NXP Semiconductors S9S08RN8W2MTJ

Overview

S9S08RN8W2MTJ from NXP Semiconductors (formerly Freescale) is an automotive-grade 8-bit S08 MCU with 8 KB flash, 256-byte EEPROM with ECC, and 2 KB RAM, operating from 2.7 V to 5.5 V across –40 °C to 125 °C. It integrates ADC (10-channel, 10-bit), dual SCI/UART, I²C, SPI, FTM timers, TSI touch sensing, and low-power stop3 mode consuming 4.6 µA - deployed in body control modules and sensor interface units.

For engineers reviewing the S9S08RN8W2MTJ datasheet, S9S08RN8W2MTJ pinout, S9S08RN8W2MTJ application, or S9S08RN8W2MTJ equivalent, this page delivers verified technical context, package-specific pin assignments, real-world use cases, and validated alternative options for automotive embedded designs requiring AEC-Q100 compliance, robust ESD protection (±6 kV HBM), and deterministic low-power operation.

Technical Context

The S9S08RN8W2MTJ implements an S08 CPU core with up to 20 MHz bus frequency, four-level nested interrupt support, and on-chip memory protection. Its clock system combines a Pierce oscillator (XOSC) with an internal clock source (ICS) featuring FLL and factory-trimmed internal reference (±2% deviation over –40 °C to 125 °C).

System-level protection includes independent watchdog timer, programmable low-voltage detect (LVD) with four warning thresholds per range, illegal opcode/address detection, and single-wire background debug interface with three breakpoints. Peripheral integration covers ACMP, CRC, RTC, MTIM, and two FTM modules (6- and 2-channel) supporting PWM, input capture, and edge-aligned modes.

Key Specifications

Pinout & Package

20-pin TSSOP (JEDEC MO-153) package with exposed pad not electrically connected; thermal resistance θJA = 116 °C/W on single-layer board and 76 °C/W on four-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S9S08RN8W2MTJ, MC9S08RN8W2MTJ offers identical functionality under legacy nomenclature, while S9S08RN16W2MTJ provides scalable memory and enhanced ADC capability - both retain full pin compatibility and qualification for automotive (-40 °C to 125 °C) operation.

Availability

S9S08RN8W2MTJ is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and smart appliance control systems requiring stable component supply, AEC-Q100 Grade 1 qualification, and long-term lifecycle support.

Supply support for S9S08RN8W2MTJ 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in microcontrollers dating to Motorola and Freescale.

The S9S08RN8W2MTJ belongs to the S08RN family designed specifically for cost-sensitive, reliability-critical automotive body electronics and industrial control applications demanding extended temperature operation and robust EMC performance.

FAQ

What is the maximum bus frequency supported by the S9S08RN8W2MTJ?

The S9S08RN8W2MTJ supports a maximum bus frequency of 20 MHz across its full operating voltage range (2.7 V to 5.5 V) and temperature range (–40 °C to 125 °C). This frequency is achieved using the internal clock source (ICS) with FLL enabled and properly configured external or internal reference, as specified in the S9S08RN16 Series Data Sheet Rev 1 (02/2014). The S9S08RN8W2MTJ maintains timing compliance at this rate under worst-case conditions.

Does the S9S08RN8W2MTJ include hardware-based EEPROM error correction?

Yes, the S9S08RN8W2MTJ includes hardware-based ECC (Error Correction Code) for its 256-byte EEPROM. This feature detects and corrects single-bit errors during read operations and prevents data corruption due to radiation or wear-out effects. The EEPROM supports 2-byte erase sectors and allows program/erase operations while executing code from flash memory - a capability confirmed in the S9S08RN16 Series Data Sheet Section "On-chip memory".

What are the low-power modes available on the S9S08RN8W2MTJ?

The S9S08RN8W2MTJ supports multiple low-power modes including reduced-power wait mode and one dedicated low-power stop mode (Stop3). In Stop3 mode, the device consumes just 4.6 µA at 5 V while retaining RTC operation and 1 kHz LPO clock, with configurable wake sources including TSI, ADC, LVD, and external interrupts. Peripheral clocks can be selectively disabled via the peripheral clock enable register to further reduce current draw - details are provided in the "Power-saving modes" section of the official datasheet.

Is the S9S08RN8W2MTJ qualified for automotive applications?

Yes, the S9S08RN8W2MTJ is qualified for automotive applications under AEC-Q100 Grade 1 (–40 °C to 125 °C), with full characterization across that temperature range. It features integrated system protection including watchdog timer with independent clock source, programmable low-voltage detection with reset/interrupt, and illegal opcode/address detection - all essential for ASIL-B–capable systems. Its ESD rating (±6 kV HBM) and latch-up immunity (±100 mA) meet automotive robustness requirements per the S9S08RN16DS datasheet.

Can the S9S08RN8W2MTJ operate without an external crystal?

Yes, the S9S08RN8W2MTJ can operate without an external crystal using its internal clock source (ICS) with factory-trimmed reference oscillator. The ICS supports FLL-based multiplication to achieve up to 20 MHz bus frequency, with ±2% total deviation over –40 °C to 125 °C. External crystal is optional and only required when higher clock accuracy (e.g., for UART baud rate tolerance <2%) or specific timing stability is mandated - as documented in Section 6.1 of the S9S08RN16 Series Data Sheet.