MC68HC908JB8JPE - 8-bit HC08 USB MCU, 8KB Flash | NXP
N.º de pieza: MC68HC908JB8JPE ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.15 | $315,00 |
| 500 | $2.65 | $1.325,00 |
| 1.000 | $2.2 | $2.200,00 |
MC68HC908JB8JPE Descripción general
Background: an 8-bit microcontroller is a single-chip computer built around an 8-bit data path that integrates a CPU core, program memory, RAM, and peripheral modules (timers, I/O, communications). Within the broader semiconductor taxonomy, the HC08 sits below 16-bit (HC12/HCS12) and 32-bit (ColdFire/ARM Cortex-M) NXP architectures and above simple 4-bit controllers; HC08 parts use a CISC instruction set, are programmed in C or assembly, and target cost-sensitive embedded applications. The 'JB' family specifically integrates a USB device controller, eliminating the need for an external USB transceiver IC and reducing BOM cost in legacy USB 1.1 designs.
Key features include 8KB (8K x 8) of in-application-programmable Flash memory, 256 bytes of RAM, an integrated USB 1.1 full-speed device transceiver (12 Mbps), 13 bidirectional I/O pins, two timer/PWM channels, LVD and POR supervision, and a CISC HC08 CPU core running at 3 MHz internal bus speed. The 20-pin PDIP package (JPE suffix) is the through-hole variant of the family, and parts are supplied in tube packaging (RoHS-compliant per current distributor listings). The part is marked obsolete by current NXP lifecycle data, but it remains widely available from authorized distributors and the open market for legacy maintenance.
Typical applications include legacy USB HID peripherals (mice, keyboards, game pads), USB-to-UART bridges, low-cost USB dongles for authentication and software protection dongles, industrial USB I/O expanders, and educational/development platforms where the on-chip USB simplifies hardware. The integrated USB transceiver eliminates external PHY circuitry, reducing PCB area and BOM cost compared to MCU-plus-external-PHY designs.
When designing with this MCU, note that it is commercial temperature grade (0C to +70C) and is not AEC-Q100 qualified - for automotive or industrial extended-temperature applications, choose an industrial-grade variant or a modern Kinetis/LPC equivalent. Because the part is now obsolete, plan for lifecycle risk: source sufficient inventory for the product's expected lifetime, or migrate to a pin-compatible modern alternative. The USB module pins (PTE3/PTE4) double as 10 mA open-drain GPIO when USB is disabled.
Alternativas directas para MC68HC908JB8JPE — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MC68HC908JB8JPE (mismo factor de forma y huella) — difiere en Core Architecture, Core Processor, Program Memory Size, RAM Size, RoHS Status.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MC68HC908JB8JPE
✅ Sustitución directa✓ En stock
$2.2 / unidad
Ver hoja de datos →MC68HC908JB8CPE
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MC68HC908JB8CFA
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MC68HC908JL8CPE
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MCHC908JK8CPE
✅ Sustitución directa✓ En stock
$0.62 / unidad
Ver hoja de datos →MC68HC908JB16JPE
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MC68HC908JB8JPE Valores máximos y características eléctricas
| Core Processor | HC08 |
| Core Size | 8-Bit |
| Core Architecture | CISC |
| Speed (Internal Bus) | 3 MHz |
| Program Memory Size | 8 KB (8K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 256 x 8 (256 Bytes) |
| EEPROM Size | Not specified in datasheet excerpt |
| Number of I/O | 13 |
| Connectivity | USB (USB 1.1 full-speed device, 12 Mbps) |
| Peripherals | LVD, POR, PWM |
| Supply Voltage (Vcc) | 4.0 V to 5.5 V (typical 5 V) |
| Temperatura de funcionamiento | 0 C to +70 C (Commercial) |
| Encapsulado / Carcasa | 20-DIP (0.300", 7.62 mm) |
| Tipo de montaje | Through-Hole |
| Supplier Device Package | 20-PDIP |
| Temperature Grade | Commercial |
| Packaging | Tube |
| Estado RoHS | RoHS compliant (per current distributor listings) |
| USB Transceiver | Integrated (on-chip) |
Configuración de pines de MC68HC908JB8JPE
| Pin 1 | IRQ — External interrupt request input |
| Pin 2 | PTA0 — Port A bit 0 / general-purpose I/O |
| Pin 3 | PTA1 — Port A bit 1 / general-purpose I/O |
| Pin 4 | PTA2 — Port A bit 2 / general-purpose I/O |
| Pin 5 | PTA3 — Port A bit 3 / general-purpose I/O |
| Pin 6 | PTA4 — Port A bit 4 / general-purpose I/O |
| Pin 7 | PTA5 — Port A bit 5 / general-purpose I/O |
| Pin 8 | PTA6 — Port A bit 6 / general-purpose I/O |
| Pin 9 | PTA7 — Port A bit 7 / general-purpose I/O |
| Pin 10 | VSS — Ground |
| Pin 11 | PTB0 — Port B bit 0 / general-purpose I/O |
| Pin 12 | PTB1 — Port B bit 1 / general-purpose I/O |
| Pin 13 | PTB2 — Port B bit 2 / general-purpose I/O |
| Pin 14 | PTB3 — Port B bit 3 / general-purpose I/O |
| Pin 15 | PTB4 — Port B bit 4 / general-purpose I/O |
| Pin 16 | PTB5 — Port B bit 5 / general-purpose I/O |
| Pin 17 | PTE3/D- — USB D- data line / Port E bit 3 (10 mA open-drain GPIO when USB disabled) |
| Pin 18 | PTE4/D+ — USB D+ data line / Port E bit 4 (10 mA open-drain GPIO when USB disabled) |
| Pin 19 | VDD — Positive supply voltage (4.0 V to 5.5 V) |
| Pin 20 | RST — Reset input (active low) |
Aplicaciones típicas
MC68HC908JB8JPE es adecuado para 6 aplicacións: USB HID Peripherals (Keyboard/Mouse/Gamepad), USB-to-Serial Bridge / Dongle, Software Protection / Authentication Dongle, Low-Cost USB I/O Expander, USB Educational / Development Platform, Custom USB Toy / Consumer Gadget.
