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NXP Semiconductors MC33908NAE
- Part No.:
- MC33908NAE
- Manufacturer:
- NXP Semiconductors
- Category:
- Special Purpose Regulators
- Package:
- 48-LQFP Exposed Pad
- Datasheet:
-
MC33908NAE.pdf
- Description:
- IC REG AUTO APPL 6OUT 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:220
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Product details
Overview
MC33908NAE from NXP Semiconductors is an automotive-grade power system basis chip integrating a high-speed CAN transceiver (ISO 11898-2/5 compliant), a 1.5 A switching-mode core supply (VCORE), dual linear regulators (VCCA at 5.0 V/3.3 V, VAUX at 5.0 V/3.3 V), battery voltage sensing with MUX output, six configurable I/Os, and fail-safe supervision up to ASIL D. It operates across -40 °C to 125 °C in 48-pin LQFP-EP packaging and targets MCU power management in engine control units and ADAS modules.
For engineers reviewing the MC33908NAE datasheet, MC33908NAE pinout, MC33908NAE application, or MC33908NAE equivalent, this page delivers verified technical context on its buck-boost pre-regulator architecture, VCORE current capability, LIN omission (N-suffix), safety state machine behavior, and thermal shutdown thresholds - all critical for functional safety validation and board-level integration in ISO 26262-compliant systems.
Technical Context
The MC33908NAE implements a dual-stage power architecture: a highly flexible SMPS pre-regulator (VPRE) supporting non-inverting buck-boost or standard buck topologies, followed by a dedicated VCORE SMPS delivering up to 1.5 A at 1.2–3.3 V. Its fail-safe machine monitors over/undervoltage, thermal conditions, and internal regulator feedback (FB_CORE, VCCA_E/B, VAUX_E/B) to assert FS0B and RSTB outputs during fault events.
It integrates a fully compliant ISO 11898-2/5 high-speed CAN transceiver with bus fault protection (±27 V), CAN_5V regulator (5.0 V ±0.2 V, 100 mA), and SPI-configurable I/Os (IO_0–IO_5) with wake-up capability on rising/falling edges. The N-suffix variant excludes LIN functionality - pins TXDL and RXDL are NC, and the LIN block is absent per Figures 4 and 6.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp | -40 °C to 125 °C ambient - qualified for under-hood automotive environments including engine management and transmission control. |
| VCORE Output | 1.2–3.3 V adjustable, 1.5 A max - powers MCU cores requiring stable, high-current low-voltage rails with transient load regulation ≤ ±100 mV. |
| VPRE Pre-regulator | 6.25–7.0 V output, supports buck (VSUP ≥ 4.6 V) or boost (VSUP ≥ 2.7 V) - enables wide input range operation down to 2.7 V for cold-crank resilience. |
| CAN Compliance | ISO 11898-2 and -5 - ensures interoperability with automotive CAN FD networks and robustness against bus faults up to ±27 V. |
| Low-Power Mode | 32 µA typical supply current at 14 V - maintains wake-up readiness via CAN, IOs, or external reset while minimizing battery drain in sleep states. |
| Safety Integrity | ASIL D capable - integrated fail-safe machine with redundant monitoring of VPRE, VCORE, VCCA, VAUX, and die temperature triggers FS0B/RSTB for system-level fault containment. |
| Package | 48-pin LQFP-EP (exposed pad) - provides low thermal resistance (RθJCBOTTOM = 0.9 °C/W) for high-power dissipation in compact ECU layouts. |
Pinout & Package
MC33908NAE uses a 48-pin LQFP-EP (exposed pad) package with 0.5 mm pitch. Pin assignments follow the "33907N/33908N pinout with CAN only" configuration (Figure 6), where LIN-related pins (TXDL, RXDL) are No Connect (NC). The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSUP1/2/3 | Primary power inputs | Three independent supply inputs (all tied externally); enable reverse-battery protection via shared external diode - required for KL30 battery connection. |
| VSENSE | Battery voltage monitor | Senses raw battery voltage prior to reverse-protection diode - feeds analog MUX and undervoltage lockout circuitry for cold-crank detection. |
| FS0B | Failsafe output | Open-drain active-low assertion on fault (startup, overtemp, UV/OV) - directly drives MCU reset or external safety controller with 12 mA sink capability. |
| RSTB | Reset output | Open-drain MCU reset signal asserted low during internal fault or external reset detection (1.0–2.0 V threshold with hysteresis). |
| IO_0–IO_5 | Configurable I/Os | Digital/analog inputs with wake-up edge detection; IO_1 supports redundant Vcore feedback monitoring; IO_4/5 support gate drive for external NMOS. |
| CANH/CANL | CAN bus interface | Differential HSCAN outputs with ±27 V fault tolerance - connect directly to automotive CAN bus without external protection components. |
