LM334Z

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LM334Z

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IC SENSOR TEMP ADJ CUR MODE TO92

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thuộc tính Giá trị
Package Bulk
ProductStatus Obsolete
Function Current Source
Accuracy ±3%
Voltage-Input 1V ~ 40V
Current-Output 10mA
OperatingTemperature 0°C ~ 70°C
MountingType Through Hole
Package/Case TO-226-3, TO-92-3 (TO-226AA)

Tổng quan

Description

The LM334Z is a precision current source from Texas Instruments, designed to provide a stable current output over a wide range of voltages and temperatures. It is typically used for applications requiring a constant current, such as biasing photodiodes, driving LEDs, or battery charging. The LM334Z operates as a 3-terminal adjustable current source, where the current can be set with a single resistor.
Key features of the LM334Z include its ability to operate over a wide supply voltage range (1V to 40V), a temperature coefficient that can be programmed to be zero, and a current range typically adjustable from 1 μA to 10 mA. The device is noted for its low temperature drift and high linearity, making it suitable for precision applications.
The LM334Z is available in a TO-92 package, which makes it easy to use in a variety of circuit designs. Its simplicity and reliability make it a popular choice for engineers needing a convenient current source in their projects.

Equivalent

The LM334Z is a three-terminal adjustable current source. Equivalent products include the TL431 (with external components for current regulation), Maxim's MAX6025 (for low-current applications), and the ZXCT1009 for current sensing. Each of these may require slight modifications to accommodate differences in specifications or package types. Always ensure that the chosen substitute meets the required voltage, current, and temperature specifications of your application.

Features

The LM334Z is a versatile, three-terminal adjustable current source designed for various applications requiring a constant current. Key features include:
1. Wide Operating Range: It operates over a wide range of 1 µA to 10 mA, making it suitable for diverse applications.
2. High Accuracy: The device provides high accuracy and low temperature coefficient, ensuring consistent performance.
3. Temperature Dependence: It has a built-in temperature compensating circuit, allowing it to maintain stable current over varying temperature conditions.
4. Low Voltage Operation: The LM334Z can operate with a supply voltage as low as 1V, making it efficient for low-power applications.
5. Minimal External Components: It requires only one external resistor to set the output current, simplifying the design process.
6. Compact Package: Available in a TO-92 package, it is suitable for compact and space-constrained designs.
7. Applications: Commonly used in sensor excitation, battery charging, LED driving, and precision current limiting.
These features make the LM334Z an excellent choice for applications demanding a precise and reliable current source.

Pinout

The LM334Z is a 3-pin adjustable current source IC. Here is a brief overview of its pin count and functions:
1. Pin 1 (R): This is the resistor pin. By connecting an external resistor between this pin and the V+ pin, you can set the output current. The value of the resistor determines the magnitude of the current sourced by the LM334Z.
2. Pin 2 (V+): This is the positive supply pin. It is connected to the positive side of the voltage supply. The LM334Z operates with a supply voltage of 1V to 40V.
3. Pin 3 (V-): This is the negative supply or output pin. It serves as the current output. The current flows from the V+ pin through the R pin and outputs from the V- pin based on the resistor value connected.
The LM334Z is commonly used in applications requiring a stable current, such as biasing components, sensor excitation, and battery charging circuits. It maintains a constant current regardless of supply voltage changes, making it ideal for precision current regulation tasks.

Manufacturer

The LM334Z is a precision temperature sensor and adjustable current source manufactured by Texas Instruments. Texas Instruments (TI) is a global semiconductor company that designs and produces a broad range of analog and embedded processing chips. TI is known for its innovative solutions in various sectors, including automotive, industrial, personal electronics, and communications equipment. The company is headquartered in Dallas, Texas, and has a longstanding reputation for influencing numerous technology advancements through its extensive portfolio of products.

Application

The LM334Z is a precision temperature-dependent current source that can be used in a variety of applications. Key application areas include:
1. Temperature Sensing: It can act as a temperature sensor by providing a current proportional to absolute temperature.
2. Biasing: Useful for biasing transistors in amplifier circuits due to its stable current output.
3. LED Drivers: Provides a constant current to drive LEDs, ensuring consistent brightness.
4. Battery Charging: Utilized in constant current battery charging applications.
5. Sensor Excitation: Supplies excitation current for sensors that require a stable current source.
6. Analog Signal Processing: Used in circuits that require precise current regulation for signal processing tasks.

Package

The LM334Z is a three-terminal adjustable current source in a TO-92 package. This package type is a small, plastic, through-hole, transistor-style package typically used for low-power applications.

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