MC9S08QD4MSC - 8-bit S08 MCU 16MHz 4KB Flash | NXP
MPN: MC9S08QD4MSC ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.98 | $1.98 |
| 10 | $1.78 | $17.80 |
| 100 | $1.52 | $152.00 |
| 500 | $1.35 | $675.00 |
| 1,000 | $1.18 | $1,180.00 |
MC9S08QD4MSC Overview
An 8-bit microcontroller (MCU) is a single-chip computing device that integrates a processor core, memory, and peripherals on one die. Within the system hierarchy, the S08QD family sits below larger S08, S12 (HCS12) and 32-bit families in the NXP portfolio, offering minimal pin count and minimal BOM cost for basic control tasks where a full-featured MCU is unnecessary.
Key features include the enhanced HCS08 CISC CPU operating at up to 16 MHz, 4 KB of in-system-programmable FLASH, a 4-channel 10-bit ADC, and 6 general-purpose I/O pins. Background debug communication remains possible in STOP mode when ENBDM is set, enabling non-intrusive debugging through the single-wire background debug interface without consuming on-chip resources.
Architecturally, the MC9S08QD4 shares the S08 core used across the broader QD family (QD2 and QD4 variants), which means code developed for the QD2 scales upward to the QD4 with more FLASH. The internal oscillator options and low pin count reduce external component count, and the ADC supports basic analog measurement such as temperature, voltage, or trim-pot sensing in compact products.
Typical applications include small appliance control, simple battery-charger supervision, low-end automotive and industrial auxiliary functions, and replacement of discrete logic with a programmable device. The 8-pin SOIC fits space-constrained and cost-reduced PCB layouts.
Design consideration: this part is officially listed by NXP as End of Life, so new designs should plan a migration path or secure last-time-buy inventory; NXP indicates automotive-specific variants of the QD series use part numbers starting with "S" (e.g., S9S08QD4).
This page synthesizes distributor availability data, drop-in family alternatives, and EOL cross-reference guidance not consolidated in the manufacturer datasheet.
Drop-in alternatives for MC9S08QD4MSC — 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 MC9S08QD4MSC (same form factor and footprint) — differing in Debug Interface, Package, RAM, Core Architecture, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S08QD4CSC
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →S9S08QD4J1CSCR
✅ Drop-In✓ In Stock
$4.42 / Unit
View Datasheet →S9S08QD4J1MSCR
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08QD2MSC
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08QD4MSC Maximum Ratings & Electrical Characteristics
| Core | S08 (HCS08), 8-bit |
| Core Architecture | CISC, enhanced HCS08 |
| Maximum CPU Frequency | 16 MHz |
| Flash Memory | 4 KB (4K x 8) |
| RAM | 256 B (0.256 KB) |
| ADC | 4-channel, 10-bit |
| Number of I/Os | 6 |
| Package | 8-SOIC |
| Mounting Type | Surface Mount |
| Series | S08QD (9S08QD4 series) |
| Debug Interface | Single-wire background debug (BDM active in STOP when ENBDM set) |
| Lifecycle Status | End of Life (per NXP product page) |
MC9S08QD4MSC 8-soic Pin Configuration Guide
Pin configuration for MC9S08QD4MSC (8-soic package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for MC9S08QD4MSC.
Refer to the datasheet for full pin configuration.
Typical Applications
MC9S08QD4MSC is suitable for 6 applications: Small Appliance Control, Battery Charger Supervision, Automotive Auxiliary Functions, Industrial Discrete Logic Replacement, IoT Sensor Node Front-End, Educational and Prototype Embedded Projects.
Small Appliance Control
The MC9S08QD4MSC fits small appliance control boards - kettles, fans, coffee makers, and simple heaters - where the control logic is a few GPIO outputs, one button, and one analog sensor. The 4-channel 10-bit ADC reads NTC thermistors or potentiometer settings, while 6 GPIO pins drive relays, LEDs, or triac driver circuits directly. The 16 MHz S08 core handles PID-style duty-cycle control with headroom, and the 4 KB FLASH stores control tables and state machines without external memory. The 8-pin SOIC keeps the MCU section of the board under a few square millimeters, cutting BOM cost versus larger MCUs. Designers should budget FLASH carefully, as 4 KB fills quickly once ADC filtering and debouncing routines are added.
Recommended
Battery Charger Supervision
In low-cost linear and switched chargers, the MC9S08QD4MSC supervises charging state: the 10-bit ADC measures battery voltage and current-sense inputs across its 4 channels, and GPIO outputs control charge-enable FETs and status LEDs. The 16 MHz S08 core implements CC/CV state machines, taper detection, and safety timeout logic in the 4 KB FLASH, while the 256 byte RAM holds filtered measurement history. Because the part is End of Life, new charger designs should qualify the S9S08QD4J1CSC or plan last-time-buy inventory. The 8-pin SOIC suits compact charger pucks and in-cable PCBs where board area and cost dominate; ensure ADC reference stability when measuring battery voltage near regulation thresholds.
Recommended
Automotive Auxiliary Functions
NXP positions the QD family for low-end automotive applications, directing automotive buyers to the S-prefix variants (S9S08QD4J1CSC, S9S08QD4J1MSCR) that share the MC9S08QD4MSC die and SOIC-8 footprint. Typical uses include seat-position memory switches, mirror-motor drive supervision, simple LIN-less sensor readouts, and indicator logic. The 4-channel 10-bit ADC reads resistive position sensors, and the 16 MHz core runs debounce and fault-latching logic in 4 KB FLASH. Because the standard M-prefix part is not the automotive ordering code, production programs must use the S9S08QD4 series and verify AEC-grade qualification and temperature range per NXP qualification documentation; the pin-to-pin match minimizes PCB requalification.
