MC908JK3EMDWE574 - 8-Bit HC08 Microcontroller | NXP/Freescale
MPN: MC908JK3EMDWE574 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.9 | $6.90 |
| 10 | $6.21 | $62.10 |
| 100 | $5.52 | $552.00 |
| 500 | $4.83 | $2,415.00 |
| 1,000 | $4.14 | $4,140.00 |
MC908JK3EMDWE574 Overview
A microcontroller (MCU) is a complete computing system on a single integrated circuit, combining a processor core, memory, and peripherals such as timers and I/O ports. The HC08 family from Motorola/Freescale is a widely deployed 8-bit controller line descended from the HC05, offering an enhanced instruction set, on-chip flash memory, and low-power operation. Within the embedded systems hierarchy, the MC908JK3 sits in the small-package, cost-sensitive MCU segment used for basic control tasks rather than compute-intensive processing.
The MC908JK3 family is characterized by on-chip flash program memory, an HC08 CPU core operating from a single supply, integrated timer modules, multi-purpose I/O ports, and low-power wait and stop modes. The E suffix and the MDWE574 ordering code denote specific package, temperature-grade, and assembly options defined in the manufacturer ordering information, which buyers should confirm against the official datasheet before design-in.
Technically, HC08 devices use an enhanced 6805-derived core with a von Neumann memory map, stack pointer relative addressing, and a prescaled timer system suitable for PWM generation, periodic interrupts, and simple serial protocols implemented in software. This makes the family well suited to appliance control, small motor drives, and sensor interface tasks.
Typical applications include white-goods appliance controllers, automotive body electronics, industrial sensor nodes, and legacy board-level maintenance where the original MC908JK3 design must remain in production. Because the device is discontinued by the original manufacturer, Rochester Electronics supply is the primary path for ongoing production support.
Design consideration: when replacing a legacy HC08 MCU in an existing PCB, verify package code, flash size, and programming-tool compatibility (Cyclone Pro / HC08 programmmers) before committing to the footprint.
This page synthesizes distributor availability data, lifecycle status, and practical sourcing guidance not consolidated in the manufacturer datasheet.
Drop-in alternatives for MC908JK3EMDWE574 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC908JK3MDWE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC908JL3
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC908JK8
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC908JK3EMDWE574 Maximum Ratings & Electrical Characteristics
| Core Architecture | HC08 (8-bit) |
| Product Classification | MICROCONTROLLER, 8 BIT, HC08/S08 |
| Original Manufacturer | Freescale Semiconductor (legacy Motorola) |
| Current Supply Source | Rochester Electronics (authorized legacy source) |
| Lifecycle Status | End of Life (available via Rochester Electronics) |
MC908JK3EMDWE574 standard Pin Configuration Guide
Pin configuration for MC908JK3EMDWE574 (standard 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 MC908JK3EMDWE574.
Refer to the datasheet for full pin configuration.
Typical Applications
MC908JK3EMDWE574 is suitable for 6 applications: Appliance Control Boards, Legacy Industrial Sensor Nodes, Automotive Body Electronics (Legacy Service), Obsolete PCB Repair and Remanufacturing, Small Motor and Load Control, IoT Edge Node Front-End (Legacy Retrofit).
Appliance Control Boards
The MC908JK3EMDWE574 fits white-goods and small-appliance controller boards that were designed around the HC08 platform, where an 8-bit core, on-chip flash, and integrated timers handle button scanning, relay driving, and simple PWM loads. The HC08 timer system generates gate or heater PWM without external circuitry, and the on-chip flash allows field-updated firmware on an already-released PCB. Because this silicon is the exact original device, replacement boards behave identically to certified legacy units - important for safety-regulated appliance programs where requalification of a new MCU is costly. Maintain last-time-buy stock for remaining production.
Recommended
Legacy Industrial Sensor Nodes
In industrial environments, the MC908JK3EMDWE574 supports sensor acquisition nodes that digitize analog inputs with the on-chip resources of the HC08 platform and report over software-implemented serial links. Its low-power wait and stop modes suit battery or 24V-loop powered nodes that must idle between sampling events, and its 8-bit core is fully adequate for threshold comparison, filtering, and calibration math at low cost. Sustaining engineers choose the original Rochester-supplied part because the PCB footprint, firmware, and calibration data remain untouched, avoiding recertification of installed industrial equipment already deployed in the field.
