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Analog Devices Inc. LT1018CS8#PBF
- Part No.:
- LT1018CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1018CS8#PBF.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:671
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Product details
Overview
LT1018CS8#PBF from Analog Devices (formerly Linear Technology) is a dual micropower comparator optimized for higher speed than the LT1017, operating from 1.1V to 40V supply. It delivers 110μA typical supply current at 5V, 1mV max offset voltage, and 70mA typical output sink current. Its internal Class-B pull-up eliminates external resistors and enables driving loads referenced above V+, supporting power supply monitors and relay drivers.
For engineers reviewing the LT1018CS8#PBF datasheet, LT1018CS8#PBF pinout, LT1018CS8#PBF application, or LT1018CS8#PBF equivalent, key selection criteria include its 1.1V minimum operating voltage, rail-to-rail input common-mode range including ground, open-collector–compatible output stage, and compatibility with legacy 393-type dual comparators in 8-lead SOIC packages.
Technical Context
The LT1018CS8#PBF implements two independent high-gain comparators with on-chip trimmed input offset voltage and >105dB common-mode rejection ratio. Its output stage uses a Class-B pull-up current source instead of a resistor, reducing quiescent power while enabling level-shifting drive to supplies more positive than V+.
Input bias current remains below 15nA at 25°C, and the device maintains stable operation across –40°C to +85°C (I-grade), with differential input voltage tolerance up to ±40V and absolute maximum supply voltage of 40V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.1V to 40V - supports single-cell battery (1.1V) and industrial 36V systems without level-shifting. |
| Max Offset Voltage | 1mV - ensures accurate threshold detection in precision monitoring circuits like 5V supply supervisors. |
| Supply Current (Typ) | 110μA at 5V - enables always-on sensing in low-power IoT nodes and battery-backed systems. |
| Output Sink Current | 70mA typical - directly drives relays, LEDs, or logic inputs without external buffer transistors. |
| Input Bias Current | 15nA max - minimizes loading error on high-impedance sensor sources such as thermistors or photodiodes. |
| Common-Mode Range | Includes ground to (V+ − 0.9V) - allows direct interface to ground-referenced signals in single-supply systems. |
| Package | 8-Lead Plastic SOIC (S8) - industry-standard footprint compatible with automated PCB assembly and legacy 393 layouts. |
Pinout & Package
LT1018CS8#PBF is housed in an 8-lead plastic small-outline integrated circuit (SOIC) package, narrow body (.150"), with JEDEC MS-012AC compliance and RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | –IN A | Inverting input of Comparator A - accepts reference or feedback signal for threshold comparison. |
| 2 | +IN A | Non-inverting input of Comparator A - connects to sensed voltage or sensor output for active-high detection. |
| 3 | V– | Negative supply terminal - tied to ground in single-supply operation; supports split-rail configurations. |
| 4 | OUT A | Open-collector–compatible output of Comparator A - sinks current when active; requires external pull-up only if driving logic with different VCC. |
| 5 | OUT B | Open-collector–compatible output of Comparator B - independently controllable; enables dual-threshold or window detection. |
| 6 | +IN B | Non-inverting input of Comparator B - used for second threshold (e.g., upper limit in overvoltage/undervoltage windows). |
| 7 | –IN B | Inverting input of Comparator B - accepts reference or inverted signal path for complementary logic functions. |
| 8 | V+ | Positive supply terminal - accepts 1.1V–40V; powers both comparators and internal bias circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Class-B pull-up | Eliminates external pull-up resistor, saving board space and reducing standby power in battery systems. |
| Output drives loads above V+ | Enables level-shifted interfacing to higher-voltage peripherals (e.g., 12V relays or 24V PLC inputs) without external level translators. |
| 1.1V minimum supply | Supports operation from single alkaline or NiMH cells, extending runtime in portable instrumentation and remote sensors. |
| Pin-compatible with LM393 | Allows drop-in replacement in existing designs using legacy dual comparators, minimizing redesign effort and qualification time. |
| On-chip trimmed offset | Guarantees ≤1mV max offset across temperature, improving accuracy in precision voltage monitoring without calibration. |
Applications
| Power Supply Monitor | Relay Driving |
|---|---|
Use Scenario: Monitoring 5V rail in embedded controllers to trigger fault shutdown before brownout. IC Role / Device Role / Timing Role: Dual comparator configured as window detector comparing VIN against 4.75V and 5.25V thresholds. Use Value: 1mV offset and 110μA supply current enable accurate, low-power supervision without burdening the monitored rail. | Use Scenario: Driving 12V/50mA electromechanical relay from a 3.3V microcontroller GPIO. IC Role / Device Role / Timing Role: Comparator A compares MCU output to reference; OUT A sinks relay coil current directly. Use Value: 70mA sink capability and load-above-V+ drive eliminate need for discrete NPN transistor or MOSFET driver stage. |
| Oscillator Circuits | Low-Power Sensor Interface |
Use Scenario: Building a precision relaxation oscillator using hysteresis feedback for timing in energy-harvesting nodes. IC Role / Device Role / Timing Role: LT1018CS8#PBF provides fast, low-drift switching with predictable transition times (e.g., 10μs rise/fall at 5mV overdrive). Use Value: 110μA supply current and 1.1V start-up allow continuous oscillation from harvested microwatts, sustaining system clocking. | Use Scenario: Interfacing YSI 44011 thermistor in a 1.5V-powered refrigerator alarm. IC Role / Device Role / Timing Role: Comparator B detects temperature crossing 0°C/5°C thresholds via thermistor divider network. Use Value: 15nA max input bias current prevents measurement error in high-Z thermistor networks, preserving accuracy at low supply voltages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Higher 1.5mV max offset, 250μA supply current, no internal pull-up - requires external resistor. | Less suitable for ultra-low-power or load-above-V+ drive; better for cost-sensitive, non-battery applications. | Select LM393DR only when lowest BOM cost is critical and 1.1V operation or level-shifted drive is unnecessary. |
| TLV3702IDR | Rail-to-rail inputs/outputs, 600nA supply current, 3.6V max VCC - incompatible with >3.6V supplies or 1.1V start-up. | Optimized for 1.8–3.6V precision sensing; cannot replace LT1018CS8#PBF in 5V+ or sub-1.8V systems. | Choose TLV3702IDR only for modern low-voltage mixed-signal systems where supply headroom is constrained to ≤3.6V. |
Compared with LM393DR and TLV3702IDR, the LT1018CS8#PBF uniquely balances micropower operation (110μA), wide supply range (1.1V–40V), and level-shifted output drive - making it irreplaceable in battery-backed industrial monitors and multi-rail sensor interfaces requiring single-part flexibility.
