STMicroelectronics

STM32F103ZCT7 - 72MHz 256KB Cortex-M3 MCU | STMicroelectronics

Артикул: STM32F103ZCT7 ✓ Активен
В наличии Отправка в течение 1–3 рабочих дней
2.5 V / 3.3 V Vdss 144-pin LQFP Package 72 MHz Speed 256 KB Memory
От $7.65 USD / шт.
MOQ: 1 |
Цена обновлена: 2026-10-21
Оптовые цены
Кол-во Цена за ед. Итого
1 $12.95 $12,95
10 $11.8 $118,00
100 $10.45 $1.045,00
500 $8.9 $4.450,00
1.000 $7.65 $7.650,00
ℹ️ Все цены указаны в USD

STM32F103ZCT7 Обзор

The STMicroelectronics STM32F103ZCT7 is a 32-bit ARM Cortex-M3 microcontroller operating up to 72 MHz with 256 KB of Flash memory in a 144-pin LQFP package. It is designed for high-density embedded systems that need broad peripheral connectivity, deterministic control, and substantial on-chip program memory.

What is an ARM Cortex-M3 microcontroller? An MCU combines a processor core, memory, and peripherals on one integrated circuit. The Cortex-M3 core provides a 32-bit instruction set and RISC-oriented embedded architecture, while the STM32F103 family integrates communication, timing, analog, and digital-control resources for applications spanning industrial equipment, communications, and mixed-signal control.

The STM32F103ZCT7 combines 72 MHz operation, 256 KB Flash, and a high pin count in one device. Verified distributor material also identifies the part as a 144-pin MCU and highlights USB, CAN, timer, ADC, and communication-interface resources. These peripherals make it suitable for systems combining control logic with protocol handling and analog measurement.

The STM32F103ZCT7 belongs to the STM32F103 high-density performance line. Its architecture supports connected embedded designs that need more GPIO and peripheral capacity than smaller STM32 packages. The 144-pin LQFP format provides extensive external connectivity, while the Cortex-M3 platform supports established embedded software tooling and real-time control workloads.

Typical applications include industrial controllers, USB-connected peripherals, CAN-based equipment, data-acquisition systems, timer-driven control platforms, and embedded communications equipment. In these systems, the microcontroller can coordinate sensors, actuators, protocol transceivers, and human-interface or debug connections through its broad pin and peripheral set.

A key design consideration is supply and decoupling planning. The verified data identifies 2.5 V and 3.3 V device variants, but detailed voltage ranges, pin-level electrical limits, clock configuration, memory map, and exact peripheral ratings were not supplied here and should be confirmed in the manufacturer datasheet before layout or firmware release. Firmware migration also requires validation of startup files, peripheral behavior, timing, and toolchain support.

This page combines verified distributor specifications, practical application context, package constraints, and sourcing guidance for engineers evaluating the STM32F103ZCT7. It is designed to make technical comparisons faster while clearly separating confirmed data from parameters that require datasheet verification.

Аналоги без доработки для STM32F103ZCT7 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.

Варианты в этой серии

Модели той же серии, совместимые без доработки с STM32F103ZCT7 (тот же форм-фактор и посадочное место) — отличается по Flash Organization, Mounting Type, Package.

STMicroelectronics
Flash Organization: 512K x 8
Mounting Type: Surface Mount
Package: 144-LQFP
Сравнить с STM32F103ZCT7 →

Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:

GD32F103ZCT6

✅ Прямая замена
📦 144-pin LQFP
Pin-compatible STM32F103 migration candidate; verified migration material reports up to 108 MHz versus STM32F103ZCT7 at 72 MHz, with firmware and peripheral behavior requiring validation

📋 Справочный аналог (нет в каталоге)

GD32F103ZET6

✅ Прямая замена
📦 144-pin LQFP
Pin-compatible STM32F103-family candidate; exact memory and suffix-specific electrical differences require comparison with STM32F103ZCT7

📋 Справочный аналог (нет в каталоге)

GD32F103RCT6

✅ Прямая замена
📦 144-pin LQFP
Same-package STM32F103 migration candidate; suffix-specific Flash, temperature, and peripheral configuration must be verified before substitution

📋 Справочный аналог (нет в каталоге)

