MC908JL3EMDWE - HC08 8-bit MCU 4KB Flash 128B RAM 28-SOIC | NXP
MPN: MC908JL3EMDWE ⚠ Lần mua cuốiMC908JL3EMDWE Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho MC908JL3EMDWE — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MC908JL3EMDWE (cùng hình factor và footprint) — khác nhau ở Package, Product Type, Data Bus Width, Family, Program Memory Size.
MCR908JL3EMDWE
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC908JL3ECDWE
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC908JL3EMDWE-FR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MCR908JL3ECDWE
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC908JL8CDWE
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MC908JL3EMDWE Tỷ lệ tối đa & tính chất điện
| 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 |
| Hộp | 28-SOIC W (wide-body, 0.295 inch / 7.50 mm) |
| Số chân | 28 |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân MC908JL3EMDWE
| Chân 1 | IRQ — External interrupt request input (with internal pull-up) |
| Chân 2 | TCLK — Timer external clock input |
| Chân 3 | RST — Active-low reset input |
| Chân 4 | VSS — Ground |
| Chân 5 | VDD — Supply voltage |
| Chân 6 | PTA0/TCH0 — Port A bit 0 / Timer Channel 0 |
| Chân 7 | PTA1/TCH1 — Port A bit 1 / Timer Channel 1 |
| Chân 8 | PTA2 — Port A bit 2 |
| Chân 9 | PTA3 — Port A bit 3 |
| Chân 10 | PTA4 — Port A bit 4 |
| Chân 11 | PTA5 — Port A bit 5 |
| Chân 12 | PTA6 — Port A bit 6 |
| Chân 13 | PTA7 — Port A bit 7 |
| Chân 14 | PTB0/AD0 — Port B bit 0 / ADC channel 0 |
| Chân 15 | PTB1/AD1 — Port B bit 1 / ADC channel 1 |
| Chân 16 | PTB2/AD2 — Port B bit 2 / ADC channel 2 |
| Chân 17 | PTB3/AD3 — Port B bit 3 / ADC channel 3 |
| Chân 18 | PTB4/AD4 — Port B bit 4 / ADC channel 4 |
| Chân 19 | PTB5/AD5 — Port B bit 5 / ADC channel 5 |
| Chân 20 | PTB6/AD6 — Port B bit 6 / ADC channel 6 |
| Chân 21 | PTB7/AD7 — Port B bit 7 / ADC channel 7 |
| Chân 22 | PTC0/SPSCK — Port C bit 0 / SPI clock |
| Chân 23 | PTC1/MOSI — Port C bit 1 / SPI MOSI |
| Chân 24 | PTC2/MISO — Port C bit 2 / SPI MISO |
| Chân 25 | PTC3/SS — Port C bit 3 / SPI slave select |
| Chân 26 | PTC4/TxD — Port C bit 4 / SCI TxD |
| Chân 27 | PTC5/RxD — Port C bit 5 / SCI RxD |
| Chân 28 | PTC6/OSC — Port C bit 6 / Oscillator |
Ứng dụng tiêu biểu
MC908JL3EMDWE phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC908JL3EMDWE — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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) |
Bảo phân biệt quan trọng
- Rochester authorized after-market guarantees long-term supply (vsMC908JL3ECDWE)
- Pin-for-pin compatible across E and EMDWE variants (vsMC908JL8CDWE)
- Heisener distributor showed >1 million-piece stock as of 2026-10-18 (vsOther EOL HC08 variants)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
