ATMEGA8535L-8JU - AVR 8-bit MCU 8KB Flash 8MHz 44-PLCC | Microchip
MPN: ATMEGA8535L-8JU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.21 | $2.21 |
| 10 | $2.1 | $21.00 |
| 100 | $1.98 | $198.00 |
| 500 | $1.85 | $925.00 |
| 1,000 | $1.72 | $1,720.00 |
ATMEGA8535L-8JU Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals on one die. The ATmega8535 belongs to the AVR ATmega family, which sits within the broader microcontroller hierarchy: MCU -> embedded processor -> integrated circuit -> semiconductor. AVR's Harvard architecture with 130 mostly single-cycle instructions delivers up to 16 MIPS at 16 MHz, giving roughly 1 MIPS per MHz efficiency.
Key features include 8KB (4K x 16) self-programmable Flash, 512 bytes of in-system EEPROM, an 8-channel 10-bit successive-approximation ADC, 32 programmable I/O lines, two 8-bit and one 16-bit timers with PWM, a programmable serial USART, and an on-chip analog comparator. The 'L' speed grade and GREEN designation support low-power, lead-free designs.
Technically, the AVR enhanced RISC core executes most instructions in one clock cycle through a two-stage pipeline, while 32 general-purpose registers are directly connected to the ALU. Six sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby) let designers cut quiescent draw in battery-powered systems.
Typical applications include industrial control panels, ADC-based sensor acquisition nodes, motor and lighting control boards, and legacy PLCC-footprint AVR designs needing a second source. The 44-PLCC package suits socketed production and prototype environments.
Design consideration: the 'L' grade limits clocking to 8 MHz; above that, choose ATMEGA8535-16Jx variants. Ensure 4.5-5.5V supply since this is not the 2.7V-capable low-voltage option across all conditions.
This page synthesizes distributor pricing, drop-in alternatives, pin guidance, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for ATMEGA8535L-8JU β 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 ATMEGA8535L-8JU (same form factor and footprint) β differing in Timers, Package, Communication Interfaces, Core Architecture, Instructions.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA8535L-8AJ
β Drop-Inβ In Stock
$2.7 / Unit
View Datasheet βATMEGA8535L-8JC
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA8535-16JI
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA8535-16JC
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA8515-16JI
β Drop-Inβ In Stock
$5.44 / Unit
View Datasheet βATMEGA8535L-8JU Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR enhanced RISC, 8-bit |
| Flash Program Memory | 8 KB (4K x 16) |
| SRAM | 512 B |
| EEPROM | 512 B |
| Maximum Clock Speed | 8 MHz (L speed grade) |
| Throughput | 16 MIPS at 16 MHz (device family max) |
| Supply Voltage | 4.5 V to 5.5 V |
| ADC | 8-channel, 10-bit |
| Programmable I/O Lines | 32 |
| Timers | Two 8-bit, one 16-bit with PWM |
| Serial Interfaces | USART, SPI |
| Instructions | 130 powerful instructions, mostly single-cycle |
| Sleep Modes | 6 (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby) |
| Package | 44-PLCC (J-lead), 16.6 x 16.6 mm |
| Temperature Range | Industrial |
| Mounting Type | Surface Mount |
| Environmental | GREEN (lead-free per Mouser listing) |
| RoHS Status | Compliant (GREEN designation) |
| Lifecycle Status | Active |
ATMEGA8535L-8JU 44-plcc (j-lead), 16.6 x 16.6 mm Pin Configuration Guide
Pin configuration for ATMEGA8535L-8JU (44-plcc (j-lead), 16.6 x 16.6 mm 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 ATMEGA8535L-8JU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA8535L-8JU is suitable for 6 applications: Industrial Control Panels, Analog Sensor Acquisition Nodes, Motor and Lighting Control, Legacy PLCC AVR System Maintenance, Battery-Powered Instrumentation, Educational and Embedded Training Platforms.
Industrial Control Panels
The ATMEGA8535L-8JU fits industrial control panels that need deterministic 8-bit control, 32 programmable I/O lines, and robust 5V noise immunity. Its industrial temperature rating and AVR RISC core with 130 mostly single-cycle instructions provide predictable timing for relay sequencing, keypad scanning, and status indication. The on-chip 8-channel 10-bit ADC reads analog setpoints (potentiometers, 4-20mA-conditioned signals via external conditioning) without an external converter, while the USART links to HMIs or SCADA gateways. Running at 8 MHz at 5V gives high CMOS noise margins in electrically harsh cabinets, and Power-down sleep keeps standby current low between control cycles.
Recommended
Analog Sensor Acquisition Nodes
With an 8-channel 10-bit successive-approximation ADC, the ATMEGA8535L-8JU directly digitizes up to eight analog sensors - temperature, humidity, pressure bridges, or voltage dividers - at roughly 4.9 mV/LSB resolution on a 5V reference. The dedicated ADC Noise Reduction sleep mode stops the CPU clock during conversions, cutting digital noise and improving effective ADC accuracy, a distinct benefit over MCUs without this mode. The 512B EEPROM stores calibration constants across power cycles, and the USART streams results to logging hardware. The 44-PLCC socket-compatible package simplifies field calibration swaps in prototype or low-volume instrumentation.
