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Analog Devices Inc. LTC1445CS#TRPBF
- Part No.:
- LTC1445CS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1445CS#TRPBF.pdf
- Description:
- IC COMPARATOR 4 W/VOLT REF 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,763
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Product details
Overview
LTC1445CS#TRPBF from Analog Devices (formerly Linear Technology) is an ultralow power quad comparator with integrated 1.221V ±1% bandgap reference, TTL/CMOS-compatible push-pull outputs, programmable hysteresis via HYST pin, and operation from 2V to 11V single supply. It delivers ≤8.5µA supply current over temperature, supports input common-mode range from V– to V+ – 1.3V, and sources up to 40mA per output - used in battery-powered voltage monitoring and precision threshold detection.
For engineers reviewing the LTC1445CS#TRPBF datasheet, LTC1445CS#TRPBF pinout, LTC1445CS#TRPBF application, or LTC1445CS#TRPBF equivalent, key selection criteria include its 1.221V reference accuracy, 12µs typical propagation delay at 10mV overdrive, 40mA continuous output source capability, and compatibility with SO-16 package layout for space-constrained industrial sensor interfaces.
Technical Context
The LTC1445CS#TRPBF integrates four independent comparators sharing a precision internal reference referenced to V–, enabling self-contained threshold detection without external voltage references. Its HYST pin allows resistor-programmed hysteresis (REF to HYST ≤50mV), yielding up to 100mV input hysteresis band while maintaining micropower operation.
Each comparator features rail-to-rail input capability down to V– and within 1.3V of V+, ±10pA typical input leakage, and CMOS push-pull outputs that eliminate crowbar current during switching - critical for low-noise, glitch-free operation in sensitive analog subsystems powered from weak or high-impedance supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | ≤8.5µA max over full temperature range - enables multi-year operation on coin-cell batteries |
| Reference Voltage | 1.221V ±1% (C-temp), ±1.5% (I-temp) - provides stable, factory-trimmed threshold without external components |
| Propagation Delay | 12µs typical at 10mV overdrive, COUT = 100pF - balances speed and ultralow power for slow-varying signals |
| Output Drive | 40mA continuous source, 5mA sink per comparator - directly drives LEDs, logic inputs, or small MOSFET gates |
| Input Common-Mode Range | V– to V+ – 1.3V - supports detection near ground or high-side sensing in 3.3V/5V systems |
| Hysteresis Control | Programmable via HYST pin (REF – 50mV to REF) - enables noise-immune level detection without external feedback |
| Supply Range | Single: 2V to 11V; Dual: ±1V to ±5.5V - operates across Li-ion, alkaline, and industrial supply rails |
Pinout & Package
Package: 16-pin Plastic Small Outline (SO-16), 150°C/W θJA, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT B (1) | Comparator B output | CMOS push-pull, sources 40mA, sinks 5mA - drives logic or loads directly without pull-up |
| OUT A (2) | Comparator A output | Identical to OUT B - enables independent control of two system functions |
| V+ (3) | Positive supply | Accepts 2V–11V single supply; bypass with 0.1µF capacitor if source impedance >1Ω |
| IN A– (4) | Inverting input A | Input common-mode extends to V–; leakage <±1nA - minimizes bias error in high-Z dividers |
| IN A+ (5) | Noninverting input A | Same specs as IN A– - forms precision differential pair for window or level detection |
| IN B– (6) | Inverting input B | Independent of other inputs - supports dual-threshold or redundant monitoring |
| IN B+ (7) | Noninverting input B | Matches IN A+/IN A– performance - maintains channel-to-channel consistency |
| REF (8) | Reference output | 1.221V ±1%, drives 0.01µF cap without oscillation - eliminates need for external reference buffer |
| V– (9) | Negative supply | Connect to GND for single-supply use; internally tied to exposed pad in DFN variant |
| IN C– (10) | Inverting input C | Third comparator input - expands functionality to triple-level or multi-zone detection |
| IN C+ (11) | Noninverting input C | Full rail-to-rail input range - enables accurate sensing across wide voltage spans |
| IN D– (12) | Inverting input D | Fourth independent input - supports complex state machines or fault-tolerant designs |
| IN D+ (13) | Noninverting input D | Same electrical specs as other inputs - ensures uniform design across all four channels |
| HYST (14) | Hysteresis control | Accepts voltage from REF – 50mV to REF; sets hysteresis band - replaces discrete resistor networks |
| OUT D (15) | Comparator D output | Push-pull output identical to OUT A - completes quad-channel drive capability |
| OUT C (16) | Comparator C output | Matches OUT A/OUT B/OUT D - enables simultaneous control of four independent circuits |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 8.5µA max over temperature - extends battery life in portable medical and IoT sensors |
| Integrated 1.221V reference | ±1% initial accuracy, ±1.5% over –40°C to +85°C - removes external reference IC and calibration |
| Programmable hysteresis | Up to 100mV input hysteresis via two resistors on HYST pin - suppresses chatter in noisy industrial environments |
| 40mA output source capability | Drives LEDs, relays, or logic directly - eliminates external driver transistors in low-power control stages |
| No crowbar current | Eliminates supply glitches during output transitions - preserves signal integrity in mixed-signal systems |
| Wide supply range | 2V–11V single supply - supports direct interface to Li-ion (2.7–4.2V), 3.3V, 5V, and 9V battery systems |
Applications
| Battery Voltage Monitor | Threshold Detector |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during charge/discharge cycles in portable instruments. IC Role / Device Role / Timing Role: Quad comparator compares cell voltage against 3.0V, 3.3V, 4.0V, and 4.2V thresholds using resistor-divided inputs and internal 1.221V reference. Use Value: Enables precise low-power state-of-charge indication without external reference or microcontroller ADC overhead. | Use Scenario: Detecting overvoltage/undervoltage conditions in 5V FPGA I/O banks. IC Role / Device Role / Timing Role: Two comparators monitor VCCIO against 4.5V and 5.5V limits; HYST pin adds 50mV hysteresis to prevent false trips from supply ripple. Use Value: Provides hardware-level protection with sub-10µA static current - avoids firmware latency and watchdog dependency. |
