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NXP Semiconductors MFS8631BMDA0ESR2
- Part No.:
- MFS8631BMDA0ESR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
MFS8631BMDA0ESR2.pdf
- Description:
- SAFETY SYSTEM BASIS CHIP FOR DOM
- Quantity:
- Payment:
- Shipping:
Inventory:2,540
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Product details
Overview
MFS8631BMDA0ES from NXP Semiconductors is a fail-safe system basis chip (SBC) designed for automotive domain controllers, integrating multiple SMPSs and LDOs with ASIL D functional safety compliance. It delivers 15 A VPRE buck output, 2.5 A BUCK, 1 A BOOST, dual 400 mA LDOs, and monitors ten voltages at ±1 % accuracy for QM rail supervision in ADAS and radar systems.
For engineers reviewing the MFS8631BMDA0ES datasheet, MFS8631BMDA0ES pinout, MFS8631BMDA0ES application, or MFS8631BMDA0ES equivalent, this page provides verified technical context, safety-critical power sequencing details, voltage monitoring configuration, and validated alternative options for 12 V battery network (36 V max) domain controller designs.
Technical Context
The MFS8631BMDA0ES implements a leader/follower power-up sequencing architecture via XFAILB, enabling synchronized startup across cascaded SBCs in BYLink platform designs. Its fail-safe state machine manages PGOOD, RSTB, and FS0B outputs with latent fault detection and supports both simple and challenger watchdog monitoring via FCCU1/FCCU2 inputs.
It integrates an analog multiplexer (AMUX) for MCU ADC-based system voltage monitoring, configurable I²C interface with 8-bit CRC, and OTP-programmable features including FIN/VMON9_RES pin multiplexing and FOUT function selection - all qualified to AEC-Q100 Grade 1 (−40 °C to 125 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 36 V max for 12 V battery networks; supports down to 4.5 V with VPRE = 3.3 V - enables robust operation in automotive stop-start conditions. |
| VPRE Output | Configurable 3.3–5.0 V, up to 15 A DC with e-fuse protection - powers high-current MCU cores or external FETs in domain controllers. |
| BUCK Output | Configurable 1.0–3.3 V, up to 2.5 A DC - supplies core logic rails for radar SoCs or vision processors. |
| BOOST Output | Configurable 5–6 V, up to 1 A DC - powers CAN transceivers or sensor interfaces requiring >5 V bias. |
| LDO1/LDO2 | Each configurable 1.1–5.0 V, up to 400 mA DC with load switch capability - supports MCU I/O, peripherals, and isolated power domains. |
| Voltage Monitoring | 10 inputs with ±1 % accuracy - enables QM rail supervision of non-NXP PMICs and external regulators in ASIL-compliant systems. |
| Functional Safety | ASIL D compliant per ISO 26262; includes LBIST/ABIST, ERRMON, PWM monitoring (FCCU), and dedicated safety outputs (PGOOD/RSTB/FS0B). |
| Package | HPQFN48eP (48-pin wettable flank QFN with exposed pad) - optimized thermal resistance (RθJB = 10 °C/W, 2s6p) for automotive under-hood environments. |
Pinout & Package
Package: HPQFN48eP - 7 mm × 7 mm, 0.4 mm pitch, thermally enhanced plastic QFN with wettable flanks and exposed pad soldered to GND for optimal thermal performance in automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LDO1 / LDO2 | Analog output | Dual independent LDO outputs supporting configurable voltage (1.1–5.0 V) and 400 mA load - used for MCU I/O banks and peripheral power domains. |
| VPRE_SW / PRE_GHS / PRE_GLS | Analog output | Switching node and gate drivers for external high-voltage buck FETs - enables 15 A VPRE regulation with e-fuse shutdown capability. |
| BUCK_SW / BUCK_FB | Analog output/input | Integrated synchronous buck switching node and feedback input - delivers 2.5 A regulated core voltage with tight loop control. |
| VMON0_I2C to VMON9_RES | Analog input | Ten voltage monitoring inputs (±1 % accuracy); VMON0–3 use DAC sensing, VMON4–9 use resistor bridge - supports full-system rail supervision including external PMICs. |
| XFAILB | Digital I/O | Power synchronization interface for leader/follower sequencing with other NXP low-voltage PMICs - ensures deterministic power-up order across multi-chip power systems. |
| PGOOD / RSTB / FS0B | Digital output | Fail-safe outputs with latent fault detection: PGOOD confirms stable regulation; RSTB resets MCU; FS0B signals safe-state violation - critical for ASIL D diagnostics. |
Key Features
| Feature | Design Value |
|---|---|
