LM339M - Quad Open-Collector Comparator | Texas Instruments
MPN: LM339M ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LM339M Overview
A comparator is an analog integrated circuit that compares two input voltages and produces a digital logic state indicating which input is higher. The LM339 belongs to the broader hierarchy of analog comparator ICs, voltage-detection devices, and general-purpose signal-conditioning components. Its four independent channels allow one package to implement multiple threshold, overvoltage, undervoltage, window, or sorting decisions while sharing a common supply architecture.
Key features include four open-collector outputs, low supply current, low input bias current, low-offset operation, and an input common-mode range that includes ground on single-supply systems. Open-collector outputs require an external pull-up resistor and can support wired logic, connector interfaces, level translation, or multiple devices sharing a bus when the electrical conditions are appropriate. Unlike a push-pull output, this architecture provides useful flexibility at the cost of requiring an external pull-up and having a slower rising edge.
The LM339M can operate from 2 V to 36 V, while the verified distributor listing identifies SOIC-14 packaging and a 0 °C to 70 °C temperature grade for the listed Texas Instruments LM339M variant. The four comparators share supply pins but have independent noninverting and inverting inputs. Pin assignment and input polarity must be verified against the manufacturer datasheet before layout, especially because the M suffix identifies the package configuration rather than a different comparator function.
Typical applications include DC overvoltage and undervoltage detection, battery threshold monitoring, industrial control interfaces, sensor conditioning, open-collector alarm signaling, and four-channel comparator banks in embedded systems. A pull-up resistor on each output is normally required. Inputs must remain within the device’s common-mode limits, and supply bypass should follow the manufacturer’s recommended layout practice to reduce susceptibility to switching noise and lead instability.
This page consolidates the verified LM339M specifications, source links, packaging information, and application-oriented design guidance. It deliberately separates confirmed values from unspecified electrical details; parameters not present in the supplied data are not inferred here.
Drop-in alternatives for LM339M — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM339M/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LM339DG
✅ Drop-In📋 Reference alternative (not in catalog)
LM339M
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →LM339M/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LM339M
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →LM339M Maximum Ratings & Electrical Characteristics
| Comparator Type | Quad differential voltage comparator |
| Number of Comparators | 4 independent comparators |
| Supply Voltage Range | 2 V to 36 V |
| Input Voltage Range | ±1 V to ±18 V |
| Response Time | 1.3 µs |
| Supply Current Drain | 800 µA typical |
| Input Bias Current | 25 nA typical |
| Output Type | Open-collector |
| Package | 14-pin SOIC |
| Operating Temperature | 0 °C to +70 °C |
| Mounting Type | Surface mount |
| Number of Pins | 14 pins |
| Application Category | Standard general-purpose comparator |
| Logic Compatibility | Open-collector external pull-up interface |
| Manufacturer | Texas Instruments |
| Datasheet Description | Low-power low-offset voltage quad comparators |
| Input Common-Mode Range | Includes ground in single-supply operation |
| Drop-in Replacement Status | Use only verified pin-compatible alternatives |
LM339M 14-pin soic Pin Configuration Guide
Pin configuration for LM339M (14-pin soic 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 LM339M.
Refer to the datasheet for full pin configuration.
Typical Applications
LM339M is suitable for 6 applications: Battery Undervoltage Detection, DC Overvoltage Protection, Industrial Sensor Interfacing, Open-Collector Alarm Interface, Power-Good Sequencing, Wired-Logic Level Translation.
Battery Undervoltage Detection
The LM339M fits battery undervoltage detection because its four independent channels can monitor multiple thresholds while the verified supply range is 2 V to 36 V. Connect resistor dividers to the noninverting and inverting inputs, then use each open-collector output to signal a regulator, load switch, or controller. A pull-up resistor establishes the logic-high state. Design the divider around the battery’s maximum cell voltage and account for input bias current, offset, and threshold tolerances before setting the trip points.
