MCHRC705J1ACDWE - 8-Bit 4MHz 1.2KB OTP MCU | NXP
N.º de pieza: MCHRC705J1ACDWE ✗ Fin de vida| Cant. | Precio unitario | Total |
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| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
MCHRC705J1ACDWE Descripción general
An 8-bit microcontroller is a compact embedded-control device containing a CPU core, program memory, data memory, I/O, and basic peripherals on one semiconductor die. In the broader hierarchy, this part belongs to the embedded processor family, then the microcontroller family, and specifically the HC05 product line. The 4 MHz operating speed is suitable for compact control logic, simple human-interface functions, and low-cost embedded systems where code size, power consumption, and deterministic peripheral behavior matter more than high computational throughput.
Verified listings identify the HC05 core, 8-bit architecture, 4 MHz speed, 1.2 KB OTP program memory, 64 bytes of RAM, power-on reset, and watchdog timer. The program memory is OTP, meaning the stored program is intended for one-time programming rather than repeated field updates. The limited memory footprint also makes code-size budgeting and external peripheral integration important design considerations.
Typical uses include compact appliance controls, simple timers, push-button interfaces, low-speed indicator systems, basic sensor conditioning, and small industrial control modules. The HC05 core and peripheral set make the device relevant where a deterministic 8-bit control path is preferable to a higher-cost application processor. Its 1.2 KB program memory should be checked against the final firmware size before committing to the device.
When designing around MCHRC705J1ACDWE, verify the exact pinout, package variant, supply limits, oscillator connections, and programming interface from the authoritative device documentation before layout release. Because the part is reported as obsolete, engineers should also confirm availability, lifecycle status, and whether an active successor is required for new production programs.
This page consolidates verified distributor specifications, lifecycle information, package uncertainty, application guidance, and sourcing links into one engineering reference. It does not infer undocumented electrical limits or replace the manufacturer datasheet for design-in approval.
Alternativas directas para MCHRC705J1ACDWE — 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 MCHRC705J1ACDWE (mismo factor de forma y huella) — difiere en Package, Program Memory Type, Architecture, Program Memory Size, RAM Size.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
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$2.41 / unidad
Ver hoja de datos →MCHRC705J1ACDWE Valores máximos y características eléctricas
| Core Processor | HC05 |
| Core Size | 8-bit |
| Maximum Clock Speed | 4 MHz |
| Program Memory Size | 1.2 KB (1.2K x 8) |
| Program Memory Type | OTP |
| RAM Size | 64 x 8 bytes |
| Number of I/O | 14 |
| Peripherals | Power-on reset (POR) and watchdog timer (WDT) |
| Series | HC05 |
| Encapsulado | 20-SOIC (reported in one verified listing) |
| Alternate Package Report | 16-SOIC (reported in one verified distributor listing; requires confirmation) |
| EEPROM | Not listed in the provided verified data |
| Connectivity | Not listed in the provided verified data |
| Tipo de montaje | Surface mount |
| Estado RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | unknown |
| Estado del ciclo de vida | Obsolete, as reported in the provided verified data |
Guía de configuración de pines de MCHRC705J1ACDWE 16-soic (reported in one verified distributor listing; requires confirmation)
Configuración de pines para MCHRC705J1ACDWE (encapsulado 16-soic (reported in one verified distributor listing; requires confirmation)). Este CI digital incluye GPIO, interfaces de comunicación (UART, SPI, I2C) y pines de alimentación. Consulte la hoja de datos del fabricante para conocer las funciones alternativas de los pines y las opciones de configuración. Esencial para el diseño de sistemas embebidos y el diseño de PCB.
No hay datos detallados de patillaje disponibles para MCHRC705J1ACDWE.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
MCHRC705J1ACDWE es adecuado para 6 aplicacións: Compact Appliance Control, Basic Timer and Sequencer, Simple Sensor Interface, Relay and Indicator Panel, Battery-Powered Control Node, Legacy Product Maintenance.
Compact Appliance Control
The MCHRC705J1ACDWE fits compact appliance-control boards where an 8-bit control core, 4 MHz clock, and compact program footprint are sufficient for sequencing buttons, indicators, relays, or simple actuators. The verified HC05 specification provides 1.2 KB of OTP program memory and 64 bytes of RAM, so firmware must stay within a tightly bounded resource budget. A typical implementation places the MCU between a front-panel input network and a power or motor-control stage, using POR for predictable startup and WDT for recovery from software stalls. Because the verified data does not specify timer, PWM, or I/O electrical details, the exact interface and protection requirements must be confirmed from the authoritative datasheet before layout.
