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NXP Semiconductors MC33981ABHFKR2
- Part No.:
- MC33981ABHFKR2
- Manufacturer:
- NXP Semiconductors
- Package:
- 16-PowerQFN
- Datasheet:
-
MC33981ABHFKR2.pdf
- Description:
- IC PWR SWITCH N-CHAN 1:1 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,150
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Product details
Overview
MC33981ABHFKR2 from NXP Semiconductors is a single-channel, self-protected high-side switch with 4.0 mΩ RDS(ON) at 13 V VPWR and 25 °C, PWM-capable up to 60 kHz, and designed for automotive power distribution in harsh environments. It replaces electromechanical relays and fuses in motor, resistive, and inductive load control - including DC motors with high inrush current - while providing integrated over-current, over-temperature, under-voltage, and reverse-battery protection.
For engineers reviewing the MC33981ABHFKR2 datasheet, MC33981ABHFKR2 pinout, MC33981ABHFKR2 application, or MC33981ABHFKR2 equivalent, this device delivers precise high-side switching with output current monitoring (CSNS), temperature feedback (TEMP), fault reporting (FS), slew-rate control (SR), and configurable half-bridge operation via CONF/INLS/GLS interface - all in a thermally enhanced 16-pin PQFN (12 × 12 mm) package.
Technical Context
The MC33981ABHFKR2 integrates a high-frequency gate driver with bootstrap supply (CBOOT) and internal charge pump for continuous PWM operation. Its dual-control architecture supports independent high-side (INHS → OUT) and low-side (INLS → GLS) drive, with cross-conduction management enabled by the CONF pin - allowing either independent switching or synchronized half-bridge mode where INHS and INLS cannot be simultaneously active.
Protection logic includes fast over-current detection (tOCH ≤ 20 µs), self-recovering thermal shutdown (TSD = 175 °C typical), and latched fault reporting via open-drain FS. The device features reverse-battery survival down to −16 V, ground-disconnect protection, and programmable low-side overload threshold via OCLS resistor biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RDS(ON) max | 4.0 mΩ at VPWR = 13 V, IOUT = 20 A, TA = 25 °C - enables low conduction loss and minimal thermal rise in 40 A continuous applications |
| PWM frequency | Up to 60 kHz with 5–95% duty cycle - supports high-efficiency motor speed control without audible noise |
| Continuous output current | 40 A - rated for sustained loads including automotive window lifters and seat adjusters |
| Over-current threshold | 100 A typical for MC33981ABHFK variants - provides robust short-circuit protection with <20 µs response |
| Thermal resistance | RθJA = 30.0 °C/W - requires PCB copper area and thermal vias for full 40 A operation at 125 °C ambient |
| Supply voltage range | VPWR = 4.5–27 V - compatible with 12 V and 24 V automotive battery systems including cold-crank (4.5 V) |
| Sleep current | 5.0 µA at 25 °C - meets automotive module standby requirements per ISO 16750-2 |
Pinout & Package
MC33981ABHFKR2 is housed in a 16-pin PQFN (12 × 12 mm) with exposed thermal pad on the bottom side (VPWR connected internally to backside tab). Package complies with JEDEC MO-220, Pb-free (FK suffix), MSL3, and supports peak reflow up to 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CSNS | Current sense output | Provides ground-referenced analog voltage proportional to OUT current (CSR = 1/20000) for MCU ADC monitoring |
| TEMP | Temperature feedback | Analog output with negative TC (−8.9 mV/°C) referenced to GND flag - enables real-time board thermal monitoring |
| EN | Enable input (active high) | Logic-high entry into normal mode; internal 200 kΩ pull-down ensures safe default OFF state |
| INHS | High-side control input | CMOS-compatible signal directly controls OUT; internal 10 µA pull-down prevents floating |
| FS | Fault status output | Open-drain, active-low reporting of over-temp, over-current, or low-side overload faults |
| INLS | Low-side control input | Drives external N-channel MOSFET via GLS; supports independent or half-bridge operation |
| CONF | Cross-conduction config | 0 V = independent HS/LS control; 5 V = hardware-enforced dead-time to prevent shoot-through |
| OCLS | Low-side overload set | Bias pin with internal 100 µA current source - sets VDS trip level for external MOSFET via external resistor |
| DLS | Low-side drain monitor | Connects to drain of external MOSFET - enables VDS-based short-circuit detection |
| GLS | Low-side gate driver | 12 V clamped output capable of driving 10 mΩ MOSFETs at 60 kHz PWM |
