OPA111AM Equivalent & Substitute Parts

Part Overview

The OPA111AM is a general-purpose operational amplifier manufactured by Texas Instruments, housed in a TO-99-8 metal can package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The OPA111AM features a Difet® input stage with extremely low input bias current (0.8 pA) and operates across a wide supply voltage range of 10 V to 36 V. Due to its obsolete status, active substitute parts with compatible electrical and mechanical characteristics are required for new designs and production continuity.

Substiute Parts

OPA111AM

Texas InstrumentsIn Stock: 2219OPA111AM Datasheet

Current PartRFQ

OPA140AID

Texas InstrumentsIn Stock: 2229OPA140AID Datasheet

MFR RecommendedRFQ

JM38510/11405BGA

Analog Devices Inc.In Stock: 1435JM38510/11405BGA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA111AM is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Single-circuit operational amplifier architecture
• Input bias current in the picoampere range (ultra-low bias)
• Supply voltage range spanning minimum 10 V to maximum 36 V
• Output current capability of at least 10 mA per channel
• Operating temperature range encompassing -25°C to 85°C

Mechanical Compatibility Criteria:

• Package type and pin configuration
• Mounting technology (through-hole or surface-mount with adapter consideration)

Compliance Criteria:

• RoHS3 compliance
• REACH unaffected status
• ECCN EAR99 classification

Two substitute parts are identified:

1. OPA140AID (Texas Instruments): Active product with J-FET input stage, enhanced performance specifications, surface-mount 8-SOIC package. Electrical parameters exceed OPA111AM requirements; package differs.

2. JM38510/11405BGA (Analog Devices Inc.): Active military-grade product with J-FET input stage, TO-99-8 metal can package matching OPA111AM. Qualified to MIL-M-38510/114 standard; package identical.

Parameter Comparison

Engineering Selection Recommendations

OPA140AID Selection Criteria:

The OPA140AID is an active Texas Instruments product with enhanced electrical performance across all measured parameters. It provides superior slew rate (20 V/µs vs. 2 V/µs), higher gain bandwidth product (11 MHz vs. 2 MHz), and greater output current capability (36 mA vs. 10 mA). Input bias current is lower (0.5 pA vs. 0.8 pA) and input offset voltage is reduced (30 µV vs. 100 µV). The device maintains full supply voltage compatibility (4.5 V to 36 V) and extends operating temperature range to -40°C to 125°C. RoHS3 compliance and REACH unaffected status are maintained. The primary consideration is package change from TO-99-8 through-hole to 8-SOIC surface-mount, requiring PCB redesign and assembly process modification.

JM38510/11405BGA Selection Criteria:

The JM38510/11405BGA is an active military-grade product from Analog Devices Inc. with identical TO-99-8 metal can package and through-hole mounting, eliminating mechanical redesign requirements. It maintains supply voltage compatibility (10 V to 40 V) and extends operating temperature range to -55°C to 125°C. The device is qualified to MIL-M-38510/114 military standard. RoHS3 compliance and REACH unaffected status are maintained. Electrical performance includes higher slew rate (10 V/µs vs. 2 V/µs) and greater output current (50 mA vs. 10 mA). Input bias current is higher (100 pA vs. 0.8 pA) and input offset voltage is significantly higher (2 mV vs. 100 µV), which may impact precision analog applications.

Selection Logic:

• For direct mechanical replacement with minimal redesign: JM38510/11405BGA
• For enhanced performance with PCB redesign capability: OPA140AID
• For military or aerospace applications: JM38510/11405BGA

Frequently Asked Questions (FAQ)

Q: Can OPA140AID directly replace OPA111AM without PCB modification?

A: No. The OPA140AID uses an 8-SOIC surface-mount package, while the OPA111AM uses a TO-99-8 through-hole metal can package. PCB layout and assembly process changes are required. A surface-mount to through-hole adapter may be used as a temporary solution, but this is not recommended for production designs.

Q: Is JM38510/11405BGA a pin-for-pin replacement for OPA111AM?

A: Yes. Both devices use the TO-99-8 metal can package with identical pin configuration and through-hole mounting. No PCB redesign is required for mechanical compatibility.

Q: What are the key electrical differences between OPA111AM and its substitutes?

A: OPA140AID provides superior performance: 10× higher slew rate, 5.5× higher gain bandwidth product, and 3.6× higher output current. JM38510/11405BGA offers 5× higher slew rate and 5× higher output current, but with higher input bias current (100 pA vs. 0.8 pA) and input offset voltage (2 mV vs. 100 µV). For precision applications requiring ultra-low bias current and offset voltage, OPA111AM performance characteristics may not be fully matched by either substitute.

Q: Are all three parts RoHS3 compliant?

A: Yes. OPA111AM, OPA140AID, and JM38510/11405BGA are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Which substitute is better for low-power applications?

A: OPA140AID has the lowest supply current (1.8 mA vs. 2.5 mA for OPA111AM). JM38510/11405BGA supply current is not specified in available data. For power-constrained designs, OPA140AID is the preferred choice if package change is acceptable.

Q: Can I use OPA140AID in a military or aerospace application?

A: OPA140AID is an active commercial-grade product. JM38510/11405BGA is qualified to MIL-M-38510/114 military standard and is the appropriate choice for military or aerospace applications requiring military-grade qualification.

Q: What is the temperature range difference between OPA111AM and its substitutes?

A: OPA111AM operates from -25°C to 85°C. OPA140AID extends this to -40°C to 125°C. JM38510/11405BGA extends this to -55°C to 125°C. Both substitutes support wider temperature ranges, providing greater operational flexibility.