MC908QB4CPE - 8-Bit HC08 MCU 4KB Flash 16-PDIP | NXP
Référence : MC908QB4CPE ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $6.92 | $6,92 |
| 10 | $6.18 | $61,80 |
| 100 | $5.42 | $542,00 |
| 500 | $4.65 | $2 325,00 |
| 1 000 | $4.1 | $4 100,00 |
MC908QB4CPE Présentation
What is an HC08 8-bit microcontroller? The HC08 is Freescale/NXP's 8-bit CISC microcontroller architecture that evolved from the earlier M68HC05 family, retaining binary code compatibility with HC05 while offering an enhanced instruction set, improved stack handling, and FLASH program memory. Within the broader taxonomy, the HC08 sits as a member of the 8-bit microcontroller category, which itself is part of the microcontroller unit (MCU) -> embedded processor -> semiconductor hierarchy. Compared with newer 16- and 32-bit ARM Cortex-M parts, HC08 devices trade raw throughput for ultra-low cost, deterministic interrupt response, and a simple tool chain that suits high-volume, latency-tolerant products.
Key features of the MC908QB4CPE include 4 KB (4K x 8) of embedded FLASH, 128 bytes of RAM, a multi-channel 8-bit ADC, a 16-bit timer with pulse-width modulation capability, and a user-selectable internal oscillator. The device supports in-circuit reprogramming, hardware breakpoints and a built-in monitor ROM that simplifies firmware development with Freescale/NXP HC08 tool chains. Compared with mask-ROM HC908 variants, the FLASH-based C-suffix part allows field upgrades and late-stage prototype iteration without package re-spin.
Architecture and process details: the MC908QB4CPE is fabricated with CMOS FLASH technology and pairs the HC08 CPU core with standard on-chip peripherals including serial communications and general-purpose I/O. Performance is driven by the 8 MHz internal bus clock, which delivers roughly 1 MIPS per MHz of operation. Designers should consult the MC908QB4 datasheet for the exact peripheral map and memory register layout.
Typical application use-cases include small-appliance controllers, white-goods user interfaces, remote-control transmitters, automotive body electronics (mirror, lighting, seat modules), industrial sensor signal conditioning blocks, and battery-powered low-end consumer products. The wide operating voltage range (typical 2.7 V-5.5 V) and small 16-pin PDIP form factor also suit hobbyist and educational platforms.
Key design consideration: verify whether HC08 assembly or C tool-chain support meets the project timeline. Many modern compilers have deprecated HC08 support, and engineers may need to source legacy Freescale CodeWarrior HC08 or compatible third-party tools. Also confirm that long-term supply is acceptable - the device is approaching end-of-life per distributor listings, so consider an NXP/Freescale 9S08 or small-pin PIC/AVR drop-in alternative as a hedge.
This page synthesizes current distributor pricing from DigiKey/Mouser/Octopart, cross-reference alternatives and practical design notes not found in the bare manufacturer datasheet, optimized for engineers selecting or replacing the MC908QB4CPE in legacy 8-bit designs.
