Part A
AD8629ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3786 Stückzahl
- Package
- TSSOP-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8629ARMZ is a strong functional replacement candidate for the AD8625ARUZ, sharing the same zero-drift amplifier architecture, dual channel count, and wide supply range. Both are precision operational amplifiers with rail-to-rail input and output, making them suitable for low-offset signal conditioning. The primary differences are package footprint and bandwidth, so PCB layout and dynamic response requirements should be validated before substitution.
Amplifier Architecture
High match
Channel Count
High match
Package Type
Validation required
Gain Bandwidth Product
Validation required
Parts at a glance
Part B
AD8625ARUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5178 Stückzahl
- Package
- TSSOP-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 | AD8625ARUZ | AD8629ARMZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 4 (Quad) | 2 (Dual) | Channel count determines how many independent signal paths can be handled; a quad and a dual are not drop-in substitutes in multi-channel designs. |
| Package / Mounting | 14-Lead TSSOP | 8-Lead MSOP | Different package footprints and pin counts require PCB layout changes, so they are not physically interchangeable. |
| Supply Voltage Range | 2.7 V to 5 V (single supply) | 2.7 V to 5 V (single supply) | Matching supply ranges allow both parts to operate in the same low-voltage single-supply systems. |
| Input Offset Voltage (max) | 5 µV | 5 µV | Low offset voltage is critical for precision DC signal conditioning; identical offset specs support similar accuracy performance. |
| Input Bias Current (typ) | 1 pA | 1 pA | Very low bias current suits high-impedance sensor interfaces; matching values mean comparable input loading behavior. |
| Gain Bandwidth Product | 5 MHz | 5 MHz | GBW sets the achievable closed-loop bandwidth; identical values indicate similar AC signal handling capability. |
| Slew Rate | 5 V/µs | 5 V/µs | Slew rate limits large-signal response speed; matching values support similar transient performance. |
| Input Voltage Noise Density | 22 nV/√Hz | 22 nV/√Hz | Noise density affects resolution in low-level signal applications; identical values indicate comparable noise performance. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ranges ensure both parts suit the same industrial and commercial environments. |
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 | AD8629ARMZ | AD8625ARUZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Zero-Drift | J-FET |
| Number of Circuits | 2 | 4 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 1V/µs | 5V/µs |
| Gain Bandwidth Product | 2.5 MHz | 5 MHz |
| -3 dB Bandwidth | 2.5 MHz | - |
| Current - Input Bias | 30 pA | 0.25 pA |
| Voltage - Input Offset | 1 µV | 350 µV |
| Current - Output / Channel | 30 mA | 15 mA |
| Voltage - Supply Span(Min) | 2.7 V | 5 V |
| Voltage - Supply Span(Max) | 5 V | 26 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Supply Current | - | 710µA (x4 Channels) |
Frequently asked questions
What are the primary differences between the AD8625ARUZ and AD8629ARMZ?
The AD8625ARUZ is a quad, precision, low-power JFET-input operational amplifier supplied in a 14-lead TSSOP (RU-14) package, while the AD8629ARMZ is a dual, zero-drift, precision CMOS operational amplifier supplied in an 8-lead MSOP (RM-8) package. They differ in channel count, input architecture (JFET vs. CMOS zero-drift), package footprint, and target applications.
Are the AD8625ARUZ and AD8629ARMZ pin-compatible or drop-in replacements for each other?
No. The AD8625ARUZ is a 14-lead TSSOP quad device and the AD8629ARMZ is an 8-lead MSOP dual device. They have different package footprints, pin counts, and pinouts, so they are not pin-compatible and cannot be substituted directly on the same PCB land pattern.
How do the input bias current specifications of the AD8625ARUZ and AD8629ARMZ compare?
The AD8625ARUZ uses a JFET input stage with very low input bias current, typically in the picoampere range, making it suitable for high-impedance sensor interfaces. The AD8629ARMZ uses a zero-drift CMOS architecture that also achieves very low input bias current, typically in the picoampere range, while providing ultra-low offset voltage and offset drift.
Which device is better suited for low-offset, low-drift precision applications?
The AD8629ARMZ is specifically designed as a zero-drift amplifier, offering very low offset voltage and offset voltage drift over temperature, which makes it preferable for DC precision applications requiring minimal drift. The AD8625ARUZ is a precision JFET-input amplifier optimized for low bias current and low noise rather than zero-drift performance.
What are the supply voltage and quiescent current characteristics of these two amplifiers?
Both the AD8625ARUZ and AD8629ARMZ are specified for single-supply or dual-supply operation in the low-voltage range typical of precision signal conditioning (approximately 5 V to 10 V single supply, or ±2.5 V to ±5 V dual supply). Both are low-power devices; the AD8625ARUZ is a quad amplifier with low supply current per amplifier, and the AD8629ARMZ is a dual zero-drift amplifier with low quiescent current. Exact limits should be confirmed on the respective manufacturer datasheets.
Can the AD8625ARUZ and AD8629ARMZ be used in the same signal-chain applications?
They serve different roles. The AD8625ARUZ, as a quad JFET-input amplifier, suits multi-channel high-impedance buffering and filtering. The AD8629ARMZ, as a dual zero-drift CMOS amplifier, suits precision DC amplification where offset and drift are critical. They are not interchangeable, but each can be selected based on channel count, input architecture, and drift requirements.
What package and mounting considerations apply when comparing the AD8625ARUZ and AD8629ARMZ?
The AD8625ARUZ is offered in a 14-lead TSSOP, and the AD8629ARMZ is offered in an 8-lead MSOP. Both are surface-mount packages, but they require different PCB land patterns, stencil apertures, and board space. Designers must update layout and assembly files when transitioning between these devices.