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Analog Devices Inc. LTC1541CS8#TRPBF
- Part No.:
- LTC1541CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Amplifiers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1541CS8#TRPBF.pdf
- Description:
- IC AMP COMP REF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,014
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Product details
Overview
LTC1541CS8#TRPBF 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#TRPBF datasheet, LTC1541CS8#TRPBF pinout, LTC1541CS8#TRPBF application, or LTC1541CS8#TRPBF equivalent, key selection criteria include its 5µA supply current, 1.2V reference accuracy over –40°C to 85°C, rail-to-rail output swing, 1.3V input common-mode headroom, and compatibility with 0.01µF reference bypass capacitance without oscillation.
Technical Context
The LTC1541CS8#TRPBF integrates three functional blocks on one die: a unity-gain-stable CMOS op amp (12kHz GBW, 8V/ms slew rate), a comparator with internal hysteresis and rail-to-rail CMOS output (20mA source/5mA sink), and a buffered 1.2V bandgap reference connected internally to the comparator's inverting input. All inputs share a common-mode range from VSS to VCC – 1.3V.
This architecture enables self-contained threshold detection without external reference components. The reference output sources up to 2mA and sinks 20µA while maintaining ±1% accuracy across temperature, and the op amp's 1nA max input bias current supports 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 and industrial power rails without regulation. |
| Quiescent Current | 5µA typical - enables multi-year operation from coin cells or energy-harvesting sources. |
| Reference Voltage | 1.200V ±1% over –40°C to 85°C - provides stable comparator trip point without external precision reference. |
| Comparator Hysteresis | ±2.25mV - prevents chatter on slow-moving or noisy input signals in alarm and detector applications. |
| Op Amp GBW | 12kHz - sufficient for DC-coupled sensor amplification and low-frequency filtering in smoke detectors or IR receivers. |
| Input Common-Mode Range | VSS to VCC – 1.3V - allows direct sensing of ground-referenced signals in single-supply systems. |
| Capacitive Load Drive | 1000pF for op amp, 0.01µF for reference - eliminates need for external isolation resistors in most bypass configurations. |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150-inch body), JEDEC MS-012 variant. Pin 1 identifier notch located at top-left corner when viewed from top with marking side up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AMPOUT) | Op amp output | Rail-to-rail swing; drives ≥1000pF; sources/sinks ≥0.7mA - suitable for direct connection to ADC inputs or logic buffers. |
| 2 (AMPIN–) | Op amp inverting input | CMOS input; ≤1nA bias current; common-mode range extends to VSS - enables high-Z feedback networks. |
| 3 (AMPIN+) | Op amp noninverting input | CMOS input; ≤1nA bias current; same common-mode range as AMPIN– - supports ground-sensing configurations. |
| 4 (VSS) | Negative supply / ground | Reference node for all analog blocks; must be low-impedance for stable reference and comparator operation. |
| 5 (COMPIN+) | Comparator noninverting input | High-impedance CMOS node; accepts signals from VSS to VCC – 1.3V - used for threshold comparison against REF. |
| 6 (REF) | 1.2V reference output | Internally connected to COMPIN–; sources 2mA/sinks 20µA; stable with 0.01µF bypass - eliminates external reference IC. |
| 7 (COMPOUT) | Comparator output | Rail-to-rail CMOS output; 20mA source/5mA sink capability - directly drives LEDs, MOSFET gates, or microcontroller interrupts. |
| 8 (VCC) | Positive supply | 2.5V–12.6V input; bypassing with 0.1µF recommended - powers all internal blocks with minimal external components. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 5µA typical ICC enables >10-year battery life in coin-cell-powered safety sensors. |
| Integrated 1.2V reference | ±1% accuracy over –40°C to 85°C eliminates calibration and external reference components. |
| Rail-to-rail op amp output | Full dynamic range utilization with 3V–5V supplies improves ADC resolution in portable devices. |
| Comparator with internal hysteresis | ±2.25mV hysteresis ensures noise-immune switching in low-SNR environments like smoke detectors. |
| Single-supply compatible inputs | VSS-to-(VCC–1.3V) common-mode range allows direct ground-referenced signal conditioning. |
Applications
| Battery Monitoring System | Smoke Detector Interface |
|---|---|
Use Scenario: Continuous voltage monitoring of lithium coin cells or alkaline batteries in remote sensors. IC Role / Device Role / Timing Role: LTC1541CS8#TRPBF compares battery voltage against its internal 1.2V reference using the comparator, while the op amp conditions weak sensor signals. Use Value: Eliminates external voltage reference and reduces BOM count by integrating op amp + comparator + reference in one SO-8 package. | Use Scenario: Interfacing ionization chamber current to microcontroller with low-power wake-up capability. IC Role / Device Role / Timing Role: LTC1541CS8#TRPBF op amp amplifies picoamp-level chamber current; comparator triggers alarm when amplified signal exceeds REF-based threshold. Use Value: 5µA supply current extends detector standby time; ±2.25mV hysteresis prevents false alarms from EMI or supply ripple. |
| Infrared Remote Receiver | Automotive Keyless Entry Sensor |
