MC908QB8MDTE - 8KB Flash 8-Bit HC08 MCU, 16-TSSOP | NXP
N.º de pieza: MC908QB8MDTE ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $6.42 | $6,42 |
| 10 | $5.78 | $57,80 |
| 100 | $4.96 | $496,00 |
| 500 | $4.12 | $2.060,00 |
| 1.000 | $3.45 | $3.450,00 |
MC908QB8MDTE Descripción general
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data memory (RAM), I/O peripherals, and a clock source onto one die. The HC08 family sits in the hierarchy 8-bit MCU -> microcontroller -> embedded processor -> semiconductor, and has historically been used in cost-sensitive automotive, appliance, and industrial control applications where deterministic execution and small footprint matter more than raw throughput.
Key features include 8KB of on-chip Flash (8K x 8), 256 bytes of RAM, an 8MHz internal bus, 13 GPIO pins, an integrated SCI (UART) and SPI peripheral, an internal clock source eliminating the need for an external crystal, and automotive-grade temperature rating (M-grade) suitable for under-hood and dashboard environments. The 16-TSSOP package has a 4.40 mm body width and is pin-compatible with other members of the MC908QB family.
The MC908QB8MDTE uses the M68HC08 CPU core, a von Neumann architecture with a 16-bit stack pointer, 16-bit index register (H:X), and an enhanced instruction set that adds several 16-bit operations on top of the original HC05 ISA. The 8MHz internal oscillator feeds the bus clock generator and can be trimmed by user code to compensate for temperature drift.
Typical applications include automotive body controllers, HVAC actuators, instrument cluster sub-modules, simple sensor interfaces, white-goods control boards, and low-cost remote keyless entry transmitters. The combination of internal oscillator, small Flash footprint, and SCI/SPI connectivity makes it well-suited as a low-cost slave controller or peripheral expander.
When designing with this MCU, note that the 16-TSSOP variant only exposes 13 I/O - some package pins are shared with supply, ground, or the on-chip debug interface, so plan your pin allocation before PCB layout. The 256-byte RAM limits stack depth to roughly 4-6 call levels, so large local buffers should be placed in Flash-emulated EEPROM or external memory.
This page synthesizes distributor stock levels, drop-in alternative MPNs, and practical design notes not found in the manufacturer datasheet alone, helping engineers evaluate the MC908QB8MDTE against modern replacements for new designs versus its intended role in long-lifecycle automotive systems.
Alternativas directas para MC908QB8MDTE — 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 MC908QB8MDTE (mismo factor de forma y huella) — difiere en Program Memory Size, Package, RAM Size, RoHS Status.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MC908QB4MDTE
✅ Sustitución directa✓ En stock
$1.55 / unidad
Ver hoja de datos →MC908QB8CDTE
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$1.78 / unidad
Ver hoja de datos →MC908QB8VDTE
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MC908AP16ACFUE
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MC9S08QG8CFD
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC908QB8MDTE Valores máximos y características eléctricas
| Core | HC08 (M68HC08) |
| Core Size | 8-bit |
| Program Memory Size | 8 KB (8K x 8) Flash |
| RAM Size | 256 B |
| Frecuencia de reloj máxima | 8 MHz |
| Number of I/O | 13 |
| Oscillator Type | Internal |
| Connectivity | SCI, SPI |
| Peripherals | LVD, MWD, TIM, SCI, SPI |
| Encapsulado / Carcasa | 16-TSSOP (4.40 mm body width) |
| Tipo de montaje | Surface Mount |
| Temperature Grade | Automotive (M-grade, -40C to +125C) |
| Packaging | Tube |
| Estado RoHS | Compliant |
| Lead Free | Yes |
Configuración de pines de MC908QB8MDTE
| Pin 1 | IRQ / RESET — External interrupt / reset input, active low |
| Pin 2 | PTA0 / TCLK — GPIO port A bit 0 / timer clock input |
| Pin 3 | PTA1 — GPIO port A bit 1 |
| Pin 4 | PTA2 — GPIO port A bit 2 |
| Pin 5 | PTA3 — GPIO port A bit 3 |
| Pin 6 | PTA4 — GPIO port A bit 4 |
| Pin 7 | PTA5 / SS — GPIO port A bit 5 / SPI slave select |
| Pin 8 | PTB0 / RxD — GPIO port B bit 0 / SCI receive |
| Pin 9 | PTB1 / TxD — GPIO port B bit 1 / SCI transmit |
| Pin 10 | PTB2 / SCLK — GPIO port B bit 2 / SPI clock |
| Pin 11 | PTB3 / MOSI — GPIO port B bit 3 / SPI master-out slave-in |
| Pin 12 | PTB4 / MISO — GPIO port B bit 4 / SPI master-in slave-out |
| Pin 13 | PTB5 — GPIO port B bit 5 |
| Pin 14 | PTC0 — GPIO port C bit 0 |
| Pin 15 | VDD — Positive supply voltage |
| Pin 16 | VSS — Ground reference |
Aplicaciones típicas
MC908QB8MDTE es adecuado para 7 aplicacións: Automotive Body Electronics Controllers, HVAC Actuator and Blower Controllers, Instrument Cluster Sub-Modules, Remote Keyless Entry (RKE) Transmitters, White Goods and Appliance Control Boards, Industrial Sensor Interface Modules, Low-Cost Peripheral Expander / Slave Controller.
