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 AD8604DRU-REEL are both quad-channel, rail-to-rail CMOS operational amplifiers from Analog Devices, sharing the same TSSOP-14 package and broadly comparable supply and bandwidth characteristics. The AD8608ARUZ is a strong functional replacement candidate for the AD8604DRU-REEL in most designs, though the tighter offset voltage and lower input bias current of the AD8608ARUZ should be validated against application requirements before substitution.
Amplifier Channel Count
High match
Package Type
High match
Input Offset Voltage
Validation required
Supply Voltage Range
High match
Parts at a glance
Part B
AD8604DRU-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9301 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 | AD8604DRU-REEL | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 4 | 4 | Both are quad op-amps, so channel count is functionally equivalent for multi-channel signal conditioning. |
| Input Offset Voltage (max) | 65 µV | 750 µV | Lower offset voltage improves DC precision; the AD8608 is roughly an order of magnitude more precise than the AD8604. |
| Input Bias Current (typ) | 0.2 pA | 0.2 pA | Ultra-low CMOS input bias current suits high-impedance sensor and photodiode front-ends; both parts are equivalent here. |
| Gain Bandwidth Product | 10 MHz | 8.4 MHz | GBW sets the achievable closed-loop bandwidth; the AD8608 offers slightly more speed for the same quiescent current class. |
| 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 3 V and 5 V systems. |
| Supply Current per Amplifier (typ) | 1.2 mA | 1.2 mA | Quiescent current drives power budget; both parts draw the same per-amplifier current, so power impact is equivalent. |
| Input Voltage Noise Density | 8 nV/√Hz | 33 nV/√Hz | Lower noise density benefits low-level signal amplification; the AD8608 is significantly quieter than the AD8604. |
| Package | 14-Lead TSSOP | 14-Lead TSSOP | Same package and pinout enable direct PCB substitution without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | The wider temperature rating of the AD8608 supports harsher environments where the AD8604 would be out of spec. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8608ARUZ | AD8604DRU-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| 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 | 1.3 mV |
| 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 AD8604DRU-REEL?
The AD8608ARUZ is a quad, low-noise, CMOS rail-to-rail input/output operational amplifier from Analog Devices supplied in a 14-lead TSSOP (RU-14) package and specified for operation from 2.7 V to 5.5 V. The AD8604DRU-REEL is a quad, rail-to-rail input/output operational amplifier from the same AD8604 family, supplied in a 14-lead TSSOP package on tape and reel. Both are quad CMOS rail-to-rail amplifiers in the same TSSOP-14 footprint, but they differ in their specified noise, bandwidth, and supply-current performance, so the exact datasheet for each part number must be consulted before substitution.
Are the AD8608ARUZ and AD8604DRU-REEL pin-compatible?
Both devices are quad operational amplifiers offered in the 14-lead TSSOP (RU-14) package, which uses the standard quad op-amp pinout (OUT A, -IN A, +IN A, V-, +IN B, -IN B, OUT B, OUT C, -IN C, +IN C, V+, +IN D, -IN D, OUT D). Because they share the same package and pinout, they are pin-compatible at the package level; however, electrical differences between the two part numbers must still be validated for the target design.
What supply voltage range do these amplifiers support?
Both the AD8608 and AD8604 families are specified for single-supply operation from 2.7 V to 5.5 V (and equivalent dual-supply rails within that total). Designs should confirm the exact supply range and any absolute maximum ratings in the respective Analog Devices datasheet for the specific part number before use.
Do these op-amps have rail-to-rail input and output capability?
Yes. Both the AD8608 and AD8604 are CMOS rail-to-rail input and output (RRIO) operational amplifiers, allowing input signals to swing to both supply rails and output swing close to the rails, which makes them suitable for low-voltage single-supply signal conditioning.
What form does the AD8604DRU-REEL packaging take?
The AD8604DRU-REEL is supplied in the 14-lead TSSOP (RU-14) package in tape-and-reel format, which is intended for automated high-volume PCB assembly. The AD8608ARUZ is supplied in the same 14-lead TSSOP package; buyers should confirm the exact packaging (tube, tray, or reel) for the specific orderable part number from the manufacturer or authorized distributor.
Can the AD8608ARUZ and AD8604DRU-REEL be used interchangeably in a design?
They are not automatically interchangeable. Although both are quad CMOS RRIO amplifiers in the same TSSOP-14 package, the AD8608 and AD8604 differ in specified parameters such as noise density, gain bandwidth, and supply current. A substitution should only be made after comparing the relevant specifications in the official Analog Devices datasheets and verifying that the differences do not affect the target circuit's performance, stability, or accuracy.
Are these parts RoHS compliant?
The "Z" suffix in AD8608ARUZ denotes a lead-free, RoHS-compliant package per Analog Devices' ordering nomenclature. For the AD8604DRU-REEL, RoHS status should be confirmed against the specific orderable part number and the manufacturer's current compliance documentation, since compliance declarations are tied to the exact part number and revision.