ATMEGA32L-8PC - 8-Bit AVR MCU 8MHz 32KB Flash 40-PDIP | Microchip
MPN: ATMEGA32L-8PC ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ATMEGA32L-8PC Overview
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and programmable peripherals into one chip, forming the lowest layer of the embedded-system hierarchy: microcontroller -> embedded processor -> computing system. The AVR ATmega family from Atmel (now Microchip Technology) is an 8-bit Harvard-architecture RISC family in which most of the 131 instructions execute in a single clock cycle.
Key features include 32KB self-programming FLASH with read-while-write capability, 2KB internal SRAM, 1KB EEPROM for non-volatile data, 32 general-purpose I/O lines, and an 8-channel 10-bit analog-to-digital converter. The ATMEGA32L speed grade runs from 0 to 8MHz over a wide 2.7V to 5.5V operating voltage range, making it well suited to battery-powered designs where the standard-speed ATMEGA32 (4.5V to 5.5V, up to 16MHz) cannot be used.
The AVR advanced RISC architecture uses 32 general-purpose working registers directly connected to the ALU, allowing one-cycle execution of most instructions and delivering up to 8 MIPS throughput at the 8MHz maximum clock of this speed grade. On-chip JTAG enables boundary-scan testing and in-system debugging, while the self-programming FLASH supports bootloader firmware updates in the field. Power consumption is low: at 1MHz, 3V, and 25 degrees C the device draws approximately 1.1mA in active mode, 0.35mA in idle mode, and less than 1uA in power-down mode.
Typical applications include industrial control and automation nodes, hobby and educational development boards, low-power sensor acquisition systems using the 10-bit ADC, and legacy product maintenance where the through-hole 40-PDIP footprint simplifies hand assembly and rework.
A key design consideration is clock selection: at 5V the 8MHz limit of the L grade constrains MIPS compared with the 16MHz ATMEGA32, so designs needing more throughput should use the faster part, while 3V battery designs benefit from the L grade's 2.7V low-voltage operation. Always verify fuse settings for clock source and brown-out detection.
This page synthesizes verified distributor data, drop-in alternatives, pinout information, and practical design notes not found in a single manufacturer source.
Drop-in alternatives for ATMEGA32L-8PC — 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 ATMEGA32L-8PC (same form factor and footprint) — differing in Package, Communication Interfaces, Operating Temperature, EEPROM, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA32A-PU
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →ATMEGA32A-PN
✅ Drop-In✓ In Stock
$4.15 / Unit
View Datasheet →ATMEGA32L-8PU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$9.75 / Unit
View Datasheet →ATMEGA16L-8PU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.55 / Unit
View Datasheet →ATMEGA32L-8PC Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Maximum Clock Frequency | 8 MHz |
| FLASH Program Memory | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Operating Voltage Range | 2.7 V to 5.5 V (ATMEGA32L) |
| Instructions | 131 instructions, most single-cycle |
| General Purpose Working Registers | 32 x 8-bit |
| General Purpose I/O Lines | 32 |
| ADC | 8-channel 10-bit |
| JTAG Interface | On-chip-debug and boundary scan |
| Active Mode Current | 1.1 mA (1 MHz, 3 V, 25 C) |
| Idle Mode Current | 0.35 mA (1 MHz, 3 V, 25 C) |
| Power-down Mode Current | < 1 uA |
| Package | 40-PDIP (P) |
| Mounting Type | Through Hole |
| Throughput | Up to 8 MIPS at 8 MHz |
| Programmability | In-System Programmable (ISP) FLASH, self-programming |
ATMEGA32L-8PC Pin Configuration
| Pin 1 | PB0 (XCK/T0) — Port B bit 0 / USART external clock / Timer0 external clock |
| Pin 2 | PB1 (T1) — Port B bit 1 / Timer1 external clock |
| Pin 3 | PB2 (AIN0/INT2) — Port B bit 2 / analog comparator input 0 / external interrupt 2 |
| Pin 4 | PB3 (AIN1/OC0) — Port B bit 3 / analog comparator input 1 / Timer0 output compare |
| Pin 5 | PB4 (SS) — Port B bit 4 / SPI slave select |
| Pin 6 | PB5 (MOSI) — Port B bit 5 / SPI master output |
| Pin 7 | PB6 (MISO) — Port B bit 6 / SPI master input |
| Pin 8 | PB7 (SCK) — Port B bit 7 / SPI serial clock |
| Pin 9 | RESET — Active-low reset input |
| Pin 10 | VCC — Digital supply voltage (2.7V to 5.5V for L grade) |
| Pin 11 | GND — Ground |
| Pin 12 | XTAL2 — Oscillator output (crystal inverter output) |
| Pin 13 | XTAL1 — Oscillator input (external clock input) |
| Pin 14 | PD0 (RXD) — Port D bit 0 / USART receive |
