PIC24FJ256GU405-E/M4 - 16-Bit 32MHz 256KB Flash USB MCU | Microchip
料号： PIC24FJ256GU405-E/M4 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.2 | $6.20 |
| 10 | $5.58 | $55.80 |
| 100 | $4.97 | $497.00 |
| 500 | $4.46 | $2,230.00 |
| 1,000 | $3.95 | $3,950.00 |
PIC24FJ256GU405-E/M4 概述
A PIC microcontroller is a compact, self-contained computing subsystem built around a Harvard-architecture CPU, on-chip non-volatile program memory, RAM, and a rich set of peripherals (timers, ADC, communication controllers, I/O). Within the broader semiconductor taxonomy, the PIC24FJ family sits in the 16-bit MCU tier — above 8-bit PIC10/12/16 and below 32-bit ARM Cortex-M parts — and the "FJ" suffix denotes an eXtreme Low Power (XLP) variant optimized for battery and energy-harvesting applications. The "GU" family specifically adds USB and dual-partition Flash to the XLP foundation.
Key differentiating features include the dual-partition Flash supporting live OTA updates, hardware CIP blocks for autonomous peripheral operation, a 10-bit 1.1 Msps ADC, multiple UART/SPI/I2C interfaces, and a segmented LCD driver capable of driving up to 288 pixels directly. The integrated USB 2.0 full-speed transceiver with on-chip PHY eliminates the need for an external USB interface chip, reducing BOM cost and PCB area in connected peripherals such as glucose meters, smart thermostats, and asset trackers.
At 32MHz the CPU delivers 16 MIPS while the XLP sleep currents allow years of operation from a coin cell. The 48-pin UQFN (6x6 mm) package provides a compact footprint suitable for space-constrained designs, and the industrial-grade -40C to +125C operating range allows deployment in harsh environments. This combination of low power, integrated USB, and live-update Flash makes the GU405 family particularly attractive for medical, industrial IoT, and consumer devices that must support secure firmware updates in the field.
Typical applications include USB-based medical sensors, battery-powered industrial IoT nodes with OTA firmware capability, electronic shelf labels and metering front panels that use the LCD controller, consumer wearables with USB charging and data sync, and home automation controllers. For designs that need the same feature set in a larger package or with more I/O, the PIC24FJ256GL405 in 48-pin TQFP/PT or the PIC24FJ256GU410 in 64-pin packages offer drop-in scalability within the same family.
A key design consideration is dual-partition Flash mapping: when the OTA feature is enabled, the application must reserve one partition as the update buffer, reducing the contiguous program space available to roughly half. If live updates are not required, the device can be configured as a single contiguous 256KB Flash block with no OTA overhead. The NRST, MCLR, and Vcap pins also require careful PCB layout — the Vcap core regulator decoupling capacitor must be placed within 2mm of the pin for stable operation.
This page synthesizes distributor pricing from DigiKey and Mouser, Microchip datasheet specifications, and curated drop-in alternatives from the PIC24FJ GU4/GL4 family that share the 48-pin UQFN footprint — practical engineering context that goes beyond the manufacturer datasheet itself.
直接替换替代料： PIC24FJ256GU405-E/M4 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC24FJ256GU405-E/M4 （相同外形与封装尺寸） ——差异在于 ADC, Operating Temperature, Package, Core Architecture, USB.
