MC908JL3EMDWE - HC08 8-bit MCU 4KB Flash 128B RAM 28-SOIC | NXP
料号： MC908JL3EMDWE ⚠ 最后一次采购| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.4431 | $5.44 |
| 10 | $4.89 | $48.90 |
| 100 | $4.12 | $412.00 |
| 500 | $3.42 | $1,710.00 |
| 1,000 | $2.78 | $2,780.00 |
MC908JL3EMDWE 概述
Background: An 8-bit microcontroller is a small, self-contained computing element built around an 8-bit central processing unit (CPU), on-chip non-volatile program memory (Flash or ROM), volatile data memory (RAM), and a fixed set of peripherals such as timers, ADC, and serial interfaces. 8-bit MCUs occupy the low-power, low-cost end of the microcontroller taxonomy and sit beneath 16-bit, 32-bit (for example ARM Cortex-M0) and 64-bit microcontroller cores in computing power but typically above simple programmable logic and discrete timer circuits in integration. The HC08 family is one of the long-running M68HC08 architectures from Motorola/Freescale/NXP, optimized for cost-sensitive consumer, appliance, and industrial control applications.
Key features: the JTAG/Flash-resident debug interface supports in-circuit programming and real-time emulation; the 10-bit ADC with 8 channels provides enough resolution for sensor conditioning in HVAC, white goods, and simple motor control loops; the internal oscillator and PLL-less clocking simplify external BOM; and the security lock on Flash prevents unauthorized code readout. The 28-SOIC (wide-body) package with 0.295 inch (7.50 mm) body width supports hand-soldering-friendly prototyping while still being compatible with standard SOIC-28 land patterns.
From an architecture standpoint, the device uses the Freescale HC08 CISC-style core with a 16-bit stack pointer and 8-bit accumulator-based CPU, which keeps interrupt latency predictable for small real-time loops. The peripheral set is mapped through a memory-mapped register model rather than a modern peripheral-mapped descriptor scheme.
Typical applications include low-cost white-goods controllers (rice cookers, washing-machine user interfaces), thermostats and HVAC controllers, simple sensor-interface boards, remote controls, and replacement of legacy HC11 designs where modest code size, low power, and minimal external components are the deciding requirements.
Design tip: when migrating from the HC08 to a newer S08 platform (such as S08JM or S08QD families), pinout is generally not drop-in and code tools (CodeWarrior HC08 versus CodeWarrior S08) differ. Plan for compilation and pin re-mapping effort when designing in the JL3 if future migration is a possibility.
This page synthesizes distributor stock data, lifecycle notes, drop-in alternatives, and practical design commentary not found in the Freescale/NXP datasheet alone.
直接替换替代料： MC908JL3EMDWE ——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： MC908JL3EMDWE （相同外形与封装尺寸） ——差异在于 Package, Product Type, Data Bus Width, Family, Program Memory Size.
快速对比工具——选择替代料号进行并排对比：
MCR908JL3EMDWE
✅ 直接替换📋 参考替代料（不在目录中）
MC908JL3ECDWE
✅ 直接替换✓ 有现货
$6.0657 / 个
查看数据手册 →MC908JL3EMDWE-FR
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →MCR908JL3ECDWE
✅ 直接替换✓ 有现货
$4.45 / 个
查看数据手册 →MC908JL8CDWE
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$5.45 / 个
查看数据手册 →MC908JL3EMDWE 最大额定值与电气特性
| Manufacturer | NXP USA Inc. (formerly Freescale Semiconductor) |
| Product Type | 8-bit Microcontroller (MCU) |
| Core Architecture | HC08 (M68HC08 family), 8-bit CISC |
| Program Memory | 4 KB Flash (4K x 8) |
| RAM | 128 B |
| CPU Clock Speed | 8 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V (data shown for 5 V operation) |
| A/D Converter | 10-bit, up to 8 channels |
| 封装 | 28-SOIC W (wide-body, 0.295 inch / 7.50 mm) |
| 引脚数量 | 28 |
| 安装类型 | Surface Mount |
MC908JL3EMDWE 引脚配置
| 引脚 1 | IRQ — External interrupt request input (with internal pull-up) |
| 引脚 2 | TCLK — Timer external clock input |
| 引脚 3 | RST — Active-low reset input |
| 引脚 4 | VSS — Ground |
| 引脚 5 | VDD — Supply voltage |
| 引脚 6 | PTA0/TCH0 — Port A bit 0 / Timer Channel 0 |
| 引脚 7 | PTA1/TCH1 — Port A bit 1 / Timer Channel 1 |
| 引脚 8 | PTA2 — Port A bit 2 |
