ATTINY816-SNR - 8-bit AVR MCU 20MHz 8KB Flash 20-SOIC | Microchip
MPN: ATTINY816-SNR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.82 | $1.82 |
| 10 | $1.65 | $16.50 |
| 100 | $1.34 | $134.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $1.05 | $1,050.00 |
ATTINY816-SNR Overview
An 8-bit microcontroller (MCU) is a small, self-contained computing system on a single integrated circuit that integrates a CPU, RAM, non-volatile program memory, and a rich set of peripheral interfaces. Within the broader taxonomy, the ATTINY816 belongs to the tinyAVR subfamily of AVR RISC microcontrollers -> 8-bit MCU family -> microcontroller -> embedded IC -> semiconductor. The "tiny" prefix denotes the lowest-pin-count, lowest-power tier of the AVR family, typically used where cost, board area, and battery life dominate over raw processing throughput.
Key features of the ATTINY816-SNR include the Event System and SleepWalking peripherals for ultra-low-power autonomous operation, a Peripheral Touch Controller (PTC) supporting capacitive touch sensing, a 10-bit ADC, configurable custom logic, and a 16-bit timer with three compare channels. The 20 MHz maximum clock, 8 KB self-programmable Flash, and 512 B SRAM support modest control loops and communication stacks including I2C, SPI, and UART.
Architecture-wise, the part uses the modern tinyAVR 1-series core which adds a hardware multiplier (single-cycle 8x8 multiply), a more deterministic interrupt controller, and improved low-power modes versus legacy ATtiny parts. The integrated 20 MHz internal oscillator eliminates the need for an external crystal in most applications, saving two PCB pins and BOM cost.
Typical applications include capacitive touch user interfaces, LED lighting controllers, low-power IoT sensor nodes, consumer appliances, battery-powered toys, and functional-safety-relevant embedded systems. The wide 1.8V to 5.5V supply range allows direct operation from a single Li-ion cell or from 3.3V/5V digital rails.
Design consideration: vertical migration within the tinyAVR 1-series (ATtiny416, ATtiny816, ATtiny1614, ATtiny3216) is pin-compatible, so a PCB designed for ATtiny816 will accept larger-Flash siblings without layout changes.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing information gain beyond what DigiKey, Mouser, and Octopart offer individually.
Drop-in alternatives for ATTINY816-SNR — 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 ATTINY816-SNR (same form factor and footprint) — differing in Package, ADC, Core Architecture, Core Independent Peripherals, DAC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATTINY416-SNR
✅ Drop-In📋 Reference alternative (not in catalog)
ATTINY816-SNRG
✅ Drop-In📋 Reference alternative (not in catalog)
ATTINY1614-SNR
✅ Drop-In📋 Reference alternative (not in catalog)
ATTINY1616-SNR
✅ Drop-In📋 Reference alternative (not in catalog)
ATTINY816-SNR Maximum Ratings & Electrical Characteristics
| Series | tinyAVR 1-series |
| Core Architecture | AVR (8-bit RISC) |
| Core Size | 8-bit |
| Max CPU Speed | 20 MHz |
| Program Memory (Flash) | 8 KB (8K x 8) |
| SRAM | 512 bytes |
| EEPROM | 128 bytes |
| Supply Voltage (VDD) | 1.8 V to 5.5 V |
| Package | 20-pin SOIC (SOIC-20, 7.5 mm body width) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +105 C |
| I/O Pins | 18 (maximum) |
| ADC | 10-bit, up to 12 channels |
| Peripheral Touch Controller (PTC) | Yes (capacitive touch supported) |
| Hardware Multiplier | Yes (single-cycle 8x8) |
| Communication Interfaces | I2C, SPI, UART/USART |
| Functional Safety (FuSa) | Yes (per tinyAVR 1-series datasheet) |
| Core Independent Peripherals | Event System, SleepWalking, Configurable Custom Logic |
| RoHS Status | Compliant |
ATTINY816-SNR Pin Configuration
| Pin 1 | VCC — Supply voltage (1.8 V to 5.5 V) |
| Pin 2 | PC0 — Port C bit 0 (GPIO / ADC0 / AIN0) |
| Pin 3 | PC1 — Port C bit 1 (GPIO / ADC1 / AIN1) |
| Pin 4 | PC2 — Port C bit 2 (GPIO / ADC2) |
| Pin 5 | PC3 — Port C bit 3 (GPIO / ADC3) |
| Pin 6 | GND — Ground reference |
| Pin 7 | PC4 — Port C bit 4 (GPIO / ADC4) |
| Pin 8 | PC5 — Port C bit 5 (GPIO / ADC5) |
