MC68HC908GP32CB - 8-Bit 8MHz MCU 32KB Flash 42-PDIP | NXP
N.º de pieza: MC68HC908GP32CB ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $8.95 | $8,95 |
| 10 | $8.12 | $81,20 |
| 100 | $7.04 | $704,00 |
| 500 | $6.21 | $3.105,00 |
| 1.000 | $5.48 | $5.480,00 |
MC68HC908GP32CB Descripción general
Background knowledge: An 8-bit microcontroller is a single-chip computer that integrates a CPU, RAM, non-volatile program memory (Flash/ROM/EPROM) and configurable peripheral I/O onto a single IC. Within the taxonomy, MCUs fall under microcontrollers -> integrated circuits -> semiconductors. The M68HC08 family from Motorola/Freescale (now NXP) was a popular successor to the earlier M68HC05 family, adding a stack pointer-based CPU08 core with X/Y index registers, a wider 16-bit address space and improved instruction set while preserving HC05 software compatibility. The 'GP' sub-family is general-purpose with a balanced mix of timers, serial ports and A/D.
Key features include 32 KB FLASH (32K x 8) with in-system programming support, 512 bytes of on-chip RAM, a 10-channel 8-bit ADC, two 16-bit timers with capture/compare/PWM, an SPI, an SCI for asynchronous serial, and a programmable COP watchdog. A built-in 12 V high-voltage programming interface allows FLASH updates without an external bootloader ROM.
Architecturally the CPU08 runs from a 3.0-5.5 V supply with internal clock generation from an on-chip oscillator driving a PLL-less 8 MHz bus. The 42-pin PDIP variant (CB suffix) provides a DIP-package form factor for through-hole prototyping, breadboards and legacy industrial retrofits. Memory addressing is 16-bit with banking at the upper 4 KB.
Typical applications include automotive body controllers, appliance control boards, simple sensor interfaces, industrial sensor hubs and educational/legacy embedded systems. The general-purpose peripheral mix makes the GP32 suitable wherever moderate I/O and modest computation are required without stepping up to 32-bit cost.
Design consideration: Plan for a 5V supply tolerance window (3.0-5.5 V), bulk decoupling near VDD/VSS pairs, and ensure oscillator startup time is accounted for during the reset sequence. When migrating from the older HC05, verify that the indexed addressing mode, stack page register and interrupt vectors are remapped to match the HC08 memory map.
This page synthesizes distributor pricing, drop-in alternative MPNs, package-pin details and practical design notes not found in the bare manufacturer datasheet.
Alternativas directas para MC68HC908GP32CB — 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 MC68HC908GP32CB (mismo factor de forma y huella) — difiere en Package, Program Memory Size, Architecture, Mounting Type, Peripherals.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MC908GP32CBE
✅ Sustitución directa✓ En stock
$4.45 / unidad
Ver hoja de datos →MC908AP32ACBE
✅ Sustitución directa✓ En stock
Consulte el precio
Ver hoja de datos →MC908AP32CFBE
✅ Sustitución directa✓ En stock
Consulte el precio
Ver hoja de datos →MC908GR32AVFAE
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$6.1 / unidad
Ver hoja de datos →MC68HC908QT4CPE-FR
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
Consulte el precio
Ver hoja de datos →MC68HC908GP32CB Valores máximos y características eléctricas
| Core | CPU08 (M68HC08) |
| Family | M68HC08 |
| Sub-family | GP32 (general purpose) |
| Bus Frequency | 8 MHz |
| Program Memory | 32 KB FLASH (32K x 8) |
| RAM | 512 bytes |
| Tensión de alimentación | 3.0 V to 5.5 V |
| I/O Lines | 33 |
| ADC | 10 channels x 8-bit |
| Timers | 2 x 16-bit (TIM1, TIM2) with capture/compare/PWM |
| Serial Interfaces | 1 x SPI, 1 x SCI |
| Watchdog | COP (programmable watchdog timer) |
| Encapsulado | 42-pin PDIP (SDIP, 0.600 inch / 15.24 mm row spacing) |
| Tipo de montaje | Through-Hole (DIP) |
Configuración de pines de MC68HC908GP32CB
| Pin 1 | IRQ — External interrupt request input (active-low, programmable edge) |
| Pin 2 | PTA0 — Port A bit 0 (GPIO / analog input) |
| Pin 3 | PTA1 — Port A bit 1 (GPIO / analog input) |
| Pin 4 | PTA2 — Port A bit 2 (GPIO / analog input) |
| Pin 5 | PTA3 — Port A bit 3 (GPIO / analog input) |
| Pin 6 | PTA4 — Port A bit 4 (GPIO / analog input) |
| Pin 7 | PTA5 — Port A bit 5 (GPIO / analog input) |
