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Analog Devices Inc. LTC1441CS8#PBF
- Part No.:
- LTC1441CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1441CS8#PBF.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
LTC1441CS8#PBF from Analog Devices (formerly Linear Technology) is an ultralow-power dual comparator with integrated 1.182V ±1% precision reference, programmable hysteresis (via HYST pin), and rail-to-rail CMOS outputs that source up to 40mA and sink up to 5mA. It operates from a single 2V–11V or dual ±1V–±5.5V supply and draws only 3.5µA typical supply current over temperature - ideal for battery-powered voltage monitoring and threshold detection in portable instrumentation.
For engineers reviewing the LTC1441CS8#PBF datasheet, LTC1441CS8#PBF pinout, LTC1441CS8#PBF application, or LTC1441CS8#PBF equivalent, key selection considerations include its dual-comparator architecture with independent inputs, guaranteed input common-mode range extending to V– and within 1.3V of V+, reference output stability with 0.01µF bypass capacitance, and absence of crowbar current during output transitions.
Technical Context
The LTC1441CS8#PBF integrates two independent comparators sharing a single internal 1.182V bandgap reference referenced to V–. Each comparator features input leakage <±1nA, offset voltage ±3mV (max), and propagation delay of 12µs (10mV overdrive, COUT=100pF). Its HYST pin enables adjustable hysteresis by resistor divider, with VHYST range from REF – 50mV to REF.
Unlike the LTC1440 (which includes GND pin for TTL-compatible output swing), the LTC1441CS8#PBF outputs swing fully from V– to V+, supporting true dual-supply operation. Input common-mode range is specified from V– to V+ – 1.3V, and the reference can source 100µA while maintaining ≤1mV drift - enabling direct driving of small capacitive loads without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single: 2V to 11V; Dual: ±1V to ±5.5V - supports wide-input battery systems and split-rail signal conditioning. |
| Supply Current (TYP) | 3.5µA at –40°C to +85°C - enables multi-year operation on coin-cell batteries. |
| Reference Voltage | 1.182V ±1% (0°C to 70°C), ±1.5% (–40°C to 85°C) - stable reference for precision threshold setting without external components. |
| Input Offset Voltage | ±3mV (max, full temp range) - ensures reliable detection of small differential signals (e.g., sensor outputs). |
| Propagation Delay | 12µs @ 10mV overdrive, COUT=100pF - balances speed and ultra-low power for wake-up or alert circuits. |
| Output Drive | Sources 40mA / sinks 5mA - directly drives LEDs, MOSFET gates, or logic inputs without external buffers. |
| Input Leakage Current | ±0.01nA (typ) - preserves high-impedance sensor node integrity and minimizes bias errors. |
Pinout & Package
Package: 8-lead plastic SO (S8), 150°C max junction temperature, θJA = 175°C/W. RoHS-compliant lead-free (PBF) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT A | Comparator A output | CMOS rail-to-rail output swinging from V– to V+; capable of sourcing 40mA continuously. |
| 2: V– | Negative supply | Reference for internal reference and comparator outputs; must be ≤ GND in single-supply use. |
| 3: IN A+ | Noninverting input A | High-impedance input (leakage <±1nA); common-mode range extends to V– and within 1.3V of V+. |
| 4: IN A– | Inverting input A | Matches IN A+ specs; enables standard inverting/noninverting configurations. |
| 5: IN B– | Inverting input B | Independent second comparator input; identical electrical specs to IN A±. |
| 6: IN B+ | Noninverting input B | Enables dual-threshold or window-comparator topologies with shared reference. |
| 7: V+ | Positive supply | Accepts 2V–11V single or ±1V–±5.5V dual; bypassing with 0.1µF recommended if sourcing >1mA. |
| 8: OUT B | Comparator B output | Functionally identical to OUT A; allows independent control of two decision paths. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA typ over full –40°C to +85°C range - extends battery life in always-on monitoring nodes. |
| Integrated 1.182V reference | ±1% accuracy (0°C–70°C), drives 0.01µF capacitor without oscillation - eliminates external reference IC and reduces BOM count. |
| No crowbar current | Eliminates supply glitches during output transitions - critical for noise-sensitive analog subsystems sharing same rail. |
| Programmable hysteresis | HYST pin accepts REF–50mV to REF; enables precise 10–100mV hysteresis bands via two resistors - prevents chatter near thresholds. |
| Rail-to-rail CMOS outputs | Swing from V– to V+ with 40mA source/5mA sink capability - interfaces directly with logic, MOSFETs, or indicator LEDs. |
Applications
| Battery Voltage Monitor | Low-Power Window Detector |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during sleep mode to trigger wake-up at 3.0V and shut-down at 2.8V. IC Role / Device Role / Timing Role: Dual comparator uses shared internal reference to compare against scaled battery voltage; one channel detects low threshold, the other high threshold. Use Value: Eliminates need for external reference and two discrete comparators, reducing PCB area by >40% and total quiescent current to 3.5µA. |
Use Scenario: Detecting valid sensor output range (e.g., 0.5V–4.5V) in industrial temperature transmitters. IC Role / Device Role / Timing Role: LTC1441CS8#PBF configured as window comparator with hysteresis on both thresholds to reject noise-induced false triggers. Use Value: Built-in reference ensures ratio-metric accuracy across temperature; hysteresis resistors set precise 50mV band per threshold. |
| Microcontroller Wake-Up Circuit | Glitch-Free Level Shifter |
|
Use Scenario: Waking an MCU from deep sleep when external event exceeds threshold (e.g., motion sensor output crosses 1.2V). IC Role / Device Role / Timing Role: Single comparator channel compares sensor signal to internal 1.182V reference; output drives MCU interrupt pin. Use Value: No external components required; 12µs response time ensures timely wake-up; 3.5µA current avoids draining backup battery. |