| Pin 9 | PA0 — Port A bit 0 (GPIO / MOSI / TXD) |
| Pin 10 | PA1 — Port A bit 1 (GPIO / MISO / RXD) |
| Pin 11 | PA2 — Port A bit 2 (GPIO / SCK / SS) |
| Pin 12 | PA3 — Port A bit 3 (GPIO) |
| Pin 13 | GND — Ground reference |
| Pin 14 | PA4 — Port A bit 4 (GPIO) |
| Pin 15 | PA5 — Port A bit 5 (GPIO / TDI) |
| Pin 16 | PA6 — Port A bit 6 (GPIO / TDO) |
| Pin 17 | PA7 — Port A bit 7 (GPIO) |
| Pin 18 | RESET — Reset input (active low) |
| Pin 19 | UPDI — Unified Program and Debug Interface |
| Pin 20 | VCC — Supply voltage (duplicate pin for power decoupling) |
Typical Applications
ATTINY816-SNR is suitable for 7 applications: Capacitive Touch User Interface, Battery-Powered IoT Sensor Node, LED Lighting Controller, Consumer Appliance Control, Industrial Sensor Signal Conditioner, Functional-Safety Embedded Subsystem, Hobbyist and Maker Projects.
Capacitive Touch User Interface
The ATTINY816-SNR is purpose-built for capacitive touch user interfaces thanks to its integrated Peripheral Touch Controller (PTC) supporting Self-Capacitance, Mutual-Capacitance, and QTouchADC acquisition modes. The PTC can scan up to 12 buttons or implement sliders and wheels autonomously without CPU intervention, freeing the AVR core for system logic. With 8 KB Flash and 512 B SRAM, the MCU fits standard touch libraries plus application code for appliance front panels, white-goods controls, and consumer electronics overlays. The 1.8V to 5.5V VDD range lets the same firmware drive 3.3V and 5V touch sensors.
Recommended
Battery-Powered IoT Sensor Node
The ATTINY816-SNR fits battery-powered IoT sensor nodes because of its tinyAVR 1-series Event System and SleepWalking peripherals, which let timers, ADC, and communication peripherals operate autonomously while the CPU remains in deep sleep. Active current is sub-5 mA at 20 MHz, and the device drops to microampere-level Sleep current when idle. The 1.8V to 5.5V VDD range accepts a single Li-ion or 2x AA cell directly, removing the need for a boost regulator. The 10-bit ADC plus I2C/SPI/UART links support temperature, humidity, accelerometer, and LoRa/Sub-GHz radio daughter boards.
Recommended
LED Lighting Controller
The ATTINY816-SNR drives LED lighting controllers via its 16-bit timer with three PWM compare channels, supporting high-resolution color-mixing and dimming with minimal CPU overhead. The Configurable Custom Logic block lets glue logic run without waking the core, while Event System triggers ADC conversions timed to PWM edges for accurate current sensing. The 20 MHz clock and 8 KB Flash accommodate WS2812/APA102 addressable-LED protocols or DMX512 receivers in architectural and stage lighting. Operating from 1.8V to 5.5V allows direct battery-powered decorative light strings.
Recommended
Consumer Appliance Control
The ATTINY816-SNR suits consumer appliance controls (coffee makers, kitchen helpers, washing machine sub-boards) because of its Functional Safety (FuSa) features, 18 GPIO pins, and wide 4.5V to 5.5V operating margin typical of rectified mains-powered appliances. The Event System drives motor-control loops and user-interface scanning independently of the core, while the 128 B EEPROM stores user-set preferences across power cycles. The 8 KB Flash accommodates state-machine firmware plus diagnostic logging, and the SOIC-20 package supports robust through-hole-friendly hand-rework on white-goods production lines.
Recommended
Industrial Sensor Signal Conditioner
The ATTINY816-SNR works well as an industrial sensor signal conditioner, providing on-board amplification, linearization, and digital conversion of analog transducer signals. The 10-bit ADC with up to 12 channels supports multi-sensor scanning, while the hardware 8x8 multiplier enables real-time compensation algorithms for thermocouples, RTDs, and bridge-type pressure sensors. The Configurable Custom Logic offloads threshold detection and interrupt generation without CPU wakeup, dramatically reducing average current draw in remote monitoring stations. Industrial -40C to +105C temperature rating matches factory-floor deployment requirements.