| BYLink Platform Integration | Enables synchronized power sequencing and safety coordination across cascaded SBCs - reduces system-level timing margin uncertainty in domain controller clusters. |
| 10-Voltage Monitoring | ±1 % accuracy across all ten VMON inputs - allows QM rail supervision of third-party regulators without additional external ADCs or supervisors. |
| Configurable Fail-Safe Outputs | PGOOD, RSTB, and FS0B include latent fault detection and diagnostic reporting via I²C - satisfies ASIL D diagnostic coverage requirements for safety-critical reset and status signaling. |
| OTP-Programmable Pin Functions | FIN/VMON9_RES pin multiplexing and FOUT mode selection via one-time programmable memory - enables hardware reuse across variants without PCB changes. |
| EMC-Optimized Regulators | Spread spectrum, slew rate control, and manual frequency tuning on all SMPSs - meets FMC1278 radiated emission and IEC 62132-4 conducted immunity standards for automotive EMI compliance. |
| Thermal Performance | RθJB = 10 °C/W (2s6p) with exposed pad connected to GND - sustains full 15 A VPRE output in 125 °C ambient without derating in compact domain controller layouts. |
Applications
| ADAS Domain Controller | Radar Processing Unit |
|---|---|
Use Scenario: Centralized power management for multi-MCU ADAS domain controllers handling sensor fusion, path planning, and actuator control. IC Role / Device Role / Timing Role: Primary system basis chip providing sequenced VPRE (15 A), BUCK (2.5 A), BOOST (1 A), and dual LDOs (400 mA each) while supervising all rail voltages. Use Value: Enables single-chip power + safety architecture meeting ASIL D requirements without external supervisors or discrete sequencing logic. |
Use Scenario: Power delivery and safety monitoring for 77 GHz radar SoCs requiring precise core, I/O, and analog supply rails with fast fault response. IC Role / Device Role / Timing Role: Supplies VCORE (1.0–1.2 V @ 2.5 A), I/O (3.3 V @ 400 mA), and RF bias (5.5 V @ 1 A) while monitoring 10+ internal and external rails at ±1 %. Use Value: Eliminates need for separate voltage supervisors and reduces BOM count by integrating fail-safe outputs and watchdog interfaces. |
| Vision Camera Module | 12 V Automotive Gateway |
Use Scenario: Compact mono/stereo camera ECU with image sensor, ISP, and communication interface requiring low-noise, tightly regulated supplies. IC Role / Device Role / Timing Role: Delivers clean 1.8 V (BUCK), 2.8 V (LDO1), and 3.3 V (LDO2) rails with <1 % ripple and monitors sensor bias, ISP core, and PHY voltages. Use Value: Integrated AMUX and I²C interface allow MCU ADC to monitor all rails without external multiplexers or ADCs - saving board space and cost. |
Use Scenario: In-vehicle gateway managing CAN FD, Ethernet, and LIN communication between domains, requiring robust 12 V network compatibility and wake-on-CAN support. IC Role / Device Role / Timing Role: Provides 36 V tolerant wake-up inputs (WAKE1/WAKE2), 5 V BOOST for transceivers, and failsafe RSTB/FS0B signaling during bus error events. Use Value: 36 V max input rating and ±8 kV ESD protection on VSUP/WAKE pins ensure reliable operation in harsh 12 V vehicle electrical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fail-safe SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MFS8633BMDA0ES | Includes ERRMON input and full 10-VMON support enabled; same package and pinout. | Required when external IC failure monitoring (e.g., companion PMIC fault reporting) is needed alongside full rail supervision. | Select MFS8633BMDA0ES if ERRMON functionality is mandatory; otherwise MFS8631BMDA0ES offers identical power and safety features at lower OTP complexity. |
| MFS8623BMBA0ES | ASIL B rated (not ASIL D); same 36 V input, 15 A VPRE, and 10-VMON capability but reduced diagnostic coverage. | Suitable for cost-sensitive ASIL B subsystems where challenger watchdog and full ABIST/LBIST are not required. | Choose MFS8623BMBA0ES only for ASIL B applications; MFS8631BMDA0ES is required for ASIL D compliance in domain controllers and radar units. |
Compared with MFS8633BMDA0ES, MFS8631BMDA0ES omits ERRMON but retains identical ASIL D safety mechanisms and power specs - making it optimal for domain controllers without external IC monitoring needs. Against MFS8623BMBA0ES, it adds challenger watchdog and full diagnostic coverage essential for ASIL D deployment.
