ATMEGA16-16MJ - 16MHz 16KB Flash AVR MCU, 44-VQFN | Microchip
MPN: ATMEGA16-16MJ β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.8 | $5.80 |
| 10 | $5.22 | $52.20 |
| 100 | $4.64 | $464.00 |
| 500 | $4.18 | $2,090.00 |
| 1,000 | $3.72 | $3,720.00 |
ATMEGA16-16MJ Overview
A microcontroller is a single-chip computer that integrates a processor core, nonvolatile program memory, data RAM, and peripheral controllers on one die. Within the power-management-agnostic hierarchy of embedded silicon, the microcontroller sits below system-on-chip and above bare logic ICs; the AVR ATmega family is a classic 8-bit RISC microcontroller line widely used for cost-sensitive embedded control.
Key features of the ATMEGA16-16MJ include the advanced AVR RISC architecture with 131 powerful instructions, most executing in a single clock cycle, plus eight general-purpose working registers. The device integrates an 8-channel 10-bit ADC, a JTAG interface for on-chip debugging and boundary scan, and self-programming Flash enabling in-system field updates.
Technical depth: the Harvard-architecture core fetches instructions and data over separate buses, sustaining one MIPS per MHz of clock. On-chip peripherals include two 8-bit timers, one 16-bit timer with input capture and PWM output compare channels, a programmable serial USART, an SPI serial interface, and a two-wire (I2C-compatible) interface. Internal RC oscillator options and brown-out detection simplify clocking and supply supervision in compact boards; the exposed pad of the 44-VQFN improves thermal and ground performance.
Typical applications include industrial automation sensors and actuators, motor control and power-supply supervision panels, and embedded instrumentation requiring 10-bit analog acquisition. The industrial temperature range suits factory-floor electronics.
Design consideration: to run at the full 16 MHz speed grade the supply must be 4.5 V to 5.5 V; lower-voltage operation requires derating the clock frequency per the Microchip frequency-versus-voltage curve.
This page synthesizes distributor inventory data, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers one citation-ready reference.
Drop-in alternatives for ATMEGA16-16MJ 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 ATMEGA16-16MJ (same form factor and footprint) β differing in Flash Program Memory, Package, EEPROM, RoHS Status, Debug Interface.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA16-16AJ
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$2.1 / Unit
View Datasheet βATMEGA16A-MU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA16-16MU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA32-16MU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA8535L-8MI
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA16-16MJ Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Core Size | 8-bit |
| Maximum Clock Frequency | 16 MHz |
| Throughput | Up to 16 MIPS at 16 MHz |
| Flash Program Memory | 16 KB (8K x 16), self-programming |
| SRAM | 1 KB |
| EEPROM | 512 B |
| Instruction Set | 131 instructions, mostly single-cycle |
| ADC | 8-channel, 10-bit |
| Debug Interface | JTAG (on-chip debug and boundary scan) |
| Timers | Two 8-bit, one 16-bit |
| Communication Interfaces | USART, SPI, TWI (I2C-compatible) |
| Package | 44-VQFN (7x7 mm) exposed pad |
| Operating Temperature Range | -40C to +85C (industrial) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
ATMEGA16-16MJ 44-vqfn (7x7 mm) exposed pad Pin Configuration Guide
Pin configuration for ATMEGA16-16MJ (44-vqfn (7x7 mm) exposed pad 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 ATMEGA16-16MJ.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA16-16MJ is suitable for 6 applications: Industrial Automation Control Nodes, Sensor Acquisition Systems, Embedded Instrumentation and Test Rigs, Motor Control and PWM Drive Panels, Human-Machine Interface Panels, Power Supply and Battery Charger Supervision.
