OPA2684IDR Equivalent & Substitute Parts

Part Overview

The OPA2684IDR is a current feedback amplifier (CFA) manufactured by Texas Instruments, featuring two circuits in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. The OPA2684IDR delivers high-speed amplification with a 1.9 GHz gain bandwidth product and 780 V/µs slew rate, suitable for applications requiring differential output configurations and wide supply voltage operation.

Substiute Parts

OPA2684IDR

Texas InstrumentsIn Stock: 3617OPA2684IDR Datasheet

Current PartRFQ

AD8008ARZ

Analog Devices Inc.In Stock: 1680AD8008ARZ Datasheet

MFR RecommendedRFQ

AD8008ARZ-REEL

Analog Devices Inc.In Stock: 2112AD8008ARZ-REEL Datasheet

MFR RecommendedRFQ

AD8008ARZ-REEL7

Analog Devices Inc.In Stock: 1572AD8008ARZ-REEL7 Datasheet

MFR RecommendedRFQ

EL5263ISZ

Renesas Electronics CorporationIn Stock: 3610EL5263ISZ Datasheet

MFR RecommendedRFQ

EL5263ISZ-T7

Renesas Electronics CorporationIn Stock: 3191EL5263ISZ-T7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA2684IDR is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Amplifier Type: Current Feedback (mandatory)
• Number of Circuits: 2 (mandatory)
• Package / Case: 8-SOIC form factor (mandatory)
• Mounting Type: Surface Mount (mandatory)
• Operating Temperature Range: -40°C to 85°C (mandatory)
• Voltage Supply Span: Minimum 2.8 V to Maximum 12 V (mandatory)

Secondary Compatibility Parameters:

• Slew Rate: 780 V/µs or higher
• Gain Bandwidth Product: 1.9 GHz or higher
• -3dB Bandwidth: 250 MHz or higher
• Current - Output / Channel: 160 mA or higher
• Current - Supply: 1.7 mA per channel or lower (power efficiency consideration)
• Input Bias Current: 5 µA or lower
• Input Offset Voltage: 1.5 mV or lower

Substitute parts must satisfy all primary criteria and maintain compatibility with secondary parameters to ensure functional equivalence in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

Active Product Status Preference: The AD8008ARZ, AD8008ARZ-REEL, and AD8008ARZ-REEL7 variants from Analog Devices Inc. maintain active product status, ensuring long-term availability, manufacturing support, and technical documentation continuity. These parts are recommended for new designs and ongoing production requirements.

Supply Voltage Consideration: The OPA2684IDR operates with a minimum supply voltage of 2.8 V, while all substitute parts require a minimum of 5 V. Designs operating below 5 V supply voltage cannot use these substitutes without circuit modification.

Moisture Sensitivity Level (MSL): The AD8008ARZ variants feature MSL 1 (Unlimited), providing superior moisture resistance compared to the OPA2684IDR (MSL 2, 1 Year). The EL5263ISZ-T7 also achieves MSL 1 (Unlimited). These ratings are advantageous for extended storage and high-humidity manufacturing environments.

Compliance and Regulatory Status: All substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the regulatory profile of the OPA2684IDR. ECCN and HTSUS classifications are identical across all parts.

Performance Trade-offs: The AD8008ARZ series delivers higher slew rate (1000 V/µs vs. 780 V/µs) and doubled -3dB bandwidth (500 MHz vs. 250 MHz), with improved input offset voltage (0.5 mV vs. 1.5 mV). However, supply current per channel increases from 1.7 mA to 9 mA, and output current per channel decreases from 160 mA to 130 mA.

The EL5263ISZ and EL5263ISZ-T7 from Renesas offer exceptional slew rate (4000 V/µs) and lower supply current (1.5 mA per channel), but are classified as obsolete products with reduced long-term availability assurance.

Frequently Asked Questions (FAQ)

Q: Can the AD8008ARZ directly replace the OPA2684IDR in existing designs?

A: Direct replacement is possible only if the circuit design operates at supply voltages of 5 V or higher. The OPA2684IDR supports 2.8 V minimum supply, while AD8008ARZ requires 5 V minimum. Pin-to-pin compatibility is maintained through the 8-SOIC package format. Performance improvements in bandwidth and slew rate are generally beneficial for signal integrity.

Q: What is the significance of the packaging format differences (Tube, Tape & Reel, Cut Tape)?

A: Packaging format affects procurement and assembly processes. Tube packaging is suitable for manual handling and small-volume applications. Tape & Reel (TR) format is optimized for automated pick-and-place assembly in high-volume production. Cut Tape (CT) provides intermediate flexibility. The electrical performance of the component is independent of packaging format; selection depends on manufacturing process requirements.

Q: Why do the AD8008ARZ variants show higher supply current consumption?

A: The AD8008ARZ series achieves higher bandwidth (500 MHz vs. 250 MHz) and faster slew rate (1000 V/µs vs. 780 V/µs) through increased quiescent current per channel (9 mA vs. 1.7 mA). This represents a design trade-off between power consumption and signal fidelity. Applications with strict power budgets should evaluate this parameter carefully.

Q: Are the EL5263ISZ variants suitable for new production designs?

A: The EL5263ISZ and EL5263ISZ-T7 are classified as obsolete products. While currently in stock (3526 and 3146 units respectively), long-term availability and manufacturing support cannot be assured. These parts are appropriate for legacy system maintenance and repair applications, but active product alternatives (AD8008ARZ series) are recommended for new designs requiring sustained production support.

Q: What does MSL 1 (Unlimited) mean compared to MSL 2 (1 Year)?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient moisture before soldering. MSL 1 (Unlimited) means the component has no time restriction and can be stored indefinitely under standard conditions. MSL 2 (1 Year) requires soldering within one year of package opening. The AD8008ARZ variants and EL5263ISZ-T7 offer superior moisture tolerance, reducing risk in extended storage scenarios.

Q: Can output current differences affect circuit performance?

A: Output current per channel differs across substitutes: OPA2684IDR (160 mA), AD8008ARZ series (130 mA), and EL5263ISZ series (100 mA). Applications requiring maximum output current near these limits must verify that the selected substitute provides sufficient drive capability. Most general-purpose amplifier applications operate well below these limits and are unaffected by these differences.

Q: Is the differential output type of the OPA2684IDR maintained in all substitutes?

A: The OPA2684IDR explicitly specifies differential output type. The substitute parts (AD8008ARZ series and EL5263ISZ series) do not specify output type in the provided parameters. Circuit compatibility must be verified through detailed datasheet review to confirm output configuration alignment with the original design.