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Analog Devices Inc. LTC1440IS8#TRPBF
- Part No.:
- LTC1440IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1440IS8#TRPBF.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:14,797
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Product details
Overview
LTC1440IS8#TRPBF from Analog Devices (formerly Linear Technology) is an ultralow-power single comparator with integrated 1.182 V ±1% bandgap reference, programmable hysteresis via HYST pin, TTL/CMOS-compatible output, and operation from 2 V to 11 V single supply or ±1 V to ±5.5 V dual supply. It delivers 2.1 µA typical supply current at 0°C–70°C, 12 µs propagation delay with 10 mV overdrive, and supports battery-powered voltage monitoring in portable instrumentation.
For engineers reviewing the LTC1440IS8#TRPBF datasheet, LTC1440IS8#TRPBF pinout, LTC1440IS8#TRPBF application, or LTC1440IS8#TRPBF equivalent, key selection criteria include micropower operation below 4.4 µA over –40°C to +85°C, reference output capable of driving 0.01 µF without oscillation, adjustable hysteresis up to 100 mV, GND-referenced output swing, and SO-8 package compatibility with legacy MAX921 upgrades.
Technical Context
The LTC1440IS8#TRPBF integrates a precision 1.182 V reference referenced to V–, enabling stable threshold detection independent of supply variation. Its comparator input common-mode range extends from V– to V+ – 1.3 V, supporting rail-to-rail sensing when V– = GND.
Hysteresis is implemented externally via two resistors between REF and HYST pins, allowing precise control of switching thresholds without internal feedback loops. The output stage eliminates crowbar current during logic transitions, preventing supply glitches and ensuring clean digital signaling under dynamic load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 2.1 µA typ (0°C to 70°C); enables multi-year battery life in always-on sensor nodes |
| Reference Voltage | 1.182 V ±1% (0°C to 70°C); provides stable, temperature-compensated threshold for precision level detection |
| Propagation Delay | 12 µs with 10 mV overdrive; ensures timely response in low-speed supervisory circuits |
| Input Offset Voltage | ±3 mV max (full temp range); minimizes false triggering in high-impedance sensing applications |
| Output Drive | 40 mA source / 5 mA sink; directly interfaces with logic inputs or small LEDs without external buffers |
| Hysteresis Range | Up to 100 mV programmable; suppresses noise-induced chatter on slow-moving analog signals |
| Input Leakage | ±0.01 nA typ; preserves signal integrity in high-impedance divider networks and capacitive sensors |
Pinout & Package
Package: 8-lead plastic SO (S8), 3.9 mm × 4.9 mm × 1.5 mm, RoHS-compliant, lead-free (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference for comparator output stage | Must connect to system ground for single-supply operation; separates output return path from V– |
| V– (Pin 2) | Negative supply terminal | Connect to GND for single supply; allows true split-supply operation down to ±1 V |
| IN+ (Pin 3) | Noninverting comparator input | Accepts signals from V– to V+ – 1.3 V; 10 pA leakage enables high-Z voltage dividers |
| IN– (Pin 4) | Inverting comparator input | Same common-mode range as IN+; used for threshold comparison or window detection |
| HYST (Pin 5) | Hysteresis control input | Accepts voltage from REF – 50 mV to REF; sets hysteresis band width via external resistor network |
| REF (Pin 6) | 1.182 V reference output | Drives up to 0.01 µF bypass capacitor directly; sources/sinks up to 200 µA/20 µA |
| V+ (Pin 7) | Positive supply input | Operates from 2 V to 11 V; requires 0.1 µF bypass if sourcing >1 mA output current |
| OUT (Pin 8) | CMOS-compatible comparator output | Swings from GND to V+; TTL-level compatible; no crowbar current during transition |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.1 µA typ at 25°C; reduces self-heating and extends battery runtime in remote sensors |
| Integrated 1.182 V reference | ±1% accuracy over 0°C–70°C; eliminates need for external precision reference IC or resistor divider |
| Programmable hysteresis | Adjustable 0–100 mV band via two external resistors; prevents oscillation near threshold without op-amp feedback |
| No crowbar current | Eliminates supply rail disturbance during output transitions; improves system-level noise immunity |
| Wide supply range | 2 V to 11 V single or ±1 V to ±5.5 V dual; supports Li-ion, alkaline, and industrial DC bus supplies |
Applications
| Battery Voltage Monitor | Low-Power Threshold Detector |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during sleep mode in wearable health devices. IC Role / Device Role / Timing Role: Single comparator compares cell voltage against 1.182 V reference scaled by resistor divider to detect <3.0 V undervoltage condition. Use Value: 2.1 µA supply current enables >5-year battery life; REF drives 0.01 µF bypass cap to reject supply ripple. |
Use Scenario: Detecting door-open event in smart lock using reed switch and pull-up resistor. IC Role / Device Role / Timing Role: Comparator senses magnetic field change; HYST pin configures 50 mV hysteresis to reject contact bounce. Use Value: Programmable hysteresis eliminates need for RC debounce circuit; GND-referenced OUT directly drives MCU GPIO. |
| Microcontroller Reset Supervisor | Industrial Sensor Signal Conditioning |
|
Use Scenario: Generating clean reset pulse for Cortex-M0+ MCU during brown-out events. IC Role / Device Role / Timing Role: LTC1440IS8#TRPBF compares regulated 3.3 V rail to internal 1.182 V reference to assert reset below 2.7 V. Use Value: 12 µs propagation delay ensures deterministic reset timing; ±3 mV offset guarantees accurate trip point across temperature. |
