Part A
ADA4625-2ARDZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1435 PCS
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The ADA4625-2ARDZ is a viable functional replacement candidate for the ADA4622-2ARZ in many precision signal-chain applications, as both share the same dual op-amp configuration, SOIC-8 footprint, and wide supply range. However, the ADA4625-2ARDZ offers substantially higher gain bandwidth and slew rate, so designs should be validated for stability, noise performance, and power budget before substitution.
Package Type
High match
Channel Count
High match
Supply Voltage Range
Validation required
Gain Bandwidth Product
Validation required
Parts at a glance
Part B
ADA4622-2ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7137 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADA4622-2ARZ | ADA4625-2ARDZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 2 | Both are dual op-amps, so channel count is matched for direct substitution in dual-channel circuits. |
| Gain Bandwidth Product (GBP) | 8 MHz | 18 MHz | Higher GBP allows the ADA4625-2ARDZ to handle wider-bandwidth signals and faster closed-loop response. |
| Input Offset Voltage (Max) | ±0.35 mV | ±0.1 mV | Lower offset voltage improves DC precision, making the ADA4625-2ARDZ preferable for high-accuracy sensor front ends. |
| Input Voltage Noise Density | 12 nV/√Hz | 3.3 nV/√Hz | Lower noise density benefits low-level signal amplification; the ADA4625-2ARDZ offers significantly better noise performance. |
| Supply Voltage Range | 5 V to 30 V (±2.5 V to ±15 V) | 5 V to 36 V (±2.5 V to ±18 V) | The wider supply range of the ADA4625-2ARDZ allows operation at higher rail voltages for larger signal swings. |
| Quiescent Current per Amplifier | 1.1 mA | 4.5 mA | Lower quiescent current in the ADA4622-2ARZ suits power-sensitive designs, while the ADA4625-2ARDZ trades power for speed and noise. |
| Slew Rate | 23 V/µs | 48 V/µs | Higher slew rate enables faster large-signal response, relevant for driving capacitive loads and fast transients. |
| Input Bias Current (Typical) | 1 pA | 15 pA | Both are JFET-input with very low bias current; the ADA4622-2ARZ is slightly better for ultra-high-impedance sources. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical industrial temperature range means both are suitable for the same environmental conditions. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package and pinout allow drop-in board replacement without layout changes. |
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 | ADA4625-2ARDZ | ADA4622-2ARZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | J-FET | J-FET |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 48V/µs | 23V/µs |
| Gain Bandwidth Product | 18 MHz | 8 MHz |
| -3 dB Bandwidth | 16 MHz | 15.5 MHz |
| Current - Input Bias | 7 nA | 2 pA |
| Voltage - Input Offset | 100 µV | 40 µV |
| Supply Current | 4mA (x2 Channels) | 665µA (x2 Channels) |
| Current - Output / Channel | 33 mA | 20 mA |
| Voltage - Supply Span(Min) | 5 V | 5 V |
| Voltage - Supply Span(Max) | 36 V | 30 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the ADA4622-2ARZ and the ADA4625-2ARDZ?
The ADA4622-2ARZ is a dual, low-bias-current, rail-to-rail output JFET-input operational amplifier supplied in an 8-lead SOIC package. The ADA4625-2ARDZ is a dual, low-noise, low-distortion JFET-input op amp supplied in an 8-lead SOIC package with an exposed pad. The ADA4625-2 is optimized for lower voltage noise and lower total harmonic distortion, while the ADA4622-2 emphasizes very low input bias current and wide supply range operation.
Are the ADA4622-2ARZ and ADA4625-2ARDZ pin-compatible?
Both devices use the standard 8-lead SOIC dual-op-amp pinout (1 OUT A, 2 -IN A, 3 +IN A, 4 V-, 5 +IN B, 6 -IN B, 7 OUT B, 8 V+). However, the ADA4625-2ARDZ includes an exposed thermal pad on the package underside, so the PCB land pattern must accommodate that pad. Pin functions are equivalent, but the footprint is not identical.
How do the input bias currents of the ADA4622-2 and ADA4625-2 compare?
The ADA4622-2 is specified with extremely low input bias current, typically in the low picoampere range at room temperature, making it well suited to high-impedance sensor interfaces. The ADA4625-2 also uses a JFET input stage with low bias current, but its datasheet prioritizes noise and distortion performance rather than the ultra-low bias current of the ADA4622-2. Designers should confirm the exact bias-current limits in each manufacturer datasheet for the intended operating temperature.
Which device is better for low-noise audio or precision signal-chain applications?
The ADA4625-2ARDZ is specified for lower voltage noise density and lower harmonic distortion than the ADA4622-2ARZ, so it is generally the preferred choice for low-noise, low-distortion signal chains. The ADA4622-2ARZ is better suited to applications where ultra-low input bias current and wide supply range are the dominant requirements.
Do the ADA4622-2ARZ and ADA4625-2ARDZ support the same supply voltage range?
Both are JFET-input op amps intended for dual-supply and single-supply operation, but their specified supply ranges differ. The ADA4622-2 is specified for operation from approximately ±5 V to ±15 V (or 10 V to 30 V single supply), while the ADA4625-2 is specified over a narrower supply range. The exact minimum and maximum supply voltages should be verified in the respective manufacturer datasheets before substitution.
Can the ADA4625-2ARDZ be used as a drop-in replacement for the ADA4622-2ARZ?
Not as a true drop-in replacement. Although the pin functions match the standard 8-lead SOIC dual-op-amp pinout, the ADA4625-2ARDZ has an exposed thermal pad that requires a modified PCB land pattern. In addition, supply range, noise, bias current, and distortion specifications differ, so the replacement must be validated against the target design requirements and manufacturer documentation.
What package and thermal considerations apply to the ADA4625-2ARDZ?
The ADA4625-2ARDZ is supplied in an 8-lead SOIC package with an exposed pad (EPAD) on the underside. The exposed pad is intended to improve thermal performance and should be soldered to a corresponding copper land on the PCB, typically connected to a suitable potential as specified in the datasheet. The ADA4622-2ARZ uses a standard 8-lead SOIC package without an exposed pad.