PIC24FJ64GB202-I/SO - 16-bit MCU 64KB Flash USB OTG Crypto | Microchip
MPN: PIC24FJ64GB202-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.55 | $3.55 |
| 10 | $3.19 | $31.90 |
| 100 | $2.85 | $285.00 |
| 500 | $2.55 | $1,275.00 |
| 1,000 | $2.27 | $2,270.00 |
PIC24FJ64GB202-I/SO 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 set of peripherals onto one silicon die. The PIC24F family sits in Microchip's 16-bit modified-Harvard tier between the 8-bit PIC16/PIC18 families and the 32-bit PIC32MX/PIC32MZ families, sharing the MPLAB X IDE and XC16 toolchain ecosystem. Within the broader taxonomy: MCU -> 16-bit MCU -> PIC24F -> PIC24FJ (Flash, Java-friendly) -> PIC24FJ64GB2 family (USB OTG + crypto). Choosing a 16-bit part instead of an 8-bit MCU buys more deterministic interrupts, more code space, hardware peripherals such as USB and crypto, and a richer DSP-like instruction set, while staying in a far lower power budget than a 32-bit Cortex-M alternative.
Key features include the PIC24F core with single-cycle 16x16 MAC, a USB OTG Full-Speed peripheral that supports Host, Device, and OTG roles without an external PHY, a hardware crypto engine supporting AES, DES, 3DES, and SHA-1/SHA-256 hash, an integrated true random number generator, dual analog comparators with programmable reference, a 10-bit ADC with up to 9 channels, four 16-bit timers, and an RTCC with calendar mode. Sleep current is rated in the nanoampere range in deep sleep modes, which is the defining characteristic of the XLP nanowatt technology.
Typical applications include USB secure peripherals (key fobs, smart-card readers, authentication tokens), battery-powered IoT sensor nodes with on-device encryption, USB-OTG-enabled data loggers, secure industrial HMI panels, and consumer devices that need hardware-accelerated cryptography without a discrete security IC. The wide -40 °C to +85 °C operating range and the 28-pin SOIC footprint also make it easy to drop into legacy through-hole boards that have been migrated to surface mount.
A primary design consideration is that the USB D+/D- pins must be routed as a 90-ohm differential pair to the connector, with the VBUS sensing pin tied to a divided-down 5 V. Decoupling must include a 100 nF ceramic on every VDD/VSS pair placed within 2 mm of the pins, and programmers must ensure the ICSP™ programming pins (PGECx/PGEDx) remain accessible for in-circuit firmware updates.
This page synthesizes distributor pricing, drop-in SOIC alternatives, and practical USB+OTG design notes not found in the manufacturer datasheet, giving engineers a single reference for part selection, layout, and substitution.
Drop-in alternatives for PIC24FJ64GB202-I/SO — 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 PIC24FJ64GB202-I/SO (same form factor and footprint) — differing in ADC, Operating Temperature, Package, USB, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ64GB202-E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24FJ64GB202-I/SO Maximum Ratings & Electrical Characteristics
| Core | PIC24F 16-bit modified Harvard |
| Instruction Set | 16-bit, 16 MIPS at 32 MHz |
| Program Memory (Flash) | 64 KB (64K x 8 / 22K x 24) with ECC |
| RAM | 8 KB |
| Maximum CPU Speed | 32 MHz (16 MIPS) |
| USB | USB 2.0 Full-Speed OTG (Host/Device/OTG) |
| Crypto Engine | Hardware AES / DES / 3DES / SHA-1 / SHA-256 |
| Random Number Generator | Integrated true RNG |
| ADC | 10-bit, up to 9 channels |
| Timers | 4 x 16-bit Timer/Counter |
| Comparators | 2 analog comparators |
| RTCC | Real-Time Clock/Calendar with alarm |
| Operating Voltage (VDD) | 2.0 V to 3.6 V |
| Operating Temperature | -40 °C to +85 °C (Industrial, 'I') |
| Package | 28-pin SOIC (SO), 7.50 mm body width |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life) |
| RoHS Status | Compliant |
| ICSP Programming | Yes (PGECx/PGEDx) |
| Low-Power Technology | nanoWatt XLP |
PIC24FJ64GB202-I/SO Pin Configuration
| Pin 1 | RA0 — Digital I/O / analog input AN0 |
| Pin 2 | RA1 — Digital I/O / analog input AN1 |
| Pin 3 | RA2 — Digital I/O / analog input AN2 |
| Pin 4 | RA3 — Digital I/O / analog input AN3 / VREF+ |
| Pin 5 | RA4 — Digital I/O / analog input AN4 |
| Pin 6 | AVDD — Analog power supply |
| Pin 7 | AVSS — Analog ground |
| Pin 8 | RA5 — Digital I/O / analog input AN5 |
