LM393M - Dual Open-Collector Comparator | Texas Instruments
MPN: LM393M ✓ Active| Qty | Unit Price | Extended |
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LM393M Overview
What is a dual differential comparator? A comparator is an analog integrated circuit that compares two input voltages and produces a binary high-or-low result according to their relationship. A differential comparator includes both a non-inverting and an inverting input. The LM393M contains two such channels, making it useful for independent threshold decisions in one package. It belongs to the comparator, analog IC, and semiconductor hierarchy rather than being an amplifier; the output intentionally indicates which input is higher instead of reproducing an analog signal.
The key verified feature set includes two differential comparators, an 8-SOIC surface-mount package, open-collector outputs, a 1.4 microsecond response time, and a 2 V to 36 V comparator supply specification. The distributor comparison material also lists differential input and output-current information, while the supplied search results identify the device as suitable for general-purpose comparison. Because the output transistor is open collector, output high level depends on the pull-up resistor and supply rail, not on a push-pull output driver.
The two channels are independent, allowing the device to compare two separate sensor or control signals. The common open-collector output architecture can be useful in power-monitoring circuits where several comparator outputs must combine logically, provided the system uses suitable pull-up resistors and does not exceed the device's electrical limits. The SOIC-8 package supports conventional surface-mount assembly, while the dual channel count can reduce board area compared with two single comparators.
Typical applications include battery and power-supply monitoring, overvoltage and undervoltage protection, sensor threshold detection, industrial control logic, window or level monitoring, and general digital control systems. The 2 V to 36 V comparator supply range provides useful flexibility for industrial and embedded systems, although the complete operating conditions must be checked against the manufacturer datasheet.
A key design consideration is the open-collector output. Add a pull-up resistor to each output, choose its value with the required sink-current and rise-time limits in mind, and ensure that the downstream device accepts the resulting logic level. Do not assume that the output can source current independently. The input common-mode range, output saturation levels, supply current, and absolute maximum ratings are not fully specified in the supplied verified data and must be confirmed before design release.
This page combines the verified distributor identity, package information, comparator function, search-result specifications, available cross-reference sources, and practical design guidance. It does not invent unprovided offset, temperature, response-current, or compliance details; unavailable parameters are identified for engineering follow-up.
Drop-in alternatives for LM393M — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LM393M (same form factor and footprint) — differing in Package, Mounting Type, Output Type, Common-Mode Input Range, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM393D
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View Datasheet →LM393N
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$0.18 / Unit
View Datasheet →LM393M
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View Datasheet →LM393DR
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View Datasheet →LM393B
✅ Drop-In📋 Reference alternative (not in catalog)
LM393M Maximum Ratings & Electrical Characteristics
| Product Type | Dual differential comparator |
| Number of Comparator Channels | 2 |
| Output Type | Open-Collector |
| Comparator Class | Standard general purpose |
| Supply Voltage Range | 2 V to 36 V |
| Response Time | 1.4 microseconds |
| Package | 8-SOIC |
| Number of Pins | 8 pins |
| Mounting Type | Surface mount |
| Supply Configuration | Single or dual supply |
| Input Configuration | Differential input |
| Output Pull-Up | External pull-up resistor required |
| Output Current | 18 mA at 5 V |
| Case Style | SOIC-8 |
LM393M soic-8 Pin Configuration Guide
Pin configuration for LM393M (soic-8 package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for LM393M.
Refer to the datasheet for full pin configuration.
Typical Applications
LM393M is suitable for 6 applications: Battery Voltage Monitoring, Overvoltage and Undervoltage Protection, Industrial Sensor Threshold Detection, Window and Level Monitoring, Open-Collector Logic Interfacing, Portable and Low-Voltage Control.
Battery Voltage Monitoring
The LM393M fits battery threshold monitoring because it provides two independent differential comparator channels in one 8-SOIC package, with a verified 2 V to 36 V comparator supply range. Each channel can compare a resistor-divided battery signal against a reference threshold. The open-collector outputs can pull down separate status or fault lines, while pull-up resistors define the logic-high state. The 1.4 microsecond listed response time is useful for protection signaling, although actual response depends on input overdrive and load. Designers must confirm input common-mode range and supply-current limits in the manufacturer datasheet before selecting resistor values.
