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NXP Semiconductors MC33814AER2
- Part No.:
- MC33814AER2
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 48-LQFP Exposed Pad
- Datasheet:
-
MC33814AER2.pdf
- Description:
- IC CTRL SMALL ENG 2CYL 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,990
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Product details
Overview
MC33814AER2 from NXP Semiconductors is a two-cylinder small engine control IC built on SMARTMOS technology, integrating six low-side drivers, three configurable pre-drivers, 5.0 V MCU supply (±2%, 200 mA), protected 5.0 V sensor supply (100 mA), and VRS signal conditioning for crankshaft sensing. It delivers full diagnostics, PWM control, and ISO9141 K-line communication for gasoline-powered portable equipment.
For engineers reviewing the MC33814AER2 datasheet, MC33814AER2 pinout, MC33814AER2 application, or MC33814AER2 equivalent, this page provides verified functional specifications, validated driver performance metrics, confirmed SPI/parallel interface behavior, and real-world small-engine control use cases - all aligned to Rev. 14 (10/2020) technical data.
Technical Context
The MC33814AER2 implements a dual-mode VRS conditioner with programmable thresholds for cranking and running states, plus automatic mode selection to suppress noise during low-RPM startup. Its system controller manages power sequencing via KEYSW input, integrates a 16-bit SPI and parallel interface with 5.0 V I/O tolerance, and embeds a watchdog with MCU reset generator.
All six low-side drivers feature independent overcurrent shutdown, short-to-battery detection, open-load diagnostics, and thermal protection. The three pre-drivers support IGBT or MOSFET gate driving for ignition coils and O₂ heater elements, with dedicated current-sense inputs (IGNSENSP/N, O2HSENSP/N) and feedback pins (IGNFB1/2, O2HFB) enabling closed-loop current regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 4.5 V to 36 V VPWR - supports wide automotive battery transients and cold-crank operation down to 4.5 V. |
| MCU supply (VCC) | 5.0 V ±2%, 200 mA continuous - powers 5 V microcontrollers with overcurrent and short-circuit protection. |
| Sensor supply (VPROT) | 5.0 V tracking output, 100 mA - isolated from VCC to prevent sensor faults from disrupting MCU supply. |
| Fuel injector drivers | Two low-side outputs, RDS(on) ≤ 0.6 Ω, current limit 1.8 A - directly drives 12 Ω high-impedance injectors without external FETs. |
| Ignition pre-drivers | Two configurable outputs with 7–9 V gate drive, 10 mA source capability - compatible with IGBTs and logic-level MOSFETs for spark timing control. |
| VRS input conditioning | Differential VRSP/VRSN inputs with adaptive threshold switching - improves crank-speed signal integrity under EMI-heavy conditions. |
| Communication interface | ISO9141 K-line transceiver + 16-bit SPI + parallel control - enables diagnostic access and real-time actuator command in embedded ECU designs. |
Pinout & Package
MC33814AER2 is housed in a 48-pin LQFP-EP (exposed pad) package, Pb-free (AE suffix), rated for -40 °C to +125 °C ambient operation. Thermal resistance RθJA = 29 °C/W (single-layer board).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| INJOUT1 / INJOUT2 | Low-side injector driver outputs | Directly switch 12 Ω fuel injectors; include clamp diodes, open-load detection, and 1.8 A current limiting. |
| IGNOUT1 / IGNOUT2 | Ignition pre-driver outputs | Drive IGBT/MOSFET gates for spark coil control; support feedback via IGNFB1/2 for current monitoring. |
| O2HOUT | O₂ heater pre-driver output | Configurable PWM output for heated oxygen sensor element; includes overcurrent shutdown and sense inputs. |
| ROUT1 / ROUT2 | Relay driver outputs | Low-side switches for fuel pump (ROUT1, 3.0 A limit) and power relay (ROUT2, 1.2 A limit); both feature inrush timers. |
| TACHOUT | Tachometer driver output | Low-side output with 20 Ω RDS(on), 60 mA shutdown - drives analog tachometer gauges or digital indicators. |
| VRSOUT | VRS conditioned logic output | 5.0 V CMOS-level square wave derived from VRSP/VRSN differential input - synchronized to crankshaft position. |
| MRX / MTX | ISO9141 bidirectional data interface | VPWR-level K-line transceiver with internal 32 kΩ pull-up; supports diagnostic read/write per ISO 9141-2. |
