1N5249 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5249 is a through-hole zener diode rated at 19 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 1N5249 series remains functionally relevant for legacy circuit maintenance and new designs requiring 19 V zener regulation in compact through-hole form factors.

Substiute Parts

1N5249

SMC Diode SolutionsIn Stock: 8521N5249 Datasheet

Current PartRFQ

1N5249B TR PBFREE

Central Semiconductor CorpIn Stock: 8191N5249B TR PBFREE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N5249 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Zener voltage: 19 V nominal
• Maximum power dissipation: 500 mW
• Package type: DO-35 through-hole axial configuration
• Impedance (maximum): 23 Ohms
• Reverse leakage current: 100 nA @ 14 V
• Forward voltage: 1.1 V @ 200 mA

The 1N5249B TR PBFREE manufactured by Central Semiconductor Corp meets all electrical specifications of the original 1N5249. This substitute maintains identical zener voltage, power rating, impedance, and thermal characteristics. The primary distinction is product status: the 1N5249B TR PBFREE is active and carries RoHS3 compliance certification, whereas the original 1N5249 is obsolete. The substitute is supplied in Tape & Reel packaging with ±5% voltage tolerance specification.

Parameter Comparison

Engineering Selection Recommendations

The 1N5249B TR PBFREE is the direct functional equivalent for the obsolete 1N5249. Selection of this substitute is based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match exactly, including zener voltage, power dissipation, impedance, leakage current, and forward voltage characteristics. The ±5% voltage tolerance specification of the substitute provides defined performance boundaries suitable for precision voltage regulation applications.

Product Status: The 1N5249B TR PBFREE maintains active product status with established supply chain availability, whereas the original 1N5249 is obsolete. This transition ensures long-term component procurement reliability.

Regulatory Compliance: The substitute carries RoHS3 compliance certification, meeting current environmental and material restriction requirements. Both parts maintain REACH Unaffected status and identical ECCN and HTSUS classifications.

Packaging Compatibility: The substitute is supplied in Tape & Reel format, which is standard for automated assembly processes. The physical DO-35 axial package remains unchanged, ensuring direct mechanical compatibility with existing PCB layouts and through-hole mounting procedures.

Frequently Asked Questions (FAQ)

Q: Can the 1N5249B TR PBFREE be used as a direct replacement for the 1N5249 in existing designs?

A: Yes. The 1N5249B TR PBFREE is electrically and mechanically equivalent to the 1N5249. All critical parameters—zener voltage, power rating, impedance, leakage current, and forward voltage—are identical. The physical DO-35 package dimensions and through-hole mounting configuration are unchanged.

Q: What is the significance of the "TR PBFREE" designation in the substitute part number?

A: "TR" indicates Tape & Reel packaging format, which is the standard supply method for high-volume production. "PBFREE" indicates lead-free construction, compliant with RoHS3 environmental standards. These designations reflect modern manufacturing and compliance practices.

Q: Does the ±5% voltage tolerance of the 1N5249B TR PBFREE affect circuit performance compared to the original 1N5249?

A: The ±5% tolerance specification of the substitute defines the acceptable voltage variation range. This tolerance is typical for zener diodes in this voltage class and is suitable for standard voltage regulation applications. Circuit designs should account for this tolerance range in their specifications.

Q: Are there any differences in thermal performance between the 1N5249 and 1N5249B TR PBFREE?

A: No. Both parts share identical maximum operating temperature ratings of 200°C and identical power dissipation limits of 500 mW. Thermal performance is equivalent.

Q: What is the difference between the 1N5249 and 1N5249B TR PBFREE in terms of supply availability?

A: The 1N5249 is classified as obsolete and has limited availability. The 1N5249B TR PBFREE is an active product with established supply chain support. For new designs and ongoing procurement, the active substitute is the appropriate selection.

Q: Can the 1N5249B TR PBFREE be used in both manual and automated assembly processes?

A: Yes. The Tape & Reel packaging format is designed for automated pick-and-place assembly. The component can also be manually installed in through-hole applications using standard soldering techniques.

Q: Are the REACH and ECCN classifications identical between the two parts?

A: Yes. Both the 1N5249 and 1N5249B TR PBFREE maintain identical REACH Unaffected status, ECCN classification (EAR99), and HTSUS code (8541.10.0050).