NXP Semiconductors MC33FS8405G0KS

Overview

MC33FS8405G0KS from NXP Semiconductors is an ASIL B–capable automotive fail-safe system basis chip (SBC) integrating a VPRE synchronous buck controller, one low-voltage integrated synchronous BUCK1 converter (1.1 V / 3.6 A peak), two LDOs (1.8 V & 3.3 V / 400 mA each), and safety monitoring circuitry. It supports radar and vision ECUs requiring functional safety, EMC-optimized power sequencing, and SPI/I²C configuration.

For engineers reviewing the MC33FS8405G0KS datasheet, MC33FS8405G0KS pinout, MC33FS8405G0KS application, or MC33FS8405G0KS equivalent, key selection criteria include its ASIL B compliance, FCCU-enabled MCU monitoring, fail-safe output (FS0B), 60 V input tolerance, and OTP-programmable power-up sequencing for ADAS domain controllers.

Technical Context

The MC33FS8405G0KS implements a dual-domain safety architecture with independent monitoring logic, including a challenger watchdog, fault recovery, and configurable voltage supervision (VCOREMON, VMON1–VMON4) with programmable OV/UV thresholds and deglitch times. Its power management integrates a 455 kHz forced-PWM VPRE controller and a 2.22 MHz BUCK1 regulator with soft-start slope of 7.81 mV/µs.

It supports system-level EMC optimization via frequency synchronization (FIN/FOUT), spread spectrum, slew rate control, and manual tuning. The device uses OTP programming for fixed configurations and enables engineering-mode customization via NXP's GUI and socketed evaluation board-production OTP programming is restricted to NXP or authorized partners.

Key Specifications

Pinout & Package

MC33FS8405G0KS is housed in a HVQFN56 package (8 mm × 8 mm × 0.85 mm, 0.5 mm pitch, wettable flank KS variant), thermally enhanced with exposed pad (EP) tied to GNDFS/GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fail-safe power management applications.

Compared with MC33FS8405G0KS, MC33FS8410G0KS adds a third integrated buck without changing footprint or interface, while MC33FS8510A0KS upgrades safety certification and monitoring depth at the cost of higher qualification overhead and no BUCK3 - making MC33FS8405G0KS optimal for cost-sensitive ASIL B radar/vision nodes.

Availability

MC33FS8405G0KS is available at Aetrix Electronics and suitable for radar sensors, vision processing units, and ADAS domain controllers requiring stable component supply, long-term automotive qualification, and functional safety compliance.

Supply support for MC33FS8405G0KS 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The FS84 product line delivers ASIL B–certified system basis chips optimized for radar, vision, and infotainment ECUs - integrating power regulation, safety monitoring, and EMC-aware control in a single HVQFN package.

FAQ

What safety standard does the MC33FS8405G0KS comply with?

The MC33FS8405G0KS is developed in compliance with ISO 26262 for ASIL B applications and qualified per AEC-Q100 Grade 1 (−40 °C to +125 °C). It includes hardware-based safety mechanisms such as a challenger watchdog, fail-safe output (FS0B), and independent voltage supervision blocks (VCOREMON, VMON1–VMON4) with programmable thresholds and deglitch timers.

Does the MC33FS8405G0KS support multiple communication interfaces?

Yes, the MC33FS8405G0KS supports both 32-bit SPI and I²C interfaces with CRC protection. Its I²C address is fixed at 0x20, and SPI uses standard four-wire signaling (MISO/MOSI/SCLK/CSB). Both interfaces provide full register access for configuration, monitoring, and OTP emulation during development - though production OTP programming must be performed by NXP or authorized partners.

What is the role of the PSYNC pin on the MC33FS8405G0KS?

The PSYNC pin on the MC33FS8405G0KS serves as a bidirectional power synchronization interface. It allows two MC33FS8405G0KS devices-or one MC33FS8405G0KS and an external PMIC-to align their switching frequencies and phases, minimizing beat frequencies and improving system-level EMC performance. This feature is critical in multi-rail ADAS modules where ripple coupling between regulators must be minimized.

Can the MC33FS8405G0KS operate in ultra-low-power OFF mode?

Yes, the MC33FS8405G0KS supports an OFF mode with 10 µA typical quiescent current. In this state, the device retains wake-up capability via WAKE1 and WAKE2 inputs, enabling rapid resumption of power delivery to radar or vision SoCs upon CAN, LIN, or GPIO-triggered events - essential for always-on perception systems meeting UNECE R155 requirements.

How is voltage supervision implemented on the MC33FS8405G0KS?

Voltage supervision on the MC33FS8405G0KS is implemented through six dedicated analog inputs: VCOREMON (tied to BUCK1 output), VMON1–VMON4 (for external rail monitoring), and VDDIOMON (monitors LDO2 output). Each supports programmable overvoltage/undervoltage thresholds (e.g., ±12 %), deglitch times (5–45 µs), and fault response (shutdown + DFS or standalone shutdown), all configurable via OTP or runtime registers.