| SR | Slew rate control | Accepts external capacitor to limit dV/dt at OUT - reduces EMI and voltage overshoot during switching |
| CBOOT | Bootstrap capacitor node | Connects to OUT via 100 nF capacitor - supplies gate drive energy for high-side N-channel MOSFET |
| GND | Ground reference | Common return for logic, analog, and power circuits; also serves as thermal path via exposed pad |
| VPWR | Power supply input | Main battery input (−16 to 41 V); backside thermal tab connects internally - must be soldered to PCB plane |
| OUT (pins 15,16) | High-side power output | Parallel pins deliver protected 40 A output; low-inductance layout required for PWM stability |
Key Features
| Feature | Design Value |
|---|---|
| Self-recovering thermal protection | Shuts OFF OUT at 175 °C junction; auto-resumes when temp falls below hysteresis threshold - eliminates manual reset in engine bay applications |
| Programmable slew rate | External SR capacitor adjusts VOUT rise/fall time from 400 ns to >1 µs - balances EMI suppression vs. switching loss |
| Reverse-battery survival | Operates safely at −16 V VPWR without external diodes - reduces BOM count and improves system reliability in jump-start scenarios |
| Half-bridge cross-conduction guard | CONF pin enables hardware-level dead-time enforcement - prevents shoot-through even if MCU firmware fails |
| Output current monitoring accuracy | ±15% CSR accuracy across 5–30 A range - enables closed-loop current limiting and diagnostic logging without shunt resistor |
| Low-side gate driver integration | Drives external MOSFET with 12 V clamp, 100 mA sink/source - supports efficient synchronous rectification in H-bridge motor drives |
Applications
| Automotive Seat Motor Control | Truck Cab Heater Blower |
|---|---|
Use Scenario: Bidirectional DC motor actuation for seat position adjustment with high inrush current (up to 35 A). IC Role / Device Role / Timing Role: High-side switch controlling motor power path; paired with external low-side MOSFET and CONF-enabled half-bridge mode for regenerative braking. Use Value: Eliminates relay wear-out and fuse replacement; 4.0 mΩ RDS(ON) limits heat rise to <10 °C at 30 A, enabling compact PCB design. | Use Scenario: Variable-speed blower fan in 24 V commercial vehicle HVAC system with wide ambient temperature range (−40 to 125 °C). IC Role / Device Role / Timing Role: PWM-controlled high-side power switch operating at 25 kHz to avoid audible noise; uses CSNS for stall detection and TEMP for thermal derating. Use Value: Replaces mechanical speed controller; 60 kHz PWM capability allows fine-grained airflow control while maintaining EMC compliance. |
| Off-Road Vehicle Winch Driver | Industrial Conveyor Belt Starter |
Use Scenario: Heavy-duty winch motor (12 V, 40 A peak) subjected to vibration, dust, and reverse-battery events during field service. IC Role / Device Role / Timing Role: Primary high-side switch with reverse-battery protection and ground-disconnect safety; FS pin feeds fault data to vehicle CAN gateway. Use Value: Survives −16 V battery reversal without damage; integrated OCLS/DLS monitoring detects MOSFET failure before cable burnout. | Use Scenario: Start-stop control of 3-phase induction motor starter contactor coil (resistive load, 15 A steady-state) in factory automation cabinet. IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical relay; EN pin synchronized with PLC output for controlled sleep/wake cycling. Use Value: 5 µA sleep current extends backup battery life; 40 A rating handles contactor inrush without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33883AER2 | Higher RDS(ON) (8.5 mΩ), lower max current (20 A), no low-side gate driver or OCLS functionality | Limited to simpler single-switch loads; lacks half-bridge support and external MOSFET coordination | Select when cost sensitivity outweighs need for diagnostics and dual-drive capability |
| TPS4H160-Q1 | Lower RDS(ON) (2.8 mΩ), integrated current sense amplifier, but no low-side gate driver or CONF-based cross-conduction guard | Better for precision current measurement; unsuitable for half-bridge motor control requiring GLS/CONF coordination | Prefer for high-accuracy load monitoring where external MOSFET control is unnecessary |
Compared with MC33981ABHFKR2, MC33883AER2 offers reduced integration and lower current handling, while TPS4H160-Q1 emphasizes sensing accuracy over system-level motor drive coordination - making MC33981ABHFKR2 uniquely suited for automotive half-bridge and regenerative braking applications.
