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Analog Devices Inc. LTC1440IMS8#PBF
- Part No.:
- LTC1440IMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1440IMS8#PBF.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,298
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Product details
Overview
LTC1440IMS8#PBF 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 25°C, 12 µs propagation delay with 10 mV overdrive, and supports battery-powered voltage monitoring in portable instrumentation.
For engineers reviewing the LTC1440IMS8#PBF datasheet, LTC1440IMS8#PBF pinout, LTC1440IMS8#PBF application, or LTC1440IMS8#PBF 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, input common-mode range extending to V– and within 1.3 V of V+, and absence of crowbar current during output transitions.
Technical Context
The LTC1440IMS8#PBF integrates a precision 1.182 V reference referenced to V–, enabling self-contained threshold detection without external references. Its comparator features rail-to-rail input capability (V– to V+ – 1.3 V), 10 pA typical input leakage, and CMOS output stage that sources up to 40 mA while maintaining microamp quiescent current.
Hysteresis is implemented externally using two resistors between REF, HYST, and V–, allowing adjustable hysteresis voltage bands up to 100 mV. The device eliminates supply glitches by avoiding cross-conducting current during logic transitions - a critical advantage in noise-sensitive, low-power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 2.1 µA typ at 25°C; ensures >10-year battery life in coin-cell–powered sensors |
| Reference Voltage | 1.182 V ±1% (0°C to 70°C); enables accurate 3.3 V or 5 V system undervoltage detection |
| Propagation Delay | 12 µs with 10 mV overdrive; supports fast response in power-good monitoring |
| Input Common-Mode Range | V– to V+ – 1.3 V; allows direct sensing of signals near ground or supply rails |
| Output Drive | Sources 40 mA continuously; directly drives LEDs, small relays, or logic inputs without buffer |
| Hysteresis Support | Programmable via HYST pin (REF – 50 mV to REF); prevents chatter on noisy thresholds |
| Operating Supply | 2 V to 11 V single or ±1 V to ±5.5 V dual; compatible with Li-ion, alkaline, and industrial supplies |
Pinout & Package
Package: 8-lead MSOP (MS8), 3 mm × 3 mm × 0.85 mm, exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference for comparator output stage | Connects to V– for single-supply operation; separates output return path from analog ground |
| V– (Pin 2) | Negative supply terminal | Accepts 0 V (GND) or negative voltage; defines reference point for internal 1.182 V reference |
| IN+ (Pin 3) | Noninverting comparator input | Supports common-mode range down to V– and up to V+ – 1.3 V; 10 pA leakage minimizes divider loading |
| IN– (Pin 4) | Inverting comparator input | Same common-mode and leakage specs as IN+; enables standard threshold or window configurations |
| 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 stably; sources 200 µA / sinks 20 µA at 25°C |
| V+ (Pin 7) | Positive supply terminal | Accepts 2 V to 11 V; requires 0.1 µF bypass if sourcing >1 mA or supply impedance is high |
| OUT (Pin 8) | CMOS push-pull output | Swings GND to V+; TTL-compatible; no crowbar current eliminates supply rail disturbance |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.1 µA typ at 25°C; extends battery life in always-on monitoring circuits |
| Integrated precision reference | 1.182 V ±1% over 0°C to 70°C; eliminates need for external reference IC or resistor divider |
| Programmable hysteresis | Adjustable 0–100 mV band via two external resistors; suppresses false triggering on noisy inputs |
| No crowbar current | Eliminates supply rail glitches during output transitions; improves system-level noise immunity |
| Wide supply range | Operates from 2 V to 11 V single supply or ±1 V to ±5.5 V dual; supports diverse power architectures |
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 via resistor divider to detect <3.0 V under-voltage condition. Use Value: 2.1 µA supply current enables multi-year operation on CR2032; built-in reference avoids calibration drift vs. resistor-based solutions. | Use Scenario: Detecting door-open events in smart lock systems using reed switch closure. IC Role / Device Role / Timing Role: Comparator triggers wake-up interrupt when magnetic field collapses and IN+ rises above REF-scaled threshold. Use Value: Programmable hysteresis prevents bounce-induced false wakes; GND-to-V+ output directly interfaces with MCU GPIO. |
| Power-Good Indicator | Glitch-Free Level Shifter |
Use Scenario: Validating stable 3.3 V rail after DC/DC converter startup in embedded controllers. IC Role / Device Role / Timing Role: Compares regulated 3.3 V against 1.182 V × (R1/R2+R1) = 3.25 V threshold with 50 mV hysteresis. Use Value: 12 µs propagation delay ensures timely assertion; no supply glitches prevent false resets during rail ramp-up. | Use Scenario: Converting 1.8 V logic signals to 5 V levels in mixed-voltage sensor interfaces. IC Role / Device Role / Timing Role: IN– tied to 1.182 V reference; IN+ accepts 1.8 V signal; OUT swings full 0–5 V. Use Value: Input common-mode range includes GND and extends to V+ – 1.3 V, enabling direct 1.8 V signal acceptance without level-shifting resistors. |
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 1.235 V reference; no hysteresis pin | Lacks programmable hysteresis and lower quiescent current; less suitable for ultra-low-power battery systems | Select MAX921ESA+ only if legacy pin compatibility is required and hysteresis is implemented externally |
| LTC1540IDC#PBF | 0.3 µA typical supply current; same 1.182 V reference; DFN-6 package; no HYST pin | Lower power but no hysteresis adjustment; smaller footprint; limited output drive (10 mA source) | Choose LTC1540IDC#PBF for nanopower (<1 µA) applications where hysteresis is unnecessary or added externally |
Compared with MAX921ESA+ and LTC1540IDC#PBF, the LTC1440IMS8#PBF uniquely balances ultralow 2.1 µA supply current, programmable hysteresis, 40 mA output drive, and MSOP-8 manufacturability - making it optimal for cost-sensitive, long-life battery monitors requiring design flexibility.
