Overview
The LM234Z-3/NOPB is a 3-terminal adjustable current source produced by Texas Instruments. This device is part of the LM134/LM234/LM334 family, known for their versatility and precision in current regulation. The LM234Z-3/NOPB operates within a temperature range of -25°C to +100°C, making it suitable for a variety of applications requiring stable current sources over a wide temperature range.
Key Specifications
| Parameter | Units | Min | Typ | Max |
|---|---|---|---|---|
| Operating Voltage Range | V | 1 | 40 | |
| Reverse Voltage | V | 20 | ||
| Set Current Range | μA | 1 | 10,000 | |
| Set Current Error (V+=2.5V) | % | ±1 | ±2 | |
| Temperature Coefficient of Set Current | %/°C | 0.336% | ||
| Operating Temperature Range | °C | -25 | 100 | |
| Power Dissipation | mW | 400 | ||
| ESD Susceptibility | V | 2000 |
Key Features
- Operates from 1V to 40V, allowing for a wide dynamic voltage range.
- Programmable from 1μA to 10mA with a simple external resistor connection.
- True 2-terminal operation with no separate power supply connections required.
- Excellent current regulation with 0.02%/V.
- Available as a fully specified temperature sensor with ±3°C initial accuracy.
- Reverse applied voltages of up to 20V draw only a few dozen microamperes of current, making it suitable for AC applications.
Applications
- Bias networks: The LM234Z-3/NOPB can be used to provide stable current sources in biasing circuits.
- Surge protection: Its ability to handle reverse voltages makes it useful in surge protection circuits.
- Low power reference: Ideal for applications requiring low power current references.
- Ramp generation: Can be used to generate ramps in various circuits.
- LED driver: Suitable for driving LEDs with precise current control.
- Temperature sensing: The device can be used as a temperature sensor due to its temperature-dependent current output.
Q & A
- What is the operating voltage range of the LM234Z-3/NOPB?
The operating voltage range is from 1V to 40V. - What is the temperature range for the LM234Z-3/NOPB?
The operating temperature range is from -25°C to +100°C. - How is the set current programmed in the LM234Z-3/NOPB?
The set current is programmed using a simple external resistor connection. - What is the maximum power dissipation for the LM234Z-3/NOPB?
The maximum power dissipation is 400 mW. - Is the LM234Z-3/NOPB suitable for AC applications?
Yes, it can handle reverse applied voltages of up to 20V, making it suitable for AC applications. - What is the initial accuracy of the set current for the LM234Z-3/NOPB?
The initial accuracy of the set current is ±3%. - Can the LM234Z-3/NOPB be used as a temperature sensor?
Yes, it can be used as a temperature sensor due to its temperature-dependent current output. - What is the ESD susceptibility of the LM234Z-3/NOPB?
The ESD susceptibility is 2000V. - What packages are available for the LM234Z-3/NOPB?
The device is available in TO-92 packages. - Does the LM234Z-3/NOPB have built-in ESD protection?
No, it has limited built-in ESD protection, and precautions should be taken during storage and handling.
