MC9S08SH4MTJ - 8-bit S08 MCU 4KB Flash 40MHz | NXP | 20-TSSOP
MPN: MC9S08SH4MTJ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.3 | $3.30 |
| 10 | $2.97 | $29.70 |
| 100 | $2.64 | $264.00 |
| 500 | $2.31 | $1,155.00 |
| 1,000 | $1.98 | $1,980.00 |
MC9S08SH4MTJ Overview
A microcontroller (MCU) is a single-chip computer containing a CPU, memory (Flash/RAM), and programmable peripherals. The S08 architecture is a CISC (Complex Instruction Set Computer) core descended from the HC08 family, designed for low power consumption and deterministic interrupt response in cost-sensitive embedded applications. The S08SH family sits within the broader NXP 8-bit microcontroller portfolio, providing a migration path from legacy HC08 designs while adding modern peripherals.
Key features include 40MHz maximum bus clock (20MHz internal bus), 4KB Flash program memory, 256B RAM, and an integrated 10-bit ADC with up to 12 channels. Communication peripherals include one SCI (UART) module, one SPI module, and one I2C module. The device also integrates an analog comparator, a temperature sensor, and a 6-channel 16-bit timer. An integrated voltage regulator supports 2.7V to 5.5V operation, allowing direct connection to 5V systems.
The S08SH architecture uses a von Neumann bus with a 16-bit internal address space and 8-bit data path. The CPU executes the HC08 instruction set with the added BGND instruction for background debug mode (BDM), enabling in-circuit programming and real-time debug via a single-wire interface. The on-chip clock generator can operate from an internal 32kHz or 8MHz/16MHz/20MHz trimmed reference, reducing external component count.
Typical applications include low-cost consumer appliances, battery chargers, white goods control boards, automotive body electronics (non-safety), HVAC thermostats, and industrial sensor interfaces. The wide 2.7V-5.5V supply range and integrated peripherals minimize external component count in space-constrained designs.
Design consideration: The TSSOP-20 package has limited thermal dissipation, so power-constrained applications should rely on the device's low-power wait and stop modes rather than sustained high-frequency operation. The MC9S08SH4MTJ is pin, tool, and software compatible with the larger Flash S08SH family members (SH8, SH16), enabling code reuse across the family.
This page synthesizes distributor pricing, parametric comparison with S08SH family variants, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for MC9S08SH4MTJ — 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 MC9S08SH4MTJ (same form factor and footprint) — differing in Package, Operating Temperature, RAM, ADC, ADC Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S08SH8MTJ
✅ Drop-In✓ In Stock
$4.79 / Unit
View Datasheet →MC9S08SH16MTJ
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →MC9S08SH4CTG
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.05 / Unit
View Datasheet →MC9S08SH4MTJ Maximum Ratings & Electrical Characteristics
| Core | S08 (HCS08) |
| Data Bus Width | 8 bit |
| Maximum CPU Frequency | 40 MHz |
| Program Memory (Flash) | 4 KB (4K x 8) |
| RAM | 256 B |
| Supply Voltage | 2.7 V to 5.5 V |
| Operating Temperature | -40C to +85C |
| Package | 20-TSSOP (0.173", 4.40mm Width) |
| Package Type | TSSOP-20 |
| ADC | 10-bit, up to 12 channels |
| Communication Peripherals | 1x SCI (UART), 1x SPI, 1x I2C |
| Timers | 16-bit, multiple channels |
| Analog Comparator | Yes |
| Temperature Sensor | Yes (internal) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
MC9S08SH4MTJ Pin Configuration
| Pin 1 | PTA0/TCLK — General-purpose I/O / Timer channel |
| Pin 2 | PTA1 — General-purpose I/O |
| Pin 3 | PTA2 — General-purpose I/O |
| Pin 4 | PTA3 — General-purpose I/O |
| Pin 5 | PTA4 — General-purpose I/O |
| Pin 6 | VDD — Power supply |
| Pin 7 | VSS — Ground |
| Pin 8 | PTA6 — General-purpose I/O |
| Pin 9 | PTA7 — General-purpose I/O |
| Pin 10 | PTB0/ADC0 — GPIO / ADC channel 0 |
| Pin 11 | PTB1/ADC1 — GPIO / ADC channel 1 |
| Pin 12 | PTB2/ADC2 — GPIO / ADC channel 2 |
| Pin 13 | PTB3/ADC3 — GPIO / ADC channel 3 |
| Pin 14 | PTB4/ADC4 — GPIO / ADC channel 4 |
| Pin 15 | PTB5/ADC5 — GPIO / ADC channel 5 |
| Pin 16 | PTB6/ADC6 — GPIO / ADC channel 6 |
| Pin 17 | PTB7/ADC7 — GPIO / ADC channel 7 |
| Pin 18 | RESET — Reset input (active low) |
| Pin 19 | BKGD/MS — Background Debug / Mode Select |
| Pin 20 | PTG0 — General-purpose I/O |
Typical Applications
MC9S08SH4MTJ is suitable for 6 applications: Consumer Appliance Control Boards, Battery Charger Controllers, HVAC Thermostats, Industrial Sensor Interfaces, Automotive Body Electronics (Non-Safety), Smart Home Edge Devices.
