NXP Semiconductors MC9S08PB8VTJ

Overview

MC9S08PB8VTJ from NXP Semiconductors is an 8-bit S08 microcontroller with 8 KB flash, 1 KB RAM, and integrated peripherals including a 12-channel 12-bit ADC, two analog comparators, one operational amplifier, dual flex timer modules (FTM0 and FTM2), SCI/I2C/UART interfaces, real-time clock (RTC), and fault detection shutdown (FDS). It operates up to 20 MHz across 2.7–5.5 V and –40 °C to +105 °C, targeting embedded control in industrial sensors and motor drive subsystems.

For engineers reviewing the MC9S08PB8VTJ datasheet, MC9S08PB8VTJ pinout, MC9S08PB8VTJ application, or MC9S08PB8VTJ equivalent, key selection criteria include its 20-pin TSSOP package, 8 KB flash memory size, support for stop3 low-power mode with sub-µA current, integrated 1 kHz LPO oscillator, and hardware-triggered ADC with FIFO-critical for deterministic timing in battery-powered edge nodes.

Technical Context

The MC9S08PB8VTJ implements an enhanced HCS08 CPU core with four-level nested interrupt handling and up to 30 interrupt/reset sources. Its internal clock source (ICS) uses a frequency-locked loop (FLL) with factory-trimmed internal reference (±0.2% resolution, ±1% deviation over 0–70 °C), enabling stable bus operation without external crystal when paired with the 31.25 kHz–20 MHz XOSC module.

Peripheral integration includes dual FTM modules (FTM0: 2-channel; FTM2: 6-channel), each supporting input capture, output compare, and PWM modes; an ADC with 2.5 µs conversion time, eight-level FIFO, and optional hardware trigger; and FDS logic that forces configurable output states (0, 1, or high-Z) upon fault detection-enabling safe shutdown in motor control and power management applications.

Key Specifications

Pinout & Package

MC9S08PB8VTJ is housed in a 20-pin Thin Shrink Small Outline Package (TSSOP) with 0.65 mm lead pitch, optimized for compact industrial PCB layouts and reflow-compatible assembly. Thermal resistance is 116 °C/W (single-layer board) and 76 °C/W (four-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08PB16VTJ, the MC9S08PB8VTJ offers identical peripheral set and pin compatibility at lower memory cost-ideal for fixed-function control where code footprint stays under 8 KB. Versus S9KEAZ128AMLH, it avoids ARM toolchain complexity and delivers deterministic real-time latency suited to hard real-time loops below 20 MHz.

Availability

MC9S08PB8VTJ is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, energy metering subsystems, and PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC9S08PB8VTJ 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in microcontrollers and mixed-signal integration.

The MC9S08PB series targets cost-sensitive, reliability-critical embedded control applications-designed for industrial automation, appliance control, and motor drive subsystems where robustness, low-power operation, and integrated analog peripherals are essential.

FAQ

What is the maximum operating frequency of the MC9S08PB8VTJ?

The MC9S08PB8VTJ supports a maximum bus frequency of 20 MHz across its full operating voltage range (2.7–5.5 V) and temperature range (–40 °C to +105 °C). This is achieved using either the internal clock source (ICS) with FLL or an external crystal/ceramic resonator via the XOSC module. The 20 MHz limit applies to both flash and RAM execution modes, with timing validated per Table 7 in the datasheet.

Does the MC9S08PB8VTJ support hardware debugging during development?

Yes, the MC9S08PB8VTJ includes a single-wire background debug interface (BDM) with on-chip in-circuit emulator (ICE) functionality. It supports up to three breakpoints, nine trigger modes, and real-time register/memory access-enabling full in-circuit debugging without requiring additional debug headers or pins beyond the BKGD/MS pin (PTA4). This reduces PCB complexity versus multi-pin JTAG solutions.

How many ADC channels does the MC9S08PB8VTJ have, and what is their resolution?

The MC9S08PB8VTJ integrates a 12-channel, 12-bit successive approximation ADC with 2.5 µs conversion time, eight-level data FIFO, and optional hardware triggering. All 12 channels are accessible via dedicated ADPn pins (ADP0–ADP11), and the module supports operation in stop3 mode-allowing low-power periodic sampling without waking the CPU core.

What low-power modes are available on the MC9S08PB8VTJ?

The MC9S08PB8VTJ offers multiple low-power modes: reduced-power wait mode and stop3 mode. In stop3 mode, all clocks halt except the 1 kHz low-power oscillator (LPO), achieving ≤1.3 µA typical supply current at 5 V. Wake-up sources include RTC alarm, keyboard interrupt (KBI), comparator output, or external pin interrupt-making it suitable for battery-operated sensing applications.

Is the MC9S08PB8VTJ pin-compatible with other members of the PB family?

Yes, the MC9S08PB8VTJ is pin-compatible with the MC9S08PB16VTJ-both use the 20-pin TSSOP (VTJ) package and share identical pin assignments and multiplexing. This allows direct substitution where firmware fits within 8 KB flash, or seamless migration to 16 KB flash for feature expansion without PCB redesign.