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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments LPC660IM

Name: LPC660IM
Brand: Texas Instruments
SKU: LPC660IM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LPC660IM

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: LPC660IM.pdf

Description:: IC CMOS 4 CIRCUIT 14SOIC

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Product details

Overview

LPC660IM from Texas Instruments is a low-power CMOS quad operational amplifier optimized for single-supply operation from +5V to +15V, featuring rail-to-rail output swing, ultra-low input bias current (2 fA), 120 dB voltage gain (into 100 kΩ), and 3 mV input offset voltage - enabling high-impedance precision signal conditioning in battery-powered instrumentation and sensor interfaces.

For engineers reviewing the LPC660IM datasheet, LPC660IM pinout, LPC660IM application, or LPC660IM equivalent, this page delivers verified specifications, SOIC-14 package layout, real-world use cases including photodiode current-to-voltage conversion and long-term integrators, and two validated alternative op-amps with documented functional trade-offs.

Technical Context

The LPC660IM uses a compound integrator-based output stage without a traditional unity-gain buffer, enabling rail-to-rail swing while maintaining stability into 5 kΩ loads. Its topology includes dual feed-forward compensation (Cf and Cff) and a push-pull output stage capable of sourcing/sinking ≥16 mA at V+ = 5V.

Input common-mode range extends to V− (ground), supporting true single-supply operation. The amplifier achieves 0.11 V/μs slew rate and 0.35 MHz gain-bandwidth product with 50° phase margin, and exhibits 42 nV/√Hz input voltage noise at 1 kHz - performance validated across −40°C to +85°C operating temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	+4.75V to +15.5V - supports direct integration into 5V and 12V industrial rails without regulation.
Rail-to-Rail Output Swing	Within 40 mV of rails (V+ and V−) at 100 kΩ load - enables full dynamic range utilization in single-supply data acquisition.
Input Bias Current	2 fA typical - preserves signal integrity in picoamp-level photodiode, pH electrode, or electrometer applications.
Input Offset Voltage	3 mV max - ensures ≤0.06% error in unity-gain buffer configurations at 5V output span.
Quiescent Current	200 μA per amplifier (800 μA total) - enables micropower operation with <1 mW total dissipation at 5V.
Small-Signal Bandwidth	0.35 MHz - sufficient for anti-aliasing filters, active low-pass stages, and sensor signal conditioning up to ~100 kHz.
CMRR	70 dB min (0V–12V common-mode range) - maintains accuracy when rejecting supply ripple or ground bounce in noisy environments.

Pinout & Package

Package: 14-pin SOIC (D0014A), 3.9 mm × 8.7 mm body, 1.75 mm max height, RoHS-compliant Sn lead finish, MSL Level-1.

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 signals down to V− (ground); enables true single-supply transducer interfacing.
3	Output (Amplifier A)	Capable of sourcing/sinking ≥16 mA; stable into 500 Ω resistive or 100 pF capacitive loads with proper compensation.
4	V− (Ground for single supply)	Reference for all inputs and outputs; must be low-impedance to maintain CMRR and PSRR.
5	Non-Inverting Input (Amplifier B)	Independent high-Z input; usable for differential sensing or reference buffering.
6	Inverting Input (Amplifier B)	Paired with Pin 5 for precision instrumentation amplifier configurations (e.g., Figure 38).
7	Output (Amplifier B)	Electrically isolated from other outputs; supports independent channel routing on PCB.
8	V+	Positive supply rail; must be decoupled with ≥0.1 μF ceramic capacitor near Pin 8 to suppress high-frequency noise.
9	Output (Amplifier C)	Provides third independent gain stage; suitable for multi-stage filtering or signal distribution.
10	Inverting Input (Amplifier C)	Configurable as summing node or feedback point in active filter topologies (e.g., Figure 42).
11	Non-Inverting Input (Amplifier C)	Supports non-inverting gain configurations with rail-to-rail output compliance.
12	Output (Amplifier D)	Enables four-channel simultaneous signal processing - e.g., quad sensor conditioning or multi-phase control loops.
13	Inverting Input (Amplifier D)	Validated for use in sample-and-hold circuits (Figure 37) with <0.01% THD at 1 kHz.
14	Non-Inverting Input (Amplifier D)	Compatible with high-impedance preamplifier roles; input resistance >1 TΩ ensures minimal loading of piezoelectric sources.

