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NXP Semiconductors MC33984EHFK
- Part No.:
- MC33984EHFK
- Manufacturer:
- NXP Semiconductors
- Package:
- 16-PowerQFN
- Datasheet:
-
MC33984EHFK.pdf
- Description:
- IC PWR SWITCH N-CHAN 1:2 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,003
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Product details
Overview
MC33984EHFK from NXP Semiconductors is a dual intelligent high-side power switch with 4.0 mΩ RDS(on) at 15 A and 13 V, SPI-programmable overcurrent thresholds (7.5–25 A), and integrated self-protection for automotive power distribution. It replaces electromechanical relays and fuses in harsh-environment motor, solenoid, and lighting control systems.
For engineers reviewing the MC33984EHFK datasheet, MC33984EHFK pinout, MC33984EHFK application, or MC33984EHFK equivalent, this page delivers verified technical context, real-world timing behavior (e.g., 0.08–155 ms overcurrent blanking), thermal shutdown at 175 °C, and validated alternative part selection guidance - all grounded in NXP Rev. 17.0 (07/2023) specifications.
Technical Context
The MC33984EHFK implements dual independent high-side outputs with programmable slew rates (0.15–5.8 V/µs), configurable watchdog timeout (310–2500 ms), and selectable open-load detection. Its internal regulator powers digital logic from VPWR (6–27 V), while VDD (4.5–5.5 V) supplies only the SPI interface.
SPI control enables real-time configuration of overcurrent trip levels, fault blanking times, output delay (0–525 ms), and current sense ratio (1/19900 or 1/39600). Parallel direct inputs (IN0/IN1) support PWM or hardwired control without SPI involvement - critical for fail-safe motor actuation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RDS(on) | 4.0 mΩ max at 15 A, 13 V, TJ = 25 °C - enables low conduction loss and minimal thermal rise in 30 A peak load applications |
| Output Clamp Energy | 0.3 J - specified for inductive load switching with L = 16 mH, VPWR = 12 V, TJ = 150 °C; defines safe energy dissipation during turn-off |
| Overcurrent Threshold | Configurable 7.5–25 A via SPI - allows precise trip point tuning to match motor inrush or solenoid hold current |
| Overcurrent Blanking Time | 0.08–155 ms (SPI-selectable) - suppresses false trips during transient inrush while preserving fast fault response |
| Watchdog Timeout | 310–2500 ms (SPI-selectable) - ensures system-level supervision without requiring MCU intervention during sleep |
| Operating Voltage | VPWR: 6.0–27 V; VDD: 4.5–5.5 V - supports wide automotive battery range and isolated SPI domain |
| Thermal Shutdown | 175 °C typical (160–190 °C range) - protects against sustained overload or poor heatsinking in under-hood environments |
Pinout & Package
MC33984EHFK is housed in a 16-pin PQFN package (12 mm × 12 mm, non-leaded, exposed thermal tab) optimized for high-power dissipation in automotive PCB layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| HS0 / HS1 | High-side power outputs | Protected 4.0 mΩ switches driving loads directly from VPWR; each supports 30 A continuous current with active current limiting |
| CSNS | Current sense output | Provides proportional current signal (1/19900 or 1/39600 ratio) for MCU ADC monitoring - enables closed-loop load diagnostics |
| IN0 / IN1 | Direct control inputs | CMOS-level parallel inputs enabling immediate ON/OFF or PWM control of HS0/HS1 - bypasses SPI latency for time-critical actuation |
| FS | Fault status output | Open-drain active-low flag signaling overcurrent, open/short load, overtemperature, or undervoltage - requires external VDD pull-up |
| FSI | Fail-safe input | Resistor-programmed pin defining output state (OFF, ON, or HS0-only) after watchdog timeout - enables hardware-defined safety behavior |
| VPWR | Main power supply input | Backside-exposed tab delivering operational power to analog and protection circuitry; rated -16 V to 41 V for reverse polarity robustness |
| VDD | Digital supply input | 5 V domain powering SPI interface only; internal regulator maintains partial functionality if VDD is lost |
| CS / SCLK / SI / SO | SPI interface signals | Full-duplex 3.0 MHz SPI bus supporting daisy-chaining; SO tri-states when CS is high to enable multi-device sharing |
| RST / WAKE | System control inputs | RST initializes registers and enters sleep mode (<5 µA); WAKE enables watchdog timer - both include internal pull-downs |
