Part A
AD780AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6622 PCS
- Package
- SOIC-8
- Series
- PMIC - Voltage Reference
Replacement verdict
Not a drop-in replacement
The AD780AR and AD7804BR-REEL are not functionally interchangeable. The AD780AR is a 2.5 V high-precision voltage reference in an 8-lead SOIC package, while the AD7804BR-REEL is a quad 10-bit voltage-output DAC in a 16-lead SOIC package. They differ in core function, channel count, package footprint, and interface architecture, so substituting one for the other is not feasible without a complete circuit redesign.
Different device function
Different channel count
Different package footprint
Different interface architecture
Parts at a glance
Part B
AD7804BR-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9709 PCS
- Package
- SOIC-16
- Series
- Data Acquisition - Digital to Analog Converters (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 | AD780AR | AD7804BR-REEL | Why it matters |
|---|---|---|---|
| Function / Device Type | Voltage reference (2.5 V / 3.0 V ultrahigh precision reference) | Quad 10-bit voltage-output DAC with serial interface | These are fundamentally different device classes (a reference vs. a DAC), so they are not functionally substitutable in most designs. |
| Output Type | Fixed voltage reference output (2.5 V or 3.0 V selectable) | Four voltage-output DAC channels | A reference provides a stable DC level, while a DAC generates programmable analog outputs; the output behavior is entirely different. |
| Number of Channels | 1 reference output | 4 DAC channels | Channel count determines how many independent signals the part can provide in a system. |
| Resolution / Accuracy | Ultrahigh precision reference (low initial error and low temperature drift) | 10-bit DAC resolution | Resolution/accuracy defines the precision of the output; a reference specifies DC accuracy while a DAC specifies quantization steps. |
| Digital Interface | None (analog reference, no digital control) | Serial digital interface for programming DAC codes | The DAC requires a digital bus to set outputs, whereas the reference needs no digital communication, affecting system architecture. |
| Supply Voltage | Operates from a low supply (typically 4 V to 36 V range for the reference family) | Single-supply operation (typically 2.7 V to 5.5 V) | Supply compatibility determines whether the part can be powered directly from the system rail without additional regulation. |
| Package | 8-lead SOIC (surface-mount) | 16-lead SOIC (surface-mount, tape and reel) | Package footprint and pin count affect PCB layout and whether a drop-in replacement is physically possible. |
| Typical Application | Precision references for ADCs/DACs, instrumentation, and calibration systems | Programmable analog outputs, digital-to-analog conversion, control loops | Application role clarifies whether the part serves as a stable reference or as a signal-generation element in the design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD780AR | AD7804BR-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| Number of Bits | - | 10 |
| Number of D/A Converters | - | 4 |
| 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) | - | ±3 (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 AD780AR and AD7804BR-REEL functionally interchangeable?
No. The AD780AR is a 2.5 V/3.0 V high-precision voltage reference in an 8-lead SOIC package, while the AD7804BR-REEL is a quad 10-bit voltage-output DAC in a 16-lead SOIC package. They are different device categories with different functions, pinouts, and package sizes, so they cannot be substituted for one another.
What is the primary function of each device?
The AD780AR is a precision bandgap voltage reference offering selectable 2.5 V or 3.0 V output with low temperature drift. The AD7804BR-REEL is a quad, 10-bit, serial-input voltage-output digital-to-analog converter with an on-chip reference, intended for multi-channel analog output applications.
How do the package and pin count differ between the two parts?
The AD780AR is supplied in an 8-lead SOIC package. The AD7804BR-REEL is supplied in a 16-lead SOIC package in tape-and-reel format. The differing pin counts and land patterns mean the two devices are not footprint-compatible.
Do both parts include an on-chip reference?
The AD780AR is itself a standalone voltage reference device. The AD7804BR-REEL is a DAC that integrates an on-chip reference. The reference specifications, output values, and accuracy grades differ between the two devices and should be compared using the respective manufacturer datasheets.
Which part is better suited for generating analog output signals?
The AD7804BR-REEL is the appropriate choice for generating analog output signals because it is a quad 10-bit DAC with serial digital input. The AD780AR provides a fixed precision reference voltage and does not convert digital codes to analog outputs.
Which part is better suited for providing a system reference voltage?
The AD780AR is designed specifically as a precision voltage reference for ADC, DAC, and comparator reference inputs. The AD7804BR-REEL contains an internal reference for its own DAC channels but is not intended as a general-purpose system reference source.
Can the AD780AR be used as the reference for the AD7804BR-REEL?
This cannot be confirmed from verified public data without reviewing the specific circuit configuration and the AD7804BR-REEL reference input requirements in the manufacturer datasheet. The AD7804BR-REEL already includes an on-chip reference, and any external reference arrangement must be validated against the datasheet before use.
What ordering format difference should buyers note?
The AD780AR is ordered as a tube or standard SOIC-packaged reference device, while the AD7804BR-REEL suffix indicates tape-and-reel packaging for automated assembly. Buyers should confirm the exact orderable part number, package, and temperature grade against the manufacturer or authorized distributor listing before purchasing.