Industrial Automation Control Nodes
The ATMEGA16-16MJ fits factory automation nodes because its 16 MHz AVR core supplies 16 MIPS of deterministic single-cycle RISC throughput for scanning inputs and driving actuators, while the industrial -40C to +85C temperature rating matches cabinet electronics on the factory floor. The 16 KB self-programming Flash allows firmware field updates over the USART or TWI bus without removing the chip, an important serviceability feature in installed machinery. Four 8-bit GPIO ports give 32 I/O lines, enough for relay banks, limit switches, and status LEDs in one device, and the 16-bit timer with PWM channels handles simple actuator positioning. Placed on a 5 V industrial rail, the MLF-44 exposed-pad package grounds directly to the board pour, improving noise immunity near contactors and motor drivers.
Recommended
Sensor Acquisition Systems
Sensor front ends benefit directly from the ATMEGA16-16MJ integrated 8-channel 10-bit ADC, which multiplexes eight analog inputs such as thermistors, potentiometers, and pressure bridges without an external converter IC. At a 5 V reference the converter resolves roughly 4.9 mV per LSB, adequate for most process-monitoring tasks, while the 16 MHz core executes oversampling and averaging loops quickly thanks to single-cycle instructions. The 512 B EEPROM stores per-unit calibration constants that survive power cycles, and the TWI (I2C-compatible) interface lets the MCU log or forward readings to a display or supervisory controller. The JTAG on-chip debug interface shortens bring-up by allowing breakpoints during ADC ISR development. The MLF-44 exposed pad provides a low-impedance ground, reducing analog noise coupling in mixed-signal boards.
Recommended
Embedded Instrumentation and Test Rigs
Bench and production test fixtures use the ATMEGA16-16MJ because its JTAG interface enables true on-chip debugging and boundary-scan, letting engineers step through measurement sequences and inspect register state live during instrument validation. The 16 KB self-programming Flash supports test-sequence firmware swapping at the fixture without desoldering, and the USART provides a simple link to a host PC for logging. Timer PWM output-compare channels generate stimulus waveforms for exercising the device under test, while the 10-bit ADC reads response levels at roughly 4.9 mV resolution per 5 V of reference. The 44-MLF footprint keeps the controller small on dense fixture boards, and the industrial temperature rating tolerates unconditioned lab or line-side environments.
Recommended
Motor Control and PWM Drive Panels
The ATMEGA16-16MJ suits small motor drive panels through its 16-bit timer with input-capture and PWM output-compare channels, which generate and measure drive waveforms directly in hardware. The 16 MHz clock gives fine PWM resolution (about 16-bit period counts at lower duty-cycle frequencies) and fast interrupt latency for commutation or V/f control loops on DC and small permanent-magnet motors. The 10-bit ADC samples current-shunt or speed-potential feedback on one of eight channels, closing the loop in software while the core's single-cycle RISC instruction set keeps control math deterministic. On a 5 V rail with the MLF-44 exposed pad soldered to a generous ground pour, the device tolerates the electrically noisy environment near power stages and contactors.
Recommended
Human-Machine Interface Panels
Operator panels and small HMIs pair the ATMEGA16-16MJ with keypads, indicators, and character LCDs. Four 8-bit ports provide 32 GPIO, enough to drive a multiplexed display segment set and scan a 4x4 matrix keypad from a single 44-MLF device, while the single-cycle core refreshes displays and debounces keys without visible lag. The TWI interface can offload GPIO expansion or an RTC, and the USART streams status to a supervisory PLC or a PC. The 512 B EEPROM retains user-set thresholds and last mode through power loss, and the brown-out detector plus reset supervisor keep the panel from latching in corrupted states on brownouts. The 16 KB self-programming Flash allows menu-table and firmware updates in the field via the serial link.
