LM111 - High-Speed Differential Comparator | Texas Instruments
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LM111 Übersicht
A voltage comparator is an analog integrated circuit that compares two input voltages and produces a digital logic state indicating which input is higher. The LM111 belongs to the comparator category within analog and interface ICs, and its differential inputs make it useful for threshold detection, signal conditioning, timing, and control systems. Unlike an operational amplifier intended primarily for linear amplification, the comparator is optimized for rapid state changes and logic-level output compatibility.
The LM111, LM211, and LM311 family is designed around a wide supply-voltage range, including ±15 V operational-amplifier supplies and 5 V logic systems. The output levels are compatible with many TTL and MOS circuits, allowing the LM111 to bridge analog sensing and digital control. Its differential input arrangement supports sensing a small difference between two voltages while presenting a logic result to downstream circuitry.
The LM111 family also includes related temperature grades and device variants. Texas Instruments states that the LM111-N has the same pin configuration as the LM106 and LM710, while the LM211-N and LM311-N provide different specified temperature ranges. The exact LM111 pin configuration and electrical limits must be confirmed against the applicable manufacturer datasheet and package variant before production release.
Typical applications include line and threshold comparators, pulse and window detection, level translation into TTL or MOS logic, industrial control interfaces, analog signal conditioning, and legacy instrumentation. Because the output is open collector or open emitter, a pull-up or pull-down load resistor is generally required at the output. This architecture can provide wired logic behavior and flexible output interfacing, but it also makes pull-device selection and output speed part of the system design.
When selecting a replacement, verify the package, pinout, supply limits, input offset and bias behavior, response time, output topology, and temperature grade. The verified material supports the LM111 identity and family-level characteristics, but it does not provide enough verified information here to reproduce every electrical limit or package drawing. This page therefore distinguishes documented values from parameters requiring confirmation rather than guessing them.
Drop-in-Alternativen für LM111 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit LM111 (gleiche Bauform und Footprint) – abweichend in Product Type, Maximum Input Offset Current, Package.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
LM211-N
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
LM311-N
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
LT1011
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
NTE922
✅ Drop-In✓ Auf Lager
$10.136 / Stück
Datenblatt ansehen →LT111A
✅ Drop-In✓ Auf Lager
Preis auf Anfrage
Datenblatt ansehen →LM111 Grenzwerte & elektrische Eigenschaften
| Product Type | Single high-speed differential voltage comparator |
| Supply Voltage Range | Single 5 V through ±15 V supplies |
| Maximum Input Bias Current | 300 nA |
| Maximum Input Offset Current | 70 nA |
| Output Topology | Open-collector and open-emitter |
| Logic Compatibility | Compatible with most TTL and MOS circuits |
| Control Function | Strobe capability |
| Differential Input | Two differential voltage inputs |
| Gehäuse | TO-99-8 metal can package |
| Pin-Anzahl | 8 pins |
LM111 to-99-8 metal can package Pinbelegungsleitfaden
Pinbelegung für LM111 (to-99-8 metal can package-Gehäuse). Dieses analoge Bauteil verfügt über Eingangs-, Ausgangs- und Versorgungspins. Offset-Null-, Kompensations- und Enable-Pin-Konfigurationen entnehmen Sie dem Herstellerdatenblatt. Ideal für Signalaufbereitung und Verstärkerschaltungen.
Keine detaillierten Pinbelegungsdaten verfügbar für LM111.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
LM111 ist geeignet für 6 Anwendungs: Voltage Threshold Detection, TTL and MOS Logic Interfacing, Pulse and Window Detection, Industrial Control and Automation, Analog Signal Conditioning, Legacy Instrumentation and Test Equipment.
Voltage Threshold Detection
The LM111 fits threshold detection because it compares two differential input voltages and produces a logic-oriented result when their relationship crosses the decision point. A 5 V or ±15 V supply arrangement can match the surrounding analog and logic system, while the open-collector/open-emitter output can be pulled to the required logic level. The designer should verify input common-mode limits, offset behavior, and propagation delay in the manufacturer datasheet. In a practical circuit, keep the sensed nodes within the comparator’s valid input range and provide a stable pull device at the output. This use is appropriate when the system needs a binary decision from a slowly varying or noisy analog quantity rather than a linear amplified output.
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TTL and MOS Logic Interfacing
LM111 is suited to bridging an analog decision to TTL or MOS logic because Texas Instruments describes its output levels as compatible with most TTL and MOS circuits. The open-collector and open-emitter architecture allows the output to be connected through an appropriate pull-up or pull-down network, which is useful when multiple stages need a shared wired output or when the logic rail differs from the analog supply. Resistor selection affects speed, current, and noise immunity, so the output specification must be checked before finalizing the network. The LM111 family can therefore serve as an interface element in legacy control, measurement, and test equipment where modern logic input thresholds are not directly suitable.
