MC33287DWR2 - Dual Low-Side Switch w/ Contact Monitor | NXP
N.º de pieza: MC33287DWR2 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.12 | $4,12 |
| 10 | $3.71 | $37,10 |
| 100 | $3.3 | $330,00 |
| 500 | $2.96 | $1.480,00 |
| 1.000 | $2.64 | $2.640,00 |
MC33287DWR2 Descripción general
A Power Management IC (PMIC) of the contact-monitor/driver class, the MC33287 sits hierarchically between a microcontroller and physical switch/load interfaces. As a low-side switch it pulls load negative terminals toward ground; as a contact monitor it digitizes up to eight mechanical or electronic switch contacts with debounce and current limiting, replacing discrete resistors, diodes and comparators that previously consumed 100 mm² of PCB area. The device targets body-electronics ECUs, junction boxes, and industrial control panels where multiple wet/dry contacts must be sensed in a compact footprint.
Key features include an on-state resistance of 1.4 Ohm per low-side driver, integrated flyback/clamping protection for inductive loads, programmable contact wetting current, switch-to-battery and switch-to-ground sensing in one IC, and built-in fault reporting through a status output. The 20-SOIC wide-body (7.5 mm) package provides adequate pin pitch for high-current PCB traces and standard hand-soldering rework.
Architecturally the MC33287 combines an analog sense front-end, an 8-channel multiplexer, a microcontroller-compatible logic interface, and two protected DMOS low-side output stages. Each low-side driver integrates over-current, over-voltage, and thermal shutdown; the sense channels use a bandgap-referenced comparator for stable operation across -40C to +125C.
Typical applications include automotive body controllers, junction boxes, HVAC mode-monitor panels, and industrial switch-input PLCs. The wide input range and integrated protection make it a single-chip replacement for dozens of discrete components.
A design trade-off exists: the on-resistance of 1.4 Ohm causes ~0.7 W dissipation at 500 mA per channel, so thermal relief on the SOIC pad is required for continuous high-current operation.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas directas para MC33287DWR2 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MC33287DW
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC33287DWR2G
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC33287DWF
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MC33887PEFR2
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TLE7240SL
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC33287DWR2 Valores máximos y características eléctricas
| Función | Contact Monitor + Dual Low-Side Protected Driver |
| Supply Voltage (V) | 7 V to 18 V |
| On-State Resistance (Ron) | 1.4 Ohm |
| Configuración de salida | Low Side |
| Number of Drivers | 2 |
| Number of Sense Channels | 8 (switch-to-battery or switch-to-ground) |
| Interfaz | Parallel / MCU-compatible logic |
| Encapsulado / Carcasa | 20-SOIC (0.295", 7.50 mm Width) |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -40C to +125C |
| Protection Features | Over-current, over-voltage, thermal shutdown, inductive load clamping |
| Load Type | Inductive or capacitive |
Configuración de pines de MC33287DWR2
| Pin 1 | VBAT — Battery supply input |
| Pin 2 | OUT1 — Low-side driver output 1 |
| Pin 3 | OUT2 — Low-side driver output 2 |
| Pin 4 | GND — Ground |
| Pin 5 | SNS0 — Switch sense input 0 |
| Pin 6 | SNS1 — Switch sense input 1 |
| Pin 7 | SNS2 — Switch sense input 2 |
| Pin 8 | SNS3 — Switch sense input 3 |
| Pin 9 | SNS4 — Switch sense input 4 |
| Pin 10 | SNS5 — Switch sense input 5 |
| Pin 11 | SNS6 — Switch sense input 6 |
| Pin 12 | SNS7 — Switch sense input 7 |
| Pin 13 | WET — Wetting current source |
| Pin 14 | SEL — Channel select / MUX |
| Pin 15 | CLK — Clock input |
| Pin 16 | DATA — Serial data output |
| Pin 17 | ST — Status / fault flag |
| Pin 18 | CS — Chip select |
| Pin 19 | VDD — Logic supply |
| Pin 20 | EN — Global enable |
Aplicaciones típicas
MC33287DWR2 es adecuado para 6 aplicacións: Automotive Body Control Module, Automotive Junction Box, Industrial PLC Switch-Input Card, HVAC Mode Selector / Climate Panel, Agricultural / Off-Road Vehicle Switch Console, Appliance Control Board.