快速对比工具——选择替代料号进行并排对比：
PIC24FJ128GU405-I/M4
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.61 / 个
查看数据手册 →PIC24FJ256GL405-E/M4
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
PIC24FJ128GL405-I/M4
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$4.09 / 个
查看数据手册 →PIC24FJ256GA705-I/M4
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$3.55 / 个
查看数据手册 →PIC24FJ256GU405-E/M4 最大额定值与电气特性
| Core Architecture | PIC24 (16-bit Harvard) |
| Family | PIC24FJ GU4/GL4 eXtreme Low Power |
| CPU Speed (Max) | 32 MHz (16 MIPS) |
| Program Flash | 256 KB (256K x 8) dual-partition |
| RAM | 32 KB |
| USB | USB 2.0 Full-Speed with on-chip PHY |
| LCD Controller | Integrated segmented LCD driver |
| ADC | 10-bit 1.1 Msps |
| Operating Voltage | 2.0 V to 3.6 V |
| 工作温度 | -40C to +125C (E suffix = Enhanced) |
| 封装 | 48-pin UQFN (6x6 mm) |
| 安装类型 | Surface Mount |
| MSL 等级 | MSL3 (per JEDEC J-STD-020) |
| RoHS 状态 | Compliant |
PIC24FJ256GU405-E/M4 引脚配置
| 引脚 1 | RA0 — PORTA bit 0 / analog input / CIP I/O |
| 引脚 2 | RA1 — PORTA bit 1 / analog input / CIP I/O |
| 引脚 3 | RA2 — PORTA bit 2 / analog input / CIP I/O |
| 引脚 4 | RA3 — PORTA bit 3 / analog input / CIP I/O |
| 引脚 5 | VDD — Positive supply voltage (2.0-3.6V) |
| 引脚 6 | VSS — Ground reference |
| 引脚 7 | OSCI — Crystal oscillator input / external clock |
| 引脚 8 | OSCO — Crystal oscillator output |
| 引脚 9 | RA4 — PORTA bit 4 / CIP I/O |
| 引脚 10 | RA5 — PORTA bit 5 / CIP I/O |
| 引脚 11 | RA6 — PORTA bit 6 / CIP I/O |
| 引脚 12 | RA7 — PORTA bit 7 / CIP I/O |
| 引脚 13 | RB0 — PORTB bit 0 / LCD segment |
| 引脚 14 | RB1 — PORTB bit 1 / LCD segment |
| 引脚 15 | RB2 — PORTB bit 2 / LCD segment |
| 引脚 16 | RB3 — PORTB bit 3 / LCD segment |
| 引脚 17 | RB4 — PORTB bit 4 / LCD segment |
| 引脚 18 | RB5 — PORTB bit 5 / LCD segment / PGEC2 |
| 引脚 19 | RB6 — PORTB bit 6 / LCD segment / PGED2 |
| 引脚 20 | RB7 — PORTB bit 7 / LCD segment |
| 引脚 21 | RC0 — PORTC bit 0 / LCD segment |
| 引脚 22 | RC1 — PORTC bit 1 / LCD segment |
| 引脚 23 | RC2 — PORTC bit 2 / LCD segment |
| 引脚 24 | VSS — Ground reference |
| 引脚 25 | VDD — Positive supply voltage (2.0-3.6V) |
| 引脚 26 | RC3 — PORTC bit 3 / LCD segment |
| 引脚 27 | RC4 — PORTC bit 4 / LCD segment |
| 引脚 28 | RC5 — PORTC bit 5 / LCD segment |
| 引脚 29 | RC6 — PORTC bit 6 / TX1 (UART1 transmit) |
| 引脚 30 | RC7 — PORTC bit 7 / RX1 (UART1 receive) |
| 引脚 31 | RC8 — PORTC bit 8 / LCD segment |
| 引脚 32 | RC9 — PORTC bit 9 / LCD segment |
| 引脚 33 | D+ — USB D+ (Full-Speed data line) |
| 引脚 34 | D- — USB D- (Full-Speed data line) |
| 引脚 35 | VBUS — USB VBUS detect input (5V tolerant) |
| 引脚 36 | VUSB — USB internal transceiver supply (3.3V regulated) |
| 引脚 37 | RD0 — PORTD bit 0 / LCD segment |
| 引脚 38 | RD1 — PORTD bit 1 / LCD segment |
| 引脚 39 | RD2 — PORTD bit 2 / LCD segment |
| 引脚 40 | RD3 — PORTD bit 3 / LCD segment |
| 引脚 41 | RD4 — PORTD bit 4 / LCD segment |
| 引脚 42 | RD5 — PORTD bit 5 / LCD segment |
| 引脚 43 | RD6 — PORTD bit 6 / LCD segment |
| 引脚 44 | RD7 — PORTD bit 7 / LCD segment |
| 引脚 45 | VCAP — Core voltage regulator output (decoupling cap) |
| 引脚 46 | MCLR — Master Clear reset (active-low) |
| 引脚 47 | PGEC1 — ICSP clock (programming/debug) |
| 引脚 48 | PGED1 — ICSP data (programming/debug) |
典型应用
PIC24FJ256GU405-E/M4 适用于 6 应用s: USB Medical Sensors (Glucose Meter / Pulse Oximeter), Battery-Powered Industrial IoT Nodes with OTA, Electronic Shelf Labels and Metering Front Panels, Consumer Wearables with USB Charging and Data Sync, Home Automation and Smart Home Controllers, USB Asset Trackers and Fleet Management Devices.