STM32F103ZBT7

✅ Прямая замена ⚠️ Характеристики не проверены
📦 144-pin LQFP
Same manufacturer and STM32F103 family, but Flash-memory suffix differs; exact memory and feature differences require datasheet confirmation

📋 Справочный аналог (нет в каталоге)

STM32F103ZDT7

✅ Прямая замена ⚠️ Характеристики не проверены
📦 144-pin LQFP
Same manufacturer and 144-pin family, with suffix-specific Flash configuration requiring verification against STM32F103ZCT7

📋 Справочный аналог (нет в каталоге)

STM32F103ZCT7 Максимальные параметры и электрические характеристики

Product Type 32-bit ARM Cortex-M3 microcontroller
Максимальная тактовая частота 72 MHz
Flash Memory 256 KB
Flash Organization 256K x 8 bits
Processor Architecture ARM Cortex-M3
Instruction Width 32-bit
Корпус 144-pin LQFP
Supply Voltage Variant 2.5 V / 3.3 V
Communication Interfaces 13 communication interfaces
Timers 11 timers
ADC Resources 3 ADCs
USB Support USB
CAN Support CAN
Application Focus Mixed-signal and timer-driven control
Тип монтажа Surface-mount LQFP

Руководство по цоколевке STM32F103ZCT7 в корпусе 144-pin lqfp

Цоколевка для STM32F103ZCT7 (корпус 144-pin lqfp). Эта цифровая ИС включает выводы GPIO, интерфейсы связи (UART, SPI, I2C) и выводы питания. Обратитесь к техническому описанию производителя для альтернативных функций выводов и вариантов конфигурации. Необходимо для проектирования встраиваемых систем и трассировки печатных плат.

Схема цоколевки корпуса 144-pin lqfp для STM32F103ZCT7

Нет подробных данных о распиновке для STM32F103ZCT7.

Обратитесь к даташиту для полной конфигурации выводов.

Типичное применение

STM32F103ZCT7 подходит для 6 применениеs: Industrial Control Systems, CAN-Connected Equipment, USB-Connected Embedded Products, Data-Acquisition and Monitoring, Timer-Driven Motor and Actuator Control, Human Interface and Embedded Networking Gateway.

🏭

Industrial Control Systems

STM32F103ZCT7 fits industrial controllers that combine real-time control with multiple external signals. Its verified 72 MHz Cortex-M3 core provides computational headroom for control logic, while the 144-pin LQFP package exposes a large number of connections for digital inputs, outputs, actuators, and status indicators. The family’s 11 timers and 3 ADCs are useful for periodic sequencing, sensing, and mixed-signal monitoring. A practical design would use dedicated CAN or network transceivers where required, isolated interfaces where required by the installation, and careful grounding between high-current actuator paths and low-level measurement circuits.

🌐

CAN-Connected Equipment

The STM32F103ZCT7 is suitable for CAN-connected embedded equipment because the verified STM32F103 family listing identifies CAN support and a broad set of communication interfaces. The MCU can manage a communications protocol while timers handle periodic scheduling and ADCs provide local analog monitoring. In a practical node, the STM32F103ZCT7 would connect through a suitable CAN transceiver rather than directly to a bus. Board design must account for transceiver supply, termination, isolation requirements, common-mode voltage, ESD protection, and firmware timing. Because the supplied data does not specify CAN mode, baud-rate range, or transceiver pin mapping, those values must be taken from the official datasheet and selected transceiver documentation.

🔌

USB-Connected Embedded Products

STM32F103ZCT7 can support USB-connected embedded products because USB is explicitly identified in the verified family description. The 72 MHz Cortex-M3 core is appropriate for combining protocol handling with application logic, while the 144-pin package leaves ample I/O for user controls, indicators, sensors, and external actuators. The USB implementation should be designed with the correct connector, protection, routing, and power-supply strategy for the target product. USB speed, device or host role, endpoint count, and exact alternate-function pins are not included in the supplied data and must be verified from the manufacturer datasheet before schematic capture.

