MC68HRC908JK3CDW - 8-bit HC08 MCU, 4KB Flash, 20-SOIC | NXP
料号： MC68HRC908JK3CDW ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.1 | $4,100.00 |
MC68HRC908JK3CDW 概述
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, RAM, and peripheral interfaces into one package. The HC08 family, a successor to the HC05 family, sits within the broader taxonomy of microcontrollers -> embedded processors -> semiconductor ICs. MC68HRC908JK3CDW operates from a 3.3 V or 5 V supply and uses a CISC (Complex Instruction Set Computer) architecture, providing byte- and bit-manipulation instructions useful for control-oriented applications.
Key features include 4 KB of Flash program memory (4K x 8), 128 bytes of on-chip RAM, on-chip LED drive capability, an LVD module for brown-out protection, internal POR, PWM channels, and 15 I/O lines. The HCMOS silicon process enables low-power operation and high noise immunity. The 20-pin SOIC (SO-20) package supports standard surface-mount assembly.
The architecture is based on the M68HC08 CPU core, which shares object code compatibility with the earlier HC05 family while adding new addressing modes and stack instructions. Internal buses, registers, and a small instruction pipeline deliver deterministic interrupt response, which simplifies firmware development for motor control and user-interface tasks.
Typical applications include low-end appliance controls, simple user-interface boards, LED indicator panels, sensor signal conditioning, and small consumer products. Designers select this part when 4 KB of Flash and 15 I/O are sufficient and when cost, rather than peripherals, drives the bill of materials.
A key design consideration is supply voltage: the device is rated for both 3.3 V and 5 V operation, but firmware timing parameters differ between ranges, so consult the datasheet electricals. Also note that the part status is Obsolete, meaning last-time-buy commitments should be confirmed before new design-ins.
This page synthesizes distributor pricing, drop-in same-brand and cross-brand alternatives, application guidance, and design notes not found in the manufacturer datasheet alone, helping engineers migrate off the obsolete MC68HRC908JK3CDW with verified substitutes.
直接替换替代料： MC68HRC908JK3CDW ——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： MC68HRC908JK3CDW （相同外形与封装尺寸） ——差异在于 Core Architecture, Package.
快速对比工具——选择替代料号进行并排对比：
MC68HRC908JK3CDWE
✅ 直接替换📋 参考替代料（不在目录中）
MC908JK3ECDWE
✅ 直接替换✓ 有现货
$4.78 / 个
查看数据手册 →MC908JK3CDWE
✅ 直接替换📋 参考替代料（不在目录中）
MC68HRC908JL3CDW
✅ 直接替换📋 参考替代料（不在目录中）
MC68HRC908JK1CDW
✅ 直接替换📋 参考替代料（不在目录中）
MC68HRC908JK3CDW 最大额定值与电气特性
| Core Processor | HC08 |
| Core Size | 8-Bit |
| Core Architecture | CISC (M68HC08) |
| CPU Speed | 8 MHz |
| Program Memory Size | 4 KB (4K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 128 x 8 (128 bytes) |
| EEPROM Size | Not specified |
| Number of I/O | 15 |
| Peripherals | LED, LVD, POR, PWM |
| Connectivity | Not specified |
| 电源电压 | 3.3 V / 5 V |
| 封装 | 20-SOIC (W) |
| 安装类型 | Surface Mount |
| Part Status | Obsolete |
| Series | HC08 |
| Process Technology | HCMOS |
MC68HRC908JK3CDW 引脚配置
| 引脚 1 | PTA0/ATD0 — Port A bit 0 / ATD input |
| 引脚 2 | PTA1/ATD1 — Port A bit 1 / ATD input |
| 引脚 3 | PTA2/ATD2 — Port A bit 2 / ATD input |
| 引脚 4 | PTA3/ATD3 — Port A bit 3 / ATD input |
| 引脚 5 | VDD — Supply voltage (3.3 V or 5 V) |
| 引脚 6 | VSS — Ground |
| 引脚 7 | OSC1 — Oscillator input / external clock |
| 引脚 8 | OSC2 — Oscillator output |
| 引脚 9 | RESET — Reset input (active low) |
| 引脚 10 | PTB0/TCLK — Port B bit 0 / timer clock input |
| 引脚 11 | PTB1/TCH0 — Port B bit 1 / timer channel 0 |
| 引脚 12 | PTB2/TCH1 — Port B bit 2 / timer channel 1 |
| 引脚 13 | PTB3 — Port B bit 3 |
| 引脚 14 | PTB4 — Port B bit 4 |
| 引脚 15 | PTB5 — Port B bit 5 |
| 引脚 16 | PTC0 — Port C bit 0 |
| 引脚 17 | PTC1 — Port C bit 1 |
| 引脚 18 | PTC2 — Port C bit 2 |
| 引脚 19 | PTC3 — Port C bit 3 |
| 引脚 20 | IRQ — External interrupt request |
典型应用
MC68HRC908JK3CDW 适用于 6 应用s: Low-End Appliance Control, LED Indicator Panels, Simple User-Interface Boards, Sensor Signal Conditioning, Small Consumer Products, Industrial Timer / Counter Modules.
