S9S08QD4J1CSCR - 8-Bit S08 MCU 4KB Flash 16MHz SOIC-8 | NXP
MPN: S9S08QD4J1CSCR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.7968 | $6.80 |
| 10 | $6.12 | $61.20 |
| 100 | $5.44 | $544.00 |
| 500 | $4.89 | $2,445.00 |
| 1,000 | $4.42 | $4,420.00 |
S9S08QD4J1CSCR Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (Flash), volatile data memory (RAM), and on-chip peripherals (timers, I/O, analog, communications) into one package. Within the hierarchy of embedded computing, 8-bit MCUs sit below 16-bit and 32-bit devices but continue to dominate cost-sensitive and space-constrained designs such as appliance controllers, sensor interfaces, automotive body electronics, and human-machine interface (HMI) modules. The HCS08 architecture used here is NXP's evolution of the legacy HC08 core, adding a BGND instruction and a background debugging system that enables in-circuit breakpoints using only a single wire.
Key features of the S9S08QD4J1CSCR include 4 KB (4K x 8) Flash program memory, 256 bytes of RAM, an integrated PWM module, LVD and POR (low-voltage detect and power-on reset), a watchdog timer (WDT), single-wire background debug interface, and 16 MHz CPU throughput from an internal bus. The 2.7 V - 5.5 V operating range supports both 3.3 V and 5 V systems without external level translation, while the wide temperature range suits automotive underhood and industrial environments.
The HCS08 core delivers single-byte instructions at up to 16 MHz bus frequency, enabling efficient C and assembly code generation. Internal peripherals include one timer/PWM module with selectable channels, a keyboard interrupt module capable of waking the CPU from stop modes, and on-chip debug logic accessed through the BKGD pin. The small 8-SOIC footprint suits PCBAs where height and board area are constrained but deterministic real-time control is required.
Typical applications span automotive body controllers (lighting, simple sensor nodes, brushed-motor drivers), consumer appliance controls (white goods, HVAC blowers, fans), industrial sensor interfaces, low-end remote controls, and small form-factor PCBAs requiring single-wire (BKGD) in-circuit programming for field updates and end-of-line test. NXP's S08 family is widely deployed in millions of automotive nodes, providing long-lifecycle availability.
When designing with the S9S08QD4J1CSCR, place a 0.1 µF decoupling capacitor as close as possible to the VDD pin and route the BKGD pin to a header for in-circuit debug. The PTL432LIBQDBZR-compatible LDO is often paired for stable supply rails. Avoid leaving unused I/O pins floating; configure them as outputs or enable internal pull-ups.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. The S9S08QD4J1CSCR remains a popular NXP choice where a small-footprint 8-bit S08 MCU with automotive-grade qualification is needed.
Drop-in alternatives for S9S08QD4J1CSCR — 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 S9S08QD4J1CSCR (same form factor and footprint) — differing in Debug Interface, Package, RAM, Mounting Type, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
S9S08QD4J1CSC
✅ Drop-In📋 Reference alternative (not in catalog)
S9S08QD4J1MSCR
✅ Drop-In📋 Reference alternative (not in catalog)
S9S08QD4J1MSC
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08QD4CSC
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC9S08QD4MPC
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →S9S08QD4J1CSCR Maximum Ratings & Electrical Characteristics
| Core Processor | S08 (HCS08) |
| Core Size | 8-bit |
| CPU Speed | 16 MHz |
| Program Memory Size | 4 KB (4K x 8) Flash |
| RAM Size | 256 bytes (256 x 8) |
| Supply Voltage (Vcc/Vdd) | 2.7 V to 5.5 V |
| Operating Temperature | -40 °C to +85 °C (Automotive Grade) |
| Number of I/O Pins | 4 (plus input-only and output-only pins) |
| Package | 8-SOIC (SOIC-8) |
| Peripherals | LVD, POR, PWM, WDT |
| Connectivity | - |
| Program Memory Type | Flash |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Debug Interface | Single-wire Background Debug Mode (BKGD) |
S9S08QD4J1CSCR Pin Configuration
| Pin 1 | BKGD/MS — Background Debug Mode / Mode Select (single-wire debug interface) |
| Pin 2 | PTA5/KBI — General-purpose I/O / Keyboard Interrupt |
| Pin 3 | PTA4/TPMCH1 — General-purpose I/O / TPM Channel 1 (PWM) |
| Pin 4 | VSS — Ground |
| Pin 5 | PTA3/TPMCH2 — General-purpose I/O / TPM Channel 2 (PWM) |
| Pin 6 | PTA2/KBI — General-purpose I/O / Keyboard Interrupt |
| Pin 7 | PTA0/TCLK — General-purpose I/O / Timer Clock Input |
| Pin 8 | VDD — Positive supply voltage (2.7 V to 5.5 V) |
Typical Applications
S9S08QD4J1CSCR is suitable for 7 applications: Automotive Body Control Modules, Industrial Sensor Interface Nodes, Consumer Appliance Controls, HVAC Blower and Fan Controllers, Brushed DC Motor Drive Nodes, Remote Control and Wireless Sensor Endpoints, LED Lighting Control Modules.
