MC908JK3EMDWE - 8-bit HC08 MCU, 4KB Flash, 20-SOIC | NXP
N.º de pieza: MC908JK3EMDWE ⚠ Última compra| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $13.2368 | $13,24 |
| 10 | $11.91 | $119,10 |
| 100 | $9.85 | $985,00 |
| 500 | $7.95 | $3.975,00 |
| 1.000 | $6.5 | $6.500,00 |
MC908JK3EMDWE Descripción general
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, and peripheral blocks such as timers, ADCs, and communication controllers. The HC08 is NXP's classic 8-bit CISC architecture, optimized for deterministic behaviour, low power, and easy C/assembly programming in resource-constrained products. Within the wider hierarchy, the MC908JK3 sits under: MCU -> 8-bit MCU -> HC08 family -> CISC microcontroller -> semiconductor. It is one of the lowest-pin-count HC08 derivatives, replacing earlier HC05 and HC11 designs in cost-sensitive nodes.
Key differentiating features of the MC908JK3EMDWE include its 15 GPIO pins (versus the 6 or 7 pins on smaller JK-series members), a dedicated 12-channel 10-bit ADC that simplifies sensor interfaces, and a 20-pin wide SOIC package that is hand-solderable and easy to prototype. The 4KB Flash and 128B RAM are sufficient for state machines, simple control loops, and modest protocol stacks. The device supports both 3.3V and 5V operation across an industrial -40C to +125C temperature range, suiting it to automotive under-hood and industrial sensor nodes.
The MC908JK3EMDWE architecture uses a CISC instruction set with a Von Neumann memory map, meaning code and data share the same bus. The 8 MHz internal bus rate provides ~1 MIPS throughput per MHz, which is adequate for asynchronous serial (SCI/SPI) bit-banging and modest control loops. An on-chip clock generator accepts an external crystal or resonator; no PLL is integrated. The 10-bit ADC uses a successive-approximation register with configurable sample time, while the TIM block supports input capture, output compare, and PWM with selectable prescalers.
Typical applications include automotive relay drivers, HVAC blower controls, seat and mirror actuators, simple sensor transmitters, and small appliance motor controllers. Its industrial -40C to +125C rating makes it suitable for outdoor equipment and white-goods environments where commercial-grade parts would fail. The wide SOIC package simplifies hand rework and rework-friendly thermal profiles for low-volume manufacturing.
When designing with the MC908JK3EMDWE, ensure the supply is well-decoupled with a 100nF ceramic capacitor close to VDD/VSS, and that unused ADC channels are tied to a defined voltage (not floating) to avoid injection current. A reset supervisor or external pull-up on the RESET pin is recommended for automotive noise immunity. Programming is done via the standard HC08 Background Debug Mode (BDM) interface, requiring a single-pin bidirectional debug connection.
This page synthesises verified NXP and distributor specifications, EOL cross-references, and practical design notes not found in the bare datasheet.
Alternativas directas para MC908JK3EMDWE — 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 MC908JK3EMDWE (mismo factor de forma y huella) — difiere en Package, Mounting Type, Number of I/O Pins, Core Architecture, Operating Temperature.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MC908JK3EMDWER
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MC908JK3ECDWE
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$4.78 / unidad
Ver hoja de datos →MC908JK3ECDWER
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MCR908JK3ECDWE
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Ver hoja de datos →MC908JK1EMDWE
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MC908JK3EMDWE Valores máximos y características eléctricas
| Product Type | 8-bit Microcontroller (MCU) |
| Core Architecture | HC08 (CISC, 8-bit) |
| Program Memory (Flash) | 4 KB (4K x 8) |
| RAM Size | 128 B (128 x 8) |
| Maximum Bus Frequency | 8 MHz |
| Number of I/O Pins | 15 |
| ADC | 12-channel, 10-bit SAR |
| Timer Module | TIM (capture/compare/PWM) |
