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Texas Instruments LPC662AIM/NOPB
- Part No.:
- LPC662AIM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LPC662AIM/NOPB.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,201
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Product details
Overview
LPC662AIM/NOPB 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 high-impedance sensor interfaces and battery-powered instrumentation.
For engineers reviewing the LPC662AIM/NOPB datasheet, LPC662AIM/NOPB pinout, LPC662AIM/NOPB application, or LPC662AIM/NOPB equivalent, key selection criteria include its micropower operation (<0.5 mW per amplifier), input common-mode range extending to ground, guaranteed performance at 5 kΩ and 100 kΩ loads, and SOIC-8 packaging suitable for space-constrained industrial and medical analog front-ends.
Technical Context
The LPC662AIM/NOPB employs a nonstandard topology where the output is taken directly from the integrator stage-enabling rail-to-rail swing without a traditional unity-gain buffer. This architecture incorporates dual feed-forward compensation (Cf and Cff) and a push-pull output stage to sustain stability while driving ≥500 Ω resistive loads or capacitive loads with external series-R + shunt-C compensation.
Its ultra-low input bias current (2 fA typ.) and >1 TΩ input resistance are achieved via advanced double-poly silicon-gate CMOS processing, making it uniquely suited for photodiode transimpedance amplifiers and long-term integrators where leakage-induced drift must be minimized. Input common-mode voltage includes ground across the full supply range, supporting true single-supply signal acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +4.75 V to +15.5 V - supports direct interface with 5 V and 12 V systems without level-shifting. |
| Input Offset Voltage | 3 mV max - enables accurate DC-coupled amplification of µV-level sensor signals without trimming. |
| Input Bias Current | 2 fA typ. - ensures <100 pA error current even with 100 MΩ source impedances. |
| Rail-to-Rail Output Swing | Within 10 mV of rails (RL = 100 kΩ, V+ = 5 V) - maximizes dynamic range in single-supply data acquisition. |
| Slew Rate | 0.11 V/µs - sufficient for ≤1 kHz precision waveforms with <0.01% THD at 1 kHz. |
| Quiescent Current | 86 µA per amplifier - allows dual-channel operation at <0.5 mW total power from 5 V. |
| Gain-Bandwidth Product | 0.35 MHz - supports stable closed-loop gain up to ~35 at 10 kHz with adequate phase margin. |
Pinout & Package
Package: 8-pin SOIC (Small Outline Integrated Circuit), body width 3.9 mm, JEDEC MS-012AC, RoHS-compliant matte tin (SN) lead finish, MSL Level-1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amplifier A) | High-impedance node requiring guard ring layout to preserve sub-pA bias current performance. |
| 2 | Non-Inverting Input (Amplifier A) | Accepts common-mode voltages from ground to (V+) −2.3 V - enables true single-supply sensor buffering. |
| 3 | Output (Amplifier A) | Capable of sourcing/sinking ≥16 mA; requires series resistor + feedback capacitor for >100 pF capacitive loads. |
| 4 | V− (Ground for single-supply) | Reference node for both amplifiers; must be low-impedance to maintain PSRR >63 dB. |
| 5 | Non-Inverting Input (Amplifier B) | Independent high-Z input - supports dual-channel signal paths without crosstalk (130 dB isolation). |
| 6 | Inverting Input (Amplifier B) | Matched to Pin 1; usable in differential configurations with matched external resistors. |
| 7 | Output (Amplifier B) | Identical drive capability to Pin 3; supports independent load switching or parallel operation. |
| 8 | V+ | Positive supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full 4.94 Vpp output from 5 V supply into 100 kΩ - eliminates need for level-shifting in ADC driver stages. |
| Micropower operation | 86 µA per amplifier enables dual-channel operation at <0.5 mW - critical for portable gas sensors and wearable biosignal monitors. |
| Input common-mode range includes ground | Allows direct connection of grounded-sensor sources (e.g., thermocouples, pH electrodes) without AC coupling or bias networks. |
| Ultra-low input bias current (2 fA) | Enables integration times >10 seconds in precision charge amplifiers with minimal droop error. |
| Specified for 5 kΩ and 100 kΩ loads | Guarantees 1000 V/mV large-signal gain into 100 kΩ - supports high-precision current-to-voltage conversion with 1% accuracy. |
Applications
| Photodiode Current-to-Voltage Converter | High-Impedance Preamplifier |
|---|---|
Use Scenario: Converting weak photocurrents (pA–nA) from scientific-grade photodiodes into measurable voltage signals under low-light conditions. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias current preserving signal integrity and minimizing dark-current-induced offset. Use Value: 2 fA input bias current ensures <1 µV output error from 1 GΩ feedback resistor, enabling detection of sub-picoamp photocurrents. |
Use Scenario: Amplifying microvolt-level outputs from piezoelectric accelerometers or electret microphones in battery-powered IoT edge nodes. IC Role / Device Role / Timing Role: First-stage DC-coupled buffer with rail-to-rail output and ground-referenced input to maximize SNR without AC coupling. Use Value: Input common-mode range including ground allows direct sensor connection; 3 mV VOS enables calibration-free operation over 0–85 °C. |
| Long-Term Integrator | Active Filter (10 Hz Bandpass) |
Use Scenario: Accumulating charge from radiation detectors or electrochemical cells over minutes to hours for dose or concentration measurement. IC Role / Device Role / Timing Role: Precision integrator core with ultra-low input bias current and low VOS drift (1.3 µV/°C) minimizing integration drift. Use Value: 1.3 µV/°C drift limits output error to <1.5 mV over 50 °C ambient shift - enabling ±0.1% accuracy in 1-hour integrations. |
Use Scenario: Filtering biological signals (e.g., ECG, EEG) in portable diagnostics equipment to suppress 50/60 Hz interference and muscle noise. IC Role / Device Role / Timing Role: Dual-amplifier active filter section implementing 10 Hz bandpass response with Q = 2.1 and −8.8 gain. Use Value: Guaranteed 0.01% THD at 1 kHz ensures minimal harmonic distortion of physiological waveforms during amplification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-power op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2462IDR | Higher quiescent current (550 µA vs. 86 µA); 1.2 V/µs slew rate; VOS = 1.6 mV max. | Better speed but 6× higher power - suitable for higher-bandwidth sensor interfaces where micropower is secondary. | Select TLV2462IDR when bandwidth >1 MHz is required and supply current budget allows >500 µA per channel. |
| LMV722MMX/NOPB | Lower VOS (0.85 mV max); 1.5 MHz GBW; 120 µA IQ; no rail-to-rail input - common-mode range starts at V− + 1.2 V. | Superior DC precision but incompatible with ground-referenced inputs - requires input biasing network for single-supply use. | Choose LMV722MMX/NOPB for applications demanding <1 mV offset where input can be biased above ground. |
Compared with TLV2462IDR and LMV722MMX/NOPB, the LPC662AIM/NOPB uniquely combines sub-100 µA quiescent current, rail-to-rail output, ground-inclusive input range, and femtoampere bias current - making it irreplaceable in ultra-low-power, high-impedance, single-supply precision analog front-ends.
