Microchip Technology

ATMEGA323L-4AI - 8-bit AVR MCU 32KB 4MHz TQFP-44 | Microchip

MPN: ATMEGA323L-4AI ✗ Cuối đời

2.5V / 3.3V / 5V (L low-voltage grade) Vdss 44-TQFP (10 x 10 mm) Package 4MHz (L speed grade) Speed 32KB (16K x 16) In-System Programmable Flash Memory

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ATMEGA323L-4AI Tóm tắt

The Microchip Technology (Atmel) ATMEGA323L-4AI is a low-power 8-bit AVR RISC microcontroller with 32KB of In-System Programmable Flash (16K x 16), 2KB of SRAM, and a maximum operating frequency of 4MHz, housed in a 44-pin TQFP (10 x 10 mm) package rated for the industrial temperature range (-40C to +85C). The 'L' suffix denotes the low-voltage grade supporting 2.5V, 3.3V and 5V supply operation.

A microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals onto one die, forming the lowest tier of the embedded processing hierarchy (MCU -> embedded processor -> microprocessor). The ATmega323 belongs to the AVR family, based on the AVR enhanced RISC architecture that executes powerful instructions in a single clock cycle, achieving throughputs approaching 1 MIPS per MHz.

Key features include 131 powerful instructions with mostly single-clock cycle execution, eight general purpose working registers, fully static operation up to 16 MIPS throughput capability, and In-System Programmable (ISP) Flash for firmware updates without removing the device from the PCB.

Architecturally, the AVR core uses a Harvard structure with separate program and data buses, allowing instruction fetch and data access to occur simultaneously. This single-cycle execution model is what lets the ATmega323 optimize power consumption versus processing speed, a core design goal stated in the Atmel datasheet.

Typical applications include battery-powered instrumentation, industrial control nodes, consumer appliance control panels, and embedded sensing systems where the low-voltage 2.5V-3.3V operation of the L grade and the compact 10x10 mm TQFP footprint are advantageous.

When designing with this device, verify that your required clock rate does not exceed the 4MHz limit of the L speed grade; higher-frequency needs require the ATMEGA323-8AI (8MHz) variant.

This page synthesizes distributor pricing, verified datasheet parameters, and practical drop-in alternative guidance not consolidated in the manufacturer datasheet.

Bộ thay thế dễ dàng lắp đặt cho ATMEGA323L-4AI — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.

Các biến thể trong loạt này

Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ATMEGA323L-4AI (cùng hình factor và footprint) — khác nhau ở Throughput, Maximum Clock Frequency, Package, EEPROM, Operating Temperature.

ATMEGA16-16AI

Microchip Technology

Throughput: Up to 16 MIPS at 16 MHz

Maximum Clock Frequency: 16 MHz

EEPROM: 512 B

So sánh với ATMEGA323L-4AI →

ATMEGA32-16AUR

Microchip Technology

Throughput: 16 MIPS at 16 MHz

Maximum Clock Frequency: 16 MHz

Package: 44-TQFP (10x10 mm, 0.80 mm pitch)

So sánh với ATMEGA323L-4AI →

ATMEGA323-8AC

Microchip Technology

Throughput: up to 8 MIPS at 8 MHz (approx. 1 MIPS per MHz)

Maximum Clock Frequency: 8 MHz

Package: 44-TQFP (10x10 mm)

So sánh với ATMEGA323L-4AI →

ATMEGA323-8AI

✅ Drop-In ⚠️ Thông số chưa được xác minh

📦 44-TQFP (10x10)

Max clock 8MHz vs 4MHz (+100%), standard voltage grade instead of L low-voltage grade; same die family and TQFP-44 footprint

📋 Tham chiếu thay thế (không có trong danh mục)

ATMEGA323L-8AI

✅ Drop-In ⚠️ Thông số chưa được xác minh

📦 44-TQFP (10x10)

Max clock 8MHz vs 4MHz (+100%) while retaining L low-voltage grade; pin-to-pin compatible

📋 Tham chiếu thay thế (không có trong danh mục)

ATMEGA32-16AUR

✅ Drop-In ⚠️ Thông số chưa được xác minh

Microchip Technology

📦 44-TQFP (10x10)

