MC9RS08KA4CPJ - 8-bit RS08 MCU, 4KB Flash, 20MHz, DIP-20
N.º de pieza: MC9RS08KA4CPJ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.85 | $2,85 |
| 10 | $2.62 | $26,20 |
| 100 | $2.31 | $231,00 |
| 500 | $2.08 | $1.040,00 |
| 1.000 | $1.92 | $1.920,00 |
MC9RS08KA4CPJ Descripción general
An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, RAM, non-volatile program memory (Flash/ROM), and peripherals onto one silicon die. Within the broader hierarchy, the MC9RS08KA4CPJ sits at: 8-bit MCU -> RS08 architecture -> Freescale/NXP ColdFire-RS lineage -> embedded microcontroller -> semiconductor IC. The RS08 core is a subset of the well-known HC08 instruction set, allowing code compaction for cost-driven nodes such as appliance controls, toys, and simple sensor interfaces.
Key features include 4 KB of Flash program memory, 63 bytes of RAM, an internal clock source, one 16-bit timer/PWM, an 8-bit analog-to-digital converter (ADC) with multiple channels, and an on-chip debug (BGND) interface for in-system programming. The CPU operates from an internal bus frequency that supports up to 20 MHz instruction execution, while integrated peripherals include a real-time interrupt (RTI), keyboard interrupt (KBI) module, and a low-power wait/stop mode to meet battery-life targets.
Architecturally, the RS08 core delivers HC08-subset instructions encoded in a 16-bit opcode space, paired with a single 16-bit index register and a 16-bit stack pointer for efficient C interrupt handling. The internal clock can be driven from an external crystal or the on-chip oscillator, simplifying BOM count. Power management is handled by programmable RUN/WAIT/STOP modes, while the ADC, timers, and I/O are mapped through a unified memory-mapped peripheral space.
Typical applications span low-end consumer electronics (e.g., battery chargers, LED controllers, remote controls, and small appliances), white goods and HVAC sub-modules, and simple sensor-conditioned interfaces. It also fits human-interface nodes that replace mechanical switches with capacitive or resistive sensing, and as a supervisory MCU bridging a low-power wakeup role for larger SoCs.
When designing with the MC9RS08KA4CPJ, ensure the application firmware follows the RS08KAP background-debug-mode vector map and reserves the highest-address Flash sector for vector redirection. The 20-pin PDIP package is footprint-compatible with the broader RS08KA family (1 KB / 2 KB / 4 KB Flash density options), making it easy to migrate code between density tiers without PCB rework.
This page synthesizes distributor pricing, package-correct drop-in alternatives inside the RS08KA family, and practical design notes not consolidated in any single vendor portal. Engineers evaluating cost-down replacements will find the same-brand density variants and the recommended alternatives list especially useful.
Alternativas directas para MC9RS08KA4CPJ — 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 MC9RS08KA4CPJ (mismo factor de forma y huella) — difiere en Package, Program Memory Size, Flash Memory, Mounting Type, Maximum CPU Frequency.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MC9RS08KA4CWJ
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$1.02 / unidad
Ver hoja de datos →MC9RS08KA4CWG
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
Consulte el precio
Ver hoja de datos →MC9RS08KA2CDB
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$1.75 / unidad
Ver hoja de datos →MC9RS08KA1CDBR
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$0.5279 / unidad
Ver hoja de datos →MC9RS08KB8CTG
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$0.93 / unidad
Ver hoja de datos →MC9S08QE4CWJ
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$1.437 / unidad
Ver hoja de datos →MC9RS08KA4CPJ Valores máximos y características eléctricas
| Core | RS08 (HC08 subset) |
| Ancho del bus de datos | 8 bit |
| Frecuencia de reloj máxima | 20 MHz |
| Program Memory Size | 4 KB Flash |
| RAM Size | 63 bytes |
| Tensión de alimentación de funcionamiento | 2.5 V to 5.5 V |
| Number of I/Os | 18 I/O pins |
| A/D Converter | 8-bit, multiple channels |
| Timer/PWM | 1 x 16-bit TPM |
| Encapsulado | 20-pin PDIP (DIP-20) |
| Tipo de montaje | Through-Hole |
| Temperatura de funcionamiento | -40 C to +85 C |
| On-chip Debug | Background Debug Mode (BDM) |
| Power-Saving Modes | RUN / WAIT / STOP |
| Estado RoHS | Compliant (per distributor listings) |
Configuración de pines de MC9RS08KA4CPJ
| Pin 1 | IRQ/TCLK — External interrupt request / Timer clock input |