Recomendado
Basic Timer and Sequencer
For a timer, sequencer, or low-speed controller, the 4 MHz HC05 core can execute deterministic state-machine logic without the cost of a larger application processor. The verified 1.2 KB OTP memory and 64-byte RAM are appropriate only when the schedule, state variables, and diagnostic behavior remain small. A practical design would use WDT to reset a stuck task and POR to establish a known startup state, while external circuitry handles loads that exceed MCU drive capability. The supplied data does not confirm timer resolution or output-driver ratings, so those parameters must be checked before assigning timing-critical functions or choosing pull-up, level-shifting, or driver components.
Recomendado
Simple Sensor Interface
MCHRC705J1ACDWE can supervise a low-complexity sensor node when the sensor output is slow and the firmware only needs acquisition, filtering, thresholding, and local status reporting. Its 64 bytes of RAM limits buffering and protocol state, while 1.2 KB of OTP limits library and application code, so designers should avoid unnecessary abstraction layers. The MCU can gate sensor power, read a digital or suitably conditioned analog interface, and drive an indicator or alert output. The verified data does not specify ADC channels, comparator resources, sensor interfaces, or supply limits; those missing specifications must be confirmed before the device is approved for analog measurement or battery-operated operation.
Recomendado
Relay and Indicator Panel
A relay-and-indicator panel is a practical use when the HC05 device is used as a compact supervisory controller for status lamps, pushbuttons, alarm outputs, or low-power relay logic. The verified 14-I/O count provides a useful basis for partitioning inputs and outputs, but the actual pin assignments and electrical limits are not provided. Each relay driver should therefore be designed with appropriate transistor or driver isolation, flyback protection, and a separate supply path where needed. The 4 MHz processing speed is more than sufficient for ordinary debounce and sequencing logic, while POR and WDT support deterministic startup and recovery. Confirm pin direction, voltage domains, and absolute maximum ratings in the exact device documentation.
Recomendado
Battery-Powered Control Node
The MCHRC705J1ACDWE may be considered for a small battery-powered control node, but its suitability depends on supply range, sleep behavior, and current consumption that are not included in the supplied verified data. The 8-bit architecture and limited memory are favorable for simple always-on supervision, yet an external low-power transceiver may still dominate the system budget. A robust design would use POR to initialize the state machine, WDT to recover from firmware faults, and hardware gating to prevent unused loads from increasing drain. Do not finalize a battery design until the operating voltage, sleep current, active current, and oscillator requirements are confirmed from the manufacturer datasheet.
Recomendado
Legacy Product Maintenance
MCHRC705J1ACDWE is especially relevant to legacy equipment maintenance, where an existing HC05 board may need a like-for-like replacement without changing its firmware or board layout. The verified data reports an obsolete lifecycle status, so maintenance teams should preserve approved sourcing records, stock sufficient parts, and avoid undocumented substitutions. The target’s 1.2 KB OTP memory and 64-byte RAM make it possible to identify an exact device by its memory architecture, but package ambiguity and missing pin-level data remain important risks. A maintenance replacement should be checked against the original schematic, package markings, programming image, clock circuit, and electrical test limits before installation.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MCHRC705J1ACDWE — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC705J1ACDWE | MC705J1ACDH | MC705J1ACDF | MC705J1ACDWG | MCHC908QT4VDWER |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
Diferenciadores clave
- Resource-constrained HC05 architecture (frente a Larger general-purpose 8-bit MCUs)
- Dedicated legacy-control positioning (frente a MC9S08QE8CTG)
- Potential lifecycle constraint (frente a MC705J1ACDWE related HC05 entry)
Notas de diseño
Do not approve a PCB footprint from the distributor snippets alone. The supplied results conflict between 16-SOIC and 20-SOIC descriptions for MCHRC705J1ACDWE. First confirm the exact orderable MPN, datasheet revision, pin count, pin 1 orientation, exposed-pad status, and package drawing. A footprint mismatch can prevent programming, damage the board during rework, and invalidate a claimed drop-in replacement.
The verified data does not specify the operating-voltage range or current limits. Treat those values as [DATA_NEEDED] until confirmed from the HC05 datasheet. Place the required bypass capacitor close to the supply pins, control power-up sequencing for sensitive peripherals, and use POR behavior to initialize the external circuit. Do not infer a safe rail voltage from the 4 MHz clock rating or package name.
Because the MCU is intended for compact embedded control, preserve a short return path for supply and ground and keep oscillator or programming-related traces away from noisy switching nodes. The supplied data does not identify the oscillator pins or programming interface, so those connections must be taken from the authoritative pinout. Validate footprint geometry, courtyard, solderability, and assembly tolerances during schematic-to-layout review.
OTP program memory is not a general-purpose repeatedly rewritable flash memory. Confirm the programming voltage, timing, security configuration, and irreversible programming process before building a production fixture. Also budget the 1.2 KB memory and 64-byte RAM against the complete firmware, including boot code, interrupts, calibration, and diagnostics; a partial estimate can create a design that compiles but does not fit.
Información de cumplimiento
No verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statement was supplied. Do not infer compliance from distributor availability or package type.
