MC9RS08KA2CPC - 8-bit RS08 MCU, 2KB Flash, DIP-8 | NXP
MPN: MC9RS08KA2CPC ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.53 | $0.53 |
| 10 | $0.48 | $4.80 |
| 100 | $0.42 | $42.00 |
| 500 | $0.36 | $180.00 |
| 1,000 | $0.31 | $310.00 |
MC9RS08KA2CPC Overview
An 8-bit microcontroller (MCU) is a small computer-on-a-chip containing a CPU core, flash program memory, RAM, and peripheral set on a single silicon die. Within the semiconductor taxonomy, the MC9RS08KA2CPC sits in the hierarchy: 8-bit MCU -> RS08 family microcontroller -> Freescale/NXP Kinetis-era low-end MCU -> embedded microcontroller -> integrated circuit. The simplified S08 instruction set adds LDA, STA, and CLR high-performance instructions to support compact code density.
Key features include 2KB flash program memory, 62 bytes RAM, an integrated analog comparator for sensor interfacing, a low-voltage inhibit (LVI) module, power-on reset (POR), and an internal clock source. The 8-pin PDIP package supports through-hole PCB mounting, which simplifies prototyping, breadboarding, and low-volume production without surface-mount reflow equipment. The device also supports background debug mode (BDM) for in-circuit programming and debugging.
The MC9RS08KA2CPC uses the RS08 central processor unit, which is a streamlined variant of the S08 core optimized for low pin-count applications. With the simplified instruction set, deterministic interrupt handling, and low quiescent current, the part targets cost-sensitive applications that require just enough compute to read sensors, drive outputs, and manage simple state machines. The internal oscillator and integrated analog comparator reduce external component count.
Typical applications include consumer appliance controls, lighting controllers, simple sensor interfaces, battery chargers, and white goods. The combination of analog comparator, internal clock, and low pin count suits designs where the MCU is paired with a single analog signal and a few digital outputs.
When designing with this part, note that the DIP-8 package requires through-hole PCB pads and clearance holes, which is unsuitable for high-density SMT boards. For new designs in this performance class, evaluate NXP's S08PT or S08P families, or Microchip's PIC16F or ATtiny families, which offer modern peripherals and active lifecycles.
This page consolidates the verified NXP product information, datasheet links from distributor sources, and pin-compatible drop-in alternatives into a single engineer-ready reference not found in the standalone manufacturer datasheet.
Drop-in alternatives for MC9RS08KA2CPC — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MC9RS08KA2CPC (same form factor and footprint) — differing in RAM Size, Program Memory Size, Mounting Type, Number of I/O Pins, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9RS08KA2CDB
✅ Drop-In✓ In Stock
$1.75 / Unit
View Datasheet →MC9RS08KA1CPC
✅ Drop-In✓ In Stock
$1.1 / Unit
View Datasheet →MC9RS08KA4CPC
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC12F508-I/P
✅ Drop-In✓ In Stock
$0.5 / Unit
View Datasheet →ATTINY25-20PU
✅ Drop-In📋 Reference alternative (not in catalog)
MC9RS08KA2CPC Maximum Ratings & Electrical Characteristics
| Manufacturer | NXP Semiconductors (formerly Freescale) |
| Series | RS08KA |
| Core Processor | RS08 (8-bit) |
| Core Size | 8-bit |
| Program Memory Size | 2 KB (2K x 8) FLASH |
| RAM Size | 62 bytes |
| Maximum Clock Frequency | 20 MHz (10 MHz bus frequency) |
| Data Bus Width | 8 bit |
| Number of I/O Pins | 6 |
| Package | 8-PDIP (DIP-8) |
| Mounting Type | Through Hole |
| Integrated Peripherals | Analog Comparator, LVI, POR, BDM |
| Internal Oscillator | Yes (factory trimmed) |
| Lifecycle Status | Obsolete (per NXP product page EOL notice) |
MC9RS08KA2CPC Pin Configuration
| Pin 1 | RESET/BKGD — Reset input / Background Debug Mode |
| Pin 2 | PTA0/ACMP+ — GPIO / Analog Comparator non-inverting input |
| Pin 3 | PTA1/ACMP- — GPIO / Analog Comparator inverting input |
| Pin 4 | VSS — Ground reference |
| Pin 5 | PTA2 — GPIO / Extal (external clock input option) |
| Pin 6 | PTA3 — GPIO / Xtal (crystal oscillator option) |
| Pin 7 | PTA4 — GPIO / KBI (keyboard interrupt) |
| Pin 8 | VDD — Positive supply input |
Typical Applications
MC9RS08KA2CPC is suitable for 6 applications: Consumer Appliance Control, Lighting Controller Module, Simple Sensor Interface, Battery Charger Controller, White Goods User Interface, Hobby and Education Projects.
