1N5243 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5243 is a through-hole zener diode rated at 13 V nominal with 500 mW power dissipation in a DO-35 axial package. Manufactured by SMC Diode Solutions, this component is classified as obsolete. Due to its obsolete status and limited availability from the original manufacturer, identifying active equivalent parts is necessary to maintain design continuity and ensure supply chain reliability for new production runs and field replacements.

Substiute Parts

1N5243

SMC Diode SolutionsIn Stock: 9481N5243 Datasheet

Current PartRFQ

1N5243B TR PBFREE

Central Semiconductor CorpIn Stock: 107251N5243B TR PBFREE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N5243 is determined by matching the following critical electrical and mechanical parameters:

Electrical Parameters:

• Zener voltage: 13 V nominal
• Power dissipation: 500 mW maximum
• Impedance: 13 Ohms maximum
• Reverse leakage current: 500 nA @ 9.9 V
• Forward voltage: 1.1 V maximum @ 200 mA

Mechanical Parameters:

• Package type: DO-35 axial through-hole
• Mounting configuration: Through-hole

Compliance Parameters:

• REACH compliance status
• ECCN classification
• HTSUS code alignment

The 1N5243B TR PBFREE from Central Semiconductor Corp satisfies all electrical specifications and maintains identical mechanical compatibility. The substitute part is currently in active production status, ensuring ongoing availability and supply chain stability.

Parameter Comparison

Engineering Selection Recommendations

The 1N5243B TR PBFREE is a direct functional equivalent for the obsolete 1N5243. Selection of this substitute part is based on the following factors:

Product Status: The 1N5243B TR PBFREE is in active production status, whereas the original 1N5243 is obsolete. This ensures long-term availability and supply chain continuity.

Electrical Equivalence: All critical electrical parameters match exactly: 13 V zener voltage, 500 mW power rating, 13 Ohms impedance, and identical leakage and forward voltage characteristics.

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

Compliance Enhancements: The substitute part carries ROHS3 compliance certification and is lead-free (PBFREE designation), meeting modern environmental and regulatory requirements. Both parts maintain REACH compliance and identical ECCN and HTSUS classifications.

Voltage Tolerance: The substitute part specifies ±5% voltage tolerance, providing defined performance boundaries compared to the original part's unspecified tolerance.

For new designs and production runs, the 1N5243B TR PBFREE is the appropriate selection. For field replacements of existing 1N5243 assemblies, this substitute provides electrical and mechanical compatibility with enhanced compliance status.

Frequently Asked Questions (FAQ)

Q: Can the 1N5243B TR PBFREE be used as a direct replacement for the 1N5243?

A: Yes. Both parts share identical electrical specifications (13 V zener voltage, 500 mW power dissipation, 13 Ohms impedance) and mechanical packaging (DO-35 axial through-hole). Direct substitution is supported at the board level without circuit modifications.

Q: What is the primary reason for substituting the 1N5243?

A: The 1N5243 is classified as obsolete. The 1N5243B TR PBFREE is in active production, ensuring reliable supply availability for current and future manufacturing requirements.

Q: Are there packaging differences between these parts?

A: No. Both parts use the DO-35 axial through-hole package. Mechanical compatibility is complete, including lead spacing, body dimensions, and mounting orientation.

Q: Does the substitute part meet modern compliance standards?

A: Yes. The 1N5243B TR PBFREE is ROHS3 compliant and lead-free (PBFREE). Both parts maintain REACH compliance and identical ECCN and HTSUS classifications.

Q: What is the voltage tolerance specification for the substitute part?

A: The 1N5243B TR PBFREE specifies ±5% voltage tolerance at the 13 V nominal rating. The original 1N5243 does not specify tolerance. This defined tolerance in the substitute part provides predictable performance boundaries.

Q: Are the operating temperature ranges identical?

A: Yes. Both parts operate to a maximum temperature of 200°C. The substitute part specifies a minimum operating temperature of −65°C, providing a defined lower temperature boundary.

Q: What inventory status should be considered for procurement?

A: The 1N5243B TR PBFREE has 10,653 pieces in active stock, compared to 915 pieces of the obsolete 1N5243. The substitute part offers significantly higher availability for immediate procurement and long-term supply planning.