The 1N5259B-TR offers the following advantages:

Product Status: The 1N5259B-TR maintains active product status, ensuring continued availability and manufacturing support. The 1N5259B-T is obsolete and subject to supply discontinuation.

Impedance Performance: The 1N5259B-TR exhibits lower maximum impedance (80 Ohms versus 800 Ohms), which represents improved dynamic performance characteristics within the specified electrical envelope.

Operating Temperature Range: The 1N5259B-TR specifies a minimum operating temperature of -65°C, providing extended low-temperature capability compared to the main part.

Packaging Format: The 1N5259B-TR is supplied in cut tape (CT) format, suitable for automated assembly processes. The main part packaging format is not specified. Both maintain identical through-hole DO-35 package geometry and are mechanically interchangeable on printed circuit boards.

For new designs, legacy system support, and component replenishment, the 1N5259B-TR is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Are the 1N5259B-T and 1N5259B-TR electrically interchangeable?

A: Yes. Both components share identical zener voltage (39 V), tolerance (±5%), maximum power rating (500 mW), reverse leakage current (100 nA @ 30 V), and forward voltage characteristics (1.1 V @ 200 mA). They are direct electrical equivalents.

Q: What is the difference between these two part numbers?

A: The primary difference is packaging format. The 1N5259B-TR is supplied in cut tape (CT) format for automated assembly, while the 1N5259B-T packaging format is not specified. Both use identical DO-204AH (DO-35) through-hole axial packages and are mechanically interchangeable on circuit boards.

Q: Can I use the 1N5259B-TR as a replacement for the 1N5259B-T in existing designs?

A: Yes. The 1N5259B-TR is a direct substitute. Both components are AEC-Q101 qualified, ROHS3 compliant, and manufactured by Vishay General Semiconductor - Diodes Division. No circuit modifications are required.

Q: Why is the 1N5259B-T listed as obsolete?

A: The 1N5259B-T has been discontinued by the manufacturer. The 1N5259B-TR remains in active production and is the recommended source for this component specification.

Q: Does the lower impedance of the 1N5259B-TR affect circuit performance?

A: The 1N5259B-TR impedance specification (80 Ohms maximum) is lower than the 1N5259B-T (800 Ohms maximum). Lower impedance represents improved dynamic response. Both values fall within acceptable ranges for standard zener diode applications and do not introduce incompatibility.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the 1N5259B-T and 1N5259B-TR carry automotive grade classification and AEC-Q101 qualification, meeting automotive industry reliability and quality standards.

Q: What is the operating temperature range for each part?

A: The 1N5259B-T specifies a maximum operating temperature of 175°C. The 1N5259B-TR specifies an operating range of -65°C to 175°C, providing extended low-temperature capability. Both are suitable for standard industrial and automotive temperature environments.