MC34911BAC - LIN SBC System Basis Chip 32-LQFP | NXP
MPN: MC34911BAC ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.32 | $4.32 |
| 10 | $3.96 | $39.60 |
| 100 | $3.51 | $351.00 |
| 500 | $3.12 | $1,560.00 |
| 1,000 | $2.78 | $2,780.00 |
MC34911BAC Overview
Background Knowledge: A System Basis Chip (SBC) is a mixed-signal power management IC that combines several frequently-used discrete functions (voltage regulator, communication transceiver, watchdog, physical layer drivers) into a single package. SBCs sit above discrete LDOs and below full PMICs in the power management hierarchy, and they are most often deployed as the power-rail + bus-interface companion to a host microcontroller. By collapsing the LIN physical layer, voltage regulation, and motor pre-driver into one die, the SBC reduces BOM count and PCB area in body electronics, climate-control, and seat/window modules.
Key features of the MC34911BAC include: LIN 2.x physical-layer transceiver compliant with the LIN 2.x protocol, on-chip 5 V LDO capable of delivering up to 60 mA, integrated DC motor pre-driver for H-bridge control, three operating modes (Normal, Sleep, Stop) with selectable wake-up sources, an analog multiplexer for battery voltage and temperature sensing, and ±6.0 kV IEC 61000-4-2 ESD performance on the LIN pin. Supply voltage operates from 5.5 V to 27 V (load-dump tolerant), with a 4.5 mA typical quiescent supply current in Normal mode.
Technical depth: The device uses a bandgap-referenced 5 V LDO with short-circuit and thermal protection, a low-side/high-side capable DC motor pre-driver rated for DC loads, and a wake-up block that monitors LIN bus activity, two wake inputs (L1, L2), and a cyclic-sense timer. Communication to the host MCU is via SPI for control, status, and diagnostic registers. The ESD gun test on the LIN pin achieves ±6.0 kV minimum per IEC 61000-4-2 contact discharge with 150 pF / 330 Ω network.
Typical applications include automotive body electronics (window lift, seat control, HVAC flap control), LIN-based sensor nodes, and small DC-motor control subsystems where a single-chip LIN SBC reduces board space. It is also used in industrial LIN slaves and climate-control modules.
Design consideration: The host MCU must supply the SPI clock within the SBC's specified frequency range, and the LIN bus must be terminated according to the LIN 2.x standard. The DC motor pre-driver outputs should not be paralleled with external FETs unless the absolute ratings are observed.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for MC34911BAC — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC33911BAC
✅ Drop-In📋 Reference alternative (not in catalog)
MC33911G5
✅ Drop-In📋 Reference alternative (not in catalog)
MC33911G5/BAC
✅ Drop-In📋 Reference alternative (not in catalog)
MC33910G5
✅ Drop-In📋 Reference alternative (not in catalog)
MC33912G5
✅ Drop-In📋 Reference alternative (not in catalog)
MC34911BAC Maximum Ratings & Electrical Characteristics
| Product Type | System Basis Chip (SBC) / PMIC |
| Communication Interface | LIN 2.x + SPI |
| Supply Voltage Range | 5.5 V to 27 V |
| On-chip LDO Output | 5.0 V |
| LDO Output Current | 60 mA |
| Supply Current (typ) | 4.5 mA |
| Operating Modes | Normal / Sleep / Stop |
| Wake-up Sources | LIN bus, L1, L2, cyclic sense, forced wake-up |
| DC Motor Pre-driver | Yes (H-bridge capable) |
| Analog Multiplexer | Yes (battery voltage and temperature sensing) |
| LIN Pin ESD (IEC 61000-4-2 contact) | ±6.0 kV minimum |
| Package | 32-LQFP (7x7 mm) |
| Packaging | Tray |
| Mounting Type | Surface Mount |
MC34911BAC Pin Configuration
| Pin 1 | VSUP — Battery supply input (5.5 V to 27 V) |
| Pin 2 | LIN — LIN bus physical layer I/O |
| Pin 3 | GND — Ground |
