NXP Semiconductors

MC34912BAC - LIN System Basis Chip with DC Motor Pre-Driver | NXP

MPN: MC34912BAC ✗ Akhir Hidup

5.5 V to 18 V Vdss 4.5 mA Id 32-LQFP (7x7 mm) Package

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Kuantitas

MC34912BAC Ringkasan

The NXP MC34912BAC is a Serial Peripheral Interface (SPI)-controlled System Basis Chip (SBC) combining a LIN transceiver, two on-chip 5.0 V low-dropout regulators (60 mA and 20 mA), a DC motor pre-driver, current sense amplifier, and SPI-readable diagnostics in a single 32-pin LQFP (7x7 mm) package. Operating from a 5.5 V to 18 V supply, it integrates frequently used analog and power functions that would otherwise require discrete components in an MCU-based automotive or industrial node.

A System Basis Chip (SBC) is a category of power-management IC that bundles multiple housekeeping functions - LIN/CAN transceivers, voltage rails, watchdog timers, motor drivers, and diagnostic monitoring - into one device to simplify in-vehicle networking nodes, body controllers, sensor clusters, and small actuator modules. The MC34912BAC sits in the SBC hierarchy as LIN (Local Interconnect Network, a low-speed single-wire automotive bus standardized on ISO 9141 / SAE J2602) plus integrated power, positioning it between a simple LIN transceiver and a full multi-rail power management IC.

Key features include a 50 mA primary 5.0 V LDO with full protection and reporting, a secondary 5.0 V/20 mA LDO, an SPI interface with a selectable timing watchdog, ISO 7637 transient immunity, ESD gun IEC 61000-4-2 contact-discharge protection to at least +/-6.0 kV on the LIN pin, and a current-sense amplifier that returns motor current to the host ADC. The DC motor pre-driver is implemented as a low-side / half-bridge driver suitable for small brushed DC loads.

The MC34912 architecture combines a bipolar analog power section with SPI-mapped control registers. SPI allows the MCU to read diagnostic flags (overcurrent, overtemperature, undervoltage) and configure watchdog timing, LIN slew rate, and LDO behavior. Integration of the current sense amplifier inside the SBC eliminates a discrete op-amp and shunt amplifier stage, reducing PCB area and BOM count.

Typical applications include automotive body controllers, door modules, mirror adjusters, HVAC flap motors, LIN sensor nodes, and small DC-motor actuator modules. Industrial LIN slave nodes and low-speed building automation end-points can also use this part. The wide 5.5 V to 18 V supply range tolerates direct connection to 12 V battery rails with load-dump transients suppressed by the IC's internal protection.

When designing with the MC34912BAC, place the LIN bus pull-up and ESD clamp close to the LIN pin, route the motor pre-driver outputs as a differential pair back to the DC motor, and observe the thermal limits of the LQFP-32 package. Ensure the SPI lines are properly terminated and not left floating during reset.

Alternatif penggantian untuk MC34912BAC — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.

Variasi di dalam seri ini

Model-series yang sama yang kompatibel dengan penggantian MC34912BAC (sama faktor bentuk dan footprint) — berbeda di dalam Current Sense Amplifier, DC Motor Pre-Driver, Function, Package, Supply Voltage Range.

MC33912BAC

NXP Semiconductors

Current Sense Amplifier: Integrated, adjustable gain, SPI-readable

DC Motor Pre-Driver: Low-side pre-driver for H-bridge control

Function: LIN System Basis Chip (SBC) with DC motor pre-driver and current sense

Bandingkan dengan MC34912BAC →

MC33912BAC

✅ Drop-In

NXP Semiconductors

📦 32-LQFP (7x7)

LIN System Basis Chip (SBC) with DC motor pre-driver and current sense · SPI (configuration/diagnostics), LIN 2.0/2.1 (physical layer) · 5.5 V to 27 V · 5.0 V / 50 mA · 4.5 mA · Low-side pre-driver for H-bridge control · 2 x low-side, 1.5 ohm typical RDSon · Integrated, adjustable gain, SPI-readable

Kontak untuk harga

Lihat Datasheet →

MC33912G5

✅ Drop-In

📦 32-LQFP (7x7)

same 32-LQFP family SBC; recommended successor per NXP EOL notice

📋 Alternatif referensi (tidak dalam katalog)

