NXP Semiconductors MC9S08PA4AVWJ

Overview

MC9S08PA4AVWJ from NXP Semiconductors is an 8-bit S08 microcontroller with 4 KB flash, 512 byte RAM, and 128 byte EEPROM, operating up to 20 MHz across –40°C to +105°C. It integrates ADC, FTM timers, SCI/UART, RTC, analog comparator, and keyboard interrupt module - deployed in automotive body control modules, industrial sensor nodes, and low-power embedded controllers.

For engineers reviewing the MC9S08PA4AVWJ datasheet, MC9S08PA4AVWJ pinout, MC9S08PA4AVWJ application, or MC9S08PA4AVWJ equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options for design-in and supply continuity.

Technical Context

The MC9S08PA4AVWJ implements an S08 CPU core with four-level nested interrupt support and up to 40 interrupt/reset sources. Its clock system combines a 31.25 kHz–20 MHz external oscillator (XOSC) and an internal clock source (ICS) with FLL, enabling precise 1% internal reference accuracy over 0°C–70°C.

System protection includes independent watchdog timing, selectable low-voltage detect (LVD) thresholds (2.56 V–4.4 V), illegal opcode/address detection, and flash/RAM access protection. Power management supports Stop3 mode with <1.5 µA typical current and peripheral clock gating.

Key Specifications

Pinout & Package

MC9S08PA4AVWJ is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 0.3 inch body width and standard 1.27 mm pitch. Pin assignments are validated per NXP Document Number MC9S08PA4 Rev. 10 (03/2020), Section 9.2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08PA4AVWJ, MC9S08PA8AVWJ offers drop-in memory expansion while preserving all timing, I/O, and debug compatibility; S9KEAZ128AMLH provides architectural upgrade path but requires PCB redesign, firmware rewrite, and new qualification effort.

Availability

MC9S08PA4AVWJ is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and smart appliance interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC9S08PA4AVWJ 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 markets, with deep expertise in microcontrollers and analog integration.

The MC9S08PA series targets cost-sensitive, low-power embedded control applications - designed for robust operation in harsh environments with integrated analog peripherals and debug infrastructure.

FAQ

What is the maximum operating frequency of the MC9S08PA4AVWJ?

The MC9S08PA4AVWJ 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 +105°C). This frequency is achievable using either the internal clock source (ICS) with FLL or an external crystal/resonator up to 20 MHz. The MC9S08PA4AVWJ maintains timing compliance under worst-case conditions per NXP Rev. 10 datasheet Table 7.

Does the MC9S08PA4AVWJ support in-circuit debugging?

Yes, the MC9S08PA4AVWJ includes a single-wire background debug interface (BKGD) with three hardware breakpoints and an on-chip in-circuit emulator (ICE) module featuring two comparators and nine trigger modes. This enables full visibility into program flow, register states, and memory during live operation without requiring dedicated debug pins beyond BKGD/MS.

What are the key low-power modes supported by the MC9S08PA4AVWJ?

The MC9S08PA4AVWJ supports multiple low-power states including Wait mode (3.62 mA typical at 20 MHz) and Stop3 mode (1.5 µA typical). In Stop3, only the 1 kHz LPO clock remains active, yet RTC, LVD, and ADC can operate - enabling wake-up on timer expiry, voltage threshold breach, or analog event. Peripheral clocks can be individually gated to further reduce current.

Which pins on the MC9S08PA4AVWJ support 20 mA drive strength?

PTB4 and PTB5 are the two ultra-high current sink/source pins on the MC9S08PA4AVWJ, each capable of delivering or sinking up to 20 mA. These pins are designated for direct driving of LEDs, relays, or small solenoids without external buffers. Their drive capability is validated in NXP datasheet Table 3 under "High current drive pins" with VOL ≤ 0.8 V at 20 mA load.

Is the MC9S08PA4AVWJ pin-compatible with other PA-series variants?

Yes, the MC9S08PA4AVWJ in 20-pin SOIC (WJ) package shares identical pinout with MC9S08PA8AVWJ and MC9S08PA16AVWJ. All share the same signal multiplexing, electrical characteristics, and mechanical footprint - enabling memory-scaling upgrades without layout changes. This compatibility is confirmed in NXP's MC9S08PA4 datasheet Table 1 and Section 3.3.