Part A
AD780AR
Công ty 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 AD7804BRZ-REEL are not functionally interchangeable. The AD780AR is a 2.5 V high-precision voltage reference in an 8-lead SOIC package, while the AD7804BRZ-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 digital interface, so substitution requires a complete circuit redesign rather than a direct swap.
Different device function
Different channel count
Different package footprint
Different digital interface
Parts at a glance
Part B
AD7804BRZ-REEL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5539 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 | AD7804BRZ-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. |
| Package | 8-lead SOIC | 16-lead SOIC | Different package footprints and pin counts prevent drop-in board replacement. |
| Number of Channels / Outputs | 1 reference output | 4 DAC outputs | Channel count determines how many independent signals the part can provide. |
| Output Voltage / Range | 2.5 V or 3.0 V selectable reference | 0 V to VREF (buffered voltage output) | The output voltage behavior defines the usable signal range in the application. |
| Resolution | Not applicable (analog reference) | 10-bit | Resolution determines the number of discrete output levels a DAC can produce. |
| Digital Interface | None (analog device) | Serial (SPI-compatible) | A digital interface is required to program DAC codes; a reference has no such interface. |
| Supply Voltage | 4.0 V to 36 V input | 2.7 V to 5.5 V | Supply range must match the system rail to ensure proper operation. |
| Initial Accuracy / Precision | High-precision reference (tight initial tolerance) | DAC linearity specified in LSB (e.g., ±1 LSB INL) | Accuracy specifications differ in nature and cannot be directly compared between a reference and a DAC. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial temperature range, so thermal environment is not a differentiator here. |
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 | AD780AR | AD7804BRZ-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Obsolete | Active |
| 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 AD7804BRZ-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 AD7804BRZ-REEL is a quad 10-bit voltage-output DAC in a 16-lead SOIC package. They are different device categories and cannot be substituted for one another.
What are the primary functions 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 AD7804BRZ-REEL is a quad, 10-bit digital-to-analog converter with a serial interface, designed to convert digital codes into analog output voltages.
How do the package and pin count differ between the two parts?
The AD780AR is supplied in an 8-lead SOIC package. The AD7804BRZ-REEL is supplied in a 16-lead SOIC package. The differing pin counts and pin functions mean the PCB land patterns and footprints are not compatible.
Do the two parts share the same supply voltage requirements?
No. The AD780AR operates from a supply range suitable for precision references (typically 4.0 V to 36 V, with specific limits per datasheet), while the AD7804BRZ-REEL is a 5 V DAC designed to operate from a nominal 5 V supply. Designers must verify exact supply limits against the respective manufacturer datasheets.
Can the AD780AR be used as a reference for the AD7804BRZ-REEL in a mixed-signal design?
Yes, in principle a precision reference such as the AD780AR can provide the reference voltage for a DAC like the AD7804BRZ-REEL, provided the reference output voltage and drive capability meet the DAC's reference input requirements as specified in the AD7804 datasheet. The combination must be validated against both datasheets.
Which part is better suited for digital-to-analog conversion tasks?
The AD7804BRZ-REEL is the appropriate choice for digital-to-analog conversion because it is a quad 10-bit DAC. The AD780AR is a voltage reference and does not perform digital-to-analog conversion.
Are the operating temperature ranges of the two devices the same?
Both parts are offered in industrial temperature grade versions, but the exact specified operating temperature range must be confirmed from the respective manufacturer datasheets. Do not assume identical limits without verification.