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Analog Devices Inc. LTC1540IDD#TRPBF
- Part No.:
- LTC1540IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC1540IDD#TRPBF.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:11,440
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Product details
Overview
LTC1540IDD#TRPBF from Analog Devices (formerly Linear Technology) is an ultralow-power nanopower comparator with integrated 1.182V ±2% voltage reference, designed for battery-critical monitoring functions. It delivers 0.68µA typical supply current at –40°C to +85°C, supports 2V–11V single-supply operation, features programmable hysteresis via the HYST pin, and drives up to 0.01µF bypass capacitors without oscillation - enabling reliable low-voltage threshold detection in portable medical sensors.
For engineers reviewing the LTC1540IDD#TRPBF datasheet, LTC1540IDD#TRPBF pinout, LTC1540IDD#TRPBF application, or LTC1540IDD#TRPBF equivalent, key selection criteria include guaranteed sub-1µA quiescent current over industrial temperature, rail-to-rail input range (V– to V+ – 1.3V), CMOS/TTL-compatible output sourcing 40mA, and DFN-8 package compatibility with space-constrained wearable designs.
Technical Context
The LTC1540IDD#TRPBF integrates a precision bandgap reference and comparator on a single die, with separate ground (GND) and negative supply (V–) pins enabling true split-supply operation (±1V to ±5.5V) or robust single-supply use. Its input stage uses p-channel MOSFETs to achieve ±10pA typical input leakage and common-mode range extending to the negative rail.
Hysteresis is implemented externally via two resistors between REF and HYST pins, allowing precise control of the 100mV maximum hysteresis voltage band (±15% variation). The output stage eliminates crowbar current during transitions, preventing supply glitches - critical for noise-sensitive analog front-ends in energy-harvesting systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 0.68µA typ at –40°C to +85°C; enables >10-year battery life in coin-cell-powered IoT nodes |
| Reference Voltage | 1.182V ±2% over temperature; stable bias source for precision threshold setting |
| Input Common-Mode Range | V– to V+ – 1.3V; supports direct sensing of signals near ground in single-supply systems |
| Propagation Delay | 60µs with 10mV overdrive; sufficient for slow-varying battery voltage monitoring |
| Output Drive | 40mA continuous source / 5mA sink; directly drives LEDs, small relays, or logic inputs without buffering |
| Hysteresis Range | 0–100mV programmable; prevents chatter in noisy environments like motor-driven equipment |
| Max Bypass Cap | 0.01µF on REF pin without oscillation; simplifies power supply rejection in compact layouts |
Pinout & Package
Package: 8-lead (3mm × 3mm × 0.8mm) plastic DFN with underside metal pad connected to V–; suitable for high-density PCBs with thermal constraints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Comparator output stage ground | Separate from V–; allows independent grounding of output load to reduce noise coupling |
| V– (Pin 2) | Negative supply rail | Connected to GND for single supply; enables ±1V to ±5.5V dual supply operation |
| IN+ (Pin 3) | Noninverting comparator input | Accepts voltages from V– to V+ – 1.3V; ±10pA leakage preserves ultra-low power integrity |
| IN– (Pin 4) | Inverting comparator input | Same common-mode range as IN+; used with resistor dividers for precise threshold detection |
| HYST (Pin 5) | Hysteresis control input | Accepts voltage from REF – 50mV to REF; sets hysteresis band via external resistor network |
| REF (Pin 6) | 1.182V reference output | Sources up to 1mA; drives 0.01µF capacitor directly; referenced to V– |
| V+ (Pin 7) | Positive supply rail | Operates from 2V to 11V; bypassing with 0.1µF recommended for >1mA output loads |
| OUT (Pin 8) | CMOS/TTL-compatible output | Swings from GND to V+; no crowbar current ensures clean switching in shared supply rails |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 0.68µA typ over –40°C to +85°C - extends shelf life and runtime in sealed battery devices |
| Integrated reference accuracy | 1.182V ±2% over full industrial temperature - eliminates need for external precision reference |
| No crowbar current | Eliminates supply rail transients during output transitions - improves system-level EMI performance |
| Programmable hysteresis | 0–100mV via two external resistors - enables robust detection in electrically noisy industrial controls |
| Wide supply voltage range | 2V to 11V single supply or ±1V to ±5.5V dual supply - supports legacy and emerging low-voltage platforms |
Applications
| Low-Battery Detection | Glitch-Free Level Detector |
|---|---|
Use Scenario: Monitoring 2-cell NiCd battery voltage (1.6V–2.5V) in portable diagnostic tools with no access for battery replacement. IC Role / Device Role / Timing Role: Comparator compares divided battery voltage against internal 1.182V reference to assert LBO signal below 1.8V. Use Value: Draws only 1.4µA at 2V supply - preserves battery capacity for >5 years in standby mode. | Use Scenario: Detecting voltage thresholds in HVAC sensor nodes exposed to EMI from compressors and fans. IC Role / Device Role / Timing Role: Configured with 60mV hysteresis to prevent false triggering during motor startup transients. Use Value: Eliminates crowbar current-induced supply glitches that previously corrupted ADC readings. |
| Auto Power-Off Switch | Nanopower Field Detector |
Use Scenario: Enabling timed power delivery to BLE radio modules in asset trackers after button press. IC Role / Device Role / Timing Role: Drives MOSFET gate via RC-timed hysteresis circuit; OUT pin acts as switched 5V rail. Use Value: Total circuit quiescent current = 0.8µA - achieves >3-year shelf life on CR2032 cell. | Use Scenario: RF field presence detection at 445MHz in wireless security perimeter sensors. IC Role / Device Role / Timing Role: Compares rectified RF envelope (via 1N5712 diode) against 18mV threshold set by REF/IN– divider. Use Value: Total supply current = 400nA - enables multi-year operation on energy-harvested RF power. |
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 |
|---|---|---|---|
| LTC1440CS8#TRPBF | 1.182V ±1% reference; no programmable hysteresis; 0.9µA supply current (C-grade) | Limited to fixed-threshold detection; less suitable for noisy environments requiring hysteresis | Select when ±1% reference accuracy is mandatory and hysteresis is not required. |
| MAX921ESA+ | 1.235V reference; 1.5µA supply current; open-drain output; no REF drive capability | Requires external pull-up and reference buffer; incompatible with direct 0.01µF REF bypass | Select for cost-sensitive designs where external components are acceptable and lower accuracy suffices. |
Compared with LTC1440CS8#TRPBF and MAX921ESA+, the LTC1540IDD#TRPBF uniquely combines programmable hysteresis, sub-1µA industrial-grade supply current, and direct 0.01µF REF drive - making it optimal for battery-powered systems demanding both precision and noise immunity in minimal footprint.
