NXP Semiconductors MC9S08SH8CTJR

Overview

MC9S08SH8CTJR from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 8 KB on-chip FLASH, 512 B RAM, and integrated peripherals including 10-bit ADC, analog comparator, SCI, SPI, I²C, two TPM modules, RTC, and low-power stop/wait modes. It operates across -40°C to 105°C and supports internal clock source (ICS) with FLL for bus frequencies up to 20 MHz - used in automotive body electronics, industrial sensor nodes, and appliance control.

For engineers reviewing the MC9S08SH8CTJR datasheet, MC9S08SH8CTJR pinout, MC9S08SH8CTJR application, or MC9S08SH8CTJR equivalent, key selection criteria include its 24-QFN package with exposed thermal pad, single-wire background debug interface, stop3 mode operation with ADC/ACMP active, and compatibility with legacy HCS08 toolchains and development ecosystems.

Technical Context

The MC9S08SH8CTJR implements the S08CPUV2 core with HC08 instruction set extension (BGND), supporting up to 32 interrupt/reset sources and full in-circuit debugging via single-wire BDM. Its ICS module integrates a frequency-locked loop (FLL) with precision-trimmed internal reference (±2% over voltage/temperature), enabling stable bus clocks without external crystal in cost-sensitive designs.

Peripherals are optimized for low-power embedded control: ADC runs in stop3 mode with 2.5 µs conversion time and temperature sensor channel; ACMP supports edge-triggered interrupts and routing to TPM for windowed monitoring; RTC uses a free-running 1-kHz on-chip oscillator for cyclic wake-up without external components.

Key Specifications

Pinout & Package

MC9S08SH8CTJR is housed in a 24-pin QFN package (case outline 98ASA00474D) with 4 mm × 4 mm body, 0.5 mm lead pitch, and exposed thermal pad for improved heat dissipation. The package is RoHS-compliant and designed for reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC9S08SH8CTJR, MC9S08AC16CFGE offers expanded memory in a larger package but identical peripheral functionality, while S9KEAZ128AMLH shifts to ARM architecture with richer interfaces at the cost of software migration effort and higher BOM complexity.

Availability

MC9S08SH8CTJR is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, smart appliance control panels, and LED lighting dimmer modules requiring stable component supply, long-lifecycle support, and qualified sourcing for production programs.

Supply support for MC9S08SH8CTJR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips' semiconductor division, now headquartered in Eindhoven, Netherlands, delivering secure, connected, and intelligent solutions for automotive, industrial, IoT, and mobile markets.

The MC9S08SH8CTJR belongs to the HCS08 microcontroller family, designed specifically for cost-sensitive, low-power embedded control applications in automotive and industrial environments where reliability, debuggability, and peripheral integration are critical.

FAQ

What is the operating temperature range for the MC9S08SH8CTJR?

The MC9S08SH8CTJR is rated for operation from -40°C to +105°C, meeting extended temperature requirements for under-hood automotive and industrial control applications. This range is validated across all electrical specifications including FLASH endurance, ADC accuracy, and ICS stability - ensuring consistent behavior in thermally demanding environments where the MC9S08SH8CTJR serves as primary system controller.

Does the MC9S08SH8CTJR support in-system programming via its debug interface?

Yes, the MC9S08SH8CTJR supports full in-system programming and debugging through its single-wire background debug (BDM) interface on the BKGD/MS pin. Using standard Freescale/NXP BDM tools, users can erase, program, and verify FLASH memory, set breakpoints, and inspect registers without removing the MC9S08SH8CTJR from the target board - essential for iterative development and field firmware updates.

Can the MC9S08SH8CTJR operate without an external crystal?

Yes, the MC9S08SH8CTJR can operate entirely from its internal clock source (ICS) module, which includes a frequency-locked loop (FLL) driven by a precision-trimmed internal RC oscillator. This allows the MC9S08SH8CTJR to achieve bus frequencies up to 20 MHz without any external timing components - reducing BOM cost and board space in applications like appliance control or sensor nodes where absolute timing accuracy is secondary to cost and simplicity.

What peripheral modules remain active in stop3 mode on the MC9S08SH8CTJR?

In stop3 mode, the MC9S08SH8CTJR maintains operation of the ADC, analog comparator (ACMP), real-time counter (RTC), and internal 1-kHz low-power oscillator - enabling autonomous sensor sampling, threshold monitoring, and timed wake-up without CPU intervention. This capability makes the MC9S08SH8CTJR especially valuable in battery-powered systems where minimizing active current draw is critical to extending operational life.

Is the MC9S08SH8CTJR pin-compatible with other members of the HCS08 SH-series?

No, the MC9S08SH8CTJR in 24-QFN package is not pin-compatible with other SH-series variants such as the 20-TSSOP or 20-SOIC versions due to differing pin counts and assignments. While functional compatibility exists across the SH family (same register map and peripheral set), physical replacement requires PCB redesign - confirming that the MC9S08SH8CTJR must be selected and laid out specifically for its 24-QFN footprint and signal mapping.