Overview
The LM239ADT is a low-power quad voltage comparator produced by STMicroelectronics. This device is part of the LM239 family, which consists of four independent precision-voltage comparators. Each comparator is designed to operate from a single power supply over a wide range of voltages, as well as from split power supplies. The LM239ADT is notable for its low input bias current, low input offset voltage, and the ability to operate with input common-mode voltage ranges that include ground, even when powered from a single supply voltage.
Key Specifications
| Parameter | Typical Value | Maximum Value |
|---|---|---|
| Supply Voltage Range | +2 to +36 V or ±1 V to ±18 V | +36 V or ±18 V |
| Supply Current | 1.1 mA | 2.5 mA |
| Input Bias Current | 25 nA | 250 nA |
| Input Offset Current | ±5 nA | ±50 nA |
| Input Offset Voltage | ±1 mV | ±5 mV |
| Input Common Mode Voltage Range | 0 to VCC - 1.5 V | 0 to VCC - 1.5 V |
| Output Saturation Voltage | 250 mV (ISINK = 4 mA) | 700 mV |
| Differential Input Voltage Range | Equal to the supply voltage | Equal to the supply voltage |
| Operating Temperature Range | -25°C to +85°C | -25°C to +85°C |
Key Features
- Wide single supply voltage range or dual supplies: +2 to +36 V or ±1 V to ±18 V
- Very low supply current (1.1 mA) independent of supply voltage
- Low input bias current: 25 nA typical
- Low input offset current: ±5 nA typical
- Low input offset voltage: ±1 mV typical
- Input common-mode voltage range includes ground
- Low output saturation voltage: 250 mV typical (ISINK = 4 mA)
- Differential input voltage range equal to the supply voltage
- TTL, DTL, ECL, MOS, CMOS compatible outputs
Applications
The LM239ADT is designed for use in various applications including level detection, low-level sensing, and memory applications. It is suitable for consumer, automotive, and industrial electronic systems where precision voltage comparison is required.
Q & A
- What is the supply voltage range for the LM239ADT?
The LM239ADT can operate from a single supply voltage range of +2 to +36 V or from dual supplies ranging from ±1 V to ±18 V.
- What is the typical supply current of the LM239ADT?
The typical supply current is 1.1 mA, independent of the supply voltage.
- What is the input bias current of the LM239ADT?
The input bias current is typically 25 nA.
- What is the input offset voltage of the LM239ADT?
The input offset voltage is typically ±1 mV.
- Does the input common-mode voltage range include ground?
- What is the output saturation voltage of the LM239ADT?
The output saturation voltage is typically 250 mV when the sink current (ISINK) is 4 mA.
- Is the LM239ADT compatible with TTL, DTL, ECL, MOS, and CMOS outputs?
- What are the typical operating temperature ranges for the LM239ADT?
The operating temperature range is -25°C to +85°C.
- What are some common applications of the LM239ADT?
The LM239ADT is used in level detection, low-level sensing, and memory applications in consumer, automotive, and industrial electronic systems.
- What is the package type for the LM239ADT?
The LM239ADT is available in SO-14 and TSSOP-14 packages among others.
