Part A
AD780ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3641 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Not a drop-in replacement
The AD780ARZ and AD7808BR are not functionally interchangeable; the AD780ARZ is a precision 2.5 V voltage reference, while the AD7808BR is an 8-bit multiplying D/A converter, so they differ in core function, package, and electrical characteristics and cannot serve as substitutes for one another.
Different device function
Different package type
Different pin configuration
Different supply requirements
Parts at a glance
Part B
AD7808BR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6156 PCS
- Package
- SOIC-24
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
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 | AD7808BR | Why it matters |
|---|---|---|---|
| Function / Type | Voltage reference (2.5 V / 3.0 V ultrahigh precision) | 8-bit multiplying DAC (digital-to-analog converter) | These are fundamentally different device classes, so they are not functionally substitutable in any design. |
| Package | 8-lead SOIC (R-8) | 20-lead SOIC (R-20) | Different footprint and pin count prevent drop-in board replacement. |
| Supply voltage | 4.0 V to 36 V input | 5 V (single supply, TTL/CMOS compatible) | Operating voltage range determines compatibility with the system power rail. |
| Output / resolution | Fixed 2.5 V or 3.0 V reference output | 8-bit current output DAC | A reference provides a stable DC voltage, while a DAC produces a digitally programmable analog output. |
| Interface | None (analog output only) | Parallel digital input (8-bit) | The DAC requires a digital bus for control, whereas the reference has no digital interface. |
| Initial accuracy / precision | ±1 mV (2.5 V), ±1 mV (3.0 V) typical high precision | 8-bit resolution (1 LSB = 1/256 of full scale) | Precision specs define how accurately each device delivers its intended analog function. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover industrial temperature range, so thermal environment is not a differentiator here. |
| Typical application | ADC/DAC reference, precision instrumentation | Digital gain/attenuation control, programmable analog output | Intended use cases differ, confirming they serve distinct roles in a signal chain. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD780ARZ | AD7808BR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | - | 10 |
| Number of D/A Converters | - | 8 |
| Settling Time | - | 4µs |
| Output Type | Programmable | Voltage - Buffered |
| Differential Output | - | No |
| Data Interface | - | SPI |
| Reference Type | Series, Shunt | External, Internal |
| Voltage - Supply, Analog | - | 3V ~ 5.5V |
| Voltage - Supply, Digital | - | 3V ~ 5.5V |
| INL / DNL(LSB) | - | ±4 (Max), ±0.125 |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°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 | - |