Availability
MFS8631BMDA0ES is available at Aetrix Electronics and suitable for ADAS domain controllers, radar processing units, and 12 V automotive gateways requiring stable component supply, long-term automotive qualification, and ASIL D functional safety certification.
Supply support for MFS8631BMDA0ES 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 MFS8631BMDA0ES - was developed to address scalable, fail-safe power and safety requirements in automotive domain controllers, supporting ASIL B to ASIL D systems through integrated SMPSs, LDOs, and ISO 26262-compliant diagnostics.
FAQ
What is the maximum input voltage rating for MFS8631BMDA0ES?
MFS8631BMDA0ES is rated for 36 V maximum input voltage on VSUP1/VSUP2 pins, making it suitable for 12 V battery network automotive applications. This rating includes transient tolerance up to −1.0 V to +36 V on WAKE1/WAKE2 pins with external series resistors, and ±8 kV ESD protection on key power and wake inputs per ISO10605.
Does MFS8631BMDA0ES support ASIL D compliance?
Yes, MFS8631BMDA0ES is developed in compliance with ISO 26262 and qualified to AEC-Q100 Grade 1 (−40 °C to 125 °C). It achieves ASIL D through integrated LBIST/ABIST, challenger watchdog monitoring (FCCU1/FCCU2), ERRMON-capable safety outputs (PGOOD/RSTB/FS0B), and 10-channel ±1 % voltage monitoring - all documented in its FS8600_SDS Rev. 3.0.
How many voltage rails can MFS8631BMDA0ES monitor, and what is the accuracy?
MFS8631BMDA0ES supports monitoring of up to ten voltage rails with ±1 % accuracy across all VMON inputs. VMON0–VMON3 use DAC-based sensing, while VMON4–VMON9 use resistor bridge inputs - enabling supervision of both internal regulators and external PMIC rails in domain controller architectures.
What is the purpose of the XFAILB pin on MFS8631BMDA0ES?
The XFAILB pin on MFS8631BMDA0ES enables leader/follower power-up sequencing with other NXP low-voltage PMICs in the BYLink system power platform. It synchronizes startup timing and safety state transitions across cascaded SBCs, ensuring deterministic power sequencing without external timing components or firmware coordination.
Is MFS8631BMDA0ES pin-compatible with other FS86 family members?
Yes, MFS8631BMDA0ES uses the HPQFN48eP package and shares identical pinout with all FS86x1 variants (e.g., MFS8601, MFS8611, MFS8621, MFS8631), including MFS8633BMDA0ES. Differences are limited to OTP configuration - such as ERRMON enablement - not physical layout or signal assignment.
What thermal performance can be expected from MFS8631BMDA0ES in a typical automotive layout?
With its HPQFN48eP package and exposed pad soldered to GND, MFS8631BMDA0ES achieves RθJB = 10 °C/W (2s6p) and RθJA = 23 °C/W. This allows sustained 15 A VPRE output at 125 °C ambient temperature in properly designed 2-layer or 4-layer automotive PCBs with adequate copper pour and thermal vias under the exposed pad.
MFS8631BMDA0ESR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Camera
- Current - Supply:
- -
- Voltage - Supply:
- 36V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 48-HVQFN (7x7)
MFS8631BMDA0ESR2 FAQ
1.How can I place an order for MFS8631BMDA0ESR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MFS8631BMDA0ESR2 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MFS8631BMDA0ESR2 reliable?
The price and inventory of MFS8631BMDA0ESR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MFS8631BMDA0ESR2 is usually 5 days.
3.What payment methods are accepted for MFS8631BMDA0ESR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MFS8631BMDA0ESR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MFS8631BMDA0ESR2?
MFS8631BMDA0ESR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MFS8631BMDA0ESR2 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MFS8631BMDA0ESR2?
For technical support, including MFS8631BMDA0ESR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MFS8631BMDA0ESR2 requirements.
6.How does Aetrix verify that MFS8631BMDA0ESR2 is sourced from the original manufacturer or authorized distributors?
All MFS8631BMDA0ESR2 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MFS8631BMDA0ESR2 meets industry standards.
7.What is the process for return or replacement of MFS8631BMDA0ESR2?
All MFS8631BMDA0ESR2 units undergo pre-shipment inspection (PSI). If there is an issue with MFS8631BMDA0ESR2, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MFS8631BMDA0ESR2 part is unused and in its original packaging.
Return procedure for MFS8631BMDA0ESR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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