LM185H-1.2

Overview

The LM185H-1.2 is a micropower voltage reference diode manufactured by National Semiconductor, now part of Texas Instruments. It provides a stable reference voltage of 1.235 V with a maximum operating temperature of 70 °C and a minimum of -55 °C. The device operates with a maximum supply current of 80 µA and features a low dynamic impedance of 0.06 Ω. It is housed in a TO-92 plastic package with three pins.

Feature Summary

• Micropower operation suitable for battery-powered applications
• Low dynamic impedance for high stability
• Two-terminal zener-like configuration

Applications

• Battery-powered instrumentation
• Portable measurement devices
• Voltage reference sources

Procurement Notes

Verify the manufacturer origin as National Semiconductor or Texas Instruments. Confirm the package type is TO-92 and the output voltage is 1.235 V. Check for RoHS compliance status if required by your project specifications. Ensure the operating temperature range meets your environmental requirements.

Selection Notes

Select this component when a low-cost, low-power voltage reference is needed. It is suitable for applications requiring a stable 1.235 V reference with minimal current draw. Consider the TO-92 package for through-hole mounting needs. Compare dynamic impedance and temperature coefficients against other references if higher precision is required.

Part Context

The LM185 series belongs to the family of micropower voltage reference diodes. These devices are designed to provide a stable reference voltage in a compact package. They are commonly used in analog circuits where a precise voltage level is necessary for regulation or measurement purposes.

Replacement Considerations

The LM285H-1.2 and LM385H-1.2 are electrically similar parts within the same family. Verify pinout compatibility and temperature range differences before substitution. Other manufacturers offer equivalent 1.235 V references such as the TL431 in different configurations.