📊

Data-Acquisition and Monitoring

The verified STM32F103 family resources of 3 ADCs and 11 timers make STM32F103ZCT7 a reasonable platform for data-acquisition and monitoring equipment. The high pin count can reduce multiplexing pressure when several sensors, amplifiers, and digital interfaces must coexist. ADCs can be paired with external signal conditioning while timers provide periodic sampling, filtering windows, or trigger coordination. The supplied information does not specify ADC resolution, input count, sample rate, reference voltage, or analog input impedance, so those details must be confirmed before selecting sensor amplifiers or defining measurement accuracy. Layout should separate analog and digital return paths and provide local decoupling near the MCU supply pins.

⚙️

Timer-Driven Motor and Actuator Control

STM32F103ZCT7 fits timer-driven control platforms where the MCU must coordinate multiple timing events and external actuators. The verified 72 MHz operating point provides processing capacity for scheduling and supervisory logic, while 11 timers support the family’s broad timing resource set. A practical motor-control system would also require power transistors, gate drivers, current sensing, protection, and a defined safety strategy. The supplied data does not identify timer channel counts, PWM frequency limits, encoder interfaces, or motor-control peripherals, so engineers must verify those details in the manufacturer datasheet. Use independent hardware shutdown paths where a software fault could otherwise leave an actuator energized.

🖥️

Human Interface and Embedded Networking Gateway

The STM32F103ZCT7 is suitable for embedded gateways that connect local controls to USB, CAN, or other communication interfaces. Its 144-pin LQFP package provides a high pin count for status LEDs, buttons, displays, configuration interfaces, and external protocol converters. The Cortex-M3 core and verified family peripherals allow application firmware, protocol handling, and supervisory control to share one device. A production design should include watchdog behavior, boot protection, firmware update strategy, connector protection, and defined recovery behavior after communication faults. The verified data does not include security peripherals or exact memory protections, so those requirements must be reviewed before exposing the device to untrusted networks.

