ATMEGA169-16MU - 8-bit AVR MCU 16MHz 16KB Flash 64-QFN | Microchip
MPN: ATMEGA169-16MU ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $13.63 | $13.63 |
| 10 | $12.95 | $129.50 |
| 100 | $12.27 | $1,227.00 |
| 500 | $11.66 | $5,830.00 |
| 1,000 | $11.08 | $11,080.00 |
ATMEGA169-16MU Overview
An 8-bit microcontroller is a single-chip computer that integrates a CPU core, program memory, data memory, and peripherals such as timers, UARTs, and ADCs on one die. The ATmega family belongs to the AVR enhanced RISC architecture line of microcontrollers, a category within the broader embedded processor hierarchy that spans from simple 4-bit controllers to 32-bit application processors.
Key features include 131 powerful AVR instructions, most executing in a single clock cycle, delivering up to 16 MIPS throughput at 16MHz. The device offers full static operation, In-System Programming (ISP) via the self-programming 16KB flash, and a JTAG interface for on-chip debugging and boundary-scan. The 8-channel 10-bit ADC supports analog sensing directly without an external converter, and the supply range of 2.7V to 5.5V supports both 3.3V and 5V systems.
Architecturally, the ATMEGA169-16MU uses a Harvard-structure AVR RISC core with 32 general-purpose working registers directly connected to the ALU, allowing one-cycle instruction execution. The picoPower-class CMOS process yields low active and sleep currents suited to battery-operated designs.
Typical applications include industrial control panels, LCD-based instrumentation (the ATmega169 integrates an LCD controller family heritage used in metering products), consumer appliances, and battery-powered sensing nodes that leverage the integrated ADC.
Design consideration: the 64-QFN exposed pad must be soldered to a grounded copper pour for both thermal relief and reliable ground return; hand rework of this package requires a hot-plate or reflow profile rather than a standard iron.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Pricing references are as of 2026-09-16.
Drop-in alternatives for ATMEGA169-16MU — 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 ATMEGA169-16MU (same form factor and footprint) — differing in Package, Debug Interface, Instructions, Throughput, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA169PA-16MU
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA169P-16MU
✅ Drop-In✓ In Stock
$2.64 / Unit
View Datasheet →ATMEGA165P-16MU
✅ Drop-In✓ In Stock
$2.19 / Unit
View Datasheet →ATMEGA165V-8MU
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →ATMEGA169-16MU Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 16 MHz |
| Program Memory Size | 16 KB (8K x 16) FLASH |
| RAM Size | 1 KB |
| EEPROM Size | 512 B |
| ADC Resolution | 10-bit |
| ADC Channels | 8 |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Debug Interface | JTAG (on-chip debug) |
| Instruction Set | 131 instructions, mostly single-cycle |
| Throughput | 16 MIPS at 16 MHz |
| Package | 64-QFN (9x9 mm), exposed pad |
| Mounting Type | Surface Mount |
ATMEGA169-16MU 64-qfn (9x9 mm), exposed pad Pin Configuration Guide
Pin configuration for ATMEGA169-16MU (64-qfn (9x9 mm), exposed pad package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATMEGA169-16MU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA169-16MU is suitable for 6 applications: Industrial Control Panels, Battery-Powered Metering and Instrumentation, LCD-Based Display Modules, Consumer Appliances, Analog Sensor Nodes, Legacy System Repair and Maintenance.
Industrial Control Panels
The ATMEGA169-16MU suits industrial control panels because its 16 MIPS AVR core at 16MHz executes control-loop and HMI tasks with deterministic single-cycle instructions, while the 5.5V-tolerant 2.7V-5.5V supply connects directly to legacy 5V industrial rails without a regulator stage. Its 8-channel 10-bit ADC digitizes up to eight sensor inputs such as potentiometers, thermistors, and 4-20mA-derived voltages, and the JTAG interface supports in-field debugging through the panel harness. Placed as the main MCU driving keys, LEDs, and a UART link, it delivers robust performance; the exposed-pad QFN requires a solid ground pour to withstand industrial EMI environments.
Recommended
Battery-Powered Metering and Instrumentation
For battery-operated meters and handheld instruments, the ATMEGA169-16MU combines low-power CMOS AVR operation with full static logic down to DC clocking, allowing aggressive clock throttling in sleep states. The 8-channel 10-bit ADC reads battery voltage, current-shunt amplifiers, and environmental sensors directly, and the 512B EEPROM retains calibration constants across battery replacement. Operating from a 2.7V supply (two alkaline cells) up to 5.5V, one firmware image spans multiple battery chemistries. Designers should budget the QFN package's power pad into the thermal layout even at microwatt averages, and use the P/PA successor for measurably lower sleep current in coin-cell designs.
Recommended
LCD-Based Display Modules
The ATmega169 family heritage ties to LCD-driven products such as weight scales and display controllers, and the ATMEGA169-16MU's 64-pin count provides enough I/O to drive segment displays, keypads, and indicator LEDs in parallel rather than through expansion shifters. Running at 16MHz gives headroom for multiplexed display refresh combined with ADC sampling and communication in one firmware loop. The 16KB self-programming flash supports field-updatable display firmware via ISP. When replacing this obsolete part in a display module, the pin-compatible ATMEGA169P-16MU preserves the PCB layout exactly while providing improved process margin from the newer die revision.
