ATTINY426-XU - 20MHz 4KB AVR Microcontroller | Microchip
Teilenummer: ATTINY426-XU ✓ AktivATTINY426-XU Übersicht
A microcontroller is a compact programmable controller that combines a processor core, nonvolatile program memory, data memory, and peripherals such as timers and serial interfaces on one semiconductor die. The ATTINY426 belongs to the tinyAVR 2 hierarchy: tinyAVR 2 microcontroller, 8-bit AVR RISC core, embedded microcontroller, and semiconductor. It is intended for compact control systems where a small footprint, low-power operation, and deterministic event handling are more important than high processing throughput.
The AVR CPU includes a hardware multiplier and runs at up to 20 MHz. Four kilobytes of Flash support the boot program and application firmware, while 512 bytes of SRAM provide working memory and 128 bytes of EEPROM retain configuration values when the device is unpowered. The family also uses Microchip's event system and flexible low-power peripherals, allowing software-driven responses to external signals without continuous polling.
The ATTINY426 is available in 14-pin, 20-pin, and 24-pin package configurations, including VQFN 3 x 3 mm, SSOP, and SOIC options. The ATTINY426-XU ordering code selects the 20-pin SSOP implementation. Its compact package and broad voltage range suit embedded controls, consumer accessories, compact industrial modules, and battery-powered products where a higher-performance processor would add unnecessary cost, power, or board area.
A practical design must preserve the SSOP footprint, pin assignment, clock configuration, and programming interface when creating a PCB. Designers should also include adequate decoupling, confirm the voltage required for the selected clock frequency, and avoid relying on internal EEPROM for frequently updated data because of its limited endurance. The manufacturer data sheet should be consulted for the complete pin description, electrical limits, and programming details.
This product page combines the manufacturer specifications, package information, sourcing paths, and engineering guidance needed to evaluate the ATTINY426-XU. It also identifies where a genuine same-package drop-in substitution is appropriate and explains the limitations that matter when replacing a microcontroller in an existing design.
Drop-in-Alternativen für ATTINY426-XU – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
ATTINY426-SSU
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ATTINY427-SSU
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ATTINY826-SSU
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ATTINY827-SSU
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ATTINY424-SSU
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ATTINY426-XU Grenzwerte & elektrische Eigenschaften
| Microcontroller Type | 8-bit AVR RISC microcontroller |
| Product Family | tinyAVR 2 |
| Maximum CPU Frequency | 20 MHz |
| Flash Memory | 4 KB |
| Program Memory Organization | 4K x 8 bits |
| SRAM | 512 bytes |
| EEPROM | 128 bytes |
| Operating Supply Voltage Range | 1.8 V to 5.5 V |
| 5 MHz Operating Voltage | 1.8 V |
| 10 MHz Operating Voltage | 2.7 V |
| 20 MHz Maximum CPU Frequency | 20 MHz |
| CPU Architecture | AVR with hardware multiplier |
| Gehäuse | 20-pin SSOP |
| Pin-Anzahl | 20 pins |
| Montageart | Surface mount |
| Automotive Qualification | AEC-Q100 |
ATTINY426-XU 20-pin ssop Pinbelegungsleitfaden
Pinbelegung für ATTINY426-XU (20-pin ssop-Gehäuse). Dieser digitale IC umfasst GPIO, Kommunikationsschnittstellen (UART, SPI, I2C) und Versorgungspins. Alternative Pin-Funktionen und Konfigurationsoptionen entnehmen Sie dem Herstellerdatenblatt. Unverzichtbar für Embedded-System-Design und PCB-Layout.
Keine detaillierten Pinbelegungsdaten verfügbar für ATTINY426-XU.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
ATTINY426-XU ist geeignet für 6 Anwendungs: Compact Industrial Control Module, Battery-Powered Sensor Interface, Consumer Accessory Controller, Communication Interface Adapter, LED and Lighting Controller, Automotive Accessory Electronics.
Compact Industrial Control Module
The ATTINY426-XU fits compact industrial controls because its 20 MHz AVR core can execute deterministic control logic while the 20-pin SSOP keeps the footprint small. The 4 KB Flash store is appropriate for a focused firmware routine, 512 bytes of SRAM supports working state, and the 1.8 V to 5.5 V range allows integration with common low-voltage sensors. Use the event system for time-critical external signals, place local decoupling beside the supply pins, and verify the operating voltage required for the selected 20 MHz clock.
Empfohlen
Battery-Powered Sensor Interface
The ATTINY426-XU is suitable for a battery-powered sensor interface when the design prioritizes low voltage and compact size. Its 5 MHz operating option supports a 1.8 V supply, while the 20 MHz option can serve applications that require faster execution at a higher rail voltage. The 128-byte EEPROM is useful for calibration or configuration values, although frequent writes should be minimized because EEPROM has a finite write endurance. Confirm sleep-mode current and wake timing for the battery budget.