Availability
LT1018CS8#PBF is available at Aetrix Electronics and suitable for power supply monitors, relay drivers, oscillator circuits, and low-power sensor interfaces requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for LT1018CS8#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog portfolio, renowned for high-performance op amps, comparators, and power management ICs targeting demanding industrial, automotive, and instrumentation applications.
The LT1018CS8#PBF belongs to Linear's micropower comparator family, designed specifically for applications needing reliable threshold detection at ultra-low quiescent current and wide supply voltage flexibility - especially where legacy pin compatibility and robust input protection are required.
FAQ
What is the minimum operating voltage for LT1018CS8#PBF?
The LT1018CS8#PBF operates down to 1.1V, verified per Electrical Characteristics table (Note: "Minimum Operating Voltage" = 1.15V typ at 25°C, guaranteed 1.2V max across temperature). This enables direct use with single alkaline, NiMH, or LiFePO₄ cells without boost regulation, making LT1018CS8#PBF ideal for battery-critical designs like portable medical sensors or remote environmental loggers.
Does LT1018CS8#PBF require an external pull-up resistor on its outputs?
No - LT1018CS8#PBF integrates a Class-B pull-up current source, eliminating the need for external resistors in most configurations. The output can actively source current (up to ~250μA) while sinking up to 70mA, allowing direct connection to logic inputs or relay coils. LT1018CS8#PBF only requires an external pull-up if driving a logic family with VCC higher than V+ and requiring active-high signaling.
Is LT1018CS8#PBF pin-compatible with LM393?
Yes - LT1018CS8#PBF uses the same 8-pin SOIC (S8) pinout as the LM393, with identical assignments for V+, V–, OUT A/B, and both inputs per channel. This allows direct PCB-level replacement in existing LM393 designs, retaining layout and bill-of-materials integrity while upgrading to lower offset (1mV vs. 1.5mV), lower supply current (110μA vs. 250μA), and enhanced output drive capability.
What is the maximum input common-mode voltage range for LT1018CS8#PBF?
The LT1018CS8#PBF supports a common-mode input range from V– to (V+ − 0.9V), explicitly including ground in single-supply operation. At V+ = 5V, inputs function correctly from 0V to 4.1V. This rail-to-ground capability simplifies interfacing with ground-referenced sensors (e.g., thermistors, RTDs) without level-shifting circuitry - a key design advantage confirmed in the Absolute Maximum Ratings and Electrical Characteristics sections of the LT1017/LT1018 datasheet.
Can LT1018CS8#PBF drive a load referenced to a voltage higher than its own V+ supply?
Yes - the LT1018CS8#PBF output stage is explicitly designed to sink current into loads connected to a supply more positive than V+, as stated in the Description section: "output stage is also designed to allow driving loads connected to a supply more positive than the device." This enables direct control of 12V relays or 24V indicator LEDs from a 3.3V or 5V LT1018CS8#PBF supply, provided the output transistor's breakdown rating (40V) is not exceeded and sink current remains within 70mA limits.
LT1018CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Pull Up
- Voltage - Supply, Single/Dual (±):
- 1.1V ~ 40V, ±0.55V ~ 20V
- :
- 1mV @ ±20V
- Voltage - Input Offset (Max):
- 0.075µA @ ±20V
- Current - Input Bias (Max):
- 70mA @ 4.5V
- Current - Output (Typ):
- 250µA
- Current - Quiescent (Max):
- 115dB CMRR, 110dB PSRR
- CMRR, PSRR (Typ):
- 6µs
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LT1018CS8#PBF FAQ
1.How can I place an order for LT1018CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1018CS8#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT1018CS8#PBF reliable?
The price and inventory of LT1018CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1018CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1018CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1018CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1018CS8#PBF?
LT1018CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1018CS8#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT1018CS8#PBF?
For technical support, including LT1018CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1018CS8#PBF requirements.
6.How does Aetrix verify that LT1018CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1018CS8#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1018CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1018CS8#PBF?
All LT1018CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1018CS8#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT1018CS8#PBF part is unused and in its original packaging.
Return procedure for LT1018CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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