LM339F-E2 - 4-Channel 3-32V Comparator | ROHM Semiconductor
MPN: LM339F-E2 ✗ End of LifeLM339F-E2 Overview
A comparator is a voltage-regulating semiconductor that evaluates two input voltages and produces a digital output indicating their relationship. The LM339 family belongs to the comparator hierarchy, alongside linear ICs such as amplifiers, while differing from op amps because its output is designed for logic-level signaling rather than linear amplification. The LM339F-E2 combines four ground-sense comparators in one package, reducing component count and simplifying routing in multi-channel sensing systems.
The key operating characteristics are the 3 V to 32 V supply range, four-channel configuration, ground-sense input arrangement, and open-collector outputs. The open-collector architecture allows each output to be pulled up to a suitable external voltage and permits multiple outputs to share a wired bus when the design requires wired-AND behavior. External pull-up resistors are required because the output transistors do not actively drive the output high.
The SOP14 package supports conventional surface-mount assembly and provides separate access to four comparator channels. Applications include process-control thresholds, industrial sensor interfaces, battery and power-system monitoring, overvoltage detection, signal translation, and four-channel digital sensing. Because the output stage is open collector, output rise time and logic-level compatibility depend on the pull-up resistor, load capacitance, and intended system voltage.
Designers should verify input common-mode range, output pull-up voltage, input offset behavior, and response timing against the manufacturer datasheet for each operating condition. A pull-up resistor should be placed close to each output to limit trace capacitance and switching noise. Where multiple open-collector outputs are connected together, every output must remain electrically compatible with the shared bus and appropriate current limiting must be included.
This page organizes the manufacturer product information, lifecycle status, verified source links, cross-reference candidates, application guidance, and design notes into a practical engineering reference. It also distinguishes documented electrical characteristics from parameters that require confirmation before schematic release or production qualification.
Drop-in alternatives for LM339F-E2 — 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 LM339F-E2 (same form factor and footprint) — differing in Package, Output Type, Comparator Type, Number of Channels, Total Pin Count.
LM393F-E2
✅ Drop-InContact for price
View Datasheet →LM339L-D14-T
✅ Drop-In📋 Reference alternative (not in catalog)
LM339D
✅ Drop-InContact for price
View Datasheet →NJM339M-
✅ Drop-In📋 Reference alternative (not in catalog)
LM339F-E2 Maximum Ratings & Electrical Characteristics
| Comparator Type | Ground Sense Comparator |
| Number of Channels | 4 channels |
| Operating Supply Voltage Range | 3 V to 32 V |
| Output Type | Open Collector |
| Input Configuration | Ground Sense |
| Package | SOP14 |
| Packing Type | Taping |
| Mounting Type | Surface Mount |
| Lifecycle Status | Not Recommended for New Designs |
| Total Pin Count | 14 pins |
LM339F-E2 sop14 Pin Configuration Guide
Pin configuration for LM339F-E2 (sop14 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 LM339F-E2.
Refer to the datasheet for full pin configuration.
Typical Applications
LM339F-E2 is suitable for 6 applications: Industrial Process Threshold Detection, Battery Power Monitoring, Overvoltage and Undervoltage Protection, Sensor Interface and Conditioning, Logic-Level Signal Translation, Motor and Solenoid Control.
Industrial Process Threshold Detection
The LM339F-E2 fits four-channel process monitoring because its four ground-sense comparator sections can evaluate separate sensor thresholds without requiring four separate packages. The 3 V to 32 V operating supply supports a broader range of industrial signal levels than a 5 V-only comparator. Use each channel to compare a conditioned process signal with a reference and drive an open-collector alarm or control input. Because the outputs are open collector, appropriate pull-up resistors establish the logic-high state. Confirm the input common-mode range, offset, propagation delay, and output sink-current limit in the manufacturer datasheet before assigning thresholds or fan-out requirements.
Recommended
Battery Power Monitoring
The LM339F-E2 can monitor several battery-related thresholds when the supply rail remains within its 3 V to 32 V operating range. Its four-channel arrangement allows undervoltage, overvoltage, or multiple cell-level conditions to be evaluated using separate reference signals. The open-collector outputs can pull down an enable line, status indicator, or protection input while an external resistor establishes the opposite logic state. Design the input network so all sensed voltages remain inside the comparator's common-mode range. Battery protection designs should also account for input transients, open-collector pull-up selection, and the propagation delay required by the system shutdown sequence.
