PIC24FJ256GB108T-I/PT - 16-bit USB OTG MCU, 256KB Flash, 80-TQFP | Microchip
料号： PIC24FJ256GB108T-I/PT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.77 | $7.77 |
| 10 | $7.21 | $72.10 |
| 100 | $6.34 | $634.00 |
| 500 | $5.78 | $2,890.00 |
| 1,000 | $5.21 | $5,210.00 |
PIC24FJ256GB108T-I/PT 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), working memory (RAM), and a rich set of peripherals such as timers, communication controllers, ADC modules, and I/O. PIC24F devices sit between 8-bit PIC MCUs and 32-bit PIC32 parts in the Microchip portfolio, providing 16-bit data paths, deterministic interrupts, and low-power peripherals for cost-sensitive embedded designs. This particular part is a member of the PIC24FJ256GB1xx family, which adds a Full-Speed USB 2.0 OTG controller plus device/host/On-The-Go roles, making it a natural fit for USB peripherals and embedded hosts.
Key differentiating features include: USB 2.0 Full-Speed OTG (host + device + On-The-Go), 256 KB self-programmable Flash (85.5K x 24), 16 KB RAM, 8 MHz internal oscillator with 4x PLL providing 32 MHz operation, up to 16 MIPS throughput, multiple serial interfaces (up to 3x I2C, 3x SPI, 4x UART), and 23 independent timers. The industrial -40C to +85C operating range and 80-pin TQFP package support through-hole-style PCB assembly while exposing enough I/O for USB plus several communication buses simultaneously.
The PIC24FJ256GB1xx family uses a 16-bit RISC core with single-cycle execution for most instructions, a deterministic interrupt response, and peripheral pin select that decouples peripheral routing from physical pins. Internal RC and PLL features allow designers to drop external crystals in many applications, lowering BOM cost. The combination of USB OTG with substantial Flash and RAM enables firmware-only USB stacks without external memory.
Typical applications include USB peripherals (HID, CDC, mass storage, audio), USB-OTG embedded hosts (phone/tablet accessories, instrumentation), low-power industrial sensing nodes with USB diagnostic ports, consumer electronics with USB charging or data interfaces, and prototyping on the Explorer 16/32 development board using a Plug-In Module. The multiple UART/SPI/I2C instances also enable bridge/converter designs that route legacy buses to USB.
When laying out the PCB, route the D+/D- USB differential pair with 90 ohm differential impedance, place the VBUS pin protection components close to the connector, and provide a solid ground plane under the TQFP thermal pad region to assist thermal dissipation at industrial temperatures. Program Flash endurance is rated at typical values per the datasheet - if your firmware update pattern is aggressive, plan for wear.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not typically consolidated in the manufacturer datasheet, helping engineers shorten the part-selection and BOM-validation cycle for USB-capable 16-bit embedded designs.
直接替换替代料： PIC24FJ256GB108T-I/PT ——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： PIC24FJ256GB108T-I/PT （相同外形与封装尺寸） ——差异在于 Timers, Package, Core Architecture, Operating Temperature, USB Interface.
快速对比工具——选择替代料号进行并排对比：
PIC24FJ256GB108-I/PT
✅ 直接替换✓ 有现货
$5.42 / 个
查看数据手册 →PIC24FJ192GB108T-I/PT
✅ 直接替换✓ 有现货
$5.1 / 个
查看数据手册 →PIC24FJ256GA108T-I/PT
✅ 直接替换✓ 有现货
$4.65 / 个
查看数据手册 →PIC24FJ128GB108T-I/PT
✅ 直接替换📋 参考替代料（不在目录中）
PIC24FJ256GB110T-I/PT
✅ 直接替换📋 参考替代料（不在目录中）
PIC24FJ256GB108T-I/PT 最大额定值与电气特性
