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Analog Devices Inc. LTC1540CMS8#PBF
- Part No.:
- LTC1540CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1540CMS8#PBF.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,415
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Product details
Overview
LTC1540CMS8#PBF from Analog Devices (formerly Linear Technology) is an ultralow-power nanopower comparator with integrated 1.182V ±2% voltage reference, programmable hysteresis, TTL/CMOS-compatible output capable of sourcing 40mA, and operation from 2V to 11V single supply. It delivers 0.3µA typical quiescent current at 25°C and supports battery-powered threshold detection in space-constrained portable instrumentation.
For engineers reviewing the LTC1540CMS8#PBF datasheet, LTC1540CMS8#PBF pinout, LTC1540CMS8#PBF application, or LTC1540CMS8#PBF equivalent, key selection considerations include guaranteed sub-1µA supply current over temperature, reference load capability up to 1mA, input common-mode range extending to V–, and MSOP-8 package compatibility with layout-sensitive low-power designs.
Technical Context
The LTC1540CMS8#PBF integrates a precision bandgap reference and rail-to-rail input comparator in a single die, with separate ground routing for output stage isolation to eliminate crowbar current during logic transitions. Its HYST pin enables resistor-programmable hysteresis up to 100mV total band via REF–HYST differential voltage control.
Input offset voltage is ±12mV (max) over 0°C to 70°C for the CMS8 variant, and the reference maintains ±2.5mV load regulation when sourcing ≤100µA. Propagation delay is 60µs (typ) with 10mV overdrive into 100pF load, and the output swings fully from GND to V+ without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 0.3µA typ at 25°C - enables multi-year battery life in coin-cell–powered systems |
| Reference Voltage | 1.182V ±2% (0°C to 70°C) - stable trip point for precision threshold detection |
| Input Offset Voltage | ±12mV max (C-grade MS8) - ensures accurate decision margin in low-voltage sensing |
| Propagation Delay | 60µs typ (10mV overdrive, 100pF load) - suitable for slow-varying signals like battery voltage monitoring |
| Output Drive | 40mA continuous source / 5mA sink - directly drives LEDs, small relays, or logic inputs without buffer |
| Hysteresis Range | 0 to 100mV total band - prevents chatter on noisy inputs using two external resistors |
| Supply Range | 2V to 11V single supply - operates across primary and secondary battery chemistries |
| Input Common-Mode | V– to V+ – 1.3V - supports ground-referenced sensing and wide dynamic range |
Pinout & Package
The LTC1540CMS8#PBF is housed in an 8-lead plastic MSOP (MS8) package measuring 3.00mm × 3.00mm × 0.889mm, with exposed pad connected to V– for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference for comparator core | Must be tied to V– for single-supply operation; separates analog ground from output stage return |
| V– (Pin 2) | Negative supply terminal | Accepts voltages ≤ GND; enables split-supply operation down to ±1V; underside metal connects to this pin |
| IN+ (Pin 3) | Noninverting comparator input | Operates from V– to V+ – 1.3V; leakage < ±0.01nA enables high-impedance sensor interfacing |
| IN– (Pin 4) | Inverting comparator input | Same common-mode range as IN+; matched offset and CMRR support differential sensing |
| HYST (Pin 5) | Hysteresis control input | Voltage set between REF – 50mV and REF; defines hysteresis band width via resistor divider |
| REF (Pin 6) | 1.182V reference output | Sources up to 1mA; drives 0.01µF bypass cap without oscillation; ±2% accuracy over commercial temp range |
| V+ (Pin 7) | Positive supply input | Supports 2V–11V range; requires 0.1µF bypass if output sourcing >1mA or supply impedance is high |
| OUT (Pin 8) | CMOS push-pull output | Swings rail-to-rail (GND to V+); no external pull-up needed; eliminates supply glitches during switching |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 0.3µA typ at 25°C - extends shelf life and runtime in always-on monitoring circuits |
| Integrated precision reference | 1.182V ±2% over 0°C to 70°C - eliminates external reference IC and associated BOM cost |
| Programmable hysteresis | 0–100mV band via two resistors - configurable noise immunity without changing comparator IC |
| No crowbar current | Eliminated cross-conducting current during output transitions - prevents supply rail disturbance in sensitive analog systems |
| Wide supply voltage range | 2V to 11V single supply - interoperable with Li-ion, alkaline, NiMH, and regulated 3.3V/5V rails |
| TTL/CMOS compatible output | Rail-to-rail swing with 40mA source capability - directly interfaces with microcontroller GPIO or logic gates |
Applications
| Battery-Powered System Monitoring | Threshold Detectors |
|---|---|
Use Scenario: Continuous monitoring of lithium coin-cell voltage in medical wearables to trigger shutdown before deep discharge. IC Role / Device Role / Timing Role: Nanopower comparator compares battery voltage against internal 1.182V reference scaled by resistor divider to detect <2.7V condition. Use Value: 0.3µA supply current extends usable battery life beyond 5 years; hysteresis prevents false wakeups from transient load spikes. | Use Scenario: Detecting end-of-charge voltage in solar-charged NiCd battery packs for automatic charge termination. IC Role / Device Role / Timing Role: Reference-driven comparator triggers cutoff when cell voltage exceeds 1.45V per cell, using REF pin and external resistive scaling. Use Value: Integrated 1.182V reference eliminates calibration drift vs. external references; ±12mV VOS ensures consistent 50mV hysteresis window. |
| Window Comparators | Oscillator Circuits |
