Part A
ADUC812BS
Dispositivos analógicos
- Lifecycle
- Active
- Stock
- 2004 PCS
- Series
- Embedidos - Microcontroladores
Replacement verdict
Compatible functional replacement candidate
The ADUC812BSZ and ADUC812BS are functionally equivalent MicroConverter ICs sharing the same core, memory architecture, and peripheral set; the BSZ suffix denotes RoHS-compliant lead-free packaging versus the leaded BS variant, making the BSZ a suitable functional replacement candidate where lead-free compliance is required, subject to final validation of solderability and assembly process compatibility.
Core and Memory Architecture
High match
Peripheral Set
High match
Package Type
High match
RoHS Compliance
Validation required
Parts at a glance
Part B
ADUC812BSZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6918 PCS
- Package
- QFP-52
- Series
- Embedidos - Microcontroladores
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADUC812BSZ | ADUC812BS | Why it matters |
|---|---|---|---|
| Manufacturer Part Number | ADUC812BSZ | ADUC812BS | The suffix "Z" denotes RoHS-compliant lead-free packaging, while the non-Z version may contain lead, affecting regulatory compliance and solderability. |
| RoHS Compliance | RoHS Compliant (lead-free) | Non-RoHS (contains lead) | RoHS compliance is mandatory for products sold in the EU and many other markets; a non-compliant part cannot be used in regulated designs. |
| Package / Case | 52-pin MQFP (Metric Quad Flat Package) | 52-pin MQFP (Metric Quad Flat Package) | Both use the same footprint, so PCB layout is interchangeable, but the lead finish differs between the two variants. |
| Lead Finish | Matte Tin (lead-free) | Tin-Lead (SnPb) | Lead finish affects solder process compatibility, whisker risk, and compliance with lead-free manufacturing requirements. |
| Core | 8051-compatible (8-bit) | 8051-compatible (8-bit) | Identical CPU core ensures the same instruction set and firmware compatibility for both parts. |
| Program Memory | 8 kB Flash | 8 kB Flash | Same on-chip program memory means identical code capacity and no firmware changes needed. |
| RAM | 256 B + 640 B internal XRAM | 256 B + 640 B internal XRAM | Identical data memory supports the same application runtime behavior. |
| ADC Resolution / Channels | 12-bit, 8-channel ADC | 12-bit, 8-channel ADC | Same analog-to-digital conversion capability ensures equivalent signal acquisition performance. |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Identical operating voltage range allows the same power supply design for either part. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range ensures equivalent environmental robustness. |
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 | ADUC812BS | ADUC812BSZ |
|---|---|---|
| Brand | Analog Devices | - |
| Product Type | 8-bit Microcontrollers - MCU | - |
| Subcategory | Microcontrollers - MCU | - |
| Minimum Operating Temperature | - 40 C | - |
| Maximum Operating Temperature | + 85 C | - |
| Core | 8052 | - |
| Program Memory Size | 8 kB | 8KB (8K x 8) |
| Data RAM Size | 256 B | - |
| ADC Resolution | 12 bit | - |
| Number of I/O | 34 I/O | 34 |
| Supply Voltage - Min | 2.7 V, 4.5 V | - |
| Supply Voltage - Max | 3.3 V, 5.5 V | - |
| Mounting Type | SMD/SMT | Surface Mount |
| Data Bus Width | 8 bit | - |
| Series | ADUC812 | MicroConverter® ADuC8xx |
| Interface Type | SPI, UART | - |
| Number of ADC Channels | 8 Channel | - |
| Number of Timers / Counters | 3 Timer | - |
| Program Memory Type | Flash | FLASH |
| Data RAM Type | SRAM | - |
| Product | MCUs | - |
| DAC Resolution | 12 bit | - |
| Watchdog Timers | Watchdog Timer | - |
| Processor Series | ADUC812 | - |
| Development Kit | EVAL-ADuC812QSZ | - |
| Part Status | - | Active |
| Core Processor | - | 8052 |
| Core Size | - | 8-Bit |
| Speed | - | 16MHz |
| Connectivity | - | I²C, SPI, UART/USART |
| Peripherals | - | PSM, Temp Sensor, WDT |
| EEPROM Size | - | 640 x 8 |
| RAM Size | - | 256 x 8 |
| Voltage - Supply (Vcc/Vdd) | - | 2.7V ~ 5.5V |
| Data Converters | - | A/D 8x12b; D/A 2x12b |
| Oscillator Type | - | Internal |
| Operating Temperature | - | -40°C ~ 85°C (TA) |
Frequently asked questions
What is the difference between ADUC812BSZ and ADUC812BS?
The ADUC812BSZ and ADUC812BS are both Analog Devices MicroConverter 12-bit ADC with embedded 8-bit MCU devices in a 52-lead MQFP package. The "Z" suffix in ADUC812BSZ denotes RoHS-compliant lead-free construction, while ADUC812BS is the non-RoHS (leaded) version. Functionally and electrically they are equivalent; the difference is environmental compliance and lead finish.
Are ADUC812BSZ and ADUC812BS functionally interchangeable?
Yes. Both parts share the same core, memory, ADC/DAC, and peripheral specifications per the Analog Devices ADUC812 datasheet. The only documented distinction is the RoHS/lead-free status indicated by the "Z" suffix. Designers should confirm the lead finish and solder process compatibility for their assembly.
What are the key specifications of the ADUC812?
The ADUC812 is an 8051-core MicroConverter with 8-channel 12-bit ADC, two 12-bit DACs, 8 KB flash/EE program memory, 640 bytes flash/EE data memory, 256 bytes RAM, UART, SPI, I2C, and three 16-bit timers, operating from 2.7 V to 5.5 V. These parameters are documented in the Analog Devices ADUC812 datasheet.
Does the "Z" suffix affect electrical performance?
No. The "Z" suffix in Analog Devices part numbering indicates RoHS compliance and lead-free termination finish. It does not change the electrical, timing, or functional specifications of the device as defined in the ADUC812 datasheet.
What package do ADUC812BSZ and ADUC812BS use?
Both devices are supplied in the 52-lead MQFP (Metric Quad Flat Package) as indicated by the "BS" code in the part number. Package outline and pinout are identical between the two variants per Analog Devices documentation.
Can ADUC812BS be replaced by ADUC812BSZ in an existing design?
Yes, provided the assembly process supports lead-free (RoHS) soldering. The ADUC812BSZ is the RoHS-compliant equivalent of the ADUC812BS with the same pinout and function. Verify solder profile and moisture sensitivity level against the manufacturer datasheet before substitution.
Which part should be selected for a new RoHS-compliant design?
ADUC812BSZ should be selected for new designs requiring RoHS compliance, as it is the lead-free variant. ADUC812BS is the non-RoHS version and is generally not preferred for new designs subject to RoHS directives.