MC68HC705C8AFNE - 8-bit HC05 MCU 8KB OTP 44-PLCC | NXP
Référence : MC68HC705C8AFNE ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $15.57 | $15,57 |
| 10 | $13.95 | $139,50 |
| 100 | $11.4 | $1 140,00 |
| 500 | $9.85 | $4 925,00 |
| 1 000 | $8.6 | $8 600,00 |
MC68HC705C8AFNE Présentation
Background: An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/Flash/OTP), data memory (RAM), and programmable I/O peripherals on one die. The HC05 family from Motorola/Freescale/NXP is one of the longest-lived M68HC05 architectures, designed for low-cost, high-reliability embedded control in appliances, automotive body electronics, and industrial sensors. HC05 sits within the broader taxonomy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC.
Key features include a CISC HC05 core, 8KB OTPROM for code storage, 304-byte RAM, 16-bit timer with input capture/output compare, an 8-bit PWM timer, a synchronous serial peripheral interface (SPI) and a serial communications interface (SCI/UART), an 8-channel 8-bit ADC, and a programmable low-voltage reset. Operating voltage is 3.0V to 5.5V with commercial temperature grade (0C to +70C). The 44-pin PLCC package gives ample I/O for human-machine-interface and motor-control front-ends.
The HC05 core uses a fixed instruction set with multiple addressing modes, an accumulator-based ALU, and a 16-bit program counter that can address up to 8KB. Program memory is implemented as UV-erasable EPROM on the C8A die, but the FNE suffix denotes the OTPROM windowless production variant intended for factory programming. The 304-byte SRAM is split between a 192-byte user RAM block and 112 bytes of stack/I/O register area.
Typical applications include appliance control boards (washing machines, microwave ovens, HVAC dampers), automotive body controllers (window lift, mirror, seat modules where the part remains in production or service stock), security alarm panels, and low-cost industrial timer/counter boards. Its on-chip ADC and PWM also suit white-goods inverter control loops at modest switching rates.
Design consideration: because OTPROM is one-time programmable, code must be fully validated in emulation (using the EPROM-based MC68HC705C8ACE or RAM-part EVB) before committing to the OTPROM FNE variant. Provision a self-boot mode and consider the 44-pin PLCC socket footprint for field-replaceability.
This page consolidates distributor pricing, drop-in alternative 68HC05 family parts, and practical design notes that are not all present in the legacy MC68HC705C8A datasheet.
Alternatives de remplacement direct pour MC68HC705C8AFNE — 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 MC68HC705C8AFNE (même facteur de forme et même empreinte) — différant par Mounting Type, Core Architecture, Program Memory Size.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MC68HC705C8ACFNE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68HC705C8AFNER
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68HC705C9ACFN
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MCHSC705C8ACFNE
✅ Remplacement direct✓ En stock
$9.85 / unité
Voir la fiche technique →MC705C8ACFNER
✅ Remplacement direct✓ En stock
$13.7957 / unité
Voir la fiche technique →MC68HC705C8AFNE Valeurs maximales et caractéristiques électriques
| Core Architecture | HC05 (M68HC05 family, 8-bit CISC) |
| Program Memory | 8 KB OTPROM (one-time programmable) |
| RAM | 304 bytes (192 user + 112 stack/I/O) |
| Bus Clock / CPU Frequency | 2.1 MHz (max internal bus) |
| Supply Voltage (Vdd) | 3.0 V to 5.5 V (3.3 V / 5 V operation) |
| Température de fonctionnement | 0 C to +70 C (commercial) |
| Boîtier | 44-pin PLCC (J-lead, 16.59 x 16.59 mm) |
| Type de montage | Surface Mount (PLCC socket compatible) |
| I/O Pins | 31 bidirectional (per 44-PLCC variant) |
| Timers | 16-bit TIM (IC/OC) + 8-bit PWM timer |
| Serial Interfaces | SCI (UART) + SPI (synchronous) |
| ADC | 8-channel, 8-bit successive-approximation |
| Resets | Power-on + programmable low-voltage reset |
| Interrupts | External IRQ + 14 internal sources |
| Compliance | RoHS compliant (Pb-free finish) |
Configuration des broches de MC68HC705C8AFNE
| Broche 1 | IRQ — External interrupt request input (also TCAP for TIM) |
| Broche 2 | TCMP — Timer compare output |
| Broche 3 | PD0/TCMP — Port D bit 0 / timer compare (alt) |
| Broche 4 | PD1/TDO — Port D bit 1 / timer output |
| Broche 5 | PD2 — Port D bit 2 |
| Broche 6 | PD3 — Port D bit 3 |
| Broche 7 | PD4/SS — Port D bit 4 / SPI slave select |
| Broche 8 | PD5/MOSI — Port D bit 5 / SPI master out slave in |
| Broche 9 | Vdd — Positive supply (3.0-5.5 V) |
| Broche 10 | OSC1 — Crystal oscillator input |