Empfohlen
Consumer Accessory Controller
The ATTINY426-XU can manage buttons, LEDs, status indicators, and a limited peripheral set in a consumer accessory. Its 8-bit architecture and 4 KB Flash are well matched to simple control sequences that do not require a real-time operating system, while the hardware multiplier supports efficient multiply operations in calibration or protocol routines. The 20-pin SSOP reduces board area, but every exposed function still needs a verified PCB land pattern. Use the manufacturer pin description to route programming and peripheral signals.
Empfohlen
Communication Interface Adapter
The ATTINY426-XU can act as a compact protocol adapter or command interpreter between a host and a simple peripheral. At up to 20 MHz, the AVR core provides enough instruction throughput for byte-oriented protocol handling, framing, timeout management, and configuration storage. The small 20-pin SSOP package is useful when the adapter must fit inside an existing enclosure or cable assembly. Validate the serial peripheral pin assignments, external interface levels, timing, and maximum bus voltage in the final schematic.
Empfohlen
LED and Lighting Controller
The ATTINY426-XU is appropriate for a compact LED lighting controller that coordinates timed outputs, button input, fault indicators, and communication commands. Timer resources can establish repeatable switching periods, while firmware can implement fading patterns, current monitoring, and deliberate fault behavior. The 4 KB Flash limit requires disciplined code organization if the product includes extensive lighting scenes. Confirm the exact timer and I/O mappings in the manufacturer pin table and calculate resistor and transistor sizing for the driven LED load.
Empfohlen
Automotive Accessory Electronics
The ATTINY426-XU is a candidate for compact automotive accessory electronics where an 8-bit controller, low-voltage operation, and event-driven control are required. It is identified as an automotive, AEC-Q100 device in the manufacturer-related listing, and its 20 MHz core is adequate for switches, sensing, and actuator management rather than intensive computation. Automotive production use requires the complete Microchip qualification and ordering-code assessment, including temperature grade, package, lifecycle, and system-level validation.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ATTINY426-XU – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ATTINY426-SSU | ATTINY427-SSU | ATTINY826-SSU | ATTINY827-SSU | ATTINY424-SSU |
|---|---|---|---|---|---|---|
| Package | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP |
| 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 | 2 KB |
| SRAM | 512 bytes | 512 bytes | 512 bytes | 1 KB | 1 KB | 512 bytes |
| EEPROM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| CPU Architecture | 8-bit AVR with hardware multiplier | 8-bit AVR with hardware multiplier | 8-bit AVR with hardware multiplier | 8-bit AVR with hardware multiplier | 8-bit AVR with hardware multiplier | 8-bit AVR with hardware multiplier |
Wichtigste Unterscheidungsmerkmale
- Compact 20-pin SSOP implementation (vs. ATTINY826-SSU)
- 20 MHz processing with hardware multiplication (vs. ATTINY424-SSU)
- Balanced memory configuration for embedded controls (vs. ATTINY827-SSU)
Designhinweise
Route the ATTINY426-XU using the 20-pin SSOP land pattern from the manufacturer package drawing and preserve the orientation mark. Place the primary decoupling capacitor directly across the supply and ground pins, then add a smaller high-frequency bypass capacitor at the same regulator node if the board environment is noisy. Keep programming and communication traces away from long motor or switching-node paths to reduce programming errors and signal-integrity problems.
Select the operating frequency and supply rail as a single constraint: the ATTINY426-XU is identified at 5 MHz with a 1.8 V supply, 10 MHz with a 2.7 V supply, and up to 20 MHz at higher operating levels. Confirm the manufacturer frequency-versus-voltage table before selecting crystals, internal clock settings, or external components. A regulator that meets nominal voltage but dips during load changes can still cause unreliable clock operation or unexpected resets.
Do not approve a replacement solely because it is also described as an ATTINY426-family device in a 20-pin SSOP. Compile the original firmware for the candidate, compare every used peripheral and alternate-function pin, verify boot and reset behavior, and confirm memory requirements. Also check ordering suffixes against the manufacturer nomenclature so that the selected device has the intended package form, temperature grade, and qualification status.
Keep the oscillator, decoupling network, and programming access paths close to the device. When an external clock is used, provide a clean, low-noise source and follow the manufacturer layout guidance to avoid coupling from adjacent digital or switching circuitry. For event-driven designs, treat unused pins as deliberate design decisions: leave them unconnected only when the pin table permits it, and terminate externally driven signals at the source.
Compliance-Informationen
The device is identified as automotive and AEC-Q100 in the manufacturer-related datasheet listing. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status were not explicitly established by the retrieved product information.
