LM111 Differential Comparators: Alternative, Pinout and Datasheet

The LM111 is a  single high-speed voltage comparators. 

This devices are designed to operate from a wide range of powersupply voltages, including ±15-V supplies for operational amplifiers and 5-V supplies for logic systems. 

The output levels are compatible with most TTL and MOS circuits. 

This comparators are capable of driving lamps or relays and switching voltages up to 50 V at 50 mA. All inputs and outputs can be isolated from system ground. 

The outputs can drive loads referenced to ground, VCC+ or VCC−. Offset balancing and strobe capabilities are available, and the outputs can be wire-OR connected. 

If the strobe is low, the output is in the off state, regardless of the differential input.

Symbol

Footprint

3D Model

• Fast Response Time: 165 ns

• Strobe Capability

• Maximum Input Bias Current: 300 nA

• Maximum Input Offset Current: 70 nA

• Can Operate From Single 5-V Supply

• Available in Q-Temp Automotive

– High-Reliability Automotive Applications

– Configuration Control and Print Support

– Qualification to Automotive Standards

• On products that comply with MIL-PRF-38535, all parameters are tested unless otherwise specified. For all other products, the production process does not necessarily include testing of all parameters.

Texas Instruments LM111J-8 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments LM111J-8.

The LM111 differential comparator operational amplifier is a very popular comparator IC from Texas Instruments (TI) and has long been used for voltage comparison in electronic designs. Any op amp can be used as a voltage comparator, but the LM111 proved its advantage by placing an output transistor in its package. The collector and emitter pins of this transistor can also be controlled by hardware, which makes it suitable for many applications.

This transistor can drive loads up to 50V and 50mA and is suitable for driving most TTL, MOS and RTL loads. The transistor can also isolate the load from the system ground. Therefore, if you are looking for a voltage comparator to drive loads of these specifications, then this IC may be the right choice for you.

Like all voltage comparators, LM111 also has an inverting pin and a non-inverting pin. If the voltage on the non-inverting terminal (pin 2) is higher than the inverting terminal (pin 2), the output (pin 7) will also be high, otherwise the output will be low.

LM111 can work in single-supply voltage or dual-supply mode. Now, let's focus on the +5V supply voltage circuit, because this is the most commonly used design for digital circuits. In this type, VCC+ (pin 8) is connected to the +5V supply voltage, and VCC- (pin 4) is connected to ground to keep it at 0V potential. 

If you want to manually adjust the DC offset voltage, pins 5 and 6 on the op amp are used to set the balance voltage. These pins are usually not used because the input offset itself is better controlled. When not in use, pins 5 and 6 should be short-circuited. You can also notice that the collector pin (pin 7) of the transistor is used for output, and the emitter pin (pin 1) is grounded. This type of design is called a "collector output circuit".

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Texas Instruments (TI) is an American technology company headquartered in Dallas, Texas, which designs and manufactures semiconductors and various integrated circuits, and sells them to electronic designers and manufacturers worldwide. It is one of the top 10 semiconductor companies in global sales. The company focuses on the development of analog chips and embedded processors, which account for more than 80% of its revenue. TI also produces TI digital light processing technology and educational technology products, including calculators, microcontrollers and multi-core processors. As of 2016, the company has 45,000 patents worldwide.

Download datasheets and manufacturer documentation for Texas Instruments LM111J-8.