Use Scenario: Converting thermistor resistance changes into digital alerts in HVAC control panel. IC Role / Device Role / Timing Role: Comparator monitors voltage across thermistor divider; REF provides stable reference unaffected by supply drift. Use Value: 1.182 V reference stability (±1%) over –40°C to +85°C ensures consistent trip points across operating environment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator-with-reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX921ESA+ | Higher 10 µA supply current; fixed 1.25 V reference; no hysteresis pin | Less suitable for sub-µA battery systems; requires external hysteresis components | Select LTC1440IS8#TRPBF for lowest power and integrated hysteresis control |
| LTC1540IDC#TRMPBF | 0.3 µA supply current; same 1.182 V reference; DFN-6 package; no HYST pin | Better for nanopower designs but lacks programmable hysteresis; smaller footprint | Select LTC1440IS8#TRPBF when hysteresis adjustment and SO-8 compatibility are required |
Compared with MAX921ESA+ and LTC1540IDC#TRMPBF, the LTC1440IS8#TRPBF uniquely balances ultra-low power (2.1 µA), integrated hysteresis control, and industry-standard SO-8 packaging-making it optimal for cost-sensitive, battery-operated supervisory functions where design flexibility and layout simplicity matter.
Availability
LTC1440IS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, threshold detectors, window comparators, and oscillator circuits requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1440IS8#TRPBF 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 full product support, manufacturing, and documentation for the LTC portfolio.
The LTC1440IS8#TRPBF belongs to Linear's ultralow-power comparator family designed specifically for energy-constrained applications including portable medical devices, remote sensors, and industrial IoT endpoints where microamp-level quiescent current and integrated reference stability are critical.
FAQ
What is the operating temperature range for the LTC1440IS8#TRPBF?
The LTC1440IS8#TRPBF is specified for industrial temperature range: –40°C to +85°C. Electrical characteristics including supply current (max 4.4 µA), reference voltage (1.164 V to 1.200 V), and input offset voltage (±10 mV) are guaranteed across this full range. The "I" grade suffix in LTC1440IS8#TRPBF explicitly denotes this extended temperature capability.
Can the LTC1440IS8#TRPBF drive a 0.01 µF capacitor directly on its REF pin?
Yes, the LTC1440IS8#TRPBF reference output is specifically designed to drive up to 0.01 µF bypass capacitance without oscillation. This feature stabilizes the 1.182 V reference against supply transients and load variations, eliminating the need for external buffering or damping resistors in most applications. Larger capacitors require series resistance per Figure 2 in the datasheet.
How is hysteresis programmed on the LTC1440IS8#TRPBF?
Hysteresis on the LTC1440IS8#TRPBF is programmed using two external resistors: R1 between REF and HYST pins, and R2 between HYST and V–. The hysteresis voltage band equals twice the voltage difference between REF and HYST, with maximum allowable differential of 50 mV (yielding up to 100 mV total hysteresis). The HYST pin must never float and should be tied to REF if unused.
Does the LTC1440IS8#TRPBF support dual-supply operation?
Yes, the LTC1440IS8#TRPBF supports dual-supply operation from ±1 V to ±5.5 V. Its V– pin serves as the negative rail, GND pin grounds the output stage, and V+ is the positive rail. This configuration enables true bipolar input sensing and rail-to-rail output swing relative to the dual rails-unlike the LTC1441/LTC1442 which lack separate GND and V– pins.
What is the output voltage swing of the LTC1440IS8#TRPBF?
The LTC1440IS8#TRPBF output swings from GND to V+ (not V– to V+), making it TTL-compatible in single-supply configurations. With IO = –13 mA, VOH is guaranteed ≥ V+ – 0.4 V; with IO = 1.8 mA, VOL is guaranteed ≤ GND + 0.4 V. This GND-referenced output simplifies interfacing with standard logic families and microcontrollers.
LTC1440IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- with Voltage Reference
- Number of Elements:
- 1
- Output Type:
- CMOS, TTL
- Voltage - Supply, Single/Dual (±):
- 2V ~ 11V, ±1V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- 40mA
- Current - Output (Typ):
- 4.4µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 15µs
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LTC1440IS8#TRPBF FAQ
1.How can I place an order for LTC1440IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1440IS8#TRPBF 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 LTC1440IS8#TRPBF reliable?
The price and inventory of LTC1440IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1440IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1440IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1440IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1440IS8#TRPBF?
LTC1440IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1440IS8#TRPBF 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 LTC1440IS8#TRPBF?
For technical support, including LTC1440IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1440IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1440IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1440IS8#TRPBF 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 LTC1440IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1440IS8#TRPBF?
All LTC1440IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1440IS8#TRPBF, 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 LTC1440IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1440IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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