Automotive Body Control Module
The MC33287DWR2 fits automotive body controllers thanks to its 7-18 V supply (native 12 V battery rail), -40C to +125C operating range, and integrated 8-channel switch monitoring. In a BCM it sits between the door/hood/trunk microswitches and the microcontroller, replacing 8 pull-ups, 8 protection diodes, and a comparator array. The two protected low-side drivers directly drive courtesy lamps or seat-heater relays. The 1.4 Ohm Ron keeps lamp-driver dissipation below 1 W per channel at typical 700 mA bulb loads, eliminating external MOSFETs. Unlike discrete designs, the integrated contact-monitor debounce and wetting-current source cut firmware overhead. According to the NXP datasheet, the device's ESD ratings on the sense pins are tailored to automotive load-dump and jump-start transients, making it robust for under-hood and cabin applications.
Recomendado
Automotive Junction Box
For automotive junction boxes the MC33287DWR2 provides the central sense-and-drive hub required by smart PDMs. Its 8 sense inputs read fuse status and load-current monitor outputs while the two low-side drivers control relay coils. The 20-SOIC wide-body package simplifies high-current PCB routing with 1.27 mm pin pitch accommodating 2 oz copper traces. Compared to a discrete design with 16 components the MC33287DWR2 collapses the BOM to one IC plus bypass caps. NXP datasheet specifies over-current and thermal protection per channel, critical for unattended junction-box operation where field-service replacement would be costly. The 1.4 Ohm on-resistance gives predictable voltage drop at known junction-box currents, simplifying fuse coordination calculations.
Recomendado
Industrial PLC Switch-Input Card
In industrial PLC discrete-input modules, the MC33287DWR2 replaces the per-channel optocoupler, rectifier, resistor and comparator chain with a single IC. Eight switch-to-battery or switch-to-ground inputs cover both PNP and NPN sensor wiring without board rework. The 7-18 V supply rails down to 24 V industrial common-mode through a simple external regulator or is powered directly from 12 V systems. Per the NXP datasheet, the integrated wetting current source provides the bias needed for mechanical switch contacts in dusty or oxidizing environments - critical for factory automation where contact reliability drives downtime. Two driver channels can also sink indicator LEDs or alarm relays, providing complete per-card I/O in 100 mm².
Recomendado
HVAC Mode Selector / Climate Panel
The MC33287DWR2 reads rotary-mode switches and pushbuttons on HVAC control panels while driving the indicator LEDs or small damper motors. Its -40C to +125C operating range covers under-dash thermal stress. The 1.4 Ohm Ron drivers can directly sink LED arrays at 20-50 mA per channel without external transistors. According to NXP, the device supports switch-to-ground inputs natively (rotary wipers typically short to ground through resistor ladders), eliminating level translation. The 20-SOIC wide-body footprint fits standard automotive climate-panel PCB tooling. Compared to discrete designs the part reduces wire-harness complexity by combining sense and drive functions, simplifying the climate-panel BOM.
Recomendado
Agricultural / Off-Road Vehicle Switch Console
For tractors, forklifts and construction equipment, the MC33287DWR2 consolidates switch-input sensing in a single rugged SOIC. Eight sense channels interface with sealed cabin switches exposed to moisture, and the integrated wetting current prevents contact oxidation-induced false reads. The 7-18 V supply directly handles 12 V and 24 V vehicle buses. Two low-side drivers control relay coils or warning lamps. NXP datasheet specifies the inductive-load clamping required for off-road solenoid and motor loads. Compared to discrete optoisolator designs, the MC33287DWR2 lowers cost per channel and fits the wider-temperature environment of agricultural machinery.
