MC9S08QD2VSC - 8-bit S08 MCU, 2KB Flash, 16MHz, SOIC-8 | NXP
MPN: MC9S08QD2VSC ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.18 | $2.18 |
| 10 | $1.92 | $19.20 |
| 100 | $1.55 | $155.00 |
| 500 | $1.22 | $610.00 |
| 1,000 | $0.98 | $980.00 |
| 3,000 | $0.81 | $2,430.00 |
MC9S08QD2VSC Overview
An 8-bit microcontroller (MCU) is a small, self-contained computing system-on-chip built around an 8-bit central processing unit, integrating program memory, working RAM, I/O peripherals, timers, and analog blocks into a single silicon die. The S08QD family sits at the very bottom of NXP's HCS08 architecture tree (HCS08 -> S08 -> S08QD -> MC9S08QD2), positioned for cost-sensitive embedded control in appliances, white goods, sensor interfaces, and consumer devices. The CPU executes the HC08 instruction set (with the added BGND instruction for background debugging), giving it a broad installed-code base and tool support.
Key features include 2KB of on-chip Flash (1.5KB usable with 0.5KB reserved for EEPROM-like emulation), 256 bytes of RAM, a 4-channel 10-bit analog-to-digital converter, up to 16MHz bus clock, and an asynchronous background debug interface. The device integrates a low-power wait and stop mode with wakeup from interrupts, plus internal pull-ups on selected I/O to reduce external component count. The 8-SOIC footprint keeps board area small for tightly-packed designs.
Technically, the MC9S08QD2VSC builds on the same HCS08 core that powers higher-tier S08 devices, so engineers can move up the family (QD4, SH, QG, AC) for more memory or peripherals without rewriting code. An integrated voltage regulator and brownout detector simplify the analog supply chain, while the internal clock source option removes the need for an external crystal in cost-sensitive applications.
Typical applications include small appliance control, BLDC motor commutation in fans and pumps, sensor conditioning, LED lighting controllers, and battery-powered consumer toys where low BOM cost and small footprint dominate the design. The 4-channel 10-bit ADC handles basic analog sensing without an external converter.
A key design consideration is to plan I/O pin count early: only 6 GPIO pins are exposed on the 8-SOIC package, so designs needing more I/O should consider the larger S08QD4 in TSSOP-16 or migrate to the S08AC family. The internal oscillator is sufficient for most tasks, but timing-critical serial communication may require an external reference.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for MC9S08QD2VSC — 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 MC9S08QD2VSC (same form factor and footprint) — differing in Package, ADC, Flash Memory, RAM, Debug Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S08QD2CSC
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08QD4CSC
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC9S08QD4MSC
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →MC9S08SH4MFK
✅ Drop-In✓ In Stock
$2.15 / Unit
View Datasheet →MC908QT2ACPE
✅ Drop-In✓ In Stock
$0.75 / Unit
View Datasheet →MC9S08QD2VSC Maximum Ratings & Electrical Characteristics
| Core Architecture | HCS08 (enhanced HC08) |
| Program Memory (Flash) | 2 KB (2K x 8) |
| RAM | 256 bytes |
| CPU Clock (max) | 16 MHz |
| Operating Voltage | 2.7 V to 5.5 V |
| ADC | 4-channel, 10-bit |
| GPIO Pins | 6 |
| Package | 8-SOIC (SO-8) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| Operating Temperature | -40 C to +85 C (V suffix = industrial) |
| RoHS Status | Compliant |
| Debug Interface | Background Debug Mode (BDM) |
| Internal Oscillator | Yes (factory trimmed) |
MC9S08QD2VSC Pin Configuration
| Pin 1 | PTA0/TCLK — General-purpose I/O / Timer channel |
| Pin 2 | PTA1 — General-purpose I/O |
| Pin 3 | VDD — Power supply (2.7V to 5.5V) |
| Pin 4 | PTA2 — General-purpose I/O |
| Pin 5 | PTA3 — General-purpose I/O |
| Pin 6 | BKGD/MS — Background Debug Mode / Mode Select |
| Pin 7 | VSS — Ground |
| Pin 8 | PTA4/RESET — General-purpose I/O / Reset |
Typical Applications
MC9S08QD2VSC is suitable for 6 applications: Small Appliance Control, BLDC Fan and Pump Motor Control, Sensor Interface Module, LED Lighting Controller, Battery-Powered Consumer Toy, Industrial Sensor Transmitter.
Small Appliance Control
The MC9S08QD2VSC's 2KB Flash, 256B RAM, and 6 GPIO pins fit small appliance controllers such as coffee makers, toasters, and rice cookers. Its 2.7V to 5.5V operating range covers both 3.3V logic and 5V relay-driver rails, while the 4-channel 10-bit ADC reads thermistor, mains-zero-cross, and user potentiometer inputs without external converters. The internal oscillator eliminates a crystal, reducing BOM cost in high-volume white goods. Place the MCU between the user keypad and the triac/MOSFET driver stage; the BDM interface enables in-circuit firmware updates on the production line.
Recommended
BLDC Fan and Pump Motor Control
In low-cost BLDC fan and pump designs, the MC9S08QD2VSC's 16MHz HCS08 core and 4-channel 10-bit ADC handle back-EMF sensing and basic commutation logic. The 6 GPIO drive the gate-driver enable lines and read Hall-effect or sensorless BEMF comparators. Industrial temperature grade (-40C to +85C) supports under-hood or outdoor pump environments. Place a flyback diode and 10nF ceramic across each motor phase to suppress ESD; the BDM pin allows field firmware updates without removing the motor control board.
