MC9S08SH8MTJ - 8-bit MCU 8KB Flash 40MHz TSSOP-20 | NXP
MPN: MC9S08SH8MTJ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.78 | $6.78 |
| 10 | $6.24 | $62.40 |
| 100 | $5.72 | $572.00 |
| 500 | $5.24 | $2,620.00 |
| 1,000 | $4.79 | $4,790.00 |
MC9S08SH8MTJ Overview
An 8-bit microcontroller is an embedded processor that executes instructions on 8-bit data words, sitting at the entry level of the microcontroller hierarchy: MCU -> embedded processor -> system-on-chip. The HCS08 family, originally developed by Freescale Semiconductor (now NXP), extends the popular HC08 instruction set with the added BGND instruction and enhanced low-power modes, making it a mainstay for cost-sensitive control tasks such as appliance control, automotive body electronics, and industrial sensing nodes.
Key features of the MC9S08SH8MTJ include the 40MHz HCS08 CISC CPU (20MHz bus clock), 8KB of on-chip Flash program memory, and 0.512KB of internal RAM. Peripherals include a 12-channel, 10-bit analog-to-digital converter for direct sensor interfacing and an analog comparator for voltage-monitoring duties. The device supports up to 32 interrupt and reset sources and operates across a wide 2.7V to 5.5V supply range, allowing direct connection to both 3.3V and 5V systems.
Architecturally, the S08 core executes the HC08 instruction set with full object-code compatibility, easing migration from legacy HC08 designs. The S08SH family is positioned as a low-end option for applications in the 5-volt range, and integrated low-voltage detection (LVD) protects against brown-out conditions. On-chip Flash supports in-circuit reprogramming, reducing development cycle time.
Typical applications include small appliance and power-tool control, low-cost sensor nodes using the 10-bit ADC, LIN-bus slave nodes in automotive body electronics, and 5V industrial logic glue functions where a compact 20-pin TSSOP footprint and 5V tolerance are required.
When designing with this part, note that NXP lists the MC9S08SH8MTJ as NRND (Not Recommended for New Designs); new projects should evaluate current-generation alternatives, while existing designs can continue sourcing for maintenance.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer product page, delivering information gain beyond a standard datasheet listing.
Drop-in alternatives for MC9S08SH8MTJ — 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 MC9S08SH8MTJ (same form factor and footprint) — differing in Package, RAM, Flash Memory, Instruction Set, Core Processor.
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Request AlternativesMC9S08SH8MTJ Maximum Ratings & Electrical Characteristics
| Core Processor | S08 (HCS08), 8-bit CISC |
| Core Size | 8-bit |
| Maximum CPU Speed | 40 MHz (20 MHz bus) |
| Flash Memory | 8 KB (8K x 8) |
| RAM | 0.512 KB |
| Operating Voltage Range | 2.7 V to 5.5 V |
| Connectivity | I2C, LINbus, SCI, SPI |
| ADC Resolution | 10-bit, 12-channel |
| Analog Comparator | Yes |
| Interrupt/Reset Sources | Up to 32 |
| Package | 20-TSSOP (0.173 inch, 4.40 mm width) |
| Pin Count | 20 |
| Mounting Type | Surface Mount |
| Instruction Set | HC08 with added BGND instruction |
| Low Voltage Detection | Yes (LVD) |
| Lifecycle Status | NRND (Not Recommended for New Designs) per NXP |
MC9S08SH8MTJ 20-tssop (0.173 inch, 4.40 mm width) Pin Configuration Guide
Pin configuration for MC9S08SH8MTJ (20-tssop (0.173 inch, 4.40 mm width) 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 MC9S08SH8MTJ.
Refer to the datasheet for full pin configuration.
Typical Applications
MC9S08SH8MTJ is suitable for 6 applications: Small Appliance and Power Tool Control, Automotive LIN Bus Slave Nodes, Low-Cost Analog Sensor Nodes, 5V Industrial Logic and Glue Functions, Battery-Powered Portable Devices, Legacy HC08 Design Migration.
Small Appliance and Power Tool Control
The MC9S08SH8MTJ fits low-cost appliance and power-tool control boards where a compact MCU handles switch inputs, motor timing, and protection logic in a 20-pin TSSOP footprint. Its 40MHz HCS08 core (20MHz bus) provides adequate instruction throughput for simple control loops, while the wide 2.7V to 5.5V supply range tolerates unregulated rectified supplies after a simple regulator. The integrated low-voltage detection protects firmware integrity during supply dips, and the 12-channel 10-bit ADC reads temperature sensors and potentiometer speed settings directly, eliminating external converter ICs. The 8KB Flash accommodates typical appliance control code with room for OTA-style field updates via the in-circuit Flash programming capability.
Recommended
Automotive LIN Bus Slave Nodes
In automotive body electronics, the MC9S08SH8MTJ serves as a LIN bus slave controller for seat adjusters, mirror controls, window lifts, and lighting modules. The on-chip SCI provides the LIN serial interface, the 5V-range 2.7V to 5.5V supply tolerates automotive rail transients, and the analog comparator plus 10-bit ADC monitor switch states and load currents for diagnostic reporting. The S08 family has a long heritage in Freescale/NXP automotive programs, so toolchains and reference LIN stacks are mature. As the part is NRND, use it for service and legacy production continuity; new automotive programs should select a current-generation NXP automotive MCU with active lifecycle status and AEC qualification.
