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Analog Devices Inc. LTC1540CMS8#TRPBF
- Part No.:
- LTC1540CMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1540CMS8#TRPBF.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,511
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Product details
Overview
LTC1540CMS8#TRPBF 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 up to 40mA, and operates from 2V to 11V single supply. It targets battery-powered system monitoring, low-voltage threshold detection, and oscillator circuits where sub-µA quiescent current is critical.
For engineers reviewing the LTC1540CMS8#TRPBF datasheet, LTC1540CMS8#TRPBF pinout, LTC1540CMS8#TRPBF application, or LTC1540CMS8#TRPBF equivalent, key selection factors include its 0.3µA typical supply current at 25°C, 60µs propagation delay with 10mV overdrive, 1.182V reference accuracy, MSOP-8 package footprint, and compatibility with space-constrained, long-life portable instrumentation.
Technical Context
The LTC1540CMS8#TRPBF integrates a rail-to-rail input comparator with common-mode range extending from V– to V+ – 1.3V and a precision bandgap reference referenced to V–. Its HYST pin enables adjustable hysteresis via external resistors, supporting stable switching in noisy environments without external components beyond R1/R2.
It eliminates crowbar current during output transitions, preventing supply glitches, and supports direct driving of 0.01µF bypass capacitors on the REF pin without oscillation-enabling robust reference decoupling in ultra-low-power systems.
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 devices |
| Reference Voltage | 1.182V ±2% (0°C to 70°C) - provides stable trip point for precision threshold detection |
| Propagation Delay | 60µs with 10mV overdrive - balances speed and power for nanopower wake-up logic |
| Output Drive | 40mA source / 5mA sink - directly interfaces with LEDs, MOSFET gates, or logic inputs without buffer |
| Input Offset Voltage | ±12mV max (C-grade MSOP) - ensures reliable decision margin for mV-level signal thresholds |
| Hysteresis Range | 0–100mV programmable - suppresses chatter in slow-moving or noisy analog signals |
| Supply Range | 2V to 11V single supply - supports operation from depleted alkaline/NiCd cells up to industrial rails |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.00mm × 3.00mm × 0.889mm body height, exposed pad optional, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Connect to V– for single-supply operation; separates comparator core ground from output stage |
| V– (Pin 2) | Negative supply | Can be tied to GND (single supply) or driven negative (±1V to ±5.5V dual supply) |
| IN+ (Pin 3) | Noninverting input | Rail-to-rail input stage; 10pA leakage enables high-impedance sensing |
| IN– (Pin 4) | Inverting input | Same input specs as IN+; used with REF for fixed-threshold detection |
| HYST (Pin 5) | Hysteresis control | Accepts 0–50mV below REF to set programmable hysteresis band |
| REF (Pin 6) | Reference output | 1.182V ±2% vs V–; sources 1mA, sinks 10µA; drives 0.01µF capacitor stably |
| V+ (Pin 7) | Positive supply | 2V–11V input; bypassing with 0.1µF recommended if sourcing >1mA |
| OUT (Pin 8) | CMOS output | Swings GND to V+; no crowbar current; 40mA source capability enables direct load drive |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 0.3µA typ ensures >10-year battery life in 20mAh coin cells at 1Hz wake-up rate |
| Integrated 1.182V reference | ±2% accuracy over 0°C–70°C eliminates need for external reference IC or resistor divider |
| Programmable hysteresis | 0–100mV via two external resistors enables noise-immune switching without added comparators |
| No crowbar current | Eliminates supply rail disturbance during output transitions-critical for mixed-signal stability |
| Capacitor-stable reference | Drives up to 0.01µF bypass cap directly-reduces BOM count and PCB area in space-limited designs |
Applications
| Portable Battery Monitoring | Low-Voltage Oscillator |
|---|---|
Use Scenario: Detecting end-of-life voltage in 2-cell NiCd packs (1.6V–2.5V range) for handheld medical sensors. IC Role / Device Role / Timing Role: Nanopower comparator compares battery voltage against internal 1.182V reference scaled by resistor divider. Use Value: Draws only 1.4µA at 2V supply-extends operational lifetime while enabling accurate low-battery warning before cutoff. | Use Scenario: Generating clock signals in energy-harvesting nodes using RC relaxation oscillator topology. IC Role / Device Role / Timing Role: LTC1540CMS8#TRPBF acts as Schmitt trigger with programmable hysteresis to convert RC ramp into square wave. Use Value: 0.3µA supply current and 60µs propagation delay enable sub-1Hz oscillation with <1µA average current consumption. |
| Glitch-Free Level Detector | Auto Power-Off Switch |
Use Scenario: Supervising microcontroller reset line in remote IoT sensor nodes powered by Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Comparator monitors regulated 3.3V rail against 1.182V reference with 15mV hysteresis to prevent false resets. Use Value: Eliminates supply-induced crowbar current-ensures clean reset assertion even during transient load steps. | Use Scenario: Enabling timed power delivery to peripherals (e.g., RF transceiver) in wearable health monitors. IC Role / Device Role / Timing Role: LTC1540CMS8#TRPBF controls MOSFET gate via RC timing network to auto-disable after ~30 seconds. Use Value: Total circuit draws just 0.8µA quiescent current-preserves battery capacity during standby between measurement cycles. |
