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Analog Devices Inc. LTC1540IMS8#TRPBF
- Part No.:
- LTC1540IMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1540IMS8#TRPBF.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC1540IMS8#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 40mA, and operation from 2V to 11V single supply. It delivers 0.61µA typical supply current at –40°C to +85°C, supports input common-mode range from V– to V+ – 1.3V, and drives up to 0.01µF bypass capacitors on the REF pin without oscillation - ideal for battery-powered threshold detection in portable instrumentation.
For engineers reviewing the LTC1540IMS8#TRPBF datasheet, LTC1540IMS8#TRPBF pinout, LTC1540IMS8#TRPBF application, or LTC1540IMS8#TRPBF equivalent, key selection criteria include guaranteed sub-1µA quiescent current over industrial temperature, ±15mV max input offset voltage (LTC1540IMS8), 60µs propagation delay with 10mV overdrive, MSOP-8 package compatibility, and direct replacement capability with LTC1440 in hysteresis-configured detector circuits.
Technical Context
The LTC1540IMS8#TRPBF integrates a precision bandgap reference and rail-to-rail input comparator in a single die, with separate GND and V– pins enabling true split-supply operation (±1V to ±5.5V) or robust single-supply use. Its HYST pin accepts a voltage from REF – 50mV to REF, allowing resistor-programmed hysteresis up to 100mV total band width.
Input leakage is ±0.01nA (typ) at 25°C, CMRR and PSRR are both ≥0.1 mV/V, and the output stage eliminates crowbar current during logic transitions - preventing supply glitches that degrade system-level noise immunity in sensitive analog monitoring paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 0.61µA typ at –40°C to +85°C; enables >10-year battery life in coin-cell–powered wake-up circuits. |
| Reference Voltage | 1.182V ±2% over temperature; stable enough to eliminate external references in low-cost voltage threshold designs. |
| Input Offset Voltage | ±15mV max over full industrial range; ensures reliable 20mV-level detection margins without calibration. |
| Propagation Delay | 60µs with 10mV overdrive; sufficient for slow-varying signals like battery voltage decay or temperature ramp monitoring. |
| Output Drive | 40mA continuous source / 5mA sink; directly drives LEDs, small relays, or logic inputs without buffer stages. |
| Input Common-Mode Range | V– to V+ – 1.3V; supports ground-referenced sensing even at 2V supply, critical for Li-ion cell monitoring. |
| Hysteresis Range | 0 to 100mV programmable via two external resistors; prevents chatter near trip points in noisy environments. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.00mm × 3.00mm × 1.10mm body height, exposed pad optional, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference for comparator output stage | Must connect to system ground; separates output return path from V– to avoid ground bounce in high-current switching. |
| V– (Pin 2) | Negative supply terminal | Connect to GND for single supply; allows true dual-supply operation down to ±1V when biased negatively. |
| IN+ (Pin 3) | Noninverting comparator input | Accepts signals from V– to V+ – 1.3V; 10pA typical leakage preserves high-impedance sensor node integrity. |
| IN– (Pin 4) | Inverting comparator input | Matches IN+ specs; used with resistor dividers for precise threshold setting against internal reference. |
| HYST (Pin 5) | Hysteresis control input | Voltage between REF – 50mV and REF sets hysteresis band; open-circuit defaults to REF (no hysteresis). |
| REF (Pin 6) | 1.182V reference output | Sources up to 1mA; drives 0.01µF capacitor directly; sinking up to 10µA maintains regulation under light loads. |
| V+ (Pin 7) | Positive supply input | 2V to 11V operation; bypassing with 0.1µF improves transient rejection when sourcing >1mA from OUT. |
| OUT (Pin 8) | CMOS-compatible comparator output | Rail-to-rail swing (GND to V+); no crowbar current during transition; 40mA source enables direct LED drive. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 0.61µA typ over –40°C to +85°C enables decade-scale operation on CR2032 batteries. |
| Integrated 1.182V reference | ±2% accuracy over temperature eliminates need for external reference ICs or precision resistors in basic threshold detectors. |
| Programmable hysteresis | 0–100mV band via two resistors; avoids false triggering in EMI-prone industrial sensor interfaces. |
| No crowbar current | Eliminates supply rail disturbance during output transitions - critical for mixed-signal systems sharing power rails. |
| Wide supply range | 2V to 11V single supply or ±1V to ±5.5V dual supply supports legacy and modern battery chemistries alike. |
Applications
| Battery Voltage Monitor | Low-Power Wake-Up Detector |
|---|---|
|
Use Scenario: Monitoring 2-cell NiCd battery (1.6V–2.5V) to trigger shutdown before deep discharge. IC Role / Device Role / Timing Role: Comparator compares divided battery voltage against internal 1.182V reference; hysteresis prevents oscillation near cutoff. Use Value: Draws only 1.4µA at 2V supply (per Figure 9), extending usable battery life by >30% versus discrete solutions. |
Use Scenario: Detecting RF field presence at 445MHz using diode detector feeding into comparator input. IC Role / Device Role / Timing Role: Nanopower comparator acts as DC threshold detector for rectified RF envelope; triggers one-shot pulse generator. Use Value: Total circuit draws just 400nA (Figure 10), enabling always-on wireless presence sensing in energy-harvested nodes. |
| Auto Power-Off Switch | Glitch-Free Level Detector |
|
Use Scenario: Timed power delivery for microcontroller peripherals after momentary switch press. IC Role / Device Role / Timing Role: Comparator output controls MOSFET switch; RC network on IN+ sets auto-shutdown timeout (~4.6RC). Use Value: Quiescent current only 0.8µA at 5V (Figure 8), permitting months of standby without maintenance. |