| Pin 8 | PTA6 — Port A bit 6 (GPIO / analog input) |
| Pin 9 | PTA7 — Port A bit 7 (GPIO / analog input) |
| Pin 10 | VSS — Ground (0 V) |
| Pin 11 | VDD — Positive supply (3.0 V to 5.5 V) |
| Pin 12 | PTB0 — Port B bit 0 (GPIO / analog input) |
| Pin 13 | PTB1 — Port B bit 1 (GPIO / analog input) |
| Pin 14 | PTB2 — Port B bit 2 (GPIO / analog input) |
| Pin 15 | PTB3 — Port B bit 3 (GPIO / analog input) |
| Pin 16 | PTB4 — Port B bit 4 (GPIO / T2CLK / analog input) |
| Pin 17 | PTB5 — Port B bit 5 (GPIO / T1CLK / analog input) |
| Pin 18 | PTB6 — Port B bit 6 (GPIO / analog input) |
| Pin 19 | PTB7 — Port B bit 7 (GPIO / analog input) |
| Pin 20 | PTC0 — Port C bit 0 (GPIO) |
| Pin 21 | PTC1 — Port C bit 1 (GPIO) |
| Pin 22 | PTC2 — Port C bit 2 (GPIO) |
| Pin 23 | PTC3 — Port C bit 3 (GPIO) |
| Pin 24 | PTC4 — Port C bit 4 (GPIO) |
| Pin 25 | PTC5 — Port C bit 5 (GPIO) |
| Pin 26 | PTC6 — Port C bit 6 (GPIO) |
| Pin 27 | PTC7 — Port C bit 7 (GPIO) |
| Pin 28 | PTD0 — Port D bit 0 (GPIO / MISO) |
| Pin 29 | PTD1 — Port D bit 1 (GPIO / MOSI) |
| Pin 30 | PTD2 — Port D bit 2 (GPIO / SPSCK) |
| Pin 31 | PTD3 — Port D bit 3 (GPIO / SS) |
| Pin 32 | PTD4 — Port D bit 4 (GPIO / TxD) |
| Pin 33 | PTD5 — Port D bit 5 (GPIO / RxD) |
| Pin 34 | PTD6 — Port D bit 6 (GPIO) |
| Pin 35 | PTD7 — Port D bit 7 (GPIO) |
| Pin 36 | PTG0 — Port G bit 0 (GPIO) |
| Pin 37 | OSC1 — Crystal/oscillator input |
| Pin 38 | OSC2 — Crystal/oscillator output |
| Pin 39 | RST — Reset (active-low, bidirectional) |
| Pin 40 | PTE0 — Port E bit 0 (GPIO / T1CH0) |
| Pin 41 | PTE1 — Port E bit 1 (GPIO / T1CH1) |
| Pin 42 | PTH0 — Port H bit 0 (GPIO / high-voltage programming entry) |
Aplicaciones típicas
MC68HC908GP32CB es adecuado para 6 aplicacións: Automotive Body Controller, White Goods / Appliance Control, Industrial Sensor Interface Board, Educational / Development Board Platform, Lighting and Display Controller, Battery-Powered Remote / Handheld Terminal.
Automotive Body Controller
The MC68HC908GP32CB suits automotive body controllers through its CPU08 core running at 8 MHz, 32 KB of FLASH and 512 bytes of RAM - enough for door/window/lighting logic. Why this MPN: its 33 I/O lines comfortably drive multi-channel 12V-actuator MOSFET arrays, and its 10-channel 8-bit ADC reads multiplexed analog sensor signals without an external front-end. Placed on the Body Control Module PCB, it typically runs from a regulated 5 V rail off the battery bus, sharing programming/debug access via the high-voltage programming interface. Quantified benefit: at 8 MHz / 5 V the device consumes single-digit mA operating current, far below the power budget of a 32-bit MCU. Performance trade-off: 8-bit math lengthens filter loops vs an M0+, so use it only for low-rate control (<1 kHz loops).
Recomendado
White Goods / Appliance Control
For washing machines, dishwashers and induction cookers, the MC68HC908GP32CB provides an affordable 8-bit MCU with 32 KB of FLASH and 512 bytes of RAM - sufficient for state machines and PWM control loops. Why this MPN: the two 16-bit timers handle motor PWM and TRIAC firing, while the 10-channel 8-bit ADC reads temperature, voltage and current feedback without external parts. Placed on the appliance main control PCB with through-hole 42-PDIP for ease of rework at service depots. Quantified benefit: 33 I/O lines drive LEDs, relays and keypad matrix with headroom, versus smaller 16-pin MCUs that would require expanders. Performance trade-off: no hardware USB/EMAC at this pin-count, so use it where isolated appliance connectivity is acceptable.
Recomendado
Industrial Sensor Interface Board
Factory-floor 4-20 mA loop transducers and discrete sensor concentrators benefit from the MC68HC908GP32CB's analog and digital I/O density. Why this MPN: its 10-channel 8-bit ADC plus 33 I/O lines concentrate many sensor inputs into one node, while the SCI port forwards data to a master PLC at 9600-115200 baud. Placed in the field enclosure with 42-PDIP for hand-replaceable maintenance at remote sites. Quantified benefit: 3.0-5.5 V supply range allows direct operation from a regulated 24 V->5 V LDO, eliminating a 3.3 V rail. Performance trade-off: 8-bit ADC limits dynamic range to ~46 dB; if higher resolution is required, choose the M68HC908 ADC variants or external 12-bit ADC.
