Part A
AD7801BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5137 PCS
- Package
- SOIC-20
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Replacement verdict
Not a drop-in replacement
The AD7801BRZ and AD7804BR-REEL are not drop-in replacements for one another. Although both are 8-bit voltage-output DACs from Analog Devices, they differ in channel count, digital interface, reference architecture, and package footprint, so a direct board-level substitution is not possible without redesign.
Different channel count
Different digital interface
Different reference architecture
Different package footprint
Parts at a glance
Part B
AD7804BR-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9709 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 | AD7801BRZ | AD7804BR-REEL | Why it matters |
|---|---|---|---|
| Resolution | 8 bit | 10 bit | Resolution determines the number of discrete output levels; a 10-bit DAC provides four times finer granularity than an 8-bit DAC, affecting precision of the analog output. |
| Number of DAC Channels | 1 | 4 | Channel count defines how many independent analog outputs are available; a quad DAC can drive four separate signals while a single DAC drives only one. |
| Digital Interface | Parallel | Serial (SPI-compatible) | The interface type dictates the host connection and pin count; parallel interfaces need more I/O lines while serial interfaces conserve pins and suit space-constrained designs. |
| Supply Voltage Range | 2.7 V to 5.5 V | 3.0 V to 5.5 V | The supply range determines compatibility with the system rail; a wider lower bound allows operation at lower voltages, which can matter for battery-powered or low-voltage systems. |
| Package | 20-lead SOIC | 16-lead SOIC | Package footprint and pin count affect PCB layout and board space; a different package requires layout changes and cannot be a drop-in physical replacement. |
| Output Type | Voltage output | Voltage output | Output type must match the downstream signal chain; both are voltage-output DACs, so the analog interface style is compatible. |
| Settling Time | 1.5 µs (typical) | 1.5 µs (typical) | Settling time indicates how quickly the DAC output reaches its final value; similar settling times mean comparable dynamic response for control-loop or waveform applications. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range defines the environments in which the part is guaranteed to meet specifications; matching ranges indicate equivalent environmental robustness. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7801BRZ | AD7804BR-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 8 | 10 |
| Number of D/A Converters | 1 | 4 |
| Settling Time | 2µs | 4µs |
| Output Type | Voltage - Buffered | Voltage - Buffered |
| Differential Output | No | No |
| Data Interface | Parallel | SPI |
| Reference Type | External | External, Internal |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 3V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 3V ~ 5.5V |
| INL / DNL(LSB) | ±1 (Max), ±1 (Max) | ±3 (Max), ±0.125 |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
| Architecture | Current Source | - |
Frequently asked questions
What are the key differences between the AD7801BRZ and AD7804BR-REEL?
The AD7801BRZ is a single 8-bit voltage-output DAC in an 8-lead SOIC package, while the AD7804BR-REEL is a quad 10-bit voltage-output DAC in a 16-lead SOIC package supplied on tape and reel. They differ in resolution, channel count, package, and interface configuration, so they are not functionally interchangeable.
Do the AD7801BRZ and AD7804BR-REEL use the same digital interface?
Both devices use a parallel digital interface, but the AD7801BRZ is an 8-bit single-channel DAC with an 8-bit parallel input, whereas the AD7804BR-REEL is a 10-bit quad DAC with a 10-bit parallel input and channel address decoding. The interface timing and control signals must be verified against each respective datasheet before reuse in a design.
Are the AD7801BRZ and AD7804BR-REEL pin-compatible?
No. The AD7801BRZ is housed in an 8-lead SOIC package, and the AD7804BR-REEL is housed in a 16-lead SOIC package. The pin counts, pin functions, and PCB land patterns differ, so they cannot be dropped into the same footprint.
What is the resolution and channel count of each device?
The AD7801BRZ provides 8-bit resolution with one voltage-output DAC channel. The AD7804BR-REEL provides 10-bit resolution with four voltage-output DAC channels. Designs requiring higher resolution or multiple channels must account for these differences.
Can the AD7801BRZ be used as a substitute for the AD7804BR-REEL in an existing design?
No direct substitution is possible. The AD7801BRZ has fewer channels (one versus four), lower resolution (8-bit versus 10-bit), a different package (8-lead versus 16-lead SOIC), and a different interface width. Any replacement requires a full schematic, layout, and firmware review against the manufacturer datasheets.
What supply voltage range do these DACs support?
Both the AD7801BRZ and AD7804BR-REEL are specified for operation from a single 2.7 V to 5.5 V supply, according to their respective manufacturer datasheets. The actual usable range and performance should be confirmed against the datasheet conditions for the target design.
How does the package and shipping format differ between the two parts?
The AD7801BRZ is supplied in an 8-lead SOIC package, while the AD7804BR-REEL is supplied in a 16-lead SOIC package on tape and reel for automated assembly. The reel packaging of the AD7804BR-REEL is suited to high-volume production, whereas the AD7801BRZ package format should be confirmed with the distributor for the specific order quantity.