Key Features
| Feature | Design Value |
|---|---|
| Dual 4.0 mΩ high-side switches | Enables compact replacement of two 40 A relays with <1.0 °C/W junction-to-case thermal resistance - reduces board space and contact bounce issues |
| SPI-configurable overcurrent protection | Eight selectable low-trip levels (6.0–30 A) and two high-trip levels (75–100 A) allow precise matching to load profiles across vehicle variants |
| Programmable slew rate control | Four rising/falling combinations (0.15–5.8 V/µs) mitigate EMI during switching while preventing voltage overshoot on long harnesses |
| Self-recovery fault management | Automatically resumes operation after overtemperature or overcurrent events clear - eliminates need for manual reset in inaccessible locations |
| Reverse polarity protection | -16 V VPWR rating with internal clamp - withstands jump-start conditions and battery reversal without external components |
Applications
| DC Motor Control | Solenoid Actuation |
|---|---|
|
Use Scenario: Controlling 12 V brushed DC motors in HVAC blend door actuators and seat positioners. IC Role / Device Role / Timing Role: Dual high-side switch providing independent, current-limited drive to two motor windings with synchronized PWM via IN0/IN1. Use Value: Eliminates relay chatter and fuse replacement; 0.08 ms overcurrent blanking prevents nuisance trips during motor startup inrush. |
Use Scenario: Driving 24 V solenoids in transmission shift control and fuel injector test fixtures. IC Role / Device Role / Timing Role: High-current switch with programmable 155 ms blanking window and 25 A trip threshold to handle solenoid hold-and-pull current transitions. Use Value: Integrated open-load detection confirms coil integrity before engagement; self-recovery avoids system lockup during intermittent faults. |
| LED Lighting Management | Body Control Module Power Distribution |
|
Use Scenario: Switching high-brightness LED arrays in exterior lighting modules with thermal derating. IC Role / Device Role / Timing Role: Constant-current-capable high-side driver using CSNS feedback and SPI-adjusted slew rates to limit EMI during dimming transitions. Use Value: 4.0 mΩ RDS(on) minimizes power loss at 10 A; overtemperature shutdown at 175 °C prevents LED thermal runaway. |
Use Scenario: Replacing fuses and relays in centralized power distribution units for door locks, mirrors, and windows. IC Role / Device Role / Timing Role: Dual protected switch with FSI-configured fail-safe state (e.g., HS0 ON during watchdog timeout) ensuring critical functions remain active. Use Value: 0.3 J clamp energy handles inductive kickback from multiple simultaneous loads; SPI diagnostics report individual channel faults to BCM microcontroller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33984CHFK | Higher 0.5 J output clamp energy; identical pinout, SPI register map, and RDS(on); same temperature range (-40 to 125 °C) | Better suited for higher-inductance loads (e.g., heavy-duty starter solenoids) where energy dissipation during turn-off is critical | Select CHFK when load inductance exceeds 16 mH or VPWR > 13 V during switching transients |
| TPS4H160-Q1 | Single-channel, 160 mΩ RDS(on), no CSNS current sense output; supports 40 V VPWR but lacks programmable blanking or slew rate | Targeted at lower-current (≤2.5 A), cost-sensitive body electronics where diagnostic depth is secondary to basic protection | Choose TPS4H160-Q1 only for single-output, non-diagnostic applications with <5 A steady-state current and no need for current monitoring |
Compared with MC33984CHFK and TPS4H160-Q1, the MC33984EHFK offers optimal balance of dual-channel capability, 0.3 J clamp energy for mid-range inductive loads, and full SPI configurability - making it the preferred choice for automotive power distribution requiring diagnostics, flexibility, and proven field reliability.
Availability
MC33984EHFK is available at Aetrix Electronics and suitable for automotive body control modules, HVAC actuators, and lighting systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC33984EHFK 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 ICs and functional safety compliance.
The MC33984EHFK belongs to NXP's S32K-adjacent high-side switch portfolio, engineered specifically for ASIL-B-compliant automotive power distribution - emphasizing robustness, diagnostic coverage, and seamless integration with automotive microcontrollers.