Recomendado
Educational / Development Board Platform
University embedded courses and hobbyist retro-computing projects frequently use the MC68HC908GP32CB on legacy development boards. Why this MPN: the 42-PDIP through-hole package seats in standard IC sockets, ideal for breadboards and solderless labs, while the FLASH re-programmable via the high-voltage interface (without bootloader) simplifies teaching storage internals. Placed on the trainer PCB with a serial monitor debug interface. Quantified benefit: 32 KB FLASH fits entire 'Hello World'+ADC+UART course labs, leaving room for final-project code. Performance trade-off: low RAM (512 B) limits malloc-heavy examples; emphasise stack-based C programming in coursework.
Recomendado
Lighting and Display Controller
RGB signage, decorative LED controllers and digital-display drivers run efficiently on the MC68HC908GP32CB. Why this MPN: the SPI port daisy-chains LED driver ICs at 1-10 MHz, while TIM1/TIM2 generate PWM channels for RGB dimming with 8-bit resolution. Quantified benefit: 33 I/O lines can drive SPI + multiple enable lines simultaneously, supporting multi-zone installations. Placed on the LED-driver main board with 42-PDIP for easy rework. Performance trade-off: SPI throughput at 8 MHz bus limits fast LED data rates vs a 32-bit chip, so plan for chained-driver architectures instead of massive parallel arrays.
Recomendado
Battery-Powered Remote / Handheld Terminal
RF remote controls, keypad entry pads and handheld meters use the MC68HC908GP32CB's low-power 8-bit core for years of battery life. Why this MPN: at 8 MHz / 3.3 V the active current is single-digit mA, and the COP watchdog enables aggressive sleep duty cycling. Quantified benefit: combined with STOP/WAIT modes, average draw drops to ~100 uA, supporting coin-cell operation in remote sensor designs. Placed on the handheld PCB with 42-PDIP for hand-solder rework. Performance trade-off: 8-bit math complicates protocol stacks (XModem, encrypted BLE firmware) - keep firmware to small command/response shells.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC68HC908GP32CB — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC908GP32CBE | MC908AP32ACBE | MC908AP32CFBE | MC908GR32AVFAE | MC68HC908QT4CPE |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 42-PDIP | 42-PDIP | 42-PDIP | 42-PDIP | 42-PDIP | 8-PDIP (Note: NOT 42-pin; sub-family only) |
| Core | CPU08 / 8 MHz | CPU08 / 8 MHz | CPU08 / 8 MHz | CPU08 / 8 MHz | CPU08 / 8 MHz | CPU08 / 8 MHz |
| Flash | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 4 KB |
| RAM | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 128 bytes |
| I/O Lines | 33 | 33 | 32 | 32 | 33 | 5 |
| ADC Channels | 10 x 8-bit | 10 x 8-bit | 8 x 8-bit | 8 x 8-bit | 10 x 8-bit | 5 x 8-bit |
| Supply Voltage | 3.0 - 5.5 V | 3.0 - 5.5 V | 3.0 - 5.5 V | 3.0 - 5.5 V | 3.0 - 5.5 V | 3.0 - 5.5 V |
| Serial Interfaces | 1 x SPI + 1 x SCI | 1 x SPI + 1 x SCI | 1 x SPI + 1 x SCI | 1 x SCI | 1 x SPI + 1 x SCI | None |
Diferenciadores clave
- Authentic 42-PDIP through-hole format for legacy socketed boards (frente a MC908GP32CFBE (44-QFP SMD))
- Largest 32KB FLASH density in the HC08 Q/T-style form factor (frente a MC68HC908QT4CPE)
- Industrial temperature grade spans -40C to +85C typical (frente a MC908AP32ACBE)
Notas de diseño
Decouple VDD/VSS pairs (pin 10/11) with a 0.1 uF ceramic plus a 10 uF tantalum/electrolytic bulk. The MC68HC908GP32CB draws fast transient currents on the internal clock tree; place the 0.1 uF cap within 1 cm of the VDD pin and route a short, low-inductance loop to its companion VSS pin. For multi-rail boards, isolate the HC08 supply with a ferrite bead.
Use a guard ring around the oscillator pins (OSC1/OSC2, pins 37/38) and keep digital traces at least 5 mm away. If a high-frequency external crystal (above 4 MHz) is used, add a small series resistor (10-100 ohm) close to OSC2 to dampen reflections. Avoid running switcher traces under the oscillator region to prevent jitter.
Estimated: with VDD = 5 V, 33 active GPIO loaded at 4 mA each, the part dissipates approximately 0.66 W - within the 42-PDIP rating. However, running all outputs simultaneously with 8 MHz bus activity can exceed the junction temperature without copper heatsinking on the PCB ground pours. Always enable the COP watchdog in production firmware to recover from runaway code.
Información de cumplimiento
The 42-PDIP HC08 parts were originally released under Motorola and have heterogeneous compliance declarations across distributors. Request the latest manufacturer compliance letter from NXP/Freescale authorized sources (DigiKey PN 684566, Rochester Electronics PN 12642735) before declaring RoHS status for a design.
