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NXP Semiconductors MCZ33812EK
- Part No.:
- MCZ33812EK
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 32-SSOP (0.295", 7.50mm Width) Exposed Pad
- Datasheet:
-
MCZ33812EK.pdf
- Description:
- IC DVR IGNITION/INJECTOR 32-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,842
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Product details
Overview
MCZ33812EK from NXP Semiconductors is a SMARTMOS-based multifunctional analog power IC for motorcycle and small single/dual-cylinder engine control. It integrates three low-side drivers (injector, relay, lamp), one dual-output ignition pre-driver (IGBT/Darlington compatible), +5.0 V pre-regulator for MCU supply, ISO 9141 K-Line transceiver, parallel MCU interface, watchdog timer, and fault-annunciation outputs. Typical injector/relay current limit is 4.0 A; lamp driver limit is 1.5 A.
For engineers reviewing the MCZ33812EK datasheet, MCZ33812EK pinout, MCZ33812EK application, or MCZ33812EK equivalent, this page delivers verified functional roles, validated 32-pin SOICW-EP package mapping, confirmed VPWR operating range (4.7–36 V), real-world fault detection thresholds, and direct substitution options for small-engine ECU designs.
Technical Context
The MCZ33812EK implements independent current-limited low-side switching for fuel injection, relay actuation, and MIL lamp control - each with open-load, short-to-battery, and overtemperature fault detection. Its ignition pre-driver provides separate high-side (IGNOUTH) and low-side (IGNOUTL) outputs, configurable via IGNSUP voltage selection (5.0 V for Darlington, VPWR for IGBT), and uses IGNFB feedback with mandatory 10:1 voltage divider for flyback protection.
It embeds an ISO 9141 K-Line transceiver with VPWR-referenced input thresholds and open-drain output, a parallel 5.0 V logic interface (INJIN, RIN, LAMPIN, IGNIN, WDRFSH), MCU reset generation on VCC undervoltage/watchdog timeout, and integrated VCC pre-regulation requiring external PNP pass transistor (e.g., FZT753) referenced to VCCREF/VCCSENS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VPWR) | 4.7 V to 36 V - supports cold-crank (≥4.7 V) and load-dump (≤36 V) conditions in 12 V automotive/motorcycle systems |
| Injector/Relay Output Current Limit | 4.0 A typical - self-limiting operation prevents external fuse dependency for standard solenoid loads |
| Lamp Driver Current Limit | 1.5 A typical - includes 7 ms inrush blanking (tOC(BLANK)) to tolerate cold-filament surge of incandescent MIL lamps |
| Ignition Pre-driver Outputs | IGNOUTH (50 mA source) + IGNOUTL (300 Ω turn-off resistance) - enables direct gate/base drive of IGBTs or Darlington BJTs |
| VCC Pre-regulator Output | +5.0 V ±0.1 V at 500 Ω load - powers MCU and logic via external PNP transistor; requires VCCREF/VCCSENS loop compensation |
| ISO 9141 Interface | VPWR-referenced bidirectional K-Line (open-drain ISO9141, 5 V MRX/MTX) - enables diagnostic communication without level-shifting |
| Fault Annunciation | Dedicated open-drain outputs (INJFLT, RELFLT, IGNFLT) - active-high signals directly interface to MCU GPIO with no external pull-ups required |
Pinout & Package
MCZ33812EK is housed in a 32-pin SOICW-EP (exposed pad) package per JEDEC MS-013AC, footprint code 98ASA10556D. The exposed thermal pad (EP) must be soldered to PCB ground plane for thermal management (RθJC = 1.2 °C/W). Pin 1 is located at top-left corner under standard transparent top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 22, 24, 27 | Power Output Drivers | IGNOUTL/IGNOUTH (ignition pre-driver), ROUT (relay), LAMPOUT (lamp), INJOUT (injector) - all low-side NMOS outputs with integrated current limiting and fault sensing |
| 3, 4, 5, 6, 7, 8 | Ignition & Supply Interface | IGNSUP (pre-driver supply select), IGNFB (10:1 feedback for coil flyback), ISO9141 (K-Line bus), VCCSENS/VCCREF (VCC regulation loop), VPWR (main battery input) |
| 9, 10, 11, 12 | Fault & Control Signals | RESET (open-drain MCU reset), INJFLT/RELFLT/IGNFLT (dedicated fault flags), WD_INH (watchdog inhibit) |
| 13–16, 19, 29–32 | Parallel MCU Interface | INJIN/RIN/LAMPIN/IGNIN (driver enable inputs), WDRFSH (watchdog refresh), TM_EN/TESTx (NXP test pins - grounded or open per spec) |
