LM185BH

The National Semiconductor LM185BH is a precision voltage reference designed for use in a variety of electronic applications. This device is particularly valued for its stability, accuracy, and low noise characteristics, making it suitable for use in instrumentation, data acquisition systems, and other applications where a stable reference voltage is critical. Below is a detailed overview of the specifications, features, and applications of the LM185BH.

### Overview

- Type: Precision Voltage Reference
- Manufacturer: National Semiconductor (now part of Texas Instruments)
- Model: LM185BH
- Output Voltage: 1.225 V (nominal)
- Package Type: TO-100 (metal can) or other configurations

### Key Specifications

1. Output Voltage:
- The LM185BH provides a nominal output voltage of 1.225 V. This voltage is highly stable and accurate, making it an ideal reference for various applications.

2. Temperature Coefficient:
- The temperature coefficient of the LM185BH is typically 30 ppm/°C (parts per million per degree Celsius). This low temperature coefficient ensures that the output voltage remains stable over a wide temperature range, which is crucial for precision applications.

3. Output Impedance:
- The output impedance of the LM185BH is low, typically around 0.1 ohms. This low output impedance allows the device to maintain a stable output voltage even when the load conditions change.

4. Load Regulation:
- The load regulation specification indicates how much the output voltage changes with variations in load current. The LM185BH typically exhibits excellent load regulation, ensuring minimal voltage variation with changes in load.

5. Line Regulation:
- The line regulation of the LM185BH is also very good, typically around 0.1 mV/V. This means that variations in the input voltage have a minimal effect on the output voltage, further enhancing the stability of the reference.

6. Noise:
- The LM185BH features low noise characteristics, with a typical noise voltage of about 0.1 mV (rms) over a bandwidth of 0.1 Hz to 10 Hz. This low noise performance is essential for applications requiring high precision.

7. Power Supply Voltage:
- The LM185BH operates with a supply voltage range of 2.5 V to 40 V, providing flexibility in various circuit designs. The device can function effectively across this wide range of supply voltages.

8. Temperature Range:
- The operating temperature range for the LM185BH is typically from -40°C to +85°C, making it suitable