Сводка рекомендуемых товаров

ADM485ARZ Analog Devices Используется в: Industrial Control Systems, CAN-Connected Equipment, Human Interface and Embedded Networking Gateway MC9S08GT60ACFBER NXP Semiconductors Используется в: Industrial Control Systems MKE02Z32VQH4 NXP Semiconductors Используется в: Industrial Control Systems MC908JL8CDWER NXP Semiconductors Используется в: CAN-Connected Equipment VIPER26LD STMicroelectronics Используется в: CAN-Connected Equipment, Timer-Driven Motor and Actuator Control USB2513B-AEZC Microchip Technology Используется в: USB-Connected Embedded Products, Human Interface and Embedded Networking Gateway ADM3202ARNZ Analog Devices Используется в: USB-Connected Embedded Products MCF51JE256CMB NXP Semiconductors Используется в: USB-Connected Embedded Products MCP3208-I/SL External ADC companion for additional analog channels Используется в: Data-Acquisition and Monitoring MCF51AG128CLF NXP Semiconductors Используется в: Data-Acquisition and Monitoring S912XDT256F1VAA NXP Semiconductors Используется в: Data-Acquisition and Monitoring MCF51JE256VML NXP Semiconductors Используется в: Timer-Driven Motor and Actuator Control MC56F8255MLD NXP Semiconductors Используется в: Timer-Driven Motor and Actuator Control MC9S12D32MFUE NXP Semiconductors Используется в: Human Interface and Embedded Networking Gateway
What are the key specifications of STM32F103ZCT7 that engineers should know?
The STM32F103ZCT7 is a 32-bit ARM Cortex-M3 microcontroller rated up to 72 MHz, with 256 KB of Flash memory and a 144-pin LQFP package. Verified distributor listings also identify 13 communication interfaces, 11 timers, 3 ADCs, USB, and CAN support. The device is positioned for high-density mixed-signal and timer-driven embedded systems. According to the verified STM32F103ZCT7 product listings, the part uses a 32-bit ARM Cortex-M3 core and provides 256K x 8 Flash organization. Exact SRAM, GPIO, voltage-range, and temperature details should be checked in the manufacturer datasheet before final design release.
What is the operating frequency of STM32F103ZCT7?
The STM32F103ZCT7 operates at up to 72 MHz according to the verified DigiKey and Mouser product descriptions. This Cortex-M3 performance is suitable for real-time control, communication handling, and mixed-signal embedded tasks. The verified data does not provide the complete clock-tree configuration, peripheral clock limits, or timing margins, so those details must be confirmed in the manufacturer datasheet. Designers should also validate startup and clock settings in the selected firmware configuration.
How much Flash memory does STM32F103ZCT7 have?
The STM32F103ZCT7 contains 256 KB of Flash memory, specified in the verified distributor material as 256K x 8 bits. This capacity supports larger embedded applications, protocol stacks, control firmware, and configuration data. The verified source does not state the SRAM size, flash endurance, or wait-state requirements, so those parameters should be obtained from the manufacturer datasheet. Firmware partitioning and bootloader design should therefore be completed only after reviewing the verified memory architecture.
What package does STM32F103ZCT7 use?
The STM32F103ZCT7 is supplied in a 144-pin LQFP package according to Mouser and other verified distributor listings. The large pin count supports extensive GPIO and peripheral connectivity for high-density embedded designs. The verified material identifies the package as LQFP, while the exact body size, pin pitch, exposed-pad details, and recommended land pattern were not supplied. Those mechanical values must be checked against the official package drawing before PCB release.
Does STM32F103ZCT7 support USB and CAN?
Yes. The verified STM32F103 family listings identify USB and CAN among the device capabilities. These interfaces can support USB-connected peripherals, CAN-based industrial equipment, and embedded communication bridges. However, the verified data does not specify USB speed, CAN operating mode, transceiver requirements, pin multiplexing, or peripheral clock requirements. Those electrical and protocol details should be confirmed in the manufacturer datasheet and validated against the selected board-level transceivers.
What communication and timing resources are available on STM32F103ZCT7?
The verified family description identifies 13 communication interfaces, 11 timers, and 3 ADCs for the STM32F103 high-density platform. These resources support simultaneous control, measurement, timing, and protocol tasks in embedded systems. The specific interface list, timer channels, ADC resolution, sampling rates, and alternate-function mappings are not included in the supplied data. Engineers should consult the manufacturer datasheet and pinout documentation before assigning signals or allocating peripheral resources.
Where can I download the STM32F103ZCT7 datasheet PDF?
The manufacturer datasheet should be used as the authoritative source for STM32F103ZCT7 electrical limits, pinout, memory, clock, and peripheral details. The verified data provides a datasheet landing page at Datasheets.com and links to an STMicroelectronics STM32F103ZCT7XXX PDF at Alldatasheet. Because the supplied material does not include a verified manufacturer-controlled PDF URL, the datasheet document number and revision must not be inferred. Download the current official STMicroelectronics document before design sign-off.
Where can I find the STM32F103ZCT7 pinout?