| Tensión de alimentación | 3.3 V / 5 V (dual range) |
| Temperatura de funcionamiento | -40 C to +125 C |
| Encapsulado | 20-pin SOIC (0.295 in / 7.50 mm width), Tube |
| Tipo de montaje | Surface Mount |
| Nivel MSL | 1 (unlimited floor life at <=30 C / 85% RH) |
| Debug Interface | Background Debug Mode (BDM) |
Configuración de pines de MC908JK3EMDWE
| Pin 1 | RESET — Active-low reset input with internal pull-up |
| Pin 2 | PTA0/KBD0 — Port A bit 0 / Keyboard wakeup |
| Pin 3 | PTA1/KBD1 — Port A bit 1 / Keyboard wakeup |
| Pin 4 | PTA2/KBD2 — Port A bit 2 / Keyboard wakeup |
| Pin 5 | PTA3/KBD3 — Port A bit 3 / Keyboard wakeup |
| Pin 6 | PTA4/ADP0 — Port A bit 4 / ADC channel 0 |
| Pin 7 | PTA5/ADP1 — Port A bit 5 / ADC channel 1 |
| Pin 8 | PTA6/ADP2 — Port A bit 6 / ADC channel 2 |
| Pin 9 | PTA7/ADP3 — Port A bit 7 / ADC channel 3 |
| Pin 10 | PTB0/ADP4 — Port B bit 0 / ADC channel 4 |
| Pin 11 | PTB1/ADP5 — Port B bit 1 / ADC channel 5 |
| Pin 12 | PTB2/ADP6 — Port B bit 2 / ADC channel 6 |
| Pin 13 | PTB3/ADP7 — Port B bit 3 / ADC channel 7 |
| Pin 14 | PTB4/ADP8 — Port B bit 4 / ADC channel 8 |
| Pin 15 | PTB5/ADP9 — Port B bit 5 / ADC channel 9 |
| Pin 16 | PTB6/ADP10 — Port B bit 6 / ADC channel 10 |
| Pin 17 | BKGD/MS — Background Debug Mode / Mode Select |
| Pin 18 | EXTAL — External clock / crystal oscillator input |
| Pin 19 | XTAL — Crystal oscillator output |
| Pin 20 | VDD — Positive supply (3.3V or 5V) |
Aplicaciones típicas
MC908JK3EMDWE es adecuado para 6 aplicacións: Automotive Relay & Solenoid Driver, HVAC Blower & Fan Speed Controller, Industrial Sensor Transmitter (4-20 mA Loop), Small Appliance Motor Control (White Goods), Automotive Seat & Mirror Actuator Controller, Simple Protocol Bridge / Bit-Banged UART Node.
Automotive Relay & Solenoid Driver
The MC908JK3EMDWE is well-suited for automotive relay, solenoid, and small motor-driver control modules where deterministic 8-bit performance, 12 ADC channels, and 15 GPIO pins are sufficient. Its -40C to +125C operating range covers under-hood thermal envelopes, and the 20-pin wide SOIC is hand-solderable for low-volume aftermarket parts. The on-chip TIM module generates PWM for FET coil drive at 1 kHz to 25 kHz without CPU intervention. Per NXP application notes, the ADC's 10-bit resolution is adequate for current-sense feedback in relay driver stages.
Recomendado
HVAC Blower & Fan Speed Controller
In residential and commercial HVAC blower controllers, the MC908JK3EMDWE handles closed-loop fan-speed regulation using its 10-bit ADC to digitise tachometer feedback and the TIM block to output a variable-duty PWM to the gate driver. The 8 MHz bus gives 8 MIPS headroom for control-law execution, while 128 B RAM stores the PID state. The 20-pin wide SOIC simplifies through-hole-friendly PCB designs in white-goods. NXP HC08 reference designs demonstrate 1 kHz to 25 kHz PWM resolution using the TIM module.
Recomendado
Industrial Sensor Transmitter (4-20 mA Loop)
The MC908JK3EMDWE forms the heart of a 4-20 mA current-loop sensor transmitter, sampling up to 12 sensor channels via its 10-bit SAR ADC and converting the result to a current-set DAC-driven loop. With 4 KB Flash it holds calibration coefficients, linearisation tables, and HART or proprietary protocol stacks. Its 3.3V/5V dual supply matches standard loop-powered transmitter rails, and 128 B RAM is ample for floating-point conversion state. Industrial -40C to +125C rating suits outdoor field installations.
Recomendado
Small Appliance Motor Control (White Goods)
Washing-machine drain pumps, dishwasher circulation pumps, and refrigerator compressor auxiliary controls benefit from the MC908JK3EMDWE's blend of 15 GPIO, hardware PWM, and 4 KB Flash. The HC08 CISC core executes simple state machines efficiently, while the wide-SOIC package is robust against the thermal cycling of white-goods environments. The 10-bit ADC digitises motor current and temperature sensors for soft-start algorithms. Per NXP design guides, the BDM debug port enables in-circuit firmware updates during appliance field service.
