MC908JK3ECDWE - 8-bit HC08 MCU 4KB Flash SOIC-20 | NXP
N.º de pieza: MC908JK3ECDWE ⚠ Última compra| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $7.85 | $7,85 |
| 10 | $7.06 | $70,60 |
| 100 | $6.28 | $628,00 |
| 500 | $5.49 | $2.745,00 |
| 1.000 | $4.78 | $4.780,00 |
MC908JK3ECDWE Descripción general
A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory (Flash/ROM), working memory (RAM), and a mix of peripherals such as timers, communication controllers, and ADCs. The M68HC08 architecture succeeded the earlier M68HC05 as Freescale's (now NXP's) mainstream 8-bit core, improving on its predecessor with a wider instruction set, an indexable stack pointer, and richer addressing modes. Microcontrollers sit in the broader taxonomy of embedded processors -> microcontrollers -> 8-bit MCUs -> CISC MCUs.
Key differentiating features of the MC908JK3ECDWE include 4 KB of in-application re-programmable Flash for firmware storage, 128 B of RAM for volatile data, an on-chip multi-channel ADC for analog sensing, and an integrated clock generator that accepts an external crystal or ceramic resonator. The 20-pin SOIC package gives designers 15 to 17 usable general-purpose I/O pins depending on oscillator configuration, sufficient for keypad, sensor, and small-motor control interfaces. The device also includes a low-voltage inhibit (LVI) module and a computer-operating-properly (COP) watchdog for brown-out and code-lockup protection.
The HC08 JK/JL sub-family uses a two-stage instruction pipeline and supports both Flash and ROM program-memory variants. Production silicon runs in a mature CMOS process, which yields very low active current consumption (typically a few mA at full speed) and sub-microamp standby currents, enabling battery-backed or energy-harvested applications. Unlike 32-bit ARM Cortex-M parts, the HC08 executes instructions in 2 to 5 bus cycles without hardware division, trading raw performance for predictable deterministic interrupt latency and very small die area.
Typical applications for this MCU include appliance control boards, low-cost remote controls, sensor signal conditioning front ends, simple motor-driver sequencers, and battery-management monitor ICs in disposable products. Because the part is End-of-Life (EOL) per the NXP product discontinuance notice, new designs should plan for a verified drop-in replacement (see alternatives below) or migrate to the S08 or Kinetis E-series families for ongoing production.
When designing with this part, provide a clean 2.7 V to 3.3 V supply with adequate bulk decoupling (4.7 uF + 0.1 uF) near the VDD/VSS pins and a stable external resonator on OSC1/OSC2. In-system Flash programming requires the IRQ pin to be held in the proper state; consult the NXP datasheet for the exact monitor-mode entry sequence before committing to this MCU in new designs.
Alternativas directas para MC908JK3ECDWE — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MC908JK3ECDWE (mismo factor de forma y huella) — difiere en Package, Supply Voltage, Program Memory Size, RAM Size, Core Architecture.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MCR908JK3ECDWE
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Ver hoja de datos →MCR908JK3EMDWE
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MC68HRC908JK3CDW
✅ Sustitución directa✓ En stock
$4.1 / unidad
Ver hoja de datos →MC908JK1ECDWE
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$4.75 / unidad
Ver hoja de datos →MC908JK3EMDWE
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$6.5 / unidad
Ver hoja de datos →S9S08AW60E5MFGE
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$6.05 / unidad
Ver hoja de datos →MC908JK3ECDWE Valores máximos y características eléctricas
| Core Architecture | M68HC08 (8-bit CISC) |
| Sub-Family | HC908JK / HC908JL |
| Ancho del bus de datos | 8 bit |
| Frecuencia de reloj máxima | 8 MHz |
| Program Memory | 4 KB Flash (4K x 8) |
| RAM | 128 B (128 x 8) |
| On-Chip ADC | Yes (multi-channel) |
| Supply Voltage - Operating | 2.7 V to 3.3 V |
| Encapsulado | 20-pin SOIC (SO-20, 300 mil) |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -40 C to +85 C |
| Number of I/O Pins | Up to 17 GPIO |
