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Analog Devices Inc. LTC1841IS8#PBF
- Part No.:
- LTC1841IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1841IS8#PBF.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:807
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Product details
Overview
LTC1841IS8#PBF from Analog Devices (formerly Linear Technology) is an ultralow power dual comparator without integrated reference, operating from single 2V–11V or dual ±1V–±5.5V supplies. It delivers 3.5µA typical supply current, 12µs propagation delay with 10mV overdrive, open-drain outputs sinking >20mA, and rail-to-rail input range extending to within 1.3V of V+. It is used in battery voltage monitoring and low-power threshold detection circuits.
For engineers reviewing the LTC1841IS8#PBF datasheet, LTC1841IS8#PBF pinout, LTC1841IS8#PBF application, or LTC1841IS8#PBF equivalent, key selection criteria include quiescent current vs. supply voltage, input offset voltage (±10mV max), output sink capability, temperature range (–40°C to +85°C), and SO-8 package compatibility with space-constrained portable designs.
Technical Context
The LTC1841IS8#PBF implements two independent comparators with open-drain outputs and no internal voltage reference - unlike LTC1842/LTC1843 variants. Its input stage operates from V– to (V+ – 1.3V), enabling direct sensing near ground in single-supply systems. Input leakage is ±1nA max at 25°C, supporting high-impedance sensor interfaces.
Propagation delay is specified at 12µs (10mV overdrive) and 4µs (100mV overdrive), with output low voltage ≤ V– + 0.4V at 1.8mA sink. Power supply rejection ratio is 0.1–1mV/V across its full supply range, and it eliminates switching-induced supply glitches via optimized internal current steering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single: 2V to 11V; Dual: ±1V to ±5.5V - supports wide-input battery-powered systems including 1–3 cell Li-ion and alkaline stacks. |
| Quiescent Current | 3.5µA typ, 5.7µA max over temperature - enables multi-year operation on coin cells or energy-harvesting sources. |
| Input Offset Voltage | ±3mV typ, ±10mV max - ensures reliable detection of small voltage differentials in precision threshold applications. |
| Propagation Delay | 12µs @ 10mV overdrive - balances speed and power for wake-up triggers and state-change detection. |
| Output Sink Current | >20mA typical - directly drives LEDs, MOSFET gates, or logic-level inputs without external buffers. |
| Input Common-Mode Range | V– to V+ – 1.3V - allows direct connection to grounded sensors or battery terminals without level-shifting. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive cabin environments. |
Pinout & Package
Package: 8-lead plastic SO-8 (narrow, 0.150-inch width), JEDEC MS-012AC compliant, RoHS-compliant lead finish (Pb-free, matte tin).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Comparator A open-drain output | Sinks >20mA; requires external pull-up for logic-high assertion; enables wired-OR and level-shifting. |
| V– (Pin 2) | Negative supply rail | Reference for all internal circuitry; accepts ground (single-supply) or negative voltage (dual-supply). |
| IN A+ (Pin 3) | Noninverting input of Comparator A | High-impedance (±1nA leakage); common-mode range extends to V–, enabling ground-referenced sensing. |
| IN A– (Pin 4) | Inverting input of Comparator A | Matches IN A+ specs; supports differential or single-ended configurations with hysteresis via external feedback. |
| IN B– (Pin 5) | Inverting input of Comparator B | Independent of Comparator A; identical electrical specs; enables dual-threshold or window detection topologies. |
| IN B+ (Pin 6) | Noninverting input of Comparator B | Allows separate signal routing for second comparator; supports independent reference or sensor inputs. |
| V+ (Pin 7) | Positive supply rail | Accepts up to 11V; internal regulation ensures stable operation across battery discharge curves. |
| OUT B (Pin 8) | Comparator B open-drain output | Functionally identical to OUT A; supports independent control paths or redundancy schemes. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA typ enables >10-year shelf life in coin-cell–powered IoT endpoints and remote sensors. |
| No supply glitch during switching | Eliminates false wake-ups or system resets caused by internal current spikes during comparator transitions. |
| Rail-to-rail input capability | Input range includes V– and extends to within 1.3V of V+, simplifying interface with grounded sensors or battery terminals. |
| Open-drain outputs with high sink drive | 20mA+ sink capability allows direct driving of LEDs, optocouplers, or MOSFET gates without external drivers. |
| Wide supply voltage range | 2V–11V single or ±1V–±5.5V dual operation supports legacy and emerging battery chemistries without redesign. |
Applications
| Battery Voltage Monitoring | Low-Power Threshold Detection |
|---|---|
Use Scenario: Monitoring single-cell Li-ion battery voltage to trigger low-battery alert (LBO) at 3.0V and full-charge cutoff at 4.2V. IC Role / Device Role / Timing Role: LTC1841IS8#PBF acts as dual comparator comparing battery voltage against resistor-divider thresholds; one channel detects undervoltage, the other overvoltage. Use Value: 3.5µA quiescent current minimizes self-discharge impact; open-drain outputs interface directly with microcontroller GPIO or PMIC enable pins. | Use Scenario: Detecting when a 3.3V system rail drops below 3.0V to initiate graceful shutdown before brownout. IC Role / Device Role / Timing Role: LTC1841IS8#PBF compares regulated rail to a precision divider; hysteresis prevents chatter near trip point. Use Value: Input common-mode range down to V– allows direct sensing without level shifters; 12µs delay ensures timely response without excessive noise sensitivity. |
| Window Comparator | Oscillator Enable Control |
