Part A
AD8331ARQZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3550 PCS
- Package
- QSOP-20
- Series
- Amplificateur linéaire - spécial
Replacement verdict
Compatible functional replacement candidate
The AD8331ARQZ and AD8331ARQ-REEL7 are the same AD8331 ultralow noise VGA with programmable gain range, differing only in packaging format (tube vs. tape-and-reel). They are functionally interchangeable for design, prototyping, and production use, with the REEL7 variant suited to automated high-volume assembly.
Function and Core Specifications
High match
Package Type and Pinout
High match
Operating Temperature Range
High match
Packaging and Ordering Format
Validation required
Parts at a glance
Part B
AD8331ARQ-REEL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 9145 PCS
- Package
- SSOP-20
- Series
- Amplificateur linéaire - spécial
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 | AD8331ARQ-REEL7 | Why it matters |
|---|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | Same manufacturer ensures identical silicon design and process, critical for functional substitutability. |
| Function / Type | Ultrasound variable gain amplifier (VGA) with LNA and VGA | Ultrasound variable gain amplifier (VGA) with LNA and VGA | Identical device function confirms the parts are the same IC and directly interchangeable in the target application. |
| Package / Case | 20-Lead QSOP | 20-Lead QSOP | Matching package and footprint allows drop-in replacement on the same PCB without layout changes. |
| Supply Voltage Range | 4.5 V to 5.5 V (single supply) | 4.5 V to 5.5 V (single supply) | Same supply range ensures the part operates correctly in the existing power rail design. |
| Bandwidth | 120 MHz (LNA/VGA -3 dB bandwidth) | 120 MHz (LNA/VGA -3 dB bandwidth) | Identical bandwidth guarantees the same signal fidelity and frequency response in the application. |
| Gain Range | -4.5 dB to +43.5 dB (VGA gain range) | -4.5 dB to +43.5 dB (VGA gain range) | Same gain range preserves the dynamic range and signal scaling behavior of the circuit. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ratings ensure equivalent reliability across the intended operating environment. |
| Packaging / Ordering Format | Tube / individual (Z = RoHS-compliant) | Tape and reel (7-inch reel) | Different packaging affects assembly line handling and inventory format, though the IC itself is functionally identical. |
| RoHS Compliance | RoHS compliant (Z suffix) | Non-RoHS (legacy part number) | RoHS status affects regulatory compliance and solder process compatibility for the final product. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8331ARQZ | AD8331ARQ-REEL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Series | X-AMP® | X-AMP® |
| Part Status | Active | Obsolete |
| 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 AD8331ARQ-REEL7?
Both parts are the same AD8331 ultralow noise VGA with LNA and programmable gain, offered in a 20-lead QSOP package. The AD8331ARQZ is the standard tube/tray ordering option, while AD8331ARQ-REEL7 is the same device supplied on a 7-inch tape-and-reel for automated assembly. The electrical specifications are identical; the difference is packaging and order quantity.
Are AD8331ARQZ and AD8331ARQ-REEL7 electrically and functionally interchangeable?
Yes. Both order codes refer to the same AD8331 die and 20-lead QSOP package, so they are electrically and functionally interchangeable. The suffix difference only indicates the shipping format (tray vs. 7-inch reel).
What are the key specifications of the AD8331?
The AD8331 is a single-channel ultralow noise variable gain amplifier (VGA) with a low noise preamplifier (LNA) and a programmable gain range of 0 dB to 48 dB. It operates from a single 5 V supply, provides a -3 dB bandwidth of approximately 120 MHz, and is housed in a 20-lead QSOP package. It is intended for ultrasound and other high-dynamic-range signal-chain applications.
Which package do AD8331ARQZ and AD8331ARQ-REEL7 use?
Both parts use the 20-lead QSOP (RQ) package. The "RQ" in the order code denotes the QSOP package, and the "Z" suffix indicates RoHS-compliant lead-free construction.
Are both AD8331ARQZ and AD8331ARQ-REEL7 RoHS compliant?
Yes. The "Z" suffix in both order codes denotes RoHS-compliant, lead-free construction per Analog Devices ordering conventions.
Which part should be selected for high-volume automated PCB assembly?
AD8331ARQ-REEL7 is the appropriate choice for high-volume automated assembly because it is supplied on a 7-inch tape-and-reel, which is compatible with standard pick-and-place equipment. AD8331ARQZ is supplied in tray/tube format and is better suited to prototyping or low-volume runs.
Can AD8331ARQZ and AD8331ARQ-REEL7 be used interchangeably in an existing design?
Yes, from an electrical and footprint standpoint they are the same device in the same 20-lead QSOP package, so either order code can populate the same PCB land pattern. Selection between them is based on manufacturing format and inventory handling rather than design differences.