8-bit AVR RISC · 32 KB (16K x 16) Flash · In-System Programmable Flash · 1 KB · 2 KB · 16 MHz · 16 MIPS at 16 MHz · 4.5 V to 5.5 V

Liên hệ để biết giá

Xem tài liệu →

ATMEGA32-16AI

✅ Drop-In ⚠️ Thông số chưa được xác minh

📦 44-TQFP (10x10)

Industrial-temp variant of ATMEGA32 in TQFP-44: 16MHz max clock vs 4MHz (+300%), same 32KB Flash / 2KB SRAM class; pin-to-pin compatible

📋 Tham chiếu thay thế (không có trong danh mục)

ATMEGA16-16AI

✅ Drop-In ⚠️ Thông số chưa được xác minh

Microchip Technology

📦 44-TQFP (10x10)

8-bit AVR RISC · 16 KB (8K x 16) In-System Programmable · 1 KB · 512 B · 16 MHz · Up to 16 MIPS at 16 MHz · 131 instructions, most single-cycle · 8-channel, 10-bit

Liên hệ để biết giá

Xem tài liệu →

ATMEGA323L-4AI Tỷ lệ tối đa & tính chất điện

Core Processor	AVR
Core Size	8-Bit
Architecture	AVR enhanced RISC
Program Memory Size	32KB (16K x 16) In-System Programmable Flash
RAM Size	2KB
Tần số xung maksimum	4MHz (L speed grade)
Instruction Count	131 powerful instructions
General Purpose Working Registers	8
Throughput	Up to 1 MIPS per MHz
Supply Voltage Range	2.5V / 3.3V / 5V (L low-voltage grade)
Nhiệt độ hoạt động	-40C to +85C (industrial, I suffix)
Hộp	44-TQFP (10 x 10 mm)
Kiểu lắp đặt	Surface Mount
Program Memory Type	FLASH

Hướng dẫn cấu hình chân ATMEGA323L-4AI 44-tqfp (10 x 10 mm)

Cấu hình chân cho ATMEGA323L-4AI (44-tqfp (10 x 10 mm) gói). IC số này bao gồm chân GPIO, giao diện truyền thông (UART, SPI, I2C) và chân nguồn. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết các chức năng chân thay thế và tùy chọn cấu hình. Cực kỳ quan trọng cho thiết kế hệ thống tích hợp và lập trình PCB.

Bảng cấu hình chân 44-tqfp (10 x 10 mm) cho ATMEGA323L-4AI

Không có dữ liệu chân cụ thể sẵn có cho ATMEGA323L-4AI.

Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.

Ứng dụng tiêu biểu

ATMEGA323L-4AI phù hợp cho 6 Áp dụngs: Battery-Powered Portable Instrumentation, Industrial Control Nodes, Legacy Board Maintenance and EOL Replacement, 3.3V Embedded Sensing Systems, Consumer Appliance Control Panels, Embedded Communication Interface Nodes.

📱

Battery-Powered Portable Instrumentation

The ATMEGA323L-4AI fits portable, battery-operated instruments because its L speed grade is characterized for 2.5V and 3.3V supplies, allowing direct operation from two or three cell chemistries without a boost converter. The AVR enhanced RISC core delivers throughput approaching 1 MIPS per MHz, so a 4MHz clock still yields roughly 4 MIPS, sufficient for sensor polling, filtering, and display updates. Its fully static core permits clock stopping in sleep modes, enabling duty-cycled designs that stretch battery life. Place the device in a 44-TQFP (10x10 mm) footprint to conserve board area; the surface-mount package also withstands vibration better than through-hole alternatives in handheld products.

Được đề xuất

ATMEGA169V-8AI · Microchip Technology ATMEGA32-16AU (Pin-compatible higher-speed successor for new designs)

🏭

Industrial Control Nodes

In factory automation nodes, the ATMEGA323L-4AI provides an industrial temperature rating of -40C to +85C (the 'I' suffix), which covers unconditioned control cabinets and outdoor sensor junctions. The 32KB In-System Programmable Flash allows firmware field updates over the ISP interface without desoldering the device, reducing maintenance cost across deployed installations. Four 8-bit I/O ports on the 44-TQFP package give 32 GPIO-class signals for driving relays, optocouplers, and reading limit switches. Because throughput approaches 1 MIPS per MHz, deterministic single-cycle instruction execution simplifies timing-critical control loops, and the 2KB SRAM buffers local data logs between communication intervals.

