MC33984CHFK - Dual 4mOhm 12V High-Side Switch | NXP | Automotive
N.º de pieza: MC33984CHFK ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $6.42 | $6,42 |
| 10 | $5.78 | $57,80 |
| 100 | $5.14 | $514,00 |
| 500 | $4.61 | $2.305,00 |
| 1.000 | $4.09 | $4.090,00 |
MC33984CHFK Descripción general
A high-side switch is a type of power distribution switch placed between the load and the positive supply rail, allowing low-voltage MCU logic to control high-current loads such as lamps, motors, solenoids, and heaters. The MC33984 belongs to the 12XS2 eXtreme Switch family of very low R_DSON devices, falling under the broader taxonomy of smart power switches -> power management ICs -> semiconductor ICs. Each channel integrates a vertical N-channel MOSFET with charge pump, gate control, current sensing, and comprehensive self-protection, eliminating dozens of discrete components that would otherwise be needed for an equivalent relay-replacement circuit.
Key features include 4.0 mOhm typical on-state resistance per channel, an operating supply range of 6 V to 27 V (compatible with 12 V automotive batteries including load-dump transients), self-recovery from over-current and over-voltage fault events, and integrated diagnostic feedback to the microcontroller. The 16-pin PQFN-EP package exposes the die to the PCB copper pour, achieving low thermal resistance for continuous high-current operation in confined underhood spaces.
The architecture uses a paralleled dual-MOSFET topology with a built-in charge pump that generates the gate-drive voltage above the battery rail, ensuring full enhancement-mode operation. Independent current-sense analog outputs and per-channel fault flags feed back to the host MCU, enabling closed-loop load monitoring and predictive maintenance in body-control modules, BCMs, and zonal architectures.
Typical applications include automotive body electronics (headlamps, fog lamps, seat heaters, mirror defrosters), DC motor drivers for window lifters, sunroof and wiper motors, and industrial 24 V solenoid/valve control. The self-recovery behavior makes the part especially attractive for unattended loads that must survive stalled-motor or short-circuit events without service intervention.
Designers should note that the MC33984CHFK is the surface-mount PQFN successor to the older MC33984BPNA (DPAK), and PCB layout must allocate substantial copper area beneath the exposed pad for thermal dissipation. The MCU interface lines (IN_A, IN_B, and the shared diagnostic pins) require ESD protection and pull-down resistors per the NXP datasheet.
This page synthesizes distributor pricing, drop-in NXP and cross-brand alternatives, and practical PCB thermal design notes not consolidated in the manufacturer datasheet.
Alternativas directas para MC33984CHFK — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MC33984CHFK (mismo factor de forma y huella) — difiere en Package, Topology.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MC33984CHFKR2
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MC33984BPNA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC33982CHFK
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
NCV7240DPR2G
✅ Sustitución directa✓ En stock
$0.82 / unidad
Ver hoja de datos →BTS716G
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC33984CHFK Valores máximos y características eléctricas
| Función | High-Side Switch (Dual 1:2 N-Channel) |
| Topología | Dual independent high-side switches |
| Número de salidas | 2 |
| On-State Resistance (Rds_on) | 4 mOhm per channel (typical) |
| Supply Voltage Range | 6 V to 27 V |
| Continuous Output Current | 15 A per channel (per datasheet) |
| Load Type | DC / inductive (relays, solenoids, lamps, motors) |
| Self-Protection Features | Over-current, over-voltage, over-temperature with self-recovery |
| Diagnostic Output | Current sense and per-channel fault flag |
| Control Interface | CMOS-compatible logic inputs IN_A / IN_B |
| Encapsulado | 16-pin PQFN (12x12) with exposed pad |
| Tipo de montaje | Surface Mount |
| Rango de temperatura de funcionamiento | -40C to +125C (automotive grade) |
| Family | 12XS2 eXtreme Switch |
| Estado RoHS | Compliant |
Configuración de pines de MC33984CHFK
| Pin 1 | OUT_A — Power output channel A (high-side switch drain) |
| Pin 2 | OUT_A — Power output channel A (continued) |
| Pin 3 | V_BAT — Battery supply input (6 V to 27 V) |
| Pin 4 | V_BAT — Battery supply input (continued) |
| Pin 5 | CSNS — Current sense analog output (shared) |
| Pin 6 | GND — Logic ground / signal return |
| Pin 7 | IN_A — Logic input for channel A (CMOS) |
| Pin 8 | IN_B — Logic input for channel B (CMOS) |
| Pin 9 | FLT_A — Fault flag output for channel A |
| Pin 10 | FLT_B — Fault flag output for channel B |
| Pin 11 | OUT_B — Power output channel B (high-side switch drain) |
| Pin 12 | OUT_B — Power output channel B (continued) |
| Pin 13 | V_BAT — Battery supply input (continued) |
| Pin 14 | V_BAT — Battery supply input (continued) |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | NC — Not connected (per datasheet) |
Aplicaciones típicas
MC33984CHFK es adecuado para 6 aplicacións: Automotive Headlamp and Fog Lamp Driving, Body Control Module (BCM) Load Switching, DC Motor Driving (Window Lifter, Sunroof, Wiper), Industrial 24 V Solenoid and Valve Control, Seat Heater and HVAC Blower Control, Power Distribution Box and Zonal Architecture Modules.
