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Analog Devices Inc. LTC1541CS8#PBF
- Part No.:
- LTC1541CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Amplifiers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1541CS8#PBF.pdf
- Description:
- IC AMP COMP REF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:685
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Product details
Overview
LTC1541CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower integrated circuit combining a rail-to-rail op amp, comparator, and 1.2V ±1% bandgap reference in a single SO-8 package. It operates from 2.5V to 12.6V single supply with 5µA typical quiescent current, features 12kHz gain-bandwidth, ±2.25mV comparator hysteresis, and drives up to 1000pF capacitive load - ideal for low-power battery monitoring and sensor interface circuits.
For engineers reviewing the LTC1541CS8#PBF datasheet, LTC1541CS8#PBF pinout, LTC1541CS8#PBF application, or LTC1541CS8#PBF equivalent, key selection criteria include its 5µA supply current, 1.2V reference accuracy over –40°C to 85°C, rail-to-rail output swing, input common-mode range extending to VSS, and compatibility with bypass capacitors up to 0.01µF without oscillation.
Technical Context
The LTC1541CS8#PBF integrates three functional blocks on one die: a unity-gain-stable CMOS op amp (GBW = 12kHz, slew rate = 8V/ms), a comparator with internal hysteresis and rail-to-rail CMOS output (20mA source / 5mA sink), and a buffered 1.2V reference (±1% over temperature, 2mA source capability). The comparator's inverting input is internally tied to the reference output - a defining architecture of the LTC1541 variant.
This configuration enables self-contained threshold detection without external reference components. Its input common-mode range spans from VSS to VCC – 1.3V, and both op amp and comparator inputs exhibit ≤1nA bias current, supporting high-impedance sensor interfacing in ultra-low-power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 12.6V single supply - supports wide-input battery-powered systems including 3.6V Li-ion and 9V alkaline stacks. |
| Quiescent Current | 5µA typical - enables multi-year operation from coin cells or energy-harvesting sources. |
| Reference Voltage | 1.200V ±1% (–40°C to 85°C) - provides stable, factory-trimmed threshold for precision comparators without external components. |
| Op Amp GBW | 12kHz - sufficient for DC-coupled sensor amplification and slow control loops, not RF or audio. |
| Comparator Hysteresis | ±2.25mV - prevents chatter on noisy or slowly ramping inputs like thermistor outputs or battery voltage ramps. |
| Capacitive Load Drive | Up to 1000pF - allows direct connection to ADC sample capacitors or filtering networks without external isolation. |
| Input Bias Current | ≤1nA max - preserves signal integrity when interfacing with high-Z sources such as photodiodes or pH electrodes. |
Pinout & Package
Package: 8-lead plastic SO (narrow, 0.150-inch width), RoHS-compliant, lead-free (PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AMPOUT) | Op Amp Output | Rail-to-rail output capable of sourcing/sinking ≥0.7mA; stable with 1000pF loads. |
| 2 (AMPIN–) | Op Amp Inverting Input | CMOS input with ≤1nA bias current; common-mode range extends to VSS. |
| 3 (AMPIN+) | Op Amp Noninverting Input | CMOS input matching AMPIN–; supports ground-referenced sensing. |
| 4 (VSS) | Negative Supply / Ground | Reference node for all analog blocks; must be low-impedance for stability. |
| 5 (COMPIN+) | Comparator Noninverting Input | Differential input referenced to internal 1.2V; accepts signals from VSS to VCC – 1.3V. |
| 6 (REF) | Reference Output (LTC1541 only) | 1.2V ±1% output; internally connected to COMPIN–; drives 0.01µF bypass caps stably. |
| 7 (COMPOUT) | Comparator Output | CMOS push-pull output; rail-to-rail swing; sinks 5mA / sources 20mA. |
| 8 (VCC) | Positive Supply | Accepts 2.5V–12.6V; bypassing with 0.1µF capacitor recommended for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 5µA supply current enables >10-year battery life in smoke detectors and remote sensors. |
| Integrated 1.2V reference | Eliminates need for external reference IC or resistor divider, reducing BOM count and layout area. |
| Rail-to-rail op amp output | Maximizes dynamic range in single-supply systems, e.g., 0–5V ADC interfacing with no level-shifting. |
| Comparator with internal hysteresis | ±2.25mV hysteresis ensures glitch-free switching on slow-moving inputs like thermistor voltage ramps. |
| Stable with 1000pF capacitive load | Enables direct driving of ADC input capacitors or RC filters without added series resistance. |
Applications
| Battery Monitoring | Smoke Detector Interface |
|---|---|
Use Scenario: Monitoring lithium-ion cell voltage during charge/discharge cycles in portable medical devices. IC Role / Device Role / Timing Role: LTC1541CS8#PBF compares cell voltage against 1.2V reference scaled by resistive divider to trigger low-battery warning. Use Value: 5µA quiescent current minimizes standby drain; internal reference ensures consistent trip point across temperature. | Use Scenario: Detecting ionization chamber current drop indicating smoke presence in residential alarms. IC Role / Device Role / Timing Role: LTC1541CS8#PBF op amp amplifies picoamp-level chamber current; comparator triggers alarm when output crosses reference-derived threshold. Use Value: ≤1nA input bias avoids measurement error; rail-to-rail output directly drives buzzer driver transistor. |
| Infrared Remote Receiver | Solar-Powered Sensor Node |