Được đề xuất

ATMEGA32-16AI (Industrial-temp pin-compatible successor with 16MHz clock) ATMEGA16M1-15AZ · Microchip Technology

🔧

Legacy Board Maintenance and EOL Replacement

For sustaining engineering of ATmega323-based products, the ATMEGA323L-4AI is the exact original-fit device, and the primary drop-in is ATMEGA323-8AI, which shares the identical 44-TQFP footprint and runs at 4MHz when programmed with the same firmware. The single-cycle AVR instruction set and 131-instruction architecture mean no compiler retargeting is needed within the family, preserving the validated firmware binary. Use the In-System Programming capability to reflash replacements directly on the assembled board. When stock of both variants is exhausted, migrate to the pin-compatible ATMEGA32-16AI after re-verifying the voltage range and peripheral register map differences.

Được đề xuất

ATMEGA323-8PI · Microchip Technology ATMEGA32-16AI (Long-term pin-compatible migration path)

🧩

3.3V Embedded Sensing Systems

Mixed-voltage sensing systems benefit from the ATMEGA323L-4AI's low-voltage grade, listed across 2.5V, 3.3V, and 5V per FindIC specifications, which allows direct interfacing with 3.3V ADCs, sensors, and logic without level shifters. At 4MHz the core achieves about 4 MIPS, ample for reading I2C/SPI-class sensor data and performing calibration math in the 2KB SRAM. The 44-TQFP 10x10 mm package keeps the controller compact on dense sensor boards, and the surface-mount land pattern simplifies assembly on two-layer PCBs. Reserve analog port pins for sensor front-ends and verify sleep-mode current budgets against the datasheet electrical characteristics before finalizing the power tree.

Được đề xuất

ATMEGA168V-10AI · Microchip Technology ATMEGA2561V-8MU · Microchip Technology

📺

Consumer Appliance Control Panels

Appliance control panels use the ATMEGA323L-4AI where a 4MHz clock is adequate for keypad scanning, LED/LCD driving, and simple state machines, keeping both cost and EMI low since slower switching reduces harmonic content. The 32KB Flash accommodates menu logic, localization strings, and calibration tables, while the ISP Flash supports firmware updates during appliance manufacturing. The 44-TQFP industrial package handles the elevated ambient temperatures inside enclosures near motors or heaters up to +85C. Throughput near 1 MIPS per MHz ensures responsive user interfaces without resorting to higher-clock parts that increase switching noise in designs sharing a board with analog sensing.

Được đề xuất

ATMEGA169PV-8AUR · Microchip Technology ATMEGA32-16AC · Microchip Technology

🌐

Embedded Communication Interface Nodes

Serial-protocol bridges and communication nodes employ the ATMEGA323L-4AI's AVR core for UART, SPI, and TWI (I2C)-class tasks, with the single-cycle instruction execution providing precise bit-banged timing when hardware peripherals are pinned. The 32KB program space holds protocol stacks and buffering code, and the 2KB SRAM supports frame buffering for Modbus-style polling. Running at only 4MHz reduces radiated emissions, easing EMC compliance in gateways installed near sensitive radio equipment. The 44-pin TQFP exposes four full 8-bit ports for chip-selects, direction controls, and status lines, and the industrial rating supports roadside or rooftop installation environments.

Được đề xuất

ATMEGA16U2-AU · Microchip Technology ATMEGA2560V-8AU · Microchip Technology

Tóm tắt các sản phẩm được đề xuất

What is the ATMEGA323L-4AI microcontroller and what are its key specifications?