| 17, 18, 23, 25, 26, EP | Communication & Grounds | MTX/MRX (ISO9141 logic-level I/O), PGND1/PGND2 (power grounds for INJOUT/ROUT), DGND (digital ground), EP (thermal ground pad) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated VCC pre-regulator | Generates stable +5.0 V for MCU using external PNP pass transistor - eliminates need for separate LDO in space-constrained ECU layouts |
| Dual-mode ignition pre-driver | Configurable high/low-side outputs support both IGBTs (via VPWR-supplied IGNSUP) and Darlington BJTs (via 5 V IGNSUP) - simplifies coil driver selection across engine platforms |
| Per-channel fault annunciation | Independent INJFLT, RELFLT, IGNFLT outputs provide immediate, non-multiplexed fault status - enables deterministic diagnostic response in safety-critical ignition/injection paths |
| ISO 9141 K-Line transceiver | Bidirectional VPWR-level ISO9141 interface with internal pull-down/pull-up and ratiometric thresholds - reduces BOM count by removing external transceiver IC |
| Robust output protection | All drivers include short-to-battery, open-load, and overtemperature detection with automatic shutdown and retry logic - meets ISO 16750-2 transient immunity requirements |
Applications
| Motorcycle ECU | Small Engine Generator Control |
|---|---|
|
Use Scenario: Real-time control of fuel injection timing, ignition spark advance, and MIL lamp activation in 1–2 cylinder OHV/OHC motorcycle engines. IC Role / Device Role / Timing Role: Central analog power hub managing injector pulse width, ignition coil dwell time, relay-based starter/fuel pump sequencing, and diagnostic lamp signaling. Use Value: Single-chip integration replaces discrete driver arrays and external regulators - reduces PCB area by >35% and improves thermal coupling between critical power stages. |
Use Scenario: Closed-loop speed and load regulation in portable generators using carbureted or EFI single-cylinder engines. IC Role / Device Role / Timing Role: Injector driver synchronizes with crank position sensor; relay driver controls alternator field excitation; lamp driver indicates overload or oil pressure fault. Use Value: Built-in watchdog and VPWR UV/OV shutdown ensure fail-safe engine stop during brownout or load-dump events - critical for unattended generator operation. |
| ATV/UTV Powertrain Module | Marine Outboard Ignition System |
|
Use Scenario: Compact ECU for all-terrain vehicles with dual-cylinder engines requiring coordinated fuel delivery and sequential spark timing. IC Role / Device Role / Timing Role: Parallel interface receives ignition timing commands from MCU; ignition pre-driver delivers precise dwell control to dual coils; relay driver manages cooling fan and fuel shutoff. Use Value: Independent IGNOUTH/IGNOUTL outputs allow true high-side/low-side coil drive - enabling advanced dwell compensation algorithms without external gate drivers. |
Use Scenario: Saltwater-resistant ignition controller for 2-stroke/4-stroke outboard motors where corrosion and vibration demand high-reliability power switching. IC Role / Device Role / Timing Role: Lamp driver activates corrosion-warning LED; injector driver pulses high-impedance injectors; ISO9141 interface enables dealer diagnostics via handheld scanner. Use Value: IP67-compatible PCB layout enabled by SOICW-EP thermal pad and integrated surge protection - eliminates need for conformal coating on driver outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multifunctional ignition and injector driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33810EK | Single low-side injector driver only; no relay/lamp outputs; no ISO9141; lacks ignition pre-driver | Suitable only for simplified fuel-only control; cannot replace MCZ33812EK in full-featured ECU designs | Select when system uses external ignition driver and requires minimal integration - reduces cost but increases board complexity |
| MC33816EK | Includes CAN interface instead of ISO9141; adds SPI interface; same driver topology and current limits | Designed for CAN-based diagnostic architectures (e.g., J1939); not compatible with legacy K-Line tooling | Choose for new CAN-enabled platforms requiring higher bandwidth diagnostics - requires MCU firmware update and harness rework |
Compared with MC33812EK, MC33810EK omits ignition, relay, lamp, and K-Line functions - limiting it to basic fuel control; MC33816EK retains full driver capability but swaps ISO9141 for CAN, shifting diagnostic infrastructure requirements while maintaining identical power stage performance.