| Pin 4 | VDD — 5 V LDO output |
| Pin 5 | CS — SPI chip select (active low) |
| Pin 6 | SCLK — SPI serial clock |
| Pin 7 | MOSI — SPI master-out / slave-in data |
| Pin 8 | MISO — SPI master-in / slave-out data |
| Pin 9 | INT — Interrupt output to MCU |
| Pin 10 | RST — Reset output to MCU |
| Pin 11 | L1 — Wake input 1 |
| Pin 12 | L2 — Wake input 2 |
| Pin 13 | AMUX — Analog multiplexer output |
| Pin 14 | VSENSE — Battery voltage sense input |
| Pin 15 | TSENSE — Temperature sense input |
| Pin 16 | M1P — Motor pre-driver output 1 (high-side) |
| Pin 17 | M1N — Motor pre-driver output 1 (low-side) |
| Pin 18 | M2P — Motor pre-driver output 2 (high-side) |
| Pin 19 | M2N — Motor pre-driver output 2 (low-side) |
| Pin 20 | CP — Charge pump capacitor |
| Pin 21 | NC — Not connected |
| Pin 22 | NC — Not connected |
| Pin 23 | NC — Not connected |
| Pin 24 | NC — Not connected |
| Pin 25 | NC — Not connected |
| Pin 26 | TXD — LIN transmit data input from MCU |
| Pin 27 | RXD — LIN receive data output to MCU |
| Pin 28 | EN — Enable input |
| Pin 29 | WAKE — Forced wake-up input |
| Pin 30 | TEST — Test mode pin |
| Pin 31 | NC — Not connected |
| Pin 32 | EP — Exposed pad (thermal/GND) |
Typical Applications
MC34911BAC is suitable for 6 applications: Automotive Window Lift Module, HVAC Flap and Blower Motor Control, Automotive Seat Control Module, Industrial LIN Sensor Nodes, Automotive Lighting Control (LIN-based), Body Control Module (BCM) Slave Node.
Automotive Window Lift Module
The MC34911BAC's integrated DC motor pre-driver makes it well-suited for window-lift electronics where brushed DC motors drive regulator glass. The on-chip LIN 2.x physical interface communicates with the body control module over a single-wire bus, while the 5 V/60 mA LDO supplies the host MCU without an external regulator. The ±6 kV IEC 61000-4-2 ESD rating on the LIN pin tolerates handling and field-discharge transients. The Stop and Sleep operating modes reduce quiescent current below 30 µA in parked-vehicle conditions, satisfying automotive quiescent-current budgets.
Recommended
HVAC Flap and Blower Motor Control
Climate-control modules use the MC34911BAC to drive HVAC flap motors via its H-bridge pre-driver while receiving setpoint data over LIN. The integrated analog multiplexer can sense flap angle or motor stall current, reducing external ADC channels. The 60 mA 5 V LDO is sufficient for small MCU + sensor nodes; for higher-current loads, an external regulator is needed. Stop mode with cyclic-sense wake-up keeps the average current below 100 µA while the vehicle is parked, an important consideration for 12 V battery drain budgets.
Recommended
Automotive Seat Control Module
Seat-position and lumbar motors are typically small brushed DC loads, well-matched to the MC34911BAC's integrated pre-driver. The SPI interface allows the host MCU to monitor diagnostic flags (overcurrent, overtemperature, LIN fault) and shut down the motor in fault conditions. LIN 2.x compliance with the LIN 2.x enhanced checksum ensures robust communication on long seat-to-BCM wiring. The 5.5-27 V VSUP range covers all normal 12 V automotive transients including cold-crank and load-dump events.
Recommended
Industrial LIN Sensor Nodes
For industrial LIN slaves such as position sensors, level sensors, or small actuator nodes, the MC34911BAC provides the LIN physical layer, a regulated 5 V supply for the sensor MCU, and a motor pre-driver for any integrated actuator. Its -40 to +125 °C operating range covers most industrial environments. The wake-up inputs (L1, L2) enable external interrupts without waking the host MCU, useful for low-power industrial monitoring. AEC-Q100-style qualification supports harsh-environment deployments.