| Broche 11 | Vss — Ground reference |
| Broche 12 | OSC2 — Crystal oscillator output |
| Broche 13 | PA0/ADC0 — Port A bit 0 / ADC channel 0 |
| Broche 14 | PA1/ADC1 — Port A bit 1 / ADC channel 1 |
| Broche 15 | PA2/ADC2 — Port A bit 2 / ADC channel 2 |
| Broche 16 | PA3/ADC3 — Port A bit 3 / ADC channel 3 |
| Broche 17 | PA4/ADC4 — Port A bit 4 / ADC channel 4 |
| Broche 18 | PA5/ADC5 — Port A bit 5 / ADC channel 5 |
| Broche 19 | PA6/ADC6 — Port A bit 6 / ADC channel 6 |
| Broche 20 | PA7/ADC7 — Port A bit 7 / ADC channel 7 |
| Broche 21 | VrefH — ADC high reference voltage |
| Broche 22 | VrefL — ADC low reference voltage |
| Broche 23 | PB0 — Port B bit 0 |
| Broche 24 | PB1 — Port B bit 1 |
| Broche 25 | PB2/TxD — Port B bit 2 / SCI transmit |
| Broche 26 | PB3/RxD — Port B bit 3 / SCI receive |
| Broche 27 | PB4/MISO — Port B bit 4 / SPI master in slave out |
| Broche 28 | Vss — Ground reference (second bond) |
| Broche 29 | PB5/SPSCK — Port B bit 5 / SPI clock |
| Broche 30 | PB6 — Port B bit 6 |
| Broche 31 | PB7 — Port B bit 7 |
| Broche 32 | PC0 — Port C bit 0 |
| Broche 33 | PC1 — Port C bit 1 |
| Broche 34 | PC2 — Port C bit 2 |
| Broche 35 | PC3 — Port C bit 3 |
| Broche 36 | PC4 — Port C bit 4 |
| Broche 37 | PC5 — Port C bit 5 |
| Broche 38 | PC6 — Port C bit 6 |
| Broche 39 | PC7 — Port C bit 7 |
| Broche 40 | RESET — Active-low reset input |
| Broche 41 | PE0 — Port E bit 0 |
| Broche 42 | PE1 — Port E bit 1 |
| Broche 43 | PE2 — Port E bit 2 |
| Broche 44 | Vdd — Positive supply (second bond) |
Applications typiques
MC68HC705C8AFNE convient pour 6 applications: White-Goods Appliance Control, Automotive Body Electronics, Security and Alarm Panels, Industrial Timer and Counter Boards, HVAC Damper and Fan Control, Low-Cost Consumer Remote and Toy Controllers.
White-Goods Appliance Control
The MC68HC705C8AFNE is well suited for washing-machine, dishwasher and microwave-oven control boards. Its 8 KB OTPROM fits mid-complexity state machines for motor sequencing and user-interface handling, while the on-chip 16-bit timer with input capture drives tacho feedback from the drum or fan motor at 2.1 MHz bus clock. The integrated 8-bit PWM timer generates low-frequency drive signals for solenoid valves and triac-fired heater elements without an external PWM controller. The 8-channel 8-bit ADC reads water level, temperature and door-switch sensors directly, removing the need for an external analog front end. The 44-pin PLCC package gives 31 bidirectional I/O lines, enough to scan 4x5 keypads plus a multiplexed 7-segment display.
Recommandé
Automotive Body Electronics
The MC68HC705C8AFNE historically powered automotive body controllers such as window lift, mirror adjust and seat-position modules. Its 8 KB OTPROM and 304-byte RAM are sized for fixed-function control loops, while the SCI (UART) links the module to the body-CAN gateway through an external transceiver. The 16-bit timer with input capture handles Hall-sensor decoding for window and seat motors, and the 8-bit PWM drives mirror-fold and seat-heater loads. Although the part is NRND in 2026, service stock and franchised aftermarket supply from Rochester Electronics keeps installed fleets running; AEC-Q100 automotive grade is not qualified on this part number, so it is limited to non-safety body domains.
Recommandé
Security and Alarm Panels
The MC68HC705C8AFNE fits security alarm panels and PIR sensor controllers because it integrates SCI for central-station dialer communication, an 8-bit ADC for analog sensor reading, and a low-voltage reset that protects against brown-outs during line-power events. The 8 KB OTPROM holds sensor-debounce, dialer handshake and event-log state machines. The 16-bit timer manages piezo sounder PWM and entry/exit delay counters without external logic, and the 8-bit PWM timer drives LED status indicators. Operating voltage of 3.0-5.5 V lets the panel run directly from a 3.6 V backup battery stack with simple regulation.
Recommandé
Industrial Timer and Counter Boards
The MC68HC705C8AFNE suits DIN-rail timer, counter and process-interlock boards that need a deterministic 8-bit core without a real-time OS. Its 16-bit timer with input capture counts pulses from flow meters or encoders at 2.1 MHz, while the 8-bit PWM timer drives opto-isolated 4-20 mA loops and SSR triggers. The 8-channel ADC reads 0-10 V process inputs, and the SCI provides RS-485 or RS-232 communication to a PLC. The 304-byte RAM is sufficient for small lookup tables and stack depth in ladder-logic-style code, and the 44-PLCC package drops onto legacy control boards that were designed around the same pinout.
