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Analog Devices Inc. LTC1445IS#TRPBF
- Part No.:
- LTC1445IS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1445IS#TRPBF.pdf
- Description:
- IC COMPARATOR 4 W/VOLT REF 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,312
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Product details
Overview
LTC1445IS#TRPBF from Analog Devices (formerly Linear Technology) is an ultralow power quad comparator IC with integrated 1.221V ±1% precision reference, programmable hysteresis via HYST pin, TTL/CMOS-compatible push-pull outputs, and operation from 2V to 11V single supply or ±1V to ±5.5V dual 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 - ideal for battery-powered voltage monitoring and threshold detection.
For engineers reviewing the LTC1445IS#TRPBF datasheet, LTC1445IS#TRPBF pinout, LTC1445IS#TRPBF application, or LTC1445IS#TRPBF equivalent, key selection criteria include its guaranteed 1.221V reference accuracy over –40°C to +85°C, adjustable hysteresis capability (REF–HYST ≤50mV), 12µs typical propagation delay at 10mV overdrive, and SO-16 package compatibility with industrial temperature grade.
Technical Context
The LTC1445IS#TRPBF implements four independent rail-to-rail input comparators sharing a single internal bandgap reference referenced to V–. Its HYST pin enables precise hysteresis programming using two external resistors, where VHB = 2 × (VREF – VHYST), with max 100mV total hysteresis band. The push-pull output stage eliminates crowbar current during transitions, preventing supply glitches.
Input leakage is ≤±1.0nA over temperature, CMRR and PSRR are ≥0.1mV/V, and the reference can drive up to 0.01µF without oscillation. Comparator inputs operate down to V– and up to V+ – 1.3V, supporting wide dynamic range sensing in low-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 11V single supply or ±1V to ±5.5V dual supply - enables direct use in 3.3V, 5V, and 9V battery systems without level-shifting. |
| Quiescent Current | ≤8.5µA over full –40°C to +85°C range - extends shelf life and runtime in always-on sensor nodes and IoT endpoints. |
| Reference Voltage | 1.221V ±1% (C-temp), ±1.5% (I-temp) - provides stable, factory-trimmed threshold for accurate voltage monitoring without external references. |
| Propagation Delay | 12µs typical at 10mV overdrive, COUT = 100pF - balances speed and ultralow power for slow-to-moderate event detection (e.g., battery low-alert). |
| Output Drive Capability | 40mA continuous source, 5mA sink per comparator - directly drives LEDs, small relays, or logic inputs without external buffers. |
| Input Common-Mode Range | V– to V+ – 1.3V - allows sensing near ground or high-side signals in single-supply configurations. |
| Hysteresis Control | Programmable via HYST pin (REF – HYST ≤50mV) - enables noise-immune switching with user-defined window width. |
Pinout & Package
Package: 16-lead plastic SO (Small Outline), industrial temperature grade (–40°C to +85°C), RoHS-compliant lead-free finish, tape-and-reel packaging (TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT B (1) | Comparator B output | Push-pull TTL/CMOS output; sources up to 40mA, sinks 5mA; compatible with 3.3V/5V logic families. |
| OUT A (2) | Comparator A output | Identical to OUT B; enables independent control of two system functions (e.g., charge enable + fault latch). |
| V+ (3) | Positive supply | Accepts 2V–11V; bypass with 0.1µF capacitor recommended if source impedance >1Ω or load >1mA. |
| IN A– (4) | Inverting input A | Rail-to-rail capable (V– to V+ – 1.3V); 10pA typical input leakage minimizes divider error in high-Z sensing. |
| IN A+ (5) | Noninverting input A | Same input specs as IN A–; used with external resistor dividers for precise threshold setting. |
| IN B– (6) | Inverting input B | Independent channel; supports multi-threshold monitoring (e.g., under-voltage + over-voltage on same rail). |
| IN B+ (7) | Noninverting input B | Paired with IN B–; enables differential or single-ended comparison with shared reference. |
| REF (8) | Reference output | 1.221V ±1% referenced to V–; drives 0.01µF bypass cap directly; sources 200µA / sinks 15µA max. |
| V– (9) | Negative supply | Connect to GND for single supply; required for dual supply operation; internally tied to exposed pad in DFN. |
| IN C– (10) | Inverting input C | Third comparator input pair; supports window or sequential detection schemes across four independent channels. |
| IN C+ (11) | Noninverting input C | Enables simultaneous monitoring of multiple supply rails or sensor outputs with one device. |
| IN D– (12) | Inverting input D | Fourth channel input; allows full quad thresholding (e.g., battery SOC zones: critical/low/normal/high). |
| IN D+ (13) | Noninverting input D | Completes fourth comparator; supports hysteresis configuration when paired with HYST pin. |
| HYST (14) | Hysteresis control input | Accepts voltage from REF – 50mV to REF; sets hysteresis band width; short to REF to disable hysteresis. |
| OUT D (15) | Comparator D output | Push-pull output identical to OUT A/B; supports independent latching or LED indication per monitored condition. |
| OUT C (16) | Comparator C output | Final output channel; enables compact 4-state status encoding (e.g., 2-bit binary output for fault classification). |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | ≤8.5µA over –40°C to +85°C ensures >10-year battery life in coin-cell–powered devices. |
| Integrated precision reference | 1.221V ±1% (0°C–70°C), ±1.5% (–40°C–85°C) eliminates need for external reference IC or resistor divider trimming. |
| Programmable hysteresis | Adjustable 0–100mV input hysteresis via two resistors on HYST pin - prevents chatter in noisy environments. |
| No crowbar current | Output stage avoids simultaneous P/N FET conduction during switching - removes supply rail disturbance in sensitive analog sections. |
| Wide input common-mode range | V– to V+ – 1.3V enables direct sensing of signals near ground or high-side voltages without level shifters. |
| 40mA output source capability | Drives LEDs, optocouplers, or logic gates directly - reduces BOM count and PCB area vs. discrete driver solutions. |
Applications