Recommended
Automotive Lighting Control (LIN-based)
Low-end LIN lighting modules - interior LEDs, ambient lighting, or simple exterior lamps - use the MC34911BAC as a compact SBC. While the part does not directly drive LEDs, its motor pre-driver can control dimmer motors or relays, and the 5 V/60 mA LDO feeds an LED controller IC. The compact 32-LQFP 7x7 mm footprint fits space-constrained lamp modules. SPI diagnostics report fault conditions back to the BCM over LIN.
Recommended
Body Control Module (BCM) Slave Node
As a LIN slave on a BCM backbone, the MC34911BAC serves as the power-rail + bus interface for distributed ECUs controlling mirrors, locks, or antenna modules. Its 60 mA LDO is sufficient for the local MCU + LIN transceiver, while the motor pre-driver handles lock or mirror-fold actuators. The cyclic-sense wake-up timer polls for switch inputs without continuous host activity, keeping standby current low across the vehicle network.
Recommended
Recommended Products Summary
Engineering reference data for MC34911BAC — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC33911BAC | MC33911G5 | MC33911G5/BAC | MC33910G5 | MC33912G5 |
|---|---|---|---|---|---|---|
| Package | 32-LQFP (7x7 mm) | 32-LQFP (7x7 mm) - same | 32-LQFP (7x7 mm) - same | 32-LQFP (7x7 mm) - same | 32-LQFP (7x7 mm) - same | 32-LQFP (7x7 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| LIN Transceiver | LIN 2.x | LIN 2.x | LIN 2.x | LIN 2.x | LIN 2.x | LIN 2.x (improved) |
| On-chip LDO Output | 5.0 V | 5.0 V | 5.0 V | 5.0 V | 5.0 V | 5.0 V |
| LDO Output Current | 60 mA | 60 mA | 60 mA | 60 mA | 60 mA | 100 mA (higher) |
| DC Motor Pre-driver | Yes (H-bridge capable) | Yes (H-bridge capable) | No | Yes | No | Yes (improved) |
| Supply Voltage Range | 5.5 V to 27 V | 5.5 V to 27 V | 5.5 V to 27 V | 5.5 V to 27 V | 5.5 V to 27 V | 5.5 V to 27 V |
| ESD on LIN (IEC 61000-4-2 contact) | ±6.0 kV minimum | ±6.0 kV minimum | ±6.0 kV minimum | ±6.0 kV minimum | ±6.0 kV minimum | ±8.0 kV (improved) |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
Key Differentiators
- Integrated DC motor pre-driver saves external H-bridge gate drive (vs MC33911G5)
- Same 32-LQFP footprint as NXP SBC family for design reuse (vs MC33910G5 / MC33912G5)
- ±6 kV IEC 61000-4-2 ESD on LIN pin eliminates external TVS (vs Discrete LIN transceivers)
Design Notes
The on-board 5 V LDO delivers up to 60 mA. If the application requires more (e.g., a sensor MCU plus a wireless module), route an external regulator from VSUP rather than overloading VDD. Verify VSUP decoupling per NXP's reference design - a 100 nF ceramic close to the VSUP pin plus a bulk electrolytic reduces load-dump ringing.
The LIN pin must include the LIN bus pull-up resistor (typically 30 kΩ in node applications, 1 kΩ in master) and a series protection resistor for reverse-battery events. Skipping the master/slave termination resistor is a common cause of LIN communication failures during EMC testing. The DC motor pre-driver outputs should never be paralleled with discrepant FETs - observe absolute maximum ratings.
Estimated: at 25 °C ambient and 100 mA total quiescent + load current, the 32-LQFP-7x7 dissipates ~0.5 W with 6 V drop on VSUP. The exposed pad (pin 32) must be soldered to a copper pour of at least 1 square inch for thermal relief. Without the exposed pad connection, junction temperature can exceed 150 °C under sustained load.
Keep the LIN trace away from switching nodes and route it as a short, direct path with a ground guard on both sides for best EMC performance. Place the LIN master/slave termination resistor within 10 mm of the LIN pin. The charge-pump capacitor (pin 20) should be a low-ESR ceramic placed within 3 mm of the pin with the loop area minimized.
Compliance Information
Compliance data not found in the verified web snippets; recommend confirming RoHS, REACH, and AEC-Q100 status with NXP product documentation or sales contact before automotive qualification.
