Part A
AD629BRZ-R7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7417 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD629BRZ-R7 and AD629AR are functionally compatible difference amplifiers sharing the same core topology, gain configuration, and SOIC-8 footprint, making the BRZ-R7 a viable replacement candidate for the AR grade in most applications. The primary distinction lies in grade-level precision: the BRZ-R7 offers tighter gain error, lower offset voltage, and reduced offset drift, while both parts share comparable supply range and input common-mode capability. Designers should validate application-specific error budgets where the AR grade's wider tolerances were originally assumed, but no redesign of the surrounding circuit is required.
Package and Pinout
High match
Gain and Topology
High match
Supply Voltage Range
High match
Grade-Level Precision
Validation required
Parts at a glance
Part B
AD629AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2251 PCS
- Series
- Linear - Amplifiers - Instrumentation, 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 | AD629BRZ-R7 | AD629AR | Why it matters |
|---|---|---|---|
| Grade / Temperature Range | B grade, -40°C to +85°C | A grade, -40°C to +85°C | The B grade is a higher-precision grade than the A grade; this affects offset, gain error, and CMRR specifications, which are critical for measurement accuracy. |
| Input Offset Voltage (max) | 1 mV | 2 mV | Lower offset voltage reduces DC measurement error, which is important for precision current-sensing and difference-amplifier applications. |
| Input Offset Voltage Drift (max) | 10 µV/°C | 20 µV/°C | Lower drift maintains accuracy over temperature; the B grade offers better stability for precision systems. |
| Gain Error (max) | 0.02% | 0.05% | Gain error directly affects the accuracy of the amplified differential signal; the B grade provides tighter gain accuracy. |
| CMRR (min) | 86 dB | 77 dB | Higher common-mode rejection improves the ability to extract a small differential signal in the presence of large common-mode voltages. |
| Nonlinearity (max) | 0.001% | 0.002% | Better linearity ensures the output remains proportional to the input across the full range, improving measurement fidelity. |
| Package / Mounting | 8-SOIC, surface mount, tape and reel | 8-SOIC, surface mount, tube | Packaging form (reel vs tube) affects assembly line handling and inventory; both share the same SOIC footprint for board compatibility. |
| Supply Voltage Range | ±2.5 V to ±18 V (dual) | ±2.5 V to ±18 V (dual) | Identical supply range means both parts are interchangeable in the same power architecture. |
| Number of Amplifiers / Function | 1 difference amplifier | 1 difference amplifier | Same functional block and channel count ensures direct functional substitutability in the circuit. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD629BRZ-R7 | AD629AR |
|---|---|---|
| Part Status | Active | Obsolete |
| Amplifier Type | Differential | Current Sense |
| Number of Circuits | 1 | 1 |
| Slew Rate | 2.1V/µs | 2.1V/µs |
| Voltage - Input Offset | 100 µV | 200 µV |
| Supply Current | 900µA | 900µA |
| Current - Output / Channel | 25 mA | 25 mA |
| Voltage - Supply Span (Min) | - | 5 V |
| Voltage - Supply Span (Max) | - | 36 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | - | AD629 |
| -3 dB Bandwidth | 500 kHz | 500 kHz |
| Voltage - Supply Span(Min) | 5 V | - |
| Voltage - Supply Span(Max) | 36 V | - |
Frequently asked questions
What are the key differences between the AD629BRZ-R7 and the AD629AR?
Both are AD629 high common-mode voltage difference amplifiers from Analog Devices. The AD629AR is specified over the industrial temperature range (−40°C to +85°C) with a B-grade gain error and offset specification, while the AD629BRZ-R7 is the B-grade version in a RoHS-compliant SOIC package supplied in 7-inch reel packaging (R7). The core amplifier topology and ±250 V common-mode voltage capability are the same; the suffix differences relate to grade, package/lead finish, and packaging format.
Are the AD629BRZ-R7 and AD629AR electrically interchangeable in an existing design?
Functionally they share the same AD629 architecture and pinout in the 8-lead SOIC package, so they can often be interchanged. However, the AD629BRZ-R7 is the B-grade with tighter gain and offset specifications, while the AD629AR is the A-grade. Substitution should be validated against the datasheet limits for gain error, offset voltage, and temperature drift in the target application.
What common-mode voltage range do both parts support?
Both the AD629BRZ-R7 and AD629AR are designed to handle common-mode voltages up to ±250 V while operating from ±15 V supplies, making them suitable for high-voltage current sensing and industrial measurement applications.
What package and mounting type do these devices use?
Both the AD629BRZ-R7 and AD629AR are offered in an 8-lead SOIC surface-mount package. The AD629BRZ-R7 is supplied in a 7-inch tape-and-reel format (R7 suffix) with RoHS-compliant lead finish, while the AD629AR is the standard tube or bulk ordering option.
What is the difference in gain error specification between the two grades?
The AD629B grade (AD629BRZ-R7) offers a tighter maximum gain error than the AD629A grade (AD629AR). Designers should consult the official Analog Devices AD629 datasheet for the exact gain error limits applicable to each grade before finalizing a design.
What supply voltage do the AD629BRZ-R7 and AD629AR require?
Both devices operate from dual supplies, typically ±15 V, and are specified for operation over the industrial temperature range. The supply configuration is identical between the two grades.
Which part should be selected for a new design requiring RoHS compliance and reel packaging?
The AD629BRZ-R7 is the appropriate choice when RoHS-compliant lead finish and 7-inch reel packaging are required for automated surface-mount assembly. The AD629AR remains suitable where the A-grade specifications and standard packaging are acceptable.