Automotive Body Control Modules
Automotive body controllers are the central application for which the S9S08QD4J1CSCR was designed, given its -40 °C to +85 °C automotive-grade qualification. The 16 MHz HCS08 core plus integrated PWM, LVD, POR, and WDT peripherals drive lighting, interior switch scanning, and brushed motor control nodes across the CAN/LIN network. The 4 KB Flash suits compact lighting-state and door-handle firmware, while the 256-byte RAM allows simple LED-pattern state machines. The single-wire BKGD debug interface makes end-of-line programming inexpensive, which is critical for high-volume automotive production. Using the S9S08QD4J1CSCR in body controllers delivers long-lifecycle availability that NXP guarantees for automotive customers.
Recommended
Industrial Sensor Interface Nodes
The S9S08QD4J1CSCR is widely used in industrial sensor interface modules where its 2.7 V-5.5 V supply range and small SOIC-8 footprint simplify compact PCBs. The 16 MHz HCS08 CPU reads digital sensors, formats data over UART or PWM-to-voltage interfaces, and the integrated WDT protects against firmware lockup in unattended installations. The Flash-based program memory supports in-field firmware updates via BKGD, allowing field maintenance without firmware extraction. Engineers pair the MCU with industrial-grade sensors, where the -40 °C to +85 °C range tolerates factory-floor temperature variations and the LVD/POR block ensures clean reset on supply transients.
Recommended
Consumer Appliance Controls
In consumer appliances the S9S08QD4J1CSCR provides just enough Flash and CPU to handle user-interface, timer, and motor-control duties at minimal BOM cost. The 4 KB Flash fits a state-machine plus simple LCD/LED driver, while the 4 GPIO plus input-only and output-only pins drive keyboards, buzzer outputs, and relay/MOSFET drivers. Operating from 2.7 V-5.5 V allows direct connection to rectified 5 V or 3.3 V rails without level translation, and the integrated PWM produces PWM outputs for brushless DC motor speed control in fans and small pumps. White-goods designers value the SOIC-8 footprint for service-friendly through-hole-compatible layouts.
Recommended
HVAC Blower and Fan Controllers
HVAC blower controllers benefit from the S9S08QD4J1CSCR's combination of PWM, WDT, and LVD/POR peripherals in a compact SOIC-8. The HCS08 core computes fan speed profiles from thermistor or UART inputs, while the integrated PWM drives a power MOSFET for variable-speed blower control. The 16 MHz CPU sustains proportional-integral loops at the modest rates required by thermal management, and the -40 °C to +85 °C range covers underhood and indoor HVAC environments. NXP's 8-bit S08 ecosystem provides reference firmware for PI control and soft-start profiles, cutting development time for HVAC module designers.
Recommended
Brushed DC Motor Drive Nodes
The S9S08QD4J1CSCR is a frequent choice for small brushed DC motor drive nodes in automotive seat adjusters, mirror actuators, and industrial valve actuators. Its 16 MHz HCS08 CPU generates PWM waveforms for H-bridge control, while the LVD module protects the motor at low battery conditions and the WDT recovers the drive after firmware faults. The 4 KB Flash holds motion-profile tables, and 256-byte RAM is sufficient for transient position tracking. The single-wire BKGD interface enables in-circuit flash programming during the actuator assembly process and supports service mode firmware updates.
Recommended
Remote Control and Wireless Sensor Endpoints
Battery-powered remote controls and wireless sensor endpoints benefit from the S9S08QD4J1CSCR's low-cost 8-bit footprint and wide 2.7 V-5.5 V supply window. The HCS08 core handles button scanning via the keyboard interrupt module, wakes from stop modes for short bursts, and the Flash program memory supports OTA-style field updates through the BKGD interface. The 256-byte RAM is adequate for buffering short telemetry payloads before transmitting via companion transceivers. Automotive and consumer-grade qualification enables deployment across both automotive key-fob replacement and industrial sensor tags without code-porting overhead.