Recommended
Overvoltage and Undervoltage Protection
The LM339F-E2 is appropriate for basic overvoltage and undervoltage detection because it provides four independent comparisons with open-collector fault outputs in one SOP14 package. Each comparator can compare a divided supply signal against a reference and assert a fault when the crossing condition is reached. Open-collector outputs are useful in protection systems because multiple fault channels can share a common pull-up without driving the line high against one another. The protection threshold accuracy depends on resistor tolerances, input offset, and the reference circuit. Confirm the allowed input and supply voltages, output sink capability, and channel-to-channel behavior against the manufacturer datasheet before defining reset or latch logic.
Recommended
Sensor Interface and Conditioning
The LM339F-E2 can convert conditioned sensor signals into logic-level events when a system must detect a threshold rather than measure a continuously changing analog value. Its four ground-sense channels allow one package to serve multiple digital sensor inputs, such as temperature, level, or contact-type feedback. The comparator compares the conditioned sensor voltage with a reference and uses its open-collector output to signal the state. Select the reference and input divider carefully to limit sensitivity to offset and noise. Use the manufacturer electrical limits to establish the usable common-mode window, and place pull-up resistors near the device to minimize output trace capacitance.
Recommended
Logic-Level Signal Translation
The LM339F-E2 can support level translation when a sensor or legacy circuit uses a voltage different from the receiving logic system. The open-collector output is pulled up to the destination logic voltage, while the input side evaluates the incoming threshold through a suitable divider or reference. This arrangement prevents the comparator output from exceeding the selected pull-up rail. The operating supply range of 3 V to 32 V allows use in systems above ordinary 5 V logic, although the input common-mode and absolute-maximum limits still govern the usable signal range. Validate timing, fan-out, bus capacitance, and power-off behavior in the target system before production release.
Recommended
Motor and Solenoid Control
The LM339F-E2 can support simple current, position, or limit decisions in motor and solenoid-control systems when its input signals stay within the specified common-mode range. Four channels can monitor separate limit switches, control loops, or feedback contacts, while the open-collector outputs can drive suitable relay, transistor, or logic interface stages. The comparator is generally more appropriate as a threshold element than as a complete motor driver, so external switching and protection hardware remain necessary. Check the output sink current, propagation delay, and input response behavior in the manufacturer datasheet, and include pull-up resistors for every output that must present a defined high state.
Recommended
Recommended Products Summary
Engineering reference data for LM339F-E2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM393F-E2 | LM339L-D14-T | LM339D | NJM339M-(TE2) |
|---|---|---|---|---|---|
| Brand | ROHM Semiconductor | ROHM Semiconductor | ROHM Semiconductor | Texas Instruments | New Japan Radio |
| Package | SOP14 | SOP14 | SOP14 | SOIC-14 | SOP14 |
| Pin Count | 14 pins | 14 pins | 14 pins | 14 pins | 14 pins |
Key Differentiators
- Four ground-sense channels in one SOP14 package (vs LM339D)
- Wide operating supply range (vs NJM339M-(TE2))
- Four channels reduce package count in threshold systems (vs LM393F-E2)
Design Notes
Do not assume that a 14-pin comparator can replace another 14-pin comparator without checking the pin map. Compare each LM339F-E2 channel, supply pin, output pin, and signal-ground arrangement against the candidate datasheet. Also verify input common-mode limits and output-current ratings; matching pin count and package dimensions do not by themselves guarantee electrical drop-in compatibility.
Place the pull-up resistor for each open-collector output close to that output pin. A short output trace limits sensitivity to capacitive loading and helps produce the intended rising edge. When several outputs share a pull-up, route the common node away from sensitive analog inputs and maintain a low-impedance ground reference so switching current does not disturb the threshold signals.
Design the input divider and reference network around the comparator's actual input range rather than only its 3 V to 32 V supply rating. Confirm the allowable common-mode voltage, differential input range, input offset, and supply-current limits in the manufacturer datasheet. If the sensed node can exceed the supply rail, add appropriate clamping and protection components.
Keep the comparator, threshold-setting resistors, and input components away from high-current switching paths and inductors. Route the reference signal as a short trace over a continuous ground plane, and place bypass capacitance at the device supply pins according to the manufacturer application guidance. Poor return-current paths can shift the switching threshold and create false fault indications.
Compliance Information
The verified manufacturer product information confirms package, packing type, operating supply range, comparator configuration, and lifecycle status but does not provide specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations.
