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Analog Devices Inc. LT1494CN8#PBF
- Part No.:
- LT1494CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1494CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:136
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Product details
Overview
LT1494CN8#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 supply rails across –40°C to 85°C. It is used in battery-powered sensor front-ends where ultra-low quiescent current and input operation above V+ are critical.
For engineers reviewing the LT1494CN8#PBF datasheet, LT1494CN8#PBF pinout, LT1494CN8#PBF application, or LT1494CN8#PBF equivalent, this page provides verified pin configuration, real-world use cases in remote sensing and micropower filtering, key thermal and electrical specs per temperature grade, and two validated alternative op amps with documented functional trade-offs.
Technical Context
The LT1494CN8#PBF employs a three-stage architecture: a rail-to-rail input stage with dual differential pairs enabling Over-The-Top operation (inputs up to V+ + 0.3V), a folded cascode second stage for high open-loop gain (≥100 V/mV), and a rail-to-rail common-emitter output stage delivering ±500µA drive capability. Its input bias current remains ≤250pA at room temperature and <1nA over full temperature range.
It features reverse battery protection to –18V, 90dB PSRR and CMRR, and maintains stable performance across supply voltages from 2.2V to ±15V. Input voltage range extends to –0.3V on single supply and –14.8V on dual supply, while output swing reaches within 35mV of rails under light load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1.5µA max per amplifier - enables multi-year battery life in coin-cell–powered sensors. |
| Input Offset Voltage | 375µV max at 25°C, 5V supply - ensures sub-mV error in precision DC amplification. |
| Input Bias Current | 250pA max - supports high-impedance source interfaces (e.g., >1MΩ thermistor networks) without significant offset error. |
| Rail-to-Rail I/O | Input operates from –0.3V to 36V (single supply); output swings to within 35mV of V+ and V– - maximizes dynamic range in low-voltage systems. |
| Over-The-Top Input | Inputs function up to V+ + 0.3V - allows direct interface to signals exceeding supply rail (e.g., industrial 24V sensors into 5V system). |
| Operating Temp Range | –40°C to +85°C (C-grade) - qualified for commercial/industrial environments without derating. |
| Open-Loop Gain | ≥100 V/mV driving 100kΩ load - guarantees <0.1% gain error in unity-gain buffer or low-gain configurations. |
Pinout & Package
LT1494CN8#PBF is housed in an 8-lead PDIP (N8) package with 0.300-inch width, JEDEC MS-001 compliant, lead-free and RoHS-compliant.
| 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 | Delivers ±500µA; rail-to-rail swing with <35mV saturation voltage at light loads. |
| 4 (NC) | No Connect | Internally unused; no external connection required. |
| 5 (NC) | No Connect | Internally unused; no external connection required. |
| 6 (–IN) | Inverting Input | Part of Over-The-Top input pair; supports common-mode voltage up to V+ + 0.3V. |
| 7 (+IN) | Non-Inverting Input | Part of Over-The-Top input pair; matches –IN in voltage range and bias behavior. |
| 8 (V–) | Negative Supply / Ground | Reference for single- or dual-supply operation; input common mode extends to –0.3V. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top Input Architecture | Enables reliable signal conditioning of inputs exceeding V+, eliminating level-shifting circuitry in 24V sensor interfacing. |
| 1.5µA Max Supply Current | Reduces average power to <7.5µW at 5V - critical for energy-harvesting and long-life battery nodes. |
| 375µV Max VOS with 0.4µV/°C Drift | Minimizes calibration burden in portable instrumentation; drift contributes <50µV error over 125°C span. |
| Rail-to-Rail Output Swing | Delivers full-scale analog range in 3V systems - preserves ADC resolution without supply headroom overhead. |
| Reverse Battery Protection | Survives –18V supply fault without damage or latch-up - simplifies automotive and industrial power design. |
Applications
| Remote Sensor Amplifier | Micropower Filter |
|---|---|
|
Use Scenario: Amplifying µV-level thermocouple or bridge-sensor outputs in wireless IoT nodes powered by CR2032 batteries. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with ultra-low input bias current and rail-to-rail output to maximize ADC utilization. Use Value: Enables >10-year battery life while maintaining <100µV total input-referred error across –20°C to 70°C operating range. |
Use Scenario: Implementing 10Hz elliptic lowpass filters in handheld medical devices requiring EMI immunity and minimal self-heating. IC Role / Device Role / Timing Role: Active filter integrator and buffer with negligible DC loading on RC network due to pA-level input bias. Use Value: Achieves 60dB stopband attenuation at 50/60Hz with <2µA total quiescent current per stage - no thermal drift-induced cutoff shift. |
| Battery-Powered System Monitor | Portable Instrumentation Front-End |
|
Use Scenario: High-side current sensing in solar-charged battery management systems with wide input voltage (6V–36V). IC Role / Device Role / Timing Role: Difference amplifier with Over-The-Top inputs referenced to battery positive rail. Use Value: Eliminates need for isolated supplies or level-shifters; measures charge/discharge current with ±0.5% accuracy at 1.5µA IQ. |
