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Analog Devices Inc. LT1494IN8#PBF
- Part No.:
- LT1494IN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1494IN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:176
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Product details
Overview
LT1494IN8#PBF from Analog Devices (formerly Linear Technology) is a single-channel, micropower, precision rail-to-rail input and output operational amplifier with Over-The-Top™ input capability. It delivers 1.5µA max supply current, 375µV max input offset voltage, and operates from 2.2V to 36V supplies across –40°C to 125°C. It enables high-accuracy signal conditioning in battery-powered remote sensors and low-voltage industrial monitoring systems.
For engineers reviewing the LT1494IN8#PBF datasheet, LT1494IN8#PBF pinout, LT1494IN8#PBF application, or LT1494IN8#PBF equivalent, key selection criteria include its guaranteed 125°C operation, reverse-battery protection to –18V, rail-to-rail I/O swing, sub-250pA input bias current, and verified Over-The-Top input functionality above V+.
Technical Context
The LT1494IN8#PBF employs a three-stage architecture: a rail-to-rail input stage with dual differential pairs enabling Over-The-Top operation (inputs > V+), a folded-cascode second stage for high open-loop gain (≥100 V/mV), and a rail-to-rail common-emitter output stage supporting ±500µA load current.
Its input stage dynamically switches between NPN and PNP pairs based on common-mode voltage, maintaining precision while extending input range beyond V+. The device achieves 90dB PSRR and CMRR at DC, with stable operation under capacitive loads up to 100pF at unity gain when output is biased near mid-supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1.5µA max per amplifier - enables multi-year battery life in always-on sensor nodes. |
| Input Offset Voltage | 375µV max at 25°C - ensures ≤0.0075% gain error in 5V full-scale instrumentation amplifiers. |
| Input Bias Current | 250pA max - permits use of >1MΩ source resistors without significant offset error. |
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive and industrial control environments. |
| Rail-to-Rail I/O | Input range: –0.3V to 36V; Output swing: within 35mV of rails - maximizes dynamic range in single-supply systems. |
| Reverse Battery Protection | Withstands –18V applied to V– - eliminates need for external protection diodes in 12V/24V battery systems. |
| Open-Loop Gain | 100 V/mV min driving 100kΩ - guarantees <0.1% closed-loop gain error at G=100 with typical feedback networks. |
Pinout & Package
LT1494IN8#PBF is housed in an 8-lead PDIP (N8) package with 0.300-inch width, 0.100-inch lead pitch, and through-hole mounting. Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unused; must be left floating or tied to ground per layout best practice. |
| 2 (V+) | Positive Supply | Accepts 2.2V to 36V; reverse-battery protected to –18V. |
| 3 (OUT) | Amplifier Output | Source/sink capable of ±500µA; rail-to-rail swing supports low-headroom designs. |
| 4 (NC) | No Connect | Internally unused; no electrical function. |
| 5 (NC) | No Connect | Internally unused; no electrical function. |
| 6 (–IN) | Inverting Input | Part of Over-The-Top input pair; operates up to V+ + 0.3V with controlled bias current. |
| 7 (+IN) | Non-Inverting Input | Part of Over-The-Top input pair; same extended common-mode range as –IN. |
| 8 (V–) | Negative Supply | Reference for dual-supply operation; accepts –18V to +36V relative to V+. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top™ Input | Inputs operate up to 0.3V above V+, enabling direct sensing of V+ referenced signals without level-shifting. |
| Micropower Operation | 1.5µA max supply current allows integration into energy-harvesting and coin-cell powered systems. |
| Precision DC Performance | 375µV max VOS, 20pA max IOS, and 0.4µV/°C typical drift support stable long-term measurements. |
| Rail-to-Rail Input/Output | Full 36V input range and output swing within 35mV of rails maximize usable signal range in single-supply applications. |
| High PSRR/CMRR | 90dB minimum PSRR and CMRR ensure immunity to supply noise and common-mode interference in noisy industrial settings. |
Applications
| Battery-Powered Sensor Node | Remote Industrial Current Monitor |
|---|---|
Use Scenario: Continuous temperature and humidity sensing in wireless IoT node powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Precision front-end amplifier for thermistor and capacitive humidity sensor outputs, operating from 2.7V supply. Use Value: 1.5µA quiescent current extends battery life beyond 5 years; rail-to-rail I/O captures full sensor range without external level shifters. | Use Scenario: High-side current sensing in 24V PLC analog input module with isolated power. IC Role / Device Role / Timing Role: Differential amplifier for shunt-based current measurement, rejecting common-mode voltage up to 24V. Use Value: Over-The-Top inputs tolerate VSENSE+ = 24.3V while V+ = 24V, eliminating need for costly level-shifting circuitry. |
| Low-Voltage Medical Instrumentation | Automotive Cabin Environment Monitor |