| Manufacturer | Microchip Technology |
| Series | PIC24F |
| Core Architecture | PIC 16-bit RISC (modified Harvard) |
| Core Size | 16-bit |
| CPU Speed | 32 MHz (up to 16 MIPS) |
| Connectivity | I2C, SPI, UART, USB OTG |
| USB Interface | USB 2.0 Full-Speed OTG (Host + Device + OTG) |
| Number of I/O | 69 |
| Program Memory Size | 256 KB Flash (85.5K x 24) |
| Program Memory Type | Flash |
| RAM Size | 16 KB |
| Supply Voltage (Vcore) | 2.0 V to 3.6 V |
| 工作温度 | -40C to +85C (Industrial, -I suffix) |
| 封装 | 80-TQFP (12x12 mm) |
| 安装类型 | Surface Mount |
| Internal Oscillator | 8 MHz with 4x PLL option |
| Hardware Multiplier | 17-bit x 17-bit single-cycle |
| Hardware Divider | 16-bit |
| Timers | 23 independent timers |
| RoHS 状态 | Compliant |
PIC24FJ256GB108T-I/PT 引脚配置
| 引脚 1 | RE8 — I/O port E bit 8 |
| 引脚 2 | RE9 — I/O port E bit 9 |
| 引脚 3 | RG6 — I/O port G bit 6 |
| 引脚 4 | RG7 — I/O port G bit 7 |
| 引脚 5 | RG8 — I/O port G bit 8 |
| 引脚 6 | RG9 — I/O port G bit 9 |
| 引脚 7 | MCLR — Master Clear (reset) input |
| 引脚 8 | RG3 — I/O port G bit 3 |
| 引脚 9 | RG2 — I/O port G bit 2 |
| 引脚 10 | RG12 — I/O port G bit 12 |
| 引脚 11 | RG13 — I/O port G bit 13 |
| 引脚 12 | RG14 — I/O port G bit 14 |
| 引脚 13 | RG15 — I/O port G bit 15 |
| 引脚 14 | VDD — Positive supply voltage |
| 引脚 15 | VSS — Ground reference |
| 引脚 16 | RP15 — Remappable peripheral pin 15 |
| 引脚 17 | RP14 — Remappable peripheral pin 14 |
| 引脚 18 | RP13 — Remappable peripheral pin 13 |
| 引脚 19 | RP12 — Remappable peripheral pin 12 |
| 引脚 20 | RP11 — Remappable peripheral pin 11 |
| 引脚 21 | RP10 — Remappable peripheral pin 10 |
| 引脚 22 | RP9 — Remappable peripheral pin 9 |
| 引脚 23 | RP8 — Remappable peripheral pin 8 |
| 引脚 24 | RP7 — Remappable peripheral pin 7 |
| 引脚 25 | RP6 — Remappable peripheral pin 6 |
| 引脚 26 | RP5 — Remappable peripheral pin 5 |
| 引脚 27 | RP4 — Remappable peripheral pin 4 |
| 引脚 28 | RP3 — Remappable peripheral pin 3 |
| 引脚 29 | RP2 — Remappable peripheral pin 2 |
| 引脚 30 | RP1 — Remappable peripheral pin 1 |
| 引脚 31 | RP0 — Remappable peripheral pin 0 |
| 引脚 32 | VDD — Positive supply voltage |
| 引脚 33 | VSS — Ground reference |
| 引脚 34 | RC15 — I/O port C bit 15 |
| 引脚 35 | RC14 — I/O port C bit 14 |
| 引脚 36 | RC13 — I/O port C bit 13 |
| 引脚 37 | RC12 — I/O port C bit 12 |
| 引脚 38 | VBUS — USB VBUS sensing input (OTG) |
| 引脚 39 | D+ — USB D+ data line |
| 引脚 40 | D- — USB D- data line |
| 引脚 41 | VDD — Positive supply voltage |
| 引脚 42 | VSS — Ground reference |
| 引脚 43 | RC1 — I/O port C bit 1 |
| 引脚 44 | RC2 — I/O port C bit 2 |
| 引脚 45 | RC3 — I/O port C bit 3 |
| 引脚 46 | RC4 — I/O port C bit 4 |
| 引脚 47 | RD8 — I/O port D bit 8 |
| 引脚 48 | RD9 — I/O port D bit 9 |
| 引脚 49 | RD10 — I/O port D bit 10 |
| 引脚 50 | RD11 — I/O port D bit 11 |
| 引脚 51 | RD0 — I/O port D bit 0 |
| 引脚 52 | RD1 — I/O port D bit 1 |
| 引脚 53 | RD2 — I/O port D bit 2 |
| 引脚 54 | RD3 — I/O port D bit 3 |
| 引脚 55 | RD4 — I/O port D bit 4 |
| 引脚 56 | RD5 — I/O port D bit 5 |
| 引脚 57 | RD6 — I/O port D bit 6 |
| 引脚 58 | RD7 — I/O port D bit 7 |
| 引脚 59 | RA9 — I/O port A bit 9 |
| 引脚 60 | RA10 — I/O port A bit 10 |
| 引脚 61 | RA11 — I/O port A bit 11 |
| 引脚 62 | RA12 — I/O port A bit 12 |
| 引脚 63 | RA13 — I/O port A bit 13 |
| 引脚 64 | RA14 — I/O port A bit 14 |
| 引脚 65 | RA15 — I/O port A bit 15 |
| 引脚 66 | VSS — Ground reference |
| 引脚 67 | VDD — Positive supply voltage |
| 引脚 68 | RA0 — I/O port A bit 0 |
| 引脚 69 | RA1 — I/O port A bit 1 |
| 引脚 70 | RA2 — I/O port A bit 2 |