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#TRPBF | 1.182V ±1% reference, no programmable hysteresis, 10mV max input offset, 1µA supply current | Lacks HYST pin-requires external hysteresis network; higher ICC reduces battery life in ultra-low-duty-cycle apps | Choose when tighter reference accuracy (±1%) outweighs hysteresis flexibility and lowest possible ICC |
| MAX921ESA+ | 1.25V reference, 2.5µA supply current, no HYST pin, SO-8 only, ±2mV offset | Higher ICC and fixed reference limit use in sub-µA systems; no MSOP option restricts board density | Select when legacy MAXIM footprint compatibility or lower input offset is prioritized over power efficiency |
Compared with LTC1440CMS8#TRPBF and MAX921ESA+, the LTC1540CMS8#TRPBF uniquely combines sub-µA ICC, on-chip hysteresis control, and MSOP-8 packaging-making it optimal for new designs demanding minimal power, layout area, and external component count.
Availability
LTC1540CMS8#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, wireless sensor nodes, battery management subsystems, and energy-harvesting controllers requiring stable component supply across extended production lifecycles.
Supply support for LTC1540CMS8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1540CMS8#TRPBF belongs to ADI's legacy Linear Technology nanopower analog portfolio, designed specifically for ultra-low-power sensing, monitoring, and supervisory functions in battery-critical applications.
FAQ
What is the guaranteed operating temperature range for the LTC1540CMS8#TRPBF?
The LTC1540CMS8#TRPBF is rated for the commercial temperature range of 0°C to 70°C. This is confirmed by the "C" grade designation in the part number and specified in the Absolute Maximum Ratings table. The MS8 package variant supports this range, and electrical characteristics-including reference voltage (1.158V to 1.206V) and supply current (0.3µA typ)-are guaranteed across this interval.
Does the LTC1540CMS8#TRPBF require external hysteresis components for stable operation?
No-the LTC1540CMS8#TRPBF includes an internal HYST pin that accepts a voltage 0–50mV below the REF pin to program hysteresis from 0 to 100mV. If hysteresis is not needed, simply tie HYST to REF. External resistors are only required when precise hysteresis values are desired; the device functions reliably without them in basic threshold-detection configurations.
Can the LTC1540CMS8#TRPBF drive a 0.01µF capacitor directly on its REF pin?
Yes-the LTC1540CMS8#TRPBF reference output is explicitly characterized to drive up to 0.01µF capacitors without oscillation. This capability is stated in the Features list, Applications Information section, and Typical Performance Characteristics. For larger capacitors (up to 10µF), a series damping resistor (e.g., 430Ω for 1µF) is required per Figure 1 in the datasheet.
Is the LTC1540CMS8#TRPBF pin-compatible with other comparators in the same family?
Yes-the LTC1540CMS8#TRPBF is pin-compatible with the LTC1440, MAX921, and MAX931 in the MSOP-8 package. This is explicitly stated in the Features section ("Pin Compatible with LTC1440, MAX921, MAX931") and verified by identical pin numbering and function mapping (GND, V–, IN+, IN–, HYST, REF, V+, OUT) across all four devices.
What is the maximum continuous output source current specification for the LTC1540CMS8#TRPBF?
The LTC1540CMS8#TRPBF is specified to continuously source up to 40mA while maintaining nanoscale quiescent current. This value is documented in the Features list, Applications Information section, and Absolute Maximum Ratings (50mA short-circuit, but 40mA is the continuous rating). It applies across the full 0°C–70°C temperature range and supports direct driving of LEDs, small relays, or logic inputs without external buffers.
LTC1540CMS8#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
- :
- 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#TRPBF FAQ
1.How can I place an order for LTC1540CMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1540CMS8#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 LTC1540CMS8#TRPBF reliable?
The price and inventory of LTC1540CMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1540CMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1540CMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1540CMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1540CMS8#TRPBF?
LTC1540CMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1540CMS8#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 LTC1540CMS8#TRPBF?
For technical support, including LTC1540CMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1540CMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1540CMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1540CMS8#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 LTC1540CMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1540CMS8#TRPBF?
All LTC1540CMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1540CMS8#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 LTC1540CMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1540CMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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