| Watchdog / COP | Yes (COP watchdog timer) |
| Low-Voltage Inhibit (LVI) | Yes |
Configuración de pines de MC908JK3ECDWE
| Pin 1 | IRQ — External interrupt / RESET request (active low) |
| Pin 2 | PTA0 — Port A bit 0 / ADC channel 0 |
| Pin 3 | PTA1 — Port A bit 1 / ADC channel 1 |
| Pin 4 | VDD — Power supply (2.7 V - 3.3 V) |
| Pin 5 | VSS — Ground |
| Pin 6 | OSC1 — Crystal / ceramic resonator input |
| Pin 7 | OSC2 — Crystal / ceramic resonator output |
| Pin 8 | PTC0 — Port C bit 0 / timer channel |
| Pin 9 | PTC1 — Port C bit 1 / timer channel |
| Pin 10 | PTC2 — Port C bit 2 / timer channel |
| Pin 11 | PTC3 — Port C bit 3 / timer channel |
| Pin 12 | PTC4 — Port C bit 4 / timer channel |
| Pin 13 | PTC5 — Port C bit 5 / timer channel |
| Pin 14 | PTC6 — Port C bit 6 / timer channel |
| Pin 15 | PTC7 — Port C bit 7 / timer channel |
| Pin 16 | PTB0 — Port B bit 0 / ADC channel |
| Pin 17 | PTB1 — Port B bit 1 / ADC channel |
| Pin 18 | PTB2 — Port B bit 2 / ADC channel |
| Pin 19 | PTB3 — Port B bit 3 / ADC channel |
| Pin 20 | RST — Reset input (active low) / test mode entry |
Aplicaciones típicas
MC908JK3ECDWE es adecuado para 7 aplicacións: Consumer Appliance Control Boards, Battery-Powered Sensor Hubs, Remote Control / IR Transmitter MCU, Industrial Sensor Signal Conditioning, Automotive Body Electronics (Auxiliary), Small Motor / Fan Speed Controllers, Smart Home Edge Nodes.
Consumer Appliance Control Boards
The MC908JK3ECDWE's 4 KB Flash, 128 B RAM, on-chip ADC, and 17 GPIO pins make it a strong fit for low-cost appliance control boards where deterministic 8-bit performance is sufficient. Its 2.7-3.3 V supply matches single Li-ion or 3.3 V regulator rails common in white goods. The COP watchdog and LVI module protect against firmware lockup during brown-out events typical in motor-driven appliances, and the SOIC-20 package survives standard wave-solder or hand-rework processes for low-volume runs.
Recomendado
Battery-Powered Sensor Hubs
The HC08 JK core's low active current and sub-microamp standby make the MC908JK3ECDWE well suited to battery-powered sensor hubs that wake briefly to measure, then sleep. The 8-channel-capable on-chip ADC reads temperature, voltage, and resistive sensors directly without external converters. Operating voltage 2.7-3.3 V matches two alkaline or a single Li-ion cell, and the integrated LVI prevents firmware corruption when cells deplete. The 17 GPIO lines are sufficient for I2C/SPI sensor buses plus LED status indicators.
Recomendado
Remote Control / IR Transmitter MCU
The MC908JK3ECDWE suits low-cost IR remote controls thanks to its 8 MHz core (enough for 38 kHz carrier modulation), 4 KB program space (fits RC5/RC6/SIRC firmware tables), and abundant GPIO for keypad matrix scanning. Its wide operating temperature range (-40 C to +85 C) handles storage and use in vehicles and outdoor environments. The COP watchdog prevents lockup on weak batteries, and the SOIC-20 package is friendly to small hand-held plastic enclosures.
Recomendado
Industrial Sensor Signal Conditioning
For industrial sensor signal conditioning front ends, the MC908JK3ECDWE's on-chip ADC performs digital filtering and linearization on transducer outputs, replacing more expensive standalone signal conditioners. Its HC08 CISC core executes deterministic bit-banging for proprietary sensor protocols, while the 4 KB Flash supports factory calibration tables. The watchdog and LVI modules enable reliable operation in electrically noisy factory floors, and the SOIC-20 footprint simplifies hand-prototyping before moving to larger production runs.
Recomendado
Automotive Body Electronics (Auxiliary)
Although not AEC-Q100 qualified, the MC908JK3ECDWE has been deployed in non-safety automotive body electronics such as interior lighting controllers and accessory timers where its 8-bit HC08 performance is sufficient. Its wide operating temperature (-40 C to +85 C) covers cabin environments. Note that AEC-Q100 designs should instead use the MC9S08AW60E5MFGE or KEAZ automotive-grade families; the MC908JK3ECDWE is appropriate only for non-safety auxiliary body functions in legacy programs.
