ATTINY426-MU - 20MHz 4KB 8-Bit Microcontroller | Microchip
Référence : ATTINY426-MU ✓ ActifATTINY426-MU Présentation
A microcontroller is a programmable semiconductor that integrates a CPU core, memory, and peripherals onto one device. The ATTINY426 belongs to the tinyAVR 2 family, a low-power 8-bit microcontroller line commonly used for local control, sensing, actuator management, and small consumer or industrial products. Its 20-pin VQFN package supports space-constrained boards while exposing GPIO and communication resources needed for embedded subsystems.
The device provides 4 KB of Flash for program storage, 512 bytes of SRAM for working data, and 128 bytes of EEPROM for nonvolatile parameter storage. The AVR CPU includes a hardware multiplier and operates at speeds up to 20 MHz. According to the Microchip ATtiny426 product page, the ATtiny426 family is available in 20-pin VQFN 3 x 3 mm, SSOP, and SOIC packages; the -MU ordering code identifies the 20-pin VQFN configuration.
The tinyAVR 2 architecture emphasizes efficient event handling, configurable peripherals, and low-power operation. These characteristics make the ATTINY426-MU suitable for consumer appliances, building controls, sensor nodes, lighting systems, and compact motor-control or interface modules where a small MCU with integrated memories is preferable to a larger general-purpose processor.
Typical designs use the microcontroller for state sequencing, digital input conditioning, sensor acquisition, and driving indicators or small actuators. Serial interfaces allow connection to sensors, memory, or host equipment, while GPIO pins support switches, alarms, and discrete control outputs. Designers should confirm clock, peripheral, and pin assignments in the ATtiny424/426/427/824/826/827 datasheet before finalizing the PCB.
For low-power products, select the appropriate clock and sleep configuration, disable unused peripherals, and size external decoupling capacitors according to the circuit guidelines in the manufacturer datasheet. The small VQFN land pattern also requires careful PCB layout, assembly-process capability, and thermal review; adequate exposed-pad soldering and copper connectivity are important for reliable production performance.
This product summary combines the exact ATTINY426-MU orderable configuration with the ATtiny426 family architecture, practical application guidance, package considerations, and sourcing information. It is intended to help engineers quickly assess whether the 20 MHz AVR core, 4 KB Flash footprint, and 3 x 3 mm VQFN package fit a specific embedded-control design.
Alternatives de remplacement direct pour ATTINY426-MU — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATTINY426-MU (même facteur de forme et même empreinte) — différant par ADC Resolution, EEPROM, Package, Product Type, RoHS Status.
ATTINY426-MUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATTINY426-MU
✅ Remplacement direct ⚠️ Spécifications non vérifiéesContactez-nous pour le prix
Voir la fiche technique →ATTINY427-MU
✅ Remplacement direct ⚠️ Spécifications non vérifiéesContactez-nous pour le prix
Voir la fiche technique →ATTINY826-MU
✅ Remplacement direct ⚠️ Spécifications non vérifiéesContactez-nous pour le prix
Voir la fiche technique →ATTINY828-MU
✅ Remplacement direct ⚠️ Spécifications non vérifiéesContactez-nous pour le prix
Voir la fiche technique →ATTINY426-MU Valeurs maximales et caractéristiques électriques
| Product Type | 8-bit AVR tinyAVR 2 microcontroller |
| Maximum CPU Frequency | 20 MHz |
| Flash Memory | 4 KB |
| SRAM | 512 bytes |
| EEPROM | 128 bytes |
| CPU Architecture | AVR with hardware multiplier |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Plage de température de fonctionnement | -40 °C to +85 °C |
| Boîtier | 20-pin VQFN, 3 x 3 mm |
| Type de montage | Surface mount |
| ADC Resolution | 12-bit |
| GPIO Pin Count | 18 pins |
| Bit Architecture | 8-bit |
| Program Memory Type | Built-in Flash |
| Statut RoHS | Compliant |
| Green Compliance | Green |
| Ordering Code | ATTINY426-MU |
Guide de configuration des broches du ATTINY426-MU 20-pin vqfn, 3 x 3 mm
Configuration des broches du ATTINY426-MU (boîtier 20-pin vqfn, 3 x 3 mm). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour ATTINY426-MU.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ATTINY426-MU convient pour 6 applications: Battery-Powered Sensor Node, Smart Home Control Module, LED Lighting Controller, Consumer Appliance Interface, Industrial Status and Alarm Module, Small Motor or Relay Sequencer.
Battery-Powered Sensor Node
The ATTINY426-MU is well suited to a compact battery-powered sensor node because it combines a 20 MHz AVR CPU, 512 bytes of SRAM, and 128 bytes of EEPROM in a 3 x 3 mm VQFN. The 1.8 V to 5.5 V operating range supports common regulated sensor rails, while the small package preserves board area for the battery, sensor, and radio interface. Configure an appropriate low-power clock and sleep mode, then disable unused peripherals to control average current. The 4 KB Flash limit requires concise firmware, so event-driven sensing and interrupt-driven state updates are preferable to continuous polling. EEPROM is useful for calibration constants and configuration data that must survive power loss.
Recommandé
Smart Home Control Module
The ATTINY426-MU can serve as the local controller in a compact smart-home module that coordinates switches, indicators, and simple sensors. Its 20 GPIO pins provide practical interface capacity for user inputs, status LEDs, alarm outputs, and external interfaces, while the 20 MHz AVR core provides deterministic response for debouncing and state logic. The 4 KB Flash footprint is suitable for a focused firmware image rather than a broad application framework. Serial communication resources can connect the module to a host or more capable gateway. Use the manufacturer pin-description table to assign multiplexing-sensitive signals and place input filtering close to the device to reduce susceptibility to noisy domestic or industrial environments.
