MC9S08PA8VLC - 8-bit S08 MCU 8KB Flash 32-LQFP | NXP
MPN: MC9S08PA8VLC ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.93 | $2.93 |
| 10 | $2.65 | $26.50 |
| 100 | $2.31 | $231.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.84 | $1,840.00 |
MC9S08PA8VLC Overview
An 8-bit MCU is a microcontroller whose central processing unit performs arithmetic and logic on 8-bit data words, sufficient for simple control loops, user-interface logic, sensor reading, and actuator driving without the software overhead of a 32-bit core. The MC9S08PA8VLC belongs to the broader category of microcontrollers -> embedded processors -> semiconductor ICs, placing it squarely in the lowest tier of complexity but with the smallest bill of materials for typical appliance, lighting, and motor-control nodes.
Key features include 8KB on-chip Flash, 2KB SRAM, an integrated 12-bit SAR ADC with up to 16 channels, an analog comparator, hardware timers including a FlexTimer for motor control, EEPROM, an 8-bit keyboard interrupt module, and a touch-sensing interface (TSI). The S08 core uses a HCS08 instruction set with background debug mode, enabling in-circuit programming and on-chip debug through a single-wire BDM interface. The 32-pin LQFP and a 20 MHz clock allow the device to replace legacy HC08 designs with negligible code porting effort.
Typical applications include BLDC ceiling-fan motor control, washing-machine control boards, induction cooktops, low-end smoke detectors, and simple sensor hubs. The integrated FlexTimer and analog comparator make it well suited for low-cost variable-frequency drive and hardware-protect functions. A typical design uses the ADC for current sensing and the comparator for over-current hardware shutdown.
Design tradeoffs include limited code space (8KB Flash) and absence of USB or CAN, which restrict use in connected designs; for those, choose the larger S08AC or Kinetis E series. When laying out the PCB, keep the decoupling capacitor within 5 mm of the VDD pin to meet in-circuit noise requirements during ADC conversions. XAIPART synthesizes distributor pricing, drop-in alternatives, and design notes not always captured in the manufacturer datasheet, including the lifecycle status shown on NXP's product page.
Drop-in alternatives for MC9S08PA8VLC — 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 MC9S08PA8VLC (same form factor and footprint) — differing in Package, ADC, Core, Program Memory (Flash), Lifecycle Status.
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MC9S08PA16VLC
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View Datasheet →MC9S08PA32VLC
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MC9S08PT16AVWJ
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View Datasheet →MC9S08DV48AMLH
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View Datasheet →MCF51MM128VLK
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View Datasheet →PIC16F877A-I/P
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View Datasheet →MC9S08PA8VLC Maximum Ratings & Electrical Characteristics
| Core | HCS08 (S08 CISC) |
| Data Bus Width | 8 bit |
| Program Memory (Flash) | 8 KB |
| RAM | 256 B |
| EEPROM | Yes (on-chip) |
| Maximum Clock Frequency | 20 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Package | 32-pin LQFP (7 mm x 7 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +105 C |
| ADC | 12-bit SAR |
| MSL Level | 3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Debug Interface | Background Debug Mode (BDM) |
| Touch Sensing Interface (TSI) | Yes |
| Analog Comparator | Yes |
| Lifecycle Status | NRND (Not Recommended for New Designs) |
MC9S08PA8VLC Pin Configuration
| Pin 1 | PTB5 — Port B bit 5 / peripheral function |
| Pin 2 | PTB4 — Port B bit 4 / peripheral function |
| Pin 3 | PTB3 — Port B bit 3 / peripheral function |
| Pin 4 | PTB2 — Port B bit 2 / peripheral function |
| Pin 5 | PTB1 — Port B bit 1 / peripheral function |
| Pin 6 | PTB0 — Port B bit 0 / peripheral function |
| Pin 7 | PTA7 — Port A bit 7 / peripheral function |
| Pin 8 | PTA6 — Port A bit 6 / peripheral function |
| Pin 9 | PTA5 — Port A bit 5 / peripheral function |
| Pin 10 | PTA4 — Port A bit 4 / peripheral function |
| Pin 11 | PTA3 — Port A bit 3 / peripheral function |
| Pin 12 | PTA2 — Port A bit 2 / peripheral function |
| Pin 13 | PTA1 — Port A bit 1 / peripheral function |
| Pin 14 | PTA0 — Port A bit 0 / peripheral function |
| Pin 15 | VDD — Power supply (2.7 V to 5.5 V) |
| Pin 16 | VSS — Ground |
| Pin 17 | PTC7 — Port C bit 7 / peripheral function |
| Pin 18 | PTC6 — Port C bit 6 / peripheral function |
| Pin 19 | PTC5 — Port C bit 5 / peripheral function |
| Pin 20 | PTC4 — Port C bit 4 / peripheral function |
| Pin 21 | PTC3 — Port C bit 3 / peripheral function |
| Pin 22 | PTC2 — Port C bit 2 / peripheral function |
| Pin 23 | PTC1 — Port C bit 1 / peripheral function |
| Pin 24 | PTC0 — Port C bit 0 / peripheral function |
| Pin 25 | PTD7 — Port D bit 7 / peripheral function |
| Pin 26 | PTD6 — Port D bit 6 / peripheral function |
| Pin 27 | PTD5 — Port D bit 5 / peripheral function |
| Pin 28 | PTD4 — Port D bit 4 / peripheral function |
| Pin 29 | PTD3 — Port D bit 3 / peripheral function |
| Pin 30 | PTD2 — Port D bit 2 / peripheral function |
| Pin 31 | BKGD — Background Debug Mode |
| Pin 32 | RESET — External reset input (active low) |
Typical Applications
MC9S08PA8VLC is suitable for 6 applications: BLDC Ceiling Fan Motor Control, Washing Machine Control Board, Induction Cooktop User Interface, Low-End Smoke Detector Node, Sensor Hub for Home Appliances, Touch-Key Replacement for Mechanical Buttons.
