Overview
The LM139J/SCA, produced by Texas Instruments, is a quad differential comparator integrated circuit designed for low power consumption and low offset voltage. This device consists of four independent voltage comparators that can operate from a single power supply over a wide range of voltages, as well as from dual supplies. The LM139J/SCA is characterized for operation over the full military temperature range of –55°C to +125°C, making it suitable for a variety of applications requiring high reliability and precision.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range (Single Supply) | 2 V to 36 V | V |
| Supply Voltage Range (Dual Supplies) | ±1 V to ±18 V | V |
| Supply Current Drain | 0.8 mA (Typical) | mA |
| Input Bias Current | 25 nA (Typical) | nA |
| Input Offset Current | 3 nA (Typical) | nA |
| Input Offset Voltage | 2 mV (Typical) | mV |
| Common-Mode Input Voltage Range | Includes Ground | |
| Differential Input Voltage Range | Equal to Maximum-Rated Supply Voltage: ±36 V | V |
| Output Saturation Voltage | Low | |
| Output Compatibility | TTL, MOS, and CMOS | |
| Operating Temperature Range | –55°C to +125°C | °C |
| Package Type | CDIP (14 pins) |
Key Features
- Wide supply voltage range: 2 V to 36 V for single supply and ±1 V to ±18 V for dual supplies.
- Low supply current drain: 0.8 mA (typical), independent of supply voltage.
- Low input bias current: 25 nA (typical).
- Low input offset current: 3 nA (typical).
- Low input offset voltage: 2 mV (typical).
- Common-mode input voltage range includes ground.
- Differential input voltage range equal to maximum-rated supply voltage.
- Low output saturation voltage.
- Output compatible with TTL, MOS, and CMOS.
- Operates over the full military temperature range of –55°C to +125°C.
Applications
The LM139J/SCA is suitable for various applications requiring precision voltage comparison, including:
- Military and aerospace systems due to its compliance with MIL-PRF-38535.
- Industrial control systems where reliable and precise voltage comparison is critical.
- Automotive systems that require operation over a wide temperature range.
- Medical devices that demand low power consumption and high accuracy.
- General-purpose comparator applications in electronic circuits.
Q & A
- What is the supply voltage range for the LM139J/SCA?
The LM139J/SCA can operate from a single supply voltage of 2 V to 36 V and from dual supplies ranging from ±1 V to ±18 V.
- What is the typical supply current drain of the LM139J/SCA?
The typical supply current drain is 0.8 mA, which is independent of the supply voltage.
- What is the input bias current of the LM139J/SCA?
The input bias current is typically 25 nA.
- What is the input offset voltage of the LM139J/SCA?
The input offset voltage is typically 2 mV.
- Is the output of the LM139J/SCA compatible with other logic families?
- What is the operating temperature range of the LM139J/SCA?
The operating temperature range is –55°C to +125°C.
- What package types are available for the LM139J/SCA?
The LM139J/SCA is available in a 14-pin CDIP package.
- Can the LM139J/SCA be used in military applications?
- How can the outputs of multiple LM139J/SCA comparators be connected?
The outputs can be connected to achieve wired-AND relationships by tying multiple open-collector outputs together.
- What precautions should be taken for the input voltages of the LM139J/SCA?
Protection should be provided to prevent the input voltages from going negative more than –0.3 VDC at 25°C. An input clamp diode can be used for this purpose.