Recommandé
HVAC Damper and Fan Control
The MC68HC705C8AFNE drives HVAC damper actuators and variable-speed fan controllers where its on-chip peripherals replace external logic. The 8-bit PWM timer modulates TRIAC firing angles for 120/230 VAC fan motors, while the 16-bit timer with output compare commutates brushless DC fans. The 8-channel 8-bit ADC reads temperature sensors (NTC thermistors) and pressure switches without an analog MUX, and the SCI/UART links the damper board to the building automation bus. Operating from 3.0-5.5 V lets the same hardware run from 24 VAC-derived rails or from a 3.3 V logic supply, with the 8 KB OTPROM holding the PID control loop and Modbus handshake.
Recommandé
Low-Cost Consumer Remote and Toy Controllers
The MC68HC705C8AFNE is a low-cost choice for toy, hobby and consumer remote controllers where its 8 KB OTPROM, 304-byte RAM, and 31 I/O lines cover key-decode, IR transmit/receive and simple motor PWM in a single chip. The 16-bit timer with input capture decodes RC servo pulses or IR carrier edges at 2.1 MHz, while the 8-bit PWM timer drives hobby servos and DC motor H-bridges. The SCI provides optional wired debugging or bootloader access during factory programming. The 44-PLCC socket footprint supports rapid hand-rework on assembly lines, which matters for short consumer-product lifecycles.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC68HC705C8AFNE — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MC68HC705C8ACFNE | MC68HC705C9ACFN | MCHSC705C8ACFNE | MC705C8ACFNER |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 44-PLCC (J-lead, 16.59x16.59 mm) | 44-PLCC (J-lead) - same | 44-PLCC (J-lead) - same | 44-PLCC (J-lead) - same | 44-PLCC (J-lead) - same |
| Core | HC05 8-bit CISC, 2.1 MHz bus | HC05 8-bit, 2.1 MHz | HC05 8-bit, 2.1 MHz | HSC05 8-bit, 2.1 MHz | HC05 8-bit, 2.1 MHz |
| Program Memory | 8 KB OTPROM | 8 KB EPROM (UV window) | 16 KB OTPROM (+100%) | 8 KB EPROM (HSC05) | 8 KB EPROM |
| RAM | 304 bytes | 304 bytes | 352 bytes (+16%) | 304 bytes | 304 bytes |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| ADC | 8-channel, 8-bit | 8-channel, 8-bit | 8-channel, 8-bit | 8-channel, 8-bit | 8-channel, 8-bit |
| Memory Type (Production) | OTPROM (windowless) | EPROM (UV window) | OTPROM (windowless) | EPROM (UV window) | EPROM (UV window) |
Principaux différenciateurs
- Same-die EPROM sibling with UV window for development (vs MC68HC705C8ACFNE)
- Doubled code space in the same 44-PLCC footprint (vs MC68HC705C9ACFN)
- High-speed HSC05 variant available for throughput-sensitive designs (vs MCHSC705C8ACFNE)
- Production-volume tape-and-reel suffix for automated assembly (vs MC68HC705C8AFNER)
Notes de conception
Because the FNE suffix indicates one-time programmable (OTPROM) memory, code cannot be erased or rewritten after programming. Validate firmware on the EPROM-windowed MC68HC705C8ACFNE or on a RAM-part EVB before committing to FNE production units. A single locked-out batch can scrap an entire production run; budget for prototype CFE parts in the design phase.
The MC68HC705C8AFNE draws roughly 5-10 mA active at 5 V and 2.1 MHz, depending on peripheral enable. For battery-backed designs, use the STOP and WAIT low-power modes and gate unused peripherals via the CONFIG register. The low-voltage reset block (programmable threshold around 3.0-4.5 V) protects RAM integrity during brown-outs, so set the LVRE bit appropriately for the supply rail.
Place a 0.1 uF ceramic decoupling capacitor as close as possible to both Vdd pins (9 and 44) and tie both Vss pins (11 and 28) to a solid ground plane. The 44-PLCC socket allows field replacement; reserve clearance around the socket for a PLCC extraction tool. If the design uses the on-chip ADC, add a small RC filter on VrefH/VrefL and route analog PA0-PA7 away from the SPI/SCI digital lines to reduce crosstalk.
The crystal or ceramic resonator on OSC1/OSC2 should be placed within 5 mm of the pins with a ground guard ring, and the trace between OSC1 and OSC2 should be short and symmetric. Avoid routing the SCI TX/RX lines (PB2/PB3) near the PWM outputs (TCMP) to prevent radiated-noise coupling back into the UART receiver at high baud rates.
Informations de conformité
RoHS and lead-free per NXP/Freescale legacy product listings; AEC-Q100 not qualified (commercial temperature grade only); halogen-free status not explicitly confirmed in distributor data and is marked unknown.
