OPA2686U Equivalent & Substitute Parts

Part Overview

The OPA2686U is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, containing 2 circuits in an 8-SOIC surface mount package. This device is classified as obsolete, indicating it is no longer in active production. The OPA2686U operates within a supply voltage range of 9V to 12V and is designed for applications requiring high-speed voltage feedback amplification with a gain bandwidth product of 1.6 GHz.

Due to its obsolete status, locating replacement units from original inventory becomes increasingly difficult. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications currently utilizing the OPA2686U.

Substiute Parts

OPA2686U

Texas InstrumentsIn Stock: 2543OPA2686U Datasheet

Current PartRFQ

OPA2846ID

Texas InstrumentsIn Stock: 1079OPA2846ID Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA2686U is determined by strict compatibility across the following critical parameters:

Functional Parameters:

• Amplifier Type: Voltage Feedback (must match)
• Number of Circuits: 2 (must match)
• Package / Case: 8-SOIC (must match for PCB compatibility)
• Mounting Type: Surface Mount (must match)

Electrical Performance Parameters:

• Slew Rate: 600 V/µs (must match or exceed)
• Gain Bandwidth Product: 1.6 GHz (must match or exceed)
• Current - Input Bias: 10 µA (must match or be lower)
• Current - Output / Channel: 80 mA (must match or exceed)
• Operating Temperature Range: -40°C to 85°C (must match or exceed)

Supply Voltage Compatibility:

• The substitute part must operate within the supply voltage range of the original design. The OPA2686U operates from 9V to 12V.

The OPA2846ID meets all substitution criteria as a direct replacement for the OPA2686U, with identical package, circuit count, and core electrical specifications. The OPA2846ID additionally provides improved performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

OPA2846ID as Direct Substitute:

The OPA2846ID is the manufacturer-recommended substitute for the OPA2686U. This substitution is supported by:

1. Identical Functional Architecture: Both devices are dual-channel voltage feedback amplifiers in 8-SOIC packages with matching circuit counts and core electrical specifications.

2. Pin-Compatible Package: The 8-SOIC (0.154", 3.90mm Width) package is identical, enabling direct PCB-level replacement without layout modifications.

3. Electrical Performance Equivalence: The OPA2846ID maintains all critical electrical parameters at or above the OPA2686U specifications, including slew rate (600 V/µs), input bias current (10 µA), and output current per channel (80 mA).

4. Enhanced Performance Characteristics: The OPA2846ID provides improved input offset voltage (150 µV versus 350 µV) and slightly higher gain bandwidth product (1.65 GHz versus 1.6 GHz), delivering superior performance in the same form factor.

5. Expanded Supply Voltage Range: The OPA2846ID operates from 5V to 12V, providing greater design flexibility compared to the OPA2686U's 9V to 12V range. Designs operating at 9V to 12V remain fully compatible.

6. Active Product Status: The OPA2846ID is in active production, ensuring long-term availability and supply chain continuity.

7. Regulatory Compliance: The OPA2846ID is RoHS3 compliant, addressing modern environmental and regulatory requirements that the obsolete OPA2686U does not meet.

Frequently Asked Questions (FAQ)

Q: Can the OPA2846ID be used as a direct replacement for the OPA2686U without circuit modifications?

A: Yes. The OPA2846ID is pin-compatible and functionally equivalent to the OPA2686U. Both devices are dual-channel voltage feedback amplifiers in identical 8-SOIC packages. No circuit modifications are required for substitution.

Q: What are the key differences between the OPA2686U and OPA2846ID?

A: The primary differences are: (1) Product Status—OPA2846ID is active while OPA2686U is obsolete; (2) Input Offset Voltage—OPA2846ID specifies 150 µV versus OPA2686U's 350 µV; (3) Gain Bandwidth Product—OPA2846ID is 1.65 GHz versus OPA2686U's 1.6 GHz; (4) Minimum Supply Voltage—OPA2846ID operates from 5V while OPA2686U requires 9V minimum; (5) RoHS Compliance—OPA2846ID is RoHS3 compliant while OPA2686U is non-compliant.

Q: Are there any supply voltage compatibility concerns when substituting the OPA2846ID for the OPA2686U?

A: No compatibility concerns exist for designs operating within the OPA2686U's original 9V to 12V range. The OPA2846ID's expanded 5V to 12V operating range is a superset of the original specification, ensuring full compatibility with existing power supply designs.

Q: Does the improved input offset voltage of the OPA2846ID affect circuit performance?

A: The OPA2846ID's lower input offset voltage (150 µV versus 350 µV) represents an improvement. This lower offset reduces DC error in precision applications. Existing circuit designs will continue to function correctly, with potential performance enhancement in offset-sensitive applications.

Q: What is the significance of the OPA2846ID's RoHS3 compliance?

A: RoHS3 compliance indicates the OPA2846ID meets current environmental and regulatory standards for hazardous substance restrictions. This is relevant for applications subject to regulatory requirements or customer specifications mandating RoHS compliance. The obsolete OPA2686U does not meet these standards.

Q: Is the OPA2846ID available in the same packaging options as the OPA2686U?

A: Both devices are available in 8-SOIC surface mount packages with identical physical dimensions (0.154", 3.90mm Width). The OPA2846ID is supplied in Tube packaging, while the OPA2686U was supplied in standard packaging. The physical package dimensions are identical for PCB compatibility.

Q: Can the OPA2846ID be used in applications originally designed for the OPA2686U without performance degradation?

A: Yes. The OPA2846ID meets or exceeds all electrical specifications of the OPA2686U. Performance will be equivalent or improved. The higher gain bandwidth product and lower input offset voltage represent performance enhancements over the original design.