BLDC Ceiling Fan Motor Control
The MC9S08PA8VLC's 20 MHz 8-bit HCS08 core and 12-bit ADC directly support sensorless BLDC ceiling-fan motor control. The 8 KB Flash fits a typical motor-control state machine with FOC-free trapezoidal commutation, while the integrated analog comparator provides hardware over-current shutdown to protect the gate driver. Designers use the 6-channel FlexTimer to drive a 3-phase half-bridge via an external NXP FAN7388 or FAN8100 gate driver; PWM at 20 kHz is comfortably within the 50 ns timer resolution of the HCS08 core. The 2.7 V to 5.5 V supply range accepts both 3.3 V and 5 V MCU rails, removing the need for an extra LDO. Compared with a 32-bit Cortex-M0 alternative, this part lowers BOM cost by approximately 30 percent while keeping firmware tight for fan-only applications.
Recommended
Washing Machine Control Board
Washing-machine main controllers mix motor drive, water-level sensing, and user-key input - all tasks well-matched to the MC9S08PA8VLC. The 12-bit ADC reads water-level pressure transducers and motor current, while the TSI module replaces mechanical pushbuttons with capacitive-touch keys. The internal 256-byte RAM is sufficient for a small RTOS or simple state machine, and 8 KB Flash holds the wash-cycle state table. The integrated EEPROM aids non-volatile user presets. Designers should keep the decoupling capacitor within 5 mm of VDD to meet in-circuit noise requirements during heavy motor switching events. The wide 2.7 V-5.5 V supply range survives 5 V system rails directly.
Recommended
Induction Cooktop User Interface
Induction cooktops need a low-cost controller that handles capacitive touch keys, safety interlocks, and LCD/LED user displays without driving the induction coil directly. The MC9S08PA8VLC serves as the HMI/control MCU, using TSI for capacitive touchpads and the analog comparator for hardware pan-detection. Its 8 KB Flash covers the menu logic, and the 2.7 V-5.5 V supply makes it tolerant of rectified 5 V rails typical of AC-DC SMPS used in cooktops. The 20 MHz core handles 7-segment display refresh and PWM drive of indicator LEDs without overhead. Pin-external MCU modules manage actual coil commutation; the PA8 is purely UI/safety logic. XAIPART pins the part's lifecycle status as NRND for new designs, guiding new cooktop projects toward MC9S08PL series.
Recommended
Low-End Smoke Detector Node
The MC9S08PA8VLC is widely used in low-cost photoelectric smoke detectors. Its onboard analog comparator enables low-noise threshold detection of the IR photodiode signal, while the 12-bit ADC handles chamber calibration. At deep-sleep currents around 1.5 uA per the S08PA datasheet, the part is well matched to battery-powered smoke-detector budget, supporting multi-year battery life on a 9 V cell. The 20 MHz core ensures the supervisory loop runs with a margin against chamber-drift timeouts. With 8 KB Flash and integrated EEPROM, the detector can store calibration constants and intermittent fault logs. XAIPART highlights the NRND status for new designs; smoke-detector projects should plan migration to Kinetis E or S08PL parts.
Recommended
Sensor Hub for Home Appliances
The MC9S08PA8VLC is widely deployed as a low-power sensor hub for HVAC and refrigerator peripherals, reading temperature, humidity, and door-state signals. The 12-bit ADC with up to 16 channels multiplexes multiple thermistor inputs, while on-chip EEPROM stores offset calibration. The 20 MHz core orchestrates the I2C/SPI bus for external sensor front-ends and the UART for the main appliance MCU. The 2.7 V to 5.5 V supply directly taps the appliance 5 V stand-by rail without a regulator. The 8 KB Flash holds the sensor polling table and averaging filters for typical environmental sensing use cases. With low deep-sleep current, the part suits always-on monitoring roles inside appliances.
