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Analog Devices Inc. LTC1445CN#PBF
- Part No.:
- LTC1445CN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1445CN#PBF.pdf
- Description:
- IC COMPARATOR 4 W/VOLT REF 16DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC1445CN#PBF 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 or ±1V to ±5.5V dual supply. It delivers 8.5µA max supply current, 12µs typical propagation delay (10mV overdrive), and 40mA continuous output source capability - ideal for battery-powered voltage monitoring and precision threshold detection.
For engineers reviewing the LTC1445CN#PBF datasheet, LTC1445CN#PBF pinout, LTC1445CN#PBF application, or LTC1445CN#PBF equivalent, key selection criteria include its guaranteed 1.221V reference accuracy over temperature, hysteresis configurability using two external resistors, rail-to-rail input range (V– to V+ – 1.3V), absence of crowbar current during output transitions, and compatibility with 0.01µF reference bypass capacitors without oscillation.
Technical Context
The LTC1445CN#PBF implements four independent comparators sharing a precision internal reference referenced to V–. Its HYST pin enables adjustable hysteresis by setting a voltage difference between REF and HYST (max 50mV), yielding up to 100mV hysteresis band at the inputs. Input common-mode range extends from V– to V+ – 1.3V, with typical input leakage of ±10pA at 25°C.
Output stages are push-pull (not open-drain), supporting full TTL/CMOS logic levels: VOH ≥ V+ – 0.4V at –15mA sink, VOL ≤ V– + 0.4V at 1.8mA source. The reference can source up to 200µA and sink 15µA while maintaining ±1.5% accuracy across –40°C to 85°C industrial temperature range.
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) - stable reference for accurate threshold setting |
| Propagation Delay | 12µs typ (10mV overdrive, COUT=100pF) - suitable for low-speed monitoring and control loops |
| Input Common-Mode Range | V– to V+ – 1.3V - supports direct sensing near ground or rail in single-supply systems |
| Output Drive | 40mA continuous source / 5mA sink - drives LEDs, small relays, or logic inputs directly |
| Hysteresis Control | Programmable via HYST pin (REF – 50mV to REF) - eliminates noise-induced chatter without external components |
| Reference Load Capability | Drives 0.01µF capacitor without oscillation - simplifies filtering and improves noise immunity |
Pinout & Package
Package: 16-pin PDIP (Plastic Dual In-line Package), 0.300-inch width, commercial temperature range (0°C to 70°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; sources up to 40mA, sinks 5mA |
| V+ (3) | Positive supply | Accepts 2V to 11V single supply or positive rail of dual supply |
| IN A– (4) | Inverting input A | Rail-to-rail capable (V– to V+ – 1.3V); 10pA typical leakage |
| IN A+ (5) | Noninverting input A | Rail-to-rail capable (V– to V+ – 1.3V); 10pA typical leakage |
| IN B– (6) | Inverting input B | Rail-to-rail capable (V– to V+ – 1.3V); 10pA typical leakage |
| IN B+ (7) | Noninverting input B | Rail-to-rail capable (V– to V+ – 1.3V); 10pA typical leakage |
| REF (8) | Reference output | 1.221V ±1% referenced to V–; drives 0.01µF bypass cap stably |
| V– (9) | Negative supply | Connect to GND for single supply; supports ±1V to ±5.5V dual operation |
| IN C– (10) | Inverting input C | Rail-to-rail capable (V– to V+ – 1.3V); 10pA typical leakage |
| IN C+ (11) | Noninverting input C | Rail-to-rail capable (V– to V+ – 1.3V); 10pA typical leakage |
| IN D– (12) | Inverting input D | Rail-to-rail capable (V– to V+ – 1.3V); 10pA typical leakage |
| IN D+ (13) | Noninverting input D | Rail-to-rail capable (V– to V+ – 1.3V); 10pA typical leakage |
| HYST (14) | Hysteresis control input | Accepts voltage from REF – 50mV to REF; sets hysteresis band |
| OUT D (15) | Comparator D output | Push-pull TTL/CMOS output; sources up to 40mA, sinks 5mA |
| OUT C (16) | Comparator C output | Push-pull TTL/CMOS output; sources up to 40mA, sinks 5mA |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 8.5µA max over temperature - extends battery life in portable sensors and IoT nodes |
| Integrated precision reference | 1.221V ±1% (0°C–70°C) - eliminates need for external voltage reference IC or resistor divider |
| Programmable hysteresis | Configurable via HYST pin with two resistors - prevents false triggering in noisy environments |
| No crowbar current | Eliminates supply glitches during output transitions - improves system-level noise immunity |
| Wide supply range | 2V to 11V single supply or ±1V to ±5.5V dual supply - supports diverse power architectures |
| Robust input protection | Withstands ±0.3V beyond rails - enhances reliability in transient-prone applications |
Applications
| Battery Voltage Monitor | Industrial Threshold Detector |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage (2.5V–4.2V) to trigger low-battery warning or shutdown before deep discharge. IC Role / Device Role / Timing Role: Quad comparator compares divided battery voltage against 1.221V reference; hysteresis prevents chatter near trip point. Use Value: Enables precise, low-power state-of-charge indication using only passive dividers and no external reference. | Use Scenario: Detecting overvoltage/undervoltage conditions on 24V DC industrial bus lines with ±5% tolerance. IC Role / Device Role / Timing Role: Two comparators configured as window detector; third monitors reference stability; fourth provides status flag. Use Value: Single-chip solution replaces discrete op-amp + reference + hysteresis network, reducing BOM count and board space. |
| Glitch-Free Power Sequencing | Low-Power Oscillator Core |