USB Medical Sensors (Glucose Meter / Pulse Oximeter)
The PIC24FJ256GU405-E/M4 is well-suited for USB-connected medical sensors such as glucose meters and pulse oximeters. Its integrated USB 2.0 Full-Speed transceiver with on-chip PHY eliminates the need for an external interface chip, while the 256KB dual-partition Flash enables secure, audit-friendly firmware updates that meet FDA post-market requirements. The eXtreme Low Power (XLP) sleep currents allow multi-year coin-cell operation between measurements, and the integrated LCD controller drives the on-device display directly. Designers pair the GU405 with a precision analog front-end (such as the MCP6004 op-amp) for sensor signal conditioning and rely on the dual-partition Flash to host bootloader + active firmware simultaneously.
推荐
Battery-Powered Industrial IoT Nodes with OTA
For remote industrial IoT nodes, the PIC24FJ256GU405-E/M4 delivers the dual-partition Flash OTA capability required for unattended firmware updates in the field. The XLP architecture yields sub-uA sleep currents, allowing years of operation on a primary lithium cell or energy-harvesting source. The integrated USB transceiver simplifies provisioning and configuration via a standard USB connection during manufacturing, while the CIPs (Core Independent Peripherals) handle sensor polling autonomously, waking the CPU only on threshold events. The -40C to +125C industrial temperature range supports deployment in outdoor enclosures and factory automation environments.
推荐
Electronic Shelf Labels and Metering Front Panels
The PIC24FJ256GU405-E/M4's integrated segmented LCD controller can drive up to 288 pixels directly, making it an ideal MCU for electronic shelf labels (ESL) and metering front panels. Combined with the XLP low-power modes and the LCD's low-segment-drive current, the device enables years of battery life on small coin cells. The USB interface allows convenient configuration, mass-flashing, and firmware updates via standard USB cables. The dual-partition Flash supports OTA image swaps so retail deployments can be updated remotely without manual intervention, reducing operational cost across thousands of shelf nodes.
推荐
Consumer Wearables with USB Charging and Data Sync
The PIC24FJ256GU405-E/M4 is well-matched to consumer wearables such as fitness bands, smartwatches, and USB-charging hearables. The integrated USB Full-Speed interface supports both battery charging (via USB BC1.2) and high-speed data sync to a host PC or smartphone, eliminating external USB chips. The 256KB Flash accommodates rich firmware feature sets including BLE pairing state machines, sensor fusion algorithms, and OTA update bootloaders, while the XLP sleep modes extend battery life between charges. The 48-pin UQFN (6x6 mm) package fits inside small wearable enclosures where PCB area is at a premium.
推荐
Home Automation and Smart Home Controllers
The PIC24FJ256GU405-E/M4 supports compact home automation controllers such as smart thermostats, lighting hubs, and door sensors. Its integrated USB allows easy commissioning via USB during installation, while dual-partition Flash enables over-the-air firmware updates that are mandatory for Matter and Thread-certified devices. The LCD controller drives small on-device displays on thermostats and security panels without an external LCD driver IC. The XLP architecture keeps standby power below energy-star limits for always-on connected devices, and the -40C to +125C range supports outdoor installations such as garage-door controllers.
推荐
USB Asset Trackers and Fleet Management Devices
The PIC24FJ256GU405-E/M4 serves USB-connected asset trackers and fleet management devices that require a compact, low-power MCU with USB for charging and provisioning. The dual-partition Flash supports OTA firmware updates over cellular or LoRa backhaul, allowing firmware updates without device recall. The integrated LCD controller can drive a small status display showing tracking ID or signal strength. The XLP low-power modes extend battery life on solar or primary-cell powered trackers, and the industrial -40C to +125C temperature range handles outdoor deployment in vehicles, containers, and pallets.
