Part A
AD780BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3229 PCS
- Package
- SOIC-8
- Series
- PMIC - Voltage Reference
Replacement verdict
Not a drop-in replacement
The AD780BRZ and AD7801BR are not functionally interchangeable: the AD780BRZ is a precision voltage reference, while the AD7801BR is an 8-bit voltage-output DAC. They differ in core function, output type, package, and interface, so the AD7801BR cannot serve as a substitute for the AD780BRZ in reference applications.
Different device function
Different output type
Different package
Different interface
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD780BRZ | AD7801BR | Why it matters |
|---|---|---|---|
| Function / Device Type | Voltage reference (2.5 V / 3.0 V ultrahigh precision) | 8-bit voltage-output DAC | These are fundamentally different device classes; a reference and a DAC are not functionally interchangeable in a circuit. |
| Output Type | Fixed reference voltage (2.5 V or 3.0 V selectable) | Digital-to-analog converted voltage (current-to-voltage output) | A reference provides a stable DC level, while a DAC produces an analog voltage set by a digital code; the output behavior differs completely. |
| Supply Voltage Range | 4.0 V to 36 V | 2.7 V to 5.5 V | Operating supply range determines compatibility with the system power rail; the reference tolerates much higher supplies than the DAC. |
| Resolution / Precision | 2.5 V / 3.0 V output, ±1 mV initial accuracy (B grade) | 8-bit DAC resolution | Precision and resolution define the accuracy of the output; the reference offers millivolt-level accuracy while the DAC is quantized to 8 bits. |
| Interface | Analog (no digital interface) | Parallel digital input (8-bit) | The DAC requires a digital bus to load codes, whereas the reference is a purely analog device with no digital control. |
| Package | 8-lead SOIC | 20-lead SOIC | Different package footprints and pin counts prevent direct board-level substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both share the same industrial temperature range, so thermal environment compatibility is equivalent. |
| Typical Application | Precision reference for ADCs/DACs, instrumentation | Digital control of analog levels, gain/offset adjustment | Intended use cases differ; one stabilizes a system reference while the other generates a programmable analog output. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD780BRZ | 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 | ±0.04%, ±0.03% | - |
| Temperature Coefficient | 3ppm/°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 AD780BRZ and AD7801BR functionally interchangeable?
No. The AD780BRZ is a 2.5 V/3.0 V high-precision voltage reference, while the AD7801BR is an 8-bit voltage-output digital-to-analog converter (DAC). They serve different functions and are not interchangeable.
What is the primary function of the AD780BRZ?
The AD780BRZ is a precision bandgap voltage reference offering selectable 2.5 V or 3.0 V output, intended to provide a stable reference for ADCs, DACs, and other precision analog circuitry.
What is the primary function of the AD7801BR?
The AD7801BR is an 8-bit, single-channel, voltage-output DAC with a parallel interface, designed to convert digital input codes into an analog output voltage.
Do the AD780BRZ and AD7801BR use the same package and pinout?
No. The AD780BRZ is offered in an 8-lead SOIC package, while the AD7801BR is offered in a 20-lead SOIC (wide body) package. Their pin counts, pin functions, and PCB land patterns differ, so they are not footprint-compatible.
Can the AD780BRZ be used as the reference for the AD7801BR?
Yes. The AD780BRZ provides a stable 2.5 V or 3.0 V reference that can be applied to the AD7801BR's reference input to set the DAC's full-scale output range, provided the system supply and reference requirements are satisfied per the respective datasheets.
Do both devices operate from the same supply voltage range?
No. The AD780BRZ operates from a supply of 4.0 V to 36 V (or ±2.0 V to ±18 V dual supply), while the AD7801BR operates from a single 2.7 V to 5.5 V supply. The supply requirements are therefore different and must be verified against each datasheet.
Which device has a digital interface?
The AD7801BR has a parallel digital input interface for loading DAC codes. The AD780BRZ is an analog voltage reference and has no digital interface.
Are the AD780BRZ and AD7801BR available in the same temperature grade?
Both are specified for the industrial temperature range of −40 °C to +85 °C. Confirm the exact grade and ordering code against the manufacturer datasheet for the specific design.