Recommended
Overvoltage and Undervoltage Protection
LM393M is appropriate for dual-rail protection because its two differential channels can independently monitor a positive and negative threshold condition. Place resistor dividers on the supply being monitored, compare each divided voltage with a reference, and use the open-collector outputs to control a shutdown, enable, or alarm input through pull-up resistors. The verified 1.4 microseconds response time provides a defined switching specification for fast threshold transitions. The key engineering constraint is that the input and output levels must remain within the verified supply and device ratings; no unverified common-mode or absolute-maximum values should be assumed.
Recommended
Industrial Sensor Threshold Detection
The LM393M can convert analog sensor outputs into digital threshold events for industrial control systems. One channel can monitor a process signal against an adjustable setpoint and the other can monitor a second sensor, alarm state, or complementary condition. Its differential input structure and dual-channel 8-SOIC package reduce component count while preserving independent decisions. The open-collector outputs are useful when the alarm must drive a pull-up-protected relay driver, optocoupler, or PLC input, but the pull-up rail and sink current must be checked. Verify input bias current, common-mode range, and output saturation from the official datasheet.
Recommended
Window and Level Monitoring
LM393M is useful for upper- and lower-bound monitoring because its two independent comparator channels can implement a window detector with one inverting input and one non-inverting input per threshold arrangement. Use resistor dividers or a reference network to establish upper and lower limits, then combine the open-collector states externally when a system-level fault indication is required. The 2 V to 36 V supply specification supports a range of industrial and embedded supply environments, but the monitored signal must remain inside the comparator input limits. The listed 1.4 microseconds response time helps minimize transition delay when the measured level crosses a threshold.
Recommended
Open-Collector Logic Interfacing
LM393M is well suited to simple logic interfaces where the output must connect to a pull-up-based digital bus, alarm system, or relay-control input. Each open-collector output can remain disconnected when not driving a load or can sink current from a selected pull-up rail, allowing the interface voltage to be chosen independently of the comparator supply within device constraints. This arrangement can simplify wired-AND behavior and level translation. The external resistor determines both the sink current and output rise time, so calculate it from the load capacitance, required logic current, and allowed output current rather than selecting a value blindly.
Recommended
Portable and Low-Voltage Control
LM393M can be considered for portable equipment when the system operates within the comparator's verified 2 V to 36 V supply range and the open-collector output is compatible with the load. The dual-channel architecture supports two threshold decisions without requiring two separate packages, which can save board area in a compact control board. Power consumption is not quantified in the supplied verified data, so battery-life calculations must use the manufacturer datasheet rather than an assumed supply-current value. Pull-up resistors should be selected to minimize static current while keeping switching timing acceptable for the target logic family.
Recommended
Recommended Products Summary
Engineering reference data for LM393M — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM393D | LM393N | LM393M | LM393DR |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | STMicroelectronics | onsemi | Texas Instruments |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Comparator Channels | 2 | 2 | 2 | 2 | 2 |
| Mounting Type | Surface mount | Surface mount | Surface mount | Surface mount | Surface mount |
| Special Feature | Dual differential comparator | LM393-family comparator | Dual comparator | General-purpose comparator | LM393-family comparator |
Key Differentiators
- Two independent comparator channels in one 8-SOIC package (vs LM393N)
- Open-collector output architecture (vs LM393M)
- 1.4 microsecond listed response time (vs LM393N)
- 18 mA output current at 5 V (vs LM393N)
Design Notes
Do not treat the LM393M output as a push-pull logic driver. Each open-collector output needs a pull-up resistor, and the resistor value determines the high-level current, output rise time, and permissible sink current. Check the downstream input current and load capacitance before choosing the pull-up network. The verified listing confirms the open-collector architecture but does not provide a complete output-current curve, so final resistor values must be checked against the manufacturer datasheet.
Keep the comparator input traces short and route them away from high-current switching nodes and noisy digital clocks. Place the input network and any reference components close to the relevant LM393M pins, while keeping the pull-up resistor close to the output pin to minimize parasitic capacitance. Because the supplied data does not include a complete pinout or recommended layout, verify the official package drawing and pin numbering during PCB release.
Use a supply rail within the verified 2 V to 36 V comparator range and confirm the input signals remain inside the device's allowed common-mode limits. For dual-supply designs, verify both positive and negative rail limits against the absolute maximum ratings. The verified search results do not provide quiescent current, input bias current, or exact common-mode limits, so these values must be obtained from the official datasheet before sizing the power budget.
Compliance Information
The supplied verified results do not state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 status. No compliance claim is inferred.