Use Scenario: Detecting supply rail transients (e.g., 5V → 8V step) to prevent false resets in embedded systems. IC Role / Device Role / Timing Role: REF pin bypassed with R+C; comparator monitors V+ via resistive divider while rejecting supply noise. Use Value: Propagation delay remains stable under 10mV overdrive; eliminates false trips caused by µs-scale supply glitches. |
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; ±10mV max VOS; no HYST pin - fixed hysteresis only. | Lacks programmable hysteresis; requires external resistor network for adjustable thresholds. | Choose when tighter reference accuracy (±1%) and lower offset (±10mV) outweigh need for hysteresis flexibility. |
| MAX921ESA+ | 1.235V reference; 1.5µA supply current at +25°C; SO-8 only; no HYST pin. | Higher quiescent current limits battery life; no hysteresis control; not rated for industrial temperature range. | Use only in commercial-temp, non-battery-critical applications where cost is primary constraint. |
Compared with LTC1440CMS8#TRPBF and MAX921ESA+, the LTC1540IMS8#TRPBF uniquely combines programmable hysteresis, industrial temperature rating, sub-1µA supply current across full range, and MSOP-8 footprint - making it the sole option for precision, long-life, noise-immune threshold detection in harsh environments.
Availability
LTC1540IMS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, low-power wake-up detection, auto power-off switches, and glitch-free level detection requiring stable component supply across industrial temperature grades.
Supply support for LTC1540IMS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1540IMS8#TRPBF belongs to Linear's nanopower comparator family, designed specifically for ultra-low-energy sensing, battery health monitoring, and always-on event detection in portable and remote IoT endpoints.
FAQ
What is the maximum bypass capacitance the REF pin of LTC1540IMS8#TRPBF can drive without oscillation?
The REF pin of LTC1540IMS8#TRPBF can directly drive up to 0.01µF (10nF) without oscillation, as confirmed in the Applications Information section and Typical Performance Characteristics. For larger capacitors (up to 10µF), a series damping resistor must be added per Figure 1 and Figure 2 in the datasheet. This capability eliminates need for external reference buffers in space-constrained designs.
Does LTC1540IMS8#TRPBF support true dual-supply operation, and what are the voltage limits?
Yes, LTC1540IMS8#TRPBF supports true dual-supply operation from ±1V to ±5.5V, enabled by separate V– and GND pins. Absolute maximum ratings allow V+ to V– differential up to 12V, and input pins tolerate (V+ + 0.3V) to (V– – 0.3V). This architecture permits rail-splitting configurations and robust interfacing with bipolar sensor outputs.
What is the guaranteed input offset voltage specification for LTC1540IMS8#TRPBF over its full operating temperature range?
The guaranteed input offset voltage for LTC1540IMS8#TRPBF is ±15mV over the full industrial temperature range (–40°C to +85°C), as specified in the Electrical Characteristics table for the IMS8 variant. This value is tighter than the ±16mV limit for DFN/SO packages and reflects process optimization for the MSOP-8 industrial-grade version.
Can LTC1540IMS8#TRPBF be used as a low-dropout linear regulator, and if so, what is its quiescent current in that configuration?
Yes, LTC1540IMS8#TRPBF can be configured as a micropower LDO regulator, as shown in Figure 7 of the datasheet. In this topology, it achieves 5.5µA quiescent current at VIN = 5V while delivering a regulated 3.3V output. The design leverages the comparator's output drive and internal reference to form a feedback-controlled current source, suitable for ultra-low-power auxiliary rails.
Is LTC1540IMS8#TRPBF pin-compatible with LTC1440, and what design changes are needed for substitution?
LTC1540IMS8#TRPBF is pin-compatible with LTC1440 in MSOP-8 packages, sharing identical pinout (GND, V–, IN+, IN–, HYST/NC, REF, V+, OUT). However, LTC1440 lacks a functional HYST pin (tied internally), so circuits using programmable hysteresis with LTC1540IMS8#TRPBF must either remove the HYST resistor network or tie HYST to REF to match LTC1440 behavior.
LTC1540IMS8#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):
- 710nA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 60µs
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-MSOP
LTC1540IMS8#TRPBF FAQ
1.How can I place an order for LTC1540IMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1540IMS8#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 LTC1540IMS8#TRPBF reliable?
The price and inventory of LTC1540IMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1540IMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1540IMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1540IMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1540IMS8#TRPBF?
LTC1540IMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1540IMS8#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 LTC1540IMS8#TRPBF?
For technical support, including LTC1540IMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1540IMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1540IMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1540IMS8#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 LTC1540IMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1540IMS8#TRPBF?
All LTC1540IMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1540IMS8#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 LTC1540IMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1540IMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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