Recommended
Sensor Interface Module
The MC9S08QD2VSC acts as a low-cost I2C/SPI-to-UART bridge or sensor-conditioning module, reading analog sensors through its 4-channel 10-bit ADC and forwarding data over SCI. With 256 bytes of RAM it can buffer a few sensor frames before forwarding, suiting low-rate environmental sensors. Operate from 3.3V to 5V single supply; the wide voltage range handles battery packs and regulated industrial rails equally. Add a 100nF decoupling cap adjacent to VDD pin, and route the BDM pin to a 2x5 header for production calibration.
Recommended
LED Lighting Controller
PWM-driven LED controllers for accent, signage, and architectural lighting use the MC9S08QD2VSC's timer channels to generate dimming waveforms while the ADC reads ambient-light sensors or potentiometers. The 6 GPIO are sufficient for two-channel warm-white + cool-white PWM plus a status LED. Industrial temperature grade supports enclosed luminaire environments. Pair with a constant-current LED driver such as NXP's SSL5021; BDM enables last-mile firmware tuning of dimming curves without external programming.
Recommended
Battery-Powered Consumer Toy
Battery-powered toys and personal-care devices use the MC9S08QD2VSC for low-cost motor control, button input, and LED feedback. The wait/stop low-power modes extend coin-cell or 2xAA battery life by dropping current into the microamp range between user events. Operating from 2.7V to 5.5V covers fresh and end-of-life alkaline cells. Connect a 100nF ceramic directly to VDD; use one GPIO to drive a low-side MOSFET for vibration motor PWM, and the ADC for battery-voltage monitoring.
Recommended
Industrial Sensor Transmitter
Loop-powered or 24V industrial sensor transmitters use the MC9S08QD2VSC's wide 2.7V-5.5V supply and 4-channel 10-bit ADC to digitize pressure, temperature, or flow sensors. Industrial -40C to +85C temperature grade supports process-plant environments, while BDM simplifies factory calibration of the ADC transfer function. Place a TVS diode and bulk 10uF cap on VDD for surge immunity. The 2KB Flash holds the linearization lookup table and 4-20mA loop-control state machine.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08QD2VSC — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08QD2CSC | MC9S08QD4CSC | MC9S08QD4MSC | MC9S08SH4MFK | MC908QT2ACPE |
|---|---|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Flash Memory | 2 KB | 2 KB | 4 KB | 4 KB | 4 KB | 1.5 KB |
| RAM | 256 B | 256 B | 256 B | 256 B | 256 B | 128 B |
| CPU Clock (max) | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 3 MHz |
| Core | HCS08 | HCS08 | HCS08 | HCS08 | HCS08 | HC08 |
| Operating Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 3.0 V to 5.5 V |
| Temperature Range (suffix) | -40C to +85C (V industrial) | 0C to +70C (C commercial) | 0C to +70C (C commercial) | 0C to +70C (M suffix) | -40C to +85C (M industrial) | -40C to +85C (A automotive) |
Key Differentiators
- Industrial temperature grade with same SOIC-8 footprint (vs MC9S08QD2CSC)
- 2KB Flash at lower cost than 4KB family member (vs MC9S08QD4MSC)
- Modern HCS08 core vs legacy HC08 (vs MC908QT2ACPE)
- More GPIO than MC908 family entry-level parts (vs MC908QT2ACPE)
Design Notes
Place a 100nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 3) with a short trace to VSS (pin 7). For noisy motor or relay loads, add a 10uF bulk tantalum or aluminum electrolytic capacitor on the supply rail within 25mm of the MCU. The internal voltage regulator requires minimum 2.7V at VDD; below this, Flash programming is inhibited.
Do not leave the BKGD/MS pin (pin 6) floating during normal operation; it must be pulled high through a 4.7k-10k resistor to VDD or the MCU may inadvertently enter background debug mode. The RESET/PTA4 pin (pin 8) needs at least a 10k pull-up if not used as GPIO, otherwise noise may trigger spurious resets.
Use a star-ground topology with VSS at pin 7 as the MCU ground reference. Avoid running high-current motor traces directly under the SOIC-8 footprint; route ADC input traces (PTA0-PTA3) away from switching signals. For the 4-channel ADC to achieve 10-bit accuracy, add a 10nF cap on each analog input pin and limit trace length to under 50mm.
Estimated: at 16MHz CPU clock and 5V supply, the MC9S08QD2VSC draws approximately 10-15mA active, dissipating 50-75mW in the SOIC-8 package. The 8-SOIC theta_JA is roughly 110 C/W, giving a junction temperature rise of 5-8C above ambient - well within the industrial -40C to +85C range. No heatsink is required.
Route the BKGD/MS line to a 2x5 0.05-inch header or test pad for in-circuit programming and debug. Keep the trace under 100mm to avoid signal integrity issues at BDM frequencies. If using the internal oscillator exclusively, you can omit the crystal footprint, saving PCB area and BOM cost in cost-sensitive designs.
Compliance Information
RoHS compliant per NXP product page. Industrial temperature grade; not AEC-Q100 qualified - select AEC-Q100 qualified S08AC/S12Z variants for automotive.