Recommended
Touch-Key Replacement for Mechanical Buttons
Replacing mechanical buttons with capacitive-touch keys in white goods and consumer electronics is a common reason designers reach for the MC9S08PA8VLC. The TSI module handles up to 16 capacitive electrodes without external hardware, and the S08 firmware ties actions (start/stop/cancel) into the existing appliance UI. With 8 KB Flash and 256 B RAM, the part is well suited for a touch-key slave MCU that interfaces to the main controller over UART or I2C. The 32-pin LQFP body is small enough to drop into space-constrained control panels, and the 2.7 V-5.5 V supply keeps the touch-key MCU on the same 5 V stand-by rail. Designers will appreciate BDM single-wire debug for live tuning of touch thresholds.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08PA8VLC — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08PA16VLC | MC9S08PA32VLC | MC9S08PT16AVWJ | MC9S08DV48AMLH | MCF51MM128VLK |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 32-pin LQFP (VLC) 7x7 mm | 32-pin LQFP (VLC) 7x7 mm - same footprint | 32-pin LQFP (VLC) 7x7 mm - same footprint | LQFP class (verify exact body) | 32-LQFP class (verify exact body) | LQFP class (verify exact body) |
| Core | HCS08 (8-bit) | HCS08 (8-bit) - same | HCS08 (8-bit) - same | HCS08 (8-bit) - same family | HCS08 (8-bit) - same family | ColdFire V1 (32-bit) - different |
| Maximum Clock Frequency | 20 MHz | 20 MHz - same | 20 MHz - same | 20 MHz - same | 20 MHz - same | Up to 50 MHz - faster |
| Program Memory (Flash) | 8 KB | 16 KB | 32 KB | 16 KB | 48 KB | 128 KB |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V - same | 2.7 V to 5.5 V - same | 2.7 V to 5.5 V - same | 2.7 V to 5.5 V - same | 1.8 V to 3.6 V - different |
| Lifecycle Status | NRND | NRND | Active | Active | NRND | NRND |
| Drop-in Replacement Verdict | This product | Yes - same LQFP-32 VLC footprint | Yes - same LQFP-32 VLC footprint | Yes - LQFP class, verify pinout | Yes - LQFP class, verify pinout | Same LQFP class, 32-bit migration only |
Key Differentiators
- Code headroom upgrade path within same LQFP-32 (vs MC9S08PA8VLC -> MC9S08PA16VLC)
- Higher code headroom in the same LQFP-32 footprint (vs MC9S08PA8VLC -> MC9S08PA32VLC)
- Larger Flash and CAN option in same family (vs MC9S08PA8VLC -> MC9S08DV48AMLH)
- 32-bit ColdFire upgrade for richer firmware (vs MC9S08PA8VLC -> MCF51MM128VLK)
Design Notes
The MC9S08PA8VLC requires a single VDD supply between 2.7 V and 5.5 V with a 0.1 uF ceramic decoupling capacitor placed within 5 mm of the VDD pin (per S08PA datasheet). For designs with heavy motor-driver switching nearby, add a bulk 10 uF tantalum or ceramic cap on the same node to handle motor in-rush transients. The VSS pin is the single ground return; star-ground it at the MCU to prevent digital switching currents from corrupting analog sensing through the 12-bit ADC. A ferrite bead plus 10 uF cap on VDD is recommended when the input rail shares with the gate driver.
Route the BDM (BKGD) and RESET traces first; both must be pulled up to VDD via 10 kohm resistors and pulled low on reset assertion. Do not place a series resistor on BKGD if you also want fast in-circuit programming - the BDM driver has its own slew control. Place the 32.768 kHz crystal load caps close to the XTAL pins if used; otherwise tie XTAL to ground through a 100 kohm resistor per the S08PA datasheet. Keep ADC reference traces short; the ADC VREFH is internally tied to VDD on the LQFP-32 device, so any VDD noise couples straight into ADC results - a small RC filter is recommended.
Estimated: the S08PA family Flash row size of 64 B can surprise code developers expecting 128 B segments; erasure granularity also affects EEPROM emulation. Designers new to the HCS08 instruction set should note that the indexed addressing modes differ from the legacy HC08 in subtle ways - run the S08PA reference manual examples. Do not assume PA family pinouts match PB/PC - the LQFP-32 VLC pinout has been reused across families, but PCB reuse requires careful cross-check against the active mechanical drawing. Finally, NXP's product page marks this MPN as NRND; production designs must validate the lifecycle status through your distributor before commitment.
Compliance Information
RoHS and lead-free per NXP product page. Not AEC-Q100 qualified - automotive users should pick S9S08PT16 or qualified Kinetis KE parts. Lifecycle is NRND per the NXP product page; new designs should migrate to MC9S08PA32VLC or the Kinetis E family.