Use Scenario: Validating sensor output stays within safe operating bounds in industrial temperature transmitters. IC Role / Device Role / Timing Role: Two LTC1540CMS8#PBF units configured as high/low limit detectors with shared REF; outputs feed AND gate for in-window indication. Use Value: Identical reference voltage across both comparators ensures matched thresholds; MSOP-8 footprint minimizes PCB area in multi-channel modules. | Use Scenario: Generating low-frequency clock signals in ultra-low-power data loggers using relaxation oscillator topology. IC Role / Device Role / Timing Role: Comparator with capacitor feedback and hysteresis forms astable multivibrator; REF pin sets center voltage, HYST pin controls frequency via RC time constant. Use Value: 60µs propagation delay enables stable oscillation down to ~10Hz; 0.3µA ICC permits duty-cycled operation with average current <100nA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanopower comparator with reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1440CMS8#PBF | 1.182V ±1% reference; no programmable hysteresis; 10mV max input offset; 1.1µA ICC (typ) | Fixed hysteresis only; higher supply current limits battery lifetime in long-duration deployments | Select when tighter reference accuracy (±1%) outweighs need for adjustable hysteresis and lowest possible ICC |
| MAX921ESA+ | 1.235V reference; no hysteresis pin; 1.5µA ICC (typ); SO-8 only; ±2mV VOS | Lacks HYST pin and MSOP option; higher ICC reduces energy efficiency in micropower systems | Choose for applications requiring lower input offset voltage where reference voltage tolerance and package flexibility are secondary |
Compared with LTC1540CMS8#PBF, LTC1440CMS8#PBF offers superior reference accuracy but lacks hysteresis adjustability and draws >3× more supply current; MAX921ESA+ provides lower offset voltage but sacrifices programmable hysteresis, nanopower operation, and MSOP packaging - making LTC1540CMS8#PBF optimal for space-constrained, battery-limited designs requiring configurable noise immunity.
Availability
LTC1540CMS8#PBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, threshold detection, window comparator circuits, and oscillator designs requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1540CMS8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1540 belongs to ADI's nanopower precision analog product line, designed specifically for ultra-low-energy sensing, battery longevity optimization, and compact portable instrumentation where sub-microamp operation and integrated reference stability are critical.
FAQ
What is the guaranteed supply current specification for LTC1540CMS8#PBF over temperature?
The LTC1540CMS8#PBF guarantees 0.71µA maximum supply current (ICC) over the full 0°C to 70°C commercial temperature range, with 0.3µA typical at 25°C. This specification applies under standard test conditions (IN– – IN+ = 80mV, HYST = REF) and ensures predictable battery drain in long-life applications.
Can LTC1540CMS8#PBF drive a 0.01µF capacitor directly from its REF pin without instability?
Yes, the LTC1540CMS8#PBF REF pin is explicitly characterized to drive up to 0.01µF capacitive loads without oscillation. This capability is confirmed in the datasheet's Applications Information section and Typical Performance Characteristics, enabling robust bypassing for noise-sensitive threshold detection circuits.
What is the absolute maximum voltage rating for the IN+, IN–, and HYST pins of LTC1540CMS8#PBF?
The absolute maximum voltage rating for IN+, IN–, and HYST pins of LTC1540CMS8#PBF is (V+ + 0.3V) to (V– – 0.3V). Exceeding these limits risks permanent device damage, as stated in the Absolute Maximum Ratings table. Input common-mode range during normal operation is specified as V– to V+ – 1.3V.
Does LTC1540CMS8#PBF support dual-supply operation, and what are the limits?
Yes, LTC1540CMS8#PBF supports dual-supply operation from ±1V to ±5.5V. The V+ and V– pins accept symmetric or asymmetric supplies, with GND connected to the comparator core ground (Pin 1). This configuration enables true bipolar input sensing while maintaining nanoscale quiescent current.
Is LTC1540CMS8#PBF pin-compatible with other members of the LTC1540 family, such as the DFN and SO-8 variants?
Yes, LTC1540CMS8#PBF shares identical pinout and functionality with LTC1540CDD#PBF (DFN) and LTC1540CS8#PBF (SO-8), as confirmed in the Pin Configuration diagrams and Order Information table. All variants use the same 8-pin assignment: GND, V–, IN+, IN–, HYST, REF, V+, OUT.
LTC1540CMS8#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
- :
- 12mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 680nA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 60µs
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-MSOP
LTC1540CMS8#PBF FAQ
1.How can I place an order for LTC1540CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1540CMS8#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 LTC1540CMS8#PBF reliable?
The price and inventory of LTC1540CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1540CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1540CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1540CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1540CMS8#PBF?
LTC1540CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1540CMS8#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 LTC1540CMS8#PBF?
For technical support, including LTC1540CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1540CMS8#PBF requirements.
6.How does Aetrix verify that LTC1540CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1540CMS8#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 LTC1540CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1540CMS8#PBF?
All LTC1540CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1540CMS8#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 LTC1540CMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1540CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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