Automotive Body Electronics Controllers
The MC908QB8MDTE's 8KB Flash, 13 GPIO, SCI/SPI peripherals, and -40C to +125C automotive (M-grade) temperature rating make it well suited for body-electronics modules such as door-lock controllers, mirror adjusters, and lighting sub-modules. Its 8MHz internal oscillator eliminates the external crystal, lowering BOM cost in volume production. Placement is typically between a CAN/LIN transceiver and low-side driver FETs, where the HC08 runs the application state machine and the SCI/SPI talk to the body controller. Trade-off: only 256B of RAM constrains stack depth and forces tight buffer management, but for body-electronics duty cycles this is rarely a blocker.
Recomendado
HVAC Actuator and Blower Controllers
In automotive HVAC actuators and blower-speed controllers, the MC908QB8MDTE drives power FETs through its 13 GPIO pins while reading temperature sensors via internal ADC channels and reporting to the body controller over SCI. Its automotive temperature grade and 8KB Flash comfortably fit typical HVAC state machines, including PWM ramp, debouncing, and fault detection. The internal oscillator saves board space and the 16-TSSOP package fits small actuator housings. Compared to newer S08 parts, the QB8 is preferred when legacy HVAC firmware is being maintained rather than rewritten.
Recomendado
Instrument Cluster Sub-Modules
The MC908QB8MDTE fits well in instrument-cluster sub-modules such as telltale drivers, odometer EEPROM managers, and gauge stepper controllers. Its SCI/SPI connectivity lets it act as a peripheral expander under a main cluster microcontroller, off-loading tasks like lamp dimming or stepper sequencing. The 8KB Flash is sufficient for small lookup tables and PWM schedules, and the internal oscillator removes the need for a separate timing component on the sub-board. Care must be taken with the 256B RAM limit when handling large CAN message buffers - typically only a partial-message model is feasible.
Recomendado
Remote Keyless Entry (RKE) Transmitters
The MC908QB8MDTE's small Flash (8KB), low pin count (16-TSSOP, 13 GPIO), internal oscillator, and SCI/SPI make it an inexpensive controller for RKE transmitter modules where battery life and BOM cost dominate. It can wake from a button interrupt, run a rolling-code algorithm, and drive an RF front-end over SPI. The internal oscillator eliminates a crystal that would otherwise draw quiescent current, extending coin-cell battery life. The 256B RAM is enough for bufferless rolling-code operations. Caveat: ensure your RKE protocol stack fits in 8KB of Flash, otherwise an S08 migration is required.
Recomendado
White Goods and Appliance Control Boards
The MC908QB8MDTE is well suited to white-goods controllers in washing machines, refrigerators, and dishwashers where its 8KB Flash stores user-interface state machines, timer logic, and motor-control sequences. The 13 GPIO can drive relays, read keypad matrices, and control triac-fired heater elements via zero-cross optos. SCI/SPI connectivity supports communication with inverter boards and user-interface displays. The internal oscillator removes a crystal from the cost-sensitive appliance BOM, while the wide operating temperature range supports laundry-room and kitchen thermal environments.
Recomendado
Industrial Sensor Interface Modules
In industrial sensor-interface modules such as 4-20 mA loop-powered transmitters, simple PLC I/O expanders, and low-cost process-signal conditioners, the MC908QB8MDTE's 13 GPIO, SCI/SPI connectivity, and internal oscillator enable compact sensor-conditioning designs. The automotive M-grade temperature rating provides margin for industrial cabinet environments. The 8KB Flash fits small linearization and calibration tables, while the SCI interface can present a digital representation of the conditioned analog signal to a host controller. Trade-off: the 256B RAM precludes large logging buffers - use external EEPROM via SPI if logging is required.
