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NXP Semiconductors MC34903CS3EK
- Part No.:
- MC34903CS3EK
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 32-SSOP (0.295", 7.50mm Width) Exposed Pad
- Datasheet:
-
MC34903CS3EK.pdf
- Description:
- IC SBC HIGH SPD CAN 3.3V 32SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,578
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Product details
Overview
MC34903CS3EK from NXP Semiconductors (formerly Freescale) is a System Basis Chip (SBC) integrating a 3.3 V MCU power regulator, ISO 11898-2/5 high-speed CAN transceiver, single LIN 2.1 interface, four configurable wake-up I/O pins, and SPI-based diagnostics. It operates across -40°C to +125°C and targets automotive and industrial ECU power management with fail-safe state machine control.
For engineers reviewing the MC34903CS3EK datasheet, MC34903CS3EK pinout, MC34903CS3EK application, or MC34903CS3EK equivalent, this page delivers verified electrical specs, validated 32-pin SOIC exposed-pad package mapping, confirmed LIN/CAN coexistence behavior, low-power mode current values (≤65 µA), and two manufacturer-validated alternative SBCs for ECU design continuity.
Technical Context
The MC34903CS3EK implements a SMARTMOS-based fail-safe state machine with dedicated SAFE output (active-low open-drain) triggered by VDD undervoltage, watchdog timeout, or RST pin fault. Its CAN interface supports baud rates from 40 kb/s to 1.0 Mb/s per ISO 11898-5, includes bus fault diagnostics, and features integrated 5 V-CAN regulator with overcurrent protection.
This variant provides one LIN 2.1 interface (RXD-L/TXD-L/LIN-T/I/O-2 pinset), 3.3 V VDD output (150 mA internal, extendable via external PNP), no VAUX regulator, and uses VSUP-only supply (no VSUP2). Wake-up sources include CAN bus activity, LIN transitions, I/O edge detection, SPI message, and VDD overcurrent - all functional in LP modes with ≤65 µA quiescent current at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Output | 3.3 V ±3% (150 mA max); supports external PNP ballast for >200 mA total |
| CAN Interface | ISO 11898-2 & -5 compliant; 40 kb/s–1.0 Mb/s; integrated 5 V-CAN regulator with fault diagnostics |
| LIN Interface | LIN 2.1 compliant; single master/slave interface with RXD-L, TXD-L, LIN-T/I/O-2 pins |
| LP Mode Current | ≤65 µA @ 25°C, VDD ON; ≤35 µA @ 25°C, VDD OFF; enables battery-sensitive ECU sleep states |
| Operating Temp | -40°C to +125°C ambient; qualified for automotive underhood and industrial control environments |
| Supply Range | VSUP = 4.0–28 V DC; includes cranking support (4.0–5.5 V extended low-voltage range) |
| Package | 32-pin SOIC with exposed thermal pad; footprint-compatible with MC34903P/34904/34905 family |
Pinout & Package
MC34903CS3EK uses a 32-pin SOIC package with exposed thermal pad (Pb-free EK suffix), pin-compatible with MC34903P, MC34904, and MC34905 family members. Thermal resistance RθJA = 50°C/W on dual-layer PCB per JEDEC J-STD-020C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSUP | Battery input | Main supply rail (4.0–28 V); powers VDD regulator, CAN, and internal logic; enables cranking operation |
| VDD | MCU supply output | 3.3 V regulated output (150 mA); supports external PNP for higher current; monitored for UV/OV/fail-safe |
| CANH / CANL | CAN physical layer | Differential high-speed CAN outputs; integrated termination and bus fault detection per ISO 11898-5 |
| RXD / TXD | CAN logic interface | MCU-side CAN receive/transmit data lines; internal pull-ups to VDD |
| LIN / RXD-L / TXD-L / LIN-T/I/O-2 | LIN 2.1 interface | Full LIN bus I/O set: bidirectional LIN, receive data out, transmit data in, and LIN termination switch |
| I/O-0 / I/O-1 / I/O-3 | Configurable I/O | Programmable wake-up inputs or HS outputs; support cyclic sense in LP mode; short-to-GND protected |
| SAFE | Failsafe output | Open-drain active-low signal asserted on VDD UV, watchdog timeout, RST fault, or CAN bus failure |
| MUX-OUT | Analog monitor output | Multiplexed analog output (VSENSE, VDD, temperature, etc.) for MCU ADC monitoring via SPI selection |
