LPC660IMX CMOS Quad Operational Amplifier Equivalent & Substitute Parts

Part Overview

The LPC660IMX is a low-power CMOS operational amplifier featuring four independent circuits in a single 14-SOIC package. This device delivers push-pull, rail-to-rail output capability with minimal input bias current, making it suitable for battery-powered and low-power analog signal processing applications.

The LPC660IMX is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support long-term production requirements for systems utilizing this amplifier topology.

Substiute Parts

LPC660IMX

Texas InstrumentsIn Stock: 3716LPC660IMX Datasheet

Current PartRFQ

LPC660IMX/NOPB

National SemiconductorIn Stock: 1320LPC660IMX/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LPC660IMX is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Amplifier topology: CMOS technology
• Circuit count: Four independent operational amplifier circuits
• Output configuration: Push-pull, rail-to-rail output stage
• Slew rate: 0.11 V/µs
• Gain bandwidth product: 350 kHz
• Input bias current: 0.002 pA
• Input offset voltage: 1 mV
• Supply current: 160 µA total (40 µA per channel nominal)
• Output current capability: 40 mA per channel minimum
• Supply voltage range: 4.75 V to 15.5 V
• Temperature operating range: -40°C to +85°C

Mechanical Equivalence Criteria:

• Package type: 14-SOIC surface mount
• Package dimensions: 0.154" width (3.90 mm)
• Pin configuration: Identical pinout

Substitute parts must match all electrical and mechanical parameters without deviation. Parts meeting these criteria are classified as direct functional equivalents suitable for drop-in replacement.

Parameter Comparison

Engineering Selection Recommendations

LPC660IMX/NOPB as Direct Substitute:

The LPC660IMX/NOPB qualifies as a direct functional equivalent to the LPC660IMX. All electrical parameters, mechanical specifications, and operating characteristics are identical. The substitute part is manufactured by National Semiconductor and carries an active product status, providing improved long-term availability compared to the obsolete LPC660IMX.

Selection Basis:

1. Electrical Compatibility: All performance parameters match exactly, including slew rate, bandwidth, bias current, offset voltage, supply current, output current, and supply voltage range.

2. Mechanical Compatibility: Package type, dimensions, and pinout are identical, enabling direct PCB-level substitution without layout modification.

3. Product Status Advantage: The LPC660IMX/NOPB maintains active production status, supporting ongoing supply chain requirements and reducing obsolescence risk.

4. Compliance Considerations: RoHS compliance status differs between the two parts. Design teams must verify compliance requirements for their specific application before selection.

5. Inventory Availability: Both parts maintain current stock levels, with the original LPC660IMX offering higher immediate availability (3620 units) compared to the substitute (1290 units).

Frequently Asked Questions (FAQ)

Q: Can LPC660IMX/NOPB replace LPC660IMX in existing designs without modification?

A: Yes. The LPC660IMX/NOPB is electrically and mechanically equivalent. No circuit design changes, PCB layout modifications, or firmware updates are required. Direct component substitution is supported.

Q: What is the difference between LPC660IMX and LPC660IMX/NOPB?

A: Both parts are identical in electrical performance and mechanical specifications. The primary differences are manufacturer designation (Texas Instruments vs. National Semiconductor) and product status (obsolete vs. active). The "/NOPB" suffix indicates lead-free, RoHS-compliant packaging from National Semiconductor.

Q: Are there any performance differences in slew rate, bandwidth, or output current?

A: No. Slew rate (0.11 V/µs), gain bandwidth product (350 kHz), and output current per channel (40 mA) are identical across both parts.

Q: What supply voltage range is supported by both parts?

A: Both the LPC660IMX and LPC660IMX/NOPB operate across a supply voltage range of 4.75 V to 15.5 V, supporting single-supply and dual-supply configurations.

Q: Is the 14-SOIC package identical for both parts?

A: Yes. Both parts use the same 14-SOIC surface mount package with 0.154" width (3.90 mm). Pin assignments and spacing are identical.

Q: What is the input bias current specification?

A: Both parts specify 0.002 pA input bias current, characteristic of CMOS operational amplifier technology with extremely high input impedance.

Q: Can these parts be used in battery-powered applications?

A: Yes. The low supply current specification (160 µA total for four channels, or 40 µA per channel) makes both parts suitable for battery-powered and low-power analog signal processing applications.

Q: What is the operating temperature range?

A: Both parts operate across -40°C to +85°C, supporting industrial and commercial temperature environments.

Q: Are there RoHS compliance differences?

A: The LPC660IMX is listed as RoHS non-compliant. The LPC660IMX/NOPB carries the "/NOPB" designation indicating lead-free, RoHS-compliant packaging. Design teams must verify compliance requirements for their application.