Part A
AD629BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3376 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD629BRZ and AD629BR are functionally equivalent precision difference amplifiers sharing the same core specifications, pinout, and package. The AD629BRZ is the RoHS-compliant variant of the AD629BR, making it a suitable drop-in replacement in most applications where lead-free compliance is required, with no redesign of the surrounding circuitry needed.
Amplifier Function
High match
Package Type
High match
Pin Configuration
High match
RoHS Compliance
Validation required
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 | AD629BR | Why it matters |
|---|---|---|---|
| Amplifier Type | Difference Amplifier | Difference Amplifier | Confirms both parts serve the same core function, enabling direct substitution. |
| Number of Channels | 1 | 1 | Channel count must match for the replacement to fit the same circuit topology. |
| Gain | 1 V/V | 1 V/V | Fixed unity gain determines the signal scaling; identical gain ensures equivalent transfer function. |
| Input Offset Voltage (max) | 1 mV | 1 mV | Offset directly affects DC accuracy; matching values preserve measurement precision. |
| Input Bias Current (max) | 25 nA | 25 nA | Bias current impacts error in high-impedance sources; equal values keep error budgets unchanged. |
| Common-Mode Voltage Range | ±270 V | ±270 V | High common-mode range is the key feature for high-voltage sensing; identical range ensures equivalent protection. |
| Supply Voltage Range | ±2.5 V to ±18 V | ±2.5 V to ±18 V | Supply compatibility ensures the part operates in the same power rails without redesign. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ratings guarantee reliable operation in the same environment. |
| Package / Mounting | 8-Lead SOIC (Surface Mount) | 8-Lead SOIC (Surface Mount) | Package and mounting style must match for PCB footprint compatibility; the Z suffix denotes the RoHS-compliant SOIC variant. |
| RoHS Compliance | RoHS Compliant | Non-RoHS (legacy) | RoHS status affects regulatory compliance and solderability; the Z suffix indicates lead-free construction. |
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 | AD629BRZ | AD629BR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,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 | 100 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 is the difference between the AD629BRZ and the AD629BR?
The AD629BRZ and AD629BR are both AD629 high common-mode voltage difference amplifiers from Analog Devices. The primary difference is the package and ordering suffix: the AD629BRZ is supplied in a lead-free, RoHS-compliant 8-lead SOIC package (the "Z" suffix denotes lead-free/RoHS compliance), while the AD629BR is the older ordering code for the same 8-lead SOIC device without the lead-free designation. Both are specified with the same electrical performance grade (B grade).
Are the AD629BRZ and AD629BR electrically identical?
Yes. Both parts are the B-grade version of the AD629 difference amplifier and share the same datasheet specifications, including gain of 1, ±250 V common-mode voltage range, and the same gain error, offset, and CMRR limits for the B grade. The difference is limited to the package finish/ordering designation, not the silicon or electrical grade.
Can the AD629BRZ be used as a drop-in replacement for the AD629BR?
Yes, in most cases. Both are 8-lead SOIC devices with identical pinout and footprint, so the AD629BRZ can replace the AD629BR on an existing PCB. The substitution should still be validated against the design's assembly and compliance requirements, since the AD629BRZ is the lead-free/RoHS-compliant variant.
What is the common-mode voltage range of these devices?
The AD629 is specified for a common-mode voltage range of ±250 V, which allows it to interface with high-voltage signals while operating from standard supply rails. This specification applies to both the AD629BRZ and AD629BR, as they are the same B-grade device.
What package do the AD629BRZ and AD629BR use?
Both devices are offered in an 8-lead SOIC package. The AD629BRZ carries the lead-free (Z) designation and is RoHS-compliant, while the AD629BR is the non-lead-free ordering code. Package dimensions and pin assignments are the same for both.
What is the fixed gain of the AD629BRZ and AD629BR?
Both parts are fixed-gain difference amplifiers with a gain of 1 V/V. The gain is set internally, so no external gain-setting resistors are required for unity-gain difference amplification.
Which grade do the AD629BRZ and AD629BR correspond to?
Both are B-grade devices. The "B" in the ordering code indicates the higher-precision grade of the AD629, with tighter gain error, offset voltage, and CMRR specifications than the A grade, as documented in the Analog Devices AD629 datasheet.