Availability
LPC662AIM/NOPB is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, battery-powered medical sensors, and long-duration electrochemical integrators requiring stable component supply across extended production lifecycles.
Supply support for LPC662AIM/NOPB 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 full technical and manufacturing continuity for legacy precision analog products like the LPC662 series.
The LPC662AIM/NOPB belongs to TI's legacy precision CMOS op-amp family, designed specifically for ultra-low-power, high-input-impedance applications in instrumentation, medical devices, and environmental monitoring where femtoampere-level leakage must be avoided.
FAQ
What is the maximum capacitive load the LPC662AIM/NOPB can drive without oscillation?
The LPC662AIM/NOPB may oscillate with capacitive loads near the instability threshold, especially in unity-gain follower configuration. It can reliably drive ≤100 pF without external compensation. For larger loads (e.g., 500 pF–1 nF), a 50–100 Ω series resistor at the output plus a 5–10 pF capacitor from inverting input to output restores phase margin. The datasheet confirms stable operation with this configuration up to 1 nF, provided the pull-up resistor technique is used for heavy capacitive loading.
Does the LPC662AIM/NOPB support true single-supply operation with input signals at ground potential?
Yes, the LPC662AIM/NOPB supports true single-supply operation with input common-mode voltage ranging from ground to (V+) −2.3 V at 25 °C. This allows direct connection of grounded sensors such as thermocouples or pH electrodes without level-shifting circuitry. The input stage is fully functional at VCM = 0 V, and CMRR remains ≥50 dB across this range - a key differentiator versus many CMOS op-amps that require input biasing above ground.
What is the thermal resistance (θJA) of the LPC662AIM/NOPB in its SOIC-8 package?
The LPC662AIM/NOPB in 8-pin SOIC (package drawing D) has a junction-to-ambient thermal resistance (θJA) of 165 °C/W when mounted on a standard JEDEC 2-layer PCB with 1 in² copper pad. This value assumes no internal copper planes or thermal vias. Derating is required above 25 °C ambient: maximum allowable power dissipation = (150 °C − TA) / 165 °C/W. At 85 °C ambient, PDmax = 0.394 W - well above the device's typical 0.17 mW dissipation.
Can the LPC662AIM/NOPB be used in a Howland current pump configuration?
Yes, the LPC662AIM/NOPB is explicitly validated for Howland current pump applications, as shown in Figure 23 of the official datasheet (DS010548-23). Its rail-to-rail output, low VOS (3 mV max), and high open-loop gain (>1000 V/mV into 100 kΩ) ensure accurate current sourcing/sinking with minimal compliance voltage error. The dual-channel architecture allows one amplifier to serve as the control loop and the other as the sense amplifier in integrated designs.
Is the LPC662AIM/NOPB pin-compatible with other members of the LPC66x family?
Yes, the LPC662AIM/NOPB is pin-compatible with all 8-pin variants in the LPC66x family, including LPC660 (quad), LPC661 (single), and LPC662AM/AIN/AMJ versions. All share identical SOIC-8 pinout, electrical pin functions, and absolute maximum ratings. Differences are limited to temperature grade (−40 to +85 °C for AIM/NOPB), packaging (SOIC vs. DIP), and minor parameter limits - allowing drop-in replacement in existing layouts when upgrading from commercial to industrial grade.
LPC662AIM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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
LPC662AIM/NOPB FAQ
1.How can I place an order for LPC662AIM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LPC662AIM/NOPB 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 LPC662AIM/NOPB reliable?
The price and inventory of LPC662AIM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LPC662AIM/NOPB is usually 5 days.
3.What payment methods are accepted for LPC662AIM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LPC662AIM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LPC662AIM/NOPB?
LPC662AIM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LPC662AIM/NOPB 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 LPC662AIM/NOPB?
For technical support, including LPC662AIM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LPC662AIM/NOPB requirements.
6.How does Aetrix verify that LPC662AIM/NOPB is sourced from the original manufacturer or authorized distributors?
All LPC662AIM/NOPB 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 LPC662AIM/NOPB meets industry standards.
7.What is the process for return or replacement of LPC662AIM/NOPB?
All LPC662AIM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LPC662AIM/NOPB, 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 LPC662AIM/NOPB part is unused and in its original packaging.
Return procedure for LPC662AIM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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