NXP Semiconductors MFS8623BMDA0ESR2

Overview

MFS8623BMDA0ES from NXP Semiconductors is a fail-safe system basis chip (SBC) designed for 12 V automotive battery networks, integrating a high-voltage buck controller (VPRE), low-voltage boost converter (BOOST), synchronous buck regulator (BUCK), two LDOs (LDO1/LDO2), and ten-channel voltage monitoring with ±1 % accuracy. It delivers ASIL B functional safety compliance, supports wake-up detection on two inputs, and enables power sequencing via XFAILB for domain controllers in ADAS and radar systems.

For engineers reviewing the MFS8623BMDA0ES datasheet, MFS8623BMDA0ES pinout, MFS8623BMDA0ES application, or MFS8623BMDA0ES equivalent, key selection criteria include its 36 V max input rating, OTP-configurable regulator outputs, I²C-based device control with CRC, fail-safe outputs (PGOOD/RSTB/FS0B), and thermal performance validated to 125 °C ambient.

Technical Context

The MFS8623BMDA0ES implements a leader/follower power-up sequencing architecture synchronized through the XFAILB pin, enabling cascaded SBC/PMIC coordination as a single safe power domain. Its analog multiplexer (AMUX) routes up to ten monitored voltages-including internal rails (VCORE, VPRE, BOOST) and external PMIC supplies-to a single MCU ADC input under I²C control.

Functional safety is enforced by independent voltage supervision circuitry, dual watchdog monitoring (simple/challenger via FCCU1/FCCU2), ERRMON for external IC failure detection, and built-in self-tests (LBIST/ABIST). Fail-safe outputs (PGOOD, RSTB, FS0B) incorporate latent fault detection and open-drain drivers rated for 36 V operation.

Key Specifications

Pinout & Package

Package: HPQFN48eP (48-pin wettable flank QFN with exposed thermal pad); optimized for automotive thermal cycling and reflow soldering reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MFS8623BMDA0ES, MFS8623BMBA0ES trades wettable flank reliability for lower cost in non-automotive use, while MFS8633BMDA0ES upgrades to ASIL D with ERRMON and challenger watchdog-making it suitable for higher-integrity radar or zonal ECU designs without changing PCB layout.

Availability

MFS8623BMDA0ES is available at Aetrix Electronics and suitable for ADAS domain controllers, automotive radar modules, and 12 V battery network ECUs requiring stable component supply, AEC-Q100 qualification, and ISO 26262 ASIL B compliance.

Supply support for MFS8623BMDA0ES 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 microcontrollers and power management.

The FS86 family-including MFS8623BMDA0ES-is engineered for scalable, fail-safe power management in automotive domain controllers, targeting ADAS, electrification, and radar systems with integrated safety, sequencing, and monitoring capabilities.

FAQ

What is the maximum input voltage rating for the MFS8623BMDA0ES?

The MFS8623BMDA0ES is rated for a maximum input voltage of 36 V DC on VSUP1 and VSUP2 pins, making it suitable for 12 V automotive battery networks including load-dump and cold-crank conditions. This rating is explicitly defined in Table 4 of the FS8600_SDS Rev. 3.0 and distinguishes it from the 60 V-rated FS86xx variants intended for 24 V systems. Exceeding 36 V may cause permanent damage.

Does the MFS8623BMDA0ES support fail-safe reset assertion for automotive MCUs?

Yes, the MFS8623BMDA0ES provides hardware reset assertion via the RSTB pin-an open-drain, 36 V-tolerant output that drives low during power-up, brown-out, or internal fault conditions. It also supports a programmable 10 ms release delay to align with MCU reset timing requirements, as specified in Section 2 of the FS8600_SDS. The RSTB signal is part of the dedicated safety outputs (PGOOD, RSTB, FS0B) with latent fault detection.

How many voltage rails can the MFS8623BMDA0ES monitor, and what is the accuracy?

The MFS8623BMDA0ES monitors up to ten voltage rails with ±1 % accuracy across its VMON0_I2C to VMON9_RES inputs. This includes internal regulators (VCORE, VPRE, BOOST) and external supplies via resistor bridges or DAC references. The specification is confirmed in Section 1 General description and Table 1 of the FS8600_SDS, enabling QM rail monitoring from non-NXP components for ASIL B system compliance.

Is the MFS8623BMDA0ES pin-compatible with other FS86 family members?

Yes, all FS86 devices-including MFS8623BMDA0ES-share the same HPQFN48eP package and pinout per Figure 3 and Table 3 of the FS8600_SDS. Pin-to-pin compatibility extends across ASIL B and ASIL D variants (e.g., MFS8633BMDA0ES), enabling hardware reuse. However, OTP configuration determines enabled features (e.g., ERRMON, FIN/VMON9 exclusivity), so firmware and safety configuration must be validated per part number.

What safety certifications does the MFS8623BMDA0ES hold?

The MFS8623BMDA0ES is developed in compliance with ISO 26262 up to ASIL B and qualified per AEC-Q100 Grade 1 (−40 °C to 125 °C ambient). It incorporates functional safety mechanisms including dual watchdog monitoring (FCCU1/FCCU2), ERRMON input, LBIST/ABIST, and fail-safe outputs with latent fault detection-all documented in Sections 2 and 6 of the FS8600_SDS Rev. 3.0.