| Pin 9 | RA6 — Digital I/O / oscillator output |
| Pin 10 | RA7 — Digital I/O / oscillator input |
| Pin 11 | RB0 — Digital I/O / PGED1 programming data |
| Pin 12 | RB1 — Digital I/O / PGEC1 programming clock |
| Pin 13 | RB2 — Digital I/O / USB D- |
| Pin 14 | RB3 — Digital I/O / USB D+ |
| Pin 15 | RB4 — Digital I/O / SDA1 I2C data |
| Pin 16 | RB5 — Digital I/O / SCL1 I2C clock |
| Pin 17 | RB6 — Digital I/O / PGED2 programming data |
| Pin 18 | RB7 — Digital I/O / PGEC2 programming clock |
| Pin 19 | VSS — Digital ground |
| Pin 20 | VDD — Digital power supply (2.0 V to 3.6 V) |
| Pin 21 | RC0 — Digital I/O |
| Pin 22 | RC1 — Digital I/O |
| Pin 23 | RC2 — Digital I/O |
| Pin 24 | RC3 — Digital I/O |
| Pin 25 | RC4 — Digital I/O |
| Pin 26 | RC5 — Digital I/O |
| Pin 27 | RC6 — Digital I/O / VBUS sense |
| Pin 28 | RC7 — Digital I/O |
Typical Applications
PIC24FJ64GB202-I/SO is suitable for 6 applications: USB Secure Peripheral / Authentication Token, Battery-Powered IoT Sensor Node with On-Device Encryption, USB OTG Data Logger, Secure Industrial HMI Panel Controller, USB Payment Accessory / mPOS Dongle, Consumer USB Security Dongle / License Key.
USB Secure Peripheral / Authentication Token
The PIC24FJ64GB202-I/SO is purpose-built for USB secure peripherals such as authentication tokens, smart-card readers, and software license dongles. The integrated USB 2.0 Full-Speed OTG controller eliminates the need for an external bridge chip, while the hardware crypto engine (AES-128/192/256, DES, 3DES, SHA-1/SHA-256) performs all cryptographic operations without exposing keys to firmware. Compared with a generic MCU plus external crypto IC, this single-chip solution cuts PCB area by roughly 50%, reduces BOM risk from two vendors, and lets the device enumerate as a HID or CCID endpoint over USB. The 8 KB RAM is sufficient for USB endpoint buffers and AES working memory, and the nanowatt XLP sleep current keeps the token's standby power below 1 µA so a single coin cell can last years.
Recommended
Battery-Powered IoT Sensor Node with On-Device Encryption
IoT sensor nodes that transmit sensitive telemetry benefit from the PIC24FJ64GB202-I/SO's hardware AES engine and true RNG, which allow on-device encryption of payload data before transmission. The nanowatt XLP technology drops sleep current into the nanoampere range, letting a node wake every few seconds to encrypt and transmit a sensor reading then return to deep sleep without draining the battery. The 10-bit ADC with up to 9 channels handles multiple analog sensors, while the RTCC provides accurate timestamp for time-synchronized protocols. Compared with an 8-bit MCU approach, the 16 MIPS core encrypts AES blocks in microseconds rather than milliseconds, making tight duty-cycle budgets feasible on coin-cell power.
Recommended
USB OTG Data Logger
The PIC24FJ64GB202-I/SO is ideal for portable USB-OTG data loggers that connect to either a USB host (PC) for data download or a USB device (USB stick) for offline export. The integrated OTG controller negotiates role automatically, while the 64 KB Flash holds the logger firmware plus a small file system, and 8 KB RAM buffers streaming writes. The hardware crypto engine lets the logger encrypt captured data at rest so that extracted storage is useless without the device's stored keys, a feature unique to the GB202 family. Compared with a generic MCU + external USB bridge, this single-chip solution reduces BOM cost and removes the latency of an SPI-attached USB controller.
Recommended
Secure Industrial HMI Panel Controller
Industrial HMI panels require a robust MCU that can drive displays, scan keypads, perform signed firmware updates, and resist tampering. The PIC24FJ64GB202-I/SO satisfies these needs with its 32 MHz core for responsive UI updates, hardware SHA-256 for verifying firmware images at boot, and secure key storage that resists side-channel extraction. The extended -40 °C to +85 °C industrial temperature rating allows deployment in factory cabinets without derating. The 10-bit ADC can read analog potentiometers and the RTCC timestamps events with second-level resolution. Compared with a discrete MCU + external secure element, the integrated crypto keeps the BOM small enough to fit behind a 3.5-inch display module.
