ATMEGA8535-16JC - 8-bit AVR MCU 16MHz 8KB Flash | Microchip
MPN: ATMEGA8535-16JC ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.17 | $4.17 |
| 10 | $4 | $40.00 |
| 25 | $3.8 | $95.00 |
| 100 | $3.55 | $355.00 |
| 1,000 | $3.25 | $3,250.00 |
ATMEGA8535-16JC Overview
A microcontroller unit (MCU) is a single-chip computer integrating a processor core, program memory, data memory, and peripherals. The ATmega8535 belongs to the AVR 8-bit microcontroller family, itself a branch of the broader microcontroller and embedded processor hierarchy. AVR devices execute most of their 130 powerful instructions in a single clock cycle, giving high code density and fast deterministic execution for embedded control systems.
Key features include an advanced RISC architecture with 32 general-purpose working registers, full static operation from DC to 16 MHz, and 8-channel 10-bit analog-to-digital conversion - parameters that make the device well suited to mixed analog-digital control tasks. It also provides three flexible Timer/Counters with compare modes, a programmable serial USART, and a byte-oriented Two-Wire Serial Interface (TWI/I2C-compatible) for board-level communication.
Technically, the core uses a Harvard architecture with separate program and data buses, enabling Read-While-Write self-programming of the Flash. In-System Programming (ISP) permits firmware updates without removing the device from the PCB, while JTAG boundary-scan and on-chip debug support system integration. Internal and external interrupt sources support responsive real-time control.
Typical applications include industrial automation controllers, instrumentation with analog sensor front-ends leveraging the 10-bit ADC, and communication nodes using the USART and TWI interfaces.
Design consideration: the 16 MHz -16 speed grade operates at 4.5-5.5V; verify supply tolerance before choosing this grade over the 8 MHz low-voltage L variant.
This page synthesizes distributor pricing, drop-in alternatives, design notes, and FAQ answers not found in the manufacturer datasheet alone. Pricing references are as of 2026-09-19.
Drop-in alternatives for ATMEGA8535-16JC — 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 ATMEGA8535-16JC (same form factor and footprint) — differing in EEPROM, Package, ADC, Communication Interfaces, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA8515-16JC
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.85 / Unit
View Datasheet →ATMEGA8515-16JI
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.44 / Unit
View Datasheet →ATMEGA8535-16JI
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA8535-16JC Maximum Ratings & Electrical Characteristics
| Core | AVR 8-bit RISC |
| Clock Frequency | 16 MHz |
| Throughput | Up to 16 MIPS at 16 MHz |
| Flash Program Memory | 8 KB (4K x 16), In-System Programmable |
| SRAM | 544 bytes |
| EEPROM | 512 bytes |
| ADC | 8-channel 10-bit |
| Instructions | 130 instructions, most single-cycle |
| General Purpose Registers | 32 |
| Timers/Counters | 3 flexible Timer/Counters with compare modes |
| Communication Interfaces | USART, Two-Wire Serial Interface (TWI) |
| GPIO | 32 general purpose I/O lines |
| Package | 44-PLCC (16.6 x 16.6 mm), J-lead |
| Mounting Type | Surface Mount |
ATMEGA8535-16JC 44-plcc (16.6 x 16.6 mm), j-lead Pin Configuration Guide
Pin configuration for ATMEGA8535-16JC (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 ATMEGA8535-16JC.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA8535-16JC is suitable for 6 applications: Industrial Automation Controllers, Sensor Instrumentation with Analog Front-End, Embedded Communication Nodes, Motor Control and PWM Actuator Drive, Portable and Battery-Powered Devices, Legacy Embedded System Maintenance and Retrofit.
Industrial Automation Controllers
The ATMEGA8535-16JC fits industrial automation nodes that need deterministic 8-bit control with moderate analog input count. Its 16 MIPS at 16 MHz throughput handles relay sequencing, motor start/stop logic, and PID-style loops, while three Timer/Counters with compare modes generate PWM outputs for actuator drive without CPU overhead. The 32 GPIO lines map directly to 4x8-bit I/O banks typical of PLC expansion cards. Self-programming 8 KB Flash enables firmware field updates over the USART without desoldering, reducing maintenance cost in installed equipment. Because most AVR instructions execute in a single clock cycle, interrupt latency and loop timing remain predictable - a key benefit for machine-safety interlocks. Designers should budget the 544-byte SRAM carefully, as protocol stacks plus data buffers consume it quickly at this memory class.
Recommended
Sensor Instrumentation with Analog Front-End
Instrumentation designs measuring temperature, pressure, or voltage benefit directly from the ATMEGA8535-16JC's integrated 8-channel 10-bit ADC, which eliminates an external converter and its associated layout, cost, and noise concerns. Eight channels allow multi-point measurement arrays - for example, eight thermistor inputs or a differential pair plus reference channels - switched under firmware control. The 512-byte EEPROM stores per-unit calibration coefficients across power cycles, while the 16 MHz core supports oversampling and averaging algorithms to increase effective resolution beyond the native 10 bits. Typical topology: sensor divider networks feed the ADC pins, results are averaged in SRAM, and readings are exported via USART or TWI. Designers must keep analog traces away from the crystal and PWM lines and decouple AVCC per the Microchip datasheet recommendations.
