Part A
AD629ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6804 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD629BRZ-RL is a functionally compatible replacement candidate for the AD629ARZ, sharing the same amplifier architecture, pinout, and supply requirements, with the BRZ grade offering tighter gain and offset specifications. Designers should confirm the tighter grade tolerances and reel packaging format against their application and assembly requirements before substituting.
Amplifier Function and Topology
High match
Package and Pinout
High match
Supply Voltage Range
High match
Grade and Accuracy Specifications
Validation required
Parts at a glance
Part B
AD629BRZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3096 Stückzahl
- Package
- SOIC-8
- 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 | AD629ARZ | AD629BRZ-RL | Why it matters |
|---|---|---|---|
| Input Offset Voltage (max) | 1 mV | 0.5 mV | Lower offset voltage improves DC accuracy; the B grade offers tighter offset for precision measurement applications. |
| Input Offset Voltage Drift (max) | 20 µV/°C | 10 µV/°C | Lower drift maintains accuracy over temperature; the B grade is preferable for wide-temperature precision systems. |
| Gain Error (max) | 0.05% | 0.02% | Gain error directly affects signal scaling accuracy; the B grade provides tighter gain accuracy for critical measurements. |
| Common-Mode Rejection Ratio (min) | 77 dB | 86 dB | Higher CMRR rejects common-mode noise; the B grade is better suited for high common-mode voltage environments. |
| Input Voltage Noise (typ) | 15 µV p-p | 12 µV p-p | Lower noise improves resolution in low-level signal applications; the B grade offers slightly better noise performance. |
| Number of Amplifiers | 1 | 1 | Both are single-channel difference amplifiers, so channel count is identical for circuit design purposes. |
| Supply Voltage Range | ±2.5 V to ±18 V | ±2.5 V to ±18 V | Identical supply range means both parts are interchangeable across the same power supply designs. |
| Package / Mounting | 8-Lead SOIC (Surface Mount) | 8-Lead SOIC (Surface Mount) | Same package and footprint allows direct board-level substitution without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure both parts meet the same environmental requirements. |
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 | AD629ARZ | AD629BRZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Amplifier Type | Differential | Differential |
| Number of Circuits | 1 | 1 |
| Slew Rate | 2.1V/µs | 2.1V/µs |
| -3 dB Bandwidth | 500 kHz | 500 kHz |
| Voltage - Input Offset | 200 µV | 100 µV |
| Supply Current | 900µA | 900µA |
| Current - Output / Channel | 25 mA | 25 mA |
| Voltage - Supply Span(Min) | 5 V | 5 V |
| Voltage - Supply Span(Max) | 36 V | 36 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the main differences between the AD629ARZ and AD629BRZ-RL?
Both are AD629 high common-mode voltage difference amplifiers from Analog Devices in an 8-lead SOIC package. The AD629ARZ is a tube/rail variant with a specified gain error grade of 0.1% maximum, while the AD629BRZ-RL is a tape-and-reel variant with a tighter 0.05% maximum gain error grade. The B grade also offers tighter offset voltage and CMRR specifications than the A grade.
Are the AD629ARZ and AD629BRZ-RL pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions, so they are pin-compatible and share the same PCB land pattern.
Can the AD629BRZ-RL be used as a drop-in replacement for the AD629ARZ?
Yes, in most designs. The two parts share the same pinout, package, supply range, and functional architecture, and the B grade meets or exceeds the A grade's gain error, offset voltage, and CMRR specifications. The primary practical difference is the tighter performance grading and the tape-and-reel packaging of the BRZ-RL.
What is the difference in gain error between the two grades?
The AD629ARZ (A grade) is specified with a maximum gain error of 0.1%, while the AD629BRZ-RL (B grade) is specified with a maximum gain error of 0.05%. Both have a nominal gain of 1 V/V.
Do the AD629ARZ and AD629BRZ-RL have the same supply voltage requirements?
Yes. Both devices operate from dual supplies of ±2.5 V to ±18 V (or a total supply of 5 V to 36 V) and are specified for the extended industrial temperature range of −40°C to +85°C.
What is the difference between the ARZ and BRZ-RL ordering suffixes?
The "ARZ" suffix denotes the A grade in an 8-lead SOIC package supplied in tubes, while "BRZ-RL" denotes the B grade in the same SOIC package supplied in tape-and-reel format (RL). The Z indicates RoHS-compliant lead finish for both.
Which part should be selected for a design requiring tighter DC accuracy?
The AD629BRZ-RL should be selected when tighter DC accuracy is required, since its B grade provides lower maximum gain error (0.05% vs 0.1%), lower input offset voltage, and higher minimum CMRR than the AD629ARZ A grade.