The STM32F103ZCT7 pinout should be taken from the manufacturer’s official 144-pin LQFP package drawing and datasheet. The verified distributor results confirm a 144-pin package but do not provide the complete numbered pin list. Because the supplied data does not expose pin numbers or names, the exact pinout cannot be reconstructed without risking errors. Use the official pinout for power, ground, oscillator, reset, programming, GPIO, and peripheral connections.
What can replace the STM32F103ZCT7?
The STM32F103ZCT7 can be evaluated against compatible Cortex-M3 devices such as GigaDevice GD32F103 variants, but a replacement is only drop-in after package, pin, memory, peripheral, clock, electrical, and software compatibility are verified. The supplied cross-reference results specifically identify GD32F103 as a common pin-compatible alternative and note differences such as 108 MHz versus 72 MHz operation. No verified alternative with the exact 144-pin STM32F103ZCT7 footprint and confirmed full compatibility was provided, so production substitution requires engineering review.
Is GigaDevice GD32F103 a drop-in replacement for STM32F103ZCT7?
GigaDevice GD32F103 is a relevant candidate for STM32F103 migration, but it should not be treated as an unconditional drop-in replacement. The verified migration material identifies pin compatibility and notes a 108 MHz versus 72 MHz difference for at least one comparison. Peripheral behavior, memory sizing, voltage limits, startup code, toolchain support, and certification must also be checked. The supplied data does not confirm that a specific GD32F103 MPN is available in the exact 144-pin LQFP package, so board-level validation is required.
STM32F103ZCT7 vs GD32F103: which is better for a new design?
STM32F103ZCT7 is the safer choice when existing firmware, tooling, qualification, and ecosystem compatibility are priorities. GD32F103 may be attractive when sourcing and pricing need a second-source strategy, and verified migration material reports pin compatibility and higher clock capability in some variants. The decision depends on exact package, memory, peripheral, electrical, and software compatibility. Because the supplied data does not establish five exact drop-in replacements, engineers should prototype and validate any migration rather than rely on headline specifications alone.
What are the main differences between STM32F103ZCT7 and STM32F103ZET6?
The supplied verified data does not include STM32F103ZET6 specifications, so a quantified comparison cannot be made without risking fabrication. Both names belong to the STM32F103 high-density family, but package, Flash size, temperature grade, and order-code suffix must be compared exactly. Engineers should verify the manufacturer datasheet for each MPN before treating either part as a substitute. Do not infer that similar STM32F103 names are pin-compatible without checking the official package drawing and electrical tables.
When should I choose STM32F103ZCT7 over a GD32F103 alternative?
Choose STM32F103ZCT7 when your design is already optimized around its 72 MHz Cortex-M3 platform, 256 KB Flash, 144-pin LQFP footprint, and established STMicroelectronics software ecosystem. Choose a GD32F103 candidate only after confirming the exact package and pin mapping, then retest clocking, USB, CAN, timers, ADCs, startup behavior, and production firmware. The supplied migration material reports GD32F103 compatibility potential, but it does not establish unconditional drop-in equivalence for this exact MPN.
Is STM32F103ZCT7 suitable for industrial control and CAN systems?
STM32F103ZCT7 is a strong candidate for industrial control and CAN-connected equipment because the verified family data identifies CAN, USB, 11 timers, 3 ADCs, and 13 communication interfaces. The 144-pin LQFP package also provides a high pin count for external interfaces. Actual suitability depends on operating-temperature grade, supply range, isolation, transceiver selection, ESD protection, watchdog strategy, and environmental qualification, none of which are fully specified in the supplied data. Confirm those requirements in the official datasheet before deployment.
How much does STM32F103ZCT7 cost and where can I buy it?
The verified distributor listings identify DigiKey, Mouser, DiGi-Electronics, and other sellers as sources for STM32F103ZCT7, but the supplied snippets do not provide numeric prices or confirmed stock quantities. XAIPART tiers are provided as reference pricing and must be treated as current commercial data requiring confirmation at quote time. The best purchasing approach is to compare authorized distributor pricing, stock, lead time, and traceability. A distributor page does not by itself prove that inventory is available at the moment of order.
What is the lead time for STM32F103ZCT7?
The verified search results show that STM32F103ZCT7 is offered by multiple distributors, but they do not provide a reliable numeric lead time or guarantee current inventory. Lead time can change with regional stock, authorized-channel status, and manufacturing conditions. Request a written quotation and stock confirmation from the selected distributor before committing a production schedule. If supply risk is important, qualify a second source only after verifying package, pin, firmware, peripheral, and qualification compatibility.
Is STM32F103ZCT7 RoHS and AEC-Q100 compliant?
The supplied verified data does not state the RoHS, REACH, or AEC-Q100 status of STM32F103ZCT7, so those claims cannot be confirmed from the available evidence. RoHS and REACH documentation should be obtained from STMicroelectronics or the authorized distributor, while AEC-Q100 qualification applies only when the exact orderable part is explicitly qualified. The compliance fields therefore remain unknown or not applicable until supporting manufacturer documentation is available.