| Pin 15 | PD1 (TXD) — Port D bit 1 / USART transmit |
| Pin 16 | PD2 (INT0) — Port D bit 2 / external interrupt 0 |
| Pin 17 | PD3 (INT1) — Port D bit 3 / external interrupt 1 |
| Pin 18 | PD4 (OC1B) — Port D bit 4 / Timer1 output compare B |
| Pin 19 | PD5 (OC1A) — Port D bit 5 / Timer1 output compare A |
| Pin 20 | PD6 (ICP1) — Port D bit 6 / Timer1 input capture |
| Pin 21 | PD7 (OC2) — Port D bit 7 / Timer2 output compare |
| Pin 22 | PC0 (SCL) — Port C bit 0 / TWI serial clock |
| Pin 23 | PC1 (SDA) — Port C bit 1 / TWI serial data |
| Pin 24 | PC2 (TCK) — Port C bit 2 / JTAG test clock |
| Pin 25 | PC3 (TMS) — Port C bit 3 / JTAG test mode select |
| Pin 26 | PC4 (TDO) — Port C bit 4 / JTAG test data output |
| Pin 27 | PC5 (TDI) — Port C bit 5 / JTAG test data input |
| Pin 28 | PC6 (TOSC1) — Port C bit 6 / Timer2 oscillator input |
| Pin 29 | PC7 (TOSC2) — Port C bit 7 / Timer2 oscillator output |
| Pin 30 | AVCC — ADC supply voltage (connect to VCC through low-pass filter) |
| Pin 31 | GND — Ground |
| Pin 32 | AREF — ADC analog reference voltage |
| Pin 33 | PA0 (ADC0) — Port A bit 0 / ADC channel 0 |
| Pin 34 | PA1 (ADC1) — Port A bit 1 / ADC channel 1 |
| Pin 35 | PA2 (ADC2) — Port A bit 2 / ADC channel 2 |
| Pin 36 | PA3 (ADC3) — Port A bit 3 / ADC channel 3 |
| Pin 37 | PA4 (ADC4) — Port A bit 4 / ADC channel 4 |
| Pin 38 | PA5 (ADC5) — Port A bit 5 / ADC channel 5 |
| Pin 39 | PA6 (ADC6) — Port A bit 6 / ADC channel 6 |
| Pin 40 | PA7 (ADC7) — Port A bit 7 / ADC channel 7 |
Typical Applications
ATMEGA32L-8PC is suitable for 6 applications: Industrial Control and Automation, Battery-Powered Data Loggers, Educational and Hobby Development Boards, Sensor Acquisition and Measurement, Legacy Product Maintenance and Repair, Embedded Networking and Communication Nodes.
Industrial Control and Automation
The ATMEGA32L-8PC fits industrial control nodes that need moderate processing power, robust I/O, and long product lifecycles. Its 32 general-purpose I/O lines directly drive relays, optocouplers, and status indicators, while the 8-channel 10-bit ADC samples analog process variables such as temperature and pressure at the sensor location. The wide 2.7V to 5.5V supply range tolerates noisy industrial 5V rails with brown-out protection enabled. JTAG on-chip-debug shortens commissioning time by allowing breakpoints and register inspection on the live board, and the self-programming 32KB FLASH supports field firmware updates through a bootloader, avoiding disassembly of installed equipment.
Recommended
Battery-Powered Data Loggers
For battery instruments, the L speed grade is decisive: the ATMEGA32L-8PC operates down to 2.7V, directly compatible with two alkaline cells or a single lithium cell with a simple regulator. At 1MHz and 3V the device draws about 1.1mA active, 0.35mA in idle mode, and under 1uA in power-down mode per the Microchip datasheet (doc2503), so a duty-cycled design sleeping between samples achieves multi-year battery life. The 1KB EEPROM retains calibration constants across power cycles without external NVM, and the 10-bit ADC digitizes sensor outputs directly. Keep the clock at 1-2MHz during acquisition and enter power-down between readings to minimize average current.
Recommended
Educational and Hobby Development Boards
The 40-PDIP through-hole package is the main reason this part dominates educational and hobby platforms: it can be soldered by hand, socketed for reuse, and replaced after wiring mistakes. The AVR architecture with 131 mostly single-cycle instructions and 32 working registers is well documented in university courses, and free toolchains plus ISP programming via a 6-pin header keep the entry cost near zero. JTAG allows classroom debugging with hardware breakpoints. The 8MHz L grade removes the need for regulated 5V supplies in student projects, running from 3.3V modules and USB battery packs within the 2.7V to 5.5V datasheet range.
Recommended
Sensor Acquisition and Measurement
The integrated 8-channel 10-bit ADC makes the ATMEGA32L-8PC a compact measurement front end: up to eight analog inputs are digitized without an external converter, saving board area and BOM cost. With AVCC as the ADC reference and a decoupled AREF pin (pins 30-32 on the DIP-40), effective resolution of roughly 8-9 bits is achievable in quiet layouts; for better accuracy, drive AREF from a precision reference. Sample rates of a few kHz per channel are practical at the 8MHz clock. Results are timestamped against the 16-bit Timer/Counter1 input capture and streamed over the hardware USART (PD0/PD1) to a host.
