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HomeProductsIntegrated Circuits (ICs)Linear - ComparatorsLT1116CN8
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LT1116CN8 - Analog Devices Inc.

Manufacturer Part Number
LT1116CN8
Manufacturer
Analog Devices, Inc.
Allelco Part Number
32D-LT1116CN8
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
17,440 pcs available, New & Original
Parts Description
IC COMPARATOR 1 W/LATCH 8DIP
Package
8-PDIP
Data sheet
LT1116CN8.pdf

Datasheets

LT1116.pdf

PCN Obsolescence/ EOL

Mult Dev EOL 20/Jun/2021.pdf
RoHs Status
 
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In stock: 17440

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Specifications

LT1116CN8 Tech Specifications
Analog Devices Inc. - LT1116CN8 technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - LT1116CN8

Product Attribute Attribute Value
Manufacturer Analog Devices, Inc.
Voltage - Supply, Single/Dual (±) -
Voltage - Input Offset (Max) 3mV @ 5V
Type with Latch
Supplier Device Package 8-PDIP
Series UltraFast™
Propagation Delay (Max) 16ns
Package / Case 8-DIP (0.300", 7.62mm)
Package Tube
Output Type CMOS, Complementary, TTL
Product Attribute Attribute Value
Operating Temperature 0°C ~ 70°C
Number of Elements 1
Mounting Type Through Hole
Hysteresis -
Current - Quiescent (Max) 38mA
Current - Output (Typ) 20mA
Current - Input Bias (Max) 20µA @ 5V
CMRR, PSRR (Typ) 90dB CMRR, 75dB PSRR
Base Product Number LT1116

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
Moisture Sensitivity Level (MSL) 1 (Unlimited)
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

LT1116CN8 Image
LT1116CN8 (1)

Manufacturer Part Number

LT1116CN8

Manufacturer

Analog Devices, Inc.

Introduction

The LT1116CN8 is a high-speed precision comparator from Analog Devices, designed for a wide range of applications.

Product Features and Performance

Ultrafast propagation delay of 16ns

High common-mode rejection ratio (CMRR) of 90dB

High power supply rejection ratio (PSRR) of 75dB

Low input offset voltage of 3mV at 5V

High input bias current of 20μA at 5V

High output current of 20mA

Operates over a wide temperature range of 0°C to 70°C

Product Advantages

Excellent high-speed performance

Robust design with high noise immunity

Versatile compatibility and ease of use

Key Technical Parameters

Manufacturer Part Number: LT1116CN8

Package: 8-PDIP (0.300", 7.62mm)

Output Type: CMOS, Complementary, TTL

Mounting Type: Through Hole

Quiescent Current (Max): 38mA

Number of Elements: 1

Quality and Safety Features

Designed and manufactured to Analog Devices' high-quality standards

Suitable for a wide range of safety-critical applications

Compatibility

The LT1116CN8 is compatible with a variety of electronic systems and can be easily integrated into various circuit designs.

Application Areas

High-speed signal conditioning

Precision voltage comparisons

Threshold detection

Waveform shaping

Timing and control circuits

Product Lifecycle

The LT1116CN8 is an active product in Analog Devices' portfolio and is not nearing discontinuation. Replacement or upgrade options may be available from the manufacturer.

Key Reasons to Choose This Product

Exceptional high-speed performance with propagation delay of 16ns

Robust design with high noise immunity and wide operating temperature range

Versatile compatibility and ease of use in a variety of applications

Reliability and quality assured by Analog Devices' manufacturing standards

Frequently Asked Questions(FAQ)