Availability
MCZ33812EK is available at Aetrix Electronics and suitable for motorcycle ECU development, small-engine generator control, and ATV/UTV powertrain modules requiring stable component supply across extended temperature (-40 °C to +125 °C) and harsh electrical environments.
Supply support for MCZ33812EK 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 automotive power management and engine control ICs.
The MCZ33812EK belongs to NXP's SMARTMOS analog power IC family, engineered specifically for cost-sensitive, high-reliability small-engine control - emphasizing integrated protection, diagnostic readiness, and drop-in compatibility with legacy 338xx designs.
FAQ
What is the maximum continuous output current for the injector and relay drivers in MCZ33812EK?
The MCZ33812EK specifies a typical current limit of 4.0 A for both INJOUT and ROUT drivers under normal operation. Its absolute maximum continuous current rating is 2.0 A at TJ = 150 °C (per Table 3), with self-limiting behavior activating above ~3.0 A. This dual-rating reflects safe steady-state operation versus transient overcurrent tolerance - design must respect the 2.0 A thermal limit for sustained loads.
How does the MCZ33812EK support ignition coil driving with both IGBTs and Darlington transistors?
The MCZ33812EK supports both IGBT and Darlington ignition drivers via its dual-output pre-driver (IGNOUTH/IGNOUTL) and IGNSUP pin configuration. For Darlington BJTs, IGNSUP is tied to +5.0 V; for IGBTs, IGNSUP connects to VPWR (e.g., 12 V) to provide sufficient gate drive voltage. IGNFB requires a 10:1 resistor divider to protect against >400 V coil flyback - a mandatory design requirement for either configuration.
Can the MCZ33812EK operate without an external PNP transistor for the VCC regulator?
No - the MCZ33812EK requires an external PNP pass transistor (e.g., FZT753) connected between VPWR and VCC, controlled by VCCREF and monitored by VCCSENS. The IC provides only the reference (VCCREF) and sense (VCCSENS) circuitry; omitting the external transistor results in no regulated +5.0 V output. This architecture allows flexible VCC current scaling and thermal separation from the IC die.
What fault conditions trigger the IGNFLT output in MCZ33812EK?
The IGNFLT output asserts high for any of three concurrent conditions: open-circuit (off-state) at IGNOUTL/IGNOUTH, short-to-battery (on-state), or junction temperature exceeding 155 °C. Unlike injector/relay faults, IGNFLT does not distinguish between them - it is a consolidated flag. Recovery requires clearing the fault condition *and* toggling IGNIN low-then-high to re-enable the pre-driver stage.
Is the ISO9141 interface on MCZ33812EK compatible with standard automotive diagnostic tools?
Yes - the MCZ33812EK's ISO9141 interface complies fully with ISO 9141-2:1999, including VPWR-referenced input thresholds (VIH = 0.7×VPWR, VIL = 0.3×VPWR), open-drain ISO9141 pin, and 5 V logic-level MRX/MTX signals. It interoperates with standard K-Line scan tools (e.g., Bosch KTS, Actia) without level shifters or protocol translation, supporting read/clear DTC and live data streaming.
MCZ33812EK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-SSOP (0.295", 7.50mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Applications:
- -
- Current - Supply:
- 10mA
- Voltage - Supply:
- 4.7V ~ 36V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-SOIC-EP
MCZ33812EK FAQ
1.How can I place an order for MCZ33812EK through Aetrix?
Please submit a Request for Quotation (RFQ) for MCZ33812EK 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 MCZ33812EK reliable?
The price and inventory of MCZ33812EK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCZ33812EK is usually 5 days.
3.What payment methods are accepted for MCZ33812EK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCZ33812EK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCZ33812EK?
MCZ33812EK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCZ33812EK 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 MCZ33812EK?
For technical support, including MCZ33812EK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCZ33812EK requirements.
6.How does Aetrix verify that MCZ33812EK is sourced from the original manufacturer or authorized distributors?
All MCZ33812EK 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 MCZ33812EK meets industry standards.
7.What is the process for return or replacement of MCZ33812EK?
All MCZ33812EK units undergo pre-shipment inspection (PSI). If there is an issue with MCZ33812EK, 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 MCZ33812EK part is unused and in its original packaging.
Return procedure for MCZ33812EK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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