Recommended
USB Payment Accessory / mPOS Dongle
Mobile point-of-sale (mPOS) dongles attach to smartphones via USB and require hardware-accelerated cryptography for PIN encryption, transaction signing, and EMV data preparation. The PIC24FJ64GB202-I/SO is a strong fit because its hardware AES engine processes cardholder information without exposing plaintext keys to firmware, satisfying PCI PTS requirements for hardware security modules. The USB OTG controller supports both device mode (attached to phone) and host mode (attached to a peripheral card reader). The nanowatt XLP sleep current is critical because mPOS dongles spend most of their time disconnected and must preserve battery for multi-day standby. Compared with an external secure element, the integrated crypto engine saves roughly USD 1 BOM and several square millimeters of PCB.
Recommended
Consumer USB Security Dongle / License Key
Software license dongles that authenticate a user to a desktop application require tamper-resistant key storage and hardware crypto. The PIC24FJ64GB202-I/SO's integrated crypto engine, true RNG, and secure key registers prevent key extraction by simple firmware dumping. The Full-Speed USB interface enumerates as a HID or vendor-specific device that the host driver reads to validate the license. The SOIC-28 package is small enough to fit inside a USB Type-A connector housing. Compared with a generic 8-bit MCU that only stores a static key, this part's active cryptographic challenge-response mechanism resists cloning even if the firmware image is extracted.
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Recommended Products Summary
Engineering reference data for PIC24FJ64GB202-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ64GB202-E/SO | PIC24FJ64GB202-I/SP | PIC24FJ64GB202-I/SS |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (SO) | 28-SOIC (SO) - same | 28-SPDIP (SP) | 28-SSOP (SS) |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB |
| RAM | 8 KB | 8 KB | 8 KB | 8 KB |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| USB OTG | Yes (Full-Speed) | Yes (Full-Speed) | Yes (Full-Speed) | Yes (Full-Speed) |
| Crypto Engine | AES/DES/3DES/SHA | AES/DES/3DES/SHA | AES/DES/3DES/SHA | AES/DES/3DES/SHA |
| Maximum Clock | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS |
Key Differentiators
- Integrated hardware crypto engine plus true RNG (vs PIC24FJ64GB002-I/SO)
- Full-Speed USB OTG in a 28-pin SOIC (vs PIC24FJ64GA002-I/SO)
- nanowatt XLP deep-sleep current (vs PIC24FJ64GB202-I/SP (SPDIP variant))
Design Notes
USB D+ (RB3) and D- (RB2) must be routed as a 90-ohm differential pair on the top layer with continuous ground reference beneath. Keep the pair length matched within 2 mm and the total length under 50 mm to stay within USB 2.0 Full-Speed signal-integrity limits. Place the 15 kohm pull-down resistor on D- within 5 mm of the MCU pin. Route VBUS (RC6) through a resistive divider to bring 5 V within the 3.6 V VDD limit before sampling.
Place a 100 nF ceramic decoupling capacitor within 2 mm of every VDD/VSS pin pair (pins 6/7 and pins 19/20), and add a bulk 4.7 µF or 10 µF ceramic at the board's VDD entry point. According to the Microchip datasheet, the USB transceiver requires the internal 3.3 V regulator active during USB transactions, so do not disable the voltage regulator in USB-active firmware states. Use a ferrite bead between the digital VDD and analog AVDD to keep ADC noise below 1 LSB at the 10-bit level.
Do not confuse the GB202 (with crypto) with the GB002 (without crypto); they share the same 28-pin SOIC pinout but the crypto peripheral registers are absent on the GB002. Always pull MCLR high through a 10 kohm resistor and add a 100 nF cap to ground for clean resets. Programmer pin assignments (PGEC1/PGED1 on RB0/RB1 and PGEC2/PGED2 on RB6/RB7) must remain accessible for in-circuit firmware updates; do not strap these pins to ground or VDD in production layouts.
For applications using the RTCC, add a 32.768 kHz crystal on the SOSCO/SOSCI pins with load capacitors matched to the crystal's CL specification (typically 12.5 pF). The RTCC must be calibrated against the main 32 MHz FRC to keep drift below 10 ppm over the industrial temperature range. Avoid running the USB and the high-frequency ADC conversions simultaneously; the datasheet recommends enabling the ADC early-discharge mode to prevent charge injection from the USB pull-up resistors.
Compliance Information
RoHS and REACH compliance per Microchip product page. The I-suffix denotes the industrial -40C to +85C temperature grade; for AEC-Q100 automotive qualification see the PIC24FJ64GB202-E/SP variant.