Recommended
Embedded Communication Nodes
The ATMEGA8535-16JC serves as a low-cost communication gateway node using its hardware USART for RS-232/RS-485 links and its byte-oriented Two-Wire Serial Interface (TWI) for inter-board communication with sensors, EEPROMs, and RTCs. At 16 MHz, the USART sustains standard baud rates up to 115200 with a stable baud divider derived from the system clock, sufficient for telemetry and configuration traffic. The 544-byte SRAM accommodates modest buffering; the 512-byte EEPROM can hold node addresses and last-known-good settings. Typical deployment: an RS-485 transceiver on the USART side bridges to a plant network while the TWI bus polls local sensors, with the AVR performing protocol translation. Designers should implement bus turnaround timing in Timer interrupts to keep the node responsive on shared multidrop networks.
Recommended
Motor Control and PWM Actuator Drive
With three Timer/Counters offering compare modes, the ATMEGA8535-16JC generates multiple independent PWM channels for DC motor speed control, servo positioning, and heater or lamp dimming. At 16 MHz, 8-bit PWM frequencies in the tens-of-kilohertz range are achievable - above audible noise for motor drives - while the single-cycle RISC core runs the control loop concurrently. The 10-bit ADC closes the loop by reading back current-sense or tachometer signals, enabling proportional control in firmware. A typical stage pairs the PWM output with a MOSFET driver and power MOSFET for the load. Designers must respect the 544-byte SRAM limit when implementing state machines and filtering, and should place snubbers or freewheel diodes close to the switching stage to keep switching noise out of the AVR's ADC readings.
Recommended
Portable and Battery-Powered Devices
The ATMEGA8535-16JC's low-power CMOS process and fully static core - capable of operation down to DC - make it viable in battery-powered instruments where the clock can be slowed to cut consumption. The AVR architecture draws current roughly proportional to frequency, so running at 1-2 MHz for background tasks and using idle or power-down sleep modes between conversions extends battery life substantially compared to a continuously running 16 MHz design. The 8-channel ADC supports direct connection of battery-voltage and sensor dividers for self-monitoring, and the USART/TWI wake on activity supports intermittently powered telemetry. Design consideration: the -16 grade targets 5V systems; low-voltage battery designs (3V-class cells) should instead evaluate the ATmega8535L low-voltage variant, which trades maximum clock speed for a wider, lower supply range.
Recommended
Legacy Embedded System Maintenance and Retrofit
Many installed industrial and consumer products were designed around the ATmega8535, and the ATMEGA8535-16JC remains the standard service part for repairing and retrofitting these systems. Because the device supports In-System Programming with Read-While-Write Flash, service technicians can reflash updated firmware in-place using the standard SPI ISP header, without desoldering the PLCC. The 44-PLCC socketed format common in legacy boards further simplifies replacement. When exact -16JC commercial-grade stock is tight, the industrial ATMEGA8535-16JI is pin- and firmware-identical and can be substituted after confirming the wider temperature grade is acceptable. Repair depots should verify code compatibility if considering the ATMEGA8515, whose reduced peripheral set does not use the 8535's ADC or TWI registers.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA8535-16JC — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA8515-16JC | ATMEGA8515-16JI | ATMEGA8535-16JI |
|---|---|---|---|---|
| Package | 44-PLCC (16.6 x 16.6 mm) | 44-PLCC (16.6 x 16.6 mm) - same | 44-PLCC (16.6 x 16.6 mm) - same | 44-PLCC (16.6 x 16.6 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Clock | AVR 8-bit, 16 MHz | AVR 8-bit, 16 MHz | AVR 8-bit, 16 MHz | AVR 8-bit, 16 MHz |
| Flash | 8 KB ISP | 8 KB ISP | 8 KB ISP | 8 KB ISP |
| SRAM | 544 bytes | 512 bytes | 512 bytes | 544 bytes |
| Peripherals | 3 timers, USART, TWI, 10-bit ADC | 3 timers, USART, SPI (reduced set) | 3 timers, USART, SPI (reduced set) | 3 timers, USART, TWI, 10-bit ADC - identical |
Key Differentiators
- Integrated 8-channel 10-bit ADC (vs ATMEGA8515-16JC)
- Larger SRAM for buffers (vs ATMEGA8515-16JC)
- Temperature grade flexibility within the same footprint (vs ATMEGA8535-16JI)
Design Notes
The -16 speed grade targets higher supply operation than the L variants - verify the operating voltage range in the Microchip datasheet (document 2502S) against your 5V rail before design freeze. Decouple VCC and AVCC independently with 100 nF ceramics placed within a few millimeters of each pin pair, plus bulk 10 uF per board. Connect AVCC to VCC through a low-pass RC filter when ADC accuracy matters; Analog Ground and Digital Ground should meet at a single star point beneath the chip.
The 44-PLCC J-lead package is socket-friendly: use a quality PLCC socket for serviceable designs, but note sockets add inductance and are discouraged above roughly 8-16 MHz clock rates in noisy environments. Keep the crystal within 10-15 mm of the XTAL pins with 20-30 pF load capacitors and a ground guard ring. Route the 8 ADC channel traces as a quiet analog group on a separate area of the board, away from PWM, USART, and crystal signals.
The 544-byte SRAM is the most common cause of field failures in migrated designs - firmware originally written for larger megaAVR parts can silently corrupt stack and heap. Enable stack overflow checks in development. When substituting ATMEGA8515 for the 8535, remember register maps for the ADC and TWI differ; code will not port unchanged. Finally, EEPROM endurance is finite: implement wear-leveling for frequently updated calibration data rather than writing on every power cycle.
Compliance Information
Compliance data was not explicitly provided in the retrieved web data. Verify RoHS/REACH status on the official Microchip product page for ATmega8535 before procurement.