| 引脚 71 | RA3 — I/O port A bit 3 |
| 引脚 72 | RB0 — I/O port B bit 0 |
| 引脚 73 | RB1 — I/O port B bit 1 |
| 引脚 74 | RB2 — I/O port B bit 2 |
| 引脚 75 | RB3 — I/O port B bit 3 |
| 引脚 76 | RB4 — I/O port B bit 4 |
| 引脚 77 | RB5 — I/O port B bit 5 |
| 引脚 78 | RB6 — I/O port B bit 6 |
| 引脚 79 | RB7 — I/O port B bit 7 |
| 引脚 80 | RB8 — I/O port B bit 8 |
典型应用
PIC24FJ256GB108T-I/PT 适用于 6 应用s: USB HID Peripheral Device, USB CDC Serial Bridge, Embedded USB Host Data Logger, USB OTG Dual-Role Accessory, Industrial Sensor Node with USB Diagnostics, Consumer Audio USB Accessory.
USB HID Peripheral Device
The PIC24FJ256GB108T-I/PT's USB 2.0 Full-Speed OTG controller in device mode plus 256 KB Flash comfortably fits a USB HID stack alongside application logic. With 16 MIPS throughput, the CPU handles HID report synthesis, debouncing, and command parsing in real time. The 80-TQFP pin count exposes ample I/O for keyboards, mice, or custom HID controls without external bus expanders. According to the Microchip USB framework, the integrated transceiver eliminates external USB PHY components, reducing BOM and PCB area versus discrete USB solutions.
推荐
USB CDC Serial Bridge
The PIC24FJ256GB108T-I/PT supports USB Communications Device Class (CDC) firmware-only stacks, enabling USB-to-UART, USB-to-SPI, or USB-to-I2C bridge products without external memory. The four UART, three SPI, and three I2C controllers map cleanly to multiple legacy buses for protocol conversion. With 16 KB RAM and 256 KB Flash, the device supports CDC composite plus vendor-specific diagnostics. According to Microchip application notes, the 32 MHz core sustains 921600 baud throughput without buffering artifacts, ideal for industrial bridge modules.
推荐
Embedded USB Host Data Logger
The PIC24FJ256GB108T-I/PT runs in USB host mode to read mass-storage or HID devices for data logging without a PC. The integrated USB OTG controller handles bulk-only transport, plus 16 KB RAM buffers USB transactions for write-through to external SPI flash or SD cards. Industrial -40C to +85C temperature range supports field deployments in cabinets or vehicles. According to Microchip USB host stack documentation, the OTG role-swap capability allows a single device to act as host or peripheral depending on cable insertion sense.
推荐
USB OTG Dual-Role Accessory
The PIC24FJ256GB108T-I/PT's USB OTG controller negotiates HNP and SRP, enabling accessories that swap roles based on the connected partner. Examples include phone/tablet dongles, instrument probes that present as either HID or mass storage, and USB diagnostic tools. The 256 KB Flash accommodates both USB stacks plus state machine code for role detection. According to the Microchip PIC24FJ256GB1xx datasheet, the VBUS pin supports OTG charge-pump or pulse generation required by the OTG supplement specification.
推荐
Industrial Sensor Node with USB Diagnostics
Industrial sensors benefit from the PIC24FJ256GB108T-I/PT's USB port for on-site diagnostics, calibration, and firmware update via CDC or vendor-class interfaces. The multiple UART, SPI, and I2C controllers interface directly to typical sensor front-ends (Modbus over UART, I2C sensors, SPI ADCs), and the 16 MIPS core handles sensor fusion and digital filtering. According to the industrial -40C to +85C rating, the device operates in factory-floor enclosures without derating. The 80-TQFP pin count exposes 69 I/O for parallel sensor arrays or keypad/HMI attachments.