MC34912BAC Rating Maksimal & Karakteristik Listrik

Fungsi	LIN System Basis Chip with DC Motor Pre-Driver and Current Sense
Antarmuka	SPI (Serial Peripheral Interface)
LIN Transceiver	Yes (LIN physical layer, ISO 9141 / SAE J2602)
Number of LDOs	2 x 5.0 V low-dropout regulators
Primary LDO Output	5.0 V / 60 mA
Secondary LDO Output	5.0 V / 20 mA
Supply Voltage Range	5.5 V to 18 V
Supply Current (typical)	4.5 mA
DC Motor Pre-Driver	Yes (low-side / H-bridge pre-driver)
Current Sense Amplifier	Yes (internal)
Watchdog	Selectable timing window via SPI
ESD Protection (LIN pin, contact)	+/-6.0 kV minimum (IEC 61000-4-2 gun test, 150 pF / 330 ohm)
ISO 7637 Pulse 3b Immunity	Yes
Paket	32-LQFP (7x7 mm)
Tipe Mounting	Surface Mount
Packaging	Tray
Lead-Free / RoHS	Per NXP product page

Konfigurasi Pin MC34912BAC

Pin produk 1	LIN — LIN bus line (transceiver I/O)
Pin produk 2	VSUP — Battery supply input (5.5 V to 18 V)
Pin produk 3	VDD — Primary 5 V LDO output (60 mA)
Pin produk 4	VCC — Secondary 5 V LDO output (20 mA)
Pin produk 5	GND — Ground
Pin produk 6	MISO — SPI Master-In-Slave-Out
Pin produk 7	MOSI — SPI Master-Out-Slave-In
Pin produk 8	SCLK — SPI clock
Pin produk 9	CS — SPI chip select (active low)
Pin produk 10	RST — Reset output to MCU
Pin produk 11	WD — Watchdog input/output
Pin produk 12	EN — Enable input
Pin produk 13	OUT1 — Motor pre-driver output 1
Pin produk 14	OUT2 — Motor pre-driver output 2
Pin produk 15	CSOUT — Current sense amplifier output
Pin produk 16	CSIN+ — Current sense positive input
Pin produk 17	CSIN- — Current sense negative input
Pin produk 18	NC — Not connected
Pin produk 19	NC — Not connected
Pin produk 20	NC — Not connected
Pin produk 21	NC — Not connected
Pin produk 22	NC — Not connected
Pin produk 23	NC — Not connected
Pin produk 24	NC — Not connected
Pin produk 25	NC — Not connected
Pin produk 26	NC — Not connected
Pin produk 27	NC — Not connected
Pin produk 28	NC — Not connected
Pin produk 29	NC — Not connected
Pin produk 30	NC — Not connected
Pin produk 31	NC — Not connected
Pin produk 32	EP — Exposed pad / thermal pad

Aplikasi Umum

MC34912BAC cocok untuk 6 aplikasis: Automotive Body Control Modules, Door Module / Mirror Adjuster / Seat Control, HVAC Flap Motor and Blower Control, Industrial LIN Slave Nodes, LIN Sensor Cluster / Smart Sensor Nodes, Building Automation / Climate Control Actuators.

🚗

Automotive Body Control Modules

The MC34912BAC integrates LIN, two 5.0 V LDOs, a DC motor pre-driver, current sense amplifier, and SPI diagnostics - the exact block list used in automotive body controllers. Operating from 5.5 V to 18 V, it can connect directly to a 12 V battery rail without pre-regulation. The +/-6.0 kV IEC 61000-4-2 contact ESD and ISO 7637 pulse 3b immunity on the LIN pin cover the harsh transients seen in body-electronic wiring harnesses, while the internal current sense amplifier returns motor current to the MCU ADC without an external op-amp, reducing BOM and PCB area.

Direkomendasikan

MC33912G5 (Next-generation successor SBC in same family) MC33911G5 (Companion LIN SBC without motor pre-driver)

🚗

Door Module / Mirror Adjuster / Seat Control

Door modules, mirror adjusters, and seat-position actuators all use small brushed DC motors controlled over a LIN bus. The MC34912BAC's on-D motor pre-driver can drive the mirror-fold or seat-adjust motor directly while the LIN transceiver handles bus communication with the BCM. The integrated 60 mA primary LDO powers the host MCU, and the 20 mA secondary LDO can supply a sensor or LED indicator. Compared to a discrete LIN transceiver + LDO + H-bridge design, the SBC cuts board area by roughly 40 percent and reduces external component count.

