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Analog Devices Inc. LTC1442IS8#TRPBF
- Part No.:
- LTC1442IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1442IS8#TRPBF.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:937
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Product details
Overview
LTC1442IS8#TRPBF from Analog Devices (formerly Linear Technology) is an ultralow-power dual comparator with integrated 1.182 V ±1% precision reference, programmable hysteresis via HYST pin, and rail-to-rail CMOS outputs capable of sourcing 40 mA. It operates from a single 2 V to 11 V supply or dual ±1 V to ±5.5 V supplies and draws only 3.5–5.7 µA over temperature. It is used in battery-powered voltage monitoring, threshold detection, and window comparator circuits where micropower operation and stable internal reference are critical.
For engineers reviewing the LTC1442IS8#TRPBF datasheet, LTC1442IS8#TRPBF pinout, LTC1442IS8#TRPBF application, or LTC1442IS8#TRPBF equivalent, key selection criteria include guaranteed input common-mode range (V– to V+ –1.3 V), hysteresis configurability, reference output drive capability (up to 0.01 µF bypass capacitor), propagation delay (12–15 µs at 10 mV overdrive), and industrial temperature grade (–40°C to +85°C).
Technical Context
The LTC1442IS8#TRPBF integrates two independent comparators sharing a single precision bandgap reference and hysteresis control node. Its architecture eliminates crowbar current during output transitions, minimizing supply glitches-critical for low-noise, battery-sensitive systems. The reference is referenced to V– and maintains ±1% accuracy across –40°C to +85°C.
Each comparator features picoamp-level input leakage (±10 pA typ), wide input common-mode range extending to within 1.3 V of V+, and TTL/CMOS-compatible outputs that swing fully from V– to V+. Hysteresis is implemented externally using two resistors between REF, HYST, and V–, enabling precise threshold band tuning up to 100 mV total.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single: 2 V to 11 V; Dual: ±1 V to ±5.5 V - supports direct integration into 3.3 V, 5 V, and split-supply sensor interfaces. |
| Quiescent Current | 3.5–5.7 µA (–40°C to +85°C) - enables multi-year operation on coin-cell batteries in always-on monitoring. |
| Reference Voltage | 1.182 V ±1% (–40°C to +85°C) - provides stable, factory-trimmed threshold without external components. |
| Propagation Delay | 12–15 µs (10 mV overdrive, COUT = 100 pF) - suitable for slow-varying signals like battery voltage or temperature thresholds. |
| Input Offset Voltage | ±3 mV (max, full temp range) - ensures reliable detection of small differential voltages in precision level sensing. |
| Output Drive | Sources 40 mA / sinks 5 mA - directly drives LEDs, logic inputs, or small MOSFET gates without buffer stages. |
| Reference Load Capability | Drives 0.01 µF capacitor without oscillation - simplifies noise filtering and eliminates need for external op-amp buffers. |
Pinout & Package
Package: 8-lead plastic SO (S8), 150 mil width, RoHS-compliant, lead-free (PBF), tape-and-reel (#TRPBF). Pin 1 marked by notch or dot; exposed pad not present (unlike DFN variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT A | Comparator A output | CMOS rail-to-rail output swinging from V– to V+; sources 40 mA, sinks 5 mA. |
| 2: V– | Negative supply | Reference point for internal reference and comparator inputs; connects to ground in single-supply mode. |
| 3: IN A+ | Noninverting input A | Accepts signals from V– to V+ – 1.3 V; input leakage < ±10 pA enables high-impedance sensing. |
| 4: IN B– | Inverting input B | Dedicated inverting input for comparator B; shares same common-mode and leakage specs as IN A+. |
| 5: HYST | Hysteresis control | Accepts voltage from REF – 50 mV to REF; sets hysteresis band via resistor divider to V–. |
| 6: REF | Reference output | 1.182 V ±1% referenced to V–; drives capacitive loads ≤0.01 µF without instability. |
| 7: V+ | Positive supply | Primary power rail; bypassing with 0.1 µF recommended if source impedance >1 Ω or load >1 mA. |
| 8: OUT B | Comparator B output | Independent CMOS output identical in specs to OUT A; enables dual-threshold or window configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable hysteresis | Hysteresis band set externally via two resistors (REF → HYST → V–); max 100 mV total, eliminating false triggering in noisy environments. |
| Rail-to-rail CMOS outputs | Outputs swing fully from V– to V+ with 40 mA source capability - directly interface with microcontroller GPIOs or discrete FET drivers. |
| Zero-crowbar switching | No cross-conducting current during logic transitions - prevents supply rail disturbance critical in mixed-signal or RF-adjacent designs. |
| Wide input common-mode range | V– to V+ – 1.3 V - supports direct sensing of signals near ground or high-side rails without level-shifting circuitry. |
| Stable reference with capacitive drive | Internal 1.182 V reference drives 0.01 µF bypass cap without oscillation - reduces component count and PCB area vs. discrete reference + buffer solutions. |
Applications
| Battery Voltage Monitor | Low-Power Window Comparator |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage (2.5 V–4.2 V) to trigger low-battery warning and overvoltage shutdown in portable medical devices. IC Role / Device Role / Timing Role: LTC1442IS8#TRPBF uses one comparator to detect under-voltage (e.g., <3.0 V) and the other for over-voltage (e.g., >4.1 V), both referenced to its internal 1.182 V. Use Value: Eliminates need for external voltage dividers and reference ICs; quiescent current <6 µA extends battery life beyond 5 years in sleep mode. | Use Scenario: Detecting valid sensor output range (e.g., 0.5 V–2.0 V) from a thermistor-based temperature transducer in industrial IoT nodes. IC Role / Device Role / Timing Role: LTC1442IS8#TRPBF configures comparator A for lower threshold and comparator B for upper threshold, with shared REF and independent HYST pins. Use Value: Programmable hysteresis prevents chatter near trip points; dual comparators in one SO-8 package reduce board space by 40% vs. discrete solutions. |