Availability
LTC1440IMS8#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 ranges.
Supply support for LTC1440IMS8#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 high-performance, low-power signal conditioning ICs for demanding industrial and medical applications.
The LTC1440IMS8#PBF belongs to Linear's micropower comparator family designed specifically for energy-constrained systems requiring integrated reference accuracy, hysteresis control, and glitch-free switching - targeting portable instrumentation, IoT edge nodes, and power management subsystems.
FAQ
What is the operating temperature range for the LTC1440IMS8#PBF?
The LTC1440IMS8#PBF is specified for operation from –40°C to +85°C (I-grade). Electrical characteristics including supply current (≤4.4 µA), reference voltage (1.164 V to 1.200 V), and input offset voltage (±10 mV) are guaranteed across this full industrial temperature range, making LTC1440IMS8#PBF suitable for automotive cabin modules and outdoor sensor nodes.
Can the LTC1440IMS8#PBF drive a 0.01 µF capacitor directly on the REF pin?
Yes, the LTC1440IMS8#PBF reference output is explicitly characterized to drive up to 0.01 µF capacitive loads without oscillation. This capability stabilizes the 1.182 V reference against transient load changes and supply noise, eliminating false comparator trips. For larger capacitors (up to 100 µF), a series damping resistor (e.g., 10 kΩ for 1 µF) is required per Figure 1 in the LTC1440 datasheet - a feature confirmed for LTC1440IMS8#PBF.
How is hysteresis programmed on the LTC1440IMS8#PBF?
Hysteresis on the LTC1440IMS8#PBF is programmed using two external resistors: R1 between REF and HYST pins, and R2 between HYST and V–. The hysteresis voltage band (VHB) equals twice the voltage difference between REF and HYST, with maximum VHB = 100 mV. For example, to achieve 30 mV hysteresis, set VHYST = REF – 15 mV using R1/R2 ratio. This configuration is validated for LTC1440IMS8#PBF in Figures 4 and 5 of the datasheet.
Does the LTC1440IMS8#PBF have rail-to-rail input capability?
The LTC1440IMS8#PBF inputs operate from V– to V+ – 1.3 V, not full rail-to-rail. At V+ = 5 V, the upper input limit is 3.7 V; at V+ = 2 V, it is 0.7 V. However, the input common-mode range includes V– (e.g., GND), enabling detection of signals near ground. This specification is guaranteed for LTC1440IMS8#PBF across –40°C to +85°C and is distinct from true rail-to-rail input amplifiers.
What is the maximum continuous output source current for the LTC1440IMS8#PBF?
The LTC1440IMS8#PBF output can continuously source up to 40 mA while maintaining microamp quiescent current and specified propagation delay. This is verified in Typical Performance Characteristics (Figure G04) and Absolute Maximum Ratings. The output remains functional up to 50 mA peak, but 40 mA is the guaranteed continuous rating for LTC1440IMS8#PBF in SO-8 and MSOP-8 packages at TA ≤ 85°C.
LTC1440IMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- 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-MSOP
LTC1440IMS8#PBF FAQ
1.How can I place an order for LTC1440IMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1440IMS8#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 LTC1440IMS8#PBF reliable?
The price and inventory of LTC1440IMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1440IMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1440IMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1440IMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1440IMS8#PBF?
LTC1440IMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1440IMS8#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 LTC1440IMS8#PBF?
For technical support, including LTC1440IMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1440IMS8#PBF requirements.
6.How does Aetrix verify that LTC1440IMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1440IMS8#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 LTC1440IMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1440IMS8#PBF?
All LTC1440IMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1440IMS8#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 LTC1440IMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1440IMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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