Part A
AD8620BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1672 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8625AR-REEL can serve as a functional replacement candidate for the AD8620BRZ in many designs, since both are dual JFET-input operational amplifiers sharing the same SOIC-8 footprint and wide supply range. However, the AD8625AR-REEL offers lower quiescent current and reduced bandwidth and slew rate, so verify AC performance, noise, and DC precision requirements before substituting in demanding signal-conditioning applications.
Amplifier Type
High match
Package Type
High match
Supply Voltage Range
Validation required
Gain Bandwidth Product
Not compatible
Parts at a glance
Part B
AD8625AR-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6055 Stückzahl
- Package
- SOIC-14
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8620BRZ | AD8625AR-REEL | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (dual) | 4 (quad) | Channel count determines whether the part can drop into a given PCB footprint and channel budget; a dual cannot directly replace a quad. |
| Input Offset Voltage (max) | 85 µV | 250 µV | Lower offset improves DC precision; a higher-offset part may degrade accuracy in precision signal chains. |
| Input Bias Current (typ) | 10 pA | 1 pA | Bias current affects error in high-impedance and photodiode circuits; both are JFET-input but differ in magnitude. |
| Gain Bandwidth Product | 25 MHz | 5 MHz | GBW sets achievable closed-loop bandwidth and settling; the AD8620 is significantly faster than the AD8625. |
| Slew Rate | 60 V/µs | 5 V/µs | Slew rate limits large-signal response and distortion at high frequencies; the AD8620 handles faster transients. |
| Supply Voltage Range | ±5 V to ±13 V | ±5 V to ±13 V (5 V to 26 V) | Operating supply range must match the system rails; both support similar bipolar supplies but differ in specified headroom details. |
| Input Voltage Noise Density | 6 nV/√Hz | 16 nV/√Hz | Lower noise density benefits low-level signal amplification; the AD8620 is quieter than the AD8625. |
| Package | 8-lead SOIC | 14-lead SOIC | Package and pinout must match the board layout; different footprints prevent direct substitution. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | Temperature range affects suitability for industrial or automotive environments; the AD8620 supports a wider range. |
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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 | AD8620BRZ | AD8625AR-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Amplifier Type | J-FET | J-FET |
| Number of Circuits | 2 | 4 |
| Output Type | - | Rail-to-Rail |
| Slew Rate | 60V/µs | 5V/µs |
| Gain Bandwidth Product | 25 MHz | 5 MHz |
| Current - Input Bias | 3 pA | 0.25 pA |
| Voltage - Input Offset | 45 µV | 350 µV |
| Supply Current | 3mA (x2 Channels) | 710µA (x4 Channels) |
| Current - Output / Channel | 45 mA | 15 mA |
| Voltage - Supply Span(Min) | 10 V | 5 V |
| Voltage - Supply Span(Max) | 26 V | 26 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD8620BRZ and AD8625AR-REEL?
The AD8620BRZ is a dual, low-noise, low-input-bias-current precision JFET operational amplifier supplied in an 8-lead SOIC package and specified over the extended industrial temperature range. The AD8625AR-REEL is a quad, low-power, rail-to-rail output JFET-input operational amplifier supplied in a 14-lead SOIC package on tape and reel. The primary differences are channel count (dual vs. quad), package/pin count (8-lead vs. 14-lead), and the associated board footprint and thermal characteristics.
Can the AD8620BRZ be used as a direct drop-in replacement for the AD8625AR-REEL?
No. The AD8620BRZ is a dual op amp in an 8-lead SOIC package, while the AD8625AR-REEL is a quad op amp in a 14-lead SOIC package. The pin counts, pin functions, and PCB land patterns differ, so a direct drop-in substitution is not possible without a board redesign and validation against the respective datasheets.
How do the input bias current specifications compare between the two devices?
Both devices are JFET-input operational amplifiers designed for low input bias current. The AD8620BRZ is specified with very low input bias current suitable for high-impedance sensor interfaces, and the AD8625AR-REEL is likewise specified for low input bias current. For exact maximum limits over temperature, consult the respective Analog Devices datasheets, as the guaranteed limits differ between the dual and quad versions.
What are the supply voltage and rail-to-rail characteristics of each part?
The AD8620BRZ operates from dual supplies and is specified for ±5 V to ±13 V operation, with output swing approaching the supply rails under defined load conditions. The AD8625AR-REEL is specified for single-supply operation from 5 V to 26 V (or dual ±2.5 V to ±13 V) with rail-to-rail output. Designers should verify the exact supply range and output swing limits in the manufacturer datasheets for the target operating conditions.
Which device is better suited for multichannel signal conditioning?
The AD8625AR-REEL, being a quad op amp, integrates four amplifiers in a single 14-lead SOIC package, which is advantageous for multichannel signal conditioning where board space and channel density matter. The AD8620BRZ provides two amplifiers and is preferable when only two channels are required or when the lower channel count simplifies layout and thermal management.
Are the AD8620BRZ and AD8625AR-REEL available in the same package type?
Both devices are offered in SOIC packages, but they are not the same package: the AD8620BRZ uses an 8-lead SOIC, while the AD8625AR-REEL uses a 14-lead SOIC. The "REEL" suffix on the AD8625AR-REEL indicates tape-and-reel packaging for automated assembly, whereas the AD8620BRZ suffix denotes the SOIC package and grade. Package dimensions and lead counts differ, so they are not interchangeable at the footprint level.
What noise performance should be expected from each amplifier?
The AD8620BRZ is characterized as a low-noise JFET-input op amp, with voltage noise density specified in its datasheet for precision, low-noise signal chains. The AD8625AR-REEL is a low-power JFET-input quad op amp whose noise performance is specified separately in its datasheet. Because the two parts target different power/noise trade-offs, designers should compare the datasheet noise density and current noise specifications at the intended source impedance before selecting between them.