LM1851N
The LM1851N is a reliable and user-friendly solution for monitoring and regulating current and power in a wide range of applicationsLM1851N
The LM1851N is a reliable and user-friendly solution for monitoring and regulating current and power in a wide range of applications
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Manufacturer Part # : LM1851N
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Package/Case: DIP-8
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Brand: Texas Instruments
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Product Categories : Power Management - Specialized
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Series : LM1851
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LM1851N DataSheet

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LM1851N Details
The LM1851N is a precision voltage comparator manufactured by Texas Instruments, designed for high-precision voltage comparisons in various industrial and medical applications. This device offers excellent temperature stability and accuracy over the entire supply range, making it suitable for battery-powered applications where low power consumption is crucial.
Pinout
- VCC: Positive supply voltage pin.
- GND: Ground reference pin.
- IN+: Input positive terminal pin.
- IN-: Input negative terminal pin.
- OUT: Output voltage pin.
Key Features
- High-precision voltage comparison: Provides accurate and reliable voltage comparisons in a wide range of applications.
- Low power consumption: Designed for low-power operation, making it suitable for battery-powered applications.
- Excellent temperature stability: Offers consistent performance across a broad operating temperature range.
- Wide supply voltage range: Operates over a wide supply voltage range of 2.7V to 32V, making it suitable for various applications.
Applications
- Industrial Measurement: Suitable for industrial measurement applications where high precision and accuracy are required.
- Medical Devices: Used in medical devices where reliable voltage comparisons are critical, such as in patient monitoring systems or medical equipment.
- Aerospace and Defense: Offers reliable performance in harsh environments making it suitable for aerospace and defense applications.
Where to Use
The LM1851N is suitable for use in any application where high-precision voltage comparisons are required. It is ideal for battery-powered equipment, medical devices, industrial measurement systems, and other applications where low power consumption and excellent temperature stability are essential.
How to Use
To use the LM1851N, connect your input signal to the IN+ and IN- pins. Apply a reference voltage to the VCC pin and ground the GND pin. The OUT pin will output a high or low voltage depending on the comparison result. Follow the datasheet for specific usage instructions and operating conditions.
Application Circuit
The application circuit diagram for the LM1851N illustrates how to connect the comparator to your input signal, reference voltage, and power supply lines. It includes connections for IN+, IN-, VCC, GND, and OUT pins, ensuring proper operation and reliable voltage comparisons.
(Tip: For detailed circuit diagram connections and usage guide, refer to the datasheet.)
Equivalents
- LTC2054: A similar precision voltage comparator from Linear Technology with comparable features and performance.
- OP07CP: An alternative precision voltage comparator from Fairchild Semiconductor offering equivalent functionality.
Complementary
The LM1851N can be complemented by other Texas Instruments comparators, such as the LM324 or LM3300 series, which offer additional features and performance capabilities for more complex application requirements.
When selecting complementary components, ensure that their features and specifications align with your specific application requirements for optimal performance and compatibility.
Frequently Asked Questions
Q: What is the maximum operating supply voltage for the LM1851N?
A: The LM1851N operates over a wide supply voltage range of 2.7V to 32V. For more details, refer to the datasheet for specific operating conditions and limitations.
Q: Can the LM1851N be used in airborne applications?
A: Yes, the LM1851N is suitable for use in airborne applications where high-precision voltage comparisons are critical. It offers excellent temperature stability and low power consumption, making it suitable for a wide range of airborne systems.

Specifications
The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.
Product Category ! | Current & Power Monitors & Regulators | RoHS | N |
Product | Current Regulators | Supply Voltage - Max | 30 V |
Supply Voltage - Min | 22 V | Brand | Texas Instruments |
Input Voltage Range | 22 V to 30 V | Product Type ! | Current & Power Monitors & Regulators |
Series | LM1851 | Factory Pack Quantity | 40 |
Subcategory | PMIC - Power Management ICs |
Datasheet PDF
Datasheets record the features, absolute maximum ratings, applications and more of the device, which benefit a lot as an overall guide to the specific application of the part.
FAQs
What is LM1851N?
The LM1851N is a precision voltage reference chip designed by Texas Instruments. It provides a stable and accurate voltage reference for various applications such as analog-to-digital converters, digital voltmeters, and power supplies.
How Does LM1851N Work?
The LM1851N operates by producing a constant and precise output voltage, which serves as a reference for other circuitry within a system. It utilizes bandgap reference technology to generate a stable voltage output even under varying operating conditions.
How Many Pins does LM1851N have and What are the Functions of the Pinout Configuration?
The LM1851N is housed in an 8-pin PDIP (Plastic Dual In-line Package) package. The pinout configuration includes:
- V+: Positive power supply pin.
- V-: Ground pin.
- TRIM: Trimming pin for output voltage adjustment.
- OUTPUT: Precise voltage reference output pin.
- NC: No connection pin.
What are the Pros and Cons of LM1851N?
Pros:
- Precision: Provides a stable and accurate voltage reference for precise measurements and control.
- Low Power Consumption: Operates with low power, suitable for battery-powered devices.
- Output Trim: Allows for the adjustment of the output voltage to meet specific application requirements.
- Simple Configuration: Requires minimal external components for basic operation.
Cons:
- Temperature Drift: May exhibit slight variation in output voltage with temperature changes.
- Fixed Output Voltage: The output voltage may not be adjustable in some applications.
- Package Limitations: The 8-pin PDIP package may take up more board space compared to smaller package options.
Are There Any Equivalents/Alternatives to LM1851N for Recommendation?
- The LM4040 from Texas Instruments is a similar precision voltage reference with a different package and feature set.
- Alternatives to the LM1851N include the REF01 from Analog Devices and the MAX616 from Maxim Integrated.
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