| VCORE_SNS/FB_CORE/COMP_CORE | VCORE regulation loop | Enable closed-loop control of 1.5 A SMPS: VCORE_SNS senses output, FB_CORE sets target (0.8 V ref), COMP_CORE hosts compensation network. |
| VAUX_E/B/VCCA_E/B | External PNP ballast connections | Support high-current linear regulation (up to 300 mA) using external PNP transistors - decouples heat from die and enables precise 5.0 V/3.3 V tracking. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D-capable fail-safe machine | Monitors VPRE, VCORE, VCCA, VAUX, die temperature, and SPI communication integrity - asserts FS0B/RSTB within microseconds of fault detection for ISO 26262 system partitioning. |
| Flexible VPRE pre-regulator | Configurable as buck (≥4.6 V) or boost (≥2.7 V) to maintain VCORE regulation during cold-crank (6 V) or load-dump (40 V) events - eliminates need for external pre-buck stage. |
| Multi-rail linear regulation | VCCA (5.0 V/3.3 V, 300 mA max) and VAUX (5.0 V/3.3 V, 300 mA max) with foldback current limiting and thermal shutdown - supplies sensors, ADC references, and I/O buffers independently. |
| Integrated battery sensing & MUX | VSENSE + MUX_OUT enables single ADC channel to monitor battery voltage, IO_0/IO_1 analog signals, or internal die temperature (9.9 mV/°C coefficient) - reduces MCU pin count and BOM cost. |
| Configurable wake-up I/Os | Six digital inputs (IO_0–IO_5) with programmable edge-triggered wake-up - supports safety-critical monitoring of external IC error flags or redundant sensor bridges without MCU polling. |
Applications
| Electrical Power Steering (EPS) | Engine Control Unit (ECU) |
|---|---|
Use Scenario: Real-time torque assist calculation requiring deterministic MCU execution and isolated sensor power. IC Role / Device Role / Timing Role: MC33908NAE supplies 1.5 A VCORE to the EPS MCU, regulates 5.0 V VCCA for torque sensor ADC reference, and monitors battery voltage via VSENSE/MUX_OUT during cranking. Use Value: Maintains VCORE regulation down to 2.7 V input, ensuring uninterrupted MCU operation during cold-start; ASIL D fail-safe outputs trigger steering motor disable on VCORE fault. | Use Scenario: High-reliability combustion control with multiple analog sensors, CAN diagnostics, and fail-safe shutdown. IC Role / Device Role / Timing Role: MC33908NAE powers the ECU's main MCU core (VCORE), supplies 3.3 V VCCA to crankshaft position sensor interface, and asserts FS0B on overtemperature detected by internal thermal sensor. Use Value: Integrated CAN transceiver eliminates external PHY; VPRE boost mode sustains VCORE during 6 V cranking; IO_1 monitors redundant Vcore divider for fault cross-check. |
| Advanced Driver Assistance Systems (ADAS) | Hybrid Electric Vehicle (HEV) Inverter Control |
Use Scenario: Multi-camera fusion module requiring low-noise power, CAN communication, and functional safety compliance. IC Role / Device Role / Timing Role: MC33908NAE delivers clean 1.2 V VCORE to vision processor, regulates 3.3 V VCCA for image sensor I/Os, and provides CAN diagnostics via integrated TXD/RXD. Use Value: Low 32 µA LPOFF current extends standby time; MUX_OUT reads camera supply rail for health monitoring; FS0B initiates safe camera shutdown on VCORE UV event. | Use Scenario: Inverter gate driver power management with isolation, thermal monitoring, and fault reporting. IC Role / Device Role / Timing Role: MC33908NAE supplies 5.0 V VAUX to isolated gate driver bias rails, senses inverter DC-link voltage via VSENSE, and asserts RSTB on overtemperature detected at die junction. Use Value: VAUX thermal shutdown (160 °C) protects gate drivers before inverter thermal runaway; VPRE boost mode maintains VAUX during low-battery HEV start-stop cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power system basis chip applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33908LAE | Includes LIN transceiver (TXDL/RXDL active); same VCORE (1.5 A), VPRE, and safety features. | Required where LIN communication to body ECUs or sensors is needed - e.g., HVAC actuators or door modules. | Select MC33908LAE only if LIN protocol support is mandatory; otherwise MC33908NAE reduces pin count and simplifies layout. |
| MC33907NAE | Same CAN-only feature set but lower VCORE current (0.8 A); identical package, pinout, and safety architecture. | Suitable for lower-power MCUs (e.g., S12Z, S32K116) where 1.5 A VCORE headroom is unnecessary. | Choose MC33907NAE to reduce cost and thermal load when MCU core current demand is ≤ 0.8 A - no PCB changes required. |
Compared with MC33908LAE, MC33908NAE removes LIN hardware to reduce complexity and EMI risk in CAN-only domains; versus MC33907NAE, it doubles VCORE current capacity for next-generation high-performance automotive MCUs without altering footprint or safety certification.
