LM334Z/NOPB

Product Overview

• Category: Integrated Circuit
• Use: Current Source/Sink
• Characteristics: Adjustable, Precision, Temperature Compensated
• Package: TO-92 (3-Lead)
• Essence: The LM334Z/NOPB is a versatile current source/sink integrated circuit that provides a precise and temperature-compensated output current. It is commonly used in various applications requiring stable and adjustable current sources or sinks.
• Packaging/Quantity: Available in tape and reel packaging with 2,500 units per reel.

Specifications

• Operating Voltage Range: 1V to 40V
• Output Current Range: 1µA to 10mA
• Temperature Coefficient: 0.33%/°C
• Operating Temperature Range: -40°C to +125°C
• Line Regulation: 0.01%/V
• Load Regulation: 0.1%/mA

Detailed Pin Configuration

The LM334Z/NOPB has three leads in a TO-92 package:

1. Pin 1 (Anode): Connected to the positive terminal of the power supply.
2. Pin 2 (Cathode): Connected to the load or reference voltage point.
3. Pin 3 (Adjust): Used to adjust the output current by connecting a resistor between this pin and the cathode.

Functional Features

• Precise and stable output current over a wide range of operating conditions.
• Temperature compensation ensures consistent performance across varying temperatures.
• Adjustable output current allows for flexibility in different applications.
• Low voltage drop minimizes power dissipation.
• Simple and easy-to-use design.

Advantages

• High precision and accuracy in generating constant currents.
• Wide operating voltage range enables compatibility with various power supplies.
• Temperature compensation ensures reliable performance in different temperature environments.
• Adjustable output current provides versatility for different application requirements.
• Low power dissipation helps to minimize energy consumption.

Disadvantages

• Limited maximum output current of 10mA may not be suitable for high-power applications.
• TO-92 package may not be ideal for space-constrained designs.
• Requires an external resistor for adjusting the output current, adding complexity to the circuit design.

Working Principles

The LM334Z/NOPB operates based on the principle of a two-terminal current source/sink. It utilizes an internal bandgap voltage reference and a feedback loop to maintain a constant current through the load or reference point. The output current is adjustable by connecting an external resistor between the adjust pin and the cathode.

Detailed Application Field Plans

The LM334Z/NOPB finds applications in various fields, including:

1. Precision Instrumentation: Used as a stable current source for calibration and testing equipment.
2. Battery Charging: Provides precise current control during battery charging processes.
3. LED Driver Circuits: Ensures consistent current supply for driving LEDs.
4. Temperature Sensors: Utilized as a current source for temperature sensing circuits.
5. Analog Circuit Design: Enables the creation of precision analog circuits requiring accurate current sources or sinks.

Detailed and Complete Alternative Models

1. LM134/LM234/LM334: Similar current source/sink ICs with different package options (TO-46, SOIC, SOT-23).
2. LT3092: Precision current source/sink with higher output current capability (up to 200mA).
3. AD8276: Programmable current source/sink with digital control interface.

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