Use Scenario: Signal conditioning for ECG electrode interface in portable patient monitor running from 3.3V LDO. IC Role / Device Role / Timing Role: First-stage amplifier with ultra-low input bias current to prevent electrode polarization errors. Use Value: 250pA max input bias current minimizes DC offset drift from high-impedance dry electrodes. | Use Scenario: CO₂ and VOC sensor signal amplification in automotive HVAC control unit exposed to under-dash temperatures. IC Role / Device Role / Timing Role: Precision buffer and gain stage for NDIR sensor outputs in –40°C to +125°C ambient. Use Value: Guaranteed 125°C operation and 375µV max VOS ensure calibration stability over full vehicle lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1672CS8#PBF | 2µA max supply current; decompensated (AV ≥ 5 only); 12kHz GBW vs 2.7kHz; same Over-The-Top architecture. | Requires minimum gain ≥5; unsuitable for unity-gain buffers or integrators. | Select when higher speed and gain-stability trade-off are acceptable for fixed-gain signal chains. |
| LT1782IS5#TRMPBF | SOT-23-5 package; 55µA supply current; 800µV max VOS; includes shutdown pin; no Over-The-Top capability. | Lacks input extension above V+; higher power; smaller footprint. | Select when board space is critical and Over-The-Top operation is not required. |
Compared with LT1672CS8#PBF and LT1782IS5#TRMPBF, the LT1494IN8#PBF uniquely combines guaranteed 125°C operation, true Over-The-Top inputs, and sub-2µA supply current-making it irreplaceable for ultra-low-power, high-voltage-range sensing where gain flexibility and thermal robustness are mandatory.
Availability
LT1494IN8#PBF is available at Aetrix Electronics and suitable for battery-powered sensor nodes, remote industrial current monitors, and low-voltage medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1494IN8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1494IN8#PBF belongs to ADI's legacy Linear Technology precision op amp portfolio, designed specifically for ultra-low-power, high-accuracy signal conditioning in harsh environments where supply constraints and extended temperature operation are critical.
FAQ
What is the maximum operating temperature specification for LT1494IN8#PBF?
The LT1494IN8#PBF is rated for continuous operation from –40°C to +125°C and is fully specified and guaranteed over this extended industrial temperature range. This makes LT1494IN8#PBF suitable for under-hood automotive, industrial control, and outdoor sensor applications where ambient temperatures exceed standard commercial limits.
Does LT1494IN8#PBF support rail-to-rail input operation above the positive supply voltage?
Yes, LT1494IN8#PBF features Over-The-Top™ input architecture that allows both inputs to operate up to 0.3V above V+, enabling direct sensing of signals referenced to the positive rail without external level-shifting components. This capability is explicitly confirmed in the datasheet's "Input" section and typical performance curves.
What is the typical input bias current of LT1494IN8#PBF at room temperature?
The typical input bias current of LT1494IN8#PBF is 250pA at 25°C, with a maximum of 1000pA across the full –40°C to +125°C range. This ultra-low value allows LT1494IN8#PBF to interface directly with high-impedance sources such as thermistors, pH electrodes, and piezoelectric sensors without introducing significant offset errors.
Can LT1494IN8#PBF be used with a single 3.3V supply?
Yes, LT1494IN8#PBF operates reliably from a single 3.3V supply, meeting all key specifications including 375µV max input offset voltage and rail-to-rail input/output swing. Its minimum operating supply voltage is 2.2V, making LT1494IN8#PBF ideal for modern low-voltage microcontroller-based systems.
Is LT1494IN8#PBF pin-compatible with other members of the LT1494/LT1495/LT1496 family?
No, LT1494IN8#PBF is a single-amplifier device in 8-lead PDIP (N8) package with NC pins at positions 1, 4, and 5. It is not pin-compatible with the dual LT1495 or quad LT1496 variants, nor with MSOP or SO packages of the same family. Pin compatibility must be verified per package drawing and ordering part number.
LT1494IN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Over-The-Top®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.001V/µs
- Gain Bandwidth Product:
- 2.7 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 25 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 1.4µA
- Current - Output / Channel:
- 1.5 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1494IN8#PBF FAQ
1.How can I place an order for LT1494IN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1494IN8#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 LT1494IN8#PBF reliable?
The price and inventory of LT1494IN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1494IN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1494IN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1494IN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1494IN8#PBF?
LT1494IN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1494IN8#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 LT1494IN8#PBF?
For technical support, including LT1494IN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1494IN8#PBF requirements.
6.How does Aetrix verify that LT1494IN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1494IN8#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 LT1494IN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1494IN8#PBF?
All LT1494IN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1494IN8#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 LT1494IN8#PBF part is unused and in its original packaging.
Return procedure for LT1494IN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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