OPA2111KM Equivalent & Substitute Parts

Part Overview

The OPA2111KM is a general-purpose operational amplifier featuring two circuits in a TO-99-8 metal can package, manufactured by Texas Instruments under the Difet® series. This device is classified as obsolete, indicating discontinued production and limited availability for new designs. The OPA2111KM operates across a wide supply voltage range of 10V to 36V with low input bias current of 3 pA and moderate slew rate of 2V/µs, making it suitable for precision analog applications requiring through-hole mounting.

Due to its obsolete status, identifying equivalent substitute parts is essential for design continuity, component sourcing, and long-term product support. Active alternatives with compatible electrical characteristics and improved performance specifications are available to replace this device in new designs or production transitions.

Substiute Parts

OPA2111KM

Texas InstrumentsIn Stock: 2801OPA2111KM Datasheet

Current PartRFQ

OPA2140AID

Texas InstrumentsIn Stock: 2238OPA2140AID Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA2111KM is determined by the following critical parameters:

Functional Compatibility:

• Dual-channel operational amplifier configuration (2 circuits required)
• General-purpose amplifier topology capable of operating across the 10V to 36V supply range
• Input bias current specification of 3 pA or lower
• Output current capability of 10 mA per channel or greater

Electrical Performance Criteria:

• Supply voltage range must encompass or exceed the original 10V to 36V specification
• Slew rate of 2V/µs or higher
• Gain bandwidth product of 2 MHz or higher
• Input offset voltage of 300 µV or lower

Compliance & Certification:

• ROHS3 compliance required
• REACH unaffected status
• EAR99 export classification

The OPA2140AID qualifies as a manufacturer-recommended substitute based on superior electrical performance across all critical parameters while maintaining dual-channel configuration, wide supply voltage compatibility, and equivalent regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The OPA2111KM is classified as obsolete, whereas the OPA2140AID maintains active production status. This distinction is critical for long-term component availability and supply chain reliability. Active products receive continued manufacturing support, quality assurance, and technical documentation updates.

Regulatory Compliance: Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring compatibility with current environmental and regulatory requirements. Both carry EAR99 export classification and identical HTSUS codes (8542.33.0001), indicating equivalent trade classification.

Performance Enhancement: The OPA2140AID delivers measurable improvements across all electrical performance metrics: 10× higher slew rate (20V/µs vs. 2V/µs), 5.5× higher gain bandwidth product (11 MHz vs. 2 MHz), 6× lower input bias current (0.5 pA vs. 3 pA), and 10× lower input offset voltage (30 µV vs. 300 µV). These enhancements support higher-speed signal processing and improved precision in analog circuits.

Packaging & Mounting Transition: The OPA2140AID uses 8-SOIC surface-mount packaging versus the through-hole TO-99-8 metal can of the OPA2111KM. This transition requires PCB redesign and assembly process modification. For applications requiring through-hole mounting, alternative substitutes with compatible packages should be evaluated.

Supply Voltage Compatibility: The OPA2140AID operates across 4.5V to 36V, extending the lower supply voltage limit compared to the OPA2111KM (10V to 36V). This expanded range provides greater design flexibility for low-voltage applications.

Frequently Asked Questions (FAQ)

Q: Can the OPA2140AID directly replace the OPA2111KM in existing PCB designs?

A: Electrical substitution is valid based on functional compatibility and superior performance specifications. However, direct PCB replacement is not possible due to package differences: OPA2111KM uses through-hole TO-99-8 metal can mounting, while OPA2140AID requires surface-mount 8-SOIC footprint. PCB redesign and assembly process modification are necessary.

Q: What are the key electrical advantages of the OPA2140AID over the OPA2111KM?

A: The OPA2140AID provides superior performance across multiple parameters: 10× faster slew rate (20V/µs vs. 2V/µs), 5.5× higher bandwidth (11 MHz vs. 2 MHz), 6× lower input bias current (0.5 pA vs. 3 pA), 10× lower input offset voltage (30 µV vs. 300 µV), and 3.6× higher output current per channel (36 mA vs. 10 mA). These improvements enable higher-speed and higher-precision analog signal processing.

Q: Are both devices compliant with current environmental regulations?

A: Yes. Both the OPA2111KM and OPA2140AID are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: What is the significance of the OPA2111KM being classified as obsolete?

A: Obsolete status indicates that Texas Instruments has discontinued production of this device. Existing inventory may be limited, and long-term availability cannot be guaranteed. The OPA2140AID, classified as active, receives continued manufacturing support and is recommended for new designs and production transitions.

Q: Does the OPA2140AID support the same supply voltage range as the OPA2111KM?

A: The OPA2140AID supports a wider supply voltage range (4.5V to 36V) compared to the OPA2111KM (10V to 36V). This extended lower limit provides additional design flexibility for low-voltage applications while maintaining full compatibility with the original 10V to 36V operating range.

Q: What mounting considerations apply when transitioning from OPA2111KM to OPA2140AID?

A: The OPA2111KM uses through-hole TO-99-8 metal can packaging suitable for manual insertion and wave soldering. The OPA2140AID uses surface-mount 8-SOIC packaging requiring SMT assembly equipment and reflow soldering processes. Design and manufacturing process changes are required for this transition.

Q: Are there any temperature range differences between these devices?

A: Yes. The OPA2111KM operates across 0°C to 70°C, while the OPA2140AID operates across -40°C to 125°C. The OPA2140AID supports extended temperature range operation, enabling use in wider environmental conditions.

Q: How do the supply current specifications compare?

A: The OPA2111KM draws 5 mA per channel, while the OPA2140AID draws 1.8 mA per channel. The OPA2140AID provides 64% lower supply current consumption, reducing power dissipation and thermal load in battery-powered or power-constrained applications.