Use Scenario: Converting 0–2.5V analog sensor output to clean 0/5V logic levels for microcontroller ADC input protection. IC Role / Device Role / Timing Role: Comparator acts as rail-to-rail level shifter with hysteresis to prevent metastability during slow-rising signals. Use Value: Output swings fully to V+ (5V) and V– (0V), ensuring TTL/CMOS compatibility; no crowbar current avoids supply coupling into analog sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator with reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1442CS8#PBF | Includes REF and HYST pins (like LTC1441), but configured as dual comparator with shared reference and dedicated hysteresis control - same pinout, identical supply current and reference specs. | LTC1442 supports hysteresis on both comparators simultaneously via single HYST pin; LTC1441 requires separate resistor networks per channel if independent hysteresis needed. | Select LTC1442CS8#PBF when synchronized hysteresis across both channels is required; LTC1441CS8#PBF preferred for independent threshold control. |
| MAX922ESA+ | Higher supply current (12µA), no integrated reference, open-drain outputs, ±15mV offset - requires external reference and pull-up resistors. | Designed for higher-speed industrial interfaces; lacks micropower optimization and reference integration. | Choose MAX922ESA+ only if existing design already uses external reference and requires faster propagation (<300ns) - not drop-in compatible. |
Compared with LTC1442CS8#PBF, the LTC1441CS8#PBF offers independent comparator inputs without shared hysteresis constraints; versus MAX922ESA+, it delivers 3.5× lower quiescent current and eliminates two external components (reference + pull-up), reducing system-level power and layout complexity.
Availability
LTC1441CS8#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and industrial sensor nodes requiring stable component supply with long-term lifecycle support and traceable sourcing.
Supply support for LTC1441CS8#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 continuity, technical documentation, and long-term manufacturing commitment for legacy Linear parts including the LTC1441 series.
The LTC1441 belongs to Linear's ultralow-power comparator family designed specifically for energy-constrained applications where integrated precision reference, minimal supply current, and robust output drive must coexist - targeting portable, remote, and maintenance-free systems.
FAQ
What is the maximum capacitive load the LTC1441CS8#PBF reference output can drive without oscillation?
The LTC1441CS8#PBF reference output is characterized to drive up to 0.01µF capacitance without oscillation. For larger capacitors (up to 100µF), a series damping resistor is required - Figure 2 in the datasheet provides exact R vs C values. This capability eliminates need for external buffer stages in most low-frequency threshold detection designs using the LTC1441CS8#PBF.
Can the LTC1441CS8#PBF operate from a single 2.5V supply?
Yes, the LTC1441CS8#PBF operates from a single 2V to 11V supply. At 2.5V, the input common-mode range extends from V– (0V) to V+ – 1.3V = 1.2V, which fully encompasses the 1.182V internal reference - enabling valid comparator operation. Performance metrics (propagation delay, output drive) are specified down to 2V, though slight degradation occurs below 2.5V.
Does the LTC1441CS8#PBF have built-in hysteresis, or must it be added externally?
The LTC1441CS8#PBF does not include fixed hysteresis; it provides a HYST pin to enable programmable hysteresis via external resistors. Connecting HYST to REF disables hysteresis. The voltage difference between HYST and REF sets the hysteresis band (VHB = 2 × (VREF – VHYST)), with max VHB = 100mV. This architecture gives designers precise control over noise immunity per application using the LTC1441CS8#PBF.
What is the output voltage swing of the LTC1441CS8#PBF comparators?
The LTC1441CS8#PBF comparators feature rail-to-rail CMOS outputs that swing from V– to V+. When V– = 0V (single supply), OUT A and OUT B swing from 0V to V+. When used in dual-supply mode (e.g., V+ = +5V, V– = –5V), outputs swing from –5V to +5V. This differs from the LTC1440 (which has GND-referenced output) and ensures compatibility with mixed-signal systems using negative rails.
Is the LTC1441CS8#PBF pin-compatible with older MAX921/922-series comparators?
No - the LTC1441CS8#PBF is not pin-compatible with MAX921/922. While the datasheet notes "pin compatible upgrades for MAX921/922/923" apply to the LTC1440 (which shares GND/V+/OUT/IN+/IN– pinout), the LTC1441CS8#PBF uses a different 8-pin SO mapping: OUT A, V–, IN A+, IN A–, IN B–, IN B+, V+, OUT B. Direct replacement requires PCB layout revision.
LTC1441CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- CMOS, TTL
- Voltage - Supply, Single/Dual (±):
- 2V ~ 11V, ±1V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- 40mA
- Current - Output (Typ):
- 5.7µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 15µs
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LTC1441CS8#PBF FAQ
1.How can I place an order for LTC1441CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1441CS8#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 LTC1441CS8#PBF reliable?
The price and inventory of LTC1441CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1441CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1441CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1441CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1441CS8#PBF?
LTC1441CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1441CS8#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 LTC1441CS8#PBF?
For technical support, including LTC1441CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1441CS8#PBF requirements.
6.How does Aetrix verify that LTC1441CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1441CS8#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 LTC1441CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1441CS8#PBF?
All LTC1441CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1441CS8#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 LTC1441CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1441CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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