MCR908JK3ECDWE - 8-Bit 8MHz 4KB Flash MCU | NXP
MPN: MCR908JK3ECDWE ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MCR908JK3ECDWE Overview
The M68HC08 family is based on the customer-specified integrated circuit, or CSIC, design strategy and uses the enhanced M68HC08 CPU08 core. HC08 devices combine a compact 8-bit embedded-control architecture with integrated flash memory, RAM, digital I/O, and application-specific peripherals. They are intended for cost-sensitive embedded systems where a deterministic controller, modest program storage, and compact packaging are more important than high computational throughput.
Verified distributor information identifies the MCR908JK3ECDWE as a 20-SOIC, 8 MHz, 4 KB flash MCU with 128 x 8 RAM and 15 I/O pins. The Mouser listing also identifies LED, low-voltage detection, power-on reset, PWM, and A/D-related characteristics. The manufacturer product page describes the HC08JK family as part of the M68HC08 family and confirms the CPU08 architecture. These details make the part suitable for compact control, sensing, and signal-generation designs.
The 4 KB flash capacity and 128-byte RAM support small embedded-control programs, while the 15 available I/O pins provide connections for sensors, indicators, actuators, and control logic. The 8 MHz CPU08 operating speed is appropriate for basic sequencing, sampling, debouncing, and low-bandwidth control tasks. The exact ADC resolution, supply limits, timing characteristics, oscillator frequency range, and pin-level multiplexing were not supplied in the verified data and must be confirmed in the manufacturer datasheet before design release.
Typical applications include small industrial control modules, keypad interfaces, simple sensor nodes, LED status controllers, motor or valve sequencing, and compact consumer products. The 20-pin SOIC package supports conventional through-hole assembly and hand or fixture-based production. Because the listed device is marked end-of-life by NXP, engineers should verify availability, legacy-programming support, and any approved replacement before starting a new design.
The primary design consideration is not maximum performance but controlled deployment: validate the exact ADC, oscillator, memory, and electrical limits, confirm software-toolchain support, and plan for end-of-life supply risk. The verified data does not provide a manufacturer PDF URL, detailed pinout, absolute maximum ratings, or verified pricing. Those fields are marked for data acquisition rather than inferred from generic HC08 family assumptions.
This page combines verified distributor and manufacturer information with an explicit uncertainty record, helping engineers distinguish confirmed MCR908JK3ECDWE specifications from parameters that still require datasheet confirmation. It also records why drop-in alternatives were not listed: the supplied cross-reference results did not establish a qualified, pin-compatible replacement.
Drop-in alternatives for MCR908JK3ECDWE — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MCR908JK3ECDWE (same form factor and footprint) — differing in Package, Mounting Type, Number of I/O Pins, Core Architecture, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesMCR908JK3ECDWE Maximum Ratings & Electrical Characteristics
| Core Processor | HC08 / CPU08, 8-bit |
| Product Family | HC08JK, M68HC08 family |
| Maximum CPU Speed | 8 MHz |
| Program Memory Size | 4 KB (4K x 8) flash |
| RAM Size | 128 x 8 bits |
| Number of I/O Pins | 15 |
| Package | 20-SOIC |
| Case Dimensions | 0.295 inch / 7.50 mm width |
| Supply Voltage | 3 V |
| Oscillator Type | External |
| Architecture | CISC |
| Peripherals | LED, LVD, POR, PWM, A/D-related |
| Packaging | Tube |
| Manufacturer Status | End of Life |
| Mounting Type | Surface mount / SOIC |
| Program Memory Type | Flash |
| Connectivity | Not specified |
MCR908JK3ECDWE 0.295 inch / 7.50 mm width Pin Configuration Guide
Pin configuration for MCR908JK3ECDWE (0.295 inch / 7.50 mm width package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for MCR908JK3ECDWE.
Refer to the datasheet for full pin configuration.
Typical Applications
MCR908JK3ECDWE is suitable for 6 applications: Compact Sensor Control Node, LED Status and Keypad Interface, Small Motor and Valve Sequencer, Basic Industrial Control Module, Battery-Powered Embedded Controller, Legacy Consumer Appliance Controller.
Compact Sensor Control Node
The MCR908JK3ECDWE fits a small sensing and control node because it combines an 8 MHz CPU08 core, 15 I/O pins, 128 bytes of RAM, and a listed A/D-related capability. A typical circuit would connect the MCU to a resistive sensor or switch input, use local digital outputs to drive an indicator or actuator, and execute periodic sampling and threshold logic. The 4 KB flash budget favors a focused control loop rather than a large application framework. Before layout, verify the ADC resolution, analog-pin multiplexing, input limits, sampling timing, and supply requirements in the manufacturer datasheet. The external oscillator designation also means the clock source must be provided according to the final timing design.
Recommended
LED Status and Keypad Interface
For an LED status panel or keypad interface, the MCR908JK3ECDWE provides enough digital I/O and processing speed for debouncing, scanning, state transitions, and indicator updates. Its 8 MHz CPU08 core can execute deterministic control tasks, while the listed LED-related characteristics provide a fit for status signaling. The 128-byte RAM is suitable for a small state table or scan buffer, but not for storing large display data. Firmware should define debounce timing, key rollover behavior, LED current limits, and update latency. Because the verified data does not include exact port drive strength or absolute maximum ratings, resistor values and driver interfaces should be confirmed against the official electrical specifications.