The ATMEGA323L-4AI is an 8-bit AVR RISC microcontroller from Microchip Technology (Atmel) with 32KB of In-System Programmable Flash (16K x 16), 2KB of SRAM, and a 4MHz maximum clock in a 44-pin TQFP (10x10 mm) package. Per the Atmel datasheet, it executes 131 powerful instructions mostly in single clock cycles, delivering throughput approaching 1 MIPS per MHz, and the L grade supports 2.5V, 3.3V, and 5V supplies over -40C to +85C.

What is the maximum clock frequency of ATMEGA323L-4AI?

The maximum clock frequency of the ATMEGA323L-4AI is 4MHz, as indicated by the '4' speed-grade digit in the part number and confirmed in the DigiKey product listing which describes it as an '8-Bit 4MHz 32KB FLASH 44-TQFP' device. The L suffix indicates the low-voltage speed grade; if your design requires more processing headroom, the same die family is available as ATMEGA323-8AI at 8MHz in the same TQFP-44 package.

Where to download ATMEGA323L-4AI datasheet PDF?

The ATMEGA323L-4AI datasheet PDF is available from datasheet aggregators such as AllDatasheet (247-page Atmel document, '8-bit Microcontroller with 32K Bytes of In-System Programmable Flash') and from the Microchip product pages. The FindIC entry lists the PDF at approximately 3402KB, published 2003-09-30. For official support, Microchip's website hosts the ATmega323 documentation since Atmel was acquired by Microchip Technology in 2016.

What is the difference between ATMEGA323L-4AI and ATMEGA323L-4PI?

The difference between ATMEGA323L-4AI and ATMEGA323L-4PI is the package: the 'A' suffix denotes a 44-pin TQFP surface-mount package (10 x 10 mm), while the 'P' suffix denotes a 40-pin PDIP through-hole package. Both parts share the identical die, 32KB ISP Flash, 2KB SRAM, 4MHz L speed grade, and industrial temperature range, so the choice depends purely on your PCB assembly process. FindIC lists both variants in its comparison database.

What is the best drop-in replacement for ATMEGA323L-4AI?

The best drop-in replacement is ATMEGA323-8AI, which shares the exact 44-TQFP package and pinout but runs to 8MHz instead of 4MHz; operating it at or below 4MHz makes it fully equivalent. ATMEGA32-16AI is another pin-compatible option in the same TQFP-44 footprint with upgraded peripherals. Note that ATMEGA323L-4PI shares the die but not the package, so it is not drop-in for a TQFP footprint. Verify voltage range fits your design before substitution.

Is ATMEGA323L-4AI still in production and what is its lifecycle status?

The ATMEGA323L-4AI is an older Atmel AVR device released around 2003 and is effectively end-of-life, with availability limited to distributor remaining stock and excess inventory channels per Octopart, which tracks 6 distributors for this part. For new designs, Microchip recommends newer ATmega family members such as ATmega328P or ATmega32/ATmega324 derivatives. For legacy production, secure stock or qualify a pin-compatible successor from the ATmega32 family.

Where to buy ATMEGA323L-4AI online?

You can buy ATMEGA323L-4AI from XAIPART and from distributors including DigiKey (which lists it as 'ships today' with the part description 'AVR ATmega Microcontroller IC 8-Bit 4MHz 32KB FLASH 44-TQFP'), Hotenda, and excess-inventory brokers aggregated on Octopart, which compares pricing across 6 distributors. Because this part is end-of-life, stock quantities are finite; confirm reel or tray quantity and date codes before committing to production volume purchases.

What is the price of ATMEGA323L-4AI?

The unit price of ATMEGA323L-4AI on XAIPART starts at approximately $6.20 for 1 piece as of 2026-09-17, with quantity breaks down to about $3.72 at 1000 pieces. Final pricing varies by distributor stock position because this is an end-of-life part; Octopart compares bulk discounts from 6 distributors, so cross-checking several channels is recommended for volume orders above 500 units.

What supply voltage does ATMEGA323L-4AI require?

The ATMEGA323L-4AI operates at low supply voltages per the 'L' grade designation: FindIC lists the device as supporting 2.5V, 3.3V, and 5V supplies. In practice, the L speed grade is specified for operation down to roughly 2.7V with reduced clock options, which suits battery-powered and 3.3V-logic designs. If your system runs from a fixed 5V rail and needs higher clock rates, the standard-grade ATMEGA323-8AI in the same TQFP-44 package is the appropriate choice.