Recommended
Power Supply and Battery Charger Supervision
Switching power supplies and chargers use the ATMEGA16-16MJ as a supervisory and telemetry controller: the 10-bit ADC reads output voltage, current shunt, and temperature on separate multiplexed channels, and software comparators implement constant-current/constant-voltage charging profiles with programmable thresholds. PWM timer channels can trim or gate the power stage through an optocoupler or drive a precharge relay, while the 16 MIPS core keeps the control loop timing tight. The 512 B EEPROM stores serialized calibration and fault logs, and the industrial temperature range covers -40C to +85C operation in sealed enclosures. Running at the full 16 MHz speed grade requires a 4.5 V to 5.5 V rail, which is conveniently the same rail the supply itself produces.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA16-16MJ β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA16-16AJ | ATMEGA16A-MU | ATMEGA32-16MU | ATMEGA8535L-8MI |
|---|---|---|---|---|---|
| Package | 44-VQFN (7x7 mm) MLF, exposed pad | 44-VQFN (7x7 mm) MLF - same | 44-VQFN (7x7 mm) MLF - same | 44-VQFN (7x7 mm) MLF - same | 44-VQFN (7x7 mm) MLF - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 8 MHz |
| Flash Program Memory | 16 KB | 16 KB | 16 KB | 32 KB | 8 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 2 KB | 512 B |
| ADC | 8-channel, 10-bit | 8-channel, 10-bit | 8-channel, 10-bit | 8-channel, 10-bit | 8-channel, 10-bit |
| JTAG Debug | Yes | Yes | Yes | Yes | Yes |
| Pin Compatibility | Reference (44-MLF AVR pinout) | Pin-to-pin, same die | Pin-to-pin, A-refresh die | Pin-to-pin, memory upgrade | Pin-to-pin, lower speed grade |
Key Differentiators
- Full 16 MHz speed grade in MLF package (vs ATMEGA8535L-8MI)
- Same footprint with double memory available (vs ATMEGA32-16MU)
- JTAG on-chip debug included (vs ATMEGA168V-10MU)
Design Notes
Supply design must respect the frequency-versus-voltage derating curve in the ATmega16 datasheet: full 16 MHz operation requires 4.5 V to 5.5 V VCC. If your board must also run at 3.3 V, reduce the clock to the derated limit or select an L-suffix family variant instead. Place a 100 nF ceramic decoupling capacitor at each VCC/AVCC pin pair, as close to the pads as possible, plus bulk capacitance at the board entry. AVCC should be tied to VCC through an LC filter when the ADC is used, keeping digital switching current out of the converter reference.
The 44-VQFN (7x7 mm) MLF package has its ground return on the exposed die pad underneath the body. Solder this pad to a solid ground pour using an array of small vias (typically 4 to 9) to evacuate heat and minimize ground bounce; an unsoldered pad commonly causes intermittent resets and ADC noise. MLF perimeter pads sit under the body edge, so specify a non-solder-mask-defined (NSMD) footprint and review the datasheet land-pattern drawing before fabrication. Inspection after reflow is limited to side-view, so use X-ray or via-probe checks on first articles.
Three recurring pitfalls with this part: (1) the JTAG pins are shared with Port C - if firmware reuses those pins as GPIO, the JTAGEN fuse must be cleared or the pins will not function, and debugging is then lost; (2) EEPROM writes lose data if VCC collapses mid-write - enable the brown-out detector fuse and keep VCC valid during EEPROM operations; (3) the RESET pin has an internal pull-up but long or noisy reset traces on industrial boards still need an external 10k pull-up plus 100 nF capacitor for robust power-up. Verify all fuse settings against the datasheet register summary before production programming.
When using the 8-channel 10-bit ADC in noisy industrial environments, keep analog traces short, route them away from PWM and USART lines, and filter the AVCC supply. Consider averaging 4 to 16 samples per channel in software; the 16 MIPS core has ample headroom for this. For the XTAL pins, follow the datasheet crystal selection tables and place load capacitors within 5 mm of the pins; internal RC oscillator options avoid the crystal entirely at the cost of frequency accuracy, which matters for USART baud-rate tolerance on long links.
Compliance Information
Distributor data (Full-Electronic) lists ROHS3 Compliant status for this part. Other compliance fields not stated in provided data.