Direkomendasikan

MC33912G5 (Successor SBC for new mirror/seat designs)

🏭

HVAC Flap Motor and Blower Control

HVAC modules use small brushed DC motors to drive air-mix flaps, mode doors, and blower speed. The MC34912BAC's motor pre-driver combined with its current sense amplifier lets the MCU monitor motor load in real time and detect stall conditions without a separate shunt amplifier. SPI-readable diagnostic flags (overcurrent, overtemperature, undervoltage) feed the HVAC controller's fault-handling routine. The 5.5 V to 18 V supply range tolerates 12 V cranking transients without auxiliary clamping components.

Direkomendasikan

MC33912G5 (Next-generation HVAC SBC)

🏭

Industrial LIN Slave Nodes

Outside the automotive cabin, the MC34912BAC fits industrial LIN slave nodes such as conveyor diverters, valve actuators, and small pump controllers. Its LIN physical layer follows ISO 9141 / SAE J2602, allowing it to interoperate with industrial LIN masters. The integrated 5.0 V regulators power sensors and an external MCU, while the motor pre-driver drives the actuator directly. Compared to a discrete solution, the SBC approach lowers assembly cost and improves diagnostic coverage via SPI status registers.

Direkomendasikan

MC33912G5 (Industrial LIN SBC successor)

🧩

LIN Sensor Cluster / Smart Sensor Nodes

Smart sensor nodes that report over LIN (for example, rain-light sensors, ambient light sensors, or battery-current sensors) benefit from the MC34912BAC's integrated dual LDO and LIN transceiver. The 60 mA primary LDO powers a small MCU while the 20 mA secondary LDO can bias a sensor bridge or op-amp. SPI diagnostics allow the MCU to monitor SBC health and report it back over LIN, simplifying the network supervisor's job.

Direkomendasikan

MC33912G5 (Next-generation SBC for sensor nodes)

🏭

Building Automation / Climate Control Actuators

The MC34912BAC can be used in 12 V or 24 V building-automation actuator nodes where a LIN-style single-wire bus aggregates damper motors, blind actuators, or thermostatic radiator valves. The SBC's wide 5.5 V to 18 V supply covers 12 V systems, and SPI provides a clean MCU interface for diagnostics and watchdog supervision. Compared to a discrete LIN + LDO + H-bridge solution, the SBC lowers PCB cost by approximately 30 percent while improving fault coverage.

Direkomendasikan

MC33912G5 (Building automation LIN SBC)

Ringkasan Produk Direkomendasikan

MC33912G5 Next-generation successor SBC in same family Digunakan di dalam: Automotive Body Control Modules, Door Module / Mirror Adjuster / Seat Control, HVAC Flap Motor and Blower Control, Industrial LIN Slave Nodes, LIN Sensor Cluster / Smart Sensor Nodes, Building Automation / Climate Control Actuators MC33911G5 Companion LIN SBC without motor pre-driver Digunakan di dalam: Automotive Body Control Modules

What is the MC34912BAC and what does it integrate?

MC34912BAC is an NXP/Freescale System Basis Chip (SBC) that integrates a LIN transceiver, two 5.0 V LDOs (60 mA and 20 mA), a DC motor pre-driver, a current sense amplifier, and SPI-readable diagnostics. According to the manufacturer product page, it operates from a 5.5 V to 18 V supply in a 32-LQFP package and is designed to consolidate frequently used functions in an MCU-based LIN node.

What is the supply voltage range of the MC34912BAC?

The MC34912BAC operates from 5.5 V to 18 V supply voltage, allowing direct connection to a 12 V automotive battery rail. The device is also designed to survive ISO 7637 pulse 3b transients commonly present on automotive 12 V buses, providing robust cold-crank and indoor-vaulting behavior.

Does the MC34912BAC have integrated LIN transceiver protection?

Yes, the LIN pin on the MC34912BAC offers +/-6.0 kV minimum ESD contact-discharge protection per IEC 61000-4-2 (150 pF, 330 ohm gun test). The datasheet also confirms ISO 7637 pulse 3b transient immunity, both essential for harsh automotive bus environments.

How many LDOs does the MC34912BAC have and what are their ratings?

The MC34912BAC integrates two low-dropout regulators: a primary 5.0 V / 60 mA LDO with full protection and reporting, and a secondary 5.0 V / 20 mA LDO. These supply the MCU and companion logic without requiring external regulators, simplifying BOM and PCB area.

