1N5261 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5261 is a through-hole zener diode rated at 47 V nominal voltage with 500 mW maximum power dissipation in a DO-35 axial package. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement. The 1N5261 functions as a voltage regulation and transient protection element in electronic circuits requiring stable 47 V reference voltage.

Substiute Parts

1N5261

SMC Diode SolutionsIn Stock: 11431N5261 Datasheet

Current PartRFQ

1N5261B TR PBFREE

Central Semiconductor CorpIn Stock: 11621N5261B TR PBFREE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N5261 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Zener voltage: 47 V nominal
• Maximum power dissipation: 500 mW
• Package type: DO-35 axial through-hole
• Impedance (maximum): 105 Ohms
• Reverse leakage current: 100 nA @ 36 V
• Forward voltage: 1.1 V @ 200 mA

The 1N5261B TR PBFREE manufactured by Central Semiconductor Corp meets all electrical specifications of the original 1N5261. This substitute is available in active product status with RoHS3 compliance and operates across an extended temperature range of -65°C to 200°C, compared to the original part's maximum operating temperature specification of 200°C.

Parameter Comparison

Engineering Selection Recommendations

The 1N5261B TR PBFREE is a direct electrical and mechanical substitute for the obsolete 1N5261. Selection of this substitute is based on the following factors:

Product Status: The 1N5261B TR PBFREE maintains active manufacturing status, ensuring long-term availability and supply chain continuity compared to the obsolete 1N5261.

Electrical Equivalence: All critical electrical parameters match exactly: 47 V zener voltage, 500 mW power rating, 105 Ohms maximum impedance, 100 nA reverse leakage, and 1.1 V forward voltage. The substitute includes a specified tolerance of ±5%, providing additional design clarity.

Compliance and Certifications: The 1N5261B TR PBFREE is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement. Both parts share identical ECCN (EAR99) and HTSUS (8541.10.0050) classifications.

Mechanical Compatibility: Both parts use identical DO-35 axial through-hole packaging, ensuring direct board-level substitution without layout modifications.

Temperature Performance: The substitute operates across -65°C to 200°C, providing enhanced low-temperature performance while maintaining the original part's maximum operating temperature.

Frequently Asked Questions (FAQ)

Q: Can the 1N5261B TR PBFREE be used as a direct replacement for the 1N5261 in existing designs?

A: Yes. The 1N5261B TR PBFREE is electrically and mechanically equivalent to the 1N5261 across all specified parameters. The DO-35 axial package dimensions are identical, allowing direct board-level substitution without circuit modifications.

Q: What is the difference between the 1N5261 and 1N5261B TR PBFREE?

A: The primary differences are product status and packaging format. The 1N5261 is obsolete and supplied in bulk packaging, while the 1N5261B TR PBFREE is an active product supplied in Tape & Reel format. The 1N5261B TR PBFREE includes a specified zener voltage tolerance of ±5% and is ROHS3 compliant.

Q: Does the Tape & Reel packaging of the 1N5261B TR PBFREE affect its performance?

A: No. Tape & Reel packaging is a supply format used for automated assembly processes. The component itself is identical to bulk-packaged versions. The electrical and mechanical specifications remain unchanged.

Q: Are there any temperature range differences between the 1N5261 and 1N5261B TR PBFREE?

A: The 1N5261B TR PBFREE operates from -65°C to 200°C, while the 1N5261 specification indicates a maximum operating temperature of 200°C. The substitute provides extended low-temperature capability.

Q: What compliance certifications apply to the 1N5261B TR PBFREE?

A: The 1N5261B TR PBFREE is ROHS3 compliant and REACH unaffected. Both parts share the same ECCN classification (EAR99) and HTSUS code (8541.10.0050).

Q: Can the 1N5261B TR PBFREE be used in high-reliability applications?

A: The 1N5261B TR PBFREE meets all electrical and mechanical specifications required for the original 1N5261 application. Component selection for high-reliability applications must be based on specific system requirements, qualification standards, and procurement specifications beyond the scope of this equivalence reference.