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Analog Devices Inc. LT1492CN8#PBF
- Part No.:
- LT1492CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1492CN8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,199
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Product details
Overview
LT1492CN8#PBF from Analog Devices (formerly Linear Technology) is a dual precision operational amplifier optimized for low-power, single-supply operation with 5MHz gain-bandwidth product, 3V/µs slew rate, and 450µA quiescent supply current per amplifier. It features 180µV max input offset voltage, rail-to-rail output swing to ground while sinking current, and operates from 2.5V to 36V total supply - ideal for battery-powered instrumentation and portable analog signal conditioning.
For engineers reviewing the LT1492CN8#PBF datasheet, LT1492CN8#PBF pinout, LT1492CN8#PBF application, or LT1492CN8#PBF equivalent, key selection criteria include its guaranteed 5MHz GBW at 3.3V/5V/±15V supplies, ±20mA minimum output drive, input voltage range extending 0.25V below V–, and specified performance over –40°C to 85°C without extended-temperature testing.
Technical Context
The LT1492CN8#PBF employs a bipolar input stage with internal biasing enabling true single-supply operation down to 2.5V total supply. Its input common-mode range includes ground and extends to within 1.2V of V+, while output swings to within 3mV of V– and 0.65V of V+ under no load - critical for precision DC-coupled circuits in 3.3V systems.
It delivers 20mA minimum output current per amplifier with open-loop gain ≥175 V/mV (RL = 2kΩ, VS = 5V), CMRR ≥86 dB, PSRR ≥90 dB, and low noise: 16.5nV/√Hz at 1kHz and 0.14pA/√Hz - supporting high-fidelity photodiode amplification and DAC I/V conversion where offset stability and low drift (≤3µV/°C) are essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 5MHz typical - enables stable unity-gain and moderate-gain configurations up to ~100kHz with phase margin >50° at 3.3V/5V supplies. |
| Slew Rate | 3V/µs typical - supports clean 100kHz full-scale sine output with ≤1% THD at 1VRMS into 2kΩ load. |
| Input Offset Voltage | 180µV maximum - eliminates need for external trimming in most 12-bit precision applications (e.g., sensor front-ends). |
| Supply Current per Amp | 450µA typical - allows dual-channel precision amplification in sub-1mA system power budgets. |
| Output Drive Current | ±20mA minimum - drives 100Ω loads directly without external buffers in active filter or current-source designs. |
| Input Noise Density | 16.5nV/√Hz at 1kHz - suitable for low-level photodiode signals where Johnson noise dominates. |
| Common-Mode Range | Includes ground and extends to V+ – 1.2V - enables direct interfacing with 0–3.3V sensors and microcontroller ADC references. |
Pinout & Package
LT1492CN8#PBF is housed in an 8-lead PDIP (N8) package with 0.300-inch body width, JEDEC MS-001 compliant, rated for 150°C junction temperature and θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Capable of sourcing/sinking ±20mA; swings to 3mV above V– and 0.65V below V+ with no load. |
| 2 (–IN A) | Inverting input A | High-impedance bipolar input; bias current ≤100nA; tolerates common-mode voltages down to 0.25V below V–. |
| 3 (+IN A) | Non-inverting input A | Matches –IN A characteristics; used for precision reference buffering and sensor excitation. |
| 4 (V–) | Negative supply rail | Ground reference in single-supply mode; must be bypassed with 0.01µF capacitor near pin. |
| 5 (V+) | Positive supply rail | Accepts 2.5V–36V total supply; requires local 0.01µF + optional 4.7µF bypass for heavy loads. |
| 6 (OUT B) | Amplifier B output | Electrically isolated from OUT A; shares same supply rails and thermal environment. |
| 7 (–IN B) | Inverting input B | Independent channel with identical specs to –IN A; supports dual-path signal processing. |
| 8 (+IN B) | Non-inverting input B | Enables differential pair configuration or independent sensor channel amplification. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation from 2.5V | Enables direct use with Li-ion (3.0–4.2V), 3.3V logic, and 5V systems without level-shifting circuitry. |
| Input voltage range includes ground | Permits direct connection of 0–3.3V sensor outputs without negative bias or level translation. |
| Output swings to ground while sinking current | Supports true rail-to-rail output in single-supply configurations driving loads to ground (e.g., current sinks). |
| Low input offset drift (≤3µV/°C) | Maintains calibration integrity across industrial temperature ranges without active compensation. |
| Wide supply range (2.5V–36V) | Allows reuse across multiple platforms - from portable 3.3V devices to industrial ±15V test equipment. |
Applications
| Battery-Powered Instrumentation | Photodiode Amplifiers |
|---|---|
Use Scenario: Portable gas analyzer using electrochemical sensors with mV-level output requiring low-drift amplification and 12-bit ADC interface. IC Role / Device Role / Timing Role: Dual-channel precision op amp providing sensor signal conditioning and reference buffer in 3.3V battery-powered system. Use Value: 180µV max VOS and 3µV/°C drift ensure <0.5% measurement error over –20°C to 60°C without recalibration. | Use Scenario: Low-light optical detection in medical pulse oximeter with transimpedance gain >1MΩ. IC Role / Device Role / Timing Role: Transimpedance amplifier with low input bias current (≤100nA) and 16.5nV/√Hz noise density. Use Value: Enables sub-picoamp photocurrent resolution while maintaining bandwidth >100kHz via 5MHz GBW. |
| DAC Current-to-Voltage Conversion | Active Filters |
