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Texas Instruments LPC662AIMX
- Part No.:
- LPC662AIMX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LPC662AIMX.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,945
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Product details
Overview
LPC662AIMX from Texas Instruments (formerly National Semiconductor) is a low-power CMOS dual operational amplifier optimized for single-supply operation from +5 V to +15 V. It delivers rail-to-rail output swing, ultra-low input bias current (2 fA), 3 mV input offset voltage, and 0.11 V/µs slew rate - enabling precision signal conditioning in battery-powered sensor interfaces and high-impedance analog front-ends.
For engineers reviewing the LPC662AIMX datasheet, LPC662AIMX pinout, LPC662AIMX application, or LPC662AIMX equivalent, this device is selected for micropower (<0.5 mW), high-voltage-gain (120 dB), wide common-mode input range (including ground), and stable operation into 5 kΩ loads - critical for current-to-voltage conversion, long-term integration, and active filtering in industrial and medical instrumentation.
Technical Context
The LPC662AIMX uses an unconventional topology where the output is taken directly from the integrator stage - bypassing a traditional unity-gain buffer - to achieve rail-to-rail swing while maintaining stability into 500 Ω loads. Its compound integrator includes dual feed-forward paths (Cf and Cff) and a push-pull output stage that supports both sourcing and sinking with asymmetric gain behavior (higher sinking gain at ≥5 kΩ).
This architecture enables ultra-low input bias current (2 fA typ.) and input common-mode range extending to ground, but requires careful PCB layout (e.g., guard rings) and capacitive-load compensation (e.g., series output resistor + feedback capacitor) to preserve stability - especially in unity-gain follower configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +4.75 V to +15.5 V - supports single-supply operation down to 5 V logic rails and up to industrial 15 V systems. |
| Input Bias Current | 2 fA typical - enables use with >1 GΩ source impedances without significant error (e.g., photodiode, piezoelectric sensors). |
| Input Offset Voltage | 3 mV max - ensures ≤3 mV baseline error in precision DC-coupled amplifiers without trimming. |
| Rail-to-Rail Output Swing | Within 60 mV of rails (at 100 kΩ load, V+ = 5 V) - maximizes dynamic range in low-voltage single-supply systems. |
| Slew Rate | 0.11 V/µs - sufficient for <1 kHz small-signal bandwidth in unity-gain buffers and integrators. |
| Open-Loop Gain | 120 dB into 100 kΩ - provides ≥1000 V/V loop gain for accurate closed-loop gain setting with 0.1% error. |
| Power Consumption | 86 µA per amplifier (typ.) - total <0.5 mW at 5 V - extends battery life in portable instrumentation. |
Pinout & Package
Package: 8-pin SOIC (Small Outline Integrated Circuit), JEDEC MS-012, body width 3.9 mm, lead pitch 1.27 mm, RoHS-compliant matte tin (Sn) finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amplifier A) | High-impedance node requiring guard ring layout; accepts input common-mode down to ground. |
| 2 | Non-Inverting Input (Amplifier A) | Same high-Z characteristics as Pin 1; used for follower, summing, or differential configurations. |
| 3 | Output (Amplifier A) | Rail-to-rail capable; limited to ±18 mA output current; requires series R + feedback C for >100 pF capacitive loads. |
| 4 | V− (Ground / Negative Supply) | Reference for single-supply operation; must be low-impedance; connects to system ground plane. |
| 5 | Non-Inverting Input (Amplifier B) | Independent input for second channel; identical specs and layout requirements as Pin 2. |
| 6 | Inverting Input (Amplifier B) | Independent input for second channel; identical specs and layout requirements as Pin 1. |
| 7 | Output (Amplifier B) | Independent rail-to-rail output; same drive capability and stability constraints as Pin 3. |
| 8 | V+ (Positive Supply) | Accepts 4.75–15.5 V; decoupling capacitor (0.1 µF ceramic) required within 5 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Enables full utilization of supply voltage headroom in single-supply data acquisition systems. |
| Ultra-low input bias current (2 fA) | Permits direct interfacing with high-impedance sources (e.g., pH electrodes, piezoelectric transducers) without guard-driven buffers. |
| Micropower operation (<0.5 mW) | Supports always-on sensing nodes powered by coin cells or energy harvesters with multi-year battery life. |
| Input common-mode range includes ground | Allows direct connection of grounded sensors (e.g., thermocouples, strain gauges) without level-shifting circuitry. |
| Specified for 5 kΩ and 100 kΩ loads | Guarantees performance into standard precision resistor networks and legacy industrial I/O modules. |
Applications
| High-Impedance Buffer | Precision Current-to-Voltage Converter |
|---|---|
Use Scenario: Amplifying signals from pH electrodes, ion-selective membranes, or MEMS microphones with source impedances >100 MΩ. IC Role / Device Role: Unity-gain voltage follower isolating high-Z sensor from downstream circuitry while preserving signal integrity. Use Value: 2 fA input bias current prevents >10 mV error across 100 MΩ source impedance - eliminating need for chopper-stabilized alternatives. |
Use Scenario: Converting photodiode or leakage current (pA–nA range) into measurable voltage for optical sensing or radiation detection. IC Role / Device Role: Transimpedance amplifier with low input offset and near-zero bias current to minimize dark-current-induced drift. Use Value: 3 mV VOS and 1.3 µV/°C drift ensure <10 µV output error over 0–70°C - critical for calibrated low-light measurement. |
| Long-Term Integrator | Active Filter |
Use Scenario: Building analog integrators for charge accumulation in energy metering or time-domain signal averaging over seconds to minutes. IC Role / Device Role: Precision op-amp in integrator configuration with ultra-low input bias current to minimize integration drift. Use Value: 2 fA bias current contributes only ~0.7 nC error after 1000 s integration - enabling sub-0.1% accuracy in metering applications. |