What are the key electrical specifications of the LT1116CN8 that influence its use in precision analog signal conditioning applications?
The LT1116CN8 features an input offset voltage of 3mV at 5V supply, which directly affects accuracy in low-level signal detection scenarios. Its input bias current is limited to 20µA, minimizing loading effects on high-impedance sensor networks. The propagation delay of 16ns enables fast response for dynamic threshold comparisons. With a quiescent current draw up to 38mA, designers must consider power efficiency when operating from battery-powered systems. These parameters collectively define its suitability for industrial control loops where stability and speed trade-offs must be evaluated against available headroom.
How does the LT1116CN8 compare to other comparators in terms of propagation delay and output drive capability within the UltraFast™ series?
Within Analog Devices’ UltraFast™ family, the LT1116CN8 delivers a propagation delay of 16ns, which is competitive among general-purpose latched comparators but slightly slower than specialized high-speed variants optimized for GHz-range operation. It supports output currents up to 20mA, sufficient for driving CMOS logic gates or relay coils without requiring external buffering. Compared to non-latched counterparts, it trades some bandwidth for built-in hysteresis-free latching, making it preferable in asynchronous state machines but less ideal for continuous analog comparison tasks demanding minimal latency.
What thermal and environmental constraints should be considered when integrating the LT1116CN8 into a printed circuit board design?
The LT1116CN8 operates over a commercial temperature range of 0°C to 70°C, limiting its deployment to indoor or controlled-environment systems such as test equipment, consumer electronics, or office automation devices. It is packaged in an 8-pin PDIP, which has higher thermal resistance than surface-mount alternatives, necessitating adequate copper pour and airflow in densely populated boards to prevent junction temperatures from exceeding safe limits during sustained high-current switching. As an MSL 1 component, storage and handling are not restricted, supporting flexible manufacturing workflows.
In what types of embedded systems would the combination of latch functionality and TTL-compatible outputs in the LT1116CN8 provide significant design advantages?
The integrated latch feature allows the LT1116CN8 to retain comparison results without continuous clocking, reducing microcontroller intervention in event-driven monitoring systems like overvoltage protection circuits or level-triggered alarms. Its triple-output compatibility—CMOS, complementary, and TTL—simplifies interfacing with legacy digital logic families common in older instrumentation platforms. This makes it particularly valuable in retrofit designs or mixed-signal subsystems where signal integrity across voltage thresholds must be preserved without level-shifting circuitry.
Can the LT1116CN8 reliably interface with both modern CMOS microcontrollers and older TTL-based peripheral chips without additional translation components?
Yes, the LT1116CN8 natively supports TTL, CMOS, and complementary output stages, enabling direct connection to a broad range of digital inputs. However, care must be taken regarding output swing margins; while CMOS outputs typically rail-to-rail, TTL levels assume specific high/low thresholds that may not align precisely with modern 3.3V or 1.8V CMOS logic unless powered appropriately. Designers should verify noise margins using worst-case supply voltages and ensure pull-up resistors are sized to meet fan-out requirements if driving multiple loads.
What role does the CMRR of 90dB play in real-world applications using the LT1116CN8 for analog-to-digital decision-making?
A common-mode rejection ratio (CMRR) of 90dB indicates the LT1116CN8 can suppress noise present equally on both inputs by approximately 10,000:1 relative to differential signals. This is critical in environments with ground bounce, EMI, or shared supply noise—such as motor control or power supply monitoring—where false triggering could occur otherwise. While not as robust as instrumentation-grade amplifiers, this performance level suffices for most industrial sensing applications provided proper layout practices are followed to maintain input symmetry.
Are there any known limitations in using the LT1116CN8 for AC-coupled or high-frequency threshold detection due to its slew rate or bandwidth characteristics?
Although not explicitly rated for bandwidth, the 16ns propagation delay implies a small-signal bandwidth roughly equivalent to several hundred megahertz under typical conditions. However, large-input-step responses may exhibit slower slew rates depending on internal compensation. For sinusoidal or pulse-based thresholds above a few tens of MHz, dedicated high-speed comparators would outperform the LT1116CN8. Therefore, it is best suited for quasi-DC to sub-MHz applications where speed matters more than absolute frequency response.
How does the LT1116CN8 handle power supply rejection, and what implications does the PSRR of 75dB have for system-level noise immunity?
With a power supply rejection ratio (PSRR) of 75dB, the LT1116CN8 attenuates power supply variations by about 3,000:1 relative to input errors. This means fluctuations of 100mV on a 5V supply translate into only ~30µV of error at the comparator input—adequate for most regulated systems. However, in unregulated or ripple-prone environments, additional bulk capacitance and localized filtering near the IC pins remain advisable. The device does not specify PSRR vs. frequency, so switching regulator noise near its transition band should still be mitigated through layout and bypassing.
What considerations apply when substituting the LT1116CN8 in existing designs using alternative packages like SOIC or SSOP?
Substituting the LT1116CN8 requires verifying pinout compatibility, especially since DIP packages often reorder signals differently than surface-mount variants. Thermal performance degrades significantly in smaller packages due to reduced lead frame conductivity, potentially raising junction temperatures under continuous load. Additionally, automated assembly processes favor SMD footprints, so mechanical retention and solder joint reliability become concerns absent in through-hole configurations. Always cross-check the full datasheet including absolute maximum ratings across all package types before redesigning.
Is the LT1116CN8 suitable for automotive or military-grade applications given its operating temperature range and lack of AEC-Q100 qualification?
No, the LT1116CN8 is rated only for 0°C to 70°C operation and lacks automotive or military certifications such as AEC-Q100 or MIL-STD compliance. It is intended strictly for commercial and industrial use cases within ambient temperature ranges. Deploying it in harsh environments—such as engine compartments, aerospace avionics, or medical implants—would expose the device to risks beyond its specified limits, potentially leading to premature failure or unreliable operation.
What impact does the maximum input offset voltage of 3mV have when detecting small signals in noisy industrial settings?
A 3mV input offset introduces uncertainty in threshold detection, meaning actual trip points may vary by up to ±3mV from nominal values. When monitoring signals near this scale—such as thermocouple outputs or weak transducer readings—this variation can cause missed events or false triggers. In such cases, adding external hysteresis or using calibration routines becomes necessary to compensate. Alternatively, lower-offset devices or chopper-stabilized comparators might offer superior precision for these edge cases.
How does the quiescent current of 38mA affect battery life in portable monitoring equipment utilizing the LT1116CN8?
At 38mA maximum quiescent current, the LT1116CN8 draws substantial power even when idle, reducing battery runtime in energy-constrained applications. Assuming a 3.7V Li-ion cell with 2000mAh capacity, continuous operation would yield less than 3 hours of life—a significant limitation compared to ultra-low-power comparators drawing under 1µA. If duty cycling is used, average current drops proportionally, but wake-up delays must account for propagation latency. For long-term deployments, consider alternative architectures with sleep modes or lower-power sensing front ends.
What are the implications of using the LT1116CN8 in redundant safety-critical systems requiring fail-safe behavior?
The latch mechanism ensures state retention during transients, enhancing fault tolerance in safety-related circuits like emergency shutdowns or overcurrent monitors. However, the absence of diagnostic features such as open-drain outputs or status registers limits post-failure analysis. Since the part provides no built-in self-test or redundancy voting logic, external supervisory circuits must be implemented to validate comparator health periodically. Thus, while useful for basic fail-safe signaling, it should not serve as the sole arbiter in SIL-2 or higher rated systems without augmentation.
How does the LT1116CN8 perform under transient load conditions when switching inductive loads directly from its output stage?
Driving inductive loads such as relays or solenoids directly from the LT1116CN8’s 20mA output can induce voltage spikes due to back-EMF, risking damage to the IC unless flyback diodes and current-limiting resistors are employed. Although the device includes ESD protection, sustained overcurrent beyond 20mA may degrade performance or cause permanent shift in offset parameters. Best practice involves isolating switching elements with discrete transistors or optocouplers to protect the comparator core while maintaining fast response times.
What layout recommendations minimize crosstalk and noise coupling when routing signals adjacent to the LT1116CN8 in a mixed-signal PCB?
Maintain strict separation between analog input traces and digital return paths to avoid ground loops. Route sensitive inputs differentially with matched impedance and guard rings connected to quiet analog ground. Place bypass capacitors (e.g., 0.1µF ceramic) as close as possible to V+ and GND pins to decouple high-frequency supply noise amplified by the relatively high PSRR sensitivity. Keep output lines short and away from clock signals or high-di/dt nodes to preserve signal integrity and reduce radiated emissions.
Can the LT1116CN8 be used in window comparator configurations without modifying its internal architecture?
Yes, the LT1116CN8 can implement window detection by combining two instances in a master-slave configuration or by feeding outputs into logic gates such as AND or NOR to assert only when input lies between two thresholds. Because each element contains an independent latch, cascading them preserves state information for sequential decision-making. However, propagation delay accumulation (~32ns for dual stages) may limit maximum operating frequency in tight timing budgets. Ensure supply decoupling remains adequate to prevent degradation due to inter-device interaction.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. LT1116CN8

