Part A
AD8331ARQZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3550 PCS
- Package
- QSOP-20
- Series
- Linear - Amplifiers - Special Purpose
Replacement verdict
Compatible functional replacement candidate
The AD8331ARQZ and AD8331ARQZ-RL are functionally identical, differing only in packaging format. The AD8331ARQZ is supplied in tube packaging, while the AD8331ARQZ-RL is supplied in tape-and-reel packaging for automated assembly. Both parts share the same die, electrical specifications, and package outline, making them interchangeable for design and production purposes.
Function and Electrical Specifications
High match
Package Type and Footprint
High match
Operating Temperature Range
High match
Packaging Format
Validation required
Parts at a glance
Part B
AD8331ARQZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5392 PCS
- Package
- SSOP-20
- Series
- Linear - Amplifiers - Special Purpose
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8331ARQZ | AD8331ARQZ-RL | Why it matters |
|---|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | Same manufacturer ensures identical design, process, and quality standards. |
| Function | Ultrasound variable gain amplifier (VGA) with LNA and VGA | Ultrasound variable gain amplifier (VGA) with LNA and VGA | Identical core function confirms the parts are functionally interchangeable. |
| Package / Case | 20-Lead QSOP | 20-Lead QSOP | Same package footprint allows drop-in board replacement without layout changes. |
| Mounting Type | Surface Mount | Surface Mount | Consistent mounting method ensures compatibility with the same assembly process. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Matching supply requirements allow use in the same power rail design. |
| Number of Channels | 1 | 1 | Same channel count preserves signal chain architecture. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings ensure equivalent environmental robustness. |
| Packaging / Ordering Format | Tube / individual | Tape & Reel | Different packaging affects handling and assembly line feed method, though the die is identical. |
| RoHS Compliance | RoHS Compliant | RoHS Compliant | Both meet environmental regulations for lead-free manufacturing. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8331ARQZ | AD8331ARQZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | X-AMP® | X-AMP® |
| Part Status | Active | Active |
| Type | Variable Gain Amplifier | Variable Gain Amplifier |
| Applications | Signal Processing | Signal Processing |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between AD8331ARQZ and AD8331ARQZ-RL?
The AD8331ARQZ and AD8331ARQZ-RL are the same AD8331 device in the same 20-lead QSOP package. The suffix difference refers to packaging format: AD8331ARQZ is the standard tube packaging, while AD8331ARQZ-RL denotes tape-and-reel packaging for automated assembly. Electrical performance and functional specifications are identical.
Are the AD8331ARQZ and AD8331ARQZ-RL electrically and functionally identical?
Yes. Both part numbers refer to the same AD8331 ultralow noise variable gain amplifier (VGA) die and package. The only distinction is the shipping/packaging format (tube vs. tape-and-reel), so datasheet parameters such as gain range, noise figure, bandwidth, and supply requirements apply equally to both.
What package do the AD8331ARQZ and AD8331ARQZ-RL use?
Both parts are supplied in a 20-lead QSOP (Shrink Small Outline Package). The "RQ" in the part number designates the QSOP package, and the "Z" suffix indicates RoHS-compliant lead finish per Analog Devices part numbering conventions.
Can AD8331ARQZ and AD8331ARQZ-RL be used interchangeably in a design?
Yes, from an electrical and footprint standpoint they are interchangeable because they are the same device in the same package. The choice between them is driven by manufacturing requirements: AD8331ARQZ-RL tape-and-reel format is intended for high-volume automated pick-and-place assembly, while AD8331ARQZ tube packaging is typically used for prototyping or low-volume runs.
What is the function of the AD8331 in a signal chain?
The AD8331 is an ultralow noise variable gain amplifier (VGA) with a linear-in-dB gain control range of 48 dB, combined with a low noise preamplifier and an output amplifier. It is typically used in ultrasound and other imaging or instrumentation signal chains where low noise and wide dynamic range are required.
Does the packaging difference affect moisture sensitivity or handling requirements?
Moisture sensitivity level (MSL) and handling requirements are determined by the package and are the same for both part numbers since both use the identical 20-lead QSOP body. Tape-and-reel versus tube affects reflow logistics and feeder setup, not the device's MSL rating or bake requirements.
Which part number should be specified for automated production assembly?
AD8331ARQZ-RL should be specified for automated production because the "-RL" suffix denotes tape-and-reel packaging, which is compatible with standard pick-and-place feeders. AD8331ARQZ in tubes is better suited to manual handling, prototyping, or low-volume builds.