Part A
AD780BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3229 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Not a drop-in replacement
The AD780BRZ and AD7804BRZ-REEL are not functionally interchangeable. The AD780BRZ is a 2.5 V/3.0 V high-precision voltage reference in an SOIC-8 package, while the AD7804BRZ-REEL is a quad 10-bit voltage-output DAC in a 16-lead SOIC. 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
AD7804BRZ-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5539 PCS
- Package
- SOIC-16
- 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 | AD780BRZ | AD7804BRZ-REEL | Why it matters |
|---|---|---|---|
| Function / Type | Voltage reference (2.5 V / 3.0 V selectable) | Quad 10-bit voltage-output DAC | These are fundamentally different device classes, so they are not functionally substitutable in any design. |
| Package | 8-lead SOIC | 16-lead SOIC | Different footprint and pin count 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 (pin-selectable) | 0 V to VREF (DAC output, set by reference) | A fixed reference voltage versus a programmable analog output range serves entirely different signal-chain roles. |
| Digital interface | None (analog-only device) | Serial (SPI-compatible) digital input | Presence of a digital interface dictates whether the part can be controlled by a microcontroller or FPGA. |
| Supply voltage | 4.0 V to 36 V input | 2.7 V to 5.5 V | Supply compatibility must match the system rail; the wide-input reference cannot be powered from a low-voltage logic rail. |
| Initial accuracy / resolution | ±1 mV initial accuracy (B grade) | 10-bit DAC resolution | Accuracy versus resolution reflects the different precision metrics relevant to references and DACs respectively. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial range, so thermal environment is not a differentiator here. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD780BRZ | AD7804BRZ-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | 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 | ±0.04%, ±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 AD7804BRZ-REEL interchangeable?
No. The AD780BRZ 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 functionally different devices and cannot be substituted for one another.
What are the primary functions of the AD780BRZ and AD7804BRZ-REEL?
The AD780BRZ is a precision bandgap voltage reference offering selectable 2.5 V or 3.0 V outputs. The AD7804BRZ-REEL is a quad, 10-bit digital-to-analog converter with a serial interface, designed to generate analog output voltages from digital input codes.
How do the package types and pin counts differ between the two parts?
The AD780BRZ is supplied in an 8-lead SOIC package. The AD7804BRZ-REEL is supplied in a 16-lead SOIC package. The different pin counts and pin functions prevent any direct PCB footprint compatibility.
Do the AD780BRZ and AD7804BRZ-REEL share the same supply voltage requirements?
No. The AD780BRZ operates from a supply range of 4.0 V to 36 V. The AD7804BRZ-REEL operates from a single 3.3 V to 5.5 V supply (or dual supplies depending on configuration). The supply requirements are not equivalent.
What are the output resolution and accuracy specifications for each device?
The AD780BRZ provides a fixed reference output of 2.5 V or 3.0 V with initial accuracy grades specified in its datasheet (B grade). The AD7804BRZ-REEL provides four 10-bit DAC channels with a resolution of 10 bits (1024 codes) and accuracy specifications defined in its respective datasheet.
Can the AD780BRZ be used as a reference for the AD7804BRZ-REEL in a mixed-signal design?
Yes, in principle the AD780BRZ can serve as an external voltage reference for the AD7804BRZ-REEL, provided the reference voltage and drive requirements of the DAC are satisfied per the AD7804 datasheet. This is a system-level design consideration, not a direct replacement scenario.
What are the operating temperature ranges for the AD780BRZ and AD7804BRZ-REEL?
Both devices are specified for the industrial temperature range of −40 °C to +85 °C, as stated in their respective manufacturer datasheets.
Which part should be selected for a voltage reference application versus a multi-channel analog output application?
For a stable voltage reference, the AD780BRZ is the appropriate choice. For generating multiple analog output voltages from digital codes, the AD7804BRZ-REEL (quad 10-bit DAC) is the appropriate choice. Selection depends on the system function required.