Recommended
DC Overvoltage Protection
LM339M can provide an independent hardware overvoltage decision in a power-conversion or battery system. Its open-collector outputs can be wired to an inhibit, crowbar, relay driver, or digital controller input when the target voltage and sink-current requirements are verified. The 2 V to 36 V supply specification allows use across many DC rails, but the input divider, clamp strategy, response time of 1.3 µs, and fault-safe pull-up arrangement must be validated for the actual fault condition.
Recommended
Industrial Sensor Interfacing
The LM339M is appropriate for low-power industrial sensor thresholding where a sensor produces an analog signal that must be converted into a control decision. Its typical 25 nA input bias current helps reduce loading of high-impedance sensor networks, while four channels provide independent comparisons in one package. The open-collector outputs can be pulled up to the logic rail used by a controller. Protect long sensor wiring against ESD and noise, and verify the input common-mode range for every operating rail.
Recommended
Open-Collector Alarm Interface
LM339M suits alarm and fault-signaling circuits because its open-collector outputs can be connected to pull-up resistors or shared collector lines. A comparator channel can monitor a fault condition, while another channel can monitor power-good, overtemperature, or communication-line status. The pull-up voltage determines the interface level, and the output current limit must be checked against the number of wired devices. Use fail-safe logic so that a disconnected wire or power loss produces the intended alarm state.
Recommended
Power-Good Sequencing
LM339M can monitor multiple power rails and generate discrete power-good signals using its four independent comparator channels. Each channel compares a divided rail voltage against a reference or another divided rail, and the open-collector output can feed an enable, reset, or status input through a pull-up. The 2 V to 36 V operating range is useful for monitoring varied DC rails, but sequencing delays, input offset, resistor tolerance, and the target controller’s enable thresholds require calculation and bench verification.
Recommended
Wired-Logic Level Translation
LM339M can participate in simple open-collector level translation when one side uses a lower pull-up voltage and the other side uses a higher pull-up or receiving device. The open-collector structure is particularly useful for wired-AND or fault-tolerant logic because the output can sink current without actively driving a high level. Confirm voltage tolerances, leakage current, pull-up current, and logic timing at each connected node. The 1.3 µs listed response time should be checked against the required bus rise-time budget.
Recommended
Recommended Products Summary
Engineering reference data for LM339M — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM339M/NOPB | LM339DG | LM339M | LM339M |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | onsemi | onsemi | Texas Instruments |
| Package | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC |
| Comparator Count | 4 | 4 | 4 | 4 | 4 |
Key Differentiators
- Four independent comparator channels in one 14-pin SOIC package (vs LM339DG)
- Open-collector interface architecture (vs LM339M/NOPB)
- Low-power operation and low input bias (vs LM339M)
Design Notes
Do not treat LM339M as a push-pull logic device. Every open-collector output needs a pull-up resistor when a stable high level is required. Select the pull-up voltage for the receiving logic, and calculate its current using the target low-state sink requirement. The supplied data confirms the open-collector architecture but does not provide the full output-current table, so consult the manufacturer datasheet before wiring multiple alert lines or an external connector.
Place input traces and output pull-up networks close to the 14-pin SOIC, keeping the analog comparison nodes away from switching-current paths and high-impedance sensor inputs. Use a common ground reference for the comparator and threshold network, and place supply bypass capacitance at the package supply pins according to the manufacturer layout guidance. Long traces increase susceptibility to noise and can make the 1.3 µs listed response time less representative of the complete circuit.
The LM339M can operate from 2 V to 36 V, but the external pull-up, input dividers, and connected logic must also be rated for the intended voltage. Do not use the supply range as permission to exceed the absolute maximum ratings. In dual-supply systems, verify input polarity and common-mode limits against the complete datasheet; the listed ±1 V to ±18 V input range should not be treated as permission for arbitrary negative signals.
Compliance Information
The supplied verified data does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The LM339M is an analog comparator rather than an automotive-qualified device in the provided data.