| Window Comparator | Oscillator Circuit |
Use Scenario: Validating sensor output stays within safe operating range (e.g., 0.5V–2.5V) in automotive cabin air quality modules. IC Role / Device Role / Timing Role: LTC1445CS#TRPBF's four comparators implement high/low limits and fail-safe alarm using shared REF and HYST pins. Use Value: Achieves full window detection in one SO-16 package with <9µA total supply current - reduces BOM count and PCB area vs discrete solutions. | Use Scenario: Generating clock signals for low-power microcontrollers in energy-harvesting nodes. IC Role / Device Role / Timing Role: Configured as relaxation oscillator using REF, HYST, and RC network on IN+; frequency set by R = 1MΩ, C = 100nF. Use Value: Delivers stable ~1Hz timing with 2.5µA average current - eliminates quartz crystal and associated load capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad comparator with reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1444CS#TRPBF | Open-drain outputs (sinks only), same 1.221V reference and HYST functionality | Requires external pull-up resistors; better suited for wired-OR bus interfacing or level translation | Select when interfacing to multiple loads sharing a common bus or needing V–-referenced sinking only |
| LTC1440CS8#TRPBF | Single comparator, 1.128V ±1% reference, 5.7µA supply current, SO-8 package | Lower integration; requires three additional devices for quad functionality and separate reference routing | Select when board space permits discrete implementation or when 1.128V threshold is required |
Compared with LTC1444CS#TRPBF, LTC1445CS#TRPBF offers push-pull outputs eliminating pull-ups, while LTC1440CS8#TRPBF trades integration for smaller footprint and lower per-channel cost in non-quad applications.
Availability
LTC1445CS#TRPBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, threshold detectors, window comparators, and oscillator circuits requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1445CS#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 LTC1445CS#TRPBF belongs to Linear Technology's ultralow power comparator family, designed specifically for energy-constrained applications including portable instrumentation, remote sensors, and always-on monitoring systems where µA-level quiescent current and integrated precision references are essential.
FAQ
What is the reference voltage tolerance of the LTC1445CS#TRPBF over temperature?
The LTC1445CS#TRPBF features a 1.221V bandgap reference with ±1% initial accuracy at 25°C and ±1.5% maximum deviation over the full –40°C to +85°C industrial temperature range. This specification is confirmed in the Electrical Characteristics table under VREF parameter with "l" notation indicating full-range applicability.
Can the LTC1445CS#TRPBF operate from a 2.5V single supply?
Yes, the LTC1445CS#TRPBF supports single-supply operation from 2V to 11V. At 2.5V, it maintains full functionality: input common-mode range extends from GND to 1.2V (V+ – 1.3V), reference remains stable, and outputs swing rail-to-rail. Supply current increases slightly to ~6.5µA at 2.5V per Typical Performance Characteristics graph G02.
How is hysteresis programmed on the LTC1445CS#TRPBF?
Hysteresis is programmed by connecting two resistors between REF, HYST, and V–. The voltage difference between REF and HYST sets half the input hysteresis band (VHB/2). For example, a 25mV difference yields 50mV total hysteresis. The HYST pin accepts voltages from REF – 50mV to REF; exceeding this range invalidates hysteresis behavior per Pin Functions description.
Does the LTC1445CS#TRPBF require external bypass capacitors?
The LTC1445CS#TRPBF reference output can drive up to 0.01µF directly without oscillation, so no external damping resistor is needed for small bypass caps. However, for V+ supply bypassing, a 0.1µF ceramic capacitor is recommended when source impedance exceeds 1Ω or output load exceeds 1mA, as stated in Applications Information section under "Power Supplies".
What is the maximum continuous output source current per comparator in the LTC1445CS#TRPBF?
Each comparator output in the LTC1445CS#TRPBF can continuously source up to 40mA while maintaining specified performance, as confirmed in both the "Features" list and Applications Information section. This capability is validated across the full temperature range and enables direct driving of LEDs, small solenoids, or logic inputs without external buffers.
LTC1445CS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- with Voltage Reference
- Number of Elements:
- 4
- Output Type:
- CMOS, TTL
- Voltage - Supply, Single/Dual (±):
- 2V ~ 11V, ±1V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- 0.015mA @ 5V
- Current - Output (Typ):
- 8.5µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 12µs
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 16-SO
LTC1445CS#TRPBF FAQ
1.How can I place an order for LTC1445CS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1445CS#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 LTC1445CS#TRPBF reliable?
The price and inventory of LTC1445CS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1445CS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1445CS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1445CS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1445CS#TRPBF?
LTC1445CS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1445CS#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 LTC1445CS#TRPBF?
For technical support, including LTC1445CS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1445CS#TRPBF requirements.
6.How does Aetrix verify that LTC1445CS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1445CS#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 LTC1445CS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1445CS#TRPBF?
All LTC1445CS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1445CS#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 LTC1445CS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1445CS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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