MC908BD48IBE - 8-Bit HC08 MCU 48KB Flash 42-PDIP | NXP
N.º de pieza: MC908BD48IBE ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $14.5 | $14,50 |
| 10 | $12.9 | $129,00 |
| 100 | $11.2 | $1.120,00 |
| 500 | $9.8 | $4.900,00 |
| 1.000 | $8.6 | $8.600,00 |
MC908BD48IBE Descripción general
An HC08 microcontroller (M68HC08) is a CISC 8-bit core architecture originally developed by Motorola and continued by NXP/Freescale. It sits in the hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> CISC -> HC08 family. The HC08BD sub-family adds on-chip Flash, a buffered EEPROM emulation area and timer/PWM modules optimised for body-control and appliance front-panel control. Compared with modern ARM Cortex-M parts, the HC08 trades raw performance for deterministic interrupt latency and a very small instruction footprint.
Key features include 48KB Flash program memory (47KB user-accessible per the AiPCBA datasheet summary), 1KB of on-chip RAM, a 6 MHz internal bus, multiple 16-bit timer channels, an SCI (UART) interface, and a 42-pin SPDIP footprint that is drop-in compatible with the rest of the HC908BD family. The 5V supply rail allows direct interface to legacy 5V logic without level shifters, which is one reason the part persists in industrial designs more than two decades after its introduction.
The 6 MHz bus clock and CISC instruction set execute most HC08 instructions in 2 to 5 bus cycles, giving roughly 1.2 to 3 MIPS sustained throughput. The architecture includes a memory-mapped I/O block, an on-chip oscillator with trimming, and a low-voltage inhibit / COP watchdog for safety-critical appliance control. The 42-pin SPDIP is convenient for prototyping and through-hole rework on legacy boards.
Typical applications include washing-machine and dishwasher control boards, HVAC blower controllers, microwave-oven front panels, and other 5V white-goods or appliance control subsystems. Designers also use the MC908BD48IBE in industrial instrumentation that does not require the latest low-power cores, leveraging the deterministic interrupt response and the easy in-circuit programming of the HC08BD flash.
When designing with this part, plan the I/O budget against the 42-pin SPDIP: pin count is the most common constraint when porting to or from the larger 48- or 56-pin variants. Note that newer NXP S08 and Kinetis E-series parts offer a software-compatible migration path for new designs while keeping the existing 5V SPDIP board layout.
This page synthesises distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas directas para MC908BD48IBE — 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 MC908BD48IBE (mismo factor de forma y huella) — difiere en Program Memory Size, Mounting Type, Core Architecture, Data Bus Width, Package.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MC908BD48IBE
✅ Sustitución directa✓ En stock
$8.6 / unidad
Ver hoja de datos →MC908AP32ACBE
✅ Sustitución directa✓ En stock
Consulte el precio
Ver hoja de datos →MC908AP8ACBE
✅ Sustitución directa✓ En stock
$7.15 / unidad
Ver hoja de datos →MC908BD48IBE Valores máximos y características eléctricas
| Core | HC08 (M68HC08 CISC, 8-bit) |
| Processor Series | HC08BD |
| Ancho del bus de datos | 8 bit |
| Maximum Bus Frequency | 6 MHz |
| Program Memory Size | 48 KB (47 KB user-accessible) Flash |
| RAM Size | 1 KB |
| Tensión de alimentación | 5 V (typical HC08 Vdd range) |
| Encapsulado | 42-PDIP / SPDIP (42-pin Shrink PDIP, through-hole) |