Availability
LTC1540IDD#TRPBF is available at Aetrix Electronics and suitable for low-power sensor nodes, portable medical monitors, and industrial battery management systems requiring stable component supply across extended temperature ranges.
Supply support for LTC1540IDD#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 semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1540 belongs to ADI's nanopower precision analog product line, engineered specifically for ultra-long-life battery-operated applications including wearables, remote sensors, and energy-harvesting systems where µA-level supply current and integrated reference stability are critical.
FAQ
What is the guaranteed minimum supply voltage for reliable operation of the LTC1540IDD#TRPBF?
The LTC1540IDD#TRPBF is specified to operate down to 2V supply voltage over its full –40°C to +85°C industrial temperature range. While functional at 1.6V in some conditions, parameters including VREF accuracy, propagation delay, and input offset voltage degrade below 2V - so designs requiring guaranteed specifications must maintain V+ ≥ 2V. The LTC1540IDD#TRPBF datasheet explicitly states 2V as the absolute minimum rated supply.
Can the LTC1540IDD#TRPBF drive a 10µF capacitor on its REF pin?
The LTC1540IDD#TRPBF can drive up to 0.01µF directly on the REF pin without oscillation. For larger capacitors such as 10µF, a series damping resistor is required - Figure 1 in the LTC1540IDD#TRPBF datasheet shows R1 values versus C1; for 10µF, a ~1kΩ resistor is recommended. Without this resistor, instability and reference voltage droop will occur. The LTC1540IDD#TRPBF reference output is not designed for direct 10µF connection.
Is the LTC1540IDD#TRPBF pin-compatible with the LTC1440 series?
Yes, the LTC1540IDD#TRPBF is pin-compatible with the LTC1440 in all package variants (DFN, SO, MSOP), as confirmed in the "Pin Compatible with LTC1440" feature list and identical pin numbering across datasheet diagrams. However, the LTC1540IDD#TRPBF adds programmable hysteresis and improved supply current vs. temperature - meaning it can be a drop-in upgrade where hysteresis is needed, but layout changes may be required if leveraging the HYST pin functionality.
What is the maximum continuous output source current of the LTC1540IDD#TRPBF?
The LTC1540IDD#TRPBF output stage is rated for 40mA continuous source current into a load tied to GND, as specified in both the Absolute Maximum Ratings and Electrical Characteristics tables. This applies across the full industrial temperature range and is validated with V+ = 5V. Sustained operation near this limit requires adequate PCB copper area for thermal dissipation, especially in the DFN package where θJA = 160°C/W with minimal heat spreading.
Does the LTC1540IDD#TRPBF support dual-supply operation, and what are the limits?
Yes, the LTC1540IDD#TRPBF supports true dual-supply operation from ±1V to ±5.5V, enabled by separate V– and GND pins. In dual-supply mode, V– serves as the negative rail, GND as the output stage reference, and V+ as the positive rail. Input common-mode range extends from V– to V+ – 1.3V, and the reference remains referenced to V–. This configuration is explicitly validated in the datasheet's Applications Information section and enables bipolar signal monitoring in instrumentation amplifiers and sensor interfaces.
LTC1540IDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-WFDFN Exposed Pad
- 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-DFN (3x3)
LTC1540IDD#TRPBF FAQ
1.How can I place an order for LTC1540IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1540IDD#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 LTC1540IDD#TRPBF reliable?
The price and inventory of LTC1540IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1540IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1540IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1540IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1540IDD#TRPBF?
LTC1540IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1540IDD#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 LTC1540IDD#TRPBF?
For technical support, including LTC1540IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1540IDD#TRPBF requirements.
6.How does Aetrix verify that LTC1540IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1540IDD#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 LTC1540IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1540IDD#TRPBF?
All LTC1540IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1540IDD#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 LTC1540IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC1540IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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