Part A
AD629ARZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6804 個数
- Package
- SOIC-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Replacement verdict
Compatible functional replacement candidate
The AD629BR-REEL is a functionally compatible replacement candidate for the AD629ARZ, sharing the same high common-mode voltage difference amplifier architecture, pinout, and package. The BR grade offers tighter gain and offset specifications, making it suitable for higher-accuracy applications, while both parts remain interchangeable in most designs with appropriate tolerance review.
Package Type
High match
Pin Configuration
High match
Gain Error
Validation required
Input Offset Voltage
Validation required
Parts at a glance
Part B
AD629BR-REEL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4495 個数
- Package
- SOIC-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
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 | AD629BR-REEL | Why it matters |
|---|---|---|---|
| Input Common-Mode Voltage Range | ±270 V | ±270 V | Defines the maximum common-mode voltage the difference amplifier can tolerate; both parts share the same high-voltage capability. |
| Gain Error (Grade) | 0.05% max (A grade) | 0.02% max (B grade) | Gain accuracy directly affects measurement precision; the B grade offers tighter gain error for higher-accuracy applications. |
| Offset Voltage (RTI) | 1 mV max (A grade) | 0.5 mV max (B grade) | Lower input offset voltage improves DC accuracy; the B grade provides better offset performance. |
| Offset Voltage Drift | 20 µV/°C max (A grade) | 10 µV/°C max (B grade) | Drift determines stability over temperature; the B grade is more stable across temperature variations. |
| CMRR (Common-Mode Rejection Ratio) | 77 dB min (A grade) | 86 dB min (B grade) | Higher CMRR rejects common-mode noise more effectively; the B grade offers superior rejection for noisy environments. |
| Gain (Fixed) | 1 V/V | 1 V/V | Both are unity-gain difference amplifiers, so the signal scaling is identical and functionally interchangeable in this respect. |
| Supply Voltage Range | ±2.5 V to ±18 V | ±2.5 V to ±18 V | Both support the same dual-supply range, allowing use in a wide variety of system power architectures. |
| Operating Temperature Range | −40°C to +85°C | −40°C to +85°C | Identical industrial temperature range ensures both parts suit the same environmental conditions. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount, reel) | Same package footprint allows drop-in substitution; the B grade is supplied on tape-and-reel for automated assembly. |
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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 | AD629ARZ | AD629BR-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| 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 primary differences between the AD629ARZ and AD629BR-REEL?
Both devices are AD629 high common-mode voltage difference amplifiers from Analog Devices. The AD629ARZ is supplied in a 8-lead SOIC package in tube form, while the AD629BR-REEL is the B-grade version supplied in a 8-lead SOIC package on a 13-inch reel for automated assembly. The B grade offers tighter gain error and offset voltage specifications than the A grade.
Are the AD629ARZ and AD629BR-REEL functionally interchangeable in an existing design?
Yes, both are pin-compatible AD629 difference amplifiers in the same 8-lead SOIC package and share the same functional block diagram and supply requirements. However, because the B grade has tighter gain and offset specifications, substituting an A-grade device for a B-grade device may degrade system accuracy, so the design tolerance must be validated against the datasheet limits.
What is the gain error specification for the AD629ARZ versus the AD629BR-REEL?
Per the Analog Devices AD629 datasheet, the A grade (AD629ARZ) has a maximum gain error of 0.05%, while the B grade (AD629BR-REEL) has a maximum gain error of 0.02%. Both are specified as unity-gain difference amplifiers with a fixed gain of 1.
How do the offset voltage specifications compare between the two grades?
The AD629ARZ (A grade) has a maximum input offset voltage of 1 mV, whereas the AD629BR-REEL (B grade) has a maximum input offset voltage of 0.5 mV, according to the AD629 datasheet. The B grade therefore provides better DC accuracy for precision measurement applications.
What common-mode voltage range do the AD629ARZ and AD629BR-REEL support?
Both devices support a common-mode voltage range of ±270 V with ±15 V supplies, as specified in the AD629 datasheet. This wide range is achieved through a resistor network that attenuates the common-mode signal while preserving the differential signal.
What are the supply voltage requirements for the AD629ARZ and AD629BR-REEL?
Both devices operate from dual supplies of ±2.5 V to ±18 V, with ±15 V being the typical operating condition for the specified common-mode range and performance parameters. They are specified for operation over the industrial temperature range of −40°C to +85°C.
Why would a designer choose the AD629BR-REEL over the AD629ARZ?
The AD629BR-REEL offers tighter gain error (0.02% vs 0.05%) and lower maximum offset voltage (0.5 mV vs 1 mV) than the AD629ARZ, making it preferable for precision applications where DC accuracy is critical. The reel packaging also supports high-volume automated pick-and-place assembly.
Do the AD629ARZ and AD629BR-REEL differ in package or pinout?
No. Both are offered in the same 8-lead SOIC package with identical pinout and footprint. The only differences are the grade-level performance specifications and the packaging format (tube for AD629ARZ, 13-inch reel for AD629BR-REEL).