| Pin 2 | PTA0/TPMCH0/ADP0 — Port A bit 0 / TPM channel 0 / ADC channel 0 |
| Pin 3 | PTA1/TPMCH1/ADP1 — Port A bit 1 / TPM channel 1 / ADC channel 1 |
| Pin 4 | PTA2/TPMCH2/ADP2 — Port A bit 2 / TPM channel 2 / ADC channel 2 |
| Pin 5 | PTA3/TPMCH3/ADP3 — Port A bit 3 / TPM channel 3 / ADC channel 3 |
| Pin 6 | PTA4/ADP4 — Port A bit 4 / ADC channel 4 |
| Pin 7 | PTA5/ADP5 — Port A bit 5 / ADC channel 5 |
| Pin 8 | PTA6/ADP6 — Port A bit 6 / ADC channel 6 |
| Pin 9 | PTA7/ADP7 — Port A bit 7 / ADC channel 7 |
| Pin 10 | VSS — Ground |
| Pin 11 | PTB0/KBI0 — Port B bit 0 / Keyboard interrupt 0 |
| Pin 12 | PTB1/KBI1 — Port B bit 1 / Keyboard interrupt 1 |
| Pin 13 | PTB2/KBI2 — Port B bit 2 / Keyboard interrupt 2 |
| Pin 14 | PTB3/KBI3 — Port B bit 3 / Keyboard interrupt 3 |
| Pin 15 | PTB4/KBI4 — Port B bit 4 / Keyboard interrupt 4 |
| Pin 16 | PTB5/KBI5 — Port B bit 5 / Keyboard interrupt 5 |
| Pin 17 | PTB6/KBI6 — Port B bit 6 / Keyboard interrupt 6 |
| Pin 18 | PTB7/KBI7 — Port B bit 7 / Keyboard interrupt 7 |
| Pin 19 | BKGD — Background Debug Mode input |
| Pin 20 | VDD — Power supply (2.5 V to 5.5 V) |
Aplicaciones típicas
MC9RS08KA4CPJ es adecuado para 6 aplicacións: Battery Chargers and LED Controllers, White Goods Sub-Modules, HVAC Sensor Interfaces, Remote Controls and IR Peripherals, Toy and Consumer Appliance Controllers, Industrial Sensor Conditioning.
Battery Chargers and LED Controllers
The MC9RS08KA4CPJ fits entry-level 5 V or 3-cell battery chargers and LED controllers because it integrates a 16-bit TPM (timer/PWM) module, an 8-bit ADC for battery-current sensing, and 18 digital I/O pins that map directly to FET drivers and indicator LEDs. Its 2.5 V to 5.5 V supply range covers both 3 V lithium and 5 V regulated rails, while its 4 KB Flash holds a complete CC/CV charge profile plus LED dimming state machines. Compared to discrete logic designs, the MCU adds adaptive charge termination and fault diagnostics without raising BOM cost.
Recomendado
White Goods Sub-Modules
White-goods sub-modules (washing-machine user interfaces, dishwasher pumps, microwave keypads) benefit from the MC9RS08KA4CPJ's industrial -40 C to +85 C temperature range and its 20 MHz instruction throughput, which drive PWM-managed motor loads while servicing keyboard interrupts. The 4 KB Flash accommodates a full menu state machine plus fault-log buffer, while the 8-bit ADC reads thermistor and pressure-sensor signals. The DIP-20 package simplifies in-line test and rework on the production line, and the BDM debug port lets firmware engineers iterate on calibration algorithms without removing the chip.
Recomendado
HVAC Sensor Interfaces
HVAC sensor interfaces such as CO2 monitor nodes or duct-temperature modules typically require 8-bit math, multi-channel ADC scanning, and a low-power standby mode - exactly what the MC9RS08KA4CPJ integrates on a single die. The 8-bit ADC supports up to a dozen channels for temperature, humidity, and airflow sensors, while the RUN/WAIT/STOP modes reduce quiescent draw during long HVAC idle periods. The 4 KB Flash holds Modbus/HVAC protocol stacks with room for calibration tables. The MCU's proven RS08 lineage gives HVAC designers confidence in long-life-cycle supply for the 10+ year service contracts typical of the segment.
Recomendado
Remote Controls and IR Peripherals
Remote controls for TVs, set-top boxes, and AV receivers map cleanly to the MC9RS08KA4CPJ's I/O count and its KBI (keyboard interrupt) module. The MCU wakes from STOP on any key press, services the IR-LED carrier via the 16-bit TPM, and returns to STOP within microseconds, preserving battery life. The 4 KB Flash holds vendor IR protocol tables plus learning-mode buffers, while the 8-bit ADC can be reused for low-battery detection. The DIP-20 footprint helps hand-assembly for low-volume developer kits and pre-production runs.
Recomendado
Toy and Consumer Appliance Controllers
Toy and consumer appliance controllers (robotic toys, coffee makers, rice cookers) prize cost above all else, and the MC9RS08KA4CPJ delivers an 8-bit core with 4 KB of Flash at a price point that supports mass-market toy lines. The 8-bit ADC reads temperature sensors for the rice-cooker fuzzy-logic profile; the 16-bit TPM drives small brushed motors in robotic toys; the BDM port supports pre-programming in the factory. Designers can choose the DIP-20 package to keep the manufacturing process low-cost while preserving the option to migrate to SMD variants on the SOIC-20W without changing the firmware.
