1N5259C-TR Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5259C-TR is a 39 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in DO-35 axial through-hole packaging. This component is classified as an active product with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified when equivalent electrical performance is required, packaging compatibility is maintained, and operational specifications align within acceptable tolerances for the application circuit.

Substiute Parts

1N5259C-TR

Vishay General Semiconductor - Diodes DivisionIn Stock: 10371N5259C-TR Datasheet

Current PartRFQ

1N5259B TR PBFREE

Central Semiconductor CorpIn Stock: 106401N5259B TR PBFREE Datasheet

MFR RecommendedRFQ

BZX79-B39,113

Nexperia USA Inc.In Stock: 10237BZX79-B39,113 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N5259C-TR is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage: 39 V nominal
• Through-hole axial mounting configuration (DO-35 package family)
• RoHS3 compliance and REACH unaffected status
• Operating temperature range compatibility
• Power dissipation capability

Secondary Compatibility Factors:

• Voltage tolerance (±2% to ±5% acceptable within circuit design margins)
• Impedance characteristics (80 to 130 Ohms maximum)
• Reverse leakage current specifications
• Forward voltage characteristics

Substitute parts must maintain the 39 V Zener voltage specification and support through-hole mounting. Variations in power rating, tolerance, and impedance are acceptable when the application circuit design accommodates the parameter differences.

Parameter Comparison

Engineering Selection Recommendations

1N5259B TR PBFREE (Central Semiconductor Corp)

This substitute maintains identical electrical specifications for Zener voltage (39 V), power rating (500 mW), and impedance (80 Ohms). The voltage tolerance is ±5% compared to the main part's ±2%, which is acceptable in applications where the circuit design accommodates this tolerance band. The extended operating temperature range (-65 to 200°C) provides additional thermal margin. ROHS3 compliance and REACH unaffected status align with regulatory requirements. This substitute is suitable for direct replacement in applications where the ±5% tolerance is within design specifications.

BZX79-B39,113 (Nexperia USA Inc.)

This substitute maintains the 39 V Zener voltage and ±2% tolerance matching the main part. The power rating is reduced to 400 mW, which represents a 20% decrease from the 500 mW specification. The impedance is increased to 130 Ohms (62.5% higher than the main part). This substitute is applicable only in applications where the circuit design accommodates the reduced power dissipation capability and higher impedance. The extended operating temperature range (-65 to 200°C) and improved reverse leakage characteristics (50 nA) provide operational advantages in specific thermal environments. ROHS3 compliance and REACH unaffected status are maintained.

Both substitutes are active products with full regulatory compliance. Selection between substitutes depends on whether the application prioritizes power handling capacity (1N5259B TR PBFREE) or impedance characteristics and reverse leakage performance (BZX79-B39,113).

Frequently Asked Questions (FAQ)

Q: Can the 1N5259B TR PBFREE replace the 1N5259C-TR in all applications?

A: The 1N5259B TR PBFREE is suitable for replacement in applications where the ±5% voltage tolerance is acceptable. Both parts share identical power ratings (500 mW), impedance (80 Ohms), and forward voltage characteristics. The extended temperature range of the substitute provides additional operational margin. Verify that circuit design specifications accommodate the ±5% tolerance band before substitution.

Q: What are the limitations of the BZX79-B39,113 as a substitute?

A: The BZX79-B39,113 has a reduced maximum power rating of 400 mW compared to the 500 mW specification of the main part. The impedance is also higher at 130 Ohms. This substitute is applicable only in circuits designed to operate within these reduced specifications. Applications requiring full 500 mW power dissipation capability should use the 1N5259B TR PBFREE instead.

Q: Are all three parts compatible with the same PCB footprint?

A: All three parts use through-hole axial mounting in the DO-35 package family (DO-204AH). Physical dimensions and lead spacing are compatible for direct PCB mounting. Packaging format differences (Tape & Reel versus Cut Tape) do not affect circuit board installation.

Q: What is the significance of the ±2% versus ±5% tolerance difference?

A: The ±2% tolerance of the 1N5259C-TR and BZX79-B39,113 provides tighter Zener voltage control compared to the ±5% tolerance of the 1N5259B TR PBFREE. Applications requiring precise voltage regulation benefit from the tighter tolerance. Applications with broader design margins can accommodate the ±5% tolerance without performance degradation.

Q: Do all substitutes maintain automotive qualification?

A: The main part 1N5259C-TR carries AEC-Q101 automotive qualification. The substitute parts 1N5259B TR PBFREE and BZX79-B39,113 are listed as active products with ROHS3 compliance and REACH unaffected status. Automotive qualification status for substitute parts should be verified against specific application requirements and supplier documentation.

Q: How do reverse leakage current differences affect circuit performance?

A: The main part specifies 100 nA reverse leakage at 30 V. The 1N5259B TR PBFREE maintains this specification. The BZX79-B39,113 specifies 50 nA at 27.3 V, representing lower leakage current. Lower reverse leakage improves circuit performance in high-impedance applications and reduces power consumption in standby conditions.

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

A: Interchangeability depends on circuit design specifications. The 1N5259B TR PBFREE is directly interchangeable with the main part for applications accommodating ±5% tolerance. The BZX79-B39,113 requires circuit design verification due to reduced power rating and increased impedance. Consult circuit design documentation to confirm parameter compatibility before substitution.