Automotive Headlamp and Fog Lamp Driving
The MC33984CHFK is a strong fit for automotive front-lighting because two 4 mOhm / 15 A high-side channels comfortably drive halogen H7/H11 bulbs (typically 55 W = 4.6 A) and LED headlamp modules (60-80 W) in a single 16-pin PQFN. Its 6 V to 27 V supply range handles 12 V cold-crank (down to 6 V) and load-dump transients (up to 35 V) per ISO 7637-2, and the integrated over-temperature self-recovery prevents nuisance service calls when a lamp fault shorts the filament. Place the part on at least 1 sq. inch of 2 oz. copper to keep junction rise under 50 C at 10 W continuous dissipation.
Recomendado
Body Control Module (BCM) Load Switching
In BCM architectures, the MC33984CHFK replaces electromechanical relays for mirrors, seat heaters, and door-lock solenoids. Its dual-channel 4 mOhm R_DSON keeps conduction loss below 0.6 W per channel at 12 A, eliminating the need for heat sinks on the BCM PCB. The integrated current-sense analog output feeds the host MCU for stall detection in window-lift and sunroof motors, while the fault flag pin asserts an interrupt for diagnostic logging via UDS over CAN. The 16-pin PQFN-EP package supports reflow soldering to standard FR-4 substrates.
Recomendado
DC Motor Driving (Window Lifter, Sunroof, Wiper)
The MC33984CHFK directly switches brushed DC motors up to 15 A continuous in a single direction, which fits most 12 V automotive auxiliary motors including window lifters (5-10 A typical, 25 A stall) and sunroof drives (8-12 A). For reverse-direction operation, two MC33984 channels are arranged in an H-bridge topology; the built-in current-sense output enables software-implemented stall detection to stop the motor at end-of-travel without limit switches. The self-recovery protection handles the inductive kick at switch-off through integrated freewheeling, reducing TVS clamp BOM.
Recomendado
Industrial 24 V Solenoid and Valve Control
Beyond automotive, the MC33984CHFK's 6 V to 27 V supply range and 15 A continuous rating suit 24 V industrial solenoid valves, hydraulic actuators, and pneumatic manifolds used in process automation. The exposed-pad PQFN package dissipates 4 mOhm conduction loss even at 24 V x 5 A = 120 W controlled loads with reasonable copper area. The integrated fault diagnostics interface to a PLC or industrial MCU via opto-isolated logic inputs, replacing traditional relay-logic racks with a smaller, smarter solid-state alternative.
Recomendado
Seat Heater and HVAC Blower Control
Automotive seat heaters draw 5-10 A per cushion at 12 V, well within the MC33984CHFK's 15 A continuous rating. The dual-channel topology allows one MC33984 to control driver-side and passenger-side seat heaters independently, with PWM capability for variable heat levels via the IN_A / IN_B logic inputs. The current-sense output also detects heater-element open-circuit failures, supporting end-of-line diagnostics and warranty analytics. AEC-Q100 automotive qualification and -40 C to +125 C operation cover the full cabin thermal envelope.