| Battery Voltage Monitoring | Multi-Rail Power Sequencing |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during discharge to trigger low-battery warning and safe shutdown. IC Role / Device Role / Timing Role: Quad comparator compares cell voltage against four thresholds (e.g., 4.2V, 3.8V, 3.5V, 3.2V) using internal 1.221V reference and resistor dividers. Use Value: Eliminates external reference and four discrete comparators; hysteresis prevents false triggers during transient load drops. |
Use Scenario: Ensuring correct power-up order across 5V, 3.3V, and 1.8V rails in FPGA or microprocessor systems. IC Role / Device Role / Timing Role: Each comparator monitors one rail; outputs enable downstream regulators only after upstream rails reach valid voltage. Use Value: Single SO-16 IC replaces three separate supervisor ICs; programmable hysteresis accommodates rail tolerance stacking. |
| Glitch-Immune Threshold Detector | Window Comparator for Sensor Signals |
Use Scenario: Detecting overvoltage events on a 12V automotive supply subject to load-dump transients. IC Role / Device Role / Timing Role: One comparator channel compares scaled supply voltage to 1.221V reference; HYST pin adds 50mV hysteresis to reject <100ms spikes. Use Value: Reference stability over temperature ensures consistent trip point; no external hysteresis components needed beyond two resistors. |
Use Scenario: Validating thermistor output stays within acceptable range (e.g., 25°C ±5°C) in HVAC control. IC Role / Device Role / Timing Role: Two comparators form window: IN+ of first tied to upper threshold, IN– of second to lower threshold; OR'd outputs indicate in-window state. Use Value: Internal reference guarantees matched thresholds; 40mA outputs drive indicator LEDs directly without added drivers. |
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 |
|---|---|---|---|
| LTC1444IS#TRPBF | Open-drain outputs (sinks only), same reference and hysteresis capability | Requires external pull-up for logic-high output; better suited for wired-OR bus or level translation | Select when interfacing with mixed-voltage systems or needing open-drain flexibility. |
| LTC1440CS#TRPBF | Single comparator, 1.128V ±1% reference, 5.7µA supply current, no hysteresis pin | Lacks quad integration and programmable hysteresis; smaller footprint but higher channel count cost | Select for space-constrained single-threshold applications where hysteresis is fixed or unnecessary. |
Compared with LTC1444IS#TRPBF, LTC1445IS#TRPBF offers push-pull outputs eliminating external pull-ups, while LTC1440CS#TRPBF trades integration and hysteresis control for lower quiescent current and smaller 8-lead SO package - choice depends on output interface needs and channel density requirements.
Availability
LTC1445IS#TRPBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, threshold detectors, and window comparators requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for LTC1445IS#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 its precision analog portfolio, focusing on high-performance signal conditioning, power management, and interface ICs for industrial, automotive, and communications markets.
The LTC1445IS#TRPBF belongs to Linear's ultralow power comparator family designed specifically for energy-constrained applications such as portable instrumentation, remote sensors, and always-on monitoring systems where nanoscale quiescent current and integrated reference accuracy are critical.
FAQ
What is the reference voltage tolerance of the LTC1445IS#TRPBF over temperature?
The LTC1445IS#TRPBF features a 1.221V internal 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 guaranteed in the datasheet and applies to all LTC1445 variants including LTC1445IS#TRPBF, enabling reliable threshold setting without calibration.
Can the LTC1445IS#TRPBF operate from a single 3.3V supply?
Yes, the LTC1445IS#TRPBF operates from a single 2V to 11V supply, making 3.3V fully supported. At 3.3V, its push-pull outputs swing from near V– (GND) to within 0.4V of V+, delivering VOH ≥ 2.9V and VOL ≤ 0.4V at rated loads - compatible with standard 3.3V CMOS logic inputs.
How is hysteresis programmed on the LTC1445IS#TRPBF?
Hysteresis is programmed on the LTC1445IS#TRPBF by connecting two resistors between REF, HYST, and V–. The hysteresis voltage band equals twice the voltage difference between REF and HYST pins, with a maximum allowed difference of 50mV (yielding up to 100mV total hysteresis). If unused, HYST must be shorted to REF.
What is the maximum capacitive load the LTC1445IS#TRPBF reference output can drive?
The LTC1445IS#TRPBF reference output can directly drive up to 0.01µF without oscillation. For larger bypass capacitors (up to 100µF), a series damping resistor is required - values range from ~10kΩ for 0.1µF to ~1kΩ for 10µF, as specified in the datasheet's Figure 2.
Does the LTC1445IS#TRPBF have rail-to-rail input capability?
The LTC1445IS#TRPBF inputs operate from V– to V+ – 1.3V, not full rail-to-rail. This means they accept signals down to the negative supply (GND in single-supply mode) but cannot sense within 1.3V of V+. For example, at V+ = 5V, the maximum input is 3.7V - sufficient for most threshold detection but not for sensing near V+.
LTC1445IS#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:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 16-SO
LTC1445IS#TRPBF FAQ
1.How can I place an order for LTC1445IS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1445IS#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 LTC1445IS#TRPBF reliable?
The price and inventory of LTC1445IS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1445IS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1445IS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1445IS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1445IS#TRPBF?
LTC1445IS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1445IS#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 LTC1445IS#TRPBF?
For technical support, including LTC1445IS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1445IS#TRPBF requirements.
6.How does Aetrix verify that LTC1445IS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1445IS#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 LTC1445IS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1445IS#TRPBF?
All LTC1445IS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1445IS#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 LTC1445IS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1445IS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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