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Analog Devices Inc. LTC1443IS#PBF
- Part No.:
- LTC1443IS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1443IS#PBF.pdf
- Description:
- IC COMPARATOR 4 W/VOLT REF 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:5,349
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Product details
Overview
LTC1443IS#PBF from Analog Devices (formerly Linear Technology) is an ultralow power quad comparator IC with integrated 1.182V ±1% precision reference, TTL/CMOS-compatible push-pull outputs, and operation from single 2V–11V or dual ±1V–±5.5V supplies. 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 - enabling use in battery-powered voltage monitoring and threshold detection.
For engineers reviewing the LTC1443IS#PBF datasheet, LTC1443IS#PBF pinout, LTC1443IS#PBF application, or LTC1443IS#PBF equivalent, key selection criteria include its guaranteed industrial temperature range (–40°C to +85°C), SO-16 package compatibility, absence of programmable hysteresis (unlike LTC1444/LTC1445), and pin-compatible upgrade path from MAX924.
Technical Context
The LTC1443IS#PBF integrates four independent comparators sharing a single internal bandgap reference referenced to V–. Its output stage eliminates crowbar current during logic transitions, preventing supply glitches - critical for low-noise, micropower systems. Input leakage is typically ±10pA, supporting high-impedance sensing.
Pin 14 functions as GND (not HYST), distinguishing it from LTC1444/LTC1445 variants. The reference drives up to 0.01µF bypass capacitors without oscillation and maintains ±1.5% accuracy across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | ≤8.5µA max over full –40°C to +85°C range - enables multi-year battery life in always-on monitoring |
| Reference Voltage | 1.182V ±1% (C-temp), ±1.5% (I-temp) - stable reference for precision threshold setting |
| Input Offset Voltage | ±10mV max - ensures accurate decision points near trip thresholds |
| Propagation Delay | 14µs typical at 10mV overdrive - suitable for slow-varying signals like battery voltage trends |
| Output Drive | 40mA continuous source / 5mA sink - directly drives LEDs, small relays, or logic inputs without external buffers |
| Input Common-Mode Range | V– to V+ – 1.3V - supports rail-to-rail sensing in single-supply configurations |
| Supply Range | Single: 2V–11V; Dual: ±1V–±5.5V - accommodates wide input voltage domains including Li-ion and multi-cell systems |
Pinout & Package
Package: 16-pin Plastic Small Outline (SO-16), 150°C/W thermal resistance, industrial-grade temperature rating (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT B (1) | Comparator B output | Push-pull TTL/CMOS output; sources up to 40mA, sinks 5mA |
| OUT A (2) | Comparator A output | Push-pull TTL/CMOS output; identical drive capability to OUT B |
| V+ (3) | Positive supply | Accepts 2V–11V single or +1V–+5.5V dual supply rail |
| IN A– (4) | Inverting input A | High-impedance node (±10pA leakage); common-mode range extends to V– |
| IN A+ (5) | Noninverting input A | Same electrical characteristics as IN A–; supports precision differential sensing |
| GND (14) | Ground reference | Dedicated ground pin for output stage; connects to V– in single-supply operation |
| REF (8) | Reference output | 1.182V ±1% bandgap reference; drives 0.01µF bypass cap stably |
| V– (9) | Negative supply | Connect to GND for single-supply use; supports dual ±1V–±5.5V operation |
Key Features
| Feature | Design Value |
|---|---|
| No crowbar current | Eliminates supply rail glitches during output transitions - preserves signal integrity in sensitive analog sections |
| Reference stability | Drives 0.01µF capacitor without oscillation - simplifies layout and reduces external component count |
| Wide supply range | Operates from 2V to 11V single supply - compatible with coin cells, Li-ion, and 9V batteries |
| Industrial temp grade | Specified from –40°C to +85°C - suitable for automotive cabin, industrial sensors, and outdoor equipment |
| Low input leakage | ±10pA typical input bias current - enables high-resistance divider networks without error drift |
Applications
| Battery Voltage Monitor | Power Supply Sequencing |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during charge/discharge cycles to trigger low-battery alerts or cutoff. IC Role / Device Role / Timing Role: Quad comparator compares cell voltage against multiple thresholds (e.g., 4.2V full, 3.6V nominal, 3.0V critical) using internal reference. Use Value: Eliminates need for external reference IC and reduces BOM count by 3–4 components per monitored rail. | Use Scenario: Ensuring correct power-up order across multiple supply rails (e.g., 5V before 3.3V before 1.8V) in FPGA or microprocessor systems. IC Role / Device Role / Timing Role: Each comparator monitors one rail and asserts enable signals only when voltage exceeds its preset threshold. Use Value: Prevents latch-up or configuration errors caused by out-of-spec sequencing - no external timing components required. |
| Window Comparator | Threshold Detector with Hysteresis |