Consumer Appliance Control Boards
The MC9S08SH4MTJ fits consumer appliance control boards (washing machines, microwave ovens, coffee makers) due to its 2.7V-5.5V supply range allowing direct connection to rectified 5V rails, integrated 10-bit ADC for sensor conditioning, and small 20-pin TSSOP footprint. The 40MHz S08 core handles user interface scanning and motor timing; the 4KB Flash accommodates typical appliance firmware (mode logic, fault detection, LED patterns). The analog comparator enables zero-crossing detection for triac-controlled heater elements without external circuitry.
Recommended
Battery Charger Controllers
The MC9S08SH4MTJ suits battery charger controllers for cordless tools, e-bikes, and consumer Li-ion packs. The S08 core's fast interrupt response handles CC/CV loop control, while the 10-bit ADC monitors battery voltage, charge current, and temperature via the integrated sensor. The 16-bit timer generates PWM for the power stage, and the SCI/UART enables SMBus or proprietary communication with battery gauge ICs. The 2.7V minimum supply supports direct connection to single-cell Li-ion packs.
Recommended
HVAC Thermostats
The MC9S08SH4MTJ is a strong fit for residential HVAC thermostats where cost-sensitive 8-bit processing is sufficient. Its integrated temperature sensor provides on-chip ambient monitoring, the ADC reads remote thermistor inputs, and the GPIO/timer drives relay control for heating/cooling stages. The 2.7V-5.5V supply range allows direct 24VAC-derived DC operation. Low-power stop modes extend battery life in wireless thermostat designs where average current draw must stay below 10uA.
Recommended
Industrial Sensor Interfaces
The MC9S08SH4MTJ suits industrial sensor interfaces (proximity, level, flow meters) requiring signal conditioning, calibration storage, and digital output via SPI/UART. The 10-bit ADC with up to 12 inputs handles multiple sensor channels, while the 4KB Flash stores calibration constants and linearization tables. The 40MHz CPU performs real-time RMS calculations or statistical filtering on sensor data. The wide supply tolerance accommodates 24V industrial rails with simple linear regulation.
Recommended
Automotive Body Electronics (Non-Safety)
For non-safety automotive body electronics (interior lighting, seat position, mirror adjust), the MC9S08SH4MTJ provides sufficient compute and peripheral resources. The 5V-tolerant I/O matches automotive 5V bus standards, the SCI supports LIN slave communication via software, and the timer drives PWM-controlled actuators. Note that the standard MC9S08SH4MTJ is not AEC-Q100 qualified; for AEC-Q100 requirements use the automotive-grade S08SH variants or design in additional qualification testing.
Recommended
Smart Home Edge Devices
The MC9S08SH4MTJ fits cost-sensitive smart home edge nodes (door/window sensors, simple remote controls, button panels) where wireless SoCs are overkill. The S08 core runs ZigBee or proprietary RF stack portions, the ADC monitors battery voltage and environmental sensors, and the I2C bus connects to peripheral sensors or expanders. Low-power stop and wait modes extend coin-cell battery life. The 20-pin TSSOP package enables compact PCB designs inside small enclosures.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08SH4MTJ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08SH8MTJ | MC9S08SH16MTJ |
|---|---|---|---|
| Package | TSSOP-20 | TSSOP-20 - same | TSSOP-20 - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Flash Memory | 4 KB | 8 KB | 16 KB |
| Max CPU Frequency | 40 MHz | 40 MHz | 40 MHz |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| ADC | 10-bit, up to 12 channels | 10-bit, up to 12 channels | 10-bit, up to 12 channels |
Key Differentiators
- Smallest Flash in the S08SH TSSOP-20 family (vs MC9S08SH8MTJ)
- 5V-tolerant I/O for direct industrial/automotive rail connection (vs MC9S08SH16MTJ)
- Integrated temperature sensor and analog comparator (vs MC9S08SH8MTJ)
Design Notes
The MC9S08SH4MTJ's 2.7V to 5.5V supply range allows direct operation from a 3.3V or 5V rail. Decouple VDD (pin 6) and VSS (pin 7) with a 100nF ceramic capacitor placed within 5mm of the package. For noise-sensitive applications, add a 10uF bulk capacitor near the supply pin. The integrated voltage regulator eliminates the need for an external core supply, simplifying the BOM.
The TSSOP-20 'MTJ' suffix designates only the package; the 'MC9S08SH4' prefix defines the Flash size. Ordering a similar suffix like 'CTG' may result in a different temperature grade - verify the full ordering code in the NXP datasheet before procurement. The S08SH family is NRND across most variants; new designs should evaluate active S08 families or migrate to Kinetis E series.
Place the external reset capacitor on the RESET pin close to the IC if a slower reset timing is desired. Route the BKGD/MS debug pin to a header or test point even in production - field firmware updates and BDM debugging require this pin. The 20-pin TSSOP allows hand-soldering with care; use a fine-tip iron and no-clean flux to avoid bridges on the 0.65mm pitch leads.
Compliance Information
RoHS and lead-free per NXP product page. The MC9S08SH4MTJ is not AEC-Q100 qualified - for automotive applications requiring AEC-Q100, use the dedicated automotive-grade S08SH variants. Lifecycle status is NRND per NXP.
