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Analog Devices Inc. LTC1440CMS8#TRPBF
- Part No.:
- LTC1440CMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1440CMS8#TRPBF.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,281
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Product details
Overview
LTC1440CMS8#TRPBF from Analog Devices (formerly Linear Technology) is an ultralow-power single comparator with integrated 1.182V ±1% precision reference, programmable hysteresis via HYST pin, TTL/CMOS-compatible output capable of sourcing 40mA, and supply current as low as 2.1µA at 25°C. It operates from a single 2V–11V supply or dual ±1V–±5.5V supply and is used in battery-powered voltage monitoring, micropower threshold detection, and low-glitch level sensing circuits.
For engineers reviewing the LTC1440CMS8#TRPBF datasheet, LTC1440CMS8#TRPBF pinout, LTC1440CMS8#TRPBF application, or LTC1440CMS8#TRPBF equivalent, key selection criteria include guaranteed 2.1µA max quiescent current over temperature, 1.182V reference accuracy across –40°C to +85°C, hysteresis programmability using external resistors, GND-referenced output swing, and MSOP-8 package compatibility with space-constrained portable designs.
Technical Context
The LTC1440CMS8#TRPBF integrates a bandgap reference and a rail-to-rail input comparator in a single die, with separate ground (Pin 1) and negative supply (Pin 2) terminals enabling true split-supply operation. Its input common-mode range extends from V– to V+ – 1.3V, and the reference output drives up to 0.01µF without oscillation-critical for noise-sensitive battery-monitoring applications.
Unlike standard comparators, it eliminates crowbar current during output transitions, preventing supply glitches. The HYST pin allows precise hysteresis control (REF – 50mV to REF), yielding up to 100mV input hysteresis band, while maintaining sub-10nA input leakage and 12µs propagation delay with 10mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 2.1µA typ at 25°C; ensures >10-year battery life in coin-cell–powered systems |
| Reference Voltage | 1.182V ±1% (0°C to 70°C); enables accurate, self-contained threshold generation without external references |
| Input Offset Voltage | ±3mV max over temp; supports reliable detection of small signal differentials (e.g., <10mV) |
| Propagation Delay | 12µs with 10mV overdrive; suitable for slow-varying DC monitoring, not high-speed edge detection |
| Output Drive | Sources 40mA continuously; directly drives LEDs, small relays, or logic inputs without buffer stages |
| Hysteresis Range | 0–100mV input hysteresis band; prevents chatter near trip points in noisy environments |
| Input Leakage | ±0.01nA typ; preserves integrity of high-impedance sensor nodes (e.g., thermistors, photodiodes) |
Pinout & Package
Package: 8-lead MSOP (MS8), 3mm × 3mm footprint, 0.65mm pitch, exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Comparator output stage ground | Must be connected to system ground for single-supply operation; separates output return path from V– |
| V– (Pin 2) | Negative supply rail | Connect to GND for single supply; or to negative rail for ±1V to ±5.5V dual supply |
| IN+ (Pin 3) | Noninverting input | Accepts signals from V– to V+ – 1.3V; 10pA leakage preserves high-Z source integrity |
| IN– (Pin 4) | Inverting input | Same common-mode range as IN+; differential input pairs enable precision window or zero-crossing detection |
| HYST (Pin 5) | Hysteresis control input | Accepts voltage from REF – 50mV to REF; sets hysteresis band via resistor divider |
| REF (Pin 6) | 1.182V reference output | Drives 0.01µF bypass cap directly; sources up to 200µA; referenced to V– |
| V+ (Pin 7) | Positive supply rail | 2V–11V operation; bypass with 0.1µF if sourcing >1mA from output |
| OUT (Pin 8) | CMOS output | Swings GND to V+; sinks 5mA, sources 40mA; no crowbar current minimizes supply noise |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.1µA typ at 25°C enables multi-year operation on CR2032 batteries |
| Integrated 1.182V reference | ±1% accuracy over 0°C–70°C eliminates need for external reference IC or resistor divider |
| Programmable hysteresis | External resistor network on HYST pin provides user-defined noise immunity without redesign |
| No crowbar current | Eliminates supply rail glitches during output transitions-critical for mixed-signal systems |
| Wide supply range | Operates from 2V single supply or ±1V dual supply-supports legacy and ultra-low-VDD designs |
Applications
| Battery Voltage Monitor | Low-Power Threshold Detector |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during sleep mode in wearable health sensors. IC Role / Device Role / Timing Role: Single comparator compares divided battery voltage against internal 1.182V reference to trigger wake-up at 3.0V. Use Value: 2.1µA supply current extends standby time beyond 5 years on a 220mAh coin cell. | Use Scenario: Detecting door-open events in smart lock systems using reed switch closure. IC Role / Device Role / Timing Role: Comparator with 50mV hysteresis rejects EMI-induced false triggers from nearby motors or RF sources. Use Value: HYST pin configuration achieves stable switching without additional op-amps or RC networks. |
| Microcontroller Reset Supervisor | Low-Glitch Level Shifter |
