ATTINY412-SSNR - 8-bit AVR tinyAVR 1 MCU 20MHz 4KB Flash SOIC-8 | Microchip
MPN: ATTINY412-SSNR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.9 | $0.90 |
| 10 | $0.78 | $7.80 |
| 100 | $0.66 | $66.00 |
| 500 | $0.58 | $290.00 |
| 1,000 | $0.5 | $500.00 |
| 3,000 | $0.42 | $1,260.00 |
ATTINY412-SSNR Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, and integrated peripherals such as ADC, timers, and communication interfaces. The AVR 8-bit RISC architecture executes one instruction per clock cycle, giving the tinyAVR 1-series deterministic throughput at modest clock rates. Within the broader taxonomy, the ATTINY412 sits at the bottom of Microchip's tinyAVR family — a sub-category of 8-bit microcontrollers — positioned below the megaAVR series and far below 32-bit ARM Cortex-M0+ devices such as the SAMD21 in compute, but with a substantially smaller footprint and lower price point.
Key differentiating specifications include 4 KB self-programmable Flash, 256-byte SRAM, 128-byte EEPROM, 20 MHz maximum CPU clock, and an operating voltage range of 1.8V to 5.5V. The device exposes 6 GPIO pins (6 usable I/O on the 8-pin SOIC), supports up to 6 PWM channels via Timer/Counter A, integrates a 10-bit 115 ksps ADC with up to 6 analog channels, and offers a peripheral touch controller (PTC) for buttons and sliders. Sleep current is in the single-digit microampere range, making it suitable for battery-powered and energy-harvesting applications.
The architecture combines an AVR 8-bit CPU core with a hardware multiplier for fast 16-bit math, a deterministic interrupt controller, and the Event System — a hardware interconnect that lets peripherals trigger each other without CPU intervention. This core-independent peripheral (CIP) design enables SleepWalking, in which a peripheral can wake the CPU only when a configured event occurs, dramatically reducing average current draw.
Typical applications include low-power IoT sensor nodes, consumer electronics human-machine interfaces (HMI), battery management, LED driving and lighting control, and compact motor or fan control. The PTC and high-resolution PWM make it well-suited to capacitive-touch user interfaces and BLDC or DC motor commutation.
When designing with this part, observe the absolute maximum VDD of 6V and configure the unused pins as outputs with low state to minimize leakage. Migration within the tinyAVR 1-series is straightforward: ATTINY212-SSN shares the same pinout with 2 KB Flash and 128-byte SRAM, while ATTINY414 adds 2 KB Flash. Choose by memory headroom rather than peripheral set.
This document synthesizes distributor pricing, parametric alternatives, and practical design guidance not found in the manufacturer datasheet alone — including cross-brand equivalents sourced from live distributor data and application-specific recommended companion parts.
Drop-in alternatives for ATTINY412-SSNR — 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 ATTINY412-SSNR (same form factor and footprint) — differing in ADC, Operating Temperature, Package, EEPROM, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATTINY212-SSNR
✅ Drop-In📋 Reference alternative (not in catalog)
ATTINY412-SSN
✅ Drop-In📋 Reference alternative (not in catalog)
ATTINY412-SSF
✅ Drop-In✓ In Stock
$0.36 / Unit
View Datasheet →PIC16F1824-I/SN
✅ Drop-In📋 Reference alternative (not in catalog)
ATTINY414-SSNR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ATTINY412-SSNR Maximum Ratings & Electrical Characteristics
| Series | tinyAVR 1 |
| Core | AVR 8-bit RISC with hardware multiplier |
| CPU Architecture | 8-bit |
| Maximum CPU Frequency | 20 MHz |
| Program Memory (Flash) | 4 KB (4K x 8) |
| SRAM | 256 bytes |
| EEPROM | 128 bytes |
| Operating Voltage (VDD) | 1.8 V to 5.5 V |
| Package | 8-pin SOIC (SOIC-8, narrow body) |
| I/O Pins (GPIO) | 6 |
| ADC | 10-bit, up to 115 ksps, up to 6 analog channels |
| PWM Channels | Up to 6 via Timer/Counter A |
| Operating Temperature | -40 C to +105 C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Functional Safety (FuSa) | Yes — FuSa-grade variant available in series |
ATTINY412-SSNR Pin Configuration
| Pin 1 | VDD — Power supply input, 1.8 V to 5.5 V |
| Pin 2 | PA6 — RESET / UPDI programming pin; used for ISP and debug |
| Pin 3 | PA7 — GPIO PA7 / analog input; ADC channel available |
| Pin 4 | PA1 — GPIO PA1 / analog input; ADC channel available |
| Pin 5 | PA2 — GPIO PA2 / analog input; ADC channel available |
| Pin 6 | PA3 — GPIO PA3 / analog input; ADC channel available |
| Pin 7 | GND — Ground reference |
| Pin 8 | PA0 — GPIO PA0 / analog input; ADC channel available |
Typical Applications
ATTINY412-SSNR is suitable for 6 applications: Low-Power IoT Sensor Node, Capacitive-Touch HMI Buttons, LED Lighting and PWM Dimming Controller, Small DC Motor and Fan Control, Battery-Powered Wearable or Fitness Sensor, Automotive Auxiliary Controller.
