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Analog Devices Inc. LTC1440IMS8#TRPBF
- Part No.:
- LTC1440IMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1440IMS8#TRPBF.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,190
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Product details
Overview
LTC1440IMS8#TRPBF from Analog Devices (formerly Linear Technology) is an ultralow-power single comparator with integrated 1.182V ±1% voltage reference, programmable hysteresis via HYST pin, TTL/CMOS-compatible output, and operation from 2V to 11V single supply. It delivers 2.1µA typical supply current at 25°C, 12µs propagation delay with 10mV overdrive, and supports battery-powered voltage monitoring and threshold detection.
For engineers reviewing the LTC1440IMS8#TRPBF datasheet, LTC1440IMS8#TRPBF pinout, LTC1440IMS8#TRPBF application, or LTC1440IMS8#TRPBF equivalent, key selection criteria include micropower operation down to 2V supply, reference output capable of driving 0.01µF bypass capacitors without oscillation, input common-mode range extending to V– and within 1.3V of V+, and MSOP-8 package compatibility with space-constrained portable designs.
Technical Context
The LTC1440IMS8#TRPBF integrates a precision bandgap reference (1.182V ±1% over –40°C to +85°C) and a rail-to-rail input comparator stage with no crowbar current during switching-eliminating supply glitches. Its HYST pin enables resistor-programmed hysteresis up to 100mV total band (±50mV around REF), with guaranteed operation across ±1V to ±5.5V dual supplies or 2V–11V single supply.
Input leakage is ±10pA typical, enabling high-impedance sensing; output drives up to 40mA source / 5mA sink while maintaining µA quiescent current; reference output sustains ≤5mV deviation under 1mA source load and ≤1.5mV under 10µA sink load. The device is specified for industrial temperature range (–40°C to +85°C) and features GND-connected output stage for TTL-level compatibility in single-supply configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 2.1µA typ at 25°C; enables multi-year battery life in coin-cell-powered systems |
| Reference Voltage | 1.182V ±1% (0°C to 70°C); stable internal reference eliminates external voltage divider need |
| Propagation Delay | 12µs with 10mV overdrive; sufficient for slow-varying signals like battery voltage monitoring |
| Input Common-Mode Range | V– to V+ – 1.3V; supports sensing near ground or high-side rails without level-shifting |
| Output Drive | 40mA source / 5mA sink; directly interfaces with logic inputs or small LEDs without buffer |
| Hysteresis Control | Programmable via HYST pin (REF – 50mV to REF); prevents chatter on noisy thresholds |
| Operating Supply | 2V to 11V single supply or ±1V to ±5.5V dual supply; accommodates wide battery chemistries |
Pinout & Package
Package: 8-lead MSOP (MS8), 3.0mm × 3.0mm × 0.85mm body, exposed pad optional for thermal enhancement. Pin 1 marked with dot; pin 1 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference for output stage | Connects to system ground; enables TTL-compatible low-level output (GND to V+ swing) |
| V– (Pin 2) | Negative supply rail | Connect to GND for single supply; allows split-supply operation when biased negative |
| IN+ (Pin 3) | Noninverting comparator input | Accepts signals from V– to V+ – 1.3V; 10pA leakage preserves high-Z sensor interfaces |
| IN– (Pin 4) | Inverting comparator input | Same common-mode range as IN+; used for threshold comparison or window configurations |
| HYST (Pin 5) | Hysteresis control input | Connected to REF via resistor network to set hysteresis band (max 100mV total) |
| REF (Pin 6) | 1.182V reference output | Drives up to 0.01µF capacitor directly; sources 100–120µA with <5.5mV error |
| V+ (Pin 7) | Positive supply rail | 2V–11V operation; bypass with 0.1µF if sourcing >1mA output current |
| OUT (Pin 8) | CMOS comparator output | Swings rail-to-rail (GND to V+); sinks 5mA / sources 40mA; no crowbar current |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.1µA typ at 25°C - extends battery life in always-on monitoring circuits |
| Integrated 1.182V reference | ±1% accuracy over 0°C–70°C - removes need for external reference IC or resistor divider |
| Programmable hysteresis | Up to 100mV total band via two external resistors - suppresses noise-induced false triggering |
| No crowbar current | Eliminates supply rail glitches during output transitions - improves system stability in shared power domains |
| Wide supply range | 2V–11V single or ±1V–±5.5V dual - supports Li-ion, alkaline, and regulated 3.3V/5V systems |
| Reference bypass capability | Drives 0.01µF capacitor without oscillation - simplifies noise filtering for critical threshold detection |
Applications
| Battery Voltage Monitor | Low-Power Threshold Detector |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during sleep mode to trigger wake-up at 3.0V cutoff. IC Role / Device Role / Timing Role: Single comparator compares divided battery voltage against internal 1.182V reference; hysteresis prevents oscillation near threshold. Use Value: 2.1µA supply current enables >10-year battery life in coin-cell applications; REF pin drives local bypass cap to reject supply noise. |
Use Scenario: Detecting brown-out condition in a microcontroller-based sensor node powered by 3.3V LDO. IC Role / Device Role / Timing Role: Compares regulated 3.3V rail against scaled-down 1.182V reference to assert reset signal below 2.9V. Use Value: Input common-mode range includes GND, allowing direct connection to LDO output; TTL-compatible OUT drives MCU reset pin without pull-up. |
| Window Comparator | Oscillator Circuit |
Use Scenario: Validating analog sensor output stays within safe operating band (e.g., 1.0V–2.0V) in industrial transmitters. IC Role / Device Role / Timing Role: Two LTC1440IMS8#TRPBF units configured as high/low limit detectors; outputs OR'd to flag out-of-window events. Use Value: Identical reference voltage across both comparators ensures matched thresholds; MSOP-8 footprint minimizes PCB area vs discrete solutions. |