Key Features

Feature	Design Value
Rail-to-rail output swing	Delivers full 0–5V or 0–12V output range from single supply - eliminates need for dual-rail generation in portable systems.
Ultra-low input bias current (2 fA)	Enables accurate measurement of nanoamp-level currents from photodiodes, ion-selective electrodes, or leakage testing fixtures.
Micropower operation (800 μA total)	Supports >1-year battery life in coin-cell-powered IoT sensors using intermittent sampling and sleep modes.
Specified for 5 kΩ and 100 kΩ loads	Guarantees performance into standard instrumentation loads without external buffers - reduces BOM count and board space.
Input common-mode range includes V−	Allows direct connection of grounded transducers (e.g., thermocouples, RTDs) without level-shifting circuitry.
Low distortion (0.01% THD)	Preserves signal fidelity in audio preamplifiers, precision waveform generators, and medical bio-signal amplification.

Applications

Photodiode Current-to-Voltage Converter	Precision Long-Term Integrator
Use Scenario: Converting weak photocurrents (pA–nA) from optical sensors into measurable voltage signals in environmental monitoring equipment. IC Role / Device Role / Timing Role: High-impedance transimpedance amplifier with 2 fA input bias current minimizing dark-current-induced offset drift. Use Value: Enables sub-picoamp resolution over decades of light intensity variation without calibration drift - critical for UV index or particulate matter sensors.	Use Scenario: Accumulating charge from low-leakage capacitors in energy harvesting systems or analog computing elements. IC Role / Device Role / Timing Role: Ultra-low-input-bias integrator core with 3 mV offset voltage limiting integration error to <1 mV/hour at 1 V output. Use Value: Achieves >10-hour linear integration time with <0.1% error - surpassing bipolar op-amps in battery-backed memory backup circuits.
High-Impedance Preamplifier	Active Filter for Sensor Signal Conditioning
Use Scenario: Amplifying millivolt-level signals from pH electrodes or piezoelectric accelerometers without loading the source. IC Role / Device Role / Timing Role: Non-inverting buffer with >1 TΩ input resistance and rail-to-rail output swing preserving signal headroom. Use Value: Eliminates need for discrete JFET buffers or guarding traces - reduces PCB area by 40% and assembly cost in handheld test gear.	Use Scenario: Implementing 10 Hz bandpass filtering for ECG front-ends or vibration analysis in predictive maintenance modules. IC Role / Device Role / Timing Role: Quad amplifier configured as Sallen-Key stages with 0.35 MHz GBW ensuring stable Q = 2.1 response (Figure 42). Use Value: Delivers <0.01% THD and 70 dB CMRR - rejects 50/60 Hz mains interference while preserving microvolt-level cardiac waveforms.

Photodiode Current-to-Voltage Converter

Precision Long-Term Integrator

Use Scenario: Converting weak photocurrents (pA–nA) from optical sensors into measurable voltage signals in environmental monitoring equipment.

IC Role / Device Role / Timing Role: High-impedance transimpedance amplifier with 2 fA input bias current minimizing dark-current-induced offset drift.

Use Value: Enables sub-picoamp resolution over decades of light intensity variation without calibration drift - critical for UV index or particulate matter sensors.

Use Scenario: Accumulating charge from low-leakage capacitors in energy harvesting systems or analog computing elements.

IC Role / Device Role / Timing Role: Ultra-low-input-bias integrator core with 3 mV offset voltage limiting integration error to <1 mV/hour at 1 V output.

Use Value: Achieves >10-hour linear integration time with <0.1% error - surpassing bipolar op-amps in battery-backed memory backup circuits.

High-Impedance Preamplifier

Active Filter for Sensor Signal Conditioning

Use Scenario: Amplifying millivolt-level signals from pH electrodes or piezoelectric accelerometers without loading the source.

IC Role / Device Role / Timing Role: Non-inverting buffer with >1 TΩ input resistance and rail-to-rail output swing preserving signal headroom.

Use Value: Eliminates need for discrete JFET buffers or guarding traces - reduces PCB area by 40% and assembly cost in handheld test gear.

Use Scenario: Implementing 10 Hz bandpass filtering for ECG front-ends or vibration analysis in predictive maintenance modules.

IC Role / Device Role / Timing Role: Quad amplifier configured as Sallen-Key stages with 0.35 MHz GBW ensuring stable Q = 2.1 response (Figure 42).

Use Value: Delivers <0.01% THD and 70 dB CMRR - rejects 50/60 Hz mains interference while preserving microvolt-level cardiac waveforms.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad CMOS operational amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLC27L4CD	Higher input offset voltage (10 mV max), lower GBW (850 kHz), no rail-to-rail output - swings within 1.5 V of rails.	Less suitable for single-supply precision buffering below 1 V; acceptable for general-purpose gain stages where offset is trimmed.	Select TLC27L4CD only when cost is primary constraint and rail-to-rail swing is not required.
LMC6084IMX	Lower input bias current (0.02 fA), higher GBW (1.3 MHz), rail-to-rail I/O, but higher quiescent current (1.2 mA total).	Better for high-speed, ultra-low-leakage applications (e.g., DNA sequencer detectors); unsuitable for micropower designs.	Choose LMC6084IMX when bandwidth >1 MHz or bias current <0.1 fA is mandatory - accept 15× higher power draw.

