LM211N - Wide-Supply Voltage Comparator | STMicroelectronics
MPN: LM211N ✗ End of Life| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LM211N Overview
A voltage comparator is an analog integrated circuit that compares two input voltages and produces a logic-oriented output indicating which input is higher. In the broader semiconductor hierarchy, the LM211N belongs to the comparator class within analog and mixed-signal ICs. Its open-collector output architecture is useful when the next stage needs a pull-up supply or when multiple devices must share a wired bus.
The verified manufacturer-related results identify the LM111, LM211, and LM311 family as single high-speed voltage comparators designed for a wide range of supply voltages. The TI family description specifically highlights operation from ±15 V operational-amplifier supplies and 5 V logic supplies, while the ST result identifies low input currents and wide supply-voltage operation. The LM211N’s general-purpose comparator function supports threshold detection, sensing, switching, and control tasks.
The STMicroelectronics result describes the device as usable with standard ±15 V operational-amplifier supplies and single +5 V logic supplies. Its output is compatible with many TTL and MOS circuits, and it is capable of driving lamps or relays according to the verified TI family description. The exact STMicroelectronics LM211N electrical limits, timing values, input-offset figures, output-current limits, and temperature-grade details were not included in the supplied source snippets and are marked for data completion.
Typical applications include 5 V logic interfacing, relay or lamp drive, threshold crossing detection, industrial control, instrumentation, and systems where a comparator must operate across positive or split analog supplies. Because this product is an analog-to-logic decision element rather than a power device, SOA data is not applicable. The 8-DIP package is through-hole and is suited to legacy industrial, educational, prototype, and repair assemblies.
The principal design consideration is confirming the complete pinout, supply limits, input common-mode range, output pull-up arrangement, and timing limits from the manufacturer datasheet before replacing another LM211-family device. The supplied web results confirm the functional family and package category, but do not provide enough numeric detail to claim a fully qualified cross-brand drop-in replacement. Compare the DIP footprint, pin numbering, open-collector output, input arrangement, supply range, and propagation delay before substitution.
This page consolidates verified distributor and manufacturer-family information, identifies the LM211N’s comparator role and package category, and records missing technical values rather than guessing them. For a production replacement, use the official LM211N datasheet and validate every device-specific limit on the intended PCB.
Drop-in alternatives for LM211N — 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 LM211N (same form factor and footprint) — differing in Logic Compatibility, Mounting Type, Package, Product Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM211PW
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View Datasheet →LM311N
✅ Drop-In📋 Reference alternative (not in catalog)
LM211N
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View Datasheet →LM211N
✅ Drop-In✓ In Stock
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View Datasheet →LM211N
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View Datasheet →LM211N Maximum Ratings & Electrical Characteristics
| Product Type | Single general-purpose voltage comparator |
| Logic Compatibility | DTL, MOS, open-collector, open-emitter, RTL, and TTL compatible output |
| Supply Range | Single +5 V through ±15 V supplies |
| Output Architecture | Open-collector output |
| Output Level Compatibility | Compatible with most TTL and MOS circuits |
| Input Current | Low input currents |
| Package | 8-pin DIP |
| Mounting Type | Through-hole |
LM211N 8-pin dip Pin Configuration Guide
Pin configuration for LM211N (8-pin dip 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 LM211N.
Refer to the datasheet for full pin configuration.
Typical Applications
LM211N is suitable for 6 applications: 5 V Logic Threshold Detection, Relay Drive Interface, Lamp and Indicator Control, Analog Control and Alarm Interface, Laboratory and Educational Comparator Circuits, Legacy Industrial Control Boards.
5 V Logic Threshold Detection
The LM211N fits 5 V threshold-detection circuits because the verified family information explicitly supports single +5 V logic supplies and outputs compatible with many TTL and MOS circuits. Use it to compare a sensor or divided analog signal against a reference, then feed the decision into a digital control stage. Its open-collector output allows the interface voltage to be selected with an external pull-up, although the final resistor and output timing must be checked against the manufacturer limits. The design is useful when a legacy DIP-level logic system needs a flexible pull-up rail rather than a fixed active push-pull output.