Recommended
Consumer Appliances
Consumer appliance boards - coffee machines, fans, small heating controls - benefit from the ATMEGA169-16MU's single-chip integration: the AVR core handles user-interface state machines, the 10-bit ADC reads NTC temperature sensors on up to eight channels, and timers generate PWM for triac or relay drive. The 5V direct supply simplifies transformer-based power sections common in appliances, and 16KB flash accommodates generous UI and safety-check firmware. Its JTAG boundary-scan also assists production test of fine-pitch assemblies. For cost-sensitive high-volume refreshes, migrate to the active ATMEGA169PA-16MU to secure long-term supply while keeping the identical footprint and firmware binary.
Recommended
Analog Sensor Nodes
Distributed sensor nodes use the ATMEGA169-16MU as a compact acquisition engine: the 8-channel 10-bit ADC with internal reference support samples up to eight analog inputs, and on-chip EEPROM stores per-node calibration and network address data. The full-static core permits clocking far below 16MHz to cut active current, and the 2.7V floor matches LiFePO4 and dual-cell supplies. Flash self-programming enables field reconfiguration of sampling profiles over UART or other links. On the 64-QFN package, dedicate the exposed pad and adjacent vias to a clean analog ground to protect ADC accuracy; typically 1 LSB of noise budget is recoverable through careful ground partitioning alone.
Recommended
Legacy System Repair and Maintenance
Service organizations maintaining legacy ATmega169-based equipment need genuine 64-QFN devices to avoid PCB rework. The ATMEGA169-16MU remains procurable through Rochester Electronics on DigiKey Marketplace and aftermarket distributors such as Heisener (6,032 pieces listed as of 2026-09-16), keeping repair stock available. Where new-die parts are preferred, ATMEGA169P-16MU is pin-compatible and firmware-transparent per Microchip's family documentation, allowing board-level swap with only reflow equipment handling the exposed-pad QFN. Note the device programs via ISP or JTAG, so field firmware restoration is possible without desoldering when the programming header was populated.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA169-16MU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA169PA-16MU | ATMEGA169P-16MU | ATMEGA165P-16MU | ATMEGA165V-8MU |
|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm), exposed pad | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology (Atmel) |
| Program Memory | 16 KB FLASH | 16 KB FLASH | 16 KB FLASH | 16 KB FLASH | 16 KB FLASH |
| SRAM / EEPROM | 1 KB / 512 B | 1 KB / 512 B | 1 KB / 512 B | 1 KB / 512 B | 1 KB / 512 B |
| Maximum Clock Speed | 16 MHz (16 MIPS) | 16 MHz | 16 MHz | 16 MHz | 8 MHz (-50%) |
| Supply Voltage | 2.7 V to 5.5 V | 1.8 V to 5.5 V (PA picoPower) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Low-Power Features | Standard ATmega169 core | picoPower technology | Improved low-power die | P-variant low-power core | Standard core |
Key Differentiators
- Original-die availability for legacy service (vs ATMEGA169PA-16MU)
- Successor offers picoPower sleep currents (vs ATMEGA169PA-16MU)
- 16MHz performance in the 169 family line (vs ATMEGA165V-8MU)
Design Notes
The 64-QFN (9x9 mm) package has an exposed center pad that is the primary ground connection and thermal path. Design the land pattern with a corresponding central pad connected to the ground plane through an array of at least 9 via-in-pads (3x3) to ensure reliable solder wetting and low-inductance ground return. Per the datasheet mechanical drawing, use an NSMD pad geometry and a full no-clean no-wash reflow profile; hand rework with a soldering iron is not practical on this pitch. Verify stencil aperture design (typically 80-90% coverage on the center pad) to avoid voiding under the die paddle.
Decouple VCC and AVCC independently: place 100 nF ceramic capacitors within 2 mm of each VCC/AVCC pin pair, plus 4.7-10 uF bulk capacitance near the device. Connect AVCC to VCC through a low-pass filter (10 uH inductor or ferrite bead plus 100 nF) when ADC accuracy matters, and tie AREF to its own decoupling network - never connect AREF directly to a voltage source without series resistance when the internal reference is enabled, as this can short the internal reference amplifier. The 2.7V-5.5V range tolerates unregulated battery rails, but observe the frequency-versus-voltage derating curve in the datasheet if running 16MHz below 4.5V.
The ATMEGA169-16MU is discontinued: purchasing from unauthorized brokers risks reclaimed or counterfeit dies. Buy only through Rochester Electronics (authorized aftermarket, listed on DigiKey Marketplace) or vetted distributors, and plan migration to ATMEGA169P-16MU or ATMEGA169PA-16MU for future builds. Note also the die-revision difference: the original ATmega169 had documented errata (including JTAG-related issues) fixed in the P-variant; review Microchip's ATmega169 errata sheet against your firmware use of JTAG and EEPROM before locking designs to original-die remaining stock.
Compliance Information
Compliance status not stated in the provided verified web data. As a discontinued Atmel part, RoHS-compliant variants were marked with specific suffixes; confirm with Rochester Electronics or Microchip documentation for the exact compliance declaration of your lot.