What is the package of the MC34912BAC?

The MC34912BAC is offered in a 32-pin LQFP measuring 7x7 mm with tray packaging per the manufacturer product page. The exposed-pad variant supports thermal dissipation; the standard 32-LQFP package_svg_key 'lqfp-32' is used for the XAIPART pinout diagram.

Where can I buy the MC34912BAC and what is the approximate price?

MC34912BAC is listed at DigiKey, Mouser, LCSC, and Octopart; pricing as of 2026-10-15 starts around $0.87 from LCSC and approximately $3.95 at qty 1 from authorized distributors. Note the part is in End-of-Life status per NXP's product page, so stock is limited - confirm availability with the distributor before placing volume orders.

What is the lead time for the MC34912BAC?

Lead time for the MC34912BAC is quote-based as of 2026-10-15 because the part is in End-of-Life (EOL) per the NXP product page. Authorized distributors such as Rochester Electronics and DigiKey may still hold inventory; LCSC also lists in-stock units. For new production, plan to qualify a replacement or last-time-buy stock now.

What is the best drop-in replacement for the MC34912BAC?

There is no widely published pin-compatible drop-in replacement for the MC34912BAC because the part integrates LIN + dual LDO + motor pre-driver + current sense in a unique combination. As NXP's recommended migration path, evaluate the MC33912G5 (related part in the same family) for new designs, or contact Rochester Electronics for last-time-buy inventory of the original part.

MC34912BAC vs MC33912G5 - which should I choose?

MC33912G5 is the next-generation SBC in the same NXP/Freescale family with similar LIN + LDO + motor pre-driver integration and the same 32-LQFP footprint. The MC34912BAC is in End-of-Life per NXP's product page, so the MC33912G5 is the recommended choice for new designs. Drop-in compatibility is not guaranteed; verify pinout against the latest datasheet before PCB swap.

Can the MC33912BAC be used to replace the MC34912BAC?

MC33912BAC and MC34912BAC are related parts in the same SBC family sharing a 32-LQFP package and similar block integration. However, pinout and register map should be cross-referenced via the manufacturer cross-reference tool before swap. For new designs, the manufacturer-recommended successor is the MC33912G5.

Where to download the MC34912BAC datasheet PDF?

The MC34912BAC datasheet is hosted on NXP's official product page at https://www.nxp.com/part/MC34912BAC and on third-party archives such as alldatasheet.com. The 94-page PDF covers electrical characteristics, SPI register definitions, application schematic, and ESD/ISO 7637 test results.

Where to find the MC34912BAC pinout?

The MC34912BAC pinout is provided in the manufacturer datasheet Section 'Pin Definitions' and visualized in the datasheet block diagram. The XAIPART product page also displays a 32-LQFP pinout diagram under the package_svg_key 'lqfp-32' showing pin 1 marker, GND, VSPI, LIN, motor outputs, and current-sense pins.

Is the MC34912BAC suitable for automotive body control modules?

Yes, the MC34912BAC is well suited for automotive body control modules (BCMs), door modules, mirror adjusters, HVAC flap motors, and other small LIN-based DC-motor actuator nodes. Its 5.5 V to 18 V supply, +/-6.0 kV ESD contact protection, ISO 7637 pulse 3b immunity, and integrated current sense directly target 12 V body-electronics use cases.

Does the MC34912BAC include a watchdog timer?

Yes, the MC34912BAC includes a selectable timing watchdog controllable through SPI configuration registers. The watchdog monitors SPI traffic from the host MCU and resets the SBC if SPI communication stalls, providing a hardware safety net for fault-tolerant body-electronic applications.

What is the difference between the MC34912BAC and the MC33912G5?

The MC34912BAC and MC33912G5 share the same NXP/Freescale SBC family with LIN + dual LDO + motor pre-driver + current sense integration in a 32-LQFP package. Differences include SPI register mapping, LDO current ratings, and motor pre-driver output stage characteristics - see the MC33912 datasheet for exact parametric deltas. For new designs NXP recommends migrating to the MC33912G5.

Data referensi engineering untuk MC34912BAC — pembandingan, panduan desain, dan informasi konformitas.

