Part A
AD8676BRZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 1652 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 AD8676BRZ and AD8672AR are both dual precision operational amplifiers from Analog Devices, sharing a common SOIC-8 footprint and similar supply voltage ranges, making the AD8676BRZ a viable functional replacement candidate for the AD8672AR in many precision signal-conditioning applications. However, designers should validate noise performance, input bias current, and bandwidth requirements against the target circuit before committing to a substitution.
Amplifier Channel Count
High match
Package Type
High match
Input Bias Current
Validation required
Gain Bandwidth Product
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 | AD8676BRZ | AD8672AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 2 | Both are dual op-amps, so channel count matches for drop-in substitution in dual-channel circuits. |
| Input Offset Voltage (max) | 12 µV | 75 µV | Lower offset improves DC precision; AD8676 is significantly more precise, which matters for high-accuracy signal chains. |
| Input Voltage Noise Density | 2.8 nV/√Hz | 8 nV/√Hz | Lower noise density benefits low-level signal amplification; AD8676 offers roughly 3x lower noise. |
| Gain Bandwidth Product | 10 MHz | 10 MHz | Matching bandwidth means similar AC performance and closed-loop stability for the same feedback network. |
| Slew Rate | 2.5 V/µs | 5 V/µs | Higher slew rate in AD8672 supports faster large-signal response; affects settling and distortion at high frequencies. |
| Supply Voltage Range | ±5 V to ±15 V (10 V to 30 V) | ±5 V to ±15 V (10 V to 30 V) | Identical supply range allows the parts to operate in the same power rails without redesign. |
| Supply Current per Amplifier (typ) | 2.7 mA | 3.0 mA | Similar quiescent current means comparable power budget and thermal behavior in the application. |
| Input Bias Current (typ) | 2 nA | 10 nA | Lower bias current reduces errors in high-impedance circuits; AD8676 is preferable for precision sensor interfaces. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | Wider temperature range of AD8676 supports harsher environments; AD8672 is limited to standard industrial range. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package footprint enables direct board-level replacement without layout changes. |
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 | AD8676BRZ | AD8672AR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | General Purpose | General Purpose |
| Number of Circuits | 2 | 2 |
| Slew Rate | 2.5V/µs | 4V/µs |
| Gain Bandwidth Product | 10 MHz | 10 MHz |
| Current - Input Bias | 2 nA | 3 nA |
| Voltage - Input Offset | 12 µV | 20 µV |
| Supply Current | 2.7mA (x2 Channels) | 3mA (x2 Channels) |
| Current - Output / Channel | 20 mA | 20 mA |
| Voltage - Supply Span(Min) | 10 V | 10 V |
| Voltage - Supply Span(Max) | 36 V | 36 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Output Type | Rail-to-Rail | - |
Frequently asked questions
What are the primary differences between the AD8676BRZ and the AD8672AR?
The AD8676BRZ is a dual, precision, low-noise operational amplifier specified for ±5 V to ±15 V supplies, offered in an 8-lead SOIC package with a B-grade grade. The AD8672AR is a dual, low-noise, low-power op amp specified for ±5 V to ±15 V supplies in an 8-lead SOIC package with an A-grade. The AD8676BRZ is characterized by lower offset voltage and lower voltage noise, while the AD8672AR is a lower-power device with higher input bias current.
Are the AD8676BRZ and AD8672AR pin-compatible?
Yes. Both devices are dual operational amplifiers in the standard 8-lead SOIC (R-8) package with the same pinout: 1 = OUT A, 2 = -IN A, 3 = +IN A, 4 = V-, 5 = +IN B, 6 = -IN B, 7 = OUT B, 8 = V+. This allows the same PCB land pattern to be used for either part.
How do the input offset voltage specifications compare?
The AD8676BRZ has a maximum input offset voltage of 75 µV (B grade) at 25°C. The AD8672AR has a maximum input offset voltage of 125 µV (A grade) at 25°C. The AD8676BRZ therefore offers tighter DC precision for applications sensitive to offset error.
How does voltage noise density compare between the two parts?
The AD8676BRZ specifies a voltage noise density of 2.8 nV/√Hz at 1 kHz. The AD8672AR specifies a voltage noise density of 8 nV/√Hz at 1 kHz. The AD8676BRZ provides lower voltage noise, making it preferable for low-noise signal conditioning.
What are the supply current requirements of each device?
The AD8676BRZ draws a typical supply current of 2.7 mA per amplifier. The AD8672AR draws a typical supply current of 1.3 mA per amplifier. The AD8672AR is the lower-power option for battery-powered or power-sensitive designs.
How do the input bias current specifications differ?
The AD8676BRZ has a typical input bias current of 2 nA. The AD8672AR has a typical input bias current of 12 nA. The AD8676BRZ is better suited to high-impedance source applications where bias current errors must be minimized.
Do both devices support the same supply voltage range and gain bandwidth?
Yes. Both the AD8676BRZ and AD8672AR operate from ±5 V to ±15 V dual supplies (10 V to 30 V total) and both have a gain bandwidth product of 10 MHz. They also share a slew rate of 2.5 V/µs, so AC performance is comparable for many signal-chain designs.
Can the AD8672AR be used as a drop-in replacement for the AD8676BRZ?
Pin compatibility and shared supply range and gain bandwidth allow the AD8672AR to be placed in the same socket, but it is not a performance-equivalent drop-in replacement. The AD8672AR has higher offset voltage, higher voltage noise, and higher input bias current, so the substitution must be validated against the noise, DC accuracy, and input impedance requirements of the target design.