OPA3684IDR Equivalent & Substitute Parts

Part Overview

The OPA3684IDR is a current feedback amplifier integrated circuit manufactured by Texas Instruments, containing three independent amplifier circuits in a 14-SOIC surface mount package. This device is classified as Active product status and is RoHS3 compliant. The OPA3684IDR is utilized in high-speed signal conditioning applications requiring current feedback topology with a gain bandwidth product of 1.9 GHz and slew rate of 780V/µs. Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameter ranges for this linear amplifier category.

Substiute Parts

OPA3684IDR

Texas InstrumentsIn Stock: 3387OPA3684IDR Datasheet

Current PartRFQ

ADA4861-3YRZ

Analog Devices Inc.In Stock: 1397ADA4861-3YRZ Datasheet

MFR RecommendedRFQ

ADA4861-3YRZ-RL7

Analog Devices Inc.In Stock: 18359ADA4861-3YRZ-RL7 Datasheet

MFR RecommendedRFQ

ADA4862-3YRZ

Analog Devices Inc.In Stock: 3655ADA4862-3YRZ Datasheet

MFR RecommendedRFQ

ADA4862-3YRZ-RL

Analog Devices Inc.In Stock: 852ADA4862-3YRZ-RL Datasheet

MFR RecommendedRFQ

ADA4862-3YRZ-RL7

Analog Devices Inc.In Stock: 15778ADA4862-3YRZ-RL7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the OPA3684IDR are identified based on strict compatibility within the following allowed parameters:

Package Compatibility: All substitute parts must use the 14-SOIC surface mount package with 0.154" (3.90mm) width to ensure mechanical and electrical pin compatibility.

Circuit Count: All substitute parts contain three independent amplifier circuits, matching the OPA3684IDR configuration.

Supply Voltage Range: Substitute parts must operate within the OPA3684IDR supply voltage specification of 2.8V to 12V minimum and maximum, or within a compatible subset of this range.

Mounting Type: All substitute parts are surface mount devices compatible with automated assembly processes.

Compliance Standards: All substitute parts maintain RoHS3 compliance and EAR99 export classification, consistent with the main part.

Product Status: All substitute parts are classified as Active, ensuring continued availability and manufacturer support.

The substitute parts are grouped into two categories based on amplifier topology: Current Feedback Amplifiers (ADA4861 series) and General Purpose Amplifiers (ADA4862 series). Both categories share the same package, circuit count, and compliance profile as the OPA3684IDR.

Parameter Comparison

Engineering Selection Recommendations

Current Feedback Topology Substitutes (ADA4861-3YRZ Series):

The ADA4861-3YRZ and ADA4861-3YRZ-RL7 maintain current feedback amplifier topology identical to the OPA3684IDR. These parts are suitable for applications where current feedback architecture is required. The ADA4861-3YRZ-RL7 variant offers higher inventory availability (18,300 pcs) compared to the tube-packaged ADA4861-3YRZ (1,310 pcs). Both variants provide improved input offset voltage (100 µV versus 1.5 mV) and lower input bias current (2.9 µA versus 5 µA). Operating temperature range extends to 105°C, exceeding the OPA3684IDR specification of 85°C. Minimum supply voltage requirement increases to 5V, which must be verified against system design specifications that may utilize the OPA3684IDR's 2.8V minimum capability.

General Purpose Amplifier Substitutes (ADA4862-3YRZ Series):

The ADA4862-3YRZ, ADA4862-3YRZ-RL, and ADA4862-3YRZ-RL7 employ general purpose amplifier topology with enhanced bandwidth (720 MHz versus 250 MHz) and slew rate (1050V/µs versus 780V/µs). These parts deliver superior high-frequency performance characteristics. The ADA4862-3YRZ-RL7 variant provides maximum inventory availability (15,733 pcs). All ADA4862 variants feature significantly lower input bias current (600 nA) and improved moisture sensitivity rating (MSL 1 Unlimited versus MSL 2 1 Year). Minimum supply voltage requirement is 5V, consistent with ADA4861 series.

Compliance and Availability:

All substitute parts maintain Active product status, RoHS3 compliance, and EAR99 export classification. Selection between variants should consider packaging requirements (Tube, Cut Tape & Digi-Reel, or Tape & Reel) and inventory availability for procurement timelines.

Frequently Asked Questions (FAQ)

Q: Can the ADA4861-3YRZ directly replace the OPA3684IDR in all applications?

A: The ADA4861-3YRZ shares identical package, circuit count, and current feedback topology with the OPA3684IDR. However, the minimum supply voltage increases from 2.8V to 5V. Applications operating below 5V supply voltage cannot use this substitute. Pin-to-pin compatibility exists for the 14-SOIC package.

Q: What is the difference between ADA4861-3YRZ and ADA4861-3YRZ-RL7?

A: Both parts are electrically identical current feedback amplifiers with matching electrical specifications. The difference is packaging format: ADA4861-3YRZ is supplied in Tube packaging, while ADA4861-3YRZ-RL7 uses Cut Tape & Digi-Reel packaging. ADA4861-3YRZ-RL7 offers significantly higher inventory availability (18,300 pcs versus 1,310 pcs).

Q: Why do the ADA4862 parts have higher bandwidth and slew rate than the OPA3684IDR?

A: The ADA4862 series employs general purpose amplifier topology, which differs from the current feedback architecture of the OPA3684IDR. General purpose topology enables higher bandwidth (720 MHz) and slew rate (1050V/µs) performance. This topology difference means the ADA4862 is not a direct pin-compatible substitute but rather an alternative for applications where general purpose amplifier characteristics are acceptable.

Q: What is the impact of the 5V minimum supply voltage requirement on substitution?

A: The OPA3684IDR operates with a minimum supply voltage of 2.8V, while all Analog Devices substitute parts require a minimum of 5V. Applications designed for 2.8V to 5V operation cannot use these substitutes. System power supply specifications must be verified before selection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (ADA4861-3YRZ, ADA4861-3YRZ-RL7, ADA4862-3YRZ, ADA4862-3YRZ-RL, ADA4862-3YRZ-RL7) are RoHS3 compliant and maintain EAR99 export classification, consistent with the OPA3684IDR.

Q: What does Moisture Sensitivity Level (MSL) mean for component selection?

A: MSL rating indicates moisture absorption sensitivity during storage and handling. The OPA3684IDR has MSL 2 (1 Year), requiring reflow within one year of opening the package. All substitute parts have MSL 1 (Unlimited), providing extended shelf life without time-based reflow requirements. This represents an improvement in handling flexibility.

Q: Can I use ADA4862-3YRZ-RL in place of ADA4862-3YRZ-RL7?

A: Both parts are electrically identical general purpose amplifiers with matching specifications. The difference is packaging: ADA4862-3YRZ-RL uses Tape & Reel (TR) packaging with 781 pcs inventory, while ADA4862-3YRZ-RL7 uses an alternative packaging format with 15,733 pcs inventory. Selection depends on procurement requirements and assembly equipment compatibility.

Q: What is the significance of the 14-SOIC package specification?

A: The 14-SOIC (Small Outline Integrated Circuit) package with 0.154" (3.90mm) width is a standard surface mount package. All substitute parts use this identical package, ensuring mechanical and electrical pin compatibility. PCB footprints and assembly processes remain unchanged during substitution.