Alternatives de remplacement direct pour MC908QB4CPE — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MC908QB4CPE (même facteur de forme et même empreinte) — différant par Core Architecture, Mounting Type, ADC, Program Memory Size, RAM Size.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MC68HC908QB4CPE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MCHC908JK3ECPE
✅ Remplacement direct✓ En stock
$3.65 / unité
Voir la fiche technique →MC68HC908QY2CPE
✅ Remplacement direct✓ En stock
$2.69 / unité
Voir la fiche technique →MC908QB8CPE
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MC908QY4CPE
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MC908QB4CPE Valeurs maximales et caractéristiques électriques
| Manufacturer | NXP Semiconductors (formerly Freescale Semiconductor) |
| Part Family | M68HC08 (HC08) |
| Core Architecture | HC08 8-bit CISC CPU |
| Program Memory Type | FLASH |
| Program Memory Size | 4 KB (4K x 8) |
| RAM Size | 128 bytes |
| Bus Speed | 8 MHz |
| Package Type | 16-PDIP (Plastic DIP, 0.300 inch / 7.62 mm) |
| Type de montage | Through-Hole |
| Internal Oscillator | User-selectable (per family feature) |
| In-Circuit Programming | Supported (FLASH-based) |
| Data Code Suffix | CPE indicates 16-PDIP package, industrial temperature, lead-free |
| Statut RoHS | Compliant (lead-free) |
| Niveau MSL | Not Applicable (through-hole package) |
Configuration des broches de MC908QB4CPE
| Broche 1 | IRQ — External interrupt request input |
| Broche 2 | OSC1 — Crystal/oscillator input 1 |
| Broche 3 | OSC2 — Crystal/oscillator output 2 |
| Broche 4 | RST — Reset input (active low) |
| Broche 5 | VDD — Positive supply voltage |
| Broche 6 | VSS — Ground reference |
| Broche 7 | PTA0 — Port A bit 0 / ADC channel (per family variant) |
| Broche 8 | PTA1 — Port A bit 1 |
| Broche 9 | PTA2 — Port A bit 2 |
| Broche 10 | PTA3 — Port A bit 3 |
| Broche 11 | PTB0 — Port B bit 0 |
| Broche 12 | PTB1 — Port B bit 1 |
| Broche 13 | PTB2 — Port B bit 2 |
| Broche 14 | PTB3 — Port B bit 3 |
| Broche 15 | PTC0 — Port C bit 0 / TX |
| Broche 16 | PTC1 — Port C bit 1 / RX |
Applications typiques
MC908QB4CPE convient pour 6 applications: Small Appliance Control Board, Automotive Body Electronics Module, Remote Control / IR Transmitter, Industrial Sensor Signal Conditioner, White-Goods User Interface Panel, Battery-Powered Consumer Gadget.
Small Appliance Control Board
The MC908QB4CPE is a strong fit for small-appliance controllers such as toasters, coffee makers, blenders and handheld vacuum cleaners where cost dominates BOM decisions. Its 4 KB FLASH holds typical state-machine firmware for sensor reading, PWM heating-element control and front-panel key handling, while the HC08 8 MHz bus provides deterministic interrupt response for safety timers and watchdog logic. The 16-pin PDIP through-hole package also simplifies hand-rework and unit replacement in field-service environments common to appliance repair channels.
Recommandé
Automotive Body Electronics Module
The MC908QB4CPE's industrial temperature grade (-40 C to +85 C typical) and 5 V supply tolerance suit it to non-safety automotive body modules such as mirror controls, seat adjusters or interior lighting drivers. The HC08 16-bit timer module drives MOSFET gate PWM directly, while the 8-bit ADC samples potentiometer or current-sense feedback for closed-loop regulation. Although the device is NRN'D, legacy automotive platforms continue to use it in low-volume service replacements where AEQ-100 is not mandatory.
Recommandé
Remote Control / IR Transmitter
For infrared remote controls, wireless key fobs and RF-transmitter peripherals, the MC908QB4CPE offers ample 4 KB FLASH to encode RC5, NEC or SIRC protocol tables plus low-battery detection logic. The HC08 core's low active current combined with simple wake-from-interrupt flow keeps battery life predictable. The 16-PDIP package accommodates hand-soldered prototypes and short production runs typical of remote-control designs.
Recommandé
Industrial Sensor Signal Conditioner
The MC908QB4CPE fits industrial 4-20 mA loop-powered sensor modules where its HC08 8-bit ADC digitizes transducer outputs and the FLASH holds calibration tables and linearization curves. Wide 2.7 V-5.5 V supply tolerance and an industrial temperature range ensure operation across harsh plant floors. The 16-PDIP footprint also makes the module easy to rework when calibration constants are revised in late-stage NPI.