FAQ
What is the maximum continuous output current rating for MC33984EHFK?
The MC33984EHFK supports 30 A continuous output current per channel (HS0/HS1) as long as the junction temperature remains below 150 °C. Actual achievable current depends on PCB copper area, ambient temperature, and airflow - thermal design must use the specified RθJA = 30 °C/W and RθJC < 1.0 °C/W values from the datasheet to avoid exceeding TJ limits. The MC33984EHFK datasheet specifies 30 A under steady-state conditions with proper heatsinking.
How does the CSNS pin function in MC33984EHFK, and what is its accuracy?
The CSNS pin outputs a current proportional to the selected high-side output (HS0 or HS1) with two programmable ratios: 1/19900 or 1/39600. When fed into a ground-referenced resistor, this generates a voltage for MCU ADC sampling. Accuracy varies with output current - e.g., ±13% at 15 A for CSR0 and ±18% at 15 A for CSR1. The MC33984EHFK datasheet provides full CSR accuracy tables across 5–25 A. CSNS can be tri-stated via SPI to reduce system power during idle.
Can MC33984EHFK operate without an external microcontroller?
Yes - the MC33984EHFK supports standalone operation via its parallel inputs (IN0 and IN1), which accept CMOS-level signals for direct ON/OFF or PWM control of HS0/HS1 without SPI involvement. The FSI pin configures fail-safe behavior (e.g., outputs OFF after watchdog timeout), and FS provides a simple fault flag. However, full diagnostics, current monitoring, and parameter tuning require SPI communication. The MC33984EHFK is designed for both autonomous and MCU-coordinated use cases.
What is the purpose of the FSI pin on MC33984EHFK, and how is it configured?
The FSI (Fail-Safe Input) pin determines the state of HS0 and HS1 after a watchdog timeout occurs. A resistor between FSI and GND selects one of three modes: all outputs OFF, all outputs ON, or HS0 only ON. Connecting FSI directly to GND disables the watchdog and fail-safe features entirely. The MC33984EHFK datasheet specifies exact resistance ranges (e.g., 0–1 kΩ for OFF state) and includes internal pull-up current to ensure defined behavior during floating conditions.
Does MC33984EHFK support daisy-chained SPI communication?
Yes - the MC33984EHFK supports daisy-chained SPI topology. The SI pin accepts serial data from the MCU or the SO pin of the preceding device; the SO pin drives the SI pin of the next device in the chain. All devices share common SCLK and CS lines, with individual CS selection enabling targeted register access. This reduces MCU GPIO count and simplifies routing in multi-switch systems. The MC33984EHFK maintains full register compatibility and timing margins in daisy-chain mode per Rev. 17.0 specifications.
MC33984EHFK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 16-PowerQFN
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Active
- Switch Type:
- General Purpose
- Number of Outputs:
- 2
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- High Side
- Output Type:
- N-Channel
- Interface:
- SPI
- Voltage - Load:
- 6V ~ 27V
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Current - Output (Max):
- 30A
- Rds On (Typ):
- 4mOhm (Max)
- Input Type:
- Non-Inverting
- Features:
- Slew Rate Controlled, Watchdog Timer
- Fault Protection:
- Current Limiting (Adjustable), Open Load Detect, Over Temperature, Over Voltage, Short Circuit, UVLO
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HQFN (12x12)
MC33984EHFK FAQ
1.How can I place an order for MC33984EHFK through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33984EHFK 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 MC33984EHFK reliable?
The price and inventory of MC33984EHFK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33984EHFK is usually 5 days.
3.What payment methods are accepted for MC33984EHFK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33984EHFK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33984EHFK?
MC33984EHFK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33984EHFK 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 MC33984EHFK?
For technical support, including MC33984EHFK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33984EHFK requirements.
6.How does Aetrix verify that MC33984EHFK is sourced from the original manufacturer or authorized distributors?
All MC33984EHFK 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 MC33984EHFK meets industry standards.
7.What is the process for return or replacement of MC33984EHFK?
All MC33984EHFK units undergo pre-shipment inspection (PSI). If there is an issue with MC33984EHFK, 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 MC33984EHFK part is unused and in its original packaging.
Return procedure for MC33984EHFK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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