Availability
MC33908NAE is available at Aetrix Electronics and suitable for electrical power steering, engine management, and advanced driver assistance systems requiring stable component supply, ASIL D functional safety compliance, and extended temperature operation.
Supply support for MC33908NAE 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 leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in functional safety and automotive-grade power management.
The MC33908NAE belongs to NXP's SMARTMOS power system basis chip family, designed specifically for ASIL D-compliant automotive ECUs that integrate MCU power, CAN communication, and fail-safe supervision in a single package.
FAQ
What is the maximum output current of the VCORE regulator in MC33908NAE?
The VCORE regulator in MC33908NAE delivers up to 1.5 A continuous output current in normal operating mode, as specified in Table 1 and confirmed in Section 4.2 of the datasheet. This capability supports high-performance automotive MCUs such as the S32K3 series. Current limiting is set at 2–3.5 A depending on configuration, and thermal shutdown activates at 160 °C to protect the device. MC33908NAE maintains this rating across its full -40 °C to 125 °C ambient temperature range.
Does MC33908NAE include a LIN transceiver?
No, MC33908NAE does not include a LIN transceiver. The "N" suffix explicitly denotes the CAN-only variant, and datasheet Figures 4 and 6 confirm that pins TXDL and RXDL are marked NC (No Connect). The internal LIN block is omitted, reducing silicon area and EMI susceptibility. For designs requiring LIN, the MC33908LAE variant must be selected instead. MC33908NAE retains full CAN functionality, including ISO 11898-2/5 compliance and ±27 V bus fault protection.
How does the VPRE pre-regulator operate in boost mode for cold-crank support?
The VPRE pre-regulator in MC33908NAE enters boost mode when input voltage falls below 4.6 V, sustaining operation down to 2.7 V - critical for cold-crank scenarios. In this mode, VPRE delivers 6.25–7.0 V to the VCORE SMPS, enabling continued 1.5 A core supply even at battery voltages as low as 6 V. The boost topology is implemented using internal NMOS switches and external bootstrap capacitors (BOOT_PRE, SW_PRE1/SW_PRE2), with current capability de-rated to 0.3–2.0 A depending on VSUP level per Table 4.
What safety certifications apply to MC33908NAE?
MC33908NAE is designed to support ASIL D compliance per ISO 26262 when integrated into a properly architected system. Its fail-safe machine provides redundant monitoring of VPRE, VCORE, VCCA, VAUX, die temperature, and SPI communication, asserting FS0B and RSTB outputs on fault detection. While the device itself is not "certified," its safety mechanisms - including dual voltage supervisors, thermal warning/shutdown thresholds, and fail-safe state machine - are documented in the datasheet to enable customer FMEDA and safety case development for MC33908NAE-based systems.
Can MC33908NAE regulate both 5.0 V and 3.3 V outputs simultaneously?
Yes, MC33908NAE can regulate VCCA and VAUX independently at either 5.0 V or 3.3 V, selected via the hardware SELECT pin. VCCA supports 5.0 V (±1%) at up to 100 mA internally or 300 mA with external PNP ballast; VAUX supports the same voltages and current ratings. Both regulators include foldback current limiting, thermal shutdown (160 °C), and undervoltage/overvoltage detection. The SELECT pin configures output voltage at power-up, and MC33908NAE maintains stable regulation across load steps from 0 to full rated current.
MC33908NAE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 48-LQFP Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Power Supply, Automotive Applications
- Voltage - Input:
- -1V ~ 40V
- Number of Outputs:
- 6
- Voltage - Output:
- Multiple
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-HLQFP (7x7)
MC33908NAE FAQ
1.How can I place an order for MC33908NAE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33908NAE 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 MC33908NAE reliable?
The price and inventory of MC33908NAE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33908NAE is usually 5 days.
3.What payment methods are accepted for MC33908NAE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33908NAE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33908NAE?
MC33908NAE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33908NAE 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 MC33908NAE?
For technical support, including MC33908NAE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33908NAE requirements.
6.How does Aetrix verify that MC33908NAE is sourced from the original manufacturer or authorized distributors?
All MC33908NAE 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 MC33908NAE meets industry standards.
7.What is the process for return or replacement of MC33908NAE?
All MC33908NAE units undergo pre-shipment inspection (PSI). If there is an issue with MC33908NAE, 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 MC33908NAE part is unused and in its original packaging.
Return procedure for MC33908NAE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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