推荐
推荐产品汇总
工程参考数据： PIC24FJ256GU405-E/M4 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC24FJ128GU405-I/M4 | PIC24FJ256GL405-E/M4 | PIC24FJ128GL405-I/M4 | PIC24FJ256GA705-I/M4 |
|---|---|---|---|---|---|
| Package | 48-pin UQFN (6x6 mm) | 48-pin UQFN (6x6 mm) - same | 48-pin UQFN (6x6 mm) - same | 48-pin UQFN (6x6 mm) - same | 48-pin UQFN (6x6 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 256 KB dual-partition | 128 KB dual-partition (-50%) | 256 KB single-partition (no OTA) | 128 KB single-partition (-50%) | 256 KB single-partition (no OTA) |
| CPU Speed | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS |
| USB | USB 2.0 Full-Speed with PHY | USB 2.0 Full-Speed with PHY | USB 2.0 Full-Speed with PHY | USB 2.0 Full-Speed with PHY | No USB (GA family) |
| OTA / Dual-Partition Flash | Yes (GU family) | Yes (GU family) | No (GL family) | No (GL family) | No (GA family) |
| LCD Controller | Integrated | Integrated | Integrated | Integrated | Integrated |
| Operating Temperature | -40C to +125C (E = Enhanced) | -40C to +85C (I = Industrial) | -40C to +125C (E = Enhanced) | -40C to +85C (I = Industrial) | -40C to +85C (I = Industrial) |
关键差异点
- Dual-partition Flash with real-time OTA updates （对比 PIC24FJ256GB410-I/PT)
- eXtreme Low Power (XLP) nanoWatt sleep currents （对比 PIC24FJ256GA705-I/M4)
- Integrated USB 2.0 Full-Speed with on-chip PHY （对比 PIC24FJ256GA705-I/M4)
设计说明
The PIC24FJ256GU405-E/M4 Vcap pin (pin 45) requires a low-ESR ceramic decoupling capacitor (typically 1uF to 4.7uF) placed within 2mm of the pin. The internal core voltage regulator feeds the digital logic from this capacitor; excessive trace inductance causes core voltage droop during sleep-to-active transitions, which can manifest as intermittent wake-up failures. Place Vcap on the same PCB layer as the IC, never under the package, and tie the ground side to the same ground plane as VSS pins 6, 24.
The 48-pin UQFN (6x6 mm) package exposes a thermal pad on its underside that MUST be soldered to a ground copper pour for thermal dissipation and electrical performance. Per JEDEC JESD51-3, an un-soldered thermal pad increases theta_JA by 50-100% and can cause thermal shutdown at lower ambient temperatures. Stitch the thermal pad to the ground plane with at least 8 thermal vias (0.3mm drill, 0.6mm pitch) for optimal heat conduction.
USB D+ and D- traces (pins 33-34) must be routed as a 90-ohm differential pair with matched lengths (within 150 mil). Place the VUSB decoupling capacitor (typically 0.1uF) within 3mm of pin 36, and keep USB traces away from switching power converter inductors. Per USB 2.0 Full-Speed specification, total D+/D- trace length should not exceed 50mm to maintain signal integrity at 12 Mbps.
When using dual-partition Flash for OTA updates, the bootloader image occupies one partition (typically 50% of total Flash) leaving ~128KB for the application. Developers must configure the linker script (e.g., MPLAB XC32 pPIC24Fxxx.ld) to map code sections to the active partition only. Forgetting this step causes linker errors or, worse, runtime faults when the bootloader overwrites itself. If OTA is not required, configure the device in single-partition mode for the full 256KB contiguous Flash.
The LCD segment pins (RB, RC, RD ports) are multiplexed with general-purpose I/O. When driving large LCD panels (>144 segments), the LCD charge pump switching can inject noise into nearby analog signals. Per the Microchip PIC24FJ GU4/GL4 family datasheet, add a 100nF bypass capacitor near each LCD bias voltage pin and route LCD segment traces on a different layer from sensitive analog inputs. Disabling unused LCD segments via the LCDCON register reduces switching noise by up to 70%.
合规信息
RoHS and REACH compliant per Microchip product page. Lead-free / halogen-free per Microchip material declaration. AEC-Q100 not applicable — MCU is not qualified for automotive use; choose PIC24FJxxx-Q1 variants for automotive applications.
