NXP Semiconductors MC33FS8510D3KSR2

Overview

MC33FS8510D3KSR2 from NXP Semiconductors is an ASIL D–compliant automotive fail-safe system basis chip (SBC) integrating a VPRE synchronous buck controller, three low-voltage synchronous buck converters (BUCK1/BUCK2/BUCK3), one boost converter, and two LDOs. It delivers 1.3 V @ 2.6 A (BUCK1), 3.3 V @ 2.6 A (BUCK3), 5.0 V @ 150 mA (LDO1), and 5.0 V @ 150 mA (LDO2), with integrated safety monitoring for radar and battery monitoring systems.

For engineers reviewing the MC33FS8510D3KSR2 datasheet, MC33FS8510D3KSR2 pinout, MC33FS8510D3KSR2 application, or MC33FS8510D3KSR2 equivalent, this device supports SPI/I²C configuration, fail-safe output (FS0B), power synchronization (PSYNC), and voltage supervision across six analog monitor inputs (VMON1–VMON4, VCOREMON, VDDIOMON) - critical for functional safety validation in 24 V battery monitoring systems.

Technical Context

The MC33FS8510D3KSR2 implements a dual-domain safety architecture with independent monitoring circuitry, challenger watchdog, and built-in self-test (ABIST/LBIST). Its fail-safe state machine asserts FS0B on detected faults including overvoltage (OVTH = 110 %), undervoltage (UVTH = 90 %), and thermal shutdown (TSD), with configurable delay times (OV_DGLT = 45 µs, UV_DGLT = 40 µs).

It supports deterministic power-up sequencing across seven slots, with BUCK1 starting in Slot 0, BUCK3 in Slot 1, LDO1 in Slot 2, LDO2 in Slot 3, and VMON supervision in Slot 2–3. The device uses 2.22 MHz fixed-frequency PWM for BUCK1/BUCK2/BUCK3 and 455 kHz forced-PWM for VPRE, enabling EMC-optimized multi-device synchronization via FIN/FOUT and PSYNC pins.

Key Specifications

Pinout & Package

MC33FS8510D3KSR2 is housed in a HVQFN56 package (8 mm × 8 mm × 0.85 mm, 0.5 mm pitch, wettable flank), with exposed thermal pad (EP) connected to GNDFS/GND. Pin count is 56, including 42 active signal terminals and 14 GND/EP connections.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive SBC applications.

Compared with MC33FS8510A2KSR2 and MC33FS8520A0KSR2, the MC33FS8510D3KSR2 trades BUCK2 and higher LDO current for enhanced analog monitoring (VMON3/VMON4) and optimized sequencing for battery monitoring - making it uniquely suited for high-integrity 24 V BMS applications where rail supervision outweighs multi-rail density.

Availability

MC33FS8510D3KSR2 is available at Aetrix Electronics and suitable for battery monitoring systems, radar domain controllers, and ADAS gateway designs requiring stable component supply, long-term automotive qualification, and ASIL D functional safety compliance.

Supply support for MC33FS8510D3KSR2 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 radar processing technology.

The MC33FS8510D3KSR2 belongs to NXP's FS85 family of fail-safe system basis chips, engineered specifically for ASIL D–compliant power management in next-generation automotive radar, battery monitoring, and domain controller systems.

FAQ

What is the primary safety certification level of the MC33FS8510D3KSR2?

The MC33FS8510D3KSR2 is certified to ASIL D per ISO 26262 and qualified to AEC-Q100 Grade 1 (−40 °C to +125 °C). Its safety architecture includes independent monitoring circuitry, challenger watchdog, ABIST/LBIST, and fail-safe output (FS0B) that asserts on detected overvoltage, undervoltage, or thermal faults - all verified through NXP's ASIL D development process.

Which power rails does the MC33FS8510D3KSR2 generate and what are their key settings?

The MC33FS8510D3KSR2 generates BUCK1 (1.3 V @ 2.6 A), BUCK3 (3.3 V @ 2.6 A), LDO1 (5.0 V @ 150 mA), and LDO2 (5.0 V @ 150 mA). BUCK1 starts in Power Sequencing Slot 0, BUCK3 in Slot 1, and both LDOs in Slots 2 and 3. All outputs feature soft-start (7.81–10.41 mV/µs), current limiting, and thermal shutdown behavior documented in the FS84_FS85C datasheet Rev. 12.0.

How does the MC33FS8510D3KSR2 support functional safety monitoring in battery monitoring applications?

The MC33FS8510D3KSR2 supports functional safety monitoring via six dedicated analog inputs: VCOREMON (BUCK1 output), VDDIOMON (LDO2 output), and VMON1–VMON4 (external rails). Each monitors overvoltage (OVTH = 110 %) and undervoltage (UVTH = 90 %) with configurable deglitch timing (OV_DGLT = 45 µs, UV_DGLT = 40 µs), feeding into the fail-safe state machine that asserts FS0B within microseconds of fault detection.

Can the MC33FS8510D3KSR2 be used in 24 V automotive systems, and what protections are required?

Yes, the MC33FS8510D3KSR2 supports 24 V automotive systems with a 60 V DC maximum input rating. External reverse-battery protection diodes are mandatory on both VSUP1 and VSUP2 pins per the datasheet. The device also includes internal overvoltage clamping and thermal shutdown (TSD), and its ASIL D safety architecture ensures fault detection and fail-safe response even under harsh 24 V transient conditions.

What communication interfaces does the MC33FS8510D3KSR2 support and how are they configured?

The MC33FS8510D3KSR2 supports both SPI and I²C interfaces, with I²C address fixed at 0x20. Communication is CRC-protected and accessed via dedicated pins (SCLK/MOSI/MISO/CSB for SPI; SCL/SDA for I²C). Configuration is performed during initialization using OTP-programmed settings - no runtime register writes are needed for basic operation, though diagnostics and monitoring can be read dynamically via either interface.