| Tipo de montaje | Through-Hole |
| Timers | Multiple 16-bit timer channels |
| Watchdog / COP | Yes (COP watchdog) |
| AEC-Q100 | not_applicable (industrial / appliance grade) |
Configuración de pines de MC908BD48IBE
| Pin 1 | IRQ — External interrupt request input |
| Pin 2 | TCLK — Timer clock input |
| Pin 3 | PTA0 — Port A bit 0 (general-purpose I/O) |
| Pin 4 | PTA1 — Port A bit 1 (general-purpose I/O) |
| Pin 5 | PTA2 — Port A bit 2 (general-purpose I/O) |
| Pin 6 | PTA3 — Port A bit 3 (general-purpose I/O) |
| Pin 7 | Vss — Ground |
| Pin 8 | PTA4 — Port A bit 4 (general-purpose I/O) |
| Pin 9 | PTA5 — Port A bit 5 (general-purpose I/O) |
| Pin 10 | PTA6 — Port A bit 6 (general-purpose I/O) |
| Pin 11 | PTA7 — Port A bit 7 (general-purpose I/O) |
| Pin 12 | PTB0 — Port B bit 0 (general-purpose I/O) |
| Pin 13 | PTB1 — Port B bit 1 (general-purpose I/O) |
| Pin 14 | PTB2 — Port B bit 2 (general-purpose I/O) |
| Pin 15 | PTB3 — Port B bit 3 (general-purpose I/O) |
| Pin 16 | PTB4 — Port B bit 4 (general-purpose I/O) |
| Pin 17 | PTB5 — Port B bit 5 (general-purpose I/O) |
| Pin 18 | PTB6 — Port B bit 6 (general-purpose I/O) |
| Pin 19 | PTB7 — Port B bit 7 (general-purpose I/O) |
| Pin 20 | PTC0 — Port C bit 0 (general-purpose I/O) |
| Pin 21 | PTC1 — Port C bit 1 (general-purpose I/O) |
| Pin 22 | PTC2 — Port C bit 2 (general-purpose I/O) |
| Pin 23 | PTC3 — Port C bit 3 (general-purpose I/O) |
| Pin 24 | PTC4 — Port C bit 4 (general-purpose I/O) |
| Pin 25 | PTC5 — Port C bit 5 (general-purpose I/O) |
| Pin 26 | PTC6 — Port C bit 6 (general-purpose I/O) |
| Pin 27 | PTC7 — Port C bit 7 (general-purpose I/O) |
| Pin 28 | Vdd — 5V supply input |
| Pin 29 | OSC1 — Crystal oscillator input |
| Pin 30 | OSC2 — Crystal oscillator output |
| Pin 31 | RESET — Active-low reset input |
| Pin 32 | PTD0 — Port D bit 0 (general-purpose I/O / SCI TXD) |
| Pin 33 | PTD1 — Port D bit 1 (general-purpose I/O / SCI RXD) |
| Pin 34 | PTD2 — Port D bit 2 (general-purpose I/O) |
| Pin 35 | PTD3 — Port D bit 3 (general-purpose I/O) |
| Pin 36 | PTD4 — Port D bit 4 (general-purpose I/O) |
| Pin 37 | PTD5 — Port D bit 5 (general-purpose I/O) |
| Pin 38 | PTD6 — Port D bit 6 (general-purpose I/O) |
| Pin 39 | PTD7 — Port D bit 7 (general-purpose I/O) |
| Pin 40 | PTE0 — Port E bit 0 (general-purpose I/O) |
| Pin 41 | PTE1 — Port E bit 1 (general-purpose I/O) |
| Pin 42 | Vss — Ground |
Aplicaciones típicas
MC908BD48IBE es adecuado para 6 aplicacións: Washing Machine Control Board, HVAC Blower and Fan Controller, Microwave Oven Front Panel, Dishwasher Control Subsystem, Industrial Instrumentation Front End, Legacy White-Goods Replacement Board.
Washing Machine Control Board
The MC908BD48IBE's 48 KB Flash and 1 KB RAM fit typical washing-machine main controller firmware that drives motor TRIACs, water-level sensing, the door lock and the front-panel UI. The 5V-tolerant HC08 I/O interfaces directly to legacy optotriac drivers and 5V display drivers without level shifters, and the multiple 16-bit timer channels generate the PWM outputs needed for variable-speed motor control.
Recomendado
HVAC Blower and Fan Controller
The HC08BD's 6 MHz bus clock and deterministic interrupt latency suit HVAC blower controllers that switch triac-fired motor windings and read NTC temperature sensors in real time. The 48 KB Flash holds lookup tables for fan curves and protection logic, while the 42-pin SPDIP package simplifies through-hole assembly for service-replaceable boards.