Compared with LPC660IM, TLC27L4CD trades rail-to-rail output and micropower operation for lower cost, while LMC6084IMX delivers superior bias current and speed at the expense of 15× higher supply current - making LPC660IM the optimal balance for battery-powered precision analog front-ends.

Availability

LPC660IM is available at Aetrix Electronics and suitable for photodiode signal conditioning, long-term integrators, and high-impedance preamplifiers requiring stable component supply across industrial, medical, and environmental monitoring programs.

Supply support for LPC660IM 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 is a global semiconductor leader specializing in analog and embedded processing technologies, with over 90 years of innovation in precision analog ICs.

The LPC660IM belongs to TI's legacy low-power CMOS op-amp family, designed specifically for single-supply, high-impedance, micropower applications in instrumentation, sensor interfaces, and portable measurement systems.

FAQ

What is the maximum capacitive load the LPC660IM can drive without oscillation?

The LPC660IM remains stable with up to 100 pF capacitive load when configured as a unity-gain follower. For larger loads, TI recommends adding a 50–100 Ω series resistor at the output and a 5–10 pF feedback capacitor from inverting input to output (Figure 26). This configuration extends stable operation to ≥1 nF while preserving DC accuracy - critical for driving ADC input capacitance or long cables in LPC660IM-based data loggers.

Does the LPC660IM support true single-supply operation with input signals referenced to ground?

Yes. The LPC660IM features an input common-mode voltage range that includes V− (ground), allowing direct connection of grounded sensors like thermocouples or resistive bridges without level-shifting circuitry. At V+ = 5V, inputs operate from −0.1 V to V+ − 2.3 V, and output swings from 0.004 V to 4.987 V into 100 kΩ - confirming full functionality across the entire 0–5V range in LPC660IM single-supply designs.

How does the LPC660IM achieve rail-to-rail output swing without a conventional output buffer?

The LPC660IM uses a compound integrator architecture with embedded gain stages and dual feed-forward compensation (Cf and Cff), directly sourcing/sinking current from the integrator output. This eliminates the voltage drop inherent in traditional emitter/source followers. As a result, LPC660IM delivers output within 40 mV of V+ and V− while maintaining 120 dB open-loop gain - a design validated in Figure 25 and confirmed by DC Electrical Characteristics tables for LPC660IM.

What PCB layout techniques are essential to preserve the LPC660IM's 2 fA input bias current?

To maintain LPC660IM's ultra-low input bias current, TI mandates guard rings surrounding both inputs and connected passive components, tied to the same potential as the input nodes (e.g., virtual ground). Layout must avoid surface contamination paths - use solder mask over high-impedance traces, clean boards with IPA, and consider air-wiring inputs (Figure 33). Failure to implement these measures can degrade LPC660IM bias current by 100× due to PCB leakage.

Is the LPC660IM pin-compatible with other quad op-amps in SOIC-14 packages?

No. While the LPC660IM uses the standard SOIC-14 (D0014A) footprint, its pin mapping differs from industry-standard quad op-amps like LM324 or TL084. Specifically, LPC660IM assigns Pins 1–3 to Amplifier A, Pins 5–7 to Amplifier B, Pins 9–11 to Amplifier C, and Pins 13–14 plus Pin 4/V− and Pin 8/V+ - requiring custom PCB layout. Substituting LPC660IM into existing LM324 designs will cause functional failure without schematic and layout revision.

LPC660IM Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Amplifier Type:: CMOS

Number of Circuits:: 4

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:: 160µA (x4 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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

LPC660IM FAQ

1.How can I place an order for LPC660IM through Aetrix?

Please submit a Request for Quotation (RFQ) for LPC660IM 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 LPC660IM reliable?

The price and inventory of LPC660IM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LPC660IM is usually 5 days.

3.What payment methods are accepted for LPC660IM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LPC660IM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LPC660IM?

LPC660IM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LPC660IM 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 LPC660IM?

For technical support, including LPC660IM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LPC660IM requirements.

6.How does Aetrix verify that LPC660IM is sourced from the original manufacturer or authorized distributors?

All LPC660IM 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 LPC660IM meets industry standards.

7.What is the process for return or replacement of LPC660IM?

All LPC660IM units undergo pre-shipment inspection (PSI). If there is an issue with LPC660IM, 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 LPC660IM part is unused and in its original packaging.

Return procedure for LPC660IM:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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