1N4740CP/TR12

Overview

The Microchip Technology 1N4740CP/TR12 is a silicon 1-watt Zener diode in the 1N4728A-1N4764A series, housed in a plastic DO-41 (DO-204AL) package. It features a nominal Zener voltage of 10V with a ±5% tolerance (indicated by the 'A' suffix). The device operates at a test current of 25mA and exhibits a maximum dynamic impedance of 7 ohms at this current. Maximum reverse leakage current is specified at 10µA under a test voltage of 10V. The component supports a steady-state power dissipation of 1.0 watt at lead temperatures below 105°C or ambient temperatures below 45°C when mounted on FR4 PCBs. It includes a tape and reel option for automated assembly.

Feature Summary

• Provides voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for standard through-hole applications
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Applications

• Voltage regulation in power supply circuits
• Overvoltage protection for sensitive electronic components
• Reference voltage generation in analog signal processing

Procurement Notes

Verify that the part number matches the specific electrical characteristics required, particularly the 10V Zener voltage and 1W power rating. Confirm the presence of the 'TR' suffix indicates tape and reel packaging if automated placement is intended. Ensure the 'P' suffix denotes the plastic DO-41 package variant rather than the glass-body option. Check for RoHS compliance indicators such as the 'e3' suffix if environmental regulations apply to the manufacturing process.

Selection Notes

Select this component when a 10V reference with moderate precision is needed in a high-power dissipation environment. The plastic DO-41 package offers lower thermal resistance compared to glass-body equivalents, making it suitable for applications requiring efficient heat transfer. Consider the 5% voltage tolerance for general regulation tasks where tighter tolerances are not critical. Ensure the circuit design accounts for the derating curves provided in the datasheet to maintain reliability under varying thermal conditions.

Part Context

This device belongs to the widely used 1N47xx series of Zener diodes, which are JEDEC registered. The series spans from 3.3V to 100V, offering extensive voltage selection for various regulatory needs. The 1N4740A variant specifically targets the 10V market segment. The 'C' suffix typically denotes a tighter tolerance, but the source document specifies 'A' for 5% and 'C' for 2%; however, the model provided is 1N4740CP, implying a plastic package with potentially specific tolerance or screening, though the base datasheet defines 'A' as 5%. The 'TR12' likely refers to a specific tape and reel quantity or configuration.

Replacement Considerations

Surface mount equivalents such as SMAJ4740A or MLL4740A are available from the same manufacturer family. For glass-body replacements, consult the separate datasheet for G-suffix options. Military screening levels can be achieved by adding prefixes like MQ, MX, MV, or MSP to the base part number.