Availability
MC33981ABHFKR2 is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor starters, and off-road equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC33981ABHFKR2 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 focused on automotive, industrial, and IoT applications, with deep expertise in high-reliability analog and power ICs.
The MC33981ABHFKR2 belongs to NXP's SBC (System Basis Chip) and high-side switch product line, engineered specifically for automotive power distribution modules requiring functional safety, thermal resilience, and diagnostic-rich operation in ASIL-B environments.
FAQ
What is the maximum continuous output current rating for the MC33981ABHFKR2?
The MC33981ABHFKR2 is rated for 40 A continuous output current under specified thermal conditions (RθJA = 30.0 °C/W, TA ≤ 125 °C). This rating assumes proper PCB thermal design with adequate copper area and vias connected to the exposed VPWR tab. At higher ambient temperatures or reduced heatsinking, derating is required per the RDS(ON) vs. temperature curve in the datasheet.
Does the MC33981ABHFKR2 support true PWM operation, and what is its maximum frequency?
Yes, the MC33981ABHFKR2 supports full PWM operation up to 60 kHz with duty cycle adjustable from 5% to 95%. It achieves this using an internal charge pump and bootstrap capacitor (CBOOT) circuit, enabling sustained high-side switching without gate drive dropout. The device maintains stable operation across the full VPWR range (4.5–27 V) and temperature range (−40 to 125 °C).
How does the MC33981ABHFKR2 implement reverse-battery protection?
The MC33981ABHFKR2 survives reverse-battery conditions down to −16 V without external components. During reverse polarity, its internal circuitry enhances the high-side MOSFET gate to minimize power dissipation and prevent latch-up. This feature is validated per ISO 16750-2 and eliminates the need for external blocking diodes - reducing system cost and footprint while maintaining reliability in jump-start and battery-reversal scenarios.
Can the MC33981ABHFKR2 drive an external low-side MOSFET, and how is it configured?
Yes, the MC33981ABHFKR2 includes a dedicated low-side gate driver (GLS) and control interface (INLS, CONF, OCLS, DLS) to drive an external N-channel MOSFET. Configuration is managed via the CONF pin: at 0 V, INHS and INLS operate independently; at 5 V, hardware-enforced dead-time prevents cross-conduction. The OCLS pin sets the VDS trip level using an external resistor, enabling customizable short-circuit protection for the external MOSFET.
What diagnostic functions does the MC33981ABHFKR2 provide, and how are they reported?
The MC33981ABHFKR2 provides three primary diagnostics: over-temperature (via TEMP pin voltage and FS assertion), over-current on OUT (latched, reset by INHS low pulse), and low-side overload (latched, reset by INLS low pulse). All faults are reported on the open-drain FS pin, which pulls low during active fault. The CSNS and TEMP pins deliver analog feedback for MCU-based health monitoring, enabling predictive maintenance and adaptive control strategies in the MC33981ABHFKR2 system.
MC33981ABHFKR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 16-PowerQFN
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Switch Type:
- General Purpose
- Number of Outputs:
- 1
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- High Side
- Output Type:
- N-Channel
- Interface:
- PWM
- Voltage - Load:
- 6V ~ 27V
- Voltage - Supply (Vcc/Vdd):
- -
- Current - Output (Max):
- 40A
- Rds On (Typ):
- 4mOhm
- Input Type:
- -
- Features:
- Slew Rate Controlled
- Fault Protection:
- Current Limiting (Fixed), Over Temperature
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HQFN (12x12)
MC33981ABHFKR2 FAQ
1.How can I place an order for MC33981ABHFKR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33981ABHFKR2 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 MC33981ABHFKR2 reliable?
The price and inventory of MC33981ABHFKR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33981ABHFKR2 is usually 5 days.
3.What payment methods are accepted for MC33981ABHFKR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33981ABHFKR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33981ABHFKR2?
MC33981ABHFKR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33981ABHFKR2 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 MC33981ABHFKR2?
For technical support, including MC33981ABHFKR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33981ABHFKR2 requirements.
6.How does Aetrix verify that MC33981ABHFKR2 is sourced from the original manufacturer or authorized distributors?
All MC33981ABHFKR2 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 MC33981ABHFKR2 meets industry standards.
7.What is the process for return or replacement of MC33981ABHFKR2?
All MC33981ABHFKR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC33981ABHFKR2, 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 MC33981ABHFKR2 part is unused and in its original packaging.
Return procedure for MC33981ABHFKR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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