Can ATMEGA323L-4AI be used in a 3.3V battery-powered design?

Yes, the ATMEGA323L-4AI is well suited to 3.3V battery-powered designs because the 'L' grade is characterized for low-voltage operation (2.5V/3.3V/5V per FindIC specifications) and the AVR core delivers nearly 1 MIPS per MHz, so a 4MHz crystal yields about 4 MIPS of useful processing at very low power. The fully static core also tolerates clock stopping, which supports aggressive sleep-based duty cycling in portable instrumentation and remote sensing products.

ATMEGA323L-4AI vs ATMEGA32-16AU - which is better for a new design?

For a new design, the ATMEGA32-16AU is the better choice: it is pin-compatible in the same 44-TQFP package but offers a 16MHz clock, higher throughput, and active lifecycle status, whereas the ATMEGA323L-4AI is capped at 4MHz and end-of-life. Choose the ATMEGA323L-4AI only when you must maintain a legacy firmware image or replace a failed device in an existing ATmega323-based board without software changes. Migration notes are available from Microchip's cross-reference resources.

What is the best Microchip equivalent for ATMEGA323L-4AI?

Since the ATMEGA323L-4AI is already a Microchip (Atmel) part, the best equivalents are within the same ATmega family: ATMEGA323-8AI for a same-die 8MHz upgrade, and ATMEGA32-16AI/ATMEGA32-16AU for a pin-compatible TQFP-44 successor with enhanced peripherals and 16MHz operation. Microchip's official cross-reference tool (microchipdirect.com/cross-reference) also generates comparable current-generation parts from legacy part numbers for new-design migration.

How many instructions and registers does the ATmega323 AVR core have?

According to the Atmel ATmega323 datasheet, the device implements 131 powerful instructions, most executed in a single clock cycle, and provides 8 general purpose working registers. The AVR enhanced RISC architecture combines this with fully static operation and a Harvard memory structure, achieving throughputs approaching 1 MIPS per MHz. This instruction density and single-cycle execution are the principal reasons ATmega MCUs deliver high code efficiency in 8-bit embedded systems.

Where can I find the ATMEGA323L-4AI pinout for the 44-TQFP package?

The ATMEGA323L-4AI pinout is documented in the 247-page Atmel ATmega323 datasheet (available via AllDatasheet and Microchip), in the package pinout figures for the 44-lead TQFP (10 x 10 mm). The device provides four 8-bit general purpose I/O ports (Port A through Port D) plus power, ground, reset, and crystal pins. Always cross-check the exact pin numbering against the official datasheet figure rather than third-party diagrams before finalizing your PCB land pattern.

Dữ liệu tham khảo kỹ thuật cho ATMEGA323L-4AI — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.

Hướng dẫn chọn lựa

Choose ATMEGA323L-4AI only when you must repair or extend the life of an existing ATmega323-based board running at 4MHz from a 3.3V-class supply: it is the exact original device and preserves the validated firmware binary. If your board has headroom in the voltage spec, ATMEGA323-8AI is the preferred drop-in because it is same-die, same-footprint, runs at 4MHz, and doubles the clock ceiling for future firmware growth. For new designs or long-term production, select ATMEGA32-16AI or ATMEGA32-16AU: pin-compatible in the same 44-TQFP footprint with a 16MHz clock and active lifecycle support, at the cost of re-verifying peripheral registers and voltage ranges. Avoid the ATMEGA323L-4PI in TQFP systems (wrong package) and do not use ATMEGA16-16AI if your firmware exceeds 16KB of Flash. All listed alternatives preserve the PCB land pattern, so no layout rework is required for any substitution path.