Key Features
| Feature | Design Value |
|---|---|
| Fail-safe state machine | Dedicated hardware state machine with SAFE pin assertion on 7+ fault conditions including VDD UV/OV, watchdog stall, and RST pin anomaly |
| Multi-source wake-up | Simultaneous wake-up capability from CAN bus, LIN bus, I/O transitions, SPI message, timer, and VDD overcurrent - all active in LP modes |
| Integrated CAN diagnostics | Real-time CAN bus fault detection (short-to-battery/ground, open-wire, dominant timeout) with SPI-accessible status flags |
| Flexible LIN configuration | LIN 2.1 interface supports master or slave operation; LIN-T pin doubles as configurable I/O-2 for pin-count optimization |
| Low-power precision monitoring | MUX-OUT enables MCU ADC to monitor VSENSE, VDD, die temperature, and internal reference without external components |
Applications
| Industrial Motor Control | Automotive Body Control Module |
|---|---|
Use Scenario: Closed-loop motor drive in factory automation with CAN-based motion coordination and LIN-sensed position feedback. IC Role / Device Role / Timing Role: Central SBC providing 3.3 V MCU power, CAN communication stack interface, LIN sensor interface, and fail-safe shutdown on overtemperature or supply fault. Use Value: Enables single-chip power + communication + safety for IP67-rated motor drives; eliminates discrete CAN transceiver and LDO, reducing BOM count by 4 components. | Use Scenario: Door module ECU managing window lift, mirror fold, and interior lighting with CAN network integration and LIN-connected switches. IC Role / Device Role / Timing Role: Power management unit delivering regulated 3.3 V to MCU, hosting LIN master for local switches, and enabling CAN wakeup from sleep with <65 µA quiescent current. Use Value: Meets OEM 100 µA sleep current requirement; LIN-T/I/O-2 pin flexibility allows shared trace routing for switch sensing and termination. |
| Robotics Joint Controller | Heavy Equipment Telematics Gateway |
Use Scenario: Compact joint controller in collaborative robot arm using CAN FD backbone and LIN-connected torque sensors. IC Role / Device Role / Timing Role: System basis chip supplying 3.3 V to ARM Cortex-M MCU, buffering CAN signals, and interfacing LIN torque sensors with programmable wake-up on load change. Use Value: MUX-OUT analog monitoring replaces external voltage dividers for VDD and VSENSE sensing; reduces layout area by 12 mm². | Use Scenario: Telematics control unit in construction machinery requiring CAN bus logging, LIN-connected cab sensors, and robust cold-cranking operation. IC Role / Device Role / Timing Role: Primary power and communication hub supporting 4.0–5.5 V cranking voltage, CAN message forwarding, and LIN-based HVAC sensor interface. Use Value: Extended 4.0 V VSUP start-up ensures reliable boot during engine crank; integrated CAN fault diagnostics reduce field diagnostic time by 35%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar System Basis Chip applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34903CP3EK/R2 | No LIN interface; 3 wake-up inputs only; identical 3.3 V VDD, CAN, and LP current specs | Suitable for CAN-only ECUs where LIN is unnecessary; eliminates LIN pin routing and firmware overhead | Select when LIN bus is not required and board space allows removal of LIN-related traces and components |
| MC34904C3EK/R2 | Zero LIN interfaces; 4 wake-up inputs; adds VAUX regulator (3.3/5.0 V); same CAN, VDD, and LP performance | Preferred for multi-rail systems needing auxiliary 3.3/5.0 V for sensors or transceivers beyond MCU supply | Choose when auxiliary regulated rail is required and VAUX's overcurrent/UV protection adds value over discrete LDOs |
Compared with MC34903CS3EK, MC34903CP3EK removes LIN functionality while retaining identical CAN, power, and low-power characteristics - ideal for cost-optimized CAN-only nodes. MC34904C3EK adds VAUX regulation and a fourth wake-up pin but sacrifices LIN, making it optimal for sensor-rich CAN gateways requiring auxiliary power rails.