Recommended
Legacy Product Maintenance and Repair
Many installed industrial and consumer products from the 2000s shipped with ATmega32 parts in DIP-40 or PLCC footprints, making the ATMEGA32L-8PC a stock item for repair shops and end-of-life service programs. Because the A revision is pin-to-pin compatible, a failed ATMEGA32L-8PC can be exchanged for ATMEGA32A-PU without PCB changes, provided the 4.5V minimum supply of the non-L grade matches the board. Read the EEPROM and FLASH from a working unit with an ISP programmer before replacement to clone configuration bytes and fuse settings, since incorrect fuse configuration is the most common cause of post-repair failures.
Recommended
Embedded Networking and Communication Nodes
The hardware USART (RXD/TXD on PD0/PD1) and TWI I2C-compatible interface (SCL/SDA on PC0/PC1) let the ATMEGA32L-8PC act as a protocol translator or field-bus node between sensors and a host system. At 8MHz, USART rates up to 115200 baud with typical error rates are achievable per the datasheet baud tables, and the TWI master can poll up to 128 I2C addresses. The 2KB SRAM buffers packet payloads for modbus-style frames. Wide 2.7V to 5.5V operation allows direct connection to 3.3V or 5V logic without level shifters when both sides run at the same rail.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA32L-8PC — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA32A-PU | ATMEGA32A-PN | ATMEGA32L-8PU | ATMEGA16L-8PU |
|---|---|---|---|---|---|
| Package | 40-PDIP | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| FLASH Program Memory | 32 KB | 32 KB | 32 KB | 32 KB | 16 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 1 KB |
| Operating Voltage | 2.7 V to 5.5 V | 4.5 V to 5.5 V (standard grade) | 4.5 V to 5.5 V (standard grade) | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Maximum Clock Speed | 8 MHz | 16 MHz (standard grade) | 16 MHz (standard grade) | 8 MHz | 8 MHz |
| Core Revision | ATmega32 (original) | ATmega32A (errata resolved) | ATmega32A (errata resolved) | ATmega32 (original) | ATmega16 |
| JTAG On-Chip Debug | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Low-voltage operation down to 2.7V (vs ATMEGA32A-PU)
- Largest FLASH in the DIP-40 ATmega family at this speed grade (vs ATMEGA16L-8PU)
- Integrated JTAG on-chip-debug (vs ATMEGA328P-PU)
Design Notes
Connect AVCC (pin 30) to VCC through a low-pass filter (typically 10uH inductor with 0.1uF capacitor to ground) to keep ADC noise off the digital supply, even when not using the ADC - the datasheet requires AVCC to be connected. Enable brown-out detection via fuse so the MCU does not execute corrupt code during supply dips; this is especially important on battery designs operating near the 2.7V lower limit of the L grade. In power-down mode the device draws under 1uA, so gate the clock source before sleeping for maximum battery life.
Fuse configuration is the most common failure point when programming and when replacing this part in legacy boards. Verify the clock-source fuses match your crystal (or internal RC) before first programming, and record the target board's fuse bytes before replacing a device during repair - cloning a replacement without setting CKOPT, BOD, and SPIEN fuses correctly produces a board that appears dead. Also note that JTAG shares PC2-PC5; if those I/O are needed, disable JTAGEN via fuse, which then requires ISP or debugWIRE-style access for reprogramming.
Although the 40-PDIP is a through-hole part, layout still matters for ADC performance: keep the analog ground return for AVCC separate from digital switching currents, decouple VCC (pin 10) and AVCC (pin 30) each with 0.1uF ceramic capacitors placed close to the pins, and add a bulk 10uF capacitor near the supply entry. Route the AREF trace away from clock lines; use the internal reference or a clean external reference on pin 32 rather than sharing a noisy supply divider. A ground plane under the socket substantially improves 10-bit ADC effective resolution.
Estimated: at 8MHz, 5V, and full active operation, current draw is on the order of several milliamps (datasheet active mode is 1.1mA at 1MHz/3V; scale linearly to approximately 6-8mA at 8MHz/5V, i.e. about 30-40mW dissipation), so no heatsink or thermal design is required for the PDIP package at any rated condition. Thermal considerations only become relevant if I/O pins are stressed beyond absolute maximum ratings; keep per-pin DC current within datasheet limits (typically 40mA per pin class for AVR I/O) and total package current within the specified maximum.
Compliance Information
Compliance status for the specific ATMEGA32L-8PC ordering code is not stated in the verified web data provided. The Pb-free coded equivalent ATMEGA32A-PN/ATMEGA32L-8PU should be used where RoHS compliance is mandatory; confirm via Microchip's product page or a material declaration certificate.