Recommended
Automotive Body Electronics (Legacy Service)
HC08-family MCUs were widely used in automotive body modules such as mirror controls, seat adjusters, and lighting switches. The MC908JK3EMDWE574, in its extended-grade E option, addresses these harsher-environment legacy programs where original equipment manufacturers still repair or remanufacture modules. Using Rochester Electronics authorized supply keeps the silicon identical to the originally qualified device, which is a prerequisite for continued service of type-approved modules. Designers should confirm the exact temperature grade from the ordering code and the family datasheet, since distributor listings do not expose the grade parameter directly.
Recommended
Obsolete PCB Repair and Remanufacturing
Contract manufacturers and repair houses rely on the MC908JK3EMDWE574 to remanufacture discontinued HC08-based boards in industrial, medical, and consumer equipment. A genuine, Rochester Electronics-sourced MCU means the replacement device carries the original mask/flash configuration and programming characteristics, so existing programming fixtures such as MON08 or Cyclone Pro interfaces work unchanged. This avoids the risk of cloned or remarked parts that fail programming or timing verification. Where exact JK3 stock is exhausted, the same-family alternatives listed on this page offer a footprint-checked path, subject to datasheet confirmation of pinout.
Recommended
Small Motor and Load Control
The HC08 timer architecture of the MC908JK3EMDWE574 supports PWM generation for small DC motor drives, fan controllers, and heater or lamp load control. The 8-bit core executes duty-cycle updates and fault monitoring (over-current, stall detect via comparator or ADC input) in a straightforward interrupt-driven loop, keeping total system cost at the 8-bit floor. Designers sustaining these products value the deterministic single-cycle-modified Harvard-style HC08 instruction timing, which keeps control-loop latency predictable without the pipeline effects of higher-core-count devices. Verify PWM channel count against the family datasheet timer block for your firmware.
Recommended
IoT Edge Node Front-End (Legacy Retrofit)
When retrofitting connectivity onto legacy HC08-based products, the MC908JK3EMDWE574 continues to serve as the deterministic local controller while an external module provides wireless links. Its software SCI can bridge to a UART-based radio or bridge IC, letting engineers add IoT capability without replacing the validated 8-bit control code. Keeping the original MCU preserves real-time behavior of the legacy control loops while the added module handles networking. For new greenfield IoT nodes, however, select a current NXP MCU; this part is reserved for continuity of HC08-based installed equipment.
Recommended
Recommended Products Summary
Engineering reference data for MC908JK3EMDWE574 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC908JK3MDWE | MC908JL3 | MC908JK8 |
|---|---|---|---|---|
| Package | MDWE574 ordering code (package per Freescale ordering table) | Same MDW package family | Shared package options - verify footprint | Shared package options - verify footprint |
| Brand | NXP Semiconductors (Freescale legacy, via Rochester Electronics) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | HC08 8-bit | HC08 8-bit - identical | HC08 8-bit | HC08 8-bit |
| Lifecycle Status | EOL - Rochester Electronics supply | EOL - legacy supply | EOL - legacy supply | EOL - legacy supply |
| Pin-to-Pin Compatibility | Reference | Yes - same JK3 die/package | Verify per package option | Verify per package option |
Key Differentiators
- Authorized original silicon rather than clone/remarked parts (vs Grey-market MC908JK3 offers)
- Extended-grade E option for harsh environments (vs MC908JK3MDWE (standard grade))
- Zero-redesign continuity (vs MC908JL3 / modern S08 MCUs)
Design Notes
The MDWE574 suffix encodes package and grade options per the Freescale ordering-information table. Before purchasing or substituting, decode the full ordering code against the MC908JK3 family datasheet - ordering a different package code will not fit the existing PCB footprint. Because the part is EOL, also confirm whether Rochester Electronics has warehouse stock or will run a fabrication-to-order batch, since the latter typically carries a multi-week lead time and a minimum order quantity.
HC08-family devices typically operate from a single supply rail with internal voltage regulation of the flash pump. Verify the supply voltage range and decoupling requirements in the MC908JK3 datasheet before reuse - legacy 5V HC08 boards must not be powered at 3.3V without confirming the grade supports it. Keep a 0.1 uF ceramic capacitor directly at the VDD pin, matching the original board's layout, to preserve the same noise immunity as the validated legacy design.
For HC08 flash reprogramming in-circuit, the legacy MON08 interface requires specific pin access (IRQ, RST, and a monitor-mode entry resistor network). If your remanufactured board must be field-programmable, preserve the original MON08 header and resistor values from the legacy design. Failure to keep the monitor-mode entry circuit is the most common reason legacy HC08 boards become unprogrammable after a minor layout revision.
Compliance Information
No compliance data was returned in the verified web results for this legacy Rochester Electronics part. Compliance certificates must be requested from Rochester Electronics with the quotation.