| 引脚 9 | PTA3 — Port A bit 3 |
| 引脚 10 | PTA4 — Port A bit 4 |
| 引脚 11 | PTA5 — Port A bit 5 |
| 引脚 12 | PTA6 — Port A bit 6 |
| 引脚 13 | PTA7 — Port A bit 7 |
| 引脚 14 | PTB0/AD0 — Port B bit 0 / ADC channel 0 |
| 引脚 15 | PTB1/AD1 — Port B bit 1 / ADC channel 1 |
| 引脚 16 | PTB2/AD2 — Port B bit 2 / ADC channel 2 |
| 引脚 17 | PTB3/AD3 — Port B bit 3 / ADC channel 3 |
| 引脚 18 | PTB4/AD4 — Port B bit 4 / ADC channel 4 |
| 引脚 19 | PTB5/AD5 — Port B bit 5 / ADC channel 5 |
| 引脚 20 | PTB6/AD6 — Port B bit 6 / ADC channel 6 |
| 引脚 21 | PTB7/AD7 — Port B bit 7 / ADC channel 7 |
| 引脚 22 | PTC0/SPSCK — Port C bit 0 / SPI clock |
| 引脚 23 | PTC1/MOSI — Port C bit 1 / SPI MOSI |
| 引脚 24 | PTC2/MISO — Port C bit 2 / SPI MISO |
| 引脚 25 | PTC3/SS — Port C bit 3 / SPI slave select |
| 引脚 26 | PTC4/TxD — Port C bit 4 / SCI TxD |
| 引脚 27 | PTC5/RxD — Port C bit 5 / SCI RxD |
| 引脚 28 | PTC6/OSC — Port C bit 6 / Oscillator |
典型应用
MC908JL3EMDWE 适用于 6 应用s: White-Goods Appliance Controllers, HVAC Thermostat and Sensor Interface Boards, Universal Remote and Toy Controllers, Industrial Sensor Pre-Processing Modules, Legacy HC11 Replacement Boards, Low-Cost Educational and Trainer Boards.
White-Goods Appliance Controllers
The MC908JL3EMDWE is well-suited to white-goods controllers such as rice cookers, washing-machine user interface boards, and microwave key panels where BOM cost dominates MCU selection. Its 4 KB Flash and 128 B RAM are sufficient to host state-machine control firmware for timers, mode-selection logic, and relay driving, while the integrated 10-bit ADC reads NTC thermistors and sense resistors. The 28-SOIC W package is hand-solder friendly, easing small-scale prototype work. Pin-for-pin compatibility with the JL8 allows a single PCB layout to serve both entry-level and feature-rich SKUs.
推荐
HVAC Thermostat and Sensor Interface Boards
Designed into low-cost HVAC thermostat or sensor-interface boards, the MC908JL3EMDWE provides 8-channel 10-bit ADC resolution adequate for thermistor temperature sensing and potentiometer-based temperature setpoint reading, plus a UART for remote or wired-networking modules. The 8 MHz CPU rate and CISC single-byte instruction reach are sufficient for proportional-control loops running at sub-second update rates. The 28-pin SOIC W footprint simplifies routing alongside relay drivers and triacs. For non-critical indoor climate appliances, this HC08 remains a cost-effective, well-supported choice.
推荐
Universal Remote and Toy Controllers
The MC908JL3EMDWE is appropriately scaled for toy controllers, IR remote controls, and small consumer devices that need PWM output, a UART/SPI interface, and low sleep current. The HC08's tiny RAM footprint and clean interrupt structure permit real-time IR protocol generation (RC5, NEC) while free timers drive PWM for motor/LED animation. Because the part remains in last-time-buy, designers targeting this application should validate long-term supply with NXP before committing high-volume SKUs.
推荐
Industrial Sensor Pre-Processing Modules
Industrial sensor pre-processing modules (e.g., strain-gauge bridge excitation units, isolated signal-conditioner boards) can host the MC908JL3EMDWE for local calibration, averaging, and digital conversion of multiple analog channels. The 10-bit ADC quantizes sensor output, while the SCI serves as a downstream diagnostics or tower-line interface. Designers will appreciate the deterministic HC08 interrupt latency for time-stamping sample pipelines. Note the part is in last-time-buy; for new designs, choose a NXP S08QD-family successor instead.
推荐
Legacy HC11 Replacement Boards
Engineers retrofitting outdated HC11-based boards often migrate to the MC908JL3EMDWE because the HC08 core preserves the M68K-derived programming model and absolute-addressed register set, minimizing firmware churn. Its 28-SOIC W package likewise fits legacy pads designed for SOJ or DIP-style controllers. The new part adds Flash and an integrated ADC, replacing multiple support parts. Use as a bridge component while larger code-base rewrites are scheduled over a multi-quarter plan.