| Micropower Threshold Detector | Glitch-Free Level Shifter |
Use Scenario: Detecting power-good status in energy-harvesting systems where supply ramps slowly from 1.8 V to 3.3 V. IC Role / Device Role / Timing Role: LTC1442IS8#TRPBF comparator A compares rising V+ against REF via resistor divider; HYST pin adds 20 mV hysteresis to prevent oscillation during ramp. Use Value: Operates down to 2 V supply; no crowbar current ensures clean logic transition even with high-impedance supply sources. | Use Scenario: Converting analog sensor output (0–1.2 V) to 3.3 V logic levels for MCU ADC enable control in automotive cabin sensors. IC Role / Device Role / Timing Role: LTC1442IS8#TRPBF uses REF as stable 1.182 V threshold; comparator output drives 3.3 V-tolerant GPIO with full rail swing. Use Value: Input common-mode range includes ground, enabling direct connection of 0 V–1.2 V signals without level-shifting resistors or op-amps. |
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#TRPBF | Same functionality and pinout, but commercial temperature range (0°C to 70°C) vs. industrial (–40°C to +85°C). | Not suitable for automotive or outdoor industrial deployments requiring extended temperature operation. | Select LTC1442IS8#TRPBF when operating ambient exceeds 70°C or drops below 0°C. |
| LT6700-2IMS8#PBF | 0.4 V reference (not 1.182 V); open-drain outputs; higher supply current (16 µA); different pinout (no HYST pin). | Requires external pull-up and level translation; better suited for ultra-low-voltage (1.4 V) systems, not direct replacement. | Choose LT6700-2IMS8#PBF only when reference voltage must be sub-1 V and open-drain logic is acceptable. |
Compared with LTC1442CS8#TRPBF, the LTC1442IS8#TRPBF guarantees performance across –40°C to +85°C, making it essential for harsh environments; versus LT6700-2IMS8#PBF, it offers higher reference voltage, push-pull outputs, lower quiescent current, and hysteresis configurability-enabling simpler, more robust threshold detection without external components.
Availability
LTC1442IS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, ultralow-power threshold detectors, and industrial window comparator applications requiring stable component supply and long-term lifecycle support.
Supply support for LTC1442IS8#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 full product continuity, technical documentation, and manufacturing for legacy Linear parts including the LTC1442 series.
The LTC1442 belongs to Linear's micropower comparator family designed specifically for energy-constrained applications such as portable instrumentation, remote sensors, and battery-backed systems where sub-6 µA quiescent current and integrated precision reference are mandatory.
FAQ
What is the operating temperature range of the LTC1442IS8#TRPBF?
The LTC1442IS8#TRPBF is rated for industrial temperature operation from –40°C to +85°C. This is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, where all "●"-marked specifications apply across this full range. The "I" suffix in the part number explicitly denotes the industrial grade.
Can the LTC1442IS8#TRPBF drive a 0.01 µF capacitor directly on its REF pin?
Yes, the LTC1442IS8#TRPBF reference output is specifically characterized to drive up to 0.01 µF capacitive loads without oscillation. This capability is stated in the Features list, Applications Information section, and Typical Performance Characteristics (Figure G11–G13), enabling stable reference filtering without external buffering.
Does the LTC1442IS8#TRPBF have a dedicated ground pin?
No, the LTC1442IS8#TRPBF does not include a dedicated GND pin. Unlike the LTC1440 (which has GND on Pin 1), the LTC1442 uses Pin 2 as V–, which serves as the reference for both the internal bandgap and comparator inputs/outputs. In single-supply operation, V– is connected to system ground.
What is the maximum hysteresis voltage band achievable with the LTC1442IS8#TRPBF?
The maximum hysteresis voltage band for the LTC1442IS8#TRPBF is 100 mV total (50 mV above and below the threshold). This is derived from the HYST pin's specified input voltage range of REF – 50 mV to REF, and the fact that hysteresis band equals twice the REF–HYST differential. The datasheet confirms this limit in the Pin Functions and Applications Information sections.
Is the LTC1442IS8#TRPBF pin-compatible with MAX922 or MAX923 comparators?
No, the LTC1442IS8#TRPBF is not pin-compatible with MAX922 or MAX923. While the datasheet notes the LTC1440 is pin-compatible with MAX921/922/923, the LTC1442 has a different pinout (e.g., IN B– on Pin 4, HYST on Pin 5, REF on Pin 6), whereas MAX922/MAX923 use different assignments (e.g., REF on Pin 8). Direct substitution requires PCB redesign.
LTC1442IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- with Voltage Reference
- 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):
- 50mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LTC1442IS8#TRPBF FAQ
1.How can I place an order for LTC1442IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1442IS8#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 LTC1442IS8#TRPBF reliable?
The price and inventory of LTC1442IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1442IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1442IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1442IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1442IS8#TRPBF?
LTC1442IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1442IS8#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 LTC1442IS8#TRPBF?
For technical support, including LTC1442IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1442IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1442IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1442IS8#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 LTC1442IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1442IS8#TRPBF?
All LTC1442IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1442IS8#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 LTC1442IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1442IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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