NXP Semiconductors MC33FS8405G0ES

Overview

MC33FS8405G0ES 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 (LDO1/LDO2, each up to 400 mA), and safety monitoring circuitry. It supports radar and ADAS domain controller power architectures with external frequency synchronization, spread-spectrum EMC optimization, and OFF-mode quiescent current of 10 µA.

For engineers reviewing the MC33FS8405G0ES datasheet, MC33FS8405G0ES pinout, MC33FS8405G0ES application, or MC33FS8405G0ES equivalent, key selection criteria include its FS84-series OTP configuration with FCCU enabled, support for up to four voltage monitoring inputs (VMON1–VMON4), SPI/I²C interface with CRC, and fail-safe output (FS0B) for functional safety partitioning in ASIL B systems.

Technical Context

The MC33FS8405G0ES implements a dual-domain power management architecture: primary regulation via VPRE (external MOSFET controller) and BUCK1 (integrated core supply), plus analog supervision using VCOREMON, VDDIOMON, and four independent VMON inputs. Its safety subsystem includes a simple watchdog, PGOOD/RSTB assertion logic, and fail-safe state machine with deep fail-safe autoretry (infinite cycles).

It operates with 60 V DC max input across VSUP1/VSUP2 rails, supports power-up sequencing across six configurable slots, and enables system-level EMC control through FSYNC input/output, slew rate tuning, and manual frequency adjustment - all compliant with ISO 26262 ASIL B and AEC-Q100 Grade 1.

Key Specifications

Pinout & Package

MC33FS8405G0ES is housed in a HVQFN56 package (8 mm × 8 mm × 0.85 mm body, 0.5 mm pitch, wettable flank), with exposed thermal pad (EP) connected to GNDFS/GND. Pin count and function mapping align with the FS8405 device option per Table 1 - including enabled FCCU, four VMON inputs, and full BUCK1 + LDO1/LDO2 regulation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC33FS8410G0ES and MC33FS8500A0ES, MC33FS8405G0ES delivers optimal cost-performance balance for ASIL B radar and vision ECUs by omitting BUCK3 and ASIL D–specific safety hardware while retaining full FCCU, four VMON inputs, and fail-safe output functionality.

Availability

MC33FS8405G0ES is available at Aetrix Electronics and suitable for radar sensor modules, ADAS domain controllers, and vision camera ECUs requiring stable component supply, long-term automotive qualification, and functional safety compliance.

Supply support for MC33FS8405G0ES 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, with leadership in functional safety and automotive-grade power management.

The FS84 product line delivers ASIL B–certified system basis chips optimized for radar, vision, and ADAS domain controllers - integrating multiple SMPS, LDOs, safety monitoring, and EMC-optimized clocking in a single HVQFN package.

FAQ

What is the safety integrity level certified for MC33FS8405G0ES?

MC33FS8405G0ES is ASIL B–capable and developed in compliance with ISO 26262. It is qualified per AEC-Q100 Grade 1 and includes integrated safety features such as FCCU, fail-safe output (FS0B), and PGOOD/RSTB assertion logic - all validated for ASIL B system partitioning in radar and vision applications.

Does MC33FS8405G0ES support both SPI and I²C interfaces?

Yes, MC33FS8405G0ES supports both 32-bit SPI and I²C interfaces with CRC protection. The I²C address is fixed at 0x20, and SPI uses standard four-wire protocol (MISO/MOSI/SCLK/CSB). Both interfaces allow full register access for configuration, monitoring, and fault reporting during operation.

What are the key differences between MC33FS8405G0ES and MC33FS8410G0ES?

MC33FS8405G0ES includes BUCK1, dual LDOs, and FCCU, while MC33FS8410G0ES adds BUCK3 (1.8 V / 3.6 A). Both share ASIL B rating, four VMON inputs, and identical pinout/package. MC33FS8405G0ES is optimized for cost-sensitive radar/vision ECUs where only two regulated SMPS rails are required.

How does the fail-safe output (FS0B) behave during fault conditions?

FS0B is an active-low open-drain output that asserts low during detected faults - including overvoltage/undervoltage on monitored rails (VCOREMON, VMON1–VMON4), thermal shutdown, or safety state machine errors. It remains asserted until cleared by power cycle or safe recovery sequence, providing unambiguous fault signaling to external safety circuits.

Is MC33FS8405G0ES pin-compatible with other FS84/FS85 family members?

Yes, all FS84 and FS85 devices are pin-to-pin and software compatible per the datasheet. MC33FS8405G0ES shares identical HVQFN56 footprint and signal mapping with MC33FS8400G0ES, MC33FS8410G0ES, and MC33FS85xx variants - enabling scalable design reuse across ASIL B and ASIL D platforms.