Part A
AD7801BRZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5137 PCS
- Package
- SOIC-20
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Replacement verdict
Not a drop-in replacement
The AD7801BRZ and AD780AR-REEL7 are not functionally interchangeable: the AD7801BRZ is an 8-bit voltage-output DAC in a 20-lead SOIC package, while the AD780AR-REEL7 is a 2.5 V high-precision voltage reference in an 8-lead SOIC package. Their core functions, channel counts, and footprints differ fundamentally, so substitution requires a full design review rather than a direct swap.
Different device function
Different channel count
Different package footprint
Different interface type
Parts at a glance
Part B
AD780AR-REEL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 8357 PCS
- Package
- SOIC-8
- Series
- PMIC - référence de tension
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7801BRZ | AD780AR-REEL7 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 8 | 10 | Resolution determines the number of discrete output levels; a 10-bit DAC provides 4x finer granularity than an 8-bit DAC, affecting achievable output precision. |
| Number of DAC Channels | 1 | 1 | Both are single-channel DACs, so channel count is not a differentiator for substitutability. |
| Output Type | Voltage (buffered) | Voltage (buffered) | Both provide buffered voltage outputs, simplifying interface to downstream circuitry without external op-amps. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Compatible supply ranges allow both parts to operate from the same system rails, easing drop-in replacement. |
| Digital Interface | Parallel (8-bit) | Serial (SPI/QSPI/MICROWIRE) | The interface type dictates the host controller pins and firmware; a parallel-to-serial change requires significant board and software redesign. |
| Package | 16-Lead SOIC | 8-Lead SOIC | Different package footprints and pin counts prevent direct PCB drop-in substitution without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching industrial temperature ranges ensure both parts suit the same environmental conditions. |
| Settling Time | 1 µs (typ) | 1.5 µs (typ) | Settling time affects maximum update rate; the faster AD7801BRZ supports higher-speed control loops. |
| Reference | External | Internal | An internal reference simplifies design and saves board space, while an external reference offers flexibility; this is a key architectural difference. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7801BRZ | AD780AR-REEL7 |
|---|---|---|
| Part Status | Active | Obsolete |
| Reference Type | External | Series, Shunt |
| Output Type | Voltage - Buffered | Programmable |
| 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 |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C (TA) |
| Mounting Type | - | Surface Mount |
| Number of Bits | 8 | - |
| Number of D/A Converters | 1 | - |
| Settling Time | 2µs | - |
| Differential Output | No | - |
| Data Interface | Parallel | - |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | - |
| INL / DNL(LSB) | ±1 (Max), ±1 (Max) | - |
| Architecture | Current Source | - |
Frequently asked questions
Are the AD7801BRZ and AD780AR-REEL7 functionally interchangeable?
No. The AD7801BRZ is an 8-bit voltage-output DAC, while the AD780AR-REEL7 is a 2.5 V high-precision voltage reference. They are different device categories and cannot be substituted for one another.
What are the core functions of each device?
The AD7801BRZ is a parallel-input, 8-bit digital-to-analog converter with a voltage output. The AD780AR-REEL7 is a precision 2.5 V bandgap voltage reference with selectable 2.5 V or 3.0 V output.
How do the package types differ between the two parts?
The AD7801BRZ is supplied in a 20-lead SOIC (R-20) package. The AD780AR-REEL7 is supplied in an 8-lead SOIC (R-8) package on tape and reel.
What are the supply voltage requirements for each device?
The AD7801BRZ operates from a single 2.7 V to 5.5 V supply. The AD780AR-REEL7 operates from a 4.0 V to 36 V input supply and provides a fixed 2.5 V or 3.0 V output.
What are the key resolution and accuracy specifications?
The AD7801BRZ provides 8-bit DAC resolution. The AD780AR-REEL7 provides an initial output accuracy of ±1 mV maximum and a temperature coefficient of 3 ppm/°C maximum.
Can the AD780AR-REEL7 be used as a reference for the AD7801BRZ?
Yes. The AD780AR-REEL7 can supply a stable 2.5 V or 3.0 V reference to the AD7801BRZ VREF input, provided the DAC supply and reference output levels are compatible with the target design.
What are the operating temperature ranges for these devices?
Both the AD7801BRZ and AD780AR-REEL7 are specified for the industrial temperature range of −40 °C to +85 °C.
Do the two parts share the same manufacturer?
Yes. Both the AD7801BRZ and AD780AR-REEL7 are Analog Devices products.