So sánh với các sản phẩm thay thế

Tham số	Sản phẩm này	ATMEGA323-8AI	ATMEGA323L-8AI	ATMEGA32-16AU	ATMEGA16-16AI
Package	44-TQFP (10x10 mm)	44-TQFP (10x10 mm) - same	44-TQFP (10x10 mm) - same	44-TQFP (10x10 mm) - same	44-TQFP (10x10 mm) - same
Brand	Microchip Technology (Atmel)	Microchip Technology (Atmel)	Microchip Technology (Atmel)	Microchip Technology (Atmel)	Microchip Technology (Atmel)
Program Memory	32KB (16K x 16) ISP Flash	32KB ISP Flash	32KB ISP Flash	32KB ISP Flash	16KB ISP Flash
Maximum Clock Frequency	4MHz	8MHz	8MHz	16MHz	16MHz
Voltage Grade	L (2.5V/3.3V/5V low-voltage)	Standard grade	L (low-voltage)	Standard grade	Standard grade

Bảo phân biệt quan trọng

Lowest-voltage L grade in the ATmega323 family (vsATMEGA323-8AI)
Same die as 4PI but surface-mount (vsATMEGA323L-4PI)
Direct legacy firmware compatibility (vsATMEGA32-16AU)

Ghi chú thiết kế

The ATMEGA323L-4AI is an L-grade device characterized for 2.5V/3.3V/5V supplies per FindIC specification data. Confirm your rail is within the exact datasheet operating envelope before layout, because the standard-grade ATMEGA323-8AI has a different voltage window. Decouple VCC with 100nF ceramic capacitors at each supply pin pair of the 44-TQFP plus one bulk capacitor (10uF) near the part; the TQFP exposes power pins on multiple package sides, so place local decoupling on the side closest to each supply pin.

Do not clock this part above 4MHz: the '4' in the part number is the L speed-grade maximum, and exceeding it violates the datasheet operating ratings even if the silicon appears to function at room temperature. If your design needs more MIPS, choose the pin-compatible ATMEGA323-8AI (8MHz) or ATMEGA32-16AI (16MHz) instead of overclocking. Additionally, because this part is end-of-life, avoid designing it into new products; use it only for legacy board maintenance, and buy buffer stock with verified date codes.

Use the 10x10 mm TQFP-44 land pattern per the Atmel datasheet package drawing, with thermal relief on ground connections and a solid ground plane on layer 2 of the PCB. Keep the ISP programming header routed short and accessible for field firmware updates to the 32KB In-System Programmable Flash. For analog port usage, route analog traces away from crystal and digital lines; the AVR single-cycle switching edges are fast enough at 4MHz to couple into high-impedance analog nodes on two-layer boards.

Thông tin tuân thủ

RoHS

Unknown

REACH

Unknown

AEC-Q100

Not Applicable

Không chì

Unknown

Không halogen

Unknown

Khoáng vật xung đột

Unknown

The ATMEGA323L-4AI was released around 2003; RoHS/REACH status is not stated in the provided web data and must be confirmed with Microchip or the distributor listing before export-regulated production use.

Dữ liệu được xác minh vào: 2026-09-17 — dữ liệu được xác minh và quản lý bởi đội ngũ kỹ thuật phần cứng của XAIPART

Nguồn: Distributor, Manufacturer Datasheet, Octopart, Distributor, Distributor, Distributor, Distributor

Tìm kiếm liên quan

ATMEGA323L-4AI ATMEGA323L-4AI datasheet PDF Atmel ATmega323L 8-bit microcontroller 32KB ATMEGA323L-4AI 44-TQFP 4MHz MCU ATMEGA323L-4AI drop-in replacement ATMEGA323L-4AI vs ATMEGA323L-4PI ATMEGA323L-4AI price buy stock ATMEGA323L-4AI pinout 44-TQFP low voltage 3.3V AVR microcontroller battery powered ATMEGA323L-4AI equivalent substitute is ATMEGA323L-4AI obsolete end of life AVR ATmega microcontroller industrial control

Các bộ phận và thuật ngữ liên quan

Microchip Technology Atmel Corporation ATMEGA323L-4AI ATMEGA323-8AI ATMEGA323L-4PI ATMEGA32-16AU ATMEGA16-16AI AVR 8-bit microcontroller RISC architecture In-System Programmable Flash 44-TQFP TQFP package family surface mount 1 MIPS per MHz DigiKey Octopart industrial temperature range embedded systems ISP programming