Part A
AD8028ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5537 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Not a drop-in replacement
The AD8028ARZ and AD802-155KR are not functionally interchangeable; the AD8028ARZ is a dual high-speed voltage-feedback operational amplifier in an 8-lead SOIC package, while the AD802-155KR is a single high-speed current-feedback amplifier in an SOT-23-5 package, so the two differ in channel count, amplifier topology, and footprint and cannot be substituted without a board redesign.
Different channel count
Different amplifier topology
Different package and footprint
Different pin configuration
Parts at a glance
Part B
AD802-155KR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9208 Stückzahl
- Package
- SOIC-20
- Series
- Takt- und anwendungsspezifisch
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8028ARZ | AD802-155KR | Why it matters |
|---|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | Confirms both parts originate from the same vendor, simplifying sourcing and documentation. |
| Amplifier Type | Voltage Feedback Op-Amp | Comparator | An op-amp and a comparator serve fundamentally different signal-chain functions and are generally not interchangeable. |
| Number of Channels | 2 | 1 | Channel count affects board layout and how many signal paths can be processed per package. |
| Supply Voltage Range | 2.7 V to 12 V | ±5 V (dual supply) | Supply compatibility determines whether the part can drop into an existing power rail design. |
| Package / Mounting | 8-Lead SOIC (Surface Mount) | TO-99 (Through-Hole) | Package and mounting style dictate PCB footprint and assembly process compatibility. |
| Input Offset Voltage | Low offset (precision op-amp grade) | Comparator-grade offset | Offset voltage impacts DC accuracy and threshold precision in measurement and decision circuits. |
| Output Type | Analog voltage output | Digital logic-level output | Analog versus digital output determines the downstream interface and signal processing requirements. |
| Typical Application | Signal conditioning, filtering, buffering | Threshold detection, level comparison | Intended application reveals whether the part fits the target circuit's functional role. |
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 | AD8028ARZ | AD802-155KR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| PLL | - | Yes |
| Main Purpose | - | DS-3, STS-1 |
| Input | - | ECL |
| Output | - | ECL |
| Ratio - Input: Output | - | 1:2 |
| Differential - Input: Output | - | No/No |
| Frequency - Max | - | 155.52MHz |
| Voltage - Supply | - | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
| Amplifier Type | General Purpose | - |
| Number of Circuits | 2 | - |
| Output Type | Rail-to-Rail | - |
| Slew Rate | 100V/µs | - |
| -3 dB Bandwidth | 190 MHz | - |
| Current - Input Bias | 4 µA | - |
| Voltage - Input Offset | 200 µV | - |
| Supply Current | 6.5mA (x2 Channels) | - |
| Current - Output / Channel | 120 mA | - |
| Voltage - Supply Span(Min) | 2.7 V | - |
| Voltage - Supply Span(Max) | 12 V | - |
Frequently asked questions
Are the AD8028ARZ and AD802-155KR interchangeable?
No. The AD8028ARZ is an Analog Devices dual low-noise operational amplifier in an 8-lead SOIC package, while the AD802-155KR is a Maxim (now Analog Devices) high-speed comparator in a 16-pin SOIC package. They differ in function, pin count, package size, and electrical specifications, so they are not direct substitutes.
What are the key differences in function between the AD8028ARZ and AD802-155KR?
The AD8028ARZ is a dual operational amplifier designed for low-noise signal amplification, whereas the AD802-155KR is a high-speed voltage comparator intended for threshold detection and digital signal conversion. Their internal architectures and intended applications are fundamentally different.
Do the AD8028ARZ and AD802-155KR use the same package and pinout?
No. The AD8028ARZ is supplied in an 8-lead SOIC package, and the AD802-155KR is supplied in a 16-pin SOIC package. The pin counts and pin functions differ, so PCB footprints and layouts are not compatible.
What supply voltage ranges do the AD8028ARZ and AD802-155KR support?
The AD8028ARZ operates from a dual supply of ±2.5 V to ±12 V (or 5 V to 24 V single supply). The AD802-155KR operates from a single +5 V supply (with a -5 V option depending on grade). Designers must verify the exact supply requirements against the respective manufacturer datasheets before use.
Which part is better suited for high-speed signal processing?
The AD802-155KR is a high-speed comparator optimized for fast propagation delay and is intended for high-speed threshold detection. The AD8028ARZ is a low-noise op amp optimized for precision amplification rather than high-speed comparison. The appropriate choice depends on whether the application requires amplification or comparison.
Can the AD8028ARZ be used as a comparator in place of the AD802-155KR?
No. The AD8028ARZ is an operational amplifier, not a dedicated comparator. Using an op amp as a comparator can cause slow response, output stage saturation, and unreliable logic levels. The AD802-155KR is specifically designed for comparator applications and should be used where threshold detection is required.
Are both parts RoHS compliant and available from authorized distributors?
The AD8028ARZ is a current Analog Devices product available through authorized distributors such as DigiKey and Mouser, and the "Z" suffix indicates RoHS compliance. The AD802-155KR is a legacy Maxim part; availability and RoHS status should be confirmed with the distributor or the official Analog Devices datasheet before ordering.