Use Scenario: Building a low-frequency relaxation oscillator for LED blink timing in wearables. IC Role / Device Role / Timing Role: Comparator toggles output when capacitor charges/discharges between hysteresis thresholds set by REF and HYST resistors. Use Value: Programmable hysteresis enables precise frequency control with one external capacitor; 12µs propagation delay ensures predictable timing at sub-1Hz rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower comparator with reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1540IDDB#TRPBF | Nanopower variant: 0.3µA typ ICC; same 1.182V reference; DFN-8 (2mm × 2mm) package | Better suited for ultra-long-life applications (<10nA standby possible); lacks HYST pin - fixed hysteresis only | Select when lowest possible current dominates; avoid if adjustable hysteresis is required |
| LT6700-1HS6#TRMPBF | 0.4V reference; dual comparators; SOT-23-6; 1.4V–18.5V supply; ±2% ref accuracy over temp | Wider supply range and smaller package; lower reference voltage enables low-VCC brown-out detection | Select for sub-2V operation or dual-comparator needs; not drop-in due to different ref voltage and pinout |
Compared with LTC1440IMS8#TRPBF, LTC1540IDDB#TRPBF reduces supply current by >90% but sacrifices hysteresis adjustability, while LT6700-1HS6#TRMPBF offers dual channels and wider supply range but requires redesign for 0.4V reference scaling and SOT-23 layout.
Availability
LTC1440IMS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, ultralow-power threshold detection, and micropower oscillator circuits requiring stable component supply across industrial temperature grades and long-lifecycle production.
Supply support for LTC1440IMS8#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, documentation, and manufacturing continuity for legacy Linear parts including the LTC series.
The LTC1440IMS8#TRPBF belongs to Linear's ultralow-power comparator family designed specifically for energy-constrained applications such as portable medical devices, remote sensors, and battery-backed instrumentation where µA-level quiescent current and integrated reference accuracy are critical.
FAQ
What is the operating temperature range for the LTC1440IMS8#TRPBF?
The LTC1440IMS8#TRPBF is rated for industrial temperature operation from –40°C to +85°C. This is confirmed by the "I" grade designation in the part number and verified in the Absolute Maximum Ratings table, where LTC144XI specifies that range. The device maintains full electrical performance-including 1.182V reference accuracy (±1.2% max over this range) and 4.4µA max supply current-across the entire span.
Can the LTC1440IMS8#TRPBF drive a 0.01µF capacitor directly on its REF pin?
Yes, the LTC1440IMS8#TRPBF REF pin is explicitly characterized to drive up to 0.01µF bypass capacitors without oscillation, as stated in both the Features list and Applications Information section. This capability is enabled by internal compensation and is validated across temperature and supply conditions. Larger capacitors require external damping resistors per Figure 2 in the datasheet.
Does the LTC1440IMS8#TRPBF support dual-supply operation?
Yes, the LTC1440IMS8#TRPBF supports dual-supply operation from ±1V to ±5.5V. Its pinout allows V– to be biased negative relative to GND, and the comparator inputs operate from V– to V+ – 1.3V. The output swings from GND to V+, making it compatible with mixed-signal systems where GND serves as the logic reference even with split analog rails.
What is the maximum hysteresis voltage band achievable with the LTC1440IMS8#TRPBF?
The maximum hysteresis voltage band for the LTC1440IMS8#TRPBF is 100mV total (±50mV around the 1.182V reference), as defined by the HYST pin voltage range of REF – 50mV to REF. This is confirmed in the Electrical Characteristics table (VHYST parameter) and Applications Information section. Exceeding this risks invalid operation or increased offset error.
Is the LTC1440IMS8#TRPBF pin-compatible with MAX921?
Yes, the LTC1440IMS8#TRPBF is explicitly documented as a pin-compatible upgrade for MAX921 (and MAX922/MAX923) in the Features section. Both devices use identical 8-pin SO/MSOP pinouts, share GND/V–/IN+/IN–/HYST/REF/V+/OUT assignments, and offer compatible reference voltage and output drive characteristics-enabling drop-in replacement without PCB changes.
LTC1440IMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
LTC1440IMS8#TRPBF FAQ
1.How can I place an order for LTC1440IMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1440IMS8#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 LTC1440IMS8#TRPBF reliable?
The price and inventory of LTC1440IMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1440IMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1440IMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1440IMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1440IMS8#TRPBF?
LTC1440IMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1440IMS8#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 LTC1440IMS8#TRPBF?
For technical support, including LTC1440IMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1440IMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1440IMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1440IMS8#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 LTC1440IMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1440IMS8#TRPBF?
All LTC1440IMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1440IMS8#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 LTC1440IMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1440IMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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