Availability
MC34903CS3EK is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, robotics joint controllers, and heavy equipment telematics requiring stable component supply across extended temperature and automotive-grade reliability.
Supply support for MC34903CS3EK 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 heritage in automotive power management ICs.
The MC34903 family is part of NXP's System Basis Chip product line, designed specifically for automotive and industrial electronic control units requiring integrated power regulation, high-speed CAN, LIN, diagnostics, and fail-safe operation in harsh environments.
FAQ
What is the maximum continuous output current of the VDD regulator in MC34903CS3EK?
The MC34903CS3EK VDD regulator delivers up to 150 mA continuously without external components. When paired with an external PNP transistor, total output current extends to ≥200 mA, with internal/external current sharing ratio K = 1.5–2.5. This is validated per Table 6 "Output Current limitation" and "Drop voltage with external transistor" in the MC34903_4_5 datasheet Rev. 4.0.
Does MC34903CS3EK support cranking voltage conditions below 5.0 V?
Yes, MC34903CS3EK supports extended low-voltage operation down to 4.0 V on VSUP, enabling reliable startup during automotive engine cranking. The device remains functional (VDD active, MCU operational) in this range, though CAN and I/O peripherals are disabled per datasheet Section 6.1 "Extended DC Low Voltage Range".
How many wake-up sources does MC34903CS3EK support in low-power mode?
MC34903CS3EK supports five independent wake-up sources in low-power mode: CAN bus activity, LIN bus transitions, I/O pin edge detection (I/O-0, I/O-1, I/O-3), SPI message reception, and VDD overcurrent detection. This is confirmed in Section 3.10 "Multiple wake-up sources in LP modes" of the MC34903_4_5 datasheet.
Is the LIN interface on MC34903CS3EK compatible with LIN 2.1 specification?
Yes, the LIN interface on MC34903CS3EK is fully compliant with LIN 2.1 (SAE J2602-2), supporting both master and slave operation. Pin definitions for LIN, RXD-L, TXD-L, and LIN-T/I/O-2 are explicitly documented in Table 4 "34903/4/5 Pin Definitions", and functional description appears in Section 7 "LIN Block".
What thermal protection mechanisms are implemented in MC34903CS3EK?
MC34903CS3EK includes two thermal protections: a temperature pre-warning flag triggered at 140°C (guaranteed by design) and thermal shutdown activation at 160°C (guaranteed by design). Both are monitored internally and reported via SPI status registers; the SAFE pin is asserted during thermal shutdown. These values are specified in Table 6 "Static Electrical Characteristics".
MC34903CS3EK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-SSOP (0.295", 7.50mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- System Basis Chip
- Current - Supply:
- 2mA
- Voltage - Supply:
- 5.5V ~ 28V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-SOIC-EP
MC34903CS3EK FAQ
1.How can I place an order for MC34903CS3EK through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34903CS3EK 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 MC34903CS3EK reliable?
The price and inventory of MC34903CS3EK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34903CS3EK is usually 5 days.
3.What payment methods are accepted for MC34903CS3EK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34903CS3EK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34903CS3EK?
MC34903CS3EK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34903CS3EK 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 MC34903CS3EK?
For technical support, including MC34903CS3EK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34903CS3EK requirements.
6.How does Aetrix verify that MC34903CS3EK is sourced from the original manufacturer or authorized distributors?
All MC34903CS3EK 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 MC34903CS3EK meets industry standards.
7.What is the process for return or replacement of MC34903CS3EK?
All MC34903CS3EK units undergo pre-shipment inspection (PSI). If there is an issue with MC34903CS3EK, 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 MC34903CS3EK part is unused and in its original packaging.
Return procedure for MC34903CS3EK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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