ATMEGA8535-16JUR - 8KB Flash 16MHz AVR MCU 44-PLCC | Microchip
MPN: ATMEGA8535-16JUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.77 | $3.77 |
| 10 | $3.45 | $34.50 |
| 100 | $3.15 | $315.00 |
| 500 | $2.9 | $1,450.00 |
| 1,000 | $2.65 | $2,650.00 |
ATMEGA8535-16JUR Overview
An 8-bit microcontroller (MCU) is a self-contained computing device that integrates a processor core, program memory, data memory, and peripherals on a single silicon die. Within the embedded-systems hierarchy, the ATMEGA8535 belongs to the AVR ATmega family of flash-based MCUs, which sit under the broader categories of microcontrollers, embedded processors, and semiconductor integrated circuits. AVRs are known for their advanced RISC architecture with mostly single-cycle instruction execution.
Key features include the advanced RISC architecture with 130 powerful instructions, most executed in a single clock cycle; 32 x 8-bit general-purpose working registers; 8-channel 10-bit ADC; full-duplex UART; SPI serial interface; and multiple PWM channels. These peripherals make the device well suited to analog sensing and motor-adjacent control tasks without external components.
Technically, the ATmega8535 uses the AVR Harvard architecture with separate program and data buses, enabling single-cycle fetch of most instructions. The 16MHz speed grade (-16 suffix) permits 16 MIPS peak throughput at 5V operation. In-system programmable (ISP) Flash allows field firmware updates via the SPI interface, and the on-chip EEPROM retains calibration data through power cycles.
Typical applications include industrial control boards, 5V legacy equipment maintenance, data-acquisition front ends using the 8-channel ADC, and educational or hobby embedded platforms. The 5V-only supply range aligns with industrial 5V logic rails, and the PLCC package supports J-lead socketed designs for easy field replacement.
A key design consideration is power dissipation: at 16MHz and 5V the device consumes more current than lower speed grades, so active-mode current budgeting and proper VCC/GND decoupling (100nF ceramic per supply pin pair) are recommended. Because the PLCC footprint differs from TQFP, footprint changes are required when migrating to TQFP variants such as ATMEGA8535-16AU.
This page synthesizes distributor pricing, drop-in alternative analysis, and practical design notes not found in the manufacturer datasheet, giving engineers and buyers a single verified reference for the ATMEGA8535-16JUR.
Drop-in alternatives for ATMEGA8535-16JUR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA8535-16JUR (same form factor and footprint) — differing in EEPROM, Package, Core Architecture, External Memory Interface, Flash Program Memory.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA8535-16JU
✅ Drop-In✓ In Stock
$3.35 / Unit
View Datasheet →ATMEGA8535-16JI
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA8535-16JC
✅ Drop-In✓ In Stock
$3.25 / Unit
View Datasheet →ATMEGA8515-16JI
✅ Drop-In✓ In Stock
$5.44 / Unit
View Datasheet →ATMEGA8515-16JU
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →ATMEGA8535-16JUR Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Flash Program Memory | 8KB (4K x 16) |
| SRAM Data Memory | 544B |
| EEPROM | 512B |
| Maximum Clock Speed | 16 MHz |
| Peak Throughput | 16 MIPS at 16 MHz |
| Supply Voltage | 4.5 V to 5.5 V |
| ADC | 8-channel, 10-bit |
| GPIO Count | 32 |
| Package | 44-PLCC (16.6 x 16.6 mm), J-Lead |
| Mounting Type | Surface Mount |
| Series | AVR ATmega |
| Instruction Count | 130 instructions |
| Programmability | In-System Programmable (ISP) via SPI |
| Life Cycle Stage | ACTIVE |
ATMEGA8535-16JUR 44-plcc (16.6 x 16.6 mm), j-lead Pin Configuration Guide
Pin configuration for ATMEGA8535-16JUR (44-plcc (16.6 x 16.6 mm), j-lead package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATMEGA8535-16JUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA8535-16JUR is suitable for 6 applications: Industrial Control Systems, Multi-Channel Data Acquisition, Legacy Equipment Maintenance and Repair, Motor Control and PWM Applications, Educational and Prototyping Platforms, Instrumentation and Sensor Interfaces.
Industrial Control Systems
The ATMEGA8535-16JUR fits 5V industrial control boards because its 4.5V to 5.5V supply range connects directly to standard industrial 5V rails without regulators or level shifters, and its 32 GPIO lines drive relays, indicators and optocoupler inputs. The 16MHz clock provides 16 MIPS for deterministic control loops, while UART and SPI support Modbus-style serial links and peripheral expansion. The industrial temperature variant ATMEGA8535-16JI is available in the identical PLCC-44 footprint when the enclosure sees harsh temperatures, letting one PCB design serve both office-floor and plant-floor deployments with only a BOM change.
Recommended
Multi-Channel Data Acquisition
The integrated 8-channel, 10-bit ADC is the core reason to select the ATMEGA8535-16JUR for data-acquisition front ends: eight analog inputs (temperature, pressure, voltage monitoring) are sampled without an external converter, reducing BOM cost and board area. Placed in a sensor aggregation node, the MCU samples channels sequentially at kilohertz rates, applies averaging in the 544B of SRAM, and streams results over the UART. Because conversion accuracy depends on supply quality, use a clean AVCC rail with dedicated decoupling; the ADC reference can be taken from AVCC for ratiometric measurements against the same supply.