Recomendado
Automotive Seat & Mirror Actuator Controller
Seat-position memory controllers and mirror-fold actuators use the MC908JK3EMDWE for multi-channel DC motor drive via H-bridge FETs, with the TIM block generating complementary PWM and the ADC reading position-feedback potentiometers. The 12 ADC channels handle multiple motor axes without external muxing, and 15 GPIOs drive direction and enable lines. Automotive -40C to +125C rating matches cabin and door-module thermal requirements. NXP's HC08 family reference manual describes position-control loops using capture/compare.
Recomendado
Simple Protocol Bridge / Bit-Banged UART Node
For cost-sensitive protocol bridges - e.g., UART-to-I2C, SPI-to-UART, or LIN bus nodes - the MC908JK3EMDWE delivers enough MIPS at 8 MHz to bit-bang serial protocols in software while storing bridge configuration in 4 KB Flash. The 128 B RAM holds TX/RX ring buffers, and 15 GPIOs map to bridge signals. The BDM debug port allows field firmware updates without external programmer. NXP application note AN2310 demonstrates LIN slave implementation on the HC08 JK family.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC908JK3EMDWE — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC908JK3EMDWER | MC908JK3ECDWE | MC908JK3ECDWER | MCR908JK3ECDWE | MC908JK1EMDWE |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 20-SOIC (wide, 7.50 mm) | 20-SOIC (wide, 7.50 mm) - same | 20-SOIC (wide, 7.50 mm) - same | 20-SOIC (wide, 7.50 mm) - same | 20-SOIC (wide, 7.50 mm) - same | 20-SOIC (wide, 7.50 mm) - same |
| Program Memory | 4 KB Flash | 4 KB Flash | 4 KB ROM | 4 KB ROM | 4 KB ROM | 1 KB Flash |
| RAM Size | 128 B | 128 B | 128 B | 128 B | 128 B | 128 B |
| Max Bus Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| GPIO Count | 15 | 15 | 15 | 15 | 15 | 15 |
| Supply Voltage | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| Packaging Format | Tube | Tape & Reel | Tube | Tape & Reel | Tube | Tube |
Diferenciadores clave
- Flash-based reprogrammability vs ROM variants (frente a MC908JK3ECDWE)
- 4 KB Flash memory vs 1 KB Flash in JK1 series (frente a MC908JK1EMDWE)
- Same-family pin-compatible drop-in (T&R packaging) (frente a MC908JK3EMDWER)
Notas de diseño
Decouple VDD (pin 20) with a 100 nF X7R ceramic capacitor placed within 5 mm of the pin, plus a bulk 10 uF tantalum or electrolytic on the same supply rail. For 5 V operation, ensure the regulator provides clean transient response during PWM load steps. For 3.3 V operation, verify the regulator can source 25 mA peak (HC08 core + ADC + I/O transitions). Add a 10 kohm pull-up on RESET (pin 1) for automotive noise immunity.
Route the analog ADC inputs (PTA4-PTA7, PTB0-PTB6) away from PWM outputs and high-current traces. Use a ground pour on the top layer stitched with multiple vias to the bottom ground plane. Keep the crystal traces (EXTAL/XTAL, pins 18-19) short and surrounded by ground guard rings. The 20-pin wide SOIC requires 7.5 mm body width - reserve this much horizontal space on the PCB.
Do not leave unused ADC channels floating - tie them to a defined voltage (VDD or VSS) via 10 kohm resistors to prevent injection current and ADC accuracy drift. When migrating from the EM (Flash) to the EC (ROM) variant, verify that no in-application programming is required, as mask-ROM parts cannot be field-updated. Ensure the BKGD/MS pin (pin 17) has a defined state at reset (typically pulled high) for normal operation.
The HC08 core's 8 MHz bus generates harmonics up to 100 MHz - keep clock traces short and avoid routing them near analog ADC inputs. For long PCB traces on PTA/PTB GPIO lines, add 33 ohm series-termination resistors at the driver end to dampen ringing on fast edges. The TIM module's PWM output can produce up to 8 MHz toggling; verify your FET driver can sink the resulting current spikes without glitching the HC08 supply rail.
Información de cumplimiento
RoHS, REACH, lead-free, halogen-free and conflict-minerals status not provided in the verified web data for this part. AEC-Q100 qualification is not explicitly documented in the verified sources. Designers should request the latest NXP material declaration directly from NXP before committing to automotive or regulated designs.
