OPA861IDR Equivalent & Substitute Parts

Part Overview

The OPA861IDR is a transconductance amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. The OPA861IDR operates across a supply voltage range of 4V to 12.6V with a slew rate of 900V/µs and gain bandwidth product of 80 MHz, serving applications requiring transconductance amplification in compact form factors.

Substiute Parts

OPA861IDR

Texas InstrumentsIn Stock: 716OPA861IDR Datasheet

Current PartRFQ

AD9631ARZ-REEL

Analog Devices Inc.In Stock: 2876AD9631ARZ-REEL Datasheet

MFR RecommendedRFQ

OPA861ID

Texas InstrumentsIn Stock: 1211OPA861ID Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA861IDR is determined by strict alignment of electrical and mechanical parameters within the linear amplifier category. The primary substitution criteria are:

Mechanical Compatibility: All substitute parts must use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width to ensure PCB layout compatibility without redesign.

Electrical Operating Range: Substitute parts must support the required supply voltage span. The OPA861IDR operates from 4V to 12.6V; substitute parts must accommodate this range or a compatible subset.

Amplifier Architecture: The OPA861IDR is a transconductance amplifier. Substitutes may include alternative amplifier topologies (such as voltage feedback) provided they meet the functional requirements of the application circuit.

Thermal and Environmental Specifications: Operating temperature range of -40°C to 85°C and compliance certifications (RoHS3, REACH Unaffected, EAR99) establish baseline environmental compatibility.

Product Status Consideration: The OPA861IDR is obsolete; active product alternatives ensure long-term supply chain viability.

Parameter Comparison

Engineering Selection Recommendations

OPA861ID (Primary Substitute): This part is the direct equivalent to OPA861IDR, manufactured by Texas Instruments with identical electrical specifications and package configuration. The OPA861ID is active in production, ensuring supply chain continuity. The only difference is packaging format (Tube versus Tape & Reel), which does not affect electrical performance or PCB integration. This substitute is recommended for applications requiring exact functional replacement with no circuit redesign.

AD9631ARZ-REEL (Alternative Substitute): This Analog Devices component offers enhanced performance characteristics, including higher slew rate (1300V/µs versus 900V/µs) and significantly higher gain bandwidth product (320 MHz versus 80 MHz). However, the AD9631ARZ-REEL employs voltage feedback amplifier architecture rather than transconductance topology. This substitute is suitable only when the application circuit can accommodate the different amplifier architecture and higher performance envelope. The AD9631ARZ-REEL has a minimum supply voltage of 6V, which may not be compatible with applications requiring 4V operation. The improved moisture sensitivity level (MSL 1 Unlimited) provides superior handling characteristics compared to the OPA861IDR (MSL 2, 1 Year).

Both substitutes maintain RoHS3 compliance, REACH Unaffected status, and EAR99 export classification, ensuring regulatory alignment with the original OPA861IDR.

Frequently Asked Questions (FAQ)

Q: Can OPA861ID be used as a direct replacement for OPA861IDR without circuit modification?

A: Yes. The OPA861ID is electrically and functionally identical to the OPA861IDR. Both are transconductance amplifiers with the same slew rate (900V/µs), gain bandwidth product (80 MHz), supply voltage range (4V to 12.6V), and operating temperature specifications (-40°C to 85°C). The only difference is packaging format (Tube versus Tape & Reel), which does not affect circuit performance or PCB layout.

Q: What are the key differences between OPA861ID and AD9631ARZ-REEL?

A: The primary differences are amplifier architecture and performance specifications. OPA861ID is a transconductance amplifier with 900V/µs slew rate and 80 MHz bandwidth. AD9631ARZ-REEL is a voltage feedback amplifier with 1300V/µs slew rate and 320 MHz bandwidth. Additionally, AD9631ARZ-REEL requires a minimum supply voltage of 6V, whereas OPA861ID operates from 4V. These differences mean AD9631ARZ-REEL is not a direct pin-compatible replacement and may require circuit redesign.

Q: Is the AD9631ARZ-REEL suitable for applications designed for the OPA861IDR?

A: Substitution depends on application requirements. If the circuit is designed specifically for transconductance amplifier characteristics and operates at supply voltages below 6V, the AD9631ARZ-REEL is not suitable without circuit redesign. If the application can tolerate voltage feedback architecture and operates at 6V or higher, the AD9631ARZ-REEL offers superior performance. Circuit analysis is required to determine compatibility.

Q: Are all three parts (OPA861IDR, OPA861ID, AD9631ARZ-REEL) pin-compatible?

A: Yes, all three parts use the 8-SOIC package with identical pinout and physical dimensions (0.154" width, 3.90mm). Pin compatibility is confirmed. However, electrical compatibility depends on circuit design and application requirements, as noted above.

Q: What is the significance of the OPA861IDR being classified as obsolete?

A: Obsolete status indicates Texas Instruments has discontinued production and support for the OPA861IDR. The OPA861ID (active status) is the recommended replacement for new designs and ongoing production. Existing inventory of OPA861IDR may be available from distributors, but long-term supply cannot be guaranteed.

Q: How do the moisture sensitivity levels (MSL) affect component handling?

A: OPA861IDR and OPA861ID have MSL 2 (1 Year), requiring controlled storage and handling within one year of manufacture. AD9631ARZ-REEL has MSL 1 (Unlimited), allowing indefinite storage without moisture sensitivity concerns. For applications with extended component shelf life requirements, AD9631ARZ-REEL offers superior handling characteristics.

Q: Are all three parts RoHS3 compliant?

A: Yes. OPA861IDR, OPA861ID, and AD9631ARZ-REEL are all ROHS3 Compliant and REACH Unaffected, meeting environmental and regulatory requirements for EU and global markets.