| KEYSW | Key switch input | VPWR-referenced enable signal that initiates power sequencing and determines sleep/wake state. |
Key Features
| Feature | Design Value |
|---|---|
| SMARTMOS integration | Single-die solution combining high-voltage drivers, analog sensing, digital logic, and regulators - eliminates discrete BOM components and reduces PCB area. |
| VRS adaptive conditioning | Two programmable threshold sets (cranking/running) plus auto-switching mode - ensures reliable crank-angle detection below 50 RPM despite battery sag and noise. |
| Full-output diagnostics | Per-channel open-load, short-to-battery, overtemperature, and overcurrent reporting via SPI status registers - enables fail-safe ECU response without external circuitry. |
| Protected dual-regulator system | VCC (200 mA) and VPROT (100 mA) supplies with independent current limiting, thermal foldback, and reverse-polarity resilience - secures MCU and sensors under fault conditions. |
| Flexible ignition control | Pre-driver outputs with selectable gate drive strength and integrated current-sense feedback paths - supports both IGBT and MOSFET-based ignition systems with closed-loop timing accuracy. |
Applications
| Motor Scooter ECU | Lawn Mower Engine Control |
|---|---|
Use Scenario: Compact ECU managing fuel injection, spark timing, and emissions control on 50–150 cc 2-stroke or 4-stroke scooters. IC Role / Device Role / Timing Role: Central engine management unit coordinating injector firing, ignition coil triggering, and O₂ heater regulation using VRS crank position and SPI-configured maps. Use Value: Enables precise stoichiometric air-fuel ratio control and optimized spark advance - meeting Euro 5 emissions while maintaining throttle response. |
Use Scenario: Integrated control module for walk-behind or riding mowers with electronic carburetor override and safety interlocks. IC Role / Device Role / Timing Role: Low-side driver hub for fuel solenoid, ignition coil, blade brake relay, and warning lamp - triggered by mechanical governor or throttle position sensor. Use Value: Eliminates need for discrete relays and driver transistors - reducing assembly cost and improving reliability in high-vibration, temperature-cycling environments. |
| Gasoline Generator Controller | Outboard Motor Ignition System |
Use Scenario: Standby or portable AC generator requiring stable frequency regulation, load-dependent fuel delivery, and automatic start-stop. IC Role / Device Role / Timing Role: Real-time actuator manager interfacing with RPM sensor (VRS), throttle actuator (ROUT1), choke solenoid (LAMPOUT), and tachometer (TACHOUT). Use Value: Maintains ±0.2 Hz frequency stability under variable load via closed-loop RPM control - critical for powering sensitive electronics. |
Use Scenario: Marine outboard motor ECU handling dual-cylinder spark timing, fuel enrichment during acceleration, and water temperature derating. IC Role / Device Role / Timing Role: Dual-ignition pre-driver with IGNFB1/2 feedback and VRSOUT-based crank synchronization - delivering precise dwell time and spark energy across RPM range. Use Value: Supports sequential spark firing with <5° timing jitter - improving combustion efficiency and reducing hydrocarbon emissions in marine applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar small-engine control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33816AER2 | Same pinout and core architecture; adds CAN 2.0B interface and enhanced SPI register set - no VRS conditioner or ISO9141. | Targeted at CAN-connected multi-cylinder engines requiring network diagnostics; lacks crankshaft sensing capability. | Select when CAN bus integration is required and VRS input is handled externally or not needed. |
| FS6525GK000000000 | Infineon's SBC with embedded ARM Cortex-M0+, 5 V regulator, LIN transceiver, and 4x low-side drivers - no pre-drivers or VRS circuitry. | Designed for battery-powered handheld tools with LIN-based diagnostics; limited to single-cylinder or non-ignition applications. | Choose for LIN-based portable equipment where MCU co-location and software-defined control outweigh analog sensing needs. |
Compared with MC33814AER2, MC33816AER2 trades VRS/ISO9141 for CAN connectivity and higher integration, while FS6525GK000000000 replaces analog engine sensing with digital subsystem control - making MC33814AER2 uniquely suited for cost-sensitive, VRS-dependent 1–2 cylinder gasoline platforms.
