Part A
AD780BRZ-REEL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6342 PCS
- Package
- SOIC-8
- Series
- PMIC - Voltage Reference
Replacement verdict
Not a drop-in replacement
The AD780BRZ-REEL and AD7801BR are not functionally interchangeable: the AD780BRZ-REEL is a high-precision 2.5 V/3.0 V voltage reference in an SOIC-8 package, while the AD7801BR is an 8-bit parallel-input voltage-output DAC in a 20-lead SSOP. They differ in core function, interface, package, and supply requirements, so substitution requires a full redesign rather than a direct swap.
Different device function
Different digital interface
Different package footprint
Different supply requirements
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-REEL | AD7801BR | Why it matters |
|---|---|---|---|
| Function / Type | Voltage reference (2.5 V / 3.0 V ultrahigh precision) | 8-bit voltage-output DAC | These are fundamentally different device classes; a reference and a DAC are not functionally interchangeable in a circuit. |
| Output Type | Fixed reference voltage output | Digital-to-analog converted voltage output | A reference provides a stable DC level, while a DAC produces a programmable analog output from digital input codes. |
| Supply Voltage Range | 4.0 V to 36 V input | 2.7 V to 5.5 V | Different supply requirements determine compatibility with the system power rail. |
| Package | 8-lead SOIC | 20-lead SOIC | Package footprint and pin count affect PCB layout and cannot be swapped without redesign. |
| Interface | Analog (no digital interface) | Parallel digital interface | The DAC requires a digital bus for control, whereas the reference has no digital interface at all. |
| Resolution / Precision | Ultrahigh precision reference (low drift, tight initial accuracy) | 8-bit DAC resolution | Precision specifications define the accuracy of the reference, while resolution defines the DAC's step granularity. |
| Number of Pins | 8 | 20 | Pin count mismatch prevents direct drop-in substitution on an existing board. |
| Primary Application Role | Provides stable reference for ADCs/DACs and measurement systems | Generates programmable analog output signals | Their roles in a signal chain differ, so one cannot replace the other functionally. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD780BRZ-REEL | AD7801BR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | - | 8 |
| Number of D/A Converters | - | 1 |
| Settling Time | - | 2µs |
| Output Type | Programmable | Voltage - Buffered |
| Differential Output | - | No |
| Data Interface | - | Parallel |
| Reference Type | Series, Shunt | External |
| Voltage - Supply, Analog | - | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | - | 2.7V ~ 5.5V |
| INL / DNL(LSB) | - | ±1 (Max), ±1 (Max) |
| Architecture | - | Current Source |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 105°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-REEL and AD7801BR functionally interchangeable?
No. The AD780BRZ-REEL is a 2.5 V/3.0 V high-precision voltage reference, while the AD7801BR is an 8-bit voltage-output digital-to-analog converter. They serve different functions and are not direct substitutes.
What is the primary function of the AD780BRZ-REEL?
The AD780BRZ-REEL is a precision bandgap voltage reference offering selectable 2.5 V or 3.0 V output, intended to provide a stable reference for ADCs, DACs, and other precision analog circuitry.
What is the primary function of the AD7801BR?
The AD7801BR is an 8-bit, parallel-input, voltage-output DAC that converts digital input codes into an analog output voltage, typically used in control and signal-generation applications.
Do the AD780BRZ-REEL and AD7801BR use the same package?
No. The AD780BRZ-REEL is supplied in an 8-lead SOIC package, while the AD7801BR is supplied in a 20-lead SOIC package. Their pin counts and footprints differ, so they are not PCB-compatible.
Can the AD780BRZ-REEL be used as the reference for the AD7801BR?
Yes. The AD780BRZ-REEL can provide a stable external reference voltage to the AD7801BR, which supports an external reference input, making them complementary rather than interchangeable parts.
How do the supply voltage requirements compare?
The AD780BRZ-REEL operates from a wide supply range suitable for 5 V and 3 V systems, while the AD7801BR operates from a single 2.7 V to 5.5 V supply. Both are compatible with common 3 V and 5 V rails, but each should be verified against its own datasheet limits.
Which part is appropriate for generating an analog output signal?
The AD7801BR is the appropriate choice for generating an analog output signal because it is a DAC. The AD780BRZ-REEL only provides a fixed reference voltage and cannot produce a variable analog output.
Are the AD780BRZ-REEL and AD7801BR available in reel packaging?
The AD780BRZ-REEL suffix indicates tape-and-reel packaging for the voltage reference. The AD7801BR is a standard tube or tray orderable part number; reel options for the DAC should be confirmed via the manufacturer's ordering guide.