Specifications
| Attribute | Value |
| Package | Tape & Reel (TR) |
| ProductStatus | Obsolete |
| Function | Current Source |
| Accuracy | ±6% |
| Voltage-Input | 1V ~ 40V |
| Current-Output | Adjustable |
| OperatingTemperature | 0°C ~ 70°C |
| MountingType | Surface Mount |
| Package/Case | 8-SOIC (0.154, 3.90mm Width) |
Overview
Description
The LM334MX is a precision current source integrated circuit (IC) designed to provide a constant current output over a wide range of input voltages. It is part of the LM334 series from Texas Instruments, commonly used in applications requiring stable and adjustable current sources, such as sensor biasing and LED drivers. The device operates over a voltage range of 1V to 40V and can supply currents from 1µA to 10mA, adjustable via an external resistor.
Key features include temperature stability, with minimal drift over the operating range, and low quiescent current, making it energy-efficient. The LM334MX is packaged in a compact surface-mount format, typically the SOIC-8, which is suitable for space-constrained applications. It also features a simple design requiring only a few external components, facilitating easy integration into various circuits. Because of its versatility and reliability, the LM334MX is a popular choice in both commercial and industrial electronic designs.
Key features include temperature stability, with minimal drift over the operating range, and low quiescent current, making it energy-efficient. The LM334MX is packaged in a compact surface-mount format, typically the SOIC-8, which is suitable for space-constrained applications. It also features a simple design requiring only a few external components, facilitating easy integration into various circuits. Because of its versatility and reliability, the LM334MX is a popular choice in both commercial and industrial electronic designs.
Equivalent
The LM334MX is a precision current source IC. Equivalent products include:
1. LT3092 - An adjustable 2-terminal current source.
2. LM334Z/NOPB - Similar current source from the LM334 family with different packaging.
3. MAX6025 - Offers precision current capabilities.
4. TL431 - Used in some applications for voltage and current regulation.
5. ZXCT1009 - A high-side current monitor with similar applications.
Ensure compatibility in parameters such as current range, voltage, and package type when selecting a replacement.
1. LT3092 - An adjustable 2-terminal current source.
2. LM334Z/NOPB - Similar current source from the LM334 family with different packaging.
3. MAX6025 - Offers precision current capabilities.
4. TL431 - Used in some applications for voltage and current regulation.
5. ZXCT1009 - A high-side current monitor with similar applications.
Ensure compatibility in parameters such as current range, voltage, and package type when selecting a replacement.
Features
The LM334MX is a precision temperature-dependent current source designed for applications requiring precise current regulation. It offers the following features:
1. Temperature Dependence: The output current is directly proportional to absolute temperature (PTAT), making it suitable for temperature sensing and compensation.
2. Adjustable Current: The output current can be set from 1µA to 10mA using a single external resistor.
3. Wide Voltage Range: It operates over a wide voltage range, typically from 1V to 40V.
4. Low Temperature Coefficient: The device ensures minimal variations in current with changes in temperature.
5. Minimal External Components: Requires only a resistor for setting the current, simplifying the circuit design.
6. Package: The "MX" suffix indicates that the device is available in a surface-mount SOIC-8 package.
7. Applications: Commonly used in biasing, temperature compensation circuits, and as a precision current source.
The LM334MX is ideal for applications needing stable and precise current regulation over varying temperatures, with minimal component count.
1. Temperature Dependence: The output current is directly proportional to absolute temperature (PTAT), making it suitable for temperature sensing and compensation.
2. Adjustable Current: The output current can be set from 1µA to 10mA using a single external resistor.
3. Wide Voltage Range: It operates over a wide voltage range, typically from 1V to 40V.
4. Low Temperature Coefficient: The device ensures minimal variations in current with changes in temperature.
5. Minimal External Components: Requires only a resistor for setting the current, simplifying the circuit design.
6. Package: The "MX" suffix indicates that the device is available in a surface-mount SOIC-8 package.
7. Applications: Commonly used in biasing, temperature compensation circuits, and as a precision current source.
The LM334MX is ideal for applications needing stable and precise current regulation over varying temperatures, with minimal component count.
Pinout
The LM334MX is a three-terminal adjustable current source. It is primarily used to generate a constant current over a wide temperature range. The device is available in a surface-mount package, typically a SOT-23-3 package, which means it has three pins.
1. Pin 1 (R): This pin is connected to an external resistor (Rset) that sets the desired current flowing through the device. The value of Rset determines the output current based on the formula: \( I = \frac{67.7 \, \text{mV}}{Rset} \).
2. Pin 2 (V+ or VIN): This is the positive supply voltage input. It should be connected to the higher potential side of the voltage from which the current is sourced.
3. Pin 3 (V- or IOUT): This is the output pin where the constant current is provided. It is connected to the load, allowing the current to flow from the positive supply through the load.
The LM334MX can be used in various applications such as temperature sensing, current limiting, and as a precision current reference.
1. Pin 1 (R): This pin is connected to an external resistor (Rset) that sets the desired current flowing through the device. The value of Rset determines the output current based on the formula: \( I = \frac{67.7 \, \text{mV}}{Rset} \).
2. Pin 2 (V+ or VIN): This is the positive supply voltage input. It should be connected to the higher potential side of the voltage from which the current is sourced.
3. Pin 3 (V- or IOUT): This is the output pin where the constant current is provided. It is connected to the load, allowing the current to flow from the positive supply through the load.
The LM334MX can be used in various applications such as temperature sensing, current limiting, and as a precision current reference.
Manufacturer
The LM334MX is a precision temperature sensor and current source IC originally manufactured by National Semiconductor. National Semiconductor was a company that specialized in the design and manufacture of analog and mixed-signal integrated circuits. In 2011, National Semiconductor was acquired by Texas Instruments (TI), a major American technology company known for its development and manufacturing of semiconductors and various integrated circuit products. Texas Instruments now continues to support and produce the LM334MX under its own brand. TI is recognized for its broad portfolio of analog products, digital signal processors, and embedded processors, serving a wide range of industries including automotive, industrial, personal electronics, communications equipment, and enterprise systems.
Application
The LM334MX is a precision, temperature-dependent current source used in various applications. Key areas include:
1. Temperature Sensing: Utilized in thermally sensitive circuits due to its temperature-dependent current characteristics.
2. Current Regulation: Acts as a constant current source for biasing and driving LEDs, laser diodes, and other components requiring stable current.
3. Analog Signal Processing: Used in precision analog circuits for offsetting voltage references and amplifiers.
4. Battery Management: Employed in battery charging circuits to control charging currents.
5. Medical Devices: Integrated into circuits that require precise current control for accurate measurements and operations.
Its versatility in providing stable, adjustable current makes it valuable in these and other precision electronic applications.
1. Temperature Sensing: Utilized in thermally sensitive circuits due to its temperature-dependent current characteristics.
2. Current Regulation: Acts as a constant current source for biasing and driving LEDs, laser diodes, and other components requiring stable current.
3. Analog Signal Processing: Used in precision analog circuits for offsetting voltage references and amplifiers.
4. Battery Management: Employed in battery charging circuits to control charging currents.
5. Medical Devices: Integrated into circuits that require precise current control for accurate measurements and operations.
Its versatility in providing stable, adjustable current makes it valuable in these and other precision electronic applications.
Package
The LM334MX is packaged in a surface-mount small outline transistor (SOT-23) package. This package type is compact and suitable for applications requiring space-efficient designs.