USB HID Peripherals (Keyboard/Mouse/Gamepad)
The MC68HC908JB8JPE is purpose-built for legacy USB Human Interface Device (HID) class peripherals because its integrated USB 1.1 full-speed device transceiver delivers 12 Mbps signaling without requiring an external PHY, dramatically reducing BOM cost and PCB area for HID-class products. With 8KB of in-application programmable Flash it accommodates typical HID report descriptors, boot protocol stacks, and key-scanning firmware for keyboards or mice, while the 256 bytes of RAM cover HID input reports and small protocol buffers. The 13 GPIO pins with 10 mA sink capability on PTE3/PTE4 directly drive LED indicators and scan matrices without external buffering, and the on-chip LVD/POR supervision ensures clean USB enumeration across plug events. Placed between the USB connector and the key matrix, the part eliminates two ICs (external PHY and reset supervisor) versus a generic 8-bit MCU approach.
Recomendado
USB-to-Serial Bridge / Dongle
The MC68HC908JB8JPE functions as a USB-to-UART bridge by using its integrated USB device controller to enumerate as a CDC (Communications Device Class) virtual COM port and bit-banging UART on the GPIO pins. At 3 MHz internal bus speed with CISC HC08 instructions, it can sustain typical 115200 baud UART rates without CPU loading issues, and the 8KB Flash holds a full CDC ACM stack plus UART handler. The 256-byte RAM is sufficient for USB endpoint buffers (typically 8-16 bytes each) plus a small UART FIFO. Compared to dedicated bridge ICs like FT232R, the JB8 offers programmable firmware flexibility at the cost of needing custom USB driver development, making it ideal for proprietary bridge applications where driver signing and customization matter more than out-of-the-box OS support.
Recomendado
Software Protection / Authentication Dongle
The MC68HC908JB8JPE is a frequent choice for USB software-protection dongles because its on-chip Flash can hold proprietary authentication algorithms while its USB device controller handles the host-to-dongle challenge/response protocol. The 8KB Flash accommodates simple AES or custom cipher routines plus USB HID-based challenge handling, and the 256-byte RAM suffices for in-flight challenge buffers. The integrated USB transceiver eliminates the external PHY that a discrete MCU would otherwise need, keeping the dongle small enough to fit standard USB form factors. The commercial temperature grade (0 C to +70 C) matches indoor use, and the part's obsolete status as of 2026 actually makes cloning harder, an advantage in security-sensitive applications where parts no longer in production are difficult for attackers to source in volume.
Recomendado
Low-Cost USB I/O Expander
In industrial USB I/O expander applications, the MC68HC908JB8JPE uses its integrated USB interface to receive commands from a host PC and drive its 13 GPIO pins accordingly, acting as a low-cost digital I/O module. The PWM module (2 channels per datasheet) can drive LED dimmers, fan speed controllers, or simple motor speed commands while the 8KB Flash holds the USB command parser and PWM update logic. The 256-byte RAM is adequate for command buffers and PWM duty-cycle tracking. Because the part is commercial temperature grade (0 C to +70 C), it suits indoor industrial environments and lab instrumentation rather than factory-floor extended-temperature deployments.
Recomendado
USB Educational / Development Platform
The MC68HC908JB8JPE serves as an educational microcontroller platform where students learn 8-bit embedded C programming, USB protocol implementation, and HC08 assembly language simultaneously. The integrated USB transceiver means students can plug the chip directly into a USB port and have a working HID device without external circuitry, focusing the curriculum on firmware rather than analog design. The 8KB Flash holds example firmware for HID keyboards, mice, and CDC serial devices, while 256 bytes of RAM is sufficient for typical tutorial-scale programs. The 20-pin PDIP through-hole package is breadboard-friendly for hands-on lab work, and NXP/Freescale legacy application notes include ready-to-use USB HID firmware examples for instructors to adapt. The part's obsolete status means universities should plan a migration path to modern Kinetis or LPC-series ARM platforms within the next 2-3 academic cycles.
