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Technical Analysis of the onsemi LM393DR2GH Dual Voltage Comparator
9/19/2026 6:46:20 PM
The LM393DR2GH is a dual independent precision voltage comparator introduced by onsemi and belonging to the classic LM393 series. The device uses an SOIC-8 surface-mount package and supports either single-supply or dual-supply operation. With low offset voltage, a wide supply range, and flexible output configuration, it is widely used in consumer electronics, industrial control, and automotive electronics.
The core parameters of the LM393DR2GH are shown in the following table:
|
Parameter |
Specification |
|
Number of comparators |
2 independent |
|
Supply voltage (single/dual) |
2 V–36 V / ±1 V–±18 V |
|
Input offset voltage |
5 mV (max) |
|
Input bias current |
0.25 µA (max @ 5 V) |
|
Output current |
16 mA (typ @ 5 V) |
|
Quiescent current |
2.5 mA (max) |
|
Output type |
Open-collector, rail-to-rail |
|
Operating temperature |
0°C–70°C |
|
Package |
SOIC-8 |
The output stage of the LM393DR2GH uses an open-collector structure, which requires an external pull-up resistor to output a high level. This design allows its output level to be compatible with a variety of logic levels, including TTL, CMOS, DTL, and ECL. In typical applications, the device is often used in overcurrent protection circuits: a sense resistor captures the current and converts it into a voltage signal, which is then compared with a threshold voltage. The comparator outputs a fault signal and triggers system protection. It is also widely used in infrared obstacle-avoidance modules, light-controlled switches, and square-wave generators.
It is worth noting that the LM393DR2GH is currently marked as discontinued by onsemi and is no longer in production. The direct replacement recommended by onsemi is the LM393EDR2G. The two are fully compatible in package and function, with only a slight extension in operating temperature range.
Q: Why must the output of the LM393DR2GH be connected to a pull-up resistor?
A: The device uses an open-collector output structure. The internal output transistor can only pull the output low; it cannot actively output a high level. Therefore, a pull-up resistor must be connected between the output and the positive supply to obtain a complete high/low output. The resistance value directly affects the rise time. A larger resistance results in a slower rise, so the design must balance power consumption and speed.
Q: The LM393DR2GH has been discontinued. How should it be replaced?
A: The first choice is onsemi's official direct replacement, the LM393EDR2G. The two have identical pin definitions and electrical characteristics and can be directly substituted. If the design requires a wider temperature range, TI's LM393B series can also be considered. Its maximum rated voltage is increased to 38 V, and its input offset voltage is as low as 0.37 mV.
Q: How can oscillation be avoided when using the LM393DR2GH?
A: The LM393 is a high-gain, wideband device. When parasitic capacitive coupling exists between the output and input, oscillation can easily occur during state transitions. During PCB layout, it is recommended to shorten the traces between the output and input as much as possible. If necessary, a small bypass capacitor can be added between the output and the supply, and a small resistor can be connected in series at the input to suppress parasitic coupling.
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