Recommended
LED Lighting Control Modules
LED lighting controllers for automotive exterior and interior lighting use the S9S08QD4J1CSCR for compact SOIC-8 designs. The PWM module dims LED strings with a frequency above the flicker-fusion threshold, while the 4 GPIO pins drive multiple parallel LED channels with software multiplexing. The -40 °C to +85 °C range supports tail-light, dome-light, and ambient-lighting modules, and the integrated LVD ensures the controller fails-safe during cranking transients. With 4 KB Flash, designers implement breathing effects, sequential turn signals, and CIE-1931 color-mixing profiles without external memory.
Recommended
Recommended Products Summary
Engineering reference data for S9S08QD4J1CSCR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | S9S08QD4J1CSC | S9S08QD4J1MSCR | MC9S08QD4CSC |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| CPU Core | HCS08 / S08 (8-bit) | HCS08 / S08 | HCS08 / S08 | HCS08 / S08 |
| Max CPU Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Program Flash | 4 KB | 4 KB | 4 KB | 4 KB |
| RAM Size | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Supply Voltage | 2.7 V - 5.5 V | 2.7 V - 5.5 V | 2.7 V - 5.5 V | 2.7 V - 5.5 V |
| Temperature Grade | Automotive (-40 °C to +85 °C) | Automotive (-40 °C to +85 °C) | Automotive (-40 °C to +85 °C) | Commercial (0 °C to +70 °C) |
| Debug Interface | Single-wire BKGD | Single-wire BKGD | Single-wire BKGD | Single-wire BKGD |
Key Differentiators
- Automotive-qualified vs commercial-grade sibling (vs MC9S08QD4CSC)
- 256-byte RAM vs smaller competitor RAM (vs PIC16F636)
- Single-wire BKGD vs multi-pin debug on competitors (vs PIC16F1823)
- Wide 2.7 V-5.5 V supply (vs MC9S08QD4MPC)
Design Notes
Place a 0.1 µF ceramic decoupling capacitor as close as possible to the VDD pin (pin 8) with the ground return via pin 4 (VSS). For designs that source high transient currents from the same 5 V rail (e.g., relay or LED arrays), add a 1 µF bulk capacitor within 25 mm of the MCU. The integrated LVD module trips at the configured low-voltage threshold to generate a POR; ensure supply rise time is faster than the LVD hold time, otherwise the device may boot prematurely. Estimated: at 5 V VDD and 16 MHz CPU, the typical VDD current is below 10 mA, so the 0.1 µF cap is adequate for digital switching noise.
Route the BKGD (pin 1) to a 2-pin header or test pad for in-circuit programming. Keep BKGD traces short (<50 mm) and away from PWM outputs that may inject noise via capacitive coupling. The four general-purpose I/O pins share the PTA port and include analog-tolerant pins; do not connect external pull-ups higher than 10 kΩ to avoid loading the high-impedance pins during reset. When using keyboard interrupts, add a 100 ns filter cap to suppress contact-bounce on KBI inputs if mechanical switches are present.
Do not leave unused I/O pins floating - configure them as outputs or enable internal pull-ups in firmware, or floating pins may inject current through the protection diodes and disturb ADC/PWM readings. The HC08 instruction set is upward-compatible with HCS08, but be careful not to use HCS08-only instructions (BGND, DAA) on legacy HC08 cores; this part has HCS08 so all op-codes are valid. Avoid placing the MCU within 5 mm of heat-generating components since the -40 °C to +85 °C specification is ambient, not junction.
For automotive EMC compliance, place a ferrite bead in series with the VDD supply pin and ensure the SOIC-8 ground pin connects to a continuous ground pour. The 16 MHz CPU produces harmonics at 16, 48, 80 MHz etc.; their emissions are typically below automotive CISPR-25 Class-1 limits when the recommended decoupling scheme is followed. Use spread-spectrum or slower TPM clock sources if radiated emissions tests fail. Do not use the internal oscillator above 16 MHz without verifying the datasheet's electrical characteristics table.
Compliance Information
Automotive-grade (AEC-Q100) qualification per NXP S9S08 family tier. Halogen-free status not explicitly stated in verified web data; marked unknown. RoHS and REACH compliance confirmed via NXP and LCSC distributor pages.
