Part A
AD8620BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1672 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8625AR is a viable functional replacement candidate for the AD8620BRZ in many precision amplifier applications, though careful validation is required for supply voltage headroom, package footprint, and thermal considerations before committing to a design change.
Amplifier Type
High match
Supply Voltage Range
Validation required
Package Type
Validation required
Input Offset Voltage
High match
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 | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (Dual) | 4 (Quad) | Channel count determines whether the part can drop into a given PCB footprint and circuit topology; a dual cannot directly replace a quad. |
| Input Offset Voltage (max) | 85 µV | 750 µV | Lower offset improves DC precision; the AD8620BRZ is a much tighter-grade part, so substitution affects accuracy in precision signal chains. |
| Input Bias Current (typ) | 10 pA | 1 pA | Bias current affects error in high-impedance and photodiode/electrometer circuits; both are JFET-input but differ in typical leakage. |
| Gain Bandwidth Product | 25 MHz | 5 MHz | GBW sets the achievable closed-loop bandwidth and settling; the AD8620BRZ supports much faster signal processing than the AD8625AR. |
| Slew Rate | 60 V/µs | 5 V/µs | Slew rate limits large-signal response and distortion at high frequency; the faster AD8620BRZ suits wider-bandwidth, higher-drive applications. |
| Supply Voltage Range | ±5 V to ±13 V (dual supply) | ±5 V to ±13 V (dual supply) | Both operate over the same dual-supply range, so power-rail compatibility is maintained between the two parts. |
| Input Voltage Noise Density | 6 nV/√Hz (typ) | 16 nV/√Hz (typ) | Lower noise density improves SNR in low-level signal amplification; the AD8620BRZ is significantly quieter than the AD8625AR. |
| Package | 8-lead SOIC | 14-lead SOIC | Package and pin count must match the board layout; the quad AD8625AR requires a larger footprint than the dual AD8620BRZ. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | The wider temperature rating of the AD8620BRZ allows use in harsher environments where the AD8625AR may not be specified. |
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 | AD8620BRZ | AD8625AR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| 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?
The AD8620BRZ is a dual, low-noise, precision JFET-input operational amplifier specified for ±5 V to ±13 V supplies, offered in an 8-lead SOIC package and rated for the extended industrial temperature range. The AD8625AR is a quad, rail-to-rail output, low-power JFET-input op amp specified for +5 V to +26 V (or ±2.5 V to ±13 V) supplies, offered in a 14-lead SOIC package and rated for the industrial temperature range. The primary differences are channel count (dual vs. quad), package footprint, and the AD8625's rail-to-rail output swing.
Can the AD8620BRZ be used as a direct drop-in replacement for the AD8625AR?
No. The AD8620BRZ is a dual op amp in an 8-lead SOIC package, while the AD8625AR 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 manufacturer datasheets.
How do the supply voltage ranges of the AD8620BRZ and AD8625AR compare?
The AD8620BRZ is specified for operation on ±5 V to ±13 V dual supplies. The AD8625AR is specified for operation on +5 V to +26 V single supplies or ±2.5 V to ±13 V dual supplies. The AD8625AR therefore supports lower single-supply operation, while both devices share overlapping dual-supply ranges.
Do the AD8620BRZ and AD8625AR have rail-to-rail outputs?
The AD8625AR features a rail-to-rail output stage, allowing the output swing to approach the supply rails. The AD8620BRZ does not have a rail-to-rail output; its output swing is specified relative to the supply rails per the manufacturer datasheet. This difference matters when maximizing dynamic range on low supply voltages.
How do the noise characteristics of the AD8620BRZ and AD8625AR differ?
The AD8620BRZ is characterized as a low-noise JFET-input amplifier, with voltage noise density specified in its datasheet for precision, low-noise signal conditioning. The AD8625AR is a low-power JFET-input amplifier whose noise performance is specified in its own datasheet. Designers should compare the datasheet voltage noise density and current noise specifications for the target source impedance before selecting between them.
What are the package and channel-count differences between the AD8620BRZ and AD8625AR?
The AD8620BRZ is a dual operational amplifier supplied in an 8-lead SOIC package. The AD8625AR is a quad operational amplifier supplied in a 14-lead SOIC package. The channel count and package footprint differ, which affects board layout, channel density, and thermal considerations.
Are the AD8620BRZ and AD8625AR specified for the same temperature range?
The AD8620BRZ is specified for the extended industrial temperature range per its datasheet. The AD8625AR is specified for the industrial temperature range per its datasheet. The exact temperature limits should be confirmed from the respective manufacturer datasheets, as the two grades are not identical.
Which device is better suited for low-power, multi-channel designs?
The AD8625AR is generally better suited for low-power, multi-channel designs because it integrates four JFET-input amplifiers in a single 14-lead SOIC package with rail-to-rail outputs and low supply current per amplifier. The AD8620BRZ, being a dual amplifier, is better suited to precision low-noise two-channel signal chains where its lower noise and extended temperature grade are advantageous.