Recommandé
LED Lighting Controller
The ATTINY426-MU is appropriate for LED lighting control modules that require timed output sequences, button handling, and status indication in a small board area. Its 20 MHz AVR core can manage multiple PWM-related outputs and event-driven timing, while 512 bytes of SRAM is adequate for compact state tables and short display or indicator buffers. The 3 x 3 mm VQFN package helps reduce the footprint of compact luminaires and controller modules. Choose a regulator and current driver according to the LED topology and total load, keeping the MCU supply independent from noisy power conversion. Firmware should include safe LED states at reset and power loss, and the final timing and PWM behavior should be checked against the selected peripherals.
Recommandé
Consumer Appliance Interface
The ATTINY426-MU fits appliance interface boards that translate user controls and sensor inputs into deterministic internal commands. Its 8-bit architecture and 4 KB of Flash are sufficient for a focused control task such as operating a display sequence, managing a buzzer, checking switches, or supervising another subsystem. The 20-pin VQFN allows the controller to coexist with power-conversion circuitry in space-constrained products, while the 1.8 V to 5.5 V range supports multiple embedded supply architectures. Review the datasheet for the exact peripheral instance and alternate-function assignments before finalizing PCB tracks. Production firmware should validate switch debounce, handle abnormal sensor states, and preserve safe outputs during reset.
Recommandé
Industrial Status and Alarm Module
The ATTINY426-MU can support an industrial status and alarm module that monitors discrete inputs, drives indicator outputs, and communicates state to a higher-level controller. Its 20 MHz processing capability supports responsive input handling, and 128 bytes of EEPROM can retain configuration such as thresholds or identity information. The 20-pin VQFN package simplifies compact panel or remote-I/O implementations. Because industrial environments may contain noisy or long cables, use suitable input conditioning, protection, grounding, and isolation where required rather than relying on the microcontroller's internal pins for direct field wiring. The module should define fail-safe output states and use the reset behavior in the firmware to avoid unintended actuator activation.
Recommandé
Small Motor or Relay Sequencer
The ATTINY426-MU is suitable for a small sequencing controller that manages relays, stepper indexing, valves, or limited motor functions. The AVR CPU can execute deterministic timing routines, while the hardware multiplier and 20 MHz operating speed provide useful arithmetic and control headroom for compact motion logic. The device should not drive motors or relay coils directly; external transistor, MOSFET, flyback, and protection circuits are required. The 3 x 3 mm VQFN leaves board area for those power components, but its thermal and assembly requirements demand careful exposed-pad layout. Firmware must include de-energized startup states, motion limits, and fault recovery to prevent unsafe continuous activation.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATTINY426-MU — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATTINY426-MUR | ATTINY426-MU | ATTINY427-MU | ATTINY826-MU | ATTINY828-MU |
|---|---|---|---|---|---|---|
| Package | VQFN-20 (3 x 3 mm) | VQFN-20 (3 x 3 mm) | VQFN-20 (3 x 3 mm) | VQFN-20 (3 x 3 mm) | VQFN-20 (3 x 3 mm) | VQFN-20 (3 x 3 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Flash Memory | 4 KB | 4 KB | 4 KB | 8 KB | 8 KB | 8 KB |
| SRAM | 512 bytes | 512 bytes | 512 bytes | 1 KB | 1 KB | 1 KB |
| EEPROM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Supply Voltage Range | 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 | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Principaux différenciateurs
- Smaller Flash capacity supports fit to focused firmware (vs ATTINY427-MU)
- Compact surface-mount footprint (vs ATTINY826-MU)
- 20 MHz AVR control with hardware multiplier (vs ATTINY828-MU)
Notes de conception
Design the VQFN land pattern around the manufacturer package drawing and the PCB assembly process. Maintain the specified pad dimensions, solder-mask definition, and exposed-pad connection rather than treating the package as a generic 20-pin quad package. Route power and decoupling connections directly to the relevant pins, and use the recommended paste and reflow profile to achieve reliable exposed-pad soldering.
Place the input and output decoupling capacitors close to their associated supply pins, and keep high-current return paths away from sensitive signal traces. The ATTINY426-MU operates from 1.8 V to 5.5 V, but the permissible clock range and peripheral performance depend on the selected supply voltage. Verify reset, brownout, and power-sequencing behavior across the complete input-voltage range before releasing the design.
Do not assume that identical package dimensions guarantee interchangeable behavior. The family includes devices with 4 KB or 8 KB Flash, and alternate functions may differ among members. Before replacing an ATTINY426-MU, compare the exact pin description, peripheral instance, clock limits, memory size, startup behavior, and device programming requirements. Treat a package match as the starting point for review, not the final compatibility decision.
For low-power operation, select the clock source and sleep mode early in the firmware architecture, disable unused peripherals, and make sensor or communication activity interrupt-driven. The 4 KB Flash and 512-byte SRAM constrain buffer-heavy designs, so use compact state machines and transmit only meaningful data. Measure current at the device supply because average consumption is determined by both the MCU activity profile and external load behavior.
Informations de conformité
The product listing identifies the ATTINY426-MU as RoHS compliant and Green. Other compliance attributes are not stated in the listed manufacturer and distributor information.