Recommended
Relay Drive Interface
The LM211N can serve as the decision element in relay-control circuitry because the verified LM211-family description identifies relay-driving capability. The comparator output may drive a transistor stage that switches a relay coil, allowing low-current logic to control a higher-current load. Add a flyback diode across an inductive coil and verify transistor voltage and current ratings; if the open-collector output cannot sink the required current directly, use it to drive an external NPN or MOSFET. The DIP package also makes this practical for repairable industrial control boards.
Recommended
Lamp and Indicator Control
The LM211N can be used to switch lamps or indicators when the verified comparator-family output is configured with the appropriate pull-up and load driver. The comparator provides a threshold decision, while the external transistor or resistor network handles current and voltage isolation. For LED indicators, select the pull-up rail and resistor for the receiving device; for higher-current lamps, add appropriate switching margin and thermal design. This pattern is useful in legacy automation panels where a 5 V control signal must operate a larger indicator or lamp circuit.
Recommended
Analog Control and Alarm Interface
The LM211N is appropriate for analog control and alarm circuits because a voltage comparator converts the relationship between two input voltages into a discrete logic decision. The verified family description supports wide supply-voltage operation and low input currents, which helps when the monitored signal is referenced to an analog supply rather than only to 5 V logic. Use suitable input conditioning and an output pull-up, and verify the input common-mode range before operation. The result is a useful limit, over-temperature, or sensor-event signal for a controller.
Recommended
Laboratory and Educational Comparator Circuits
The LM211N’s 8-DIP through-hole package makes it convenient for laboratory breadboards, educational comparator demonstrations, and low-volume prototype assemblies. The verified distributor listing identifies the DIP package and general-purpose comparator function, allowing students or engineers to observe comparator behavior without a specialized surface-mount footprint. Connect the inputs carefully, include an output pull-up for the open-collector stage, and consult the official pinout before wiring. A shared ±15 V or single +5 V supply can simplify bench experiments, subject to the device-specific limits.
Recommended
Legacy Industrial Control Boards
The LM211N is well suited to repair and modernization of legacy industrial control boards that use DIP comparators and open-collector logic interfaces. Its through-hole 8-DIP format supports socketed or hand-soldered replacement, while the wide supply family description covers common ±15 V and +5 V system rails. Before installing it, confirm pin numbering, strobe behavior, output polarity, input common-mode limits, and required output pull-up. For safety-related or high-energy circuits, use the manufacturer’s complete electrical and temperature limits rather than relying on family-level information.
Recommended
Recommended Products Summary
Engineering reference data for LM211N — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM211P | LM311N | LM211N |
|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments |
| Comparator Type | Single general-purpose voltage comparator | Single high-speed voltage comparator | Single high-speed voltage comparator | Single high-speed voltage comparator |
| Supply Compatibility | +5 V through ±15 V family range | +5 V through ±15 V family range | +5 V through ±15 V family range | +5 V through ±15 V family range |
Key Differentiators
- General-purpose single-comparator format (vs LM311N)
- Through-hole DIP integration (vs LM211P)
- Logic-family compatibility (vs Texas Instruments LM211N)
Design Notes
Do not assume that a family-compatible comparator is automatically a drop-in replacement. The supplied search results establish an 8-DIP LM211N and related family variants, but they do not provide the complete pin table or all electrical limits. Before substitution, compare supply pins, input polarity, output pin, strobe connection, package lead spacing, output architecture, propagation delay, input common-mode range, and temperature grade.
The LM211N’s open-collector output requires an intentional pull-up strategy. Select the pull-up rail to match the receiving TTL or MOS interface, then calculate the resistor using the confirmed output sink-current and logic-level limits. The supplied sources do not include those numerical limits, so do not finalize the resistor value from generic rules alone. Confirm output transistor behavior during startup and fault states.
For a through-hole legacy board, preserve the original DIP footprint and pin numbering, and keep the comparator input traces away from high-current switching nodes. Use a local bypass capacitor on the supply pins if the circuit’s stability and datasheet recommendations call for it. Because the provided sources omit the exact pinout and decoupling guidance, route according to the official manufacturer datasheet and validate the assembled board with the intended source and load combinations.
Compliance Information
Compliance status was not present in the supplied verified snippets. AEC-Q100 is not applicable unless the specific device is explicitly qualified for automotive use; the supplied data does not provide such qualification.