Recomendado
Custom USB Toy / Consumer Gadget
The MC68HC908JB8JPE is well-suited for cost-sensitive USB consumer gadgets such as custom game controllers, USB-connected novelties, and educational toys where the integrated USB device controller and modest 8KB Flash deliver the right feature set at low BOM cost. The on-chip PWM module drives vibration motors, LED brightness, or simple sound effects; 13 GPIO pins interface to buttons, switches, and sensor inputs; and 256 bytes of RAM supports typical gadget-class state machines. The commercial temperature grade (0 C to +70 C) covers all indoor consumer use cases. The through-hole PDIP-20 package simplifies hand-soldering for prototype runs and low-volume specialty products, though surface-mount designs should migrate to the SO-20 version of the same die for higher-volume production.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC68HC908JB8JPE — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC68HC908JB8CPE | MC68HC908JB8CFA | MC68HC908JL8CPE | MCHC908JK8CPE | MC68HC908JB16JPE |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 20-PDIP | 20-PDIP - same | 20-PDIP - same | 20-PDIP - same | 20-PDIP - same | 20-PDIP - same |
| Core / Architecture | HC08 / 8-bit CISC | HC08 / 8-bit CISC | HC08 / 8-bit CISC | HC08 / 8-bit CISC | HC08 / 8-bit CISC | HC08 / 8-bit CISC |
| Flash Memory | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 16 KB (+100%) |
| RAM Size | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| USB Module | USB 1.1 full-speed device (12 Mbps) | USB 1.1 full-speed device | USB 1.1 full-speed device | No USB | No USB | USB 1.1 full-speed device |
| Internal Bus Speed | 3 MHz | 3 MHz | 3 MHz | 3 MHz | 3 MHz | 3 MHz |
| GPIO Count | 13 | 13 | 13 | 13 (different peripheral mapping) | 13 (different peripheral mapping) | 13 |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Diferenciadores clave
- Integrated USB 1.1 full-speed transceiver (frente a MC68HC908JL8CPE)
- Larger Flash memory headroom for complex USB stacks (frente a MCHC908JK8CPE)
- Drop-in upgrade path to doubled Flash for firmware growth (frente a MC68HC908JB16JPE)
Notas de diseño
The MC68HC908JB8JPE operates from a single 4.0 V to 5.5 V supply at 3 MHz internal bus speed. For USB bus-powered designs, derive 5V from the USB VBUS rail through a low-dropout regulator (e.g., MAX15062 series). Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 19) and a bulk 10 uF tantalum or ceramic on the USB VBUS rail. The on-chip LVD resets the part when VDD falls below threshold, so design the LDO dropout budget to keep VDD above the LVD threshold during USB suspend current spikes.
The 20-pin PDIP through-hole package is breadboard-friendly but requires through-hole PCB pads. Keep USB D+ and D- traces (pins 17 and 18) as short as possible and impedance-matched (90 ohms differential per USB 1.1 spec) for reliable signal integrity. Place the optional ESD protection array (e.g., MAX3344EUA) within 5 mm of the USB connector and route the protected signals directly to the MCU USB pins. Decouple both VDD and VSS with 100 nF capacitors placed within 3 mm of the respective pins.
Estimated power consumption: at 3 MHz and 5V, the HC08 core draws approximately 6-10 mA active and 1-3 mA in wait/stop mode. Do not exceed 5.5V on VDD or the on-chip Flash programming voltage regulator may be damaged. The IRQ pin (pin 1) is sensitive to noise; route it away from USB switching signals and add a 100 nF bypass if used as a wake source. Remember that PTE3/D- and PTE4/D+ are 10 mA open-drain only - they cannot source current in input mode and require external pull-ups when used as GPIO outputs.
Because the part is obsolete (as of 2026), source sufficient inventory for the product's entire expected lifetime in a single buy, or design in a pin-compatible modern alternative such as the NXP Kinetis E series in a QFP package (requires PCB rework). For new designs, plan a 2-3 year migration window: start firmware on the HC08JB to prove the concept, then port to a Kinetis or LPC-series ARM Cortex-M0 part with native USB. Reference the NXP AN2318 application note and Freescale legacy USB HID stack for firmware starting points.
Información de cumplimiento
RoHS compliance confirmed per DigiKey and Mouser current distributor listings. The 'E' suffix in JPE specifically denotes lead-free (Pb-free) finish. REACH SVHC, halogen-free status, and conflict minerals declaration are not explicitly stated in the verified distributor data excerpt and would need to be confirmed via NXP's full material declaration or certificate of compliance for formal regulatory submissions. AEC-Q100 is NOT qualified - the part is commercial temperature grade only.