Справочные инженерные данные для STM32F103ZCT7 — сравнение, рекомендации по проектированию и информация о соответствии.

Руководство по выбору

Choose STM32F103ZCT7 when the design benefits from a documented STMicroelectronics STM32F103 Cortex-M3 platform, 256 KB Flash, 72 MHz operation, and a high-density 144-pin LQFP footprint. It is particularly suitable when existing firmware, tooling, qualification, and peripheral expectations are already aligned with STMicroelectronics. Consider a GD32F103 candidate only when supply or cost pressure justifies migration and the exact package, memory, peripherals, clocking, electrical limits, and firmware behavior have been validated. Do not substitute a similarly named STM32F103 suffix without confirming its order-code configuration. The supplied cross-reference results identify GD32F103 as a migration candidate, but they do not prove five exact drop-in replacements for this target.

Сравнение с аналогами

Параметр Этот товар GD32F103ZCT6 GD32F103ZET6 GD32F103RCT6 STM32F103ZBT7
Brand STMicroelectronics GigaDevice GigaDevice GigaDevice STMicroelectronics
Package 144-pin LQFP 144-pin LQFP 144-pin LQFP 144-pin LQFP 144-pin LQFP
Processor Core ARM Cortex-M3 Cortex-M3 family migration candidate Cortex-M3 family migration candidate Cortex-M3 family migration candidate STM32F103 family

Ключевые отличия

  • Established STMicroelectronics STM32F103 platform with a verified 72 MHz Cortex-M3 configuration (против GD32F103ZCT6)
  • High-density 144-pin LQFP interface capacity (против STM32F103ZBT7)
  • Verified integrated connectivity for embedded control (против GD32F103RCT6)

Заметки по проектированию

Use the verified 2.5 V and 3.3 V device-variant information as the starting point, then confirm the exact operating and absolute-maximum voltage ranges in the manufacturer datasheet. Place the required supply and bypass capacitors close to the corresponding power pins, with separate return paths for digital and analog loads. High-current actuators should not share narrow supply traces with sensitive measurement circuitry; use local regulation or filtering where the load can create large transients.

The 144-pin LQFP footprint gives the design many signals, but pin assignment must be checked against the official STM32F103ZCT7 pinout rather than inferred from package size. Reserve oscillator, reset, programming, power, ground, and debug connections according to the manufacturer recommendations. Confirm the mechanical drawing, pin pitch, body dimensions, and land pattern before fabrication, and maintain clearance between high-current switching paths and analog ADC inputs.

Do not treat a similar STM32F103 or GD32F103 order code as a drop-in substitute solely because the names are similar. Verify Flash size, SRAM, voltage range, temperature grade, pin multiplexing, USB and CAN behavior, timers, ADCs, clock limits, and firmware startup requirements. The supplied migration material reports GD32F103 compatibility potential and a 108 MHz versus 72 MHz difference, so timing and peripheral behavior should be revalidated before production release.

The verified data identifies USB, CAN, 11 timers, 3 ADCs, and 13 communication interfaces, but it does not provide complete operating details for each peripheral. Confirm alternate-function mapping, interrupt priorities, DMA behavior, timer channel assignments, and communication electrical requirements in the official documentation. Add a recovery path for firmware faults and use a hardware shutdown mechanism for actuators so a software failure cannot create an unsafe energized state.

Информация о соответствии

RoHS
Unknown
REACH
Unknown
AEC-Q100
Unknown
Без свинца
Unknown
Без галогенов
Unknown
Конфликтные минералы
Unknown

The supplied verified data does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Obtain current compliance documentation from STMicroelectronics or an authorized distributor for the exact orderable MPN.

Данные проверены: 2026-10-21 — данные проверены и курируются командой компонентной инженерии XAIPART

Похожие запросы

STM32F103ZCT7 STM32F103ZCT7 datasheet STM32F103ZCT7 STMicroelectronics STM32F103ZCT7 72MHz 256KB STM32F103ZCT7 144-pin LQFP STM32F103ZCT7 USB CAN microcontroller STM32F103ZCT7 vs GD32F103 STM32F103ZCT7 drop-in replacement STM32F103ZCT7 buy online STM32F103ZCT7 price STM32F103ZCT7 lead time STM32F103ZCT7 pinout Cortex-M3 microcontroller 144 pin LQFP STM32F103 industrial control CAN

Связанные компоненты & термины

STMicroelectronics STM32F103ZCT7 STM32F103 ARM Cortex-M3 Cortex-M3 RISC architecture 32-bit microcontroller MCU semiconductor 72 MHz 256 KB Flash 144-pin LQFP LQFP package surface mount USB CAN ADC timers communication interfaces GD32F103 GigaDevice industrial control embedded systems mixed-signal control
Быстрый запрос цены (RFQ)
Заполните все данные — наша команда продаж ответит в течение 24 часов
Артикул Производитель Корпус QTY Целевая цена Итого
Итого: $0.00 USD
✓
Запрос цены отправлен!

Мы ответим на ваш email в течение 24 часов

1
RFQ отправлен
2
Предложение получено
3
Заказ оформлен
4
Оплата
5
Отправлено
6
Доставлено
Просмотреть детали RFQ