Use Scenario: Demodulating 38kHz IR carrier pulses in TV remote receivers powered by button cells. IC Role / Device Role / Timing Role: LTC1541CS8#PBF op amp amplifies weak photodiode signal; comparator with hysteresis cleans up noisy demodulated output. Use Value: ±2.25mV hysteresis rejects EMI-induced glitches; 12kHz bandwidth passes modulated envelope while rejecting carrier. | Use Scenario: Conditioning and thresholding output of a solar irradiance sensor in off-grid environmental monitors. IC Role / Device Role / Timing Role: LTC1541CS8#PBF op amp buffers photovoltaic cell output; comparator asserts wake-up signal when light exceeds preset level. Use Value: 2.5V minimum supply allows operation directly from small solar panels; 1.2V reference provides stable, temperature-compensated threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower op amp + comparator + reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX951ESA+ | Single-supply micropower comparator with internal 1.25V reference; no integrated op amp. | Requires external op amp for sensor amplification; higher reference tolerance (±2%) and lower drive strength (1mA source). | Select when only comparator + reference is needed and board space permits discrete op amp addition. |
| LT1635CS8#PBF | Includes micropower op amp and 1.25V reference but no comparator; 130µA supply current vs. 5µA. | Cannot perform autonomous threshold detection; requires external comparator or µC GPIO polling. | Select when precision op amp performance (1.3mV VOS) is prioritized over ultra-low power and integrated decision logic. |
Compared with MAX951ESA+ and LT1635CS8#PBF, the LTC1541CS8#PBF uniquely delivers op amp, comparator, and reference in one 5µA device - enabling fully autonomous, battery-life-optimized sensing without external active components or firmware intervention.
Availability
LTC1541CS8#PBF is available at Aetrix Electronics and suitable for battery monitoring, smoke detector interface, infrared receiver, and solar-powered sensor node applications requiring stable component supply and long-term industrial availability.
Supply support for LTC1541CS8#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC1541 family.
The LTC1541CS8#PBF belongs to Linear's micropower analog integration product line, designed specifically for ultra-low-power sensing, battery management, and safety-critical monitoring where minimizing standby current and component count is essential.
FAQ
What is the operating temperature range guaranteed for the LTC1541CS8#PBF?
The LTC1541CS8#PBF is specified for commercial-grade operation from 0°C to 70°C, with functional guarantee from –40°C to 85°C. Its 1.2V reference maintains ±1% accuracy across the –40°C to 85°C range, making LTC1541CS8#PBF suitable for automotive cabin and industrial environments where extended temperature performance is required despite the 'C' grade marking.
Can the LTC1541CS8#PBF drive a 0.01µF bypass capacitor on its REF pin without oscillation?
Yes, the LTC1541CS8#PBF reference output is explicitly characterized to drive up to 0.01µF capacitive loads without oscillation. This capability is confirmed in the datasheet's Electrical Characteristics table and Typical Performance Characteristics (TPC03), ensuring stable reference voltage under transient load conditions - a critical feature for reliable comparator operation in LTC1541CS8#PBF-based designs.
Is the LTC1541CS8#PBF pin-compatible with the MAX951?
Yes, the LTC1541CS8#PBF is advertised as a pin-compatible upgrade for the MAX951/MAX953. Both use the same SO-8 package and share identical pin functions: AMPOUT/OUT, AMPIN–/IN–, AMPIN+/IN+, VSS/GND, COMPIN+/THRESH, REF/VREF, COMPOUT/OUT, and VCC/VDD - allowing direct replacement in existing layouts without PCB changes, though LTC1541CS8#PBF adds the integrated op amp not present in MAX951.
What is the maximum capacitive load the op amp output of the LTC1541CS8#PBF can drive stably?
The op amp output of the LTC1541CS8#PBF is designed to drive capacitive loads up to 1000pF while maintaining stability in unity-gain configuration. This is verified in the datasheet's Typical Performance Characteristics (TPC11) and Applications Information section, enabling direct connection to sampling capacitors in SAR ADCs or RC filter stages without external isolation resistors - a key differentiator of LTC1541CS8#PBF versus standard micropower op amps.
Does the LTC1541CS8#PBF include hysteresis on its comparator, and what is its value?
Yes, the LTC1541CS8#PBF comparator includes internal hysteresis of ±2.25mV, as specified in the Electrical Characteristics table under "Internal ±2.25mV Comparator Hysteresis." This fixed hysteresis ensures clean, chatter-free output transitions even with slow-moving or noisy input signals - a design-critical feature for reliable threshold detection in LTC1541CS8#PBF-based battery monitoring and alarm circuits.
LTC1541CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Amplifier, Comparator, Reference
- Applications:
- GSM
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SO
LTC1541CS8#PBF FAQ
1.How can I place an order for LTC1541CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1541CS8#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 LTC1541CS8#PBF reliable?
The price and inventory of LTC1541CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1541CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1541CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1541CS8#PBF transactions.
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4.How is shipping managed for LTC1541CS8#PBF?
LTC1541CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1541CS8#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 LTC1541CS8#PBF?
For technical support, including LTC1541CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1541CS8#PBF requirements.
6.How does Aetrix verify that LTC1541CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1541CS8#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 LTC1541CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1541CS8#PBF?
All LTC1541CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1541CS8#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 LTC1541CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1541CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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