Part A
AD8676ARMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6420 個数
- Package
- MSOP-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 AD8676ARMZ and AD8672ARMZ are both dual precision operational amplifiers in the same 8-lead MSOP package with identical pinout, making the AD8676ARMZ a viable functional replacement candidate for the AD8672ARMZ in most designs. The primary distinction is the AD8676ARMZ's rail-to-rail output stage versus the AD8672ARMZ's rail-to-rail input and output architecture, so supply voltage headroom, input common-mode range, and output swing requirements should be validated against the target application before substitution.
Package and Pinout
High match
Channel Count
High match
Input Common-Mode Range
Validation required
Output Swing Architecture
Validation required
Parts at a glance
Part B
AD8672ARMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3239 個数
- Package
- MSOP-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 | AD8676ARMZ | AD8672ARMZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 2 | Both are dual op-amps, so channel count is identical and does not affect substitutability. |
| Input Offset Voltage (Max) | 50 µV | 75 µV | Lower offset voltage improves DC precision; the AD8676 offers tighter offset, which matters for high-accuracy signal chains. |
| Input Bias Current (Typ) | 2 nA | 3 nA | Lower bias current reduces errors in high-impedance circuits; the AD8676 is slightly better suited for such applications. |
| Input Voltage Noise Density (Typ) | 2.8 nV/√Hz | 2.8 nV/√Hz | Identical noise performance means both are equally suitable for low-noise signal conditioning. |
| Gain Bandwidth Product | 10 MHz | 10 MHz | Same bandwidth allows equivalent AC performance and closed-loop stability in most circuits. |
| Slew Rate | 2.5 V/µs | 2.5 V/µs | Identical slew rate supports the same large-signal dynamic behavior. |
| Supply Voltage Range | ±5 V to ±15 V | ±5 V to ±15 V | Same supply range means both can drop into the same power rails without redesign. |
| Supply Current per Amplifier (Typ) | 2.5 mA | 2.5 mA | Equal quiescent current means comparable power dissipation and thermal behavior. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature ratings ensure both meet the same environmental requirements. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Same package footprint allows direct board-level substitution 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 | AD8676ARMZ | AD8672ARMZ |
|---|---|---|
| Part Status | Active | Active |
| 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 key differences between the AD8676ARMZ and AD8672ARMZ operational amplifiers?
The AD8676ARMZ is a dual, precision, ultra-low offset voltage op amp with a typical offset of 10 µV and a maximum of 50 µV, while the AD8672ARMZ is a dual, precision, low noise op amp with a typical offset of 20 µV and a maximum of 75 µV. Both are unity-gain stable and pin-compatible in the 8-lead MSOP package, but the AD8676 offers lower offset voltage and lower input bias current, whereas the AD8672 provides lower voltage noise density of 2.8 nV/√Hz typical versus 2.8 nV/√Hz for the AD8676 at 1 kHz.
Are the AD8676ARMZ and AD8672ARMZ pin-compatible in the MSOP-8 package?
Yes, both devices are offered in the same 8-lead MSOP (RM) package with identical pin functions: pin 1 and 2 are outputs, pin 3 and 4 are inverting inputs, pin 5 and 6 are non-inverting inputs, pin 7 is V+, and pin 8 is V−. This allows the two parts to share the same PCB footprint, though electrical differences must be validated for the target design.
How do the input offset voltage specifications compare between the AD8676ARMZ and AD8672ARMZ?
The AD8676ARMZ specifies a maximum input offset voltage of 50 µV with a typical value of 10 µV, while the AD8672ARMZ specifies a maximum input offset voltage of 75 µV with a typical value of 20 µV. The AD8676 therefore provides tighter offset performance for precision DC applications.
What are the supply voltage and quiescent current ratings for these two op amps?
Both the AD8676ARMZ and AD8672ARMZ operate from dual supplies of ±5 V to ±15 V (or single supply 10 V to 30 V) and are specified over the −40 °C to +125 °C temperature range. The AD8676ARMZ draws a typical supply current of 2.5 mA per amplifier, while the AD8672ARMZ draws a typical supply current of 3.0 mA per amplifier.
Which part is better suited for low-noise audio or instrumentation front ends?
The AD8672ARMZ is specified with a voltage noise density of 2.8 nV/√Hz at 1 kHz, making it suitable for low-noise signal conditioning. The AD8676ARMZ is specified with a voltage noise density of 2.8 nV/√Hz at 1 kHz as well, but its primary advantage is ultra-low offset voltage and low input bias current, making it preferable for high-impedance precision DC instrumentation. Selection depends on whether offset or noise dominates the error budget.
Can the AD8676ARMZ directly replace the AD8672ARMZ in an existing design?
Because both parts share the same MSOP-8 pinout and similar supply and temperature ratings, a direct replacement is physically possible, but the designer must verify that the offset voltage, input bias current, noise, and supply current differences do not violate the application requirements. The AD8676ARMZ has lower offset and lower supply current, while the AD8672ARMZ has a different noise and bandwidth profile; bench validation against the manufacturer datasheets is required.
What are the input bias current specifications for the AD8676ARMZ and AD8672ARMZ?
The AD8676ARMZ specifies a typical input bias current of 2 nA and a maximum of 10 nA at 25 °C, while the AD8672ARMZ specifies a typical input bias current of 12 nA and a maximum of 40 nA at 25 °C. The lower bias current of the AD8676ARMZ benefits high-impedance sensor and photodiode interfaces.
Do both devices support the same gain bandwidth and slew rate for signal conditioning?
The AD8676ARMZ has a gain bandwidth product of 10 MHz and a slew rate of 2.5 V/µs, while the AD8672ARMZ has a gain bandwidth product of 10 MHz and a slew rate of 2.5 V/µs. Both are unity-gain stable, so dynamic performance is comparable, and the choice between them should be based on offset, bias current, and noise requirements rather than AC bandwidth.