Recommended
Motor and Lighting Control
The ATMEGA8535L-8JU provides two 8-bit timers and one 16-bit timer with PWM outputs, enabling multi-channel PWM generation for DC motor speed control, LED dimming, and small inverter stages. At 8 MHz, an 8-bit PWM resolution yields about 31 kHz carrier frequency, above audible range, while the 16-bit timer supports slow, precise servo or heater PWM periods. Four PWM-capable channels from the timer units plus 32 I/O lines cover direction logic, enable signals, and fault inputs. The 5V industrial supply and PLCC package tolerate cabinet temperatures and vibration better than small-pitch QFP alternatives in cost-driven equipment.
Recommended
Legacy PLCC AVR System Maintenance
Many installed AT90S8535 and early ATmega8535 designs used socketed 44-PLCC packages, and the ATMEGA8535L-8JU is the natural in-system repair part: per Microchip documentation, the ATmega8535 is the upgrade/compatible successor to the AT90S8535 in the same footprint. Socketed PLCC allows technicians to reprogram or swap Flash devices in the field without hot-air rework, an advantage over soldered TQFP parts. The 8KB Flash accommodates accumulated legacy firmware with ISP (in-system programming) support, and 512B EEPROM preserves configuration. Stock availability (18,000+ pieces at Heisener as of 2026-09-19) supports repair-stock provisioning.
Recommended
Battery-Powered Instrumentation
Although this is a 5V industrial part, the ATmega8535 architecture suits battery instruments that can tolerate a 4.5-5.5V rail (e.g., four NiMH cells or a boost converter). Six sleep modes - Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby per Microchip datasheet doc2502 - allow the firmware to cut core current dramatically between measurement bursts. The 16-bit timer with Power-save mode can act as an asynchronous wake source, and the 512B EEPROM logs configuration and calibration without external nonvolatile memory. Designers should trade the 8 MHz limit against duty-cycling: lower clocking plus sleep dominates average current.
Recommended
Educational and Embedded Training Platforms
The ATmega8535 remains popular in university embedded-systems labs because the AVR core exposes architecture concepts clearly: 32 registers, single-cycle execution, Harvard memory, and simple ISP flashing. The 44-PLCC socketed package lets students remove and reprogram devices on breadboard-compatible carrier boards without SMT equipment. The rich peripheral set - 8-channel 10-bit ADC, USART, SPI, three timers with PWM, analog comparator - supports progressive coursework from blinking LEDs to closed-loop ADC control within one chip. Availability under $2.50 per unit (LCSC, as of 2026-09-19) keeps per-station costs low for volume lab purchases.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA8535L-8JU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA8535L-8AJ | ATMEGA8535L-8JC | ATMEGA8535-16JI | ATMEGA8515-16JI |
|---|---|---|---|---|---|
| Package | 44-PLCC (J-lead), 16.6x16.6 mm | 44-PLCC (J-lead) - same | 44-PLCC (J-lead) - same | 44-PLCC (J-lead) - same | 44-PLCC (J-lead) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 8 MHz | 8 MHz | 8 MHz | 16 MHz | 16 MHz |
| Flash Memory | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| ADC | 8-channel, 10-bit | 8-channel, 10-bit | 8-channel, 10-bit | 8-channel, 10-bit | None |
| 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 |
| Temperature Range | Industrial (-40C to +85C) | Industrial - same | Commercial (0C to +70C) | Industrial - same | Industrial - same |
| EEPROM | 512 B | 512 B | 512 B | 512 B | 512 B |
Key Differentiators
- Lowest-cost L speed grade with ADC (vs ATMEGA8535-16JI)
- Industrial temperature rating (vs ATMEGA8535L-8JC)
- Integrated 8-channel 10-bit ADC (vs ATMEGA8515-16JI)
Design Notes
Decouple both VCC pins and AVCC with 100 nF ceramic capacitors placed within 5 mm of the package pins, plus a 4.7-10 uF bulk capacitor near the PLCC supply entry. AVCC must be connected to VCC even if the ADC is unused, per Microchip datasheet doc2502; for ADC use, feed AVCC through an LC filter (10 uH + 100 nF) to isolate converter noise from digital supply ripple. Keep the 5V rail within 4.5-5.5 V; brown-out detector fuse settings protect EEPROM writes during supply sag.
The 44-PLCC J-lead package is socket-compatible but its leads add roughly 1-2 nH of parasitic inductance versus a QFN; keep crystal traces short (XTAL1/XTAL2 close to the package with 20 pF loading capacitors per datasheet clock section) and route the ADC reference (AREF) away from switching nets. If using a PLCC socket, verify contact resistance over temperature - oxidized contacts are a classic field-failure mode in industrial environments. Provide via-stitched ground pour under the package.
Do not clock the '-8JU' above 8 MHz: the 'L' speed grade is limited to 0-8 MHz per datasheet doc2502, and overclocking causes marginal instruction timing not covered by specification. Also, PLCC pin numbering winds counterclockwise around the package with pin 1 at the top-center-indexed corner - transferring a QFP-44 pin map to a PLCC footprint is a frequent layout error. Finally, remember this part is not the low-voltage grade across all ordering options: design for a true 5V rail, not 3.3V.
Compliance Information
DigiKey and Mouser list the part as RoHS compliant with Microchip's GREEN designation (lead-free); Mouser listing states 'IND TEMP GREEN'. REACH, halogen-free, and conflict-minerals statuses not stated in provided data.