Use Scenario: Detecting if sensor output (e.g., temperature, pressure) remains within safe operating bounds. IC Role / Device Role / Timing Role: Two comparators form upper/lower limits using shared REF; third/fourth used for status indication or fault latching. Use Value: Single-chip solution replaces discrete op-amp + reference design - cuts PCB area by >60% and improves thermal tracking. | Use Scenario: Converting slowly varying analog signals (e.g., thermistor voltage) into clean digital logic with noise immunity. IC Role / Device Role / Timing Role: One comparator compares signal to REF; external resistors on HYST pin (not applicable to LTC1443) add hysteresis - but LTC1443 uses fixed-output logic for simple on/off decisions. Use Value: Push-pull outputs interface directly with MCU GPIOs; 40mA drive allows direct LED indication without current-limiting resistors. |
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 |
|---|---|---|---|
| LTC1441IS#PBF | Dual comparator (2 channels), same 1.182V reference, 5.7µA supply current, 8µs propagation delay | Fewer channels; lower power; faster response - suited for space-constrained dual-threshold designs | Select when only two comparison channels are needed and ultra-low ICC (<6µA) is prioritized over channel count |
| LTC1440CS#PBF | Single comparator, 1.128V ±1% reference, 5.5µA supply current, 8µs propagation delay | Single-channel only; different reference voltage; no pin compatibility - requires schematic redesign | Choose for minimal footprint and lowest possible quiescent current in single-threshold applications |
Compared with LTC1441IS#PBF and LTC1440CS#PBF, the LTC1443IS#PBF provides four independent comparators in one SO-16 package with higher output drive (40mA vs ≤10mA), making it optimal for multi-rail monitoring where channel density and direct load driving matter more than absolute minimum current draw.
Availability
LTC1443IS#PBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, threshold detectors, window comparators, and oscillator circuits requiring stable component supply across industrial temperature ranges.
Supply support for LTC1443IS#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 LTC1443 series.
The LTC1443 belongs to Linear's ultralow power comparator family designed specifically for energy-constrained applications such as portable instrumentation, remote sensors, and long-life battery-operated systems where µA-level quiescent current and integrated precision references are essential.
FAQ
What is the reference voltage tolerance of the LTC1443IS#PBF over temperature?
The LTC1443IS#PBF features a 1.182V internal reference with ±1% initial accuracy at 25°C and ±1.5% total variation over the full –40°C to +85°C industrial temperature range. This is confirmed in the Electrical Characteristics table under "VREF" with "I Temp Range" conditions, where min/max values are 1.164V and 1.200V respectively.
Does the LTC1443IS#PBF support dual-supply operation?
Yes, the LTC1443IS#PBF supports dual-supply operation from ±1V to ±5.5V. Its pinout includes dedicated V+ and V– pins, and the datasheet explicitly specifies dual-supply capability - unlike LTC1444/LTC1445 which require V– connection for open-drain sinking. The LTC1443IS#PBF's GND pin (Pin 14) is isolated from the output stage to maintain TTL compatibility in split-rail configurations.
Can the LTC1443IS#PBF drive an LED directly without a current-limiting resistor?
No - while the LTC1443IS#PBF can source up to 40mA per output, driving an LED directly risks exceeding forward voltage and damaging the output stage. A series current-limiting resistor is required to set safe LED current (e.g., 5–10mA). The 40mA rating is a maximum continuous capability, not a recommended operating point for sustained loads.
Is the LTC1443IS#PBF pin-compatible with the MAX924?
Yes, the LTC1443IS#PBF is explicitly documented as a pin-compatible upgrade for the MAX924. Both devices use the same SO-16 pinout, share identical functional assignments (including GND on Pin 14), and offer comparable quiescent current and reference accuracy - enabling drop-in replacement without PCB modification.
What is the maximum bypass capacitor the LTC1443IS#PBF reference can drive without oscillation?
The LTC1443IS#PBF reference output can drive a bypass capacitor of up to 0.01µF (10nF) without oscillation, as stated in the Applications Information section and confirmed in the Typical Application diagrams. For larger capacitors (up to 100µF), a series damping resistor (e.g., 430Ω for 1µF) must be added between REF and the capacitor to ensure stability.
LTC1443IS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 16-SO
LTC1443IS#PBF FAQ
1.How can I place an order for LTC1443IS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1443IS#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 LTC1443IS#PBF reliable?
The price and inventory of LTC1443IS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1443IS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1443IS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1443IS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1443IS#PBF?
LTC1443IS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1443IS#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 LTC1443IS#PBF?
For technical support, including LTC1443IS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1443IS#PBF requirements.
6.How does Aetrix verify that LTC1443IS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1443IS#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 LTC1443IS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1443IS#PBF?
All LTC1443IS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1443IS#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 LTC1443IS#PBF part is unused and in its original packaging.
Return procedure for LTC1443IS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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