Part A
AD780ARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3641 PCS
- Package
- SOIC-8
- Series
- PMIC - référence de tension
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 Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6156 PCS
- Package
- SOIC-24
- Series
- Acquisition de données - convertisseur numérique - analogique (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. |
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 | 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 | - |
Frequently asked questions
Are the AD780ARZ and AD7808BR the same type of component?
No. The AD780ARZ is a high-precision 2.5 V/3.0 V voltage reference from Analog Devices, while the AD7808BR is an 8-bit multiplying digital-to-analog converter (DAC) from Analog Devices. They serve different functions and are not interchangeable.
What are the key differences in function between the AD780ARZ and AD7808BR?
The AD780ARZ provides a stable reference voltage output (selectable 2.5 V or 3.0 V) for use by ADCs, DACs, and other precision circuits. The AD7808BR is a multiplying DAC that converts digital input codes into an analog output current/voltage, typically used in signal generation and attenuation applications.
Do the AD780ARZ and AD7808BR use the same package type?
No. The AD780ARZ is supplied in an 8-lead SOIC package, while the AD7808BR is supplied in a 20-lead SOIC (wide body) package. Their pin counts and footprints differ, so they are not PCB-compatible.
Can the AD780ARZ be used as a direct replacement for the AD7808BR?
No. Because the AD780ARZ is a voltage reference and the AD7808BR is a multiplying DAC, they have different functions, pinouts, and package sizes. A direct substitution is not possible without redesigning the circuit.
What supply voltage ranges do the AD780ARZ and AD7808BR require?
The AD780ARZ operates from a supply range of approximately 4.0 V to 36 V. The AD7808BR operates from a dual supply of ±5 V to ±15 V (or a single supply where applicable per the datasheet). Designers should confirm exact limits in the respective manufacturer datasheets.
Which applications typically use the AD780ARZ versus the AD7808BR?
The AD780ARZ is commonly used as a precision voltage reference in data acquisition systems, instrumentation, and ADC/DAC reference circuits. The AD7808BR is used in multiplying DAC applications such as programmable attenuators, waveform generation, and digitally controlled signal scaling.
Are the AD780ARZ and AD7808BR both manufactured by Analog Devices?
Yes. Both the AD780ARZ and AD7808BR are Analog Devices products. The AD780ARZ is part of the AD780 voltage reference family, and the AD7808BR is part of the AD7808 multiplying DAC family.