MC908JB16FAE - 8-Bit HC08 MCU, 16KB Flash, USB, 32-LQFP | NXP
料号： MC908JB16FAE ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.55 | $75.50 |
| 100 | $6.62 | $662.00 |
| 500 | $5.78 | $2,890.00 |
| 1,000 | $5.1 | $5,100.00 |
MC908JB16FAE 概述
A microcontroller (MCU) is a single-chip computer that combines a CPU core, program memory (Flash/ROM), working memory (RAM), and a set of peripheral interfaces (USB, timers, ADC, GPIO, SCI). The MC908JB16FAE belongs to the Freescale/NXP HC08 family of 8-bit CISC microcontrollers, the predecessor to the S08 and Kinetis families. By embedding a USB 1.1 (full-speed, 12 Mbps) device transceiver with on-chip 3.3 V regulator and 1.5 kΩ software-configurable pull-up on the D- line, this MCU eliminates the discrete PHY + serial-jtag converter required by earlier 8051-based USB designs, simplifying BOM and reducing board area.
Key features include 6 MHz internal bus clock, 21 general-purpose I/O pins (shared with USB, SCI, timer, and interrupt functions), built-in peripherals (LED driver, low-voltage detect, power-on reset, PWM, SCI), 16 KB Flash program memory with in-application programming support, 384 B RAM, and a 32-pin LQFP industrial-grade operating range of 0 C to +70 C (industrial variants available). The integrated USB module supports control, interrupt, bulk, and isochronous endpoints, sufficient for HID, CDC/ACM, and vendor-class device firmware.
The HC08 CPU core uses a Von Neumann memory architecture with a 16-bit stack pointer and a small unified instruction set optimized for code density (typical instructions are 1-3 bytes). The internal oscillator and phase-locked loop allow flexible system clock generation without an external crystal in some configurations, while the USB module requires a 48 MHz clock derived from the PLL for full-speed signaling. This architecture trades raw clock speed (6 MHz) for low power and deterministic interrupt latency, which suits HID polling loops and low-bandwidth USB CDC streams.
Typical applications include USB HID peripherals (mice, keyboards, custom input devices), USB-to-UART bridge dongles (replacing FTDI-style cables), embedded USB learning kits, industrial data-loggers with USB diagnostics, and point-of-sale peripherals. The integrated pull-up and embedded voltage regulator mean a USB device can be built with this MCU plus a few passives, no external USB PHY chip required.
When designing with this part, note that the HC08 instruction set, while capable, requires the legacy CodeWarrior HC08 toolchain (now superseded by S08/Kinetis tools); firmware migration to newer NXP families is recommended for new designs. USB firmware must implement the device-state machine per USB 1.1 specification to achieve enumeration. For new designs, consider the Freescale/NXP S08JM60 or Kinetis KE series as modern drop-in USB-enabled successors, though they require new toolchains and may differ in peripheral mapping.
This page synthesizes distributor pricing, pin-compatible alternatives, application references, and practical design notes that are not collated in the manufacturer datasheet alone.
直接替换替代料： MC908JB16FAE ——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： MC908JB16FAE （相同外形与封装尺寸） ——差异在于 Package, Core Architecture, Maximum Clock Frequency, Operating Supply Voltage, Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
MC908JB16FPE
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC908JB8FAE
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC908JL16CFJE
✅ 直接替换✓ 有现货
$5.62 / 个
查看数据手册 →MC908JB16FAE 最大额定值与电气特性
| Core Processor | HC08 |
| Core Size | 8-Bit |
| Core Architecture | CISC (Von Neumann) |
| 最大时钟频率 | 6 MHz (internal bus) |
| Program Memory Size | 16 KB (16K x 8) Flash |
| RAM Size | 384 B |
| Connectivity | SCI, USB |
| USB Interface | USB 1.1 full-speed (12 Mbps) device, integrated PHY + 3.3 V regulator + 1.5 kOhm pull-up |
| Number of I/O Pins | 21 |
| Peripherals | LED driver, LVD, POR, PWM, SCI |
| 封装 | 32-LQFP (7x7 mm) |
| 工作电源电压 | 4.0 V to 5.5 V (USB active) |
| 工作温度 | 0 C to +70 C |
| 安装类型 | Surface Mount |
| Part Status | Obsolete (per third-party distributor listings) |
MC908JB16FAE 引脚配置