Recommended
Low-Cost Analog Sensor Nodes
For industrial and building sensing nodes, the MC9S08SH8MTJ's 12-channel, 10-bit ADC is the headline feature: temperature, humidity, pressure, and potentiometer signals can be multiplexed across twelve inputs without external analog front-end components. The additional analog comparator supports threshold alarms that operate independently of software, useful for over-temperature or over-current shutdown. The SPI and I2C interfaces connect external EEPROMs or display drivers, while the SCI links to a host controller. With 8KB Flash and 0.512KB RAM, simple filtering and compensation algorithms fit comfortably, and the compact 20-TSSOP package keeps the node small enough for inside-housing mounting.
Recommended
5V Industrial Logic and Glue Functions
Many legacy industrial systems run on 5V logic where 3.3V-only modern MCUs require level shifting. The MC9S08SH8MTJ operates natively at 5V, making it a natural fit for retrofit, custom protocol bridges, and intelligent glue logic replacing fixed-function ASICs or HC-series logic clusters. Its HC08-compatible instruction set simplifies porting code written for older MC68HC908 designs, and the BGND background-debug instruction speeds in-system servicing. Up to 32 interrupt/reset sources handle multiple event inputs, and the 40MHz core clock (20MHz bus) outpaces legacy 8-bit parts, letting one MCU consolidate counters, encoders, and serial bridges on a single 20-pin device.
Recommended
Battery-Powered Portable Devices
The S08SH family's low-power wait and stop modes suit battery-operated products such as remote controls, meters, and handheld instruments. In stop mode the core halts while wakeup sources - including the keyboard interrupts among the up to 32 interrupt/reset sources and the LVD - remain available, letting the device spend most of its life in sleep and wake only on user input or periodic ADC sampling. Operating down to 2.7V means the MCU runs directly from three alkaline cells or a single lithium cell through regulation, extracting full battery capacity. The 20-TSSOP surface-mount package supports compact, automated assembly for portable production volumes.
Recommended
Legacy HC08 Design Migration
Designs built on Freescale/NXP HC08 parts such as the MC68HC908 family can migrate to the MC9S08SH8MTJ with minimal effort because the S08 core executes the HC08 instruction set with full object-code compatibility, adding only the BGND instruction and improved debugging. The 40MHz core doubles effective performance over typical 8MHz HC08 designs, and the 8KB Flash with in-circuit programming replaces windowed or one-time-programmable EPROM parts, eliminating socket costs during development. The integrated 10-bit ADC and comparator replace discrete conversion circuits frequently added around HC08 parts. This migration path keeps mature products manufacturable while consolidating obsolete components into a single, currently listed package.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08SH8MTJ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08SH8MTG | MC9S08SH4MTG | MC9S08SH4MFK |
|---|---|---|---|---|
| Package | 20-TSSOP | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core / Speed | S08, 40 MHz | S08, 40 MHz | S08, 40 MHz | S08, 40 MHz |
| Flash Memory | 8 KB | 8 KB | 4 KB | 4 KB |
| ADC | 10-bit, 12-channel | 10-bit, 12-channel | 10-bit, 12-channel | 10-bit, 12-channel |
| Supply 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 |
Key Differentiators
- Full 8KB Flash in a compact 20-pin TSSOP (vs MC9S08SH4MTG)
- Native 5V operation across 2.7V to 5.5V (vs MC9S08SH8MTG)
- Trade-off: NRND lifecycle status (vs MC9S08SH8MTG)
Design Notes
Confirm lifecycle before committing. NXP's official product page lists the MC9S08SH8MTJ as NRND with discontinuance and replacement product change notices published, while some distributor databases still show ACTIVE. The manufacturer page is authoritative: design new boards only if you have a last-time-buy strategy or a validated second source such as the MC9S08SH8MTG. For existing products, monitor NXP PCNs and budget a final order covering remaining production lifetime plus service spares.
The 2.7V to 5.5V supply range permits direct 5V operation, but decouple VDD with a 0.1uF ceramic capacitor placed within a few millimeters of the pin, plus bulk capacitance at the regulator. The integrated low-voltage detection (LVD) resets the MCU during brown-out; verify the LVD trip point against your regulator's droop behavior so a supply sag during motor start does not cause spurious resets. In mixed 3.3V/5V systems, remember all GPIO swing with VDD when interfacing to 3.3V-only peripherals.
Keep the analog front-end clean: route ADC inputs away from the SCI/LIN and SPI clock lines, and place a small RC filter (e.g., 1k ohm plus 1nF, sized per signal bandwidth) on noisy sensor channels before the 10-bit ADC pins. Use the exposed routing under the 20-TSSOP for a solid ground plane to reduce ADC reference noise. Unused GPIO should be configured as outputs driving low or inputs with pull-ups per the S08 family user guide to avoid floating-pin leakage in stop modes.
For LIN bus nodes, the SCI output drives a LIN transceiver, not the bus directly - always pair with an NXP LIN transceiver and follow the LIN physical layer requirements for pull-up and bus capacitance. Keep the BGND single-wire debug pin accessible via a 3-pin header in production boards; this preserves field firmware update capability through the background debug controller without increasing BOM cost.
Compliance Information
NXP product page provides an Environmental Quality section for this part, but specific RoHS/REACH status was not included in the retrieved web data and must be confirmed from the official NXP page.