Recomendado
Appliance Control Board
In white-goods appliance control boards (washing machines, dishwashers, ovens), the MC33287DWR2 monitors door-latch switches, rotary program selectors and button matrices. Its 8 sense channels cover all typical appliance user-interface elements, while two low-side drivers switch indicator LEDs or small solenoid valves. The 1.4 Ohm Ron handles valve coils up to 500 mA with proper thermal design. According to the NXP datasheet, the integrated over-temperature and over-current protection supports unattended appliance operation, reducing warranty returns from thermal events. The wide-body SOIC supports hand-rework during prototyping - a major benefit for low-volume appliance OEM designs.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC33287DWR2 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC33287DW | MC33287DWR2G | MC33287DWF | MC33887PEFR2 | TLE7240SL |
|---|---|---|---|---|---|---|
| Package | 20-SOIC wide-body (7.5 mm) | 20-SOIC wide-body - same | 20-SOIC wide-body - same | 20-SOIC wide-body - same | 20-SOIC equivalent - same | 20-SOIC equivalent - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Infineon |
| Function | 8-channel contact monitor + dual low-side driver | Same | Same | Same | Dual low-side driver only (no contact monitor) | Octal low-side driver (Infineon) |
| Supply Voltage (V) | 7 to 18 | 7 to 18 | 7 to 18 | 7 to 18 | 5 to 28 | 5 to 28 |
| On-State Resistance (Ohm) | 1.4 | 1.4 | 1.4 | 1.4 | 0.7 | 0.5 |
| Number of Sense Inputs | 8 | 8 | 8 | 8 | 0 | 0 |
| Number of Low-Side Drivers | 2 | 2 | 2 | 2 | 2 | 8 |
| Inductive Load Protection | Integrated clamping | Integrated clamping | Integrated clamping | Integrated clamping | Integrated clamping | Integrated clamping |
| Operating Temperature (C) | -40 to +125 | -40 to +125 | -40 to +125 | -40 to +125 (F grade) | -40 to +150 | -40 to +150 |
Diferenciadores clave
- Integrated 8-channel contact monitor eliminates external comparators and pull-ups (frente a MC33887PEFR2)
- Switch-to-battery or switch-to-ground sensing without board rework (frente a Discrete optocoupler input cards)
- 1.4 Ohm Ron low-side drivers with integrated inductive clamping (frente a TLE7240SL (Infineon))
Notas de diseño
Estimated: At 500 mA per low-side output and 1.4 Ohm Ron, each channel dissipates P = I^2 * R = 0.25 * 1.4 = 0.35 W. With both channels active (0.7 W total) on the 20-SOIC wide-body (theta_JA approximately 70 C/W on a 1 oz 4-layer board), junction temperature rise is 49 C above ambient. For sustained operation near 125 C ambient, copper-pour heatsinking under the SOIC pad is required to keep Tj below the 150 C shutdown threshold.
Per the NXP MC33287 datasheet, place the VDD/VBAT bypass capacitors (typically 100 nF ceramic in parallel with 10 uF tantalum) within 5 mm of the supply pins. Route the OUT1/OUT2 traces with 2 oz copper or wider to limit DC drop - at 1 A load the drop across 1.4 Ohm plus trace resistance can exceed 10% of VDD if traces are thin.
Do not exceed 18 V on VBAT without external TVS clamping - load-dump transients on automotive 12 V buses can reach 35 V per ISO 7637-2. Apply an external 18 V TVS (e.g., SMBJ16A) close to the VBAT pin. Also confirm wetting-current programming resistor values: too low a value will not reliably close oxidized mechanical contacts, while too high a value causes parasitic drain in always-on circuits.
Información de cumplimiento
AEC-Q100 qualified per NXP automotive grade designation. RoHS/REACH/lead-free status not specified in verified web data - confirm on the NXP product page before production.
