NXP Semiconductors MC9S08PA4VWJ

Overview

MC9S08PA4VWJ 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 at 2.7–5.5 V. It integrates an 8-channel 12-bit ADC, three 2-channel FlexTimer modules, SCI/UART with LIN support, RTC, and analog comparator-designed for cost-sensitive industrial control and sensor interface applications.

For engineers reviewing the MC9S08PA4VWJ datasheet, MC9S08PA4VWJ pinout, MC9S08PA4VWJ application, or MC9S08PA4VWJ equivalent, this page delivers verified electrical specs, package mapping to 20-pin SOIC, validated peripheral timing, real-world use cases in motor control and battery monitoring, and two confirmed alternative parts with documented functional and packaging differences.

Technical Context

The MC9S08PA4VWJ implements an S08 CPU core with four-level nested interrupt handling and up to 40 interrupt/reset sources. Its clock system combines a Pierce external oscillator (31.25 kHz–20 MHz) and an internal clock source (ICS) with FLL-based frequency multiplication and factory-trimmed internal reference (±1% over 0–70 °C).

System protection includes independent watchdog with dedicated 1 kHz oscillator, selectable low-voltage detect/warning thresholds (e.g., VLVDH = 4.2–4.4 V), illegal opcode/address detection, and flash/RAM access protection. Power management supports Stop3 mode with <1.5 µA supply current and peripheral clock gating.

Key Specifications

Pinout & Package

MC9S08PA4VWJ is packaged in a 20-pin SOIC (package code VWJ), with 18 GPIOs, one output-only pin (PTA4), and dedicated debug (BKGD), reset (IRQ), oscillator (EXTAL/XTAL), and power (VDD/VSS/VDDA/VSSA) terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08PA4VWJ, MC9S08PA8VWJ offers double flash capacity with zero hardware change, while S9KEAZ128AMLH provides scalable 32-bit performance at the cost of full board rework-making the former ideal for incremental upgrades and the latter for next-generation designs.

Availability

MC9S08PA4VWJ is available at Aetrix Electronics and suitable for industrial motor control, battery-powered sensor nodes, automotive body electronics, and home appliance UI systems requiring stable component supply and long-term lifecycle support.

Supply support for MC9S08PA4VWJ 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 markets, with deep expertise in microcontrollers and mixed-signal integration.

The MC9S08PA series targets cost-optimized, low-power embedded control applications-delivering robust analog integration, flexible clocking, and industrial-grade reliability in compact packages.

FAQ

What is the maximum operating frequency of the MC9S08PA4VWJ?

The MC9S08PA4VWJ 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/resonator up to 20 MHz. The actual core instruction throughput is derived from this bus clock, with typical execution at 10 million instructions per second (MIPS) at 20 MHz bus speed. MC9S08PA4VWJ maintains timing compliance under all specified conditions without derating.

Does the MC9S08PA4VWJ support in-circuit debugging?

Yes, the MC9S08PA4VWJ includes a single-wire background debug (BDM) interface accessible via the PTA4/BKGD pin. It supports full in-circuit emulation with three hardware breakpoints, on-chip debug module (DBG) with two comparators and nine trigger modes, and real-time trace capabilities. No external debugger hardware is required beyond a standard BDM pod, and the interface remains functional even in low-power Stop3 mode for controlled wake-up debugging. MC9S08PA4VWJ's BDM implementation is fully compliant with NXP's HCS08 debug specification.

What are the key power-saving features of the MC9S08PA4VWJ?

The MC9S08PA4VWJ offers multiple low-power modes: Wait mode (3.62 mA typical at 20 MHz/5 V), Stop3 mode (1.5 µA typical at 5 V with 1 kHz LPO active), and peripheral clock gating via the SIM module. In Stop3, RTC, ADC, ACMP, and KBI can generate wake-up events while main clocks are halted. The device also supports dynamic bus frequency scaling and voltage regulation down to 2.7 V, enabling energy optimization across diverse operating profiles. MC9S08PA4VWJ's power architecture is validated per Table 5 in the official datasheet Rev. 10.

Which analog peripherals are integrated into the MC9S08PA4VWJ?

The MC9S08PA4VWJ integrates an 8-channel, 12-bit successive-approximation ADC with 2.5 µs conversion time, internal bandgap reference, data buffering with watermark interrupt, and hardware-triggered operation-including in Stop3 mode. It also includes a single analog comparator (ACMP) with independently configurable rising/falling edge interrupts and filtering. Both peripherals share dedicated analog supply pins (VDDA/VSSA) and are electrically characterized per Tables 7.3.1 and 7.3.2 in the MC9S08PA4 datasheet Rev. 10. MC9S08PA4VWJ does not include DAC or op-amps.

Is the MC9S08PA4VWJ pin-compatible with other members of the PA family?

Yes, the MC9S08PA4VWJ is pin-compatible with other 20-pin SOIC variants in the MC9S08PA family, including MC9S08PA8VWJ and MC9S08PA16VWJ. All share identical pin assignments, electrical characteristics, and peripheral mappings-differing only in flash size (4 KB, 8 KB, 16 KB) and associated memory-related fuse settings. This allows seamless firmware upgrades without hardware modification. MC9S08PA4VWJ's pinout is documented in Section 9.2 of the datasheet Rev. 10 and matches the 20-pin SOIC footprint defined in Table 1.