Recommended
Functional-Safety Embedded Subsystem
The ATTINY816-SNR carries Functional Safety (FuSa) features per the Microchip tinyAVR 1-series datasheet, including hardware CRC, voltage brown-out detection, watchdog timer with separate oscillator, and self-test routines for the AVR core. These features let it serve as a safety companion MCU in larger systems, performing redundant sensor reads and interlock checks on motor-control, power-conversion, or thermal-management sub-assemblies. The compact SOIC-20 footprint, 20 MHz throughput, and Event System deterministic response times support ASIL-B-class safety functions in automotive and industrial designs when paired with the automotive ATtiny416/816 datasheet (DS40002014A).
Recommended
Hobbyist and Maker Projects
The ATTINY816-SNR is a popular choice for hobbyist and maker projects because the SOIC-20 wide-body package is hand-solderable on breakout boards and stripboard, unlike the smaller QFN variant. The AVR core is supported by the free Microchip Studio IDE, avr-gcc toolchain, and the Arduino ecosystem via the megaTinyCore board package, lowering the learning curve for first-time users. With 8 KB Flash, 512 B SRAM, 20 MHz clock, and abundant peripherals (ADC, PWM, I2C, SPI, UART, touch, custom logic), beginners get professional-grade capability in an inexpensive DIP-friendly outline for robotics, wearables, and educational kits.
Recommended
Recommended Products Summary
Engineering reference data for ATTINY816-SNR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATTINY416-SNR | ATTINY1614-SNR | ATTINY1616-SNR |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-20 | SOIC-20 - same | SOIC-20 - same | SOIC-20 - same |
| Core | 8-bit AVR | 8-bit AVR | 8-bit AVR | 8-bit AVR |
| Max Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Flash Memory | 8 KB | 4 KB | 16 KB | 16 KB |
| SRAM | 512 B | 256 B | 1 KB | 1 KB |
| EEPROM | 128 B | 128 B | 128 B | 128 B |
| Supply Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Peripheral Touch Controller | Yes | Yes | Yes | Yes |
Key Differentiators
- Integrated Peripheral Touch Controller (PTC) eliminates external touch IC (vs ATMEGA328P-AUR)
- Event System enables true zero-CPU peripheral triggers (vs ATMEGA48A-AU)
- 1.8 V to 5.5 V supply range supports battery and 5V rails (vs PIC18F25Q43-I/STX)
Design Notes
Place a 100 nF decoupling capacitor as close as physically possible between VCC (pin 1) and GND (pin 6 or 13), plus a 10 uF bulk capacitor on the same net near the MCU. The tinyAVR 1-series Event System and SleepWalking can drive Sleep current into the microampere range, so a clean supply is critical to achieving the datasheet Sleep figures. Avoid sharing the ADC reference pin with high-current digital loads.
The UPDI pin (pin 19) is the single-wire Unified Program and Debug Interface for both in-system programming and on-chip debugging. Route a 1 kohm series resistor on the UPDI line close to the MCU to allow reliable programming through long cables or isolation barriers. Expose the UPDI, VCC, and GND on a 3-pin test header so a pymcuprog or MPLAB Snap can attach without disturbing the rest of the PCB.
Estimated: the ATTINY816's internal 20 MHz oscillator is factory-calibrated to +/- 2% across 0C to 70C but can drift to +/- 5% across the full -40C to +125C industrial range. For UART links above 115200 baud or for time-sensitive protocols, plan for either an external crystal (where pin resources permit) or periodic software calibration against a host reference. Also, never drive RESET (pin 18) high directly without a 10 kohm pull-up; floating the pin in noisy environments will cause spurious resets and unreliable firmware startup.
The UPDI single-wire programming interface is shared with GPIO functionality on PA0. When designing the PCB, leave a 0 ohm series resistor or solder bridge on the UPDI trace so the line can be isolated from external circuitry during programming. Likewise, place the PTC touch sensor traces on the opposite side of the PCB from noisy switching rails to keep the touch sensitivity margin stable; shield the touch lines with a hatched ground pour if the enclosure is metal.
Compliance Information
RoHS and REACH compliant per Microchip product page. The standard ATTINY816-SNR is not AEC-Q100 qualified; the automotive ATtiny416/816 family (DS40002014A) carries AEC-Q100 Grade 1.
