OPA2684IDRG4 Equivalent & Substitute Parts

Part Overview

The OPA2684IDRG4 is a current feedback amplifier integrated circuit manufactured by Texas Instruments, configured as a dual-channel operational amplifier in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and production continuity. The OPA2684IDRG4 delivers high-speed amplification with a gain bandwidth product of 1.9 GHz and slew rate of 780V/µs, suitable for applications requiring differential output configurations and wide supply voltage operation.

Substiute Parts

OPA2684IDRG4

Texas InstrumentsIn Stock: 3357OPA2684IDRG4 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 OPA2684IDRG4 is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width to ensure PCB footprint compatibility.

Amplifier Architecture: Current feedback amplifier topology is required to maintain functional equivalence in high-speed signal processing applications.

Dual-Channel Configuration: The substitute must provide two independent amplifier circuits within a single package.

Supply Voltage Range: The substitute must operate within the specified supply voltage span. The OPA2684IDRG4 operates from 2.8V to 12V; substitutes with minimum supply requirements of 5V or higher remain compatible for applications using standard supply rails.

Operating Temperature Range: All substitutes must support the -40°C to 85°C operating temperature specification.

Electrical Performance Envelope: Substitutes must meet or exceed the slew rate (780V/µs minimum), bandwidth (-3dB ≥ 250 MHz), and output current (≥ 160 mA per channel) specifications to ensure functional replacement without circuit redesign.

Compliance Requirements: RoHS3 compliance and REACH unaffected status are mandatory for production use.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: AD8008ARZ Series

The AD8008ARZ, AD8008ARZ-REEL, and AD8008ARZ-REEL7 from Analog Devices Inc. are the preferred substitutes for the OPA2684IDRG4. These parts are in active production status, ensuring long-term availability and supply chain stability. All three variants share identical electrical specifications and differ only in packaging format (Tube, Tape & Reel, and Tape & Reel with 7-inch reel respectively). The AD8008ARZ series exceeds the OPA2684IDRG4 performance envelope with a slew rate of 1000V/µs (versus 780V/µs), -3dB bandwidth of 500 MHz (versus 250 MHz), and lower input offset voltage of 500µV (versus 1.5mV). The minimum supply voltage requirement of 5V is compatible with standard industrial and commercial supply rails. RoHS3 compliance and unlimited moisture sensitivity level (MSL 1) provide superior handling and storage characteristics compared to the original part.

Secondary Recommendation: EL5263ISZ-T7

The EL5263ISZ-T7 from Renesas Electronics Corporation offers exceptional slew rate performance at 4000V/µs and maintains 500 MHz bandwidth. This part is suitable for applications requiring maximum transient response speed. However, the EL5263ISZ-T7 is classified as obsolete, limiting its use to legacy system maintenance or existing inventory utilization. The part exhibits lower supply current consumption (1.5mA versus 1.7mA) and reduced output current per channel (100mA versus 160mA), which may constrain applications requiring maximum output drive capability. The EL5263ISZ-T7 provides unlimited moisture sensitivity level (MSL 1), superior to the original OPA2684IDRG4 specification.

Tertiary Option: EL5263ISZ

The EL5263ISZ (Tube packaging variant) shares identical electrical specifications with EL5263ISZ-T7 but carries MSL 3 (168 Hours) moisture sensitivity, requiring more stringent handling and storage protocols. This part is obsolete and should be reserved for applications where existing inventory exists or where the specific packaging format is mandated.

Supply Voltage Consideration

Applications operating at supply voltages below 5V cannot use the AD8008ARZ series or EL5263 variants without circuit modification. In such cases, the OPA2684IDRG4 remains the only specified option from the provided substitute list. Alternative sourcing or circuit redesign to accommodate higher supply voltages is necessary for obsolete part replacement in low-voltage applications.

Frequently Asked Questions (FAQ)

Q1: Can the AD8008ARZ directly replace the OPA2684IDRG4 without PCB modifications?

A: Yes, the AD8008ARZ is a direct pin-compatible replacement. Both devices use the 8-SOIC package with identical pinout and footprint dimensions (0.154" width, 3.90mm). No PCB layout changes are required. However, the AD8008ARZ requires a minimum supply voltage of 5V, whereas the OPA2684IDRG4 operates from 2.8V. Verify that your power supply meets this requirement before substitution.

Q2: What is the difference between AD8008ARZ, AD8008ARZ-REEL, and AD8008ARZ-REEL7?

A: These three part numbers represent the same integrated circuit with different packaging and delivery formats. AD8008ARZ is supplied in Tube packaging for manual handling and small-quantity applications. AD8008ARZ-REEL and AD8008ARZ-REEL7 are supplied on Tape & Reel for automated assembly, with the -REEL7 variant specifying a 7-inch reel format. Electrical specifications and performance are identical across all three variants. Selection depends on your assembly process requirements and quantity needs.

Q3: Why does the EL5263ISZ-T7 have a higher slew rate than the AD8008ARZ?

A: The EL5263ISZ-T7 achieves 4000V/µs slew rate through different internal circuit design and compensation topology compared to the AD8008ARZ at 1000V/µs. Higher slew rate enables faster transient response but may introduce different noise characteristics and stability margins depending on circuit configuration. Verify that your application benefits from this performance increase and that stability is maintained with your specific feedback network.

Q4: Can I use the EL5263ISZ or EL5263ISZ-T7 as a substitute if the OPA2684IDRG4 is obsolete?

A: The EL5263 variants are also classified as obsolete, making them unsuitable for new production designs requiring long-term component availability. These parts should only be considered for legacy system maintenance or if existing inventory is available. For new designs, the active AD8008ARZ series is the recommended choice to ensure supply chain continuity.

Q5: What does MSL (Moisture Sensitivity Level) mean, and why does it matter?

A: MSL indicates the maximum time a component can be exposed to ambient moisture before soldering without risk of damage. MSL 1 (Unlimited) means the part can be stored indefinitely without moisture control. MSL 2 (1 Year) requires storage in dry conditions for up to one year. MSL 3 (168 Hours) requires storage in dry conditions for up to one week. The AD8008ARZ series (MSL 1) offers superior handling flexibility compared to the OPA2684IDRG4 (MSL 2) and EL5263ISZ (MSL 3).

Q6: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed (AD8008ARZ, AD8008ARZ-REEL, AD8008ARZ-REEL7, EL5263ISZ, and EL5263ISZ-T7) are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for commercial and industrial applications.

Q7: What is the impact of lower output current in the EL5263 variants?

A: The EL5263 series provides 100mA output current per channel compared to 160mA in the OPA2684IDRG4 and 130mA in the AD8008ARZ. This reduction limits the maximum load current that can be driven directly from the amplifier output. Applications requiring high output current must either use external buffer stages or select the AD8008ARZ series to maintain the original output drive capability.

Q8: Can I mix different substitute parts in the same design?

A: Yes, all substitute parts share identical pinout and package format, allowing mixed usage within the same PCB assembly. However, ensure that your circuit design accommodates the minimum supply voltage requirement of 5V for all active substitutes (AD8008ARZ series). Mixing parts with different performance characteristics (slew rate, bandwidth, output current) may introduce performance variations across channels or boards.