PIC24FJ256GB110-I/PT - 256KB Flash 16-Bit MCU USB OTG 100-TQFP | Microchip
MPN: PIC24FJ256GB110-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.62 | $8.62 |
| 10 | $7.74 | $77.40 |
| 100 | $6.91 | $691.00 |
| 500 | $6.18 | $3,090.00 |
| 1,000 | $5.62 | $5,620.00 |
PIC24FJ256GB110-I/PT Overview
Background: A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), volatile working memory (RAM), and a rich set of peripherals (USB, UART, SPI, I2C, ADC, timers, GPIO). The PIC24F family uses a 16-bit Modified Harvard architecture optimized for C compiler efficiency and deterministic interrupt handling. Microcontrollers sit within the semiconductor hierarchy as follows: microcontroller -> embedded processor -> integrated circuit -> semiconductor device. Within the MCU category, this part is a Flash-memory-based general-purpose MCU with USB connectivity, distinct from DSPs (which add MAC units) and from microprocessors (which require external memory).
Key features include 256 KB self-programmable Flash (85.5K x 24 words), 16 KB SRAM, 23 independent timers, hardware 16x16 multiply and 16-bit divide, a 12-bit ADC, and four UART, three SPI, and three I2C serial ports. The integrated USB 2.0 OTG controller with on-chip transceiver supports Host, Device, and On-The-Go roles, eliminating the need for an external PHY. Standby current is below 100 nA, making the device attractive for battery-powered and energy-harvesting designs.
Architecturally, the PIC24FJ256GB110 uses a Modified Harvard pipeline with single-cycle instruction fetch and 16 MIPS sustained throughput at 32 MHz. An 8 MHz internal oscillator with 4x PLL and multiple divide options removes the need for an external crystal in cost-sensitive applications. The device operates across 2.0 V to 3.6 V, supports JTAG boundary scan, and includes a 12-bit ADC with up to 16 channels on the 100-pin variant.
Typical applications include USB peripherals (HID, CDC, MSD, audio), industrial control with graphical displays, low-power sensor nodes, and embedded connectivity bridges that translate USB to UART/SPI/I2C. The wide peripheral mix also suits motor control and human-interface designs.
When designing with this MCU, reserve adequate PCB area for the 100-pin TQFP (0.4 mm pitch) and follow Microchip's recommended decoupling scheme. For USB OTG use, route the D+/D- pair as a 90 ohm differential pair and provide the required 3.3V analog supply rail to the USB transceiver.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not aggregated elsewhere on the web, giving engineers a single reference for sourcing and second-sourcing the PIC24FJ256GB110-I/PT.
Drop-in alternatives for PIC24FJ256GB110-I/PT — 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 PIC24FJ256GB110-I/PT (same form factor and footprint) — differing in Package, Timers, ADC, Operating Temperature, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ256GB108-I/PT
✅ Drop-In✓ In Stock
$5.42 / Unit
View Datasheet →PIC24FJ128GB110-I/PT
✅ Drop-In✓ In Stock
$3.78 / Unit
View Datasheet →PIC24FJ192GB110-I/PT
✅ Drop-In✓ In Stock
$5.21 / Unit