Product Attribute LT1116CN8#PBF LT1116CS8 LT1116CS8#TRPBF LT1116CS8#PBF
Part Number LT1116CN8#PBF LT1116CS8 LT1116CS8#TRPBF LT1116CS8#PBF
Manufacturer Analog Devices Inc. Analog Devices Inc./Maxim Integrated Analog Devices Inc. Analog Devices Inc.
Voltage - Supply, Single/Dual (±) - - - -
Voltage - Input Offset (Max) - - - -
Number of Elements - - - -
CMRR, PSRR (Typ) - - - -
Hysteresis - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Type - - - -
Propagation Delay (Max) - - - -
Current - Quiescent (Max) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Current - Output (Typ) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Series - - - -
Current - Input Bias (Max) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Base Product Number - DAC34H84 MAX500 ADS62P42
Output Type - Current - Unbuffered Voltage - Buffered -

LT1116CN8 Datasheet PDF

Download LT1116CN8 pdf datasheets and Analog Devices Inc. documentation for LT1116CN8 - Analog Devices Inc..

Datasheets
LT1116.pdf
PCN Design/Specification
Mult Dev 11/Oct/2022.pdf Multiple Parts 06/Aug/2022.pdf
PCN Obsolescence/ EOL
Mult Dev EOL 20/Jun/2021.pdf

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    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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    Purchased this DSP controller for a motor control application. Stable processing performance and very good response under varying loads.

  • FPGA***dio
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  • Nord***mbedded
    Jul 20, 2026

    Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.

  • Arch***ct
    Jul 15, 2026

    Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.

  • FPGA***lorer88
    Jul 7, 2026

    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

  • Nath***oleman
    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
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    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

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LT1116CN8 Image

LT1116CN8

Analog Devices Inc.
32D-LT1116CN8

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