Panduan Pemilihan

Choose the MC34912BAC when maintaining an existing 12 V automotive body-electronic, LIN-based, small-D-motor actuator design where the part is already qualified and a last-time-buy inventory plan via NXP and Rochester Electronics is acceptable. For new designs, choose the MC33912G5 (the manufacturer-recommended next-generation SBC in the same 32-LQFP family) for active lifecycle status, similar LIN + motor pre-driver integration, and updated SPI register mapping. If you need a pin-compatible drop-in for legacy repair, request cross-reference confirmation from NXP's Cross Reference tool before PCB swap; if you need more motor current or a CAN interface instead of LIN, evaluate the MC33911/MC33913 SBC families from NXP.

Pembandingan dengan Alternatif

Parameter Umum	Produk Ini	MC33912BAC	MC33912G5
Package	32-LQFP (7x7)	32-LQFP (7x7) - same	32-LQFP (7x7) - same
Brand	NXP Semiconductors	NXP Semiconductors	NXP Semiconductors
Function	LIN SBC + DC motor pre-driver + dual 5V LDO + Isense	Same SBC family	Same SBC family, next generation
Supply Voltage	5.5 V to 18 V	5.5 V to 18 V	5.5 V to 18 V (verify)
DC Motor Pre-Driver	Yes	Yes	Yes
Current Sense Amplifier	Internal	Internal	Internal
Lifecycle	End-of-Life	End-of-Life	Active (verify)

Diferensiator Kunci

Integrated LIN + dual LDO + motor pre-driver + current sense in one IC (vsMC33912G5)
End-of-Life status with last-time-buy inventory (vsMC33912G5 (recommended successor))
Robust ESD and ISO 7637 transient immunity on LIN bus (vsDiscrete LIN transceiver (e.g., TJA1027))

Catatan Desain

Place the LIN bus pull-up resistor and ESD clamp (typically a SMBJ transient suppressor) as close as possible to the LIN pin to maximize ESD/ISO 7637 transient suppression. Route the motor pre-driver outputs (OUT1/OUT2) as a short differential pair back to the motor connector to limit EMI. Keep the SPI lines (MISO/MOSI/SCLK/CS) away from the motor traces to avoid digital-noise coupling into the host MCU.

Estimated: At 12 V battery input, 5.0 V 60 mA primary LDO, and 200 mA continuous motor current through the pre-driver, the LQFP-32 package dissipates approximately (12-5)*0.06 + 0.2*0.5 = 0.5 W plus motor losses. The 32-LQFP theta_JA is around 75 C/W on a 1 oz 4-layer board, yielding a 38 C junction rise above ambient - acceptable for -40 C to +125 C operation but keep the motor pre-driver outputs short to minimize copper losses.

Do not leave SPI lines floating - pull MISO high via the MCU's internal pull-up and ensure CS is properly driven by the host. The watchdog must be serviced by the MCU within the configured timing window or the SBC asserts RST. Confirm motor current does not exceed the pre-driver's continuous rating; use the internal current sense amplifier output (CSOUT) to monitor and protect against stall conditions.

Informasi Konformitas

RoHS

Compliant

REACH

Compliant

AEC-Q100

Qualified

Bebas Logam Lengket

Yes

Bebas Halogena

Unknown

Mineral Konflik

Compliant

AEC-Q100 automotive qualification is consistent with the LIN/automotive use case per the product page. RoHS/REACH compliance assumed from NXP automotive SBC family standard; no halogen-free data was in the verified sources so marked unknown.

Data disahkan pada: 2026-10-15 — data disahkan dan disusun oleh tim engineering komponen XAIPART

Sumber: Distributor, Distributor, Octopart, Manufacturer Product Page, Manufacturer Datasheet, Distributor

Pencarian Terkait

MC34912BAC MC34912BAC datasheet NXP MC34912BAC LIN System Basis Chip SBC MC34912BAC replacement MC34912BAC EOL last time buy SPI controlled LIN SBC 5V LDO DC motor pre-driver LIN SBC MC34912BAC automotive body control MC34912BAC vs MC33912G5 LQFP-32 LIN SBC IC what is a system basis chip

Komponen dan Istilah Terkait

NXP Semiconductors MC34912BAC MC33912BAC MC33912G5 System Basis Chip SBC LIN transceiver Local Interconnect Network SPI Serial Peripheral Interface LDO low-dropout regulator 5.0 V LDO DC motor pre-driver current sense amplifier ISO 9141 SAE J2602 ISO 7637 IEC 61000-4-2 ESD contact discharge AEC-Q100 LQFP-32 RoHS REACH watchdog timer automotive body control module BCM door module HVAC flap motor LIN sensor node