Use Scenario: Industrial PLC analog output module converting 0–20mA DAC current to 0–10V voltage with 0.1% accuracy. IC Role / Device Role / Timing Role: Precision I/V converter with ±20mA output drive capability and low offset to minimize zero-error. Use Value: 180µV VOS contributes <0.0018% full-scale error at 10V range; 20mA drive supports 500Ω loop impedance. | Use Scenario: Anti-aliasing filter in 100kHz data acquisition system with Butterworth response and minimal passband ripple. IC Role / Device Role / Timing Role: Dual op amp implementing 4th-order Sallen-Key topology with matched GBW and low distortion. Use Value: 0.005% THD at 1VRMS ensures clean digitization; 5MHz GBW supports stable 100kHz cutoff design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1366CS8#PBF | Rail-to-rail input/output, lower GBW (400kHz), higher supply current (520µA), 475µV VOS max | Better for ultra-low-voltage (±1.25V) rail-to-rail sensing; less suitable for >50kHz signal paths | Select when input/output swing beyond supply rails is required and bandwidth <500kHz suffices. |
| LT1212CS8#PBF | Higher speed (14MHz GBW, 7V/µs), higher supply current (1.8mA), 275µV VOS max, same pinout | Preferred for fast-settling active filters or wideband sensor interfaces needing >5MHz bandwidth | Choose when LT1492CN8#PBF's 5MHz GBW limits dynamic performance but pin compatibility is retained. |
Compared with LT1366CS8#PBF, LT1492CN8#PBF offers 12× higher bandwidth and 2.5× lower offset at half the supply current; versus LT1212CS8#PBF, it trades 2.8× bandwidth for 4× lower quiescent power and better DC precision - making it optimal for battery-constrained, medium-speed precision analog stages.
Availability
LT1492CN8#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode amplification, and DAC current-to-voltage conversion requiring stable component supply and long-term production continuity.
Supply support for LT1492CN8#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, documentation, and manufacturing continuity for legacy Linear parts including the LT1492 series.
The LT1492 product line was designed specifically for low-power, single-supply precision analog signal conditioning in portable and industrial systems where DC accuracy, supply flexibility, and output drive coexist within tight power budgets.
FAQ
What is the minimum operating supply voltage for LT1492CN8#PBF?
The LT1492CN8#PBF is fully functional with 2.1V total supply and guaranteed to operate down to 2.5V per the PSRR specification. Below 2.5V, input common-mode range and phase margin degrade significantly - for reliable operation in 3.3V or 5V systems, LT1492CN8#PBF performs optimally across its full specified range of 2.5V to 36V.
Does LT1492CN8#PBF support true rail-to-rail input operation?
No - LT1492CN8#PBF inputs include ground and extend to within 1.2V of V+, but do not reach the positive rail. Its input common-mode range is specified as 0V to V+ – 1.2V (at room temperature), making it suitable for single-supply systems with grounded sensors but not for applications requiring full rail-to-rail input swing like the LT1366. LT1492CN8#PBF prioritizes precision and low noise over input voltage range.
Can LT1492CN8#PBF drive capacitive loads without oscillation?
LT1492CN8#PBF is stable with moderate capacitive loads (<100pF) under light loading, but large capacitive loads (>1nF) require isolation resistors or feedback compensation. The device's internal compensation targets low-voltage, low-current operation - driving cables or ADC input capacitance directly may cause peaking or instability. For 1000pF loads, add a 10–50Ω series resistor at the output and verify phase margin with simulation or bench testing using LT1492CN8#PBF.
What is the thermal resistance (θJA) of the LT1492CN8#PBF N8 package?
The LT1492CN8#PBF in the 8-lead PDIP (N8) package has a junction-to-ambient thermal resistance (θJA) of 130°C/W, as confirmed in the Absolute Maximum Ratings table. This value assumes standard JEDEC 2S2P board conditions; actual thermal performance depends on PCB copper area, airflow, and nearby heat sources. For continuous 20mA output into 100Ω at ±15V, power dissipation exceeds 100mW - thermal design must ensure TJ remains below 150°C using LT1492CN8#PBF's θJA specification.
Is LT1492CN8#PBF suitable for comparator applications?
Yes, LT1492CN8#PBF can be used as a comparator on single 3.3V or 5V supplies due to rail-to-ground output swing and TTL/CMOS-compatible logic levels, but it is not optimized for speed: propagation delay is ~100ns and response time increases sharply with low overdrive (<10mV). For robust comparator operation, add 20mV hysteresis via positive feedback. LT1492CN8#PBF's primary design intent remains precision amplification - use dedicated comparators for timing-critical applications.
LT1492CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- 5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 45 nA
- Voltage - Input Offset:
- 120 µV
- Current - Supply:
- 500µA (x2 Channels)
- Current - Output / Channel:
- 55 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1492CN8#PBF FAQ
1.How can I place an order for LT1492CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1492CN8#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 LT1492CN8#PBF reliable?
The price and inventory of LT1492CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1492CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1492CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1492CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1492CN8#PBF?
LT1492CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1492CN8#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 LT1492CN8#PBF?
For technical support, including LT1492CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1492CN8#PBF requirements.
6.How does Aetrix verify that LT1492CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1492CN8#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 LT1492CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1492CN8#PBF?
All LT1492CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1492CN8#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 LT1492CN8#PBF part is unused and in its original packaging.
Return procedure for LT1492CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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