Consumer Appliance Control
The MC9RS08KA2CPC suits cost-sensitive consumer appliance controls such as small countertop appliances, coffee makers, and kitchen timers. Its 6 GPIO pins are sufficient to drive indicator LEDs, read keypad inputs, and control a relay or triac via a small gate driver. The integrated analog comparator enables direct sensing of a thermistor or photoresistor without an extra op-amp IC. Running at 20 MHz CPU clock with the simplified RS08 instruction set, the device executes simple state-machine firmware with deterministic latency. The wide 1.8 V to 5.5 V supply range lets the same part run from either a 3 V lithium coin cell or a 5 V regulated supply. The DIP-8 through-hole package simplifies hand-soldered prototypes and field-replaceable modules in low-volume appliance production.
Recommended
Lighting Controller Module
The MC9RS08KA2CPC fits low-cost lighting controllers such as desk lamps with capacitive touch, RGB decorative strips with simple chase patterns, or battery-powered night lights. The integrated analog comparator reads the touch-sensor pad or ambient light sensor directly, removing the need for a dedicated touch IC. The internal factory-trimmed oscillator eliminates the external crystal, reducing BOM cost and board area. With 6 GPIO pins, the MCU can drive three PWM channels for RGB dimming plus a mode-select input. The 2 KB flash holds chase-pattern firmware and small lookup tables; the 62-byte RAM is sufficient for current-state variables only. The DIP-8 form factor makes it easy to swap modules on a service-replaceable PCB.
Recommended
Simple Sensor Interface
The MC9RS08KA2CPC is well suited to simple sensor interface nodes that read one analog threshold and report it digitally. The integrated analog comparator compares a sensor output against an internal reference (or an external DAC from a PWM-filtered GPIO), enabling go/no-go sensor decisions without an external ADC. Examples include liquid-level detectors, over-temperature cutoffs, and optical beam-break alarms. The MCU's 6 GPIOs can drive a status LED, read a pushbutton, and toggle a low-side switch. Wide supply tolerance lets the design run from unregulated battery packs or rectified mains adapters. The DIP-8 package supports hand-repairable field installations where SMT rework equipment is unavailable.
Recommended
Battery Charger Controller
The MC9RS08KA2CPC fits small single-cell NiMH or lithium battery charger controllers where charge termination is detected by temperature or voltage threshold. The integrated analog comparator monitors the battery voltage (divided) against an internal bandgap reference, while a second GPIO reads an NTC thermistor on the battery pack to detect full-charge temperature rise. The MCU toggles a low-side MOSFET to enable/disable charge current. The 1.8 V to 5.5 V supply range lets the part run directly from a single Li-ion cell without a regulator. Low quiescent current when idle extends shelf life of packaged chargers. DIP-8 supports through-hole layouts preferred for hobby and replacement-market charger modules.
Recommended
White Goods User Interface
The MC9RS08KA2CPC targets white goods user interface boards that read a small keypad and drive a 7-segment or character LCD. With 6 GPIOs, the MCU can scan up to a 3x3 matrix keypad using software multiplexing, while two additional lines handle LED indicators. For basic 7-segment drive, software multiplexing reduces the pin count to seven GPIO-controlled segments plus one digit enable. The integrated analog comparator can read a potentiometer for variable settings. The simplified RS08 instruction set and small RAM footprint are sufficient for debounce state machines and pattern lookup tables. DIP-8 supports through-hole assembly used in many existing white-goods service-replaceable UI boards.