Recomendado
Microwave Oven Front Panel
Microwave front-panel modules use the MC908BD48IBE to scan a matrix keypad, drive a 7-segment / VFD display and time the magnetron duty cycle through a triac. The 1 KB RAM buffers scan codes and timer ticks, and the COP watchdog prevents the magnetron from being left on if firmware ever locks up. The 5V supply matches legacy VFD driver ICs directly.
Dishwasher Control Subsystem
Dishwasher controllers benefit from the MC908BD48IBE's 48 KB Flash for cycle logic, 1 KB RAM for state-machine context, and SCI interface for diagnostic UART communication with service tools. The 42-pin SPDIP keeps the board reworkable on the production line, and the HC08BD's 5V I/O avoids level-shifters for solenoid and pump triac drivers.
Industrial Instrumentation Front End
Industrial instrumentation front ends use the MC908BD48IBE for sensor conditioning control, calibration storage in Flash, and an SCI (UART) link to a host PLC or display module. The 6 MHz bus is sufficient for slow-loop PID control of temperature, pressure and level sensors, and the deterministic HC08 interrupt response simplifies IEC 61131-style deterministic loops.
Legacy White-Goods Replacement Board
Service and aftermarket replacement boards for legacy white-goods use the MC908BD48IBE because the 42-pin SPDIP is pin-compatible with the rest of the HC908BD family, making it a drop-in for failed original parts. The authorised aftermarket supply chain (Rochester Electronics, franchised distributors) supports multi-year maintenance of installed appliances where board redesign is uneconomic.
Resumen de productos recomendados
Datos de referencia de ingeniería para MC908BD48IBE — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC908AP32ACBE | MC908AP8ACBE |
|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 42-PDIP (SPDIP) | 42-PDIP (SPDIP) - same | 42-PDIP (SPDIP) - same |
| Core | HC08 (8-bit CISC) | HC08 (8-bit CISC) - same family | HC08 (8-bit CISC) - same family |
| Maximum Bus Frequency | 6 MHz | 6 MHz | 6 MHz |
| Program Memory (Flash) | 48 KB | 32 KB (-33%) | 8 KB (-83%) |
| Supply Voltage | 5 V | 5 V | 5 V |
| Lifecycle Status | NRND | NRND | NRND |
| Pin Count | 42 | 42 - same | 42 - same |
Diferenciadores clave
- Largest Flash density in the HC08BD 42-pin SPDIP family (frente a MC908AP32ACBE)
- Substantially more Flash than the smallest 42-pin SPDIP HC08 variant (frente a MC908AP8ACBE)
- Documented authorised-aftermarket supply (frente a Generic NRND 8-bit MCU)
Notas de diseño
The MC908BD48IBE operates from a single 5V supply; the Vdd/Vss pair should be decoupled with a 100 nF ceramic placed within 5 mm of the package pins and a bulk 10 uF tantalum or aluminium electrolytic on the same node. The HC08 core draws a few mA in active run mode; check the datasheet current-vs-frequency chart and derate for industrial temperature operation. Add a power-on reset capacitor (typ. 1 uF) on the RESET pin to ensure clean cold-boot behaviour.
Place the 6 MHz crystal or ceramic resonator within a few millimetres of the OSC1/OSC2 pins and guard the traces with a ground ring to minimise EMI pickup into the bus-clock-sensitive HC08 core. The 42-pin SPDIP through-hole footprint gives generous creepage but watch for noisy TRIAC / relay traces crossing under or near the MCU - route the ground plane so noisy return currents do not flow under the device.
Because the MC908BD48IBE is NRND, confirm authorised-distributor supply before committing to a new production run; Rochester Electronics is the most reliable long-term source for this part. Watch out for counterfeit risk: request date code / lot traceability and reject parts with re-marked tops. For new designs, prefer an NXP S08 or Kinetis E-series equivalent to avoid lifecycle risk.
Información de cumplimiento
RoHS / lead-free / halogen-free / REACH status could not be confirmed from the verified web data; treat as unknown until verified against the NXP material declaration. The part is industrial / appliance grade and is not AEC-Q100 qualified.
