STMicroelectronics STM32F318K8U7

Overview

STM32F318K8U7 from STMicroelectronics is an Arm® Cortex®-M4 32-bit microcontroller with FPU, 64 KB Flash, 16 KB SRAM, integrated 12-bit DAC, three rail-to-rail comparators, and one programmable-gain operational amplifier. It operates at up to 72 MHz, supports 1.8 V ±8% supply, and targets analog-intensive embedded control applications such as motor drive feedback loops and sensor signal conditioning.

For engineers reviewing the STM32F318K8U7 datasheet, STM32F318K8U7 pinout, STM32F318K8U7 application, or STM32F318K8U7 equivalent, key selection factors include its dual analog supply domains (VDDA 1.65–3.6 V, VREF for ADC/DAC), 36 fast I/Os with interrupt mapping, WLCSP49 package footprint (3.417 × 3.151 mm), and integrated capacitive touch sensing for compact HMI designs.

Technical Context

The STM32F318K8U7 implements a tightly coupled Cortex-M4 core with single-cycle multiply and hardware divide, enabling real-time DSP operations in motor control and audio preprocessing. Its interconnect matrix routes DMA transfers between 7 peripherals-including ADC, DAC, timers, and SPI-without CPU intervention.

Analog subsystem integration includes independent supply rails: VDDA powers ADC/DAC/COMP/OPAMP (1.65–3.6 V), while dedicated VREF+ (2.4–3.6 V) ensures stable reference for 12-bit DAC output and 12/10/8/6-bit selectable ADC conversion across 0–3.6 V range.

Key Specifications

Pinout & Package

STM32F318K8U7 uses the WLCSP49 (Wafer Level Chip Scale Package) with 49 solder bumps arranged in a 7×7 array (center pad omitted), measuring 3.417 mm × 3.151 mm and featuring 0.4 mm pitch. This package supports high-density PCB layouts and requires controlled impedance routing for analog signal integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with STM32F318K8U7, STM32F303K8T6 trades analog integration for USB connectivity and larger package, while STM32G431K8U7 improves computational throughput but removes hardware comparators-making STM32F318K8U7 optimal for cost-sensitive, analog-dense applications needing deterministic sub-100 ns fault response.

Availability

STM32F318K8U7 is available at Aetrix Electronics and suitable for motor control feedback, sensor signal conditioning, capacitive touch interface, and industrial analog I/O modules requiring stable component supply across extended production lifecycles.

Supply support for STM32F318K8U7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, and analog/mixed-signal solutions for industrial, automotive, and consumer markets.

The STM32F3 series targets cost-sensitive, analog-rich embedded applications-emphasizing integrated op-amps, comparators, and high-resolution converters to reduce system-level component count and PCB area.

FAQ

What is the maximum operating frequency and supported voltage range for STM32F318K8U7?

The STM32F318K8U7 operates at up to 72 MHz using its internal PLL and requires a 1.8 V ±8% digital supply (VDD). The analog supply (VDDA) ranges from 1.65 V to 3.6 V, and the DAC/OPAMP reference (VREF+) accepts 2.4–3.6 V-enabling stable analog performance across varying input conditions without external regulators.

Does STM32F318K8U7 support hardware-accelerated cryptographic functions?

No, the STM32F318K8U7 does not include dedicated cryptographic accelerators such as AES, SHA, or PKA engines. It relies on software libraries for encryption tasks. For hardware crypto support, consider STM32L4 or STM32H7 series MCUs with CryptoCell or HASH/AES peripherals.

Can the integrated op-amp be used in transimpedance configuration for photodiode signal conditioning?

Yes-the OPAMP's fully accessible terminals (non-inverting input, inverting input, output) and rail-to-rail operation allow direct transimpedance amplifier implementation. With VREF+ ≥2.4 V and bandwidth >1 MHz, it supports photodiode currents up to ~100 µA while maintaining linearity and low noise in optical sensor front-ends.

What debug interfaces are supported, and is SWD compatible with standard ST-LINK tools?

The STM32F318K8U7 supports Serial Wire Debug (SWD) only-not JTAG-and is fully compatible with ST-LINK/V2 and ST-LINK/V3 debug probes. SWD uses two pins (SWDIO and SWCLK) and enables full flash programming, breakpoint debugging, and real-time memory/register inspection without requiring additional hardware.