LM293D Introduction
The LM293D is an integrated dual-channel voltage comparator that operates over a wide voltage range and supports both single and dual power supply modes. Its input voltage range extends close to ground level, and the output is compatible with TTL and CMOS logic circuits. With low power consumption and high precision, it is ideal for applications such as voltage monitoring, level detection, and window comparison.
This chip operates within a voltage range of 2V to 36V, offering fast response speeds and suitability for industrial control, signal processing, and automation systems. It features built-in short-circuit and overheat protection to enhance reliability and adopts a standard 8-pin package design, facilitating easy integration into various circuits.
LM293D Pinout
1OUT - Output of comparator 1
1IN- - Inverting input of comparator 1
1IN+ - Non-inverting input of comparator 1
GND - Ground
2IN+ - Non-inverting input of comparator 2
2IN- - Inverting input of comparator 2
2OUT - Output of comparator 2
LM293D Symbol
LM293D Footprint
LM293D 3D Model
LM293D Schematic Diagram
LM293D Specification
| Parameter | Specification |
| Operating Voltage | 2V to 36V (Single Supply) |
| ±1V to ±18V (Dual Supply) | |
| Input Voltage Range | 0V to VCC - 1.5V |
| Input Offset Voltage | 5mV @ 30V |
| Output Current | 18mA @ 5V |
| Input Bias Current | 0.25µA @ 5V |
| Quiescent Current | 2.5mA |
| Response Time | 1.3µs (at 5mV Overdrive) |
| Operating Temperature | -40°C ~ 105°C |
| Package | 8-SOIC |
| Output Compatibility | TTL/CMOS |
| Protection Features | Short-Circuit, Overheat |
LM293D Features
Wide single-supply voltage range or dual supplies: 2 V to 36 V or ±1 V to ±18 V
Very low supply current (0.45 mA) independent of supply voltage (1 mW/ comparator at 5 V)
Low input bias current: 20 nA typ.
Low input offset current: ±3 nA typ.
Low input offset voltage: ±1 mV typ.
Input common-mode voltage range includes ground
Low output saturation voltage: 80 mV typ. (Isink = 4 mA)
Differential input voltage range equal to the supply voltage
TTL, DTL, ECL, MOS, CMOS compatible outputs
LM393W with internal ESD protection: 2 kV HBM
LM293D Applications
Vacuum robot
Single phase UPS
Server PSU
Cordless power tool
Wireless infrastructure
Applicances
Building automation
Factory automation & control
Motor drives
Infotainment & cluster
LM293D Package
The LM293D comes in an 8-SOIC package, ideal for high-density circuit designs. The SOIC package measures 3.9mm × 4.9mm with a pin pitch of 1.27mm and a thickness of 1.75mm, meeting the miniaturization demands of modern electronic devices while offering excellent thermal performance.
The 8-SOIC packaged LM293D maintains consistent electrical performance with other package types, supporting a wide voltage range and high-temperature operating conditions. Its compact form factor is particularly suited for space-constrained applications such as industrial automation, signal processing, and embedded systems.
How to Connect LM293D?
First, identify the pin functions of the LM293D: 1OUT, 1IN-, and 1IN+ correspond to pins 1, 2, and 3, respectively; GND is pin 4; 2IN+, 2IN-, and 2OUT correspond to pins 5, 6, and 7, respectively; and VCC is pin 8. Connect pin 4 to ground (GND) and pin 8 to the positive power supply (VCC) to power the chip.
Next, based on your circuit requirements, connect the input signals to 1IN+ or 1IN-, and 2IN+ or 2IN-. For example, to compare two voltage signals, connect the reference voltage to 1IN-, and the measured voltage to 1IN+. Similarly, connect the other pair of signals to 2IN+ and 2IN-. Then, connect 1OUT and 2OUT to the load or logic circuits where you want to monitor the comparison results.
FAQs
What is the LM293D?
The LM293D is a dual-channel voltage comparator, which includes two independent comparators in a single package. It is commonly used for voltage level detection, signal comparison, and other applications where precise voltage measurement and switching are required.
How can I use the LM293D in a circuit?
The LM293D can be used in a variety of applications, such as over-voltage protection circuits, signal conditioning, pulse generation, and window comparators. The inputs should be connected to the signals you wish to compare, and the outputs can be connected to logic circuits or indicators.
Does the LM293D include any built-in protection features?
Yes, the LM293D includes short-circuit protection and thermal shutdown features to enhance reliability and prevent damage in case of abnormal operating conditions.