Use Scenario: Ensuring correct power-up order of FPGA, memory, and analog subsystems in embedded controllers. IC Role / Device Role / Timing Role: Each comparator validates presence and stability of individual supply rails (e.g., 3.3V, 1.8V, 1.2V) before enabling next stage. Use Value: Push-pull outputs drive enable pins directly; 8.5µA quiescent current avoids loading sequencing circuitry. | Use Scenario: Building relaxation oscillator for ultra-low-power wake-up timer in sleep-mode microcontrollers. IC Role / Device Role / Timing Role: One comparator charges/discharges timing capacitor; reference provides stable trip threshold; hysteresis defines frequency. Use Value: Achieves sub-1µA oscillator current with predictable frequency determined by R/C and 1.221V reference. |
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 |
|---|---|---|---|
| LTC1444CN#PBF | Open-drain outputs (sink-only), same reference and hysteresis capability | Requires external pull-up for logic-high level; better suited for wired-OR or level-shifting | Select when interfacing with mixed-voltage logic or needing open-drain flexibility |
| LTC1440CS#PBF | Single comparator, 1.128V reference, 5.7µA supply current, SO-8 package | Lower channel count and different reference voltage; smaller footprint but no quad integration | Select when only one comparator is needed and board space is constrained |
Compared with LTC1444CN#PBF, LTC1445CN#PBF offers push-pull outputs eliminating external pull-ups, while LTC1440CS#PBF trades channel count and reference value for reduced size and lower quiescent current - choice depends on output interface requirements and system-level integration needs.
Availability
LTC1445CN#PBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, threshold detectors, window comparators, and oscillator circuits requiring stable component supply and long-term obsolescence support.
Supply support for LTC1445CN#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, manufacturing, and documentation for legacy Linear parts including the LTC1445 series.
The LTC1445CN#PBF 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 µA-level supply current and integrated precision references are critical.
FAQ
What is the reference voltage tolerance of the LTC1445CN#PBF over temperature?
The LTC1445CN#PBF features a 1.221V bandgap reference with ±1% initial accuracy at 25°C and ±1.5% total accuracy over the full commercial temperature range (0°C to 70°C). This specification is guaranteed in the datasheet and applies under no-load conditions with proper PCB layout and decoupling.
Can the LTC1445CN#PBF operate from a single 3.3V supply?
Yes, the LTC1445CN#PBF operates from a single 2V to 11V supply, making 3.3V fully compatible. At 3.3V, its push-pull outputs deliver VOH ≥ 2.9V and VOL ≤ 0.4V (at specified load), ensuring robust TTL/CMOS interfacing. Supply current remains ≤ 8.5µA across temperature.
How is hysteresis programmed on the LTC1445CN#PBF?
Hysteresis on the LTC1445CN#PBF is programmed by connecting two resistors: R1 between REF and HYST, and R2 between HYST and V–. The voltage difference (VREF – VHYST) sets the hysteresis band - doubling that difference gives the input hysteresis voltage. Maximum allowed difference is 50mV, yielding up to 100mV input hysteresis.
Does the LTC1445CN#PBF require external bypass capacitors?
The LTC1445CN#PBF requires a 0.1µF ceramic capacitor between V+ and GND (or V–) for stable operation. Its internal reference can drive up to 0.01µF directly without oscillation, but larger values (up to 100µF) are supported with a series damping resistor per Figure 1 in the datasheet. No additional output-stage bypassing is needed due to crowbar-current elimination.
Is the LTC1445CN#PBF pin-compatible with other members of the LTC1443/LTC1444/LTC1445 family?
Yes, the LTC1445CN#PBF shares identical pinout and package with LTC1443CN#PBF and LTC1444CN#PBF in PDIP, SO, and DFN variants. However, functional differences exist: LTC1443 has GND at Pin 14 and 1.182V reference; LTC1444 has HYST at Pin 14 and open-drain outputs; LTC1445 has HYST at Pin 14 and push-pull outputs - PCB design must match selected variant.
LTC1445CN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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):
- 50mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 16-PDIP
LTC1445CN#PBF FAQ
1.How can I place an order for LTC1445CN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1445CN#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 LTC1445CN#PBF reliable?
The price and inventory of LTC1445CN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1445CN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1445CN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1445CN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1445CN#PBF?
LTC1445CN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1445CN#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 LTC1445CN#PBF?
For technical support, including LTC1445CN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1445CN#PBF requirements.
6.How does Aetrix verify that LTC1445CN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1445CN#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 LTC1445CN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1445CN#PBF?
All LTC1445CN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1445CN#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 LTC1445CN#PBF part is unused and in its original packaging.
Return procedure for LTC1445CN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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