1N5240B

Single Zener Diodes Overview

The Microchip Technology 1N5240B is a single silicon unidirectional Zener voltage regulator diode housed in a hermetically sealed glass axial-lead DO-35 (DO-204AH) package. It provides a nominal Zener voltage of 10 V with a standard tolerance of ±5% for the B suffix variant. The device dissipates up to 0.5 W at 25°C and operates within a temperature range of -65°C to +175°C. Key electrical parameters include a maximum reverse leakage current of 3 µA at 8 V, a Zener impedance of 17 Ohms at a test current of 20 mA, and a positive voltage temperature coefficient of +0.075 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction
• Inherently radiation hard per MicroNote 050
• Minimal capacitance characteristics
• ESD nonsensitive per MIL-STD-750 Method 1020

Single Zener Diodes Applications

• Voltage regulation over broad operating currents
• Reference voltage generation
• Protection circuits requiring radiation hardness

Single Zener Diodes Procurement Notes

Verify the specific ordering suffix against the manufacturer's documentation to confirm compliance requirements. The base part number denotes the JEDEC registered type; additional suffixes such as 'e3' indicate RoHS compliance, while prefixes like 'MX' denote military screening levels. Ensure the required tolerance matches the suffix designation, as the 'B' suffix specifies a 5% voltage tolerance distinct from other variants.

Single Zener Diodes Selection Notes

Select this component when a robust, hermetically sealed axial-lead Zener diode is required for high-reliability applications. The DO-35 package offers flexible mounting terminals suitable for through-hole assembly. Consider the positive temperature coefficient at 10 V when designing circuits sensitive to thermal drift, and verify that the 0.5 W power dissipation rating aligns with the thermal management capabilities of the target PCB layout.

Single Zener Diodes Part Context

This device belongs to the 1N5221 through 1N5281B series of 0.5-watt Zener Voltage Regulators. The series covers a wide selection of voltages from 2.4 to 200 volts. These components are widely recognized for their reliability in standard industrial and commercial environments, offering both standard and tighter voltage tolerances depending on the suffix letter assigned to the part number.

Single Zener Diodes Replacement Considerations

Direct replacements include the CDLL5240 for surface mount applications or the MLL5240B in the DO-213AA MELF style package. For equivalent through-hole performance, verify compatibility with other manufacturers' 1N5240B equivalents ensuring the same DO-35 package and 500 mW power rating.