Recommended
Small Motor and Valve Sequencer
The MCR908JK3ECDWE can supervise a simple motor, valve, relay, or stepper-related sequence when the design requires deterministic timing rather than high processing bandwidth. The listed PWM peripheral may assist with actuator control, while the 15 I/O pins can support sensors, status LEDs, and interlocks. The MCU’s 4 KB flash and 128-byte RAM limit the complexity of the control algorithm, so hard real-time sequencing should be kept compact and carefully bounded. Validate PWM frequency, timer resolution, output drive limits, startup behavior, and inductive-load protection against the datasheet. A MOSFET or driver stage may be needed; the MCU should not be assumed to directly drive a motor or relay without verified current and voltage ratings.
Recommended
Basic Industrial Control Module
A legacy industrial control module can use the MCR908JK3ECDWE for local sequencing, discrete input monitoring, relay logic, and status reporting. Its 3 V operating context, 8 MHz CPU08 core, 15 I/O pins, and listed LVD, POR, PWM, and A/D-related functions align with compact embedded-control designs. The device should not be treated as automatically suitable for every industrial environment because the verified data does not state operating temperature, isolation, EMC, ESD, or qualification details. Confirm those requirements in the official documentation and use appropriate input protection, transient suppression, isolation, and surge design around the MCU. For new industrial products, the end-of-life status makes replacement planning especially important.
Recommended
Battery-Powered Embedded Controller
The MCR908JK3ECDWE may be suitable for a small battery-powered controller if the firmware and wake behavior remain within the available 4 KB flash and 128 bytes of RAM. The 8 MHz CPU08 core can handle low-bandwidth sensing, periodic control, and state updates, while the external oscillator specification allows the system designer to select the timing source deliberately. Power consumption, sleep modes, wake-up sources, and analog leakage were not provided in the verified data, so battery-life calculations cannot be completed from the supplied records. Validate low-power requirements, regulator efficiency, load-switch behavior, and startup current in the manufacturer datasheet before committing to a compact energy-harvesting or portable product.
Recommended
Legacy Consumer Appliance Controller
The MCR908JK3ECDWE can be used for a legacy appliance or consumer subassembly where a compact 8-bit controller handles button inputs, LEDs, timing, and simple actuator commands. Its small memory footprint is suitable for a single-purpose control loop and its 20-SOIC package simplifies through-hole-style assembly compared with very small leadless packages. The verified data confirms the HC08JK family, 8 MHz speed, 4 KB flash, 128 bytes of RAM, 15 I/O pins, and listed PWM and A/D-related peripherals. Exact display, communication, and safety interfaces are not specified, so they must be added only after checking pin multiplexing and timing. The end-of-life status requires a supply and migration plan for any new production release.
Recommended
Recommended Products Summary
Engineering reference data for MCR908JK3ECDWE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Brand | NXP Semiconductors |
| Package | 20-SOIC |
| Core / Architecture | HC08 CPU08, 8-bit CISC |
| Maximum Speed | 8 MHz |
| Flash Memory | 4 KB (4K x 8) |
| RAM | 128 x 8 bits |
| I/O Pins | 15 |
| Supply Voltage | 3 V |
| Oscillator | External |
| Peripherals | LED, LVD, POR, PWM, A/D-related |
| Lifecycle Status | End of Life |
Key Differentiators
- Confirmed compact HC08 control resource set (vs MC908JK1ECDWE)
- Specific end-of-life sourcing context (vs MC908JK3ECDWE)
- Verified 15-pin I/O allocation (vs MC908JK3CDWE)
Design Notes
Do not substitute the confirmed package and memory specifications for an unverified pin-compatible part. The supplied cross-reference results contain related HC08 devices, but they do not establish identical pin mapping, pin multiplexing, ADC behavior, reset configuration, or software compatibility. Before any replacement is approved, compare the manufacturer package drawing and complete pinout, power pins, oscillator connections, I/O direction, and every peripheral signal. The MCR908JK3ECDWE is an end-of-life part, so undocumented substitutions create both hardware and software qualification risk.
Design the 20-SOIC footprint from the official package drawing rather than from the generic package name. Confirm pin pitch, lead width, body width, and solder-pad geometry against the manufacturer drawing. Keep power and ground connections short and provide the decoupling arrangement required by the datasheet. Because the exact pinout is absent from the verified results, reserve schematic and layout review for confirmation of power pins, external oscillator pins, reset, and all 15 I/O assignments before fabrication.
Treat the 3 V operating context as a confirmed product attribute, but do not infer regulator headroom or I/O voltage limits from it. Verify minimum and maximum supply voltage, startup requirements, power consumption, and I/O injection limits in the official datasheet. External clock circuitry should be designed around the device’s specified oscillator requirements, not around an assumed internal oscillator. Add appropriate supply filtering and verify that external sensors, LEDs, and actuator drivers do not exceed the MCU’s electrical limits.
Compliance Information
The supplied verified results do not provide reliable RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations for MCR908JK3ECDWE. The manufacturer product page lists Environmental Quality and End of Life information, but no explicit compliance conclusion was included in the supplied data.