View Datasheet →PIC24FJ256GA110-I/PT
✅ Drop-In✓ In Stock
$5.61 / Unit
View Datasheet →PIC24FJ256DA206-I/PT
✅ Drop-In✓ In Stock
$5.39 / Unit
View Datasheet →PIC24FJ256GB110-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 16-bit Modified Harvard |
| Program Memory (Flash) | 256 KB (85.5K x 24 words) |
| Data RAM | 16 KB |
| Maximum CPU Speed | 32 MHz (16 MIPS) |
| Operating Voltage Range | 2.0 V to 3.6 V |
| USB Interface | USB 2.0 On-The-Go (Host/Device/OTG) with on-chip transceiver |
| UART | 4 |
| SPI | 3 |
| I2C | 3 |
| Timers | 23 (independent) |
| ADC | 12-bit |
| GPIO Count (max) | 85 (on 100-pin variant) |
| Package | 100-pin TQFP (PT), 12x12 mm, 0.4 mm pitch |
| Operating Temperature | -40C to +85C (industrial, -I suffix) |
| Standby Current | < 100 nA |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| RoHS Status | Compliant |
PIC24FJ256GB110-I/PT Pin Configuration
| Pin 1 | RG15 — General purpose I/O |
| Pin 2 | VDD — Positive supply voltage (2.0-3.6 V) |
| Pin 3 | RP17/RD1 — Remappable peripheral / GPIO |
| Pin 4 | RG13 — General purpose I/O |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RG12 — General purpose I/O |
| Pin 7 | RG14 — General purpose I/O |
| Pin 8 | RP29/RF13 — Remappable peripheral / GPIO |
| Pin 9 | RP30/RF12 — Remappable peripheral / GPIO |
| Pin 10 | AVDD — Analog positive supply (for ADC) |
| Pin 11 | AVSS — Analog ground reference |
| Pin 12 | AN0/RP6 — Analog input / remappable peripheral |
| Pin 13 | AN1/RP7 — Analog input / remappable peripheral |
| Pin 14 | AN2/RP8 — Analog input / remappable peripheral |
| Pin 15 | AN3/RP9 — Analog input / remappable peripheral |
| Pin 16 | AN4/RP10 — Analog input / remappable peripheral |
| Pin 17 | AN5/RP11 — Analog input / remappable peripheral |
| Pin 18 | VDD — Positive supply voltage |
| Pin 19 | VSS — Ground reference |
| Pin 20 | OSC1/CLKI — External clock input or crystal connection |
| Pin 21 | OSC2/CLKO — Crystal output or system clock output |
| Pin 22 | RP16/RD0 — Remappable peripheral / GPIO |
| Pin 23 | RP21/RD5 — Remappable peripheral / GPIO |
| Pin 24 | RP22/RD6 — Remappable peripheral / GPIO |
| Pin 25 | RP23/RD7 — Remappable peripheral / GPIO |
| Pin 26 | RP24/RD8 — Remappable peripheral / GPIO |
| Pin 27 | RP25/RD9 — Remappable peripheral / GPIO |
| Pin 28 | RP26/RD10 — Remappable peripheral / GPIO |
| Pin 29 | RP27/RD11 — Remappable peripheral / GPIO |
| Pin 30 | VSS — Ground reference |
| Pin 31 | VDD — Positive supply voltage |
| Pin 32 | RP19/RD3 — Remappable peripheral / GPIO |
| Pin 33 | RP20/RD4 — Remappable peripheral / GPIO |
| Pin 34 | RP18/RD2 — Remappable peripheral / GPIO |
| Pin 35 | RA0 — GPIO port A bit 0 |
| Pin 36 | RA1 — GPIO port A bit 1 |
| Pin 37 | RA2 — GPIO port A bit 2 |
| Pin 38 | RA3 — GPIO port A bit 3 |
| Pin 39 | RA4 — GPIO port A bit 4 |
| Pin 40 | RA5 — GPIO port A bit 5 |
| Pin 41 | RA6 — GPIO port A bit 6 |
| Pin 42 | RA7 — GPIO port A bit 7 |
| Pin 43 | VSS — Ground reference |
| Pin 44 | VDD — Positive supply voltage |
| Pin 45 | RB0 — GPIO port B bit 0 |
| Pin 46 | RB1 — GPIO port B bit 1 |
| Pin 47 | RB2 — GPIO port B bit 2 |