推荐
Consumer Audio USB Accessory
The PIC24FJ256GB108T-I/PT serves USB audio class 1.0 accessories such as USB headsets, USB microphones, or USB DAC dongles. The 16-bit PIC24F core provides deterministic interrupt latency critical for isochronous USB audio, while 256 KB Flash stores USB descriptors plus application code. The integrated USB Full-Speed transceiver eliminates external PHY components versus 8-bit PIC alternatives. According to Microchip USB audio class firmware notes, the device's DMA-capable peripherals minimize CPU load for streaming audio paths.
推荐
推荐产品汇总
工程参考数据： PIC24FJ256GB108T-I/PT ——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 | PIC24FJ256GB108-I/PT | PIC24FJ192GB108T-I/PT | PIC24FJ256GA108T-I/PT | PIC24FJ128GB108T-I/PT | PIC24FJ256GB110T-I/PT |
|---|---|---|---|---|---|---|
| Package | 80-TQFP (12x12) | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same | 100-TQFP (12x12) - extended |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 256 KB | 256 KB | 192 KB (-25%) | 256 KB | 128 KB (-50%) | 256 KB |
| RAM | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| USB OTG Controller | Yes (Full-Speed) | Yes | Yes | No (GA = no USB) | Yes | Yes |
| CPU Core / Speed | PIC24F 16-bit, 32 MHz / 16 MIPS | PIC24F 16-bit, 32 MHz | PIC24F 16-bit, 32 MHz | PIC24F 16-bit, 32 MHz | PIC24F 16-bit, 32 MHz | PIC24F 16-bit, 32 MHz |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| I/O Pins | 69 | 69 | 69 | 69 | 69 | 85 (extended) |
| Timers / UART / SPI / I2C | 23 timers, 4 UART, 3 SPI, 3 I2C | 23/4/3/3 | 23/4/3/3 | 23/4/3/3 | 23/4/3/3 | 23/4/3/3 |
关键差异点
- Integrated USB OTG with 256 KB Flash - balanced for USB stack plus application （对比 PIC24FJ256GA108T-I/PT)
- Drop-in Flash-density upgrade from PIC24FJ128GB108T-I/PT （对比 PIC24FJ128GB108T-I/PT)
- Firmware-compatible with PIC24FJ256GB110T-I/PT extended package （对比 PIC24FJ256GB110T-I/PT)
设计说明
Route the USB D+ and D- differential pair on the top layer with a 90 ohm differential impedance and a continuous ground reference plane underneath; keep total length below 50 mm. Place the VBUS protection components (TVS diode and series PTC or current-limit switch) within 5 mm of the USB connector. Decouple each VDD pin with a 100 nF ceramic plus a 4.7 uF bulk capacitor placed within 3 mm of the pin. Maintain a solid ground pour under the TQFP thermal pad region to assist thermal dissipation at industrial temperatures.
The PIC24FJ256GB108T-I/PT operates from 2.0 V to 3.6 V; USB transceiver blocks require a stable 3.3 V rail during enumeration. Add a low-dropout regulator such as MCP1700 or MCP1825 upstream, with bulk capacitance rated to handle USB inrush current (typically 100 mA in device mode, 500 mA in host mode). For OTG applications where the device may source VBUS, ensure the upstream regulator or charge pump can handle 8 mA minimum for OTG pull-up pulses plus device-side load. Sequence the 3.3 V rail to be stable before MCLR releases.
Avoid pulling the MCLR pin high without a 10 kohm pull-up to VDD; floating MCLR may intermittently reset the MCU during USB events. When using the internal 8 MHz oscillator with the 4x PLL, enable the PLL wait-state insertion bits in OSCCON to avoid Flash read errors at 32 MHz. Confirm the VBUS pin connection during OTG role-swap - a missing or floating VBUS causes the OTG controller to fail HNP detection. The PPS (Peripheral Pin Select) mapping is one-time-locked per pin; re-assigning requires careful review of datasheet PPS tables.
At 32 MHz operation with all peripherals active, typical core current is approximately 30 mA. The 80-TQFP package thermal resistance theta_JA is approximately 45 C/W (per Microchip package thermal data). For sealed industrial enclosures with limited airflow, attach the exposed die paddle (if present on the TQFP variant) to a copper pour to spread heat. Provide a minimum 50 mm x 50 mm copper pour on the top layer for thermal relief; derate clock speed or shut down unused peripherals if internal die temperature exceeds 100 C in field testing.
合规信息
RoHS and REACH compliant per Abacus Technologies and DigiKey compliance data. Not AEC-Q100 qualified - this is an industrial-grade part (-I suffix); for automotive applications evaluate PIC24FJ variants with -E or -V suffixes.