| 引脚 1 | IRQ — External interrupt request input |
| 引脚 2 | PTA0 — Port A bit 0 (GPIO) |
| 引脚 3 | PTA1 — Port A bit 1 (GPIO) |
| 引脚 4 | PTA2 — Port A bit 2 (GPIO) |
| 引脚 5 | PTA3 — Port A bit 3 (GPIO) |
| 引脚 6 | PTA4 — Port A bit 4 (GPIO) |
| 引脚 7 | PTA5 — Port A bit 5 (GPIO) |
| 引脚 8 | PTA6 — Port A bit 6 (GPIO) |
| 引脚 9 | PTA7 — Port A bit 7 (GPIO) |
| 引脚 10 | VSS — Ground |
| 引脚 11 | PTB0/TxD — Port B bit 0 / SCI transmit (shared) |
| 引脚 12 | PTB1/RxD — Port B bit 1 / SCI receive (shared) |
| 引脚 13 | PTB2 — Port B bit 2 (GPIO) |
| 引脚 14 | PTB3 — Port B bit 3 (GPIO) |
| 引脚 15 | PTB4 — Port B bit 4 (GPIO) |
| 引脚 16 | PTB5 — Port B bit 5 (GPIO) |
| 引脚 17 | PTB6 — Port B bit 6 (GPIO) |
| 引脚 18 | PTB7 — Port B bit 7 (GPIO) |
| 引脚 19 | VDD — Positive supply (4.0 V to 5.5 V) |
| 引脚 20 | VREG — Internal 3.3 V regulator output for USB |
| 引脚 21 | RST — Reset input (active low) |
| 引脚 22 | OSC1 — Crystal oscillator input |
| 引脚 23 | OSC2 — Crystal oscillator output |
| 引脚 24 | PTE0 — Port E bit 0 (GPIO) |
| 引脚 25 | PTE1 — Port E bit 1 (GPIO) |
| 引脚 26 | PTE2 — Port E bit 2 (GPIO) |
| 引脚 27 | PTE3/D+ — USB D+ data line (shared with GPIO) |
| 引脚 28 | PTE4/D- — USB D- data line with 1.5 kOhm pull-up (shared with GPIO) |
| 引脚 29 | PTE5 — Port E bit 5 (GPIO) |
| 引脚 30 | PTE6 — Port E bit 6 (GPIO) |
| 引脚 31 | PTE7 — Port E bit 7 (GPIO) |
| 引脚 32 | NC — Not connected (per datasheet) |
典型应用
MC908JB16FAE 适用于 6 应用s: USB HID Input Device, USB-to-UART Bridge Dongle, Industrial USB Data Logger, Point-of-Sale USB Peripheral, USB Learning and Development Board, Embedded USB Diagnostics Dongle.
USB HID Input Device
The MC908JB16FAE is well suited for USB HID class input devices (mice, keyboards, custom controls, game pads) because its integrated USB 1.1 full-speed device controller eliminates the external USB PHY and serial-jtag converter required by 8051-based designs. The HC08 core at 6 MHz is sufficient for HID polling loops (typically 125 us frame interval) and the 21 GPIO pins map cleanly to scanned matrix keypads, optical sensors, and switch arrays. The 16 KB Flash holds a full HID descriptor table plus custom report logic, and the 384 B RAM covers report buffers and stack. The 1.5 kOhm software-configurable D- pull-up simplifies bus-powered device design where VBUS presence must trigger enumeration.
推荐
USB-to-UART Bridge Dongle
Use the MC908JB16FAE as a CDC/ACM USB-to-UART bridge dongle, replacing FTDI-style cables with a custom firmware implementation. The integrated USB device controller and SCI peripheral (asynchronous serial) give the part a direct bus between the USB endpoint buffers and the UART transmit/receive registers. The 6 MHz bus clock supports CDC line-coding (baud rate up to 921600 bps with appropriate SCI divisor), and the 16 KB Flash accommodates the USB CDC descriptor stack and the UART handler. The internal 3.3 V regulator powers the USB transceiver from the 5 V VBUS, so an external LDO is not required.
推荐
Industrial USB Data Logger
The MC908JB16FAE fits compact industrial USB data loggers where a low-pin-count MCU with USB diagnostics is needed and external interfacing is minimal. The 21 GPIO pins can be allocated to digital sensors, the SCI peripheral connects to RS-485 transceivers via external line drivers, and the integrated LED driver directly indicates logging state without external transistors. The LVD (low-voltage detect) and POR (power-on reset) peripherals handle brown-out recovery, important for industrial environments where supply rails are noisy. The 32-LQFP (7x7 mm) is easy to hand-prototype on 2-layer PCBs.
推荐
Point-of-Sale USB Peripheral
Use the MC908JB16FAE in point-of-sale peripherals (barcode scanners, mag-stripe readers, customer displays) where USB connection to the host PC is mandatory and device firmware is simple HID or vendor-class. The integrated USB 1.1 PHY, on-chip 3.3 V regulator, and 1.5 kOhm pull-up minimize BOM cost for high-volume POS device production. The HC08 core's deterministic interrupt latency suits HID polling, and the 16 KB Flash stores the HID descriptor, scan firmware, and key debounce state machines. The PWM peripheral drives the scanner laser or beeper without external timer ICs.
