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LPC661IM/NOPB Equivalent & Substitute Parts
Part Overview
The LPC661IM/NOPB is a general purpose operational amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device features rail-to-rail output capability and is designed for low-power applications requiring single-circuit amplification. The product status is obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain compatibility with the 8-SOIC package format and support the required supply voltage range of 4.75 V to 15.5 V.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | LPC661IM/NOPB | — |
| Manufacturer | Texas Instruments | — |
| Amplifier Type | General Purpose | — |
| Number of Circuits | 1 | — |
| Output Type | Rail-to-Rail | — |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| Voltage - Supply Span (Min) | 4.75 | V |
| Voltage - Supply Span (Max) | 15.5 | V |
| Operating Temperature | -40°C ~ 85°C | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
| Product Status | Obsolete | — |
Substitute Part Grouping Explanation
Substitution of the LPC661IM/NOPB is determined by the following mandatory compatibility criteria:
Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure direct PCB footprint compatibility.
Functional Classification: Substitute parts must be operational amplifiers with single-circuit configuration and rail-to-rail output capability.
Supply Voltage Range: Substitute parts must support a minimum supply voltage of 4.75 V and maximum supply voltage of 15.5 V to maintain circuit operation within the original design envelope.
Mounting Technology: All substitutes must be surface mount devices compatible with standard SMD assembly processes.
Regulatory Compliance: Substitute parts must maintain ROHS3 compliance and MSL 1 rating to ensure environmental and moisture handling compatibility.
The identified substitute parts are grouped into two categories based on amplifier type: general purpose amplifiers (LMC6061IM/NOPB, AD8665ARZ, AD8665ARZ-REEL, AD8665ARZ-REEL7) and zero-drift amplifiers (AD8638ARZ, AD8638ARZ-REEL, AD8638ARZ-REEL7). Both categories satisfy the mandatory package, voltage, and compliance requirements.
Parameter Comparison
| Parameter | LPC661IM/NOPB | LMC6061IM/NOPB | AD8638ARZ | AD8638ARZ-REEL | AD8638ARZ-REEL7 | AD8665ARZ | AD8665ARZ-REEL | AD8665ARZ-REEL7 |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Amplifier Type | General Purpose | General Purpose | Zero-Drift | Zero-Drift | Zero-Drift | General Purpose | General Purpose | General Purpose |
| Number of Circuits | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Voltage - Supply Span (Min) | 4.75 V | 4.5 V | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Voltage - Supply Span (Max) | 15.5 V | 15.5 V | 16 V | 16 V | 16 V | 16 V | 16 V | 16 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Obsolete | Last Time Buy | Active | Active | Active | Active | Active | Active |
| Slew Rate | 0.11 V/µs | 0.035 V/µs | 2 V/µs | 2 V/µs | 2 V/µs | 3.5 V/µs | 3.5 V/µs | 3.5 V/µs |
| Gain Bandwidth Product | 350 kHz | 100 kHz | 1.5 MHz | 1.5 MHz | 1.5 MHz | 4 MHz | 4 MHz | 4 MHz |
| Current - Input Bias | 0.002 pA | 0.01 pA | 1 pA | 1 pA | 1 pA | 0.2 pA | 0.2 pA | 0.2 pA |
| Voltage - Input Offset | 1 mV | 100 µV | 3 µV | 3 µV | 3 µV | 600 µV | 600 µV | 600 µV |
| Current - Supply | 58 µA | 24 µA | 1.25 mA | 1.25 mA | 1.25 mA | 1.15 mA | 1.15 mA | 1.15 mA |
Engineering Selection Recommendations
For Obsolete Product Replacement: The LPC661IM/NOPB is classified as obsolete. Direct replacement with active-status alternatives is required for new designs and long-term procurement. The LMC6061IM/NOPB carries Last Time Buy status and should not be selected for new applications requiring extended product availability.
For Active Product Selection: AD8638ARZ, AD8638ARZ-REEL, AD8638ARZ-REEL7, AD8665ARZ, AD8665ARZ-REEL, and AD8665ARZ-REEL7 all maintain Active product status from Analog Devices Inc., ensuring long-term availability and manufacturing support.
Packaging Considerations: All substitute parts are available in multiple packaging formats. AD8638ARZ-REEL7 and AD8665ARZ-REEL7 are supplied in Cut Tape (CT) & Digi-Reel® format, while AD8638ARZ and AD8665ARZ are supplied in Tube packaging. Selection between packaging formats depends on assembly volume and handling requirements.
Compliance Verification: All substitute parts maintain ROHS3 compliance and MSL 1 rating, matching the original LPC661IM/NOPB specifications. No additional environmental or moisture handling procedures are required during transition.
Supply Voltage Compatibility: All substitute parts support the required 4.75 V to 15.5 V supply range, with most offering extended maximum voltage to 16 V. LMC6061IM/NOPB supports minimum voltage of 4.5 V, which is compatible with the original 4.75 V minimum specification.
Frequently Asked Questions (FAQ)
Q: Can the LPC661IM/NOPB be directly replaced with any of the listed substitutes without PCB modification?
A: Yes. All substitute parts use the identical 8-SOIC (0.154", 3.90mm Width) package, enabling direct footprint compatibility without PCB redesign. Pin configuration remains consistent across all listed alternatives.
Q: What is the primary difference between the AD8638 and AD8665 substitute families?
A: The AD8638 series are zero-drift amplifiers with superior input offset voltage (3 µV) and higher slew rate (2 V/µs), suitable for precision measurement applications. The AD8665 series are general purpose amplifiers with higher gain bandwidth product (4 MHz) and output current capability (140 mA), suitable for signal conditioning and buffering applications.
Q: Does the LMC6061IM/NOPB offer advantages over the Analog Devices alternatives?
A: The LMC6061IM/NOPB provides lower supply current (24 µA) and lower input offset voltage (100 µV) compared to the general purpose AD8665 series. However, LMC6061IM/NOPB carries Last Time Buy status, limiting its suitability for new designs requiring extended product lifecycle.
Q: Are there differences between AD8638ARZ, AD8638ARZ-REEL, and AD8638ARZ-REEL7?
A: These part numbers represent the same device with different packaging formats. AD8638ARZ is supplied in Tube packaging, AD8638ARZ-REEL is supplied in standard Tape & Reel format, and AD8638ARZ-REEL7 is supplied in Cut Tape (CT) & Digi-Reel® format. Electrical specifications and performance are identical.
Q: What supply voltage range must be maintained for all substitute parts?
A: All substitute parts support minimum supply voltage of 5 V and maximum supply voltage of 16 V. The original LPC661IM/NOPB minimum of 4.75 V is not supported by most substitutes; designs operating below 5 V require LMC6061IM/NOPB (4.5 V minimum) as the only alternative.
Q: Are all substitute parts suitable for the original -40°C to 85°C operating temperature range?
A: Yes. All substitute parts support the original operating temperature range of -40°C to 85°C. Most substitutes extend the maximum temperature to 125°C, providing additional thermal margin for demanding applications.
Q: What inventory status should influence substitute part selection?
A: AD8638ARZ-REEL7 offers the highest inventory (18,200 pcs), followed by AD8638ARZ (100,400 pcs). For applications requiring immediate procurement, these parts provide the shortest lead times. LMC6061IM/NOPB inventory (1,266 pcs) is limited and should be reserved for designs requiring its specific low-supply-current characteristics.
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