OPA2111AM Equivalent & Substitute Parts

Part Overview

The OPA2111AM is a general-purpose operational amplifier manufactured by Texas Instruments, featuring a dual-circuit configuration in a TO-99-8 metal can package. This device is classified as obsolete, indicating discontinued production and limited availability for new designs. The OPA2111AM operates across a wide supply voltage range of 10V to 36V and is suitable for applications requiring low input bias current and moderate bandwidth performance.

Due to its obsolete status, identifying functionally compatible substitute components is essential for design continuity, procurement reliability, and long-term system support. Substitute parts must maintain electrical compatibility while accommodating potential package and performance differences.

Substiute Parts

OPA2111AM

Texas InstrumentsIn Stock: 2071OPA2111AM Datasheet

Current PartRFQ

OPA2140AID

Texas InstrumentsIn Stock: 2238OPA2140AID Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA2111AM is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Dual-circuit configuration (2 operational amplifiers per package)
• Supply voltage range compatibility (minimum 10V, maximum 36V)
• Input bias current characteristics (low-current JFET or DIFET input stage)
• Output current capability (minimum 10mA per channel)
• Operating temperature range overlap or extension

Package and Mounting Considerations:

• Original through-hole TO-99-8 package is obsolete; surface-mount alternatives are acceptable with appropriate PCB redesign
• Pin-compatible alternatives or functional equivalents with different packages require circuit board layout modification

Compliance and Certification:

• RoHS3 compliance maintained
• REACH unaffected status preserved

The OPA2140AID qualifies as a manufacturer-recommended substitute based on dual-circuit topology, overlapping supply voltage range (4.5V to 36V), superior electrical performance characteristics, and active product status with assured long-term availability.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The OPA2140AID is a valid substitute for the OPA2111AM based on the following factors:

1. Dual-Circuit Configuration: Both devices integrate two independent operational amplifiers, maintaining functional equivalence at the system level.

2. Supply Voltage Compatibility: The OPA2140AID operates across 4.5V to 36V, which encompasses the OPA2111AM's 10V to 36V range. Applications requiring the full 10V to 36V span remain compatible.

3. Enhanced Performance: The OPA2140AID delivers superior electrical characteristics including higher slew rate (20V/µs vs. 2V/µs), increased gain bandwidth product (11MHz vs. 2MHz), lower input bias current (0.5pA vs. 2pA), and reduced input offset voltage (30µV vs. 100µV). These improvements do not introduce incompatibility; they enhance system performance.

4. Increased Output Current: The OPA2140AID provides 36mA per channel versus 10mA, offering greater drive capability without reducing compatibility.

5. Product Status and Availability: The OPA2140AID holds active product status with assured manufacturing continuity and supply chain reliability, addressing the obsolescence risk of the OPA2111AM.

6. Compliance Certification: Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements.

Package Transition Consideration:

The OPA2140AID uses an 8-SOIC surface-mount package instead of the through-hole TO-99-8 package. This requires PCB redesign and assembly process modification. For applications where through-hole mounting is mandatory, alternative solutions must be evaluated.

Frequently Asked Questions (FAQ)

Q1: Can the OPA2140AID directly replace the OPA2111AM without PCB modification?

A: Electrical substitution is valid; however, package differences require PCB redesign. The OPA2111AM uses through-hole TO-99-8 mounting, while the OPA2140AID uses surface-mount 8-SOIC. Pin assignments differ, necessitating circuit board layout changes. Direct socket replacement is not possible.

Q2: What are the key electrical advantages of the OPA2140AID over the OPA2111AM?

A: The OPA2140AID provides 10× higher slew rate (20V/µs vs. 2V/µs), 5.5× higher gain bandwidth product (11MHz vs. 2MHz), 4× lower input bias current (0.5pA vs. 2pA), 3.3× lower input offset voltage (30µV vs. 100µV), and 3.6× higher output current per channel (36mA vs. 10mA). Supply current is reduced to 1.8mA per dual-channel configuration.

Q3: Are there supply voltage compatibility concerns when substituting the OPA2140AID?

A: The OPA2140AID operates from 4.5V minimum, which is lower than the OPA2111AM's 10V minimum. Applications using supply voltages between 4.5V and 10V can benefit from this extended range. Both devices support the 36V maximum, ensuring compatibility across the upper supply range.

Q4: Does the OPA2140AID maintain the same operating temperature range?

A: No. The OPA2111AM operates from -25°C to 85°C, while the OPA2140AID extends to -40°C to 125°C. The OPA2140AID covers the original temperature range and provides additional margin at both extremes, enhancing reliability in extreme environments.

Q5: What compliance certifications apply to both devices?

A: Both the OPA2111AM and OPA2140AID are ROHS3 compliant and REACH unaffected. They satisfy regulatory requirements for electronic component use in regulated markets.

Q6: Why is the OPA2111AM classified as obsolete?

A: Obsolete status indicates Texas Instruments has discontinued production. The OPA2140AID represents the active product line successor, offering superior performance and assured long-term availability.

Q7: Can the OPA2140AID be used in legacy equipment designed for the OPA2111AM?

A: Electrical substitution is valid for new circuit designs. For retrofit applications in existing equipment, package constraints and PCB layout compatibility must be evaluated. Through-hole socket compatibility is not available; surface-mount conversion or adapter solutions may be required.