Recommandé
White-Goods User Interface Panel
User-interface panels in washing machines, dishwashers and ovens pair the MC908QB4CPE with multiplexed 7-segment or LCD displays where the 13-I/O count of the 16-PDIP package drives both key scanning and LED/segment multiplexing. FLASH-based firmware lets design teams iterate copy text, language tables and diagnostic routines without re-spinning mask ROM. The HC08's deterministic timing also simplifies capacitive-touch firmware ported from earlier HC05/HCS08 designs.
Recommandé
Battery-Powered Consumer Gadget
Battery-powered hobbyist gadgets, low-end toys and portable measurement tools find the MC908QB4CPE attractive for its FLASH flexibility and wide supply-voltage tolerance. Engineers can adopt low-power HC08 STOP/WAIT modes for shelf life and rely on in-circuit reprogramming for late-stage feature additions. The 16-PDIP through-hole footprint suits through-hole prototyping boards popular in education and maker communities.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC908QB4CPE — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MC68HC908QB4CPE | MCHC908JK3ECPE | MC68HC908QY2CPE | MC908QB8CPE | MC908QY4CPE |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors (mask-ROM) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 16-PDIP (0.300 inch) | 16-PDIP (0.300 inch) - same | 16-PDIP - same | 16-PDIP - same | 16-PDIP - same | 16-PDIP - same |
| Program Memory | 4 KB FLASH | 4 KB mask ROM | 4 KB FLASH | 2 KB FLASH | 8 KB FLASH | 4 KB FLASH |
| Core / Sub-Family | HC08 QB | HC08 QB (mask ROM) | HC08 JK | HC08 QY | HC08 QB | HC08 QY |
| Bus Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Mounting Type | Through-Hole | Through-Hole | Through-Hole | Through-Hole | Through-Hole | Through-Hole |
Principaux différenciateurs
- FLASH-based 4 KB program memory with HC08 QB peripheral mix (vs MC68HC908QB4CPE)
- Larger FLASH program memory (4 KB vs 2 KB) (vs MC68HC908QY2CPE)
- HC08 QB sub-family with broader timer/ADC feature mix (vs MCHC908JK3ECPE)
- 16-PDIP through-hole package for easy hand rework and prototyping (vs MC908QB8CPE)
Notes de conception
The MC908QB4CPE operates from a single 2.7 V-5.5 V supply per the HC08 family specifications; place a 0.1 uF decoupling capacitor as close as possible to the VDD pin (pin 5) and a bulk 10 uF tantalum or aluminum electrolytic capacitor at the regulator output. Estimated: total quiescent current draw in STOP mode is on the order of single-digit microamps based on family documentation, but the datasheet-specific value must be confirmed before low-power battery budget closure.
Treat the 'C' suffix as a packaging/grade marker, not a memory-size indicator - the memory size is encoded in the QB4 part-number segment. Also note that the MC908QB4CPE FLASH variant requires an in-circuit programming sequence via the BDM interface, NOT a parallel programmer. Engineers upgrading legacy HC908 designs must update their toolchain drivers and verify that their PE Micro or compatible programmer supports the latest FLASH security byte algorithm.
For through-hole 16-PDIP operation, junction-to-ambient thermal resistance is dominated by the lead frame and PCB copper. In free air without forced airflow, expect thermal resistance on the order of 80-100 C/W. At an industrial 85 C ambient, derate the device's continuous internal dissipation to approximately 200-300 mW to keep junction rise below 30 C; if the application requires more headroom, use the 16-SOIC or 20-SOIC package variant of the same die instead.
Keep the PCB trace from the regulator output to VDD shorter than 25 mm to avoid input-supply glitches. Route the RESET line (pin 4) away from PWM-driven outputs that exhibit high dv/dt to prevent unintended resets. The OSC1/OSC2 crystal traces (pins 2-3) must be short, symmetric, and guarded by a ground plane to maintain oscillator stability across the full industrial temperature range.
Informations de conformité
RoHS compliance confirmed via 'PE' lead-free suffix; AEC-Q100 not qualified (HC08 industrial-grade part); REACH and conflict-minerals status inherited from NXP standard reporting.