Use Scenario: Validating that a sensor output remains within 1.0V–2.0V window to confirm proper transducer operation. IC Role / Device Role / Timing Role: LTC1841IS8#PBF implements high/low thresholds using separate comparators; outputs combined via external logic or wired-OR. Use Value: Independent inputs and outputs allow flexible topology; ±10mV offset ensures accurate window boundaries even with low-gain dividers. | Use Scenario: Enabling a crystal oscillator only when main supply exceeds 2.5V, reducing startup current in portable devices. IC Role / Device Role / Timing Role: LTC1841IS8#PBF monitors V+ and asserts enable signal after valid supply is confirmed; second comparator provides reset hold-off. Use Value: Dual comparators in one SO-8 package reduce board area and component count versus discrete solutions; 2V minimum supply ensures early detection during ramp-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1842IS8#PBF | Includes 1.182V ±1% reference and HYST pin for programmable hysteresis; supply range starts at 2.5V. | Eliminates external reference but requires higher minimum supply; ideal when reference stability and hysteresis tuning are critical. | Select LTC1842IS8#PBF if reference integration reduces BOM cost and layout complexity outweighs the 0.5V higher minimum supply. |
| TLV3702IDR | Lower 1.2µA quiescent current, rail-to-rail inputs/outputs, but no hysteresis pin; 1.8V–16V supply range. | Better for ultra-low-power systems needing rail-to-rail output swing; lacks built-in reference or hysteresis control. | Choose TLV3702IDR when sub-2µA IQ is mandatory and external hysteresis or reference can be added with minimal footprint penalty. |
Compared with LTC1841IS8#PBF, LTC1842IS8#PBF adds integrated reference and hysteresis control at the cost of higher minimum supply voltage, while TLV3702IDR offers lower quiescent current and wider supply range but requires external components for reference and hysteresis - making LTC1841IS8#PBF optimal for cost-sensitive, moderate-power dual-threshold detection where external reference is already present.
Availability
LTC1841IS8#PBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, threshold detectors, window comparators, and oscillator circuits requiring stable component supply across industrial temperature grades.
Supply support for LTC1841IS8#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, emphasizing low-power, high-accuracy signal conditioning ICs for industrial, medical, and aerospace applications.
The LTC1841IS8#PBF belongs to Linear's micropower comparator family, designed specifically for long-life battery-operated systems requiring reliable voltage supervision with minimal standby current.
FAQ
What is the maximum supply voltage rating for the LTC1841IS8#PBF?
The absolute maximum supply voltage (V+ to V–) for the LTC1841IS8#PBF is 12V. Exceeding this may cause permanent damage. The recommended operating range is 2V to 11V for single-supply use or ±1V to ±5.5V for dual-supply operation. This rating is verified in the Absolute Maximum Ratings table of the official datasheet and applies across the full –40°C to +85°C temperature range.
Does the LTC1841IS8#PBF include an internal voltage reference?
No, the LTC1841IS8#PBF does not include an internal voltage reference. Unlike the LTC1842IS8#PBF and LTC1843IS8#PBF variants, the LTC1841IS8#PBF is a dual comparator-only device. Reference-based applications require an external reference source or resistor divider network. This distinction is explicitly stated in the product family description and pin function table.
Can the LTC1841IS8#PBF operate from a 1.8V supply?
No, the LTC1841IS8#PBF cannot operate from a 1.8V supply. Its minimum specified supply voltage is 2V for single-supply operation. Attempting to power it below 2V will result in undefined behavior, including failure to switch or increased propagation delay. This limit is confirmed in the Electrical Characteristics table under "Supply Voltage Range" for the LTC1841 variant.
What is the input leakage current specification for the LTC1841IS8#PBF at 25°C?
The input leakage current for the LTC1841IS8#PBF is ±0.01nA typical and ±1.0nA maximum at 25°C, as specified in the Electrical Characteristics table under "IIN Input Leakage Current". This ultra-low leakage supports high-impedance sensor interfaces and precision threshold detection without loading external dividers or sources.
Is the LTC1841IS8#PBF pin-compatible with the LTC1842IS8#PBF or LTC1843IS8#PBF?
No, the LTC1841IS8#PBF is not pin-compatible with the LTC1842IS8#PBF or LTC1843IS8#PBF. While all three share the SO-8 package, their pinouts differ: LTC1841 uses Pins 4 and 5 for IN A– and IN B–, whereas LTC1842/LTC1843 assign Pin 4 to IN B+ or IN B– and Pin 5 to HYST. Substituting them without PCB revision will cause functional failure.
LTC1841IS8#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:
- Open-Drain
- Voltage - Supply, Single/Dual (±):
- 2V ~ 11V, ±1V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 5.7µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 12µs
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LTC1841IS8#PBF FAQ
1.How can I place an order for LTC1841IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1841IS8#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 LTC1841IS8#PBF reliable?
The price and inventory of LTC1841IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1841IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1841IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1841IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1841IS8#PBF?
LTC1841IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1841IS8#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 LTC1841IS8#PBF?
For technical support, including LTC1841IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1841IS8#PBF requirements.
6.How does Aetrix verify that LTC1841IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1841IS8#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 LTC1841IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1841IS8#PBF?
All LTC1841IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1841IS8#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 LTC1841IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1841IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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