Use Scenario: Implementing 10 Hz bandpass, high-pass, or low-pass filters in portable ECG or environmental monitoring front-ends. IC Role / Device Role: Dual-channel op-amp providing gain, pole placement, and rail-to-rail output swing in Sallen-Key or multiple-feedback topologies. Use Value: 120 dB open-loop gain ensures filter Q and center frequency remain stable across temperature and supply variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L2CDR | Higher input offset (10 mV max), higher bias current (0.6 pA), lower slew rate (0.03 V/µs); SOIC-8, same pinout. | Less suitable for sub-mV precision or pA-level current sensing; acceptable for general-purpose low-power buffering. | Select when cost sensitivity outweighs ultra-low VOS or IB requirements; verify stability with capacitive loads. |
| LPV521MG/NOPB | Lower supply current (320 nA), lower VOS (1.25 mV), but narrower supply range (1.6–5.5 V); SC70-5, not pin-compatible. | Optimized for ultra-low-power sub-2 V systems (e.g., wearables); incompatible with 12 V or 15 V supplies. | Choose only for battery-powered <3.3 V designs requiring lowest possible quiescent current; redesign PCB for SC70 footprint. |
Compared with TLC27L2CDR and LPV521MG/NOPB, the LPC662AIMX uniquely balances rail-to-rail output, 2 fA bias current, and 5–15 V operation - making it irreplaceable in industrial single-supply sensor interfaces where supply headroom and input impedance are non-negotiable.
Availability
LPC662AIMX is available at Aetrix Electronics and suitable for high-impedance buffering, precision current-to-voltage conversion, and active filtering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LPC662AIMX 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
Texas Instruments acquired National Semiconductor in 2011 and maintains its precision analog portfolio, including legacy high-performance op-amps designed for industrial reliability and metrology-grade accuracy.
The LPC662AIMX belongs to National's low-power CMOS op-amp family, engineered specifically for single-supply, high-input-impedance applications in instrumentation, medical sensors, and portable test equipment where micropower and rail-to-rail operation are essential.
FAQ
What is the maximum operating supply voltage for the LPC662AIMX?
The LPC662AIMX has an absolute maximum supply voltage of 16 V (V+ − V−), with guaranteed operation from +4.75 V to +15.5 V. Exceeding 15.5 V risks violating the Absolute Maximum Ratings and may cause permanent damage. For reliable long-term use, maintain supply within the Operating Ratings range and include appropriate decoupling.
Does the LPC662AIMX support true rail-to-rail input common-mode range?
No - the LPC662AIMX supports rail-to-rail *output* swing, but its input common-mode range extends to ground (V−) and up to V+ − 1.9 V (typ.) at 25°C. This allows ground-referenced inputs but does not include the positive rail. The input stage is CMOS-based and optimized for single-supply use with grounded sensors, not full rail-to-rail input.
Can the LPC662AIMX drive capacitive loads without oscillation?
The LPC662AIMX is not inherently stable into pure capacitive loads. Oscillation risk increases above ~100 pF, especially in unity-gain follower configurations. To ensure stability, add a 50–100 Ω series resistor at the output and a 5–10 pF capacitor from inverting input to output - as documented in the Application Hints section of the SNOS555B datasheet.
What is the thermal resistance (θJA) of the LPC662AIMX in SOIC package?
The LPC662AIMX in 8-pin SOIC (package code D) has a thermal resistance θJA of 165°C/W, as specified in the datasheet for standard JEDEC 2-layer board mounting. This value assumes proper PCB copper pour and thermal vias; actual junction temperature must stay below 150°C under worst-case power dissipation and ambient conditions.
Is the LPC662AIMX pin-compatible with other members of the LPC66x family?
Yes - the LPC662AIMX shares identical 8-pin SOIC pinout with LPC662IMX/NOPB, LPC662AIM/NOPB, and LPC662IM/NOPB. All variants differ only in temperature grade (AI = −40°C to +85°C) and packaging (tube vs. tape-and-reel), not electrical function or pin assignment. No PCB changes are needed when substituting within the same package type.
LPC662AIMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 0.11V/µs
- Gain Bandwidth Product:
- 350 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.002 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 86µA (x2 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 4.75 V
- Voltage - Supply Span (Max):
- 15.5 V
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LPC662AIMX FAQ
1.How can I place an order for LPC662AIMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LPC662AIMX 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 LPC662AIMX reliable?
The price and inventory of LPC662AIMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LPC662AIMX is usually 5 days.
3.What payment methods are accepted for LPC662AIMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LPC662AIMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LPC662AIMX?
LPC662AIMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LPC662AIMX 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 LPC662AIMX?
For technical support, including LPC662AIMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LPC662AIMX requirements.
6.How does Aetrix verify that LPC662AIMX is sourced from the original manufacturer or authorized distributors?
All LPC662AIMX 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 LPC662AIMX meets industry standards.
7.What is the process for return or replacement of LPC662AIMX?
All LPC662AIMX units undergo pre-shipment inspection (PSI). If there is an issue with LPC662AIMX, 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 LPC662AIMX part is unused and in its original packaging.
Return procedure for LPC662AIMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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