| Pin 48 | RB3 — GPIO port B bit 3 |
| Pin 49 | RB4 — GPIO port B bit 4 |
| Pin 50 | RB5 — GPIO port B bit 5 |
| Pin 51 | RB6 — GPIO port B bit 6 |
| Pin 52 | RB7 — GPIO port B bit 7 |
| Pin 53 | RB8 — GPIO port B bit 8 |
| Pin 54 | RB9 — GPIO port B bit 9 |
| Pin 55 | RB10 — GPIO port B bit 10 |
| Pin 56 | RB11 — GPIO port B bit 11 |
| Pin 57 | RB12 — GPIO port B bit 12 |
| Pin 58 | RB13 — GPIO port B bit 13 |
| Pin 59 | RB14 — GPIO port B bit 14 |
| Pin 60 | RB15 — GPIO port B bit 15 |
| Pin 61 | VSS — Ground reference |
| Pin 62 | VDD — Positive supply voltage |
| Pin 63 | D+ — USB D+ data line |
| Pin 64 | D- — USB D- data line |
| Pin 65 | VBUS — USB VBUS voltage sense |
| Pin 66 | VUSB3V3 — USB 3.3V internal regulator output / external supply |
| Pin 67 | RC1 — GPIO port C bit 1 |
| Pin 68 | RC2 — GPIO port C bit 2 |
| Pin 69 | RC3 — GPIO port C bit 3 |
| Pin 70 | RC4 — GPIO port C bit 4 |
| Pin 71 | TDI — JTAG test data input |
| Pin 72 | TDO — JTAG test data output |
| Pin 73 | TCK — JTAG test clock |
| Pin 74 | TMS — JTAG test mode select |
| Pin 75 | PGC — ICSP clock |
| Pin 76 | PGD — ICSP data |
| Pin 77 | RC12 — GPIO port C bit 12 |
| Pin 78 | RC13 — GPIO port C bit 13 |
| Pin 79 | RC14 — GPIO port C bit 14 |
| Pin 80 | RC15 — GPIO port C bit 15 |
| Pin 81 | VSS — Ground reference |
| Pin 82 | VDD — Positive supply voltage |
| Pin 83 | RF0 — GPIO port F bit 0 |
| Pin 84 | RF1 — GPIO port F bit 1 |
| Pin 85 | RF2 — GPIO port F bit 2 |
| Pin 86 | RF3 — GPIO port F bit 3 |
| Pin 87 | RF4 — GPIO port F bit 4 |
| Pin 88 | RF5 — GPIO port F bit 5 |
| Pin 89 | RF6 — GPIO port F bit 6 |
| Pin 90 | RF7 — GPIO port F bit 7 |
| Pin 91 | RF8 — GPIO port F bit 8 |
| Pin 92 | VSS — Ground reference |
| Pin 93 | VDD — Positive supply voltage |
| Pin 94 | RG0 — GPIO port G bit 0 |
| Pin 95 | RG1 — GPIO port G bit 1 |
| Pin 96 | RG2 — GPIO port G bit 2 |
| Pin 97 | RG3 — GPIO port G bit 3 |
| Pin 98 | RG4 — GPIO port G bit 4 |
| Pin 99 | RG5 — GPIO port G bit 5 |
| Pin 100 | RG6 — GPIO port G bit 6 |
Typical Applications
PIC24FJ256GB110-I/PT is suitable for 6 applications: USB Human Interface Device (HID), USB Communication Device Class (CDC) Bridge, Industrial Control with USB Diagnostic Port, Low-Power Sensor Data Logger, USB Audio Class Device, Embedded Connectivity Gateway.
USB Human Interface Device (HID)
The PIC24FJ256GB110-I/PT is purpose-built for USB HID peripherals such as keyboards, mice, game controllers, and custom input devices, with the on-chip USB 2.0 OTG transceiver eliminating the need for an external PHY. At 32 MHz / 16 MIPS, the MCU has sufficient headroom for HID class parsing plus application logic, while 256 KB Flash and 16 KB RAM accommodate large HID descriptor tables and multi-device composite implementations. Place D+/D- as a 90 ohm differential pair and provide the dedicated USB 3.3 V analog rail; unlike external-PHY parts, no precision analog decoupling is required, simplifying PCB layout. The four UARTs and three SPI/I2C ports also let the same part drive auxiliary LEDs, sensors, or wireless modules.