Low-Power IoT Sensor Node
The ATTINY412-SSNR fits IoT sensor nodes requiring months of battery life and minimal PCB footprint. Its 1.8-5.5 V VDD range lets it run directly from a CR2032 (3 V) or two AA cells, while SleepWalking via the Event System wakes the CPU only when the ADC conversion completes or a sensor threshold is exceeded. The 10-bit ADC with up to 6 channels reads thermistor, light, or battery voltage without external components, and the 256-byte SRAM comfortably buffers 4-axis sensor data before wireless transmission. Compared to a discrete MCU + sleep timer solution, the integrated 20 MHz oscillator with OSCCAL trim eliminates an external crystal and reduces BoM cost below $1.50 for the entire node.
Recommended
Capacitive-Touch HMI Buttons
The ATTINY412-SSNR is well matched to capacitive-touch HMI buttons and sliders thanks to its on-chip Peripheral Touch Controller (PTC), which supports hardware-driven touch acquisition without CPU load. The PTC supports mutual-capacitance and self-capacitance sensing with up to 8 buttons or a slider, with a hardware event trigger that wakes the device on touch. A single 8-pin SOIC can replace a small touch IC plus an external MCU, halving the BoM and PCB area for appliances, lighting controls, and consumer products. The 6 PWM channels also drive LED feedback rings or bar indicators synchronously with the touch event.
Recommended
LED Lighting and PWM Dimming Controller
The ATTINY412-SSNR's Timer/Counter A provides up to 6 PWM channels with 16-bit resolution, enabling smooth dimming of multi-channel LED strings and color-mixing for RGB fixtures. The 20 MHz clock gives PWM frequencies above 100 kHz to keep ripple above the audible band, eliminating PWM-induced flicker in architectural lighting. Operating from 1.8-5.5 V, the same firmware works from a 3.3 V logic rail or a 5 V supply. The Event System synchronizes PWM updates with zero-crossing of the AC mains for phase-cut dimming emulation, reducing EMI and improving compatibility with legacy TRIAC dimmers.
Recommended
Small DC Motor and Fan Control
For small brushed DC motor or blower control, the ATTINY412-SSNR drives a half-H-bridge or integrates with a discrete FET pair for closed-loop RPM control via the ADC and Event System. The fast ADC sampling (up to 115 ksps) reads back-EMF or current-sense voltage for PI control, while the 6 PWM outputs handle phase control, brake, and direction signals. The 20 MHz throughput gives 50 µs control-loop period at full load — fast enough for stable commutation of small fan or pump motors. Operates from 1.8 V to 5.5 V with single-supply operation from a USB or 3-cell alkaline source.
Recommended
Battery-Powered Wearable or Fitness Sensor
The ATTINY412-SSNR's picoPower technology and single-digit microampere sleep current make it suitable for fitness bands, smart rings, and wearable health patches. The 10-bit ADC reads PPG (photoplethysmography) or galvanic skin response signals with sufficient resolution for heart-rate and step-counting algorithms, while the Event System triggers the ADC at fixed intervals without CPU intervention, preserving battery life. The 4 KB Flash fits typical wearable firmware in a single chip, and the SOIC-8 footprint keeps the PCB under 10 mm × 10 mm. Functional Safety (FuSa) variants in the series support medical-grade applications.
