Part A
AD8608ARUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3744 Stückzahl
- Package
- TSSOP-14
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8608ARUZ and AD8604ARU are both quad-channel, rail-to-rail CMOS operational amplifiers from Analog Devices in the same TSSOP-14 package, sharing comparable supply voltage ranges and low input bias current characteristics. The AD8608ARUZ offers lower offset voltage and lower noise, making it the stronger choice for precision signal-conditioning applications, while the AD8604ARU provides higher output drive current and wider bandwidth for general-purpose buffering. Both are functionally interchangeable in most quad op-amp sockets, but designers should validate offset, noise, and output drive requirements against the specific circuit before substituting.
Channel Count
High match
Package Type
High match
Input Offset Voltage
Validation required
Output Drive Current
Validation required
Parts at a glance
Part B
AD8604ARU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7648 Stückzahl
- Package
- TSSOP-14
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8608ARUZ | AD8604ARU | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 4 | 4 | Both are quad op-amps, so channel count is identical and does not affect substitutability. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Identical single-supply operating range allows drop-in use in the same low-voltage systems. |
| Input Offset Voltage (max) | 65 µV | 750 µV | AD8608ARUZ has much lower offset, giving better DC precision; AD8604ARU may need calibration in precision circuits. |
| Input Bias Current (typ) | 0.2 pA | 0.2 pA | Both are CMOS inputs with negligible bias current, suitable for high-impedance sensor interfaces. |
| Gain Bandwidth Product | 10 MHz | 8.4 MHz | AD8608ARUZ offers slightly higher bandwidth, affecting achievable closed-loop speed and settling. |
| Slew Rate | 5 V/µs | 6 V/µs | AD8604ARU slews slightly faster, which can matter for large-signal transient response. |
| Input Voltage Noise Density | 6.5 nV/√Hz | 33 nV/√Hz | AD8608ARUZ is significantly quieter, important for low-level signal amplification. |
| Quiescent Current per Amplifier (typ) | 1.2 mA | 1.2 mA | Identical supply current per amplifier, so power budget is unaffected by substitution. |
| Package | 14-Lead TSSOP | 14-Lead TSSOP | Same package and pinout allow 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 | AD8608ARUZ | AD8604ARU |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | DigiTrim® | DigiTrim® |
| Part Status | Active | Obsolete |
| Amplifier Type | CMOS | CMOS |
| Number of Circuits | 4 | 4 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 5V/µs | 6V/µs |
| Gain Bandwidth Product | 10 MHz | 8.4 MHz |
| Current - Input Bias | 1 pA | 0.2 pA |
| Voltage - Input Offset | 80 µV | 80 µV |
| Supply Current | 1mA (x4 Channels) | 750µA (x4 Channels) |
| Current - Output / Channel | 80 mA | 50 mA |
| Voltage - Supply Span(Min) | 2.7 V | 2.7 V |
| Voltage - Supply Span(Max) | 5.5 V | 5.5 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD8608ARUZ and the AD8604ARU?
The AD8608ARUZ is a quad, low-noise, CMOS rail-to-rail input/output operational amplifier, while the AD8604ARU is a quad, low-power, rail-to-rail input/output operational amplifier. Both are quad op amps in TSSOP-14 packages, but they differ in their noise, bandwidth, and supply current specifications, making them suited to different applications.
Are the AD8608ARUZ and AD8604ARU pin-compatible?
Yes. Both devices are quad operational amplifiers offered in the same 14-lead TSSOP (RU) package with the same pinout, so they are pin-compatible and can share the same PCB land pattern.
How do the supply current specifications compare between the AD8608ARUZ and AD8604ARU?
The AD8604ARU is specified for a lower supply current per amplifier than the AD8608ARUZ, making it the better choice for battery-powered or power-sensitive designs. The AD8608ARUZ trades higher supply current for lower voltage noise and higher bandwidth.
Which device offers lower voltage noise, the AD8608ARUZ or the AD8604ARU?
The AD8608ARUZ offers lower voltage noise density than the AD8604ARU, making it preferable for low-noise signal-conditioning applications such as audio, sensor interfaces, and precision filtering.
What is the difference in gain bandwidth between the AD8608ARUZ and AD8604ARU?
The AD8608ARUZ has a higher gain bandwidth product than the AD8604ARU, allowing it to support wider signal bandwidths and higher closed-loop gains. The AD8604ARU is optimized for lower power consumption at reduced bandwidth.
Can the AD8604ARU be used as a drop-in replacement for the AD8608ARUZ?
Because both are quad rail-to-rail op amps in the same TSSOP-14 package with the same pinout, the AD8604ARU can physically replace the AD8608ARUZ. However, the designer must verify that the lower bandwidth and higher noise of the AD8604ARU meet the application requirements before substituting.
What supply voltage range do the AD8608ARUZ and AD8604ARU support?
Both the AD8608ARUZ and AD8604ARU operate from a single supply of 2.7 V to 5.5 V, and both feature rail-to-rail input and output swing, making them suitable for low-voltage single-supply systems.
Which device is better suited for low-power portable applications?
The AD8604ARU is better suited for low-power portable applications because it is specified for lower supply current per amplifier. The AD8608ARUZ is preferred when lower noise and higher bandwidth are required and the additional supply current is acceptable.