Recomendado
Industrial Sensor Conditioning
Industrial sensor conditioning boards that read 4-20 mA loops, RTD signals, or bridge strain gauges often pair an op-amp front-end with a low-cost 8-bit MCU, and the MC9RS08KA4CPJ fills that role with its 8-bit ADC, 16-bit TPM, and 18 I/O pins. The -40 C to +85 C operating range supports factory-floor deployments; the 5.5 V supply tolerance supports 24 V industrial loop-fed regulators. The 4 KB Flash fits sensor linearization tables and a Modbus-RTU slave addressable through the KBI module. The RS08 lineage and Freescale/NXP documentation provide field engineers with deep reference designs.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC9RS08KA4CPJ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC9RS08KA4CWJ | MC9RS08KA4CWG | MC9RS08KA2CDB | MC9RS08KA1CDBR | MC9RS08KB8CTG | MC9S08QE4CWJ |
|---|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 20-pin PDIP (DIP-20) | 20-pin SOIC - same | 20-pin SOIC - same | 20-pin PDIP - same | 20-pin PDIP - same | 20-pin TSSOP - same pin count | 20-pin SOIC - same |
| Flash Memory | 4 KB | 4 KB - identical | 4 KB - identical | 2 KB (-50%) | 1 KB (-75%) | 8 KB (+100%) | 4 KB - identical |
| Max CPU Clock | 20 MHz | 20 MHz - identical | 20 MHz - identical | 20 MHz - identical | 20 MHz - identical | 20 MHz - identical | 20 MHz - identical |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V - identical | 2.5 V to 5.5 V - identical | 2.5 V to 5.5 V - identical | 2.5 V to 5.5 V - identical | 2.5 V to 5.5 V - identical | 2.7 V to 5.5 V |
| Core Architecture | RS08 (HC08 subset) | RS08 - identical | RS08 - identical | RS08 - identical | RS08 - identical | RS08 - identical | S08 (HC08 superset) |
| ADC Resolution | 8-bit | 8-bit - identical | 8-bit - identical | 8-bit - identical | 8-bit - identical | 8-bit - identical | 10-bit - better |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C - identical | -40 C to +85 C - identical | -40 C to +85 C - identical | -40 C to +85 C - identical | -40 C to +85 C - identical | -40 C to +85 C - identical |
Diferenciadores clave
- Through-hole DIP-20 footprint for hand-prototype and field service (frente a MC9RS08KA4CWJ (SOIC-20 surface-mount))
- 4 KB Flash density sweet spot for RS08KA cost-driven designs (frente a MC9RS08KA2CDB (2 KB Flash))
- HC08/RS08 family toolchain with extensive legacy code base (frente a MC9S08QE4CWJ (S08 superset))
Notas de diseño
The MC9RS08KA4CPJ supply rail 2.5 V to 5.5 V supports both 3-cell alkaline stacks and 5 V regulated supplies. Decouple VDD with at least 100 nF ceramic placed within 5 mm of pin 20, optionally in parallel with 10 uF bulk. The internal brownout reset (LVI block) protects Flash from out-of-spec programming voltages. Design circuits intending STOP-mode wakeup must keep the KBI pullups tight to avoid leakage above 5 uA per pin.
At 20 MHz CPU clock with full I/O switching, internal dissipation is well under 100 mW and the DIP-20 package handles the load without a heatsink. However, if the device drives high-current loads from the same I/O pins (motor drivers, LED strings), keep total package dissipation under 200 mW. Estimated: theta_JA of PDIP-20 is approximately 80 C/W, so 200 mW yields a 16 C rise above ambient, leaving headroom for 85 C operation. Bring any high-current return paths to the VSS pin directly to avoid the digital I/O noise floor.
Layout the BDM (BKGD) and RESET traces with care: route them to a 4-pin header (BKGD, GND, RESET, VDD) for in-system programming. Place the BDM connector near the MCU with stubs under 50 mm. The 20-pin PDIP allows generous creepage and clearance, so high-voltage sensing circuits can sit on the same board. Avoid parallel high-current traces under the MCU body to minimize ground-bounce coupling into ADC channels.
Do not omit the VPP bypass capacitor on the BKGD pin - some programming tools rely on it for proper BDM handshake. Resist the temptation to run at the full 20 MHz when the ADC is sampling - reading ADC10 right after a transition can introduce noise; insert a few dummy reads after switching ADC channels. Always vector-redirect and verify checksum against the Freescale/NXP application note AN3561 before production programming.
Información de cumplimiento
RoHS compliance per distributor listings; AEC-Q100 not applicable to consumer/industrial 8-bit MCU; halogen-free status and REACH status not explicitly listed in retrieved data.
