Overview
The LM234DT, produced by STMicroelectronics, is a 3-terminal adjustable current source. This component is part of the LM134/LM234/LM334 family, known for their high current regulation and wide dynamic voltage range. The LM234DT operates from 1V to 40V and can be programmed to deliver currents from 1µA to 10mA. It features excellent temperature stability and can be used in a variety of applications, including those requiring rectification and current sourcing in AC circuits.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range | 1V to 40V | V |
| Output Current Range | 1µA to 10mA | A |
| Current Regulation | 0.02%/V | %/V |
| Initial Accuracy | ±3% | % |
| Operating Temperature Range | -25°C to 100°C | °C |
| Package Type | SO-8 (SMD/SMT) | |
| Power Dissipation | 400 mW | mW |
| RoHS Compliance | Compliant |
Key Features
- Operates from 1V to 40V, making it versatile for various applications.
- Programmable from 1µA to 10mA, allowing for precise current control.
- Excellent current regulation with 0.02%/V, ensuring stable output.
- ±3% initial accuracy for reliable performance.
- The current is determined by an external resistor without requiring other external components.
- Reverse voltages of up to 20V draw only a few microamperes, enabling operation as a rectifier and current source in AC applications.
- The voltage on the control pin is directly proportional to the absolute temperature (°K), with a temperature coefficient of approximately 0.33%/°C.
- Zero drift can be achieved by adding an additional resistor and a diode to the external circuit.
Applications
- Current regulation in power supplies and voltage regulators.
- Temperature sensing and compensation due to its direct proportionality to absolute temperature.
- Rectification and current sourcing in AC circuits.
- Precision current sources in measurement and testing equipment.
- Automotive and industrial control systems requiring stable current outputs.
Q & A
- What is the operating voltage range of the LM234DT?
The LM234DT operates from 1V to 40V.
- What is the output current range of the LM234DT?
The output current range is from 1µA to 10mA.
- How accurate is the initial current output of the LM234DT?
The initial accuracy is ±3%.
- What is the operating temperature range of the LM234DT?
The operating temperature range is from -25°C to 100°C.
- What package type is the LM234DT available in?
The LM234DT is available in an SO-8 (SMD/SMT) package.
- How does the LM234DT handle reverse voltages?
Reverse voltages of up to 20V will only draw a current of several microamperes.
- Is the LM234DT RoHS compliant?
Yes, the LM234DT is RoHS compliant.
- What is the power dissipation limit of the LM234DT?
The power dissipation limit is 400 mW.
- How is the current regulated in the LM234DT?
The current is regulated with 0.02%/V, ensuring stable output.
- Can the LM234DT be used as a temperature sensor?
Yes, the voltage on the control pin is directly proportional to the absolute temperature (°K), making it suitable for temperature sensing applications.