Recomendado
Low-Cost Peripheral Expander / Slave Controller
The MC908QB8MDTE works effectively as a low-cost peripheral expander or co-processor under a main MCU, off-loading tasks such as keypad scanning, LED multiplexing, or simple sensor reading. Host communication is typically via SPI (QSPI-compatible) at up to the bus-clock rate, and the 13 GPIO provide enough headroom for typical expander duty. Internal oscillator and small Flash keep the BOM minimal. Trade-off: only 256B of RAM means care is needed when implementing deep command buffers - typically a one-command-deep model is required.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC908QB8MDTE — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC908QB4MDTE | MC908QB8CDTE | MC908QB8VDTE | MC9S08QG8CFD |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 16-TSSOP (4.40 mm) | 16-TSSOP (4.40 mm) - same | 16-TSSOP (4.40 mm) - same | 16-TSSOP (4.40 mm) - same | 16-TSSOP (4.40 mm) - same |
| Core | HC08 (8-bit) | HC08 (8-bit) - same | HC08 (8-bit) - same | HC08 (8-bit) - same | S08 (8-bit, modern) |
| Program Memory | 8 KB Flash | 4 KB Flash (-50%) | 8 KB Flash - same | 8 KB Flash - same | 8 KB Flash - same |
| RAM | 256 B | 256 B - same | 256 B - same | 256 B - same | 512 B (+100%) |
| Maximum Clock | 8 MHz | 8 MHz - same | 8 MHz - same | 8 MHz - same | 20 MHz (+150%) |
| GPIO Count | 13 | 13 - same | 13 - same | 13 - same | 12 (-1) |
| Temperature Grade | Automotive (-40C to +125C) | Automotive (-40C to +125C) | Commercial (0C to +70C) | Industrial (-40C to +105C) | Automotive (-40C to +125C) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Active |
Diferenciadores clave
- 8KB Flash with automotive M-grade temperature rating (frente a MC908QB4MDTE)
- Internal oscillator eliminates external crystal (frente a STM8S003F3P6)
- Modern S08 core migration path on same footprint (frente a MC9S08QG8CFD)
Notas de diseño
Estimated: VDD operating range for the MC908QB8 family is typically 2.7 V to 5.5 V per the Freescale M68HC08 datasheet. Place a 100 nF ceramic decoupling capacitor as close as possible to pins 15 (VDD) and 16 (VSS), with a bulk 10 uF tantalum or aluminum capacitor on the supply rail. The internal oscillator is ratiometric to VDD, so supply-noise ripple directly modulates clock timing - use a ferrite bead if a switching regulator shares the rail.
The 16-TSSOP variant of the MC908QB8 only exposes 13 GPIO pins - three pins are reserved for VDD, VSS, and the IRQ/reset pin. Some second-source TSSOP-16 8-bit MCUs expose 14 or 16 GPIO, so do not assume pin-to-pin GPIO parity with non-NXP parts. The 256 B RAM also constrains stack depth to roughly 4-6 call levels - design your firmware so deeply nested recursion is avoided.
Keep the TSSOP-16 thermal pad clear of copper pours under the package - the 16-TSSOP variant does not use an exposed pad for heat-sinking. Route the SPI / SCI signals on the inner PCB layers with ground on the layer above and below to minimize crosstalk with the GPIO scan lines. Place the external interrupt / reset pull-up on pin 1 (typical 4.7 kohm to VDD) within 5 mm of the pin to avoid noise-induced resets in automotive environments.
Estimated: at 8 MHz internal oscillator and typical HC08 core activity, the MC908QB8MDTE draws on the order of 10-15 mA from VDD in active mode. With a 16-TSSOP thermal resistance (theta_JA) of approximately 110 C/W and automotive ambient up to +85C, junction rise is roughly 1.5-2 C - well within the +125C rating. No external heatsink is required for normal operation.
Información de cumplimiento
RoHS compliance confirmed by Worldway Electronics cross-reference entry. Other compliance fields (REACH, AEC-Q100, halogen-free) not explicitly stated in the verified web data and marked unknown accordingly. AEC-Q100 qualification status for the automotive (M-grade) variant should be confirmed with NXP product documentation.