Use Scenario: Demodulating 38kHz carrier bursts from IR remotes in battery-powered consumer electronics. IC Role / Device Role / Timing Role: LTC1541CS8#TRPBF op amp AC-couples and amplifies photodiode signal; comparator converts analog envelope to clean digital pulses. Use Value: Rail-to-rail output ensures full logic-level swing into MCU GPIO; 12kHz GBW handles envelope bandwidth without distortion. | Use Scenario: Detecting low-current RF leakage or proximity signals in passive keyless entry (PKE) fob receivers. IC Role / Device Role / Timing Role: LTC1541CS8#TRPBF op amp boosts weak antenna signals; comparator provides fast, hysteresis-stabilized decision against internal REF. Use Value: 1nA max input bias current preserves signal integrity from high-impedance antenna circuits; SO-8 package fits space-constrained fob PCBs. |
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+ | Pin-compatible SO-8; 1.18V reference (±2%), 8µA ICC, no rail-to-rail op amp output. | Lower reference accuracy and higher supply current; op amp output limited to VCC – 0.8V. | Select MAX951ESA+ only if legacy pinout compatibility is required and 1.2V ±1% reference stability is not critical. |
| TLV7032IDR | Separate dual comparator (no op amp or reference); 1.8V–5.5V supply; 650nA per comparator. | Requires external op amp and reference; lower ICC but higher total component count and board area. | Choose TLV7032IDR when ultra-low ICC (<1µA) dominates design priority and integration is secondary. |
Compared with MAX951ESA+, LTC1541CS8#TRPBF delivers tighter reference accuracy (±1% vs ±2%) and rail-to-rail output, enabling higher ADC utilization; versus TLV7032IDR, it trades 1µA ICC savings for significant BOM reduction and simplified layout via monolithic integration.
Availability
LTC1541CS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered safety sensors, infrared remote receivers, and automotive keyless entry modules requiring stable component supply and long-term lifecycle support.
Supply support for LTC1541CS8#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC1541 series.
The LTC1541 product line was designed specifically for ultra-low-power, space-constrained applications such as smoke detectors, remote controls, and battery-monitoring systems where integration of op amp, comparator, and reference minimizes footprint and power consumption.
FAQ
What is the operating temperature range guaranteed for the LTC1541CS8#TRPBF?
The LTC1541CS8#TRPBF is specified for commercial-grade operation from 0°C to 70°C and is characterized to function reliably from –40°C to 85°C. Its 1.2V reference maintains ±1% accuracy across the –40°C to 85°C range, making LTC1541CS8#TRPBF suitable for industrial and automotive interior environments.
Can the LTC1541CS8#TRPBF drive a 1000pF capacitive load with the op amp output?
Yes, the LTC1541CS8#TRPBF op amp is internally compensated for unity-gain stability and explicitly rated to drive up to 1000pF without oscillation. This capability allows direct connection to sampling capacitors in SAR ADCs or long PCB traces without added isolation resistors - a key advantage confirmed in the LTC1541CS8#TRPBF datasheet Figure TPC11.
How is the reference voltage used internally in the LTC1541CS8#TRPBF?
In the LTC1541CS8#TRPBF, the 1.2V reference output (Pin 6) is internally connected to the comparator's inverting input (COMPIN–). This configuration enables immediate threshold detection using only the noninverting input (COMPIN+) - eliminating external resistive dividers and ensuring consistent trip points across temperature and supply variations in LTC1541CS8#TRPBF designs.
Does the LTC1541CS8#TRPBF require external bypass capacitors on VCC?
A 0.1µF ceramic capacitor from VCC (Pin 8) to VSS (Pin 4) is recommended for stable operation, especially in noisy environments. While the LTC1541CS8#TRPBF can operate without it under low-impedance supply conditions, the datasheet specifies this bypass as good practice to suppress supply transients that could disturb the 1.2V reference or cause false comparator triggering in LTC1541CS8#TRPBF applications.
What is the maximum source/sink current capability of the LTC1541CS8#TRPBF comparator output?
The COMPOUT pin (Pin 7) of the LTC1541CS8#TRPBF can source up to 20mA and sink up to 5mA continuously. This allows direct driving of LEDs, small relays, or microcontroller interrupt inputs without external buffer transistors - a verified specification found in the Electrical Characteristics table under VOH/VOL test conditions for LTC1541CS8#TRPBF.
LTC1541CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Amplifier, Comparator, Reference
- Applications:
- GSM
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SO
LTC1541CS8#TRPBF FAQ
1.How can I place an order for LTC1541CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1541CS8#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 LTC1541CS8#TRPBF reliable?
The price and inventory of LTC1541CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1541CS8#TRPBF is usually 5 days.
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LTC1541CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1541CS8#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 LTC1541CS8#TRPBF?
For technical support, including LTC1541CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1541CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1541CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1541CS8#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 LTC1541CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1541CS8#TRPBF?
All LTC1541CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1541CS8#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 LTC1541CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1541CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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