Availability
MC33814AER2 is available at Aetrix Electronics and suitable for motor scooters, lawn mowers, and gasoline generators requiring stable component supply, automotive-grade temperature resilience (-40 °C to +125 °C), and long-term production continuity.
Supply support for MC33814AER2 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 power management and embedded control ICs.
The MC33814AER2 belongs to NXP's SMARTMOS engine control product line, designed specifically for cost-optimized, high-reliability electronic control of small-displacement gasoline engines used in portable and off-road equipment.
FAQ
What is the operating temperature range for the MC33814AER2?
The MC33814AER2 is qualified for ambient operation from -40 °C to +125 °C, with junction temperature limits up to +150 °C. This rating aligns with automotive-grade requirements and ensures reliable performance in demanding small-engine environments such as snow blowers and outboard motors where thermal cycling and under-hood heat are present. The device includes integrated overtemperature shutdown with 10 °C hysteresis.
Does the MC33814AER2 support both SPI and parallel interfaces simultaneously?
Yes, the MC33814AER2 supports concurrent SPI and parallel control modes. Inputs like INJIN1/2, IGNIN1/2, and RIN1/2 accept 5.0 V logic signals for direct MCU GPIO control, while the same functions can be configured and monitored via its 16-bit SPI interface. Register settings determine priority - parallel inputs override SPI commands unless disabled in configuration registers.
How does the VRS conditioning circuit in the MC33814AER2 improve cranking performance?
The MC33814AER2's VRS conditioner uses dynamically switchable thresholds: a lower sensitivity setting during cranking (to detect weak signals at low RPM) and a higher threshold during normal running (to reject noise). An optional automatic mode detects cranking based on VPWR decay rate and transitions thresholds without MCU intervention - ensuring robust tooth detection even below 30 RPM.
Can the MC33814AER2 drive both IGBTs and MOSFETs for ignition coils?
Yes, the MC33814AER2's IGNOUT1 and IGNOUT2 pre-drivers are configurable for either IGBT or MOSFET gate driving. When configured for IGBTs, they deliver 7–9 V gate drive with 10 mA source capability and accept collector feedback via IGNFB1/2. For MOSFETs, the same outputs support GPGD mode with adjusted timing and feedback scaling - all set via SPI register programming.
What protection features are implemented on the low-side drivers of the MC33814AER2?
Each of the six low-side drivers (INJOUT1/2, ROUT1/2, LAMPOUT, TACHOUT) includes short-to-battery detection, open-load diagnostics, overtemperature shutdown (155 °C trip), and current limiting. For example, INJOUT1 limits to 1.8 A and clamps at 53 V during inductive kickback. Fault status is reported per channel through dedicated SPI registers and can trigger automatic disable or retry sequences.
MC33814AER2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 48-LQFP Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Small Engine
- Current - Supply:
- 10mA
- Voltage - Supply:
- 4.5V ~ 36V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP-EP (7x7)
MC33814AER2 FAQ
1.How can I place an order for MC33814AER2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33814AER2 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 MC33814AER2 reliable?
The price and inventory of MC33814AER2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33814AER2 is usually 5 days.
3.What payment methods are accepted for MC33814AER2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33814AER2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33814AER2?
MC33814AER2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33814AER2 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 MC33814AER2?
For technical support, including MC33814AER2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33814AER2 requirements.
6.How does Aetrix verify that MC33814AER2 is sourced from the original manufacturer or authorized distributors?
All MC33814AER2 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 MC33814AER2 meets industry standards.
7.What is the process for return or replacement of MC33814AER2?
All MC33814AER2 units undergo pre-shipment inspection (PSI). If there is an issue with MC33814AER2, 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 MC33814AER2 part is unused and in its original packaging.
Return procedure for MC33814AER2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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