Recommended
Hobby and Education Projects
The MC9RS08KA2CPC suits hobby and education projects, including Arduino-alternative beginner kits, blinking-LED tutorials, and microcontroller coursework. The DIP-8 form factor drops into standard 8-pin IC sockets on breadboards and perfboards without surface-mount soldering, which is ideal for classroom and home-lab environments. The simplified RS08 instruction set allows students to study low-level register manipulation. The integrated analog comparator enables simple experiments such as light-dark sensors, motor-stall detectors, and audio-level meters. The 2 KB flash is enough for several textbook examples. BDM programming via the RESET/BKGD pin supports in-circuit debugging with NXP USBDM tools, giving students hands-on debug experience.
Recommended
Recommended Products Summary
Engineering reference data for MC9RS08KA2CPC — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9RS08KA2CDB | MC9RS08KA1CPC | MC9RS08KA4CPC | PIC12F508-I/P | ATTINY25-20PU |
|---|---|---|---|---|---|---|
| Package | 8-PDIP (DIP-8) | 8-TSSOP (different footprint) | 8-PDIP (same) | 8-PDIP (same) | 8-PDIP (same) | 8-PDIP (same) |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Microchip Technology | Microchip Technology |
| Core | RS08 (8-bit) | RS08 (8-bit) | RS08 (8-bit) | RS08 (8-bit) | PIC (8-bit RISC) | AVR (8-bit RISC) |
| Flash Memory | 2 KB | 2 KB | 1 KB | 4 KB | 512 B | 2 KB |
| RAM | 62 bytes | 62 bytes | 62 bytes | 126 bytes | 25 bytes | 128 bytes |
| Max CPU Clock | 20 MHz (10 MHz bus) | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 20 MHz |
| Integrated Analog Comparator | Yes | Yes | Yes | Yes | No | Yes |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Active | Active |
| Supply Voltage Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 2.0 V to 5.5 V | 1.8 V to 5.5 V |
Key Differentiators
- Integrated analog comparator reduces BOM count (vs PIC12F508-I/P)
- 2 KB flash at 20 MHz CPU clock (vs PIC12F508-I/P)
- Wide 1.8 V to 5.5 V supply range (vs PIC12F508-I/P)
- Through-hole DIP-8 simplifies prototyping (vs MC9RS08KA2CDB (TSSOP-8))
Design Notes
The DIP-8 outline requires 0.1 inch (2.54 mm) pitch through-hole pads and 0.8 mm drill holes. Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 8), with the ground return tied to pin 4 VSS. Keep the RESET/BKGD trace short; long traces pick up noise and may trigger spurious resets during BDM programming.
Do not confuse the MC9RS08KA2CPC (PDIP-8) with the MC9RS08KA2CDB (TSSOP-8) variant - the part numbers share the same silicon but use different footprints. The two packages are not drop-in on the same PCB. Also note: pin 1 is RESET/BKGD, not a GPIO; do not drive it low at power-up or the MCU stays in reset. The integrated analog comparator requires firmware configuration of the ACMP control register before use.
Estimated: with all 6 GPIOs sourcing 10 mA each at 3.3 V, total I/O current draw is ~60 mA plus MCU core consumption. At full 20 MHz CPU clock, core current draw is roughly 5-7 mA per the RS08KA datasheet. For battery-powered designs, gate the peripheral supply to extend standby time. Always place a bulk capacitor (10 uF or larger) within 1 cm of the VDD pin.
Keep analog comparator input traces (PTA0/ACMP+, PTA1/ACMP-) short and guarded by a ground trace to minimize digital switching noise coupling into the analog comparator decision threshold. If using the internal oscillator, route PTA2/PTA3 away from high-frequency digital traces to reduce jitter on the analog comparator reference.
Compliance Information
RoHS, REACH, lead-free, and halogen-free status not explicitly stated in the verified web data. Confirm against the NXP product page environmental information section before use in regulated end products. AEC-Q100 is not applicable - the part targets consumer/industrial segments, not automotive.
