NXP Semiconductors MFS8621BMDA0ESR2

Overview

MFS8621BMDA0ES from NXP Semiconductors is a fail-safe system basis chip (SBC) designed for automotive domain controllers requiring ASIL D compliance, integrated power management, and functional safety monitoring. It delivers 15 A VPRE buck controller output, dual LDOs (400 mA each), 2.5 A BUCK, 1 A BOOST, ±1 % voltage monitoring across 10 inputs, and operates in 12 V battery networks up to 36 V.

For engineers reviewing the MFS8621BMDA0ES datasheet, MFS8621BMDA0ES pinout, MFS8621BMDA0ES application, or MFS8621BMDA0ES equivalent, this device supports critical ADAS radar and electrification systems where synchronized power sequencing, fault detection via PGOOD/RSTB/FS0B, and I²C-configurable regulators are required.

Technical Context

The MFS8621BMDA0ES implements a leader/follower power-up sequencing architecture via XFAILB, enabling cascaded SBC synchronization within the BYLink platform. Its fail-safe state machine independently monitors ten voltage rails-including external PMIC outputs-with dedicated analog multiplexer (AMUX) and configurable VMONx inputs.

It integrates three switching regulators (VPRE controller with e-fuse protection, BOOST, BUCK) and two LDOs, all managed through a 32-bit I²C interface with 8-bit CRC. Safety features include logical/analogue BIST (LBIST/ABIST), MCU failure monitoring via FCCU1/FCCU2, and ERRMON-based external IC fault detection.

Key Specifications

Pinout & Package

Package: HPQFN48eP (48-pin QFN with exposed pad, wettable flanks, thermally enhanced).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MFS8621BMDA0ES, MFS8623BMDA0ES adds BOOST functionality for auxiliary 5–6 V generation, while MFS8633BMDA0ES enables external IC failure monitoring and enhanced watchdog modes-both retain pin-to-pin compatibility and identical thermal/power specs for drop-in evaluation.

Availability

MFS8621BMDA0ES is available at Aetrix Electronics and suitable for ADAS radar domain controllers, electrified powertrain gateways, and commercial vehicle infotainment systems requiring stable component supply, long-term automotive qualification, and ASIL D functional safety certification.

Supply support for MFS8621BMDA0ES 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 automotive MCUs and power management.

The FS86 family-including MFS8621BMDA0ES-is engineered for domain controller architectures in ADAS, radar, and vehicle electrification, delivering scalable ASIL B–D power and safety integration with BYLink synchronization.

FAQ

What is the maximum input voltage supported by MFS8621BMDA0ES?

MFS8621BMDA0ES supports a maximum input voltage of 36 V DC, specifically qualified for 12 V battery network applications. This rating applies to both VSUP1 and VSUP2 pins, and external reverse-battery protection diodes are mandatory per the datasheet. The device operates down to 4.5 V battery voltage when VPRE is configured to 3.3 V, making it suitable for cold-crank scenarios in automotive environments. MFS8621BMDA0ES does not support 60 V operation-that is reserved for FS86xx parts designated for 24 V networks.

Does MFS8621BMDA0ES include BOOST converter functionality?

No, MFS8621BMDA0ES does not include the BOOST converter. Per Table 1 in the FS8600_SDS, the "FS8621" variant is defined as having VPRE, BUCK, and two LDOs-but no BOOST. This is confirmed by ordering information showing MFS8621BMDA0ES belongs to the FS862x series for 12 V networks without BOOST. For BOOST capability, MFS8623BMDA0ES or MFS8633BMDA0ES must be selected. MFS8621BMDA0ES retains full compatibility with those variants' pinout and software stack.

How many voltage monitoring inputs does MFS8621BMDA0ES support, and what is their accuracy?

MFS8621BMDA0ES supports up to 10 voltage monitoring inputs (VMON0 through VMON9), with a target accuracy of ±1 % across all channels. This includes VMON0_I2C (for FIN/AMUX/I²C supply), three DAC-coupled inputs (VMON1–VMON3), one internal resistor bridge input (VMON4_RINT), and five external resistor bridge inputs (VMON5–VMON9_RES). The ±1 % accuracy enables reliable supervision of QM rails from non-NXP components, satisfying ASIL D diagnostic coverage requirements without external precision references. MFS8621BMDA0ES implements this using dedicated analog monitoring circuitry independent of the main power management state machine.

What package type and thermal performance does MFS8621BMDA0ES use?

MFS8621BMDA0ES uses the HPQFN48eP package: a 48-pin plastic thermally enhanced very thin quad flat package with wettable flanks and an exposed pad. Its thermal resistance is rated at RθJA = 23 °C/W (2s6p layout) and RθJB = 10 °C/W, enabling efficient heat dissipation in high-power automotive applications. The exposed pad must be soldered to a solid GND plane for optimal performance. This package supports −40 °C to 125 °C ambient operation and meets AEC-Q100 Grade 1 requirements. MFS8621BMDA0ES leverages this thermal design to sustain 15 A VPRE output without derating under typical chassis conditions.

Is MFS8621BMDA0ES pin-to-pin compatible with other FS86 family members?

Yes, MFS8621BMDA0ES is pin-to-pin compatible with all FS86xx devices in the HPQFN48eP package, including MFS8620BMDA0ES, MFS8622BMDA0ES, MFS8623BMDA0ES, and MFS8633BMDA0ES. Pin configuration, power domains, safety outputs (PGOOD/RSTB/FS0B), and I²C interface are identical across the family. Functional differences-such as presence of BOOST or ERRMON-are implemented via OTP programming and do not affect physical layout. This allows hardware reuse across ASIL B and ASIL D designs, with MFS8621BMDA0ES serving as the base variant for 12 V networks without BOOST or ERRMON.