LM334Z

Product Overview

Category: Integrated Circuit (IC)

Use: The LM334Z is a precision three-terminal adjustable current source. It is designed to provide a constant current over a wide range of operating voltages.

Characteristics: - Adjustable current source - Wide operating voltage range - Precision performance

Package: TO-92 package

Essence: The LM334Z is an essential component in electronic circuits that require a constant and precise current source.

Packaging/Quantity: The LM334Z is typically sold in packs of 10 or 100 units.

Specifications

The LM334Z has the following specifications:

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

Pin Configuration

The LM334Z has three pins:

1. Pin 1: Adjust - Used to set the desired output current.
2. Pin 2: Cathode - Connected to the load or circuit requiring a constant current.
3. Pin 3: Anode - Connected to the positive supply voltage.

Functional Features

The LM334Z offers the following functional features:

• Adjustable Output Current: The output current can be easily adjusted using the adjust pin.
• Constant Current Source: It provides a stable and precise current regardless of changes in the input voltage or load resistance.
• Temperature Stability: The LM334Z maintains its current output stability over a wide temperature range.

Advantages and Disadvantages

Advantages: - Precise and stable current source - Wide operating voltage range - Easy to adjust output current

Disadvantages: - Limited current range (up to 10mA) - Requires an external resistor for current adjustment

Working Principles

The LM334Z operates based on the principle of a two-transistor current source. It uses a reference voltage and a feedback mechanism to maintain a constant current output. By adjusting the voltage at the adjust pin, the desired current can be set.

Detailed Application Field Plans

The LM334Z finds applications in various fields, including:

1. LED Lighting: It can be used to drive LEDs with a constant current, ensuring consistent brightness and longevity.
2. Battery Charging: The LM334Z can be employed in battery charging circuits to provide a controlled charging current.
3. Sensor Biasing: It is suitable for biasing sensors that require a stable and precise current source.
4. Test and Measurement Equipment: The LM334Z can be utilized in test and measurement instruments that require accurate current sources.

Detailed and Complete Alternative Models

Some alternative models to the LM334Z include:

1. LM317: A versatile adjustable voltage regulator that can also be used as a current source.
2. LT3092: A precision current source with a wide input voltage range and low dropout voltage.
3. AD8276: A programmable current source with high accuracy and flexibility.

These alternative models offer similar functionality and can be considered depending on specific requirements.

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