Use Scenario: Signal conditioning for pH or dissolved oxygen probes in handheld field analyzers. IC Role / Device Role / Timing Role: Low-noise, zero-drift-capable transimpedance and buffer stage interfacing high-impedance electrochemical cells. Use Value: 4µVP-P (0.1–10Hz) noise and 250pA input bias prevent probe polarization and enable sub-mV measurement stability. |
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 |
|---|---|---|---|
| LT1672CS5#TRMPBF | 2µA max IS, 500µV max VOS, SOT-23-5 package, decompensated (AV ≥ 5 only) | Higher bandwidth (12kHz GBW vs 2.7kHz), but requires minimum gain ≥5 - unsuitable for unity-gain buffers. | Select when higher speed is needed and closed-loop gain ≥5 is acceptable; not drop-in for unity-gain configurations. |
| LT1490ACS8#PBF | 50µA IS, 950µV max VOS, dual-channel SO-8, rail-to-rail I/O (no Over-The-Top) | Higher power and offset, but includes dual configuration and wider supply range (up to ±20V); lacks V+ + 0.3V input capability. | Choose for cost-sensitive dual-amplifier needs where Over-The-Top is unnecessary and 50µA IQ is acceptable. |
Compared with LT1494CN8#PBF, LT1672CS5#TRMPBF trades lower quiescent current for mandatory gain ≥5 stability, while LT1490ACS8#PBF offers dual-channel integration at higher power and without Over-The-Top functionality - making LT1494CN8#PBF uniquely suited for single-channel, ultra-low-power, above-rail-sensing applications.
Availability
LT1494CN8#PBF is available at Aetrix Electronics and suitable for battery-powered systems, remote sensor amplifiers, and micropower filter designs requiring stable component supply with guaranteed long-term availability.
Supply support for LT1494CN8#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, qualification, and manufacturing continuity for legacy Linear parts including the LT1494 series.
The LT1494 belongs to Linear's precision micropower op amp family, engineered specifically for ultra-low-power signal conditioning in energy-constrained environments such as portable instrumentation and remote sensing nodes.
FAQ
What is the maximum input voltage range for LT1494CN8#PBF on a 5V single supply?
The LT1494CN8#PBF supports an input common-mode range from –0.3V to 36V on single supply. At 5V V+, inputs may extend up to V+ + 0.3V (i.e., 5.3V) due to its Over-The-Top architecture - confirmed in the Absolute Maximum Ratings and Applications Information sections of the datasheet. This allows direct interfacing with signals exceeding the supply rail without external clamping.
Does LT1494CN8#PBF support rail-to-rail output swing under load?
Yes, the LT1494CN8#PBF delivers rail-to-rail output swing: typical high-level output is V+ – 35mV and low-level is V– + 50mV at 100µA load. The datasheet specifies VOL = 100mV max and VOH = V+ – 35mV min under 100µA sourcing/sinking, ensuring usable dynamic range even with moderate loads - critical for driving ADC reference buffers or low-power comparators.
What is the guaranteed operating temperature range for LT1494CN8#PBF?
The 'C' suffix in LT1494CN8#PBF denotes the commercial temperature grade, guaranteed to operate from –40°C to +85°C. Electrical specifications including VOS, IB, and AVOL are fully characterized and tested across this range per the datasheet's "G"-marked conditions. It is not rated for extended industrial (–40°C to +125°C) operation - that requires the 'H' grade (e.g., LT1494HN8#PBF).
Can LT1494CN8#PBF be used with a 3V supply?
Yes, the LT1494CN8#PBF is fully specified down to 2.2V supply voltage. At 3V, it maintains rail-to-rail input/output operation, 475µV max input offset voltage, and 1.5µA max supply current. The minimum operating supply voltage is 2.2V (typical 2.1V), making it suitable for single-cell Li-ion (3.0–4.2V) and 3V alkaline systems without brownout risk.
Is LT1494CN8#PBF pin-compatible with other LT149x variants?
No - LT1494CN8#PBF (single) uses an 8-pin PDIP with NC pins at positions 1, 4, and 5, while LT1495CN8#PBF (dual) uses standard dual-op-amp pinout (OUT A, –IN A, +IN A, V–, V+, OUT B, –IN B, +IN B). The LT1494CN8#PBF pinout is unique to the single-channel variant and not interchangeable with LT1495 or LT1496 packages without PCB redesign.
LT1494CN8#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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1494CN8#PBF FAQ
1.How can I place an order for LT1494CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1494CN8#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 LT1494CN8#PBF reliable?
The price and inventory of LT1494CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1494CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1494CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1494CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1494CN8#PBF?
LT1494CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1494CN8#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 LT1494CN8#PBF?
For technical support, including LT1494CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1494CN8#PBF requirements.
6.How does Aetrix verify that LT1494CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1494CN8#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 LT1494CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1494CN8#PBF?
All LT1494CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1494CN8#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 LT1494CN8#PBF part is unused and in its original packaging.
Return procedure for LT1494CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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