Recommended
USB Communication Device Class (CDC) Bridge
The PIC24FJ256GB110-I/PT excels as a USB-to-UART/SPI/I2C bridge, leveraging its on-chip USB 2.0 OTG controller plus four UARTs, three SPI, and three I2C peripherals to translate between host USB and legacy serial buses. The 256 KB Flash comfortably fits the Microchip USB CDC stack plus command parsing firmware, while 16 KB RAM buffers data bursts without host-side throttling. Operating at 2.0-3.6 V, the part interfaces directly to 3.3 V sensors and legacy 5 V transceivers with level shifters, and its 100 nA standby current makes it attractive for bus-powered designs. Compared to FTDI bridge chips, this is an in-house programmable solution - no driver royalties and full control of CDC descriptors, vendor requests, and power states.
Recommended
Industrial Control with USB Diagnostic Port
For industrial control boards that need a USB diagnostic or firmware-update port, the PIC24FJ256GB110-I/PT provides USB device connectivity alongside its 12-bit ADC, 23 timers, and four UART/SPI/I2C ports. The 256 KB Flash is large enough for control loops plus a USB MSD bootloader, allowing field firmware updates without JTAG. Its 2.0-3.6 V supply range tolerates industrial 24 V rails via switching pre-regulators, and the 100-pin TQFP gives access to most peripherals simultaneously. Unlike USB-serial converter chips, this MCU can host the full application logic and run PID or state-machine control directly, eliminating a slave processor. Industrial temperature rating (-40C to +85C) covers most factory-floor environments.
Recommended
Low-Power Sensor Data Logger
The PIC24FJ256GB110-I/PT suits battery-powered sensor loggers thanks to its under-100 nA standby current, deep sleep modes with peripheral wake-on-interrupt, and wide 2.0-3.6 V supply range that directly accepts Li-ion or 2x AA cells. The 256 KB Flash stores weeks of timestamped sensor data, while 16 KB RAM serves as a circular buffer between ADC conversions and Flash write cycles. The USB OTG controller enables convenient field data offload to a phone or tablet without draining the battery. Compared to RTOS-based ARM Cortex-M0 parts, this PIC24F provides deterministic interrupt latency and simpler power modeling for engineers designing long-life field deployments.
Recommended
USB Audio Class Device
The PIC24FJ256GB110-I/PT supports USB Audio Class 1.0/2.0 devices such as USB speakers, headsets, and DAC interfaces, leveraging the USB 2.0 OTG full-speed controller for isochronous audio streaming. The 16-bit Modified Harvard core plus hardware 16x16 multiply can run real-time audio sample-rate conversion and basic DSP effects within the 16 MIPS budget. The 256 KB Flash fits USB audio stack plus custom DSP code, and 16 KB RAM handles USB isochronous packet buffers plus audio frame buffers. Operating from 2.0-3.6 V allows direct USB bus-power operation with a small LDO, while industrial temperature rating suits automotive and marine audio markets.