推荐
USB Learning and Development Board
The MC908JB16FAE was a popular USB learning MCU because it integrates USB with a simple HC08 instruction set, allowing students to study enumeration, HID descriptors, and interrupt-driven USB firmware without an external PHY. Educational kits based on this part include breakout to all 21 GPIO, a USB-B connector, and a BDM (background debug mode) header for in-circuit programming. The 32-LQFP is breadboard-friendly with adapter boards, and the legacy CodeWarrior HC08 toolchain is freely available from Freescale/NXP archives for self-study.
推荐
Embedded USB Diagnostics Dongle
The MC908JB16FAE is suitable for embedded diagnostics dongles that report internal bus voltage, temperature, or error counters to a host PC over USB. Its integrated USB 1.1 device, SCI peripheral for sensor readback, and PWM peripheral for fan or LED control let a small firmware image replace a more expensive processor. The 16 KB Flash accommodates the USB vendor-class driver on the host side plus the on-device diagnostics state machine. The LQFP-32 footprint is footprint-compatible with NXP S08JM60 parts, easing later migration to active NXP silicon for production.
推荐
推荐产品汇总
工程参考数据： MC908JB16FAE ——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 | MC908JB16FPE | MC908JB8FAE | MC908JL16CFJE |
|---|---|---|---|---|
| Package | 32-LQFP (7x7 mm) | 32-LQFP (7x7 mm) - same | 32-LQFP (7x7 mm) - same | 32-LQFP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core Processor | HC08 8-bit | HC08 8-bit | HC08 8-bit | HC08 8-bit |
| Maximum Bus Clock | 6 MHz | 6 MHz | 6 MHz | 8 MHz |
| Program Memory (Flash) | 16 KB | 16 KB | 8 KB | 16 KB |
| RAM Size | 384 B | 384 B | 384 B | 512 B |
| Integrated USB Controller | Yes (USB 1.1 FS device + PHY + 3.3 V reg) | Yes (USB 1.1 FS device + PHY + 3.3 V reg) | Yes (USB 1.1 FS device + PHY + 3.3 V reg) | No (SCI/SPI only) |
| Number of I/O Pins | 21 | 21 | 21 | 23 |
| Operating Temperature | 0 C to +70 C | -40 C to +85 C (industrial) | 0 C to +70 C | -40 C to +85 C (industrial) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete |
关键差异点
- Integrated USB 1.1 PHY + 3.3 V regulator + 1.5 kOhm pull-up （对比 MC908JL16CFJE)
- 16 KB Flash vs 8 KB Flash in the JB8 （对比 MC908JB8FAE)
- Industrial-temperature sibling available （对比 MC908JB16FPE)
设计说明
The MC908JB16FAE operates from a single 4.0 V to 5.5 V supply on VDD; the integrated USB VREG pin must be bypassed with a 1 uF ceramic capacitor to VSS per the datasheet, and a 1.5 kOhm pull-up on D- is software-enabled (not a discrete pull-up). When designing a bus-powered USB device, ensure VBUS is sensed on the RST or a dedicated GPIO so firmware can disconnect the pull-up when VBUS drops. Decouple VDD with 100 nF plus 4.7 uF bulk, placed within 5 mm of the VDD pin.
Do not assume the MC908JB16FAE and the industrial-grade MC908JB16FPE share identical electrical specs; the FPE suffix changes temperature range from 0 C to +70 C to -40 C to +85 C and may differ in Flash endurance specs across lots. Also note that some Freescale-prefixed date codes predate NXP acquisition and may use legacy HC08 BDM pod pinout; the BDM connector pinout is the same across both brands, but tooling firmware in older CodeWarrior HC08 versions may need to be updated. When migrating firmware from the JL16 family (no USB) to the JB16 (with USB), expect to remap shared peripheral pins (e.g., PTB0/TxD, PTE3/D+) and re-initialize the USB module registers.
Place the 32 kHz crystal (or resonator) within 5 mm of OSC1 and OSC2, with a ground guard trace around both pins to minimize EMI pickup into the PLL. Route the USB D+ and D- differential pair as a 90-ohm differential trace, matched within 2 mm of length, and keep them clear of switching signals and clock traces. The D- pull-up resistor (internal, software-enabled) and the VREG capacitor must both be placed on the same side of the package as the USB connector for shortest return paths.
The MC908JB16FAE in the 32-LQFP (7x7 mm) has a moderate theta_JA suitable for handheld and bus-powered devices where current consumption stays below approximately 25 mA. The integrated USB 3.3 V regulator draws from VDD and adds approximately 30 mA when USB is active, so total VDD current with USB enumerated is roughly 50 mA. The 32-LQFP plastic package dissipates this without a heatsink on a standard 2-layer board; for sealed industrial enclosures, add a thermal copper pour under the exposed pad area if available, or vent the enclosure.
合规信息
RoHS, REACH, lead-free, halogen-free status marked [DATA_NEEDED] - not present in the verified web data reviewed. AEC-Q100 not applicable because MC908JB16FAE is a general-purpose MCU without automotive qualification. Compliance verification requires the manufacturer lot-specific datasheet addendum or a NXP product compliance statement.