Recommended
Industrial Discrete Logic Replacement
The MC9S08QD4MSC is a natural replacement for glue logic, timer ICs, and small PAL/GAL devices on industrial boards. A programmable 8-pin MCU can implement reset supervision, watchdog sequencing, fan startup timing, or sensor threshold alarms in firmware, eliminating multiple fixed-function packages. The 6 GPIO pins handle input switches and output drives, the 10-bit ADC replaces window-comparator circuits for analog trip points, and the 16 MHz S08 core executes timing loops deterministically. Firmware stored in 4 KB FLASH is reprogrammable in-circuit via the single-wire background debug interface, simplifying field variants. When replacing discrete logic, verify GPIO drive-current limits in the NXP data sheet before sourcing relays or LEDs directly from pins.
Recommended
IoT Sensor Node Front-End
In battery-powered sensor nodes, the MC9S08QD4MSC serves as the low-cost front-end that samples analog sensors with the 4-channel 10-bit ADC and formats data for an RF or wired link. The S08 core's STOP mode with background debug still active (when ENBDM is set) supports low average current draw between samples - the data sheet describes clocking behavior in STOP mode. 4 KB FLASH stores scaling tables and a simple serial protocol; 6 GPIOs bit-bang I2C/UART-class links to a radio module or transceiver. The 8-pin SOIC suits coin-cell-sized PCBs. Note that this specific part is EOL, so new nodes should migrate to active NXP entry MCUs while reusing the ADC-sampling firmware architecture.
Recommended
Educational and Prototype Embedded Projects
The QD4's single-wire background debug interface, documented in the NXP data sheet's Development Support chapter, makes the MC9S08QD4MSC approachable for learning 8-bit embedded programming: debugging remains possible even in STOP mode, and no bootloaders or external programmers beyond a BDM pod are needed. The minimal pin count (8 pins, 6 GPIO) forces clean resource budgeting, an excellent teaching constraint. The 10-bit ADC enables hands-on analog labs - temperature, light, and potentiometer experiments - while 4 KB FLASH accommodates complete demonstration programs. For classroom procurement, note the EOL status: labs should source remaining stock now and plan curricula around active S08 or Kinetis parts, reusing the same BDM/SWD debugging methodology.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08QD4MSC — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08QD4CSC | S9S08QD4J1CSC | S9S08QD4J1MSCR | MC9S08QD2MSC |
|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core / Frequency | S08, 16 MHz | S08, 16 MHz | S08, 16 MHz | S08, 16 MHz | S08, 16 MHz |
| Flash Memory | 4 KB | 4 KB | 4 KB | 4 KB | 2 KB |
| RAM | 256 B | 256 B | 256 B | 256 B | 256 B |
| ADC | 4-ch, 10-bit | 4-ch, 10-bit | 4-ch, 10-bit | 4-ch, 10-bit | 4-ch, 10-bit |
| GPIO Count | 6 | 6 | 6 | 6 | 6 |
| Grade / Qualification | Standard (M suffix), EOL | C-grade commercial variant | Automotive-qualified (S prefix) | Automotive-qualified (S prefix) | Standard, EOL family |
| Lifecycle Status | End of Life | EOL family member | EOL family member | EOL family member | EOL family member |
Key Differentiators
- Maximum FLASH in the QD low-pin family (vs MC9S08QD2MSC)
- Standard-flow ordering code for industrial/consumer builds (vs S9S08QD4J1CSC)
- Lowest-end S08 architecture cost point (vs MC9S08QG4CFFE)
Design Notes
The MC9S08QD4MSC is officially End of Life per NXP's product page, which also carries the discontinuance notice, product change notice, and replacement guidance. Before committing a new PCB spin, secure last-time-buy inventory or design in an active alternative. The entire MC9S08QD family shares this EOL trajectory, so treating any QD variant as a long-term sole-source component is a supply-chain risk.
The MC prefix denotes the standard flow; NXP explicitly states that automotive-specific QD devices use part numbers starting with "S" (S9S08QD4 series). Using the MC9S08QD4MSC in a vehicle program will fail the ordering-code and qualification requirements even though the die is similar. Swap to S9S08QD4J1CSC or S9S08QD4J1MSCR and re-verify temperature grade and qualification data before release.
In the 8-pin SOIC, the 6 GPIO pins are heavily multiplexed with ADC inputs, debug, and reset functions. Plan pin assignments against the multiplexing table in the NXP MC9S08QD4 data sheet before layout, and preserve access to the single-wire background debug pin in production fixtures - the data sheet notes BDM remains clocked in STOP mode when ENBDM is set, which is invaluable for production test. Keep a test pad on the debug line.
The exact supply voltage range was not present in the verified data for this page; consult the electrical characteristics chapter of the NXP MC9S08QD4 data sheet before fixing power-rail design values. Do not copy voltage assumptions from other S08 families, and budget ADC reference stability if battery-powered measurement accuracy is required.
Compliance Information
Compliance details were not included in the verified data. The NXP product page includes an Environmental Quality tab where RoHS/REACH status is published. The M-suffix standard flow and S-prefix automotive flow imply different qualification bases; consult NXP for AEC-Q100 evidence on S9S08QD4 parts.