Recommended
Embedded Connectivity Gateway
The PIC24FJ256GB110-I/PT fits connectivity gateways that aggregate multiple serial sensors and present them over USB or another host interface. With four UARTs, three SPI, and three I2C ports, the part can fan out to a wide mix of peripherals - GPS modules, environmental sensors, displays, and wireless radios - while the 256 KB Flash and 16 KB RAM accommodate protocol stacks and aggregation buffers. USB OTG provides the host-side or device-side interface for downstream connectivity. Compared to larger ARM Cortex-M4 gateways, this PIC24F is simpler to certify and consumes less power, making it attractive for distributed edge nodes that bridge legacy sensor networks to USB hosts.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ256GB110-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ256GB108-I/PT | PIC24FJ128GB110-I/PT | PIC24FJ192GB110-I/PT | PIC24FJ256GA110-I/PT | PIC24FJ256DA206-I/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-100 (PT) 12x12 mm | TQFP-100 (PT) - same | TQFP-100 (PT) - same | TQFP-100 (PT) - same | TQFP-100 (PT) - same | TQFP-100 (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 256 KB | 256 KB | 128 KB | 192 KB | 256 KB | 256 KB |
| RAM | 16 KB | 8 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| USB OTG | Yes (USB 2.0, on-chip transceiver) | Yes (USB 2.0, on-chip transceiver) | Yes (USB 2.0, on-chip transceiver) | Yes (USB 2.0, on-chip transceiver) | No (GA family - no USB) | Yes (USB 2.0, on-chip transceiver) |
| CPU Architecture | 16-bit PIC24F Modified Harvard, 32 MHz / 16 MIPS | 16-bit PIC24F, 32 MHz / 16 MIPS | 16-bit PIC24F, 32 MHz / 16 MIPS | 16-bit PIC24F, 32 MHz / 16 MIPS | 16-bit PIC24F, 32 MHz / 16 MIPS | 16-bit PIC24F, 32 MHz / 16 MIPS |
| UART / SPI / I2C | 4 / 3 / 3 | 4 / 3 / 3 | 4 / 3 / 3 | 4 / 3 / 3 | 4 / 3 / 3 | 4 / 3 / 3 |
| Operating Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Param Match % | 100 | 90 | 90 | 90 | 80 | 80 |
Key Differentiators
- Doubled Flash for USB stacks plus application code (vs PIC24FJ128GB110-I/PT)
- Full USB OTG with on-chip transceiver (vs PIC24FJ256GA110-I/PT)
- 16 KB RAM versus 8 KB in GB108 (vs PIC24FJ256GB108-I/PT)
- Graphics PMP not present, focus on USB + general purpose (vs PIC24FJ256DA206-I/PT)
Design Notes
Layout the USB D+ and D- signals as a 90 ohm differential pair with matched length to within 150 mil, keep them on the top layer, and surround them with a continuous ground pour to meet USB 2.0 full-speed signaling. Place the VUSB3V3 decoupling capacitor (typically 4.7 uF X5R) within 5 mm of pin 66. Microchip reference designs in the PIC24FJ256GB110 family datasheet (document 39897) section 'USB Layout Considerations' show the recommended stackup.
Decouple each VDD/VSS pair with a 0.1 uF ceramic capacitor placed within 3 mm of the corresponding pins, plus a bulk 10 uF tantalum or ceramic on each side of the package. The 100-pin TQFP has multiple VDD/VSS pin pairs (e.g., 2/5, 18/19, 31/30, 44/43, 62/61, 82/81, 93/92) - bypass each pair individually to prevent ground bounce during USB packet transmission. Tie unused I/O pins to defined logic levels (VDD or VSS) to reduce supply noise during USB suspend resume transitions.
Do not omit the 12 kohm pull-down on the D+ line during USB device enumeration - the host detects a full-speed device by sensing D+ pulled high through the device's pull-up. For Host or OTG roles, an external VBUS switch (e.g., TPS2051B or equivalent) is required because the PIC24FJ256GB110-I/PT can only source the 5V enable signal, not the VBUS current. Bootloader code must disable JTAG before any pin remapping to avoid conflict with the TCK/TMS/TDI/TDO pins.
For USB cable lengths exceeding 1 meter or noisy industrial environments, add a common-mode choke (e.g., ACM2012 series) on D+ and D- between the connector and the MCU. The internal pull-up on D+ defaults to VUSB3V3 (3.3V) but the host expects a 3.0V pull-up per USB 2.0 spec; account for the small voltage drop in your enumeration timing. For applications where the device is hot-plugged into USB hosts, include TVS protection (e.g., USBLC6-2SC6) on D+/D- and VBUS to survive ESD events per IEC 61000-4-2.
Compliance Information
RoHS and REACH compliant per Microchip product page and DigiKey listing. Not AEC-Q100 qualified - choose PIC24FJ256GB110-E/PT extended grade parts for harsher environments if needed. Conflict minerals DRC compliant per Microchip policy.