Recommended
Legacy Equipment Maintenance and Repair
Many 1990s and 2000s industrial and consumer products were designed around the ATmega8535 in socketed PLCC-44 packages, making the ATMEGA8535-16JUR a natural service spare. The J-lead PLCC footprint mates with zero-insertion-force sockets, allowing board-level replacement with simple tools and no reflow equipment. Firmware can be re-extracted and re-flashed via the SPI ISP interface using legacy AVR programmers. Because Microchip lists the lifecycle stage as ACTIVE, repair shops can source new units rather than harvested parts, and drop-in siblings ATMEGA8535-16JU, -16JI and -16JC broaden sourcing options when exact stock is scarce.
Recommended
Motor Control and PWM Applications
The ATmega8535 provides multiple PWM outputs that, combined with the AVR's single-cycle instruction execution at 16MHz, support fan, DC motor and light-dimmer control with closed-loop feedback from the 10-bit ADC. A typical topology reads a speed or current sense signal on one ADC channel, executes a PI loop in firmware, and updates the PWM duty cycle each control period. The 5V I/O directly interfaces gate-driver inputs for small motors. Engineers should budget the 544B SRAM carefully, as full floating-point PID implementations plus communication buffers approach the on-chip data memory limit.
Recommended
Educational and Prototyping Platforms
The ATMEGA8535-16JUR is widely used in university embedded-systems courses because the AVR architecture is simple, fully documented, and supported by free C compilers, macro assemblers, debugger/simulators and evaluation kits per Microchip's documentation. The 130-instruction RISC set with mostly single-cycle execution is teachable at the assembly level, while the UART, SPI, ADC and timers cover a complete peripherals curriculum on one chip. The robust 44-PLCC package tolerates repeated handling on student boards, and ISP programming via a low-cost SPI dongle keeps per-station tooling expense minimal, making it practical for classroom-scale deployments.
Recommended
Instrumentation and Sensor Interfaces
Bench instruments and sensor hubs benefit from the ATMEGA8535-16JUR's combination of a 10-bit ADC, hardware UART for host communication, and SPI for external precision converters or displays when 10-bit resolution is insufficient. In a typical instrument front end, the MCU digitizes coarse signals internally, drives a character LCD or LED display via GPIO, and accepts calibration constants stored in the 512B EEPROM so each unit retains its calibration through power cycles. The 16MHz clock keeps command-response latency low for interactive instruments, and the 5V logic simplifies interfacing with legacy instrument backplanes and optocoupled isolation barriers.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA8535-16JUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA8535-16JU | ATMEGA8535-16JI | ATMEGA8515-16JI | ATMEGA8515-16JU |
|---|---|---|---|---|---|
| Package | 44-PLCC (16.6x16.6) | 44-PLCC (16.6x16.6) - same | 44-PLCC (16.6x16.6) - same | 44-PLCC (16.6x16.6) - same | 44-PLCC (16.6x16.6) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 8KB | 8KB | 8KB | 8KB | 8KB |
| ADC | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | None | None |
| Max Clock Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| External Memory Interface | No | No | No | Yes | Yes |
Key Differentiators
- Integrated 8-channel 10-bit ADC (vs ATMEGA8515-16JI)
- Active lifecycle with broad drop-in variants (vs ATMEGA8535-16JU)
- Trade-off: 544B SRAM limits complex firmware (vs ATMEGA644-20AU)
Design Notes
Estimated: at 16MHz and 5.0V the ATmega8535 active-mode current is on the order of 10-20 mA (confirm exact figure in the ATmega8535 datasheet active-supply-current table for the 16MHz, 5V condition), so a small linear regulator suffices. More important is supply quality for the 10-bit ADC: decouple VCC and AVCC separately with 100nF ceramic capacitors placed within 5mm of each pin, and connect AGND and GND at a single star point. Do not power the ADC reference from a rail shared with relay or LED drivers, or effective ADC resolution will drop below 10 bits.
The 44-PLCC J-lead package requires solder fillets on all four sides; use a land pattern per the PLCC-44 footprint in Microchip's ATmega8535 datasheet rather than a generic 0.8mm-pitch pattern, since J-leads need outward foot extension for reliable inspection. If the design may later migrate to the TQFP-44 ATMEGA8535-16AU, do NOT attempt a common footprint: PLCC and TQFP land patterns are incompatible. Reserve board area and plan a footprint revision instead. Leave probe-accessible test pads on RESET, MOSI, MISO and SCK for ISP reprogramming.
Three pitfalls recur with this device. First, the order-code suffix matters: 16JUR (tape and reel), 16JU, 16JI and 16JC differ in delivery format and temperature grade but share silicon - order the suffix your assembly line and environment require. Second, ATmega8515 is package-similar but has no ADC and a different pin function map, so it is not a firmware-compatible substitute despite the same PLCC-44 footprint. Third, verify ISP programmer support explicitly: some modern AVR programmers have dropped legacy ATmega8535 device profiles, which strands field-reprogramming plans.
Compliance Information
Verified web data snippets do not state RoHS/REACH/lead-free status for ATMEGA8535-16JUR. Not an automotive part; AEC-Q100 not applicable. Confirm compliance certificates on Microchip's official product page.