Use Scenario: Generating clean reset pulse when main 3.3V rail drops below 2.9V in industrial controllers. IC Role / Device Role / Timing Role: Reference-driven comparator asserts active-low reset to MCU upon undervoltage condition. Use Value: GND-referenced output directly interfaces with standard CMOS reset inputs; no level translation needed. | Use Scenario: Converting 1.8V logic thresholds to 3.3V domain in battery-powered IoT gateways. IC Role / Device Role / Timing Role: Comparator uses internal reference as trip point, with V+ = 3.3V and input tied to 1.8V GPIO. Use Value: Eliminates external voltage dividers and reduces BOM count while maintaining <10µA total current draw. |
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 |
|---|---|---|---|
| MAX921ESA+ | Higher 10µA supply current; fixed 1.25V reference; no hysteresis pin; SO-8 only | Less suitable for <5µA battery systems; requires external hysteresis circuitry | Choose when cost sensitivity outweighs ultra-low-ICC and hysteresis flexibility |
| LTC1540IDC#TRPBF | 0.3µA supply current; same 1.182V reference; DFN-6 package; no HYST pin | Superior for nanopower use cases but lacks programmable hysteresis and MSOP-8 footprint | Prefer for longest battery life where hysteresis is implemented externally or not required |
Compared with MAX921ESA+ and LTC1540IDC#TRPBF, the LTC1440CMS8#TRPBF uniquely balances ultralow 2.1µA supply current, on-chip hysteresis control, and industry-standard MSOP-8 packaging-making it optimal for space- and power-constrained threshold detection where design simplicity and long service life are critical.
Availability
LTC1440CMS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, ultralow-power threshold detectors, and micropower reset supervisors requiring stable component supply across extended production lifecycles.
Supply support for LTC1440CMS8#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 the LTC portfolio.
The LTC1440 series belongs to Linear's micropower analog signal conditioning family, designed specifically for energy-harvesting, portable medical, and long-life battery-operated instrumentation where minimizing quiescent current without sacrificing reference accuracy or output drive is essential.
FAQ
What is the operating temperature range for the LTC1440CMS8#TRPBF?
The LTC1440CMS8#TRPBF is specified for operation from –40°C to +85°C (I-grade). Its supply current remains ≤4.4µA across this full range, and the 1.182V reference maintains ±1.2% accuracy. This makes LTC1440CMS8#TRPBF suitable for automotive cabin modules, outdoor IoT sensors, and industrial controls exposed to ambient thermal extremes without derating.
Can the LTC1440CMS8#TRPBF drive a 0.01µF capacitor directly on its REF pin?
Yes-the LTC1440CMS8#TRPBF reference output is explicitly characterized to drive up to 0.01µF capacitive loads without oscillation. This capability eliminates the need for external buffering when decoupling the reference for noise-sensitive comparator applications. For larger capacitors (up to 100µF), a series damping resistor (e.g., 10kΩ for 1µF) is required per Figure 1 in the datasheet.
How is hysteresis programmed on the LTC1440CMS8#TRPBF?
Hysteresis is programmed by connecting two external resistors between REF, HYST, and V– pins. The voltage difference between REF and HYST sets the hysteresis band: VHB = 2 × (VREF – VHYST). With VHYST ranging from REF – 50mV to REF, the maximum input hysteresis is 100mV. The LTC1440CMS8#TRPBF datasheet provides exact resistor equations and example circuits (Figures 4 and 5).
Does the LTC1440CMS8#TRPBF support dual-supply operation?
Yes-the LTC1440CMS8#TRPBF supports true dual-supply operation from ±1V to ±5.5V. Pin 2 (V–) serves as the negative rail, Pin 1 (GND) is the output stage ground (tied to V– for dual supply), and Pin 7 (V+) is the positive rail. This configuration enables rail-to-rail input operation and output swing from V– to V+, making LTC1440CMS8#TRPBF compatible with legacy ±5V or ±3.3V systems.
What is the maximum continuous output source current of the LTC1440CMS8#TRPBF?
The LTC1440CMS8#TRPBF output stage can continuously source up to 40mA while maintaining microamp-level quiescent current. This is verified across temperature and supply voltage (2V–11V). The output remains functional even under short-circuit conditions at V+ ≤ 5.5V, supporting direct LED driving, small solenoid actuation, or logic-level translation without external drivers.
LTC1440CMS8#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:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-MSOP
LTC1440CMS8#TRPBF FAQ
1.How can I place an order for LTC1440CMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1440CMS8#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 LTC1440CMS8#TRPBF reliable?
The price and inventory of LTC1440CMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1440CMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1440CMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1440CMS8#TRPBF transactions.
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4.How is shipping managed for LTC1440CMS8#TRPBF?
LTC1440CMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1440CMS8#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 LTC1440CMS8#TRPBF?
For technical support, including LTC1440CMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1440CMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1440CMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1440CMS8#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 LTC1440CMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1440CMS8#TRPBF?
All LTC1440CMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1440CMS8#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 LTC1440CMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1440CMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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