Part A
ADUC831BSZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2439 PCS
- Package
- MQFP-52
- Series
- Embedded - Microcontrollers
Replacement verdict
Compatible functional replacement candidate
The ADUC831BSZ and ADUC847BS32-3 are both MicroConverter 12-bit ADC MCUs from Analog Devices sharing the same 52-lead MQFP footprint and 8051-compatible core architecture, making the ADUC847BS32-3 a viable functional replacement candidate for the ADUC831BSZ in many designs. However, the ADUC847BS32-3 offers a higher maximum clock frequency, expanded on-chip Flash and SRAM, and an extended temperature range, while the ADUC831BSZ provides a wider analog input range and additional DAC channels. Designers should validate clock, memory, and analog front-end requirements against the target application before substituting.
Package Type
High match
Core Architecture
High match
On-Chip Memory
Validation required
Analog Input Range
Validation required
Parts at a glance
Part B
ADUC847BS32-3
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3529 PCS
- Package
- QFP-52
- Series
- Embedded - Microcontrollers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADUC831BSZ | ADUC847BS32-3 | Why it matters |
|---|---|---|---|
| Core Architecture | 8052 (8-bit) | 8052 (8-bit) | Both use the same 8052 core, so instruction set and toolchain compatibility are preserved for firmware reuse. |
| Program Memory (Flash) | 62 kB | 32 kB | Flash size determines how much application code can be stored; a smaller flash may require code optimization or feature reduction. |
| Data Memory (RAM) | 2.25 kB | 2.25 kB | On-chip RAM affects stack depth and data buffering; identical RAM eases porting of existing applications. |
| ADC Resolution | 12-bit | 24-bit (Sigma-Delta) | ADC resolution directly impacts measurement precision; the 24-bit sigma-delta ADC enables high-accuracy sensor and instrumentation applications not achievable with 12-bit. |
| Number of ADC Channels | 8 (single-ended) / 4 (differential) | 10 (single-ended) / 5 (differential) | Channel count determines how many analog signals can be sampled; more channels allow more sensors without external multiplexing. |
| DAC | Dual 12-bit DAC | Dual 16-bit DAC | DAC resolution affects analog output precision; 16-bit DACs provide finer control for control-loop and waveform generation applications. |
| Maximum Clock Frequency | 16 MHz | 12.58 MHz | Clock speed affects instruction throughput and timing margins; a lower maximum clock may require re-tuning timing-critical code. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Compatible supply ranges allow the same power rail design to be reused across both parts. |
| Package | 52-lead MQFP | 52-lead MQFP | Identical package and pin count simplify PCB layout reuse, though pinout differences must still be verified. |
| 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. |
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 | ADUC831BSZ | ADUC847BS32-3 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | MicroConverter® ADuC8xx | MicroConverter® ADuC8xx |
| Part Status | Active | Obsolete |
| Core Processor | 8052 | 8052 |
| Core Size | 8-Bit | 8-Bit |
| Speed | 16MHz | 12.58MHz |
| Connectivity | EBI/EMI, I²C, SPI, UART/USART | I²C, SPI, UART/USART |
| Peripherals | PSM, Temp Sensor, WDT | POR, PSM, PWM, Temp Sensor, WDT |
| Number of I/O | 34 | 34 |
| Program Memory Size | 62KB (62K x 8) | 32KB (32K x 8) |
| Program Memory Type | FLASH | FLASH |
| EEPROM Size | 4K x 8 | 4K x 8 |
| RAM Size | 2.25K x 8 | 2.25K x 8 |
| Voltage - Supply (Vcc/Vdd) | 2.7V ~ 5.5V | 2.7V ~ 3.6V |
| Data Converters | A/D 8x12b; D/A 2x12b | A/D 10x24b; D/A 1x12b, 2x16b |
| Oscillator Type | Internal | Internal |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the core architectural differences between the ADUC831BSZ and the ADUC847BS32-3?
The ADUC831BSZ is a MicroConverter® integrating a 12-bit ADC and a 12-bit DAC with an 8052 MCU core, while the ADUC847BS32-3 is a MicroConverter® featuring a 24-bit sigma-delta ADC and a 12-bit DAC with an 8052 MCU core. The ADUC831BSZ targets general-purpose 12-bit signal acquisition, whereas the ADUC847BS32-3 targets high-resolution, low-frequency measurement applications.
How do the ADC specifications compare between the ADUC831BSZ and the ADUC847BS32-3?
The ADUC831BSZ provides a 12-bit successive-approximation ADC with up to 8 input channels and a throughput rate of 247 kSPS. The ADUC847BS32-3 provides a 24-bit sigma-delta ADC with up to 10 input channels and programmable output update rates up to 1.365 kSPS. The ADUC847BS32-3 offers significantly higher resolution at the expense of conversion speed.
Do the ADUC831BSZ and ADUC847BS32-3 have the same on-chip memory configuration?
No. The ADUC831BSZ includes 62 kB of on-chip Flash/EE program memory and 2 kB of on-chip data RAM. The ADUC847BS32-3 includes 32 kB of on-chip Flash/EE program memory and 2.25 kB of on-chip data RAM. The ADUC831BSZ provides more program memory, while the ADUC847BS32-3 provides slightly more data RAM.
Are the ADUC831BSZ and ADUC847BS32-3 available in the same package type?
Both devices are offered in a 52-lead MQFP package. The ADUC831BSZ suffix indicates the 52-lead MQFP package, and the ADUC847BS32-3 is also specified in a 52-lead MQFP package. However, pin functions and external connections differ between the two devices, so PCB layouts are not interchangeable without verification.
What are the supply voltage and operating temperature ranges for these two parts?
The ADUC831BSZ operates from a 3 V or 5 V supply and is specified over the industrial temperature range of −40°C to +85°C. The ADUC847BS32-3 operates from a 3 V supply and is also specified over the industrial temperature range of −40°C to +85°C. The ADUC831BSZ supports both 3 V and 5 V operation, while the ADUC847BS32-3 is a 3 V device.
Can the ADUC831BSZ be used as a drop-in replacement for the ADUC847BS32-3?
No. Although both are 8052-core MicroConverters® in 52-lead MQFP packages, they differ in ADC architecture (12-bit SAR versus 24-bit sigma-delta), program memory size (62 kB versus 32 kB), supply voltage options, and pin functions. A direct drop-in replacement is not supported; any substitution requires full schematic, layout, and firmware validation against the respective datasheets.
Which device is better suited for high-resolution sensor measurement applications?
The ADUC847BS32-3 is better suited for high-resolution sensor measurement because its 24-bit sigma-delta ADC provides significantly finer resolution and lower noise for low-frequency signals. The ADUC831BSZ, with its 12-bit SAR ADC and higher throughput, is better suited for faster, general-purpose signal acquisition where 12-bit resolution is sufficient.
Do both devices include an on-chip 12-bit DAC and UART serial interface?
Yes. Both the ADUC831BSZ and the ADUC847BS32-3 integrate a 12-bit voltage-output DAC and an on-chip UART serial interface, along with the 8052 MCU core. These shared peripherals support serial communication and analog output in both parts, though the surrounding ADC and memory resources differ.