Recomendado
Small Motor / Fan Speed Controllers
The MC908JK3ECDWE drives small motor or fan speed controllers using its on-chip timers for PWM generation and its ADC for closed-loop RPM feedback. The 17 GPIO pins handle direction, brake, tachometer input, and fault lines. The 4 KB Flash stores custom acceleration/deceleration profiles, and the HC08 deterministic interrupt latency ensures clean PWM edges without jitter. The 20-SOIC package's modest thermal footprint suits low-power BLDC or DC-brush fan drivers up to a few hundred mA.
Recomendado
Smart Home Edge Nodes
For smart-home edge nodes that simply read a sensor and toggle a relay, the MC908JK3ECDWE provides 8-bit economy with enough Flash to fit ZigBee/Z-Wave co-processor glue logic, debouncing, and basic encryption. Its 3.3 V operation aligns with common smart-home wireless module supply rails. Designers considering new smart-home designs should plan to migrate to S08 or Kinetis E-series for ongoing supply, since the JK3E family is now in last-time-buy status.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC908JK3ECDWE — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MCR908JK3ECDWE | MCR908JK3EMDWE | MC68HRC908JK3CDW |
|---|---|---|---|---|
| Package | 20-SOIC (300 mil) | 20-SOIC (300 mil) - same | 20-SOIC (300 mil) - same | 20-SOIC - same |
| Brand | NXP Semiconductors | Rochester Electronics | Rochester Electronics | NXP Semiconductors |
| Core | M68HC08 8-bit | M68HC08 8-bit | M68HC08 8-bit | M68HC08 8-bit (HRC low-power variant) |
| Program Memory | 4 KB Flash | 4 KB Flash | 4 KB Flash | 4 KB ROM |
| RAM | 128 B | 128 B | 128 B | 128 B |
| Max Clock | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Supply Voltage | 2.7 V to 3.3 V | 2.7 V to 3.3 V | 2.7 V to 3.3 V | 2.7 V to 3.3 V |
| Lifecycle Status | EOL / Last Time Buy | Active (Rochester authorized re-creation) | Active (Rochester authorized re-creation) | EOL |
| On-Chip ADC | Yes | Yes | Yes | Yes |
Diferenciadores clave
- Authorized long-term supply path post-EOL (frente a MC908JK3ECDWE (NXP original))
- 8-bit economy in 20-SOIC (frente a MC908GZ60CFAE (HC08 GZ60, 64-LQFP))
- On-chip ADC eliminates external converters (frente a MC908JK1ECDWE (smaller Flash variant))
Notas de diseño
Bulk-decouple VDD/VSS with a 4.7 uF tantalum or ceramic plus a 0.1 uF ceramic placed within 5 mm of the IC pins. The HC08 JK core has strict 2.7-3.3 V supply bounds; operation below 2.7 V triggers the LVI module and forces a reset. For battery-backed designs, add a 10 kohm pull-up on the RST line and a Schottky diode to protect against reverse polarity, which is a common failure in battery appliances.
Route the crystal traces between OSC1 and OSC2 symmetrically with short, parallel traces and a ground guard ring to avoid stray capacitance shifts. Keep digital switching traces (PWM, communication) at least 3 mm away from the oscillator traces to prevent injection of harmonics. Place the IC so that the SOIC-20 pads are aligned with 0.65 mm pitch (300 mil body), with via stitching along the ground pour to reduce ground bounce on GPIO transitions.
Do not assume 5 V tolerance on any GPIO pin: the HC08 JK I/O pins are absolute-maximum 3.6 V, and over-voltage will permanently damage the device. Use a level translator (e.g. resistive divider or dedicated translator) when interfacing with 5 V peripherals. The COP watchdog must be cleared in firmware within the configured timeout or it will reset the MCU, so always instrument the watch-dog service routine and avoid interrupts that could block it for longer than the COP timeout.
Información de cumplimiento
RoHS, lead-free, halogen-free, REACH, and conflict-mineral status were not explicitly confirmed in the verified web snippets. The 'E' suffix in the MPN traditionally denotes lead-free finish on NXP/Freescale parts, but official RoHS certificates should be requested from NXP or Rochester Electronics for compliance-critical orders. Part is not AEC-Q100 qualified - use MC9S08AW60E5MFGE or KEAZ family for automotive.
