1N5245 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5245 is a through-hole zener diode rated at 15 V nominal voltage with 500 mW maximum power dissipation in a DO-35 axial package. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. Substitute parts must maintain electrical performance across voltage regulation, power handling, and thermal characteristics while meeting current manufacturing and compliance standards.

Substiute Parts

1N5245

SMC Diode SolutionsIn Stock: 55331N5245 Datasheet

Current PartRFQ

1N5245B TR PBFREE

Central Semiconductor CorpIn Stock: 198371N5245B TR PBFREE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N5245 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Zener voltage: 15 V nominal
• Maximum power dissipation: 500 mW
• Package type: DO-35 axial through-hole
• Impedance (Max): 16 Ohms
• Reverse leakage current: 100 nA @ 11 V
• Forward voltage: 1.1 V @ 200 mA

Acceptable Variations:

• Voltage tolerance: Substitute may include specified tolerance (±5%) where original lacks tolerance specification
• Operating temperature range: Substitute may provide extended range
• Product status: Active substitutes are preferred over obsolete originals
• Compliance certifications: Substitute may include additional certifications (RoHS3, PBFREE designation)

The 1N5245B TR PBFREE qualifies as a direct substitute based on identical electrical specifications, matching package configuration, and maintained thermal characteristics across the specified operating range.

Parameter Comparison

Engineering Selection Recommendations

The 1N5245B TR PBFREE from Central Semiconductor Corp is a direct functional equivalent to the obsolete 1N5245. Selection of this substitute is based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match the original specification exactly: 15 V zener voltage, 500 mW power rating, 16 Ohms maximum impedance, 100 nA reverse leakage, and 1.1 V forward voltage. These parameters ensure identical circuit performance in voltage regulation and protection applications.

Mechanical Compatibility: Both parts utilize the DO-35 axial through-hole package, enabling direct PCB footprint compatibility without layout modifications.

Product Status: The substitute is classified as active, ensuring long-term availability and manufacturing continuity compared to the obsolete original.

Compliance Status: The substitute carries ROHS3 compliance and PBFREE designation, meeting current environmental and manufacturing standards. Both parts maintain REACH Unaffected status and EAR99 export classification.

Operating Range: The substitute provides an extended operating temperature range (-65°C to 200°C) compared to the original specification, offering broader thermal application flexibility.

Frequently Asked Questions (FAQ)

Q: Can the 1N5245B TR PBFREE be used as a direct replacement for the 1N5245 in existing designs?

A: Yes. The 1N5245B TR PBFREE maintains identical electrical specifications across all critical parameters: zener voltage, power dissipation, impedance, leakage current, and forward voltage. The DO-35 axial package is mechanically identical, allowing direct PCB substitution without circuit modification.

Q: What is the significance of the ±5% voltage tolerance on the substitute part?

A: The 1N5245B TR PBFREE specifies ±5% tolerance on the 15 V zener voltage, meaning the actual voltage will fall between 14.25 V and 15.75 V. The original 1N5245 does not specify tolerance. In applications requiring tighter voltage control, this tolerance specification should be evaluated against circuit requirements.

Q: Does the extended operating temperature range of the substitute affect circuit performance?

A: The substitute's operating range of -65°C to 200°C encompasses the original specification. Extended low-temperature capability does not affect performance in applications limited to the original range. Applications requiring operation below room temperature benefit from the extended range.

Q: Are there any compliance differences between the original and substitute parts?

A: The substitute carries ROHS3 compliance and PBFREE designation, indicating lead-free construction and compliance with current environmental regulations. The original part does not specify these certifications. Both parts maintain REACH Unaffected status and EAR99 export classification.

Q: What is the packaging difference between the original and substitute?

A: The original is supplied in standard packaging. The substitute is supplied in Cut Tape (CT) packaging, which is a standard reel format for automated assembly. Both use the identical DO-35 axial component form factor. Packaging format does not affect electrical or mechanical performance.

Q: Are there inventory considerations when selecting the substitute?

A: The substitute (1N5245B TR PBFREE) has significantly higher inventory availability (19,774 pcs) compared to the original (5,475 pcs), supporting procurement reliability and lead-time reduction.