Recommended
Automotive Auxiliary Controller
The ATTINY412-SSNR handles auxiliary automotive body and interior functions such as ambient lighting, seat-position LEDs, fan-speed dials, and switch-panel backlight control. The 105 °C ambient rating covers under-dash and cabin mounting, and the 1.8-5.5 V supply connects directly to a 5 V regulated rail after the BCM. The 6 PWM channels drive RGB lighting strips with high-resolution color and dimming control, while the Event System synchronizes PWM with CAN or LIN wake-up events. The small 8-pin SOIC package enables placement behind every switch on the dashboard without it.
Recommended
Recommended Products Summary
Engineering reference data for ATTINY412-SSNR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATTINY212-SSNR | ATTINY412-SSN | ATTINY412-SSF | ATTINY414-SSNR | PIC16F1824-I/SN |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-8 (narrow body) | SOIC-8 — same | SOIC-8 — same | SOIC-8 (wide body) — same SOIC-8 footprint | SOIC-8 — same | SOIC-8 — same |
| Flash Memory | 4 KB | 2 KB (-50%) | 4 KB (same) | 4 KB (same) | 4 KB (same) | 4 KB (same) |
| SRAM | 256 B | 128 B (-50%) | 256 B (same) | 256 B (same) | 256 B (same) | 256 B (same) |
| EEPROM | 128 B | 64 B (-50%) | 128 B (same) | 128 B (same) | 128 B (same) | 256 B (+100%) |
| Maximum CPU Frequency | 20 MHz | 20 MHz (same) | 20 MHz (same) | 20 MHz (same) | 20 MHz (same) | 32 MHz (better) |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V (same) | 1.8 V to 5.5 V (same) | 1.8 V to 5.5 V (same) | 1.8 V to 5.5 V (same) | 1.8 V to 5.5 V (same) |
| ADC Resolution | 10-bit | 10-bit (same) | 10-bit (same) | 10-bit (same) | 10-bit (same) | 10-bit (same) |
| Core Architecture | AVR 8-bit | AVR 8-bit (same ISA) | AVR 8-bit (same ISA) | AVR 8-bit (same ISA) | AVR 8-bit (same ISA) | PIC 8-bit (different ISA, requires firmware rewrite) |
| Approx. Price (qty 100) | $0.66 | $0.55 | $0.66 (same) | $0.66 (same) | $0.72 | $0.85 |
Key Differentiators
- Functional Safety (FuSa) grade variant available in series (vs ATTINY212-SSNR)
- Event System with SleepWalking for sub-µA peripheral operation (vs PIC16F1824-I/SN)
- On-chip Peripheral Touch Controller (PTC) — no external touch IC required (vs ATTINY414-SSNR)
Design Notes
The ATTINY412-SSNR draws < 1 µA in Power-Down sleep with the RTC disabled, and approximately 5-10 µA in Standby with the RTC running, per the ATtiny212/412 datasheet (DS40001911B) typical characteristics. To minimize average current, enable SleepWalking through the Event System so a sensor peripheral can wake the CPU only when its threshold is exceeded. Estimated battery life for a 240 mAh CR2032 running at 10 µA average sleep current plus periodic wake events (1 mA active for 100 ms every 5 s) is approximately 1.5-2 years; verify with a power profile measurement on your final firmware.
Place the decoupling capacitor (100 nF ceramic, plus a bulk 1 µF if available) within 3 mm of the VDD pin. Keep the SOIC-8 thermal pad region clean of ground flood if you are routing traces beneath the package, although the SOIC-8 has no exposed thermal pad — leave the area directly under the IC free of copper polygons to reduce solder joint stress and prevent shorts during reflow.
The PA6 pin serves as both RESET and UPDI programming — once you configure PA6 as a regular GPIO, you lose the easy 2-wire UPDI programming path and must use high-voltage programming or apply the 12 V RESET pulse to recover. If your design must use all 6 GPIO, plan for the UPDI enable sequence with the appropriate fuse setting from the start. Also note: configuring PA6 as an output low prevents future programming without a high-voltage programmer.
For capacitive touch with the on-chip PTC, keep the sensor traces short (under 50 mm) and surrounded by a guard trace driven by the same low-impedance output. Avoid running high-frequency switching signals (PWM > 50 kHz) adjacent to the touch channels — coupling above 1 pF can cause false triggers. Ground the unused analog channels to mid-supply voltage to reduce charge-transfer noise on adjacent channels.
Compliance Information
RoHS compliant per Microchip product page. AEC-Q100 not applicable to this commercial-grade variant — automotive-grade ATtiny412 automotive variants are offered separately by Microchip.