Low-End Appliance Control
The MC68HRC908JK3CDW's 4 KB Flash, 15 I/O pins, and integrated PWM make it a strong fit for low-end appliance control boards such as simple washing-machine timers, rice cookers, and microwave user-interface panels. Its 3.3 V/5 V supply flexibility lets designers reuse a single PCB across regions with different mains-side rail voltages, and the HC08 CISC core's bit-manipulation instructions simplify direct GPIO control of relays and triacs.
推荐
LED Indicator Panels
With on-chip LED drive peripherals, the MC68HRC908JK3CDW can directly sink or source LED arrays for status-indicator panels in industrial equipment, vending machines, and consumer appliances. The integrated LED module reduces BOM cost by eliminating external transistor drivers, while the HC08's 8 MHz CPU executes multiplexing routines fast enough to drive 7-segment or dot-matrix displays without flicker.
推荐
Simple User-Interface Boards
The 15 I/O pins on the MC68HRC908JK3CDW comfortably support 4x4 keypads, rotary encoders, and small LCD character displays found in entry-level user-interface boards. The HC08's CISC instructions speed up scan loops, and the 128-byte RAM is sufficient for key-debounce buffers and LCD refresh data. Designers add a small external character LCD and use PWM to drive backlight brightness, all from a single 5 V rail.
推荐
Sensor Signal Conditioning
In simple sensor-interface boards for thermistors, photocells, or Hall-effect switches, the MC68HRC908JK3CDW reads analog or digital sensor signals through 15 I/O pins and applies calibration in firmware. The LVD peripheral protects against brown-out when sensor supplies sag, while the POR ensures a clean startup. Its 4 KB Flash stores lookup tables and calibration constants for cost-sensitive IoT edge nodes.
推荐
Small Consumer Products
Cost-driven consumer gadgets such as remote controls, electronic toys, and personal-care devices use the MC68HRC908JK3CDW because its 4 KB Flash, 128-byte RAM, and PWM/LED peripherals fit the small-footprint BOM. The HC08's low power HCMOS process extends battery life, and the 20-SOIC package is hand-solderable for prototyping. Designers often pair this MCU with a single-cell AA or AAA supply at 3.3 V.
推荐
Industrial Timer / Counter Modules
The MC68HRC908JK3CDW's on-chip PWM and timer channels make it suitable for industrial timer/counter modules such as conveyor dwell-time controllers, pump cycle counters, and process-on timers. The 8 MHz CPU executes timing algorithms deterministically thanks to the HC08 interrupt structure, and the LVD peripheral shuts the output down safely during brown-out events. The 20-SOIC package fits standard DIN-rail timer board layouts.
推荐
推荐产品汇总
工程参考数据： MC68HRC908JK3CDW ——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 | MC68HRC908JK3CDWE | MC908JK3ECDWE | MC908JK3CDWE | MC68HRC908JL3CDW | MC68HRC908JK1CDW |
|---|---|---|---|---|---|---|
| Package | 20-SOIC (W) | 20-SOIC (W) - same | 20-SOIC (W) - same | 20-SOIC (W) - same | 20-SOIC (W) - same | 20-SOIC (W) - same |
| Brand | NXP Semiconductors (formerly Freescale/Motorola) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core Processor | HC08 (8-bit CISC) | HC08 | HC08 | HC08 | HC08 | HC08 |
| CPU Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Program Memory (Flash) | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 1.5 KB |
| RAM Size | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Number of I/O | 15 | 15 | 15 | 15 | 23 | 15 |
| Supply Voltage | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
关键差异点
- Legacy HC08 family with established toolchain support （对比 MC908JK3CDWE)
- Higher Flash density than JK1 variant （对比 MC68HRC908JK1CDW)
- More compact I/O count fits low-pin-count designs （对比 MC68HRC908JL3CDW)
设计说明
The MC68HRC908JK3CDW operates from a single 3.3 V or 5 V supply. Add a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 5) and a bulk 10 uF tantalum or aluminum capacitor near the supply entry to suppress digital switching noise. The internal POR holds the device in reset until VDD crosses the POR threshold, so a clean rising supply is essential for reliable startup.
Because the part is marked Obsolete by NXP, do not design it into new production boards without a confirmed last-time-buy plan. Designers should evaluate modern NXP S08 replacements such as the MC9S08QD4J2MSCR or Kinetis E MCUs (e.g., MKE04Z64VLK4R) for new designs. When migrating, note that the HC08 CISC instruction set is not binary-compatible with the S08 core; firmware must be recompiled and re-validated.
Route the OSC1/OSC2 traces short and symmetric, and place the crystal/ceramic resonator within 5 mm of the pins to minimize parasitic capacitance and EMI. Keep the RESET line free of noise by adding a 10 kohm pull-up to VDD and a 100 nF capacitor to VSS for debounce. Avoid routing high-current switching traces adjacent to the analog-capable PTA pins to prevent digital noise coupling into measurements.
合规信息
Compliance status not explicitly listed in the verified web data; the W suffix on the part number suggests Pb-free terminal finish per Freescale/NXP convention, but RoHS/REACH statements were not found in the provided snippets. AEC-Q100 not applicable - this is a general-purpose MCU not qualified for automotive safety.
