Part A
AD780ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3641 PCS
- Package
- SOIC-8
- Series
- PMIC - Voltage Reference
Replacement verdict
Not a drop-in replacement
The AD780ARZ and AD7801BR are not functionally interchangeable: the AD780ARZ is a precision voltage reference, while the AD7801BR is an 8-bit voltage-output DAC. Their core functions, output characteristics, and package pinouts differ fundamentally, so the AD7801BR cannot serve as a substitute for the AD780ARZ in reference applications.
Different device function
Different output type
Different package type
Different pin configuration
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD780ARZ | AD7801BR | Why it matters |
|---|---|---|---|
| Function / Type | Voltage reference (2.5 V / 3.0 V ultrahigh precision) | 8-bit voltage-output DAC | These are fundamentally different device classes; one provides a stable reference voltage while the other converts digital codes to analog output, so they are not functionally substitutable. |
| Output Type | Fixed 2.5 V or 3.0 V reference output | Buffered voltage output proportional to digital input | The output behavior determines how the part is used in a signal chain; a reference supplies a constant level, whereas a DAC produces a variable analog level. |
| Resolution / Precision | 2.5 V / 3.0 V with ±1 mV initial accuracy (A grade) | 8-bit DAC resolution | Precision and resolution define the achievable accuracy of the analog output, which is critical for measurement and control applications. |
| Supply Voltage Range | 4.0 V to 36 V input | 2.7 V to 5.5 V | The supply range must match the system rail; a part rated for a wider or narrower range may not operate reliably in the target design. |
| Package | 8-lead SOIC | 20-lead SOIC | Package footprint and pin count affect PCB layout and cannot be swapped without a board redesign. |
| Interface | Analog output only (no digital interface) | Parallel digital input interface | The presence or absence of a digital interface determines how the device is controlled by a microcontroller or FPGA. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both share the same industrial temperature range, so thermal environment is not a differentiator here. |
| Typical Application | ADC/DAC reference, precision instrumentation | Digital-to-analog signal generation, control loops | Intended use cases highlight that these parts serve complementary rather than interchangeable roles in a system. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD780ARZ | AD7801BR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | - | 8 |
| Number of D/A Converters | - | 1 |
| Settling Time | - | 2µs |
| Output Type | Programmable | Voltage - Buffered |
| Differential Output | - | No |
| Data Interface | - | Parallel |
| Reference Type | Series, Shunt | External |
| Voltage - Supply, Analog | - | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | - | 2.7V ~ 5.5V |
| INL / DNL(LSB) | - | ±1 (Max), ±1 (Max) |
| Architecture | - | Current Source |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 105°C |
| Voltage - Output (Min/Fixed) | ±2.5V, ±3V | - |
| Current - Output | 10 mA | - |
| Tolerance | ±0.2%, ±0.17% | - |
| Temperature Coefficient | 7ppm/°C | - |
| Noise - 01 Hzto10 Hz | 4µVp-p | - |
| Voltage - Input | 4V ~ 36V | - |
| Supply Current | 1mA | - |
| Current - Cathode | 1 mA | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
Are the AD780ARZ and AD7801BR functionally interchangeable?
No. The AD780ARZ is a 2.5 V/3.0 V high-precision voltage reference in an 8-lead SOIC package, while the AD7801BR is an 8-bit voltage-output DAC in a 20-lead SOIC package. They are different device categories with different functions, pinouts, and package footprints, so they cannot be substituted for one another.
What are the primary functions of the AD780ARZ and AD7801BR?
The AD780ARZ is a precision bandgap voltage reference offering selectable 2.5 V or 3.0 V output with high accuracy and low temperature drift. The AD7801BR is an 8-bit parallel-input voltage-output digital-to-analog converter with an on-chip output amplifier.
How do the package and pin count differ between the AD780ARZ and AD7801BR?
The AD780ARZ is supplied in an 8-lead SOIC package, whereas the AD7801BR is supplied in a 20-lead SOIC package. The differing pin counts and pin functions prevent any direct PCB-level interchange.
What is the resolution and output type of the AD7801BR?
The AD7801BR is an 8-bit DAC with a voltage output. It accepts a parallel digital input and provides a buffered voltage output, making it suitable for digital-to-analog conversion tasks rather than reference generation.
Can the AD780ARZ be used as a reference for the AD7801BR?
Yes, in principle a precision reference such as the AD780ARZ can supply a stable reference voltage to a DAC like the AD7801BR, provided the reference output voltage and drive capability meet the DAC's reference input requirements as specified in the respective datasheets. The actual configuration must be validated against both manufacturer datasheets.
Do the AD780ARZ and AD7801BR share the same supply voltage requirements?
No. Their supply requirements differ because they are different device types. The AD780ARZ operates as a precision reference with its own specified supply range, while the AD7801BR operates as a DAC with its own specified supply range. Designers must consult each device's datasheet for exact supply voltage limits.
Which device is appropriate for voltage reference applications and which for digital-to-analog conversion?
The AD780ARZ is intended for voltage reference applications requiring a stable 2.5 V or 3.0 V reference. The AD7801BR is intended for digital-to-analog conversion where an 8-bit parallel-input DAC with voltage output is required. Selection should be based on the function needed in the target design.