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Pulse and Window Detection
The LM111 can compare a signal against a reference or compare two sensed signals to detect pulse presence, amplitude windows, or transition events. Its differential inputs allow the decision to depend on a voltage difference, which is useful when a reference node tracks part of the signal rather than remaining fixed at ground. The verified material identifies the device as a high-speed comparator, but response-time values are not supplied in the extracted data, so timing margins must be taken from the applicable datasheet. Add hysteresis or filtering when the input crosses the threshold slowly, and confirm that the selected pull resistor does not make the output transition too slow for the system timing budget.
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Industrial Control and Automation
LM111 can be used in legacy industrial control circuits that require a binary decision from a sensor or conditioned analog signal. A supply of 5 V can support logic-oriented systems, while ±15 V operation is consistent with older analog instrumentation. The differential input arrangement helps compare sensed quantities against references, and the open output can be adapted to relay, alarm, or digital-control interfaces with the correct pull device. Temperature qualification remains important in industrial environments: the verified LM111-N information identifies a −55 °C to +125 °C range, while LM211-N and LM311-N use narrower ranges. Verify the exact suffix and environmental requirements before selecting a device for production equipment.
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Analog Signal Conditioning
LM111 is applicable where a control system needs a sharp binary transition from an analog measurement rather than a continuously amplified waveform. The comparator can evaluate a signal relative to another node and provide a logic result that enables or disables downstream circuitry. Because the verified data does not provide complete input offset, common-mode, response-time, or supply-current limits, the circuit must be validated from the manufacturer datasheet and tested for noise, saturation, and switching behavior. Use short, well-routed input connections and stable reference nodes. The resulting interface is useful in instrumentation, alarm circuits, and control loops where a digital state is more useful than a linear output.
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Legacy Instrumentation and Test Equipment
The LM111 is relevant to repair and redesign of older instrumentation that used discrete TTL or MOS logic alongside analog signal paths. Its wide supply-voltage concept supports systems built around 5 V logic or ±15 V analog supplies, while its comparator output can trigger measurement, alarm, or sequencing functions. The metal-can TO-99-8 package may also be mechanically different from modern surface-mount comparators, so the PCB footprint must be checked before replacement. Verify the exact pinout, temperature grade, output pull arrangement, and any manufacturer lifecycle notice. This application is most appropriate when maintaining an existing design or reproducing a historical reference circuit rather than creating a new compact mixed-signal board.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für LM111 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | LM211-N | LM311-N | LT1011 | NTE922 | LT111A |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | NTE | Analog Devices |
| Product Type | Single high-speed differential voltage comparator | Comparator | Comparator | General-purpose comparator | Comparator | General-purpose comparator |
Wichtigste Unterscheidungsmerkmale
- Wider temperature specification than LM211-N (vs. LM211-N)
- Wider temperature specification than LM311-N (vs. LM311-N)
- Established LM111-family function and supply concept (vs. LT1011)
- Input bias current of 300 nA maximum (vs. LT1011)
Designhinweise
Do not treat LM211 or LM311 as unconditional replacements for LM111. The verified Texas Instruments information gives LM111-N a −55 °C to +125 °C specification, LM211-N a −25 °C to +85 °C specification, and LM311-N a 0 °C to +70 °C specification. Confirm temperature, package, pinout, output topology, and supply requirements before substitution. This is especially important in industrial or outdoor equipment where the reduced LM211-N and LM311-N ranges may eliminate the available thermal margin.
The LM111 output is identified as open collector and open emitter, so the output network must include a suitable pull-up or pull-down device unless the surrounding circuit already provides one. Resistor value sets sink or source current, logic rise or fall time, power dissipation, and susceptibility to leakage or noise. Calculate the resistor from the actual load voltage and output current limits in the manufacturer datasheet, then verify timing at the highest expected temperature. Do not add a resistor value without those operating-point values.
Keep the two differential inputs and their reference node short and appropriately routed so switching currents do not create differential noise near the decision threshold. If the input signal crosses the threshold slowly, add controlled hysteresis or filtering to prevent repeated output transitions; exact resistor and capacitor values require the verified input offset, response-time, and noise specifications. Validate the final board because the supplied data does not provide a complete common-mode range or response-time specification.
The LM111 is identified as an 8-pin TO-99-8 metal-can package, so PCB layout must provide the correct mechanical footprint, lead spacing, and pin numbering before any replacement is approved. Do not substitute a modern surface-mount comparator without checking pin functions and output polarity. For a legacy design, preserve the original pull-device arrangement and compare the replacement’s supply, input, output, and strobe requirements against the original schematic.
Compliance-Informationen
The supplied verified web data does not provide LM111-specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Do not infer these values from the manufacturer brand or from related comparator families.