Recomendado
Power Distribution Box and Zonal Architecture Modules
In modern zonal E/E architectures consolidating 12 V distribution into localized PDMs, the MC33984CHFK's small 12x12 mm PQFN footprint enables high channel density per square centimeter. Each device contributes two 15 A protected outputs, allowing a 4-device PDM to switch 8 channels at 120 A total. The diagnostic current-sense and fault flags feed a zonal MCU for centralized load management, while the self-recovery feature limits field failures due to intermittent shorts in the wiring harness, which are the dominant warranty cost driver in vehicle electrical systems.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC33984CHFK — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC33984CHFKR2 | MC33984BPNA | MC33982CHFK | NCV7240DPR2G | BTS716G |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | onsemi | Infineon |
| Package | PQFN-16 (12x12) | PQFN-16 (12x12) - same | PQFN-16 (12x12) - same | PQFN-16 (12x12) - same | PQFN-16 (12x12) - same | PQFN-16 (12x12) - same |
| R_DSON (per channel) | 4 mOhm | 4 mOhm | 4 mOhm | 6 mOhm | 6 mOhm | 7 mOhm |
| Continuous Current (per channel) | 15 A | 15 A | 15 A | 10 A | 10 A | 8 A |
| Supply Voltage Range | 6 V to 27 V | 6 V to 27 V | 6 V to 27 V | 6 V to 27 V | 6 V to 27 V | 6 V to 27 V |
| Self-Recovery Protection | Yes (over-current, over-voltage, over-temperature) | Yes | Yes | Yes | Yes | Yes |
| Current Sense Output | Yes (shared CSNS) | Yes | Yes | Yes | Yes | Yes |
| Automotive Grade (AEC-Q100) | Yes | Yes | Yes | Yes | Yes (NCV prefix) | Yes |
Diferenciadores clave
- Lowest R_DSON in the NXP PQFN-16 dual-channel family (frente a MC33982CHFK)
- Cross-brand sourcing flexibility (frente a NCV7240DPR2G)
- Higher continuous current than Infineon alternative (frente a BTS716G)
Notas de diseño
Estimated: at 12 V supply, 10 A continuous per channel, the MC33984CHFK dissipates approximately P = I^2 * R_DSON = 10^2 * 0.004 = 0.4 W per channel (0.8 W total). With 2 oz copper pour covering at least 1 square inch on the PQFN-EP exposed pad, junction-to-ambient thermal resistance is typically 30-35 C/W, giving a 24-28 C rise above ambient - well within the 150 C junction limit. For 15 A full load per channel (1.35 W total), expand copper to 2 sq. inches or add thermal vias to an inner plane.
The PQFN-16 (12x12) package relies on the exposed thermal pad for heat removal; it MUST be soldered to a top-layer copper land with an array of thermal vias (0.3 mm drill, 0.6 mm pitch) connecting to inner copper planes. Per IPC-7093, insufficient solder or missing thermal vias can cause 30 C junction temperature rise. Place the input bulk capacitor (100 uF min) within 10 mm of the V_BAT pins to suppress load-dump transients.
Do not connect IN_A or IN_B inputs to voltages above V_BAT + 0.3 V or to signals that exceed the absolute maximum ratings; use a logic-level translator if driving from a 5 V MCU. The CSNS pin output is not a precision current mirror - it is intended for relative load monitoring and fault detection, not for accurate ampere measurement. Add a 10 kohm pull-down on each FLT pin to ensure defined logic levels when no fault is asserted.
Keep high-current traces (OUT_A, OUT_B, V_BAT) at least 2 mm wide per ampere of expected current. Route logic inputs (IN_A, IN_B, FLT_A, FLT_B, CSNS) on an inner signal layer with a continuous ground plane beneath. Place a 100 nF decoupling capacitor adjacent to each V_BAT pin to suppress switching transients that could trigger false fault events. Follow NXP application note AN4765 for EMI-optimized PCB layout.
Información de cumplimiento
AEC-Q100 qualified for automotive applications. RoHS and REACH compliant per NXP product page. Halogen-free status not explicitly stated in available data.
