LPC660IM/NOPB Equivalent & Substitute Parts

Part Overview

The LPC660IM/NOPB is a CMOS 4-circuit operational amplifier manufactured by Texas Instruments, housed in a 14-SOIC surface mount package. This device features push-pull, rail-to-rail output configuration with low input bias current and is designed for general-purpose analog signal processing applications. The part is currently in Last Time Buy status, indicating discontinued production. Identification of equivalent and substitute parts is necessary to ensure design continuity and procurement availability for new production runs and legacy system support.

Substiute Parts

LPC660IM/NOPB

Texas InstrumentsIn Stock: 1062LPC660IM/NOPB Datasheet

Current PartRFQ

LMC6081IMX/NOPB

Texas InstrumentsIn Stock: 6780LMC6081IMX/NOPB Datasheet

MFR RecommendedRFQ

AD8668ARZ

Analog Devices Inc.In Stock: 2283AD8668ARZ Datasheet

MFR RecommendedRFQ

AD8668ARZ-REEL

Analog Devices Inc.In Stock: 1965AD8668ARZ-REEL Datasheet

MFR RecommendedRFQ

AD8668ARZ-REEL7

Analog Devices Inc.In Stock: 61078AD8668ARZ-REEL7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LPC660IM/NOPB is determined by the following critical parameters:

Primary Substitution Criteria:

• Number of circuits: 4 (quad configuration required)
• Package type: 14-SOIC surface mount
• Output configuration: Rail-to-rail capability
• Supply voltage range: Minimum 4.75 V to maximum 15.5 V overlap
• Operating temperature range: -40°C to 85°C minimum coverage
• RoHS3 compliance and MSL Level 1 rating

Secondary Compatibility Factors:

• Slew rate, gain bandwidth product, and output current drive capability
• Input bias current and input offset voltage characteristics
• Supply current consumption per channel

The substitute parts identified below maintain compatibility with the 14-SOIC package footprint and satisfy the core electrical requirements for quad-channel rail-to-rail amplifier applications. Packaging variants (Tube vs. Tape & Reel) do not affect electrical compatibility but influence procurement and assembly processes.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Quad-Channel, 14-SOIC Package):

The AD8668ARZ, AD8668ARZ-REEL, and AD8668ARZ-REEL7 are direct functional equivalents for the LPC660IM/NOPB in applications requiring four independent amplifier channels in a 14-SOIC package. All three variants are manufactured by Analog Devices Inc. and maintain identical electrical specifications. The primary difference is packaging format: AD8668ARZ is supplied in Tube packaging, while AD8668ARZ-REEL and AD8668ARZ-REEL7 are supplied in Tape & Reel format. AD8668ARZ-REEL7 offers significantly higher inventory availability (61,000 units) compared to AD8668ARZ-REEL (1,900 units).

These substitutes provide superior performance characteristics: slew rate of 3.5 V/µs (versus 0.11 V/µs), gain bandwidth product of 4 MHz (versus 350 kHz), and output current drive of 140 mA per channel (versus 40 mA). Operating temperature range extends to 125°C, exceeding the LPC660IM/NOPB specification of 85°C. Supply voltage range compatibility is maintained (5 V to 16 V overlaps with 4.75 V to 15.5 V). All parts are ROHS3 compliant with MSL Level 1 rating.

Secondary Substitute (Single-Channel, 8-SOIC Package):

The LMC6081IMX/NOPB is a Texas Instruments general-purpose amplifier with rail-to-rail output in an 8-SOIC package. This part is not a direct substitute due to single-channel configuration versus quad-channel requirement. Selection of LMC6081IMX/NOPB is appropriate only for applications requiring individual amplifier channels or where four separate 8-SOIC packages can replace the quad-channel 14-SOIC configuration. This part is currently in Active product status with 6,731 units in stock.

Compliance and Availability:

All identified substitutes maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard surface mount assembly processes. The AD8668ARZ-REEL7 variant is recommended for new production due to superior inventory availability and Active product status, ensuring long-term supply chain stability compared to the Last Time Buy status of the LPC660IM/NOPB.

Frequently Asked Questions (FAQ)

Q: Can the AD8668ARZ directly replace the LPC660IM/NOPB in existing PCB designs?

A: Yes, the AD8668ARZ is a direct pin-compatible replacement. Both devices use the 14-SOIC package with identical pinout. The footprint, lead spacing (0.154" width, 3.90mm), and pin configuration are identical. No PCB layout modifications are required.

Q: What are the key performance differences between the LPC660IM/NOPB and AD8668ARZ?

A: The AD8668ARZ provides significantly higher slew rate (3.5 V/µs versus 0.11 V/µs) and gain bandwidth product (4 MHz versus 350 kHz). Output current drive is 140 mA per channel compared to 40 mA. Input offset voltage is lower (600 µV versus 1 mV). These improvements make the AD8668ARZ suitable for higher-frequency applications and higher-impedance load driving. Supply current per channel is higher (287.5 µA versus 40 µA), which may impact power budget in battery-powered applications.

Q: Are there packaging format differences between AD8668ARZ, AD8668ARZ-REEL, and AD8668ARZ-REEL7?

A: Electrical specifications are identical across all three variants. AD8668ARZ is supplied in Tube packaging for manual handling and small-quantity applications. AD8668ARZ-REEL and AD8668ARZ-REEL7 are supplied in Tape & Reel format for automated assembly. The "-REEL7" designation indicates a specific reel configuration. Selection depends on assembly process requirements and procurement volume.

Q: Why is the LMC6081IMX/NOPB listed as a substitute if it has only one circuit?

A: The LMC6081IMX/NOPB is listed as a secondary option for applications where individual amplifier channels are required or where four separate 8-SOIC packages can be used instead of a single quad-channel package. This is not a direct replacement for quad-channel applications but represents an alternative topology for specific design scenarios.

Q: What is the significance of the LPC660IM/NOPB being in Last Time Buy status?

A: Last Time Buy status indicates that Texas Instruments has discontinued production and will no longer manufacture this part after existing inventory is depleted. Designers must transition to alternative parts for new production runs. The AD8668ARZ series, with Active product status, ensures continued availability and long-term supply chain support.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all identified substitute parts (AD8668ARZ, AD8668ARZ-REEL, AD8668ARZ-REEL7, and LMC6081IMX/NOPB) are ROHS3 compliant with MSL Level 1 rating. This ensures compatibility with standard lead-free surface mount assembly processes and environmental regulations.

Q: Can the LPC660IM/NOPB operate at supply voltages below 5 V?

A: The LPC660IM/NOPB has a minimum supply voltage of 4.75 V, allowing operation at voltages slightly below 5 V. The AD8668ARZ series has a minimum supply voltage of 5 V, which is 0.25 V higher. In applications requiring operation below 5 V, the LPC660IM/NOPB or LMC6081IMX/NOPB (minimum 4.5 V) must be retained. For applications at 5 V and above, the AD8668ARZ series is fully compatible.

Q: What is the temperature operating range difference between the LPC660IM/NOPB and AD8668ARZ?

A: The LPC660IM/NOPB operates from -40°C to 85°C. The AD8668ARZ extends the upper temperature limit to 125°C. For applications requiring operation above 85°C, the AD8668ARZ is required. For applications limited to 85°C maximum, both parts are compatible.