推荐
Low-Cost Educational and Trainer Boards
Because the MC908JL3EMDWE is widely documented, widely stocked second-hand, and ships in a hand-solderable 28-SOIC package, it is a popular target for university microcontroller labs and product-training kits. Programming tools such as P&E USB-ML-08 plus CodeWarrior HC08 IDE give students a real-world debugging experience including single-stepping, watchdogs, and Flash security. Even at last-time-buy status, distributor stock levels (Heisener lists >1 million pieces) keep lab replenishment feasible through at least one calendar year.
推荐
推荐产品汇总
工程参考数据： MC908JL3EMDWE ——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 | MCR908JL3EMDWE | MC908JL3ECDWE | MC908JL3EMDWE-FR | MCR908JL3ECDWE | MC908JL8CDWE |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors (Rochester) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors (Rochester) | NXP Semiconductors |
| Package | 28-SOIC W | 28-SOIC W - same | 28-SOIC W - same | 28-SOIC W - same | 28-SOIC W - same | 28-SOIC W - 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 | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 8 KB |
| RoHS / Reflow Profile | JEDEC Pb-free reflow (E suffix) | JEDEC Pb-free reflow (E suffix) | Non-JEDEC leaded (C suffix) | Freescale JEDEC Pb-free factory reel | Non-JEDEC leaded via Rochester | Non-JEDEC leaded (C suffix) |
| Lifecycle Status | Last-Time-Buy (EOL announced) | Active (Rochester after-market) | Last-Time-Buy (EOL announced) | Last-Time-Buy (Freescale original) | Active (Rochester after-market) | Last-Time-Buy (EOL announced) |
关键差异点
- Rochester authorized after-market guarantees long-term supply （对比 MC908JL3ECDWE)
- Pin-for-pin compatible across E and EMDWE variants （对比 MC908JL8CDWE)
- Heisener distributor showed >1 million-piece stock as of 2026-10-18 （对比 Other EOL HC08 variants)
设计说明
The MC908JL3EMDWE operates from a single 2.7 V to 5.5 V supply on the VDD pin (pin 5), with VSS (pin 4) as ground. Decouple VDD with a 100 nF ceramic bypass placed within 5 mm of the VDD pin and a bulk 10 uF aluminum or tantalum at the regulator output. The internal regulator can be susceptible to noise coupling during in-circuit programming; isolate VDD from relay-driver rails using a ferrite bead or LC pi-filter when the MCU shares a supply with inductive loads.
Route ADC inputs (PTB0 through PTB7) with short traces and avoid running them parallel to switching-relay drive signals. Use a separate analog ground island under the ADC-sensitive pads and join it to VSS only at the MCU VSS pin. The 28-SOIC W package leaves sufficient room for a ground pour on a 2-layer board; on 4-layer stack-ups, place a dedicated ground plane directly under the SOIC to minimize digital switching noise coupling into the analog ports.
Estimated: the 28-SOIC W body width is 7.50 mm (0.295 in) - this is the wide-body SOIC, not the narrow SOIC-28 used on SOP-8-class parts. Library symbols labeled 'SOIC-28' from generic PCB libraries are typically SO-16-width; ensure the footprint references 1.27 mm pitch between pins and a 7.50 mm body to match the MC908JL3EMDWE. Misfootprints commonly require hand-soldering rework because no commercial socketed adapter fits.
The HC08 IRQ pin (pin 1) is edge-sensitive with an internal pull-up configuration, but shares an interrupt vector with other peripherals. To debounce mechanical switches wired to IRQ, add a 100 nF cap to GND and a 10 kohm series resistor. The OSC pin (pin 28) should not be used as a GPIO without removing the internal oscillator option, which can lock the MCU if the configuration bits are inconsistent.
Because NXP has flagged the MC908JL3EMDWE as last-time-buy/end-of-life, any new design should NOT be based on the JL3 raw MPN alone. Place parallel-source orders that also cover MCR908JL3EMDWE (Rochester Electronics authorized after-market) and MC908JL3EMDWE-FR (Freescale original factory reel). For new greenfield designs, migrate to the S08QD or S08JM family - same HC08/S08 toolchain experience but modern peripherals and active roadmap.
合规信息
Verified web data does not surface explicit RoHS/REACH statements; the E suffix in the MPN denotes JEDEC Pb-free reflow profile per NXP naming convention, but the formal compliance certificate was not present in the search results and is marked [DATA_NEEDED]. The part is not AEC-Q100 qualified and is not intended for automotive use.
