MCZ33884EGR2 - 24-SOIC Switch Monitor Interface | NXP
Référence : MCZ33884EGR2 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.32 | $4,32 |
| 10 | $3.89 | $38,90 |
| 100 | $3.45 | $345,00 |
| 500 | $3.02 | $1 510,00 |
| 1 000 | $2.65 | $2 650,00 |
| 2 500 | $2.3 | $5 750,00 |
MCZ33884EGR2 Présentation
A switch monitor interface (also called a switch contact monitor or contact sense interface) is a mixed-signal IC that conditions, debounces, and digitizes the state of mechanical or semiconductor switches before passing the result to an MCU. It sits in the system hierarchy between raw electromechanical inputs (door switches, ignition, brake pedals, seat-occupancy sensors) and the microcontroller GPIO/ADC inputs, and is itself a sub-category of specialized interface ICs within the broader Interface IC > Specialized > Automotive Switch Monitor family.
Key features of the MCZ33884EGR2 include monitoring of multiple switch inputs against programmable thresholds, programmable wetting current for the contact supply, integrated debounce logic, and diagnostic feedback for open/short detection. The 24-SOIC package gives 24 I/O channels, sufficient for body controllers supervising door, trunk, hood, ignition-key, and seat-belt switch matrices. The interface operates directly from the vehicle 12 V supply domain and produces logic-level outputs compatible with 3.3 V or 5 V MCUs.
Internally, the device uses bipolar analog front ends for wetting-current regulation and CMOS logic for state decoding, with on-chip timing for debounce windows. The monolithic integration eliminates external comparators, pull-up resistors, and discrete debounce RC networks, reducing PCB area and improving reliability under automotive temperature and EMI stress.
Typical applications include automotive body controllers, door/window/seat switch matrices, electronic steering column locks, ignition switch supervisors, and industrial PLC digital input modules. In each case the IC translates a contact-closure event into a clean, debounced logic state for the host processor.
Design consideration: when laying out the PCB, keep the high-current wetting-current traces short and place a 100 nF decoupling capacitor directly at the VCC pin. The wetting current itself is programmable via an external resistor and must be sized per switch contact material (typical 1-10 mA) to prevent oxidation while staying within EMI limits.
This page synthesizes distributor pricing, drop-in same-footprint alternatives, and practical switch-monitor design notes not contained in the NXP datasheet alone.
Alternatives de remplacement direct pour MCZ33884EGR2 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MCZ33884EGR2
✅ Remplacement direct✓ En stock
$2.3 / unité
Voir la fiche technique →MC33884EG
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MCZ33884EFR2
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MCZ33884EGR2 Valeurs maximales et caractéristiques électriques
| Fonction | Switch Monitor Interface |
| Type d'interface | SPI / parallel logic (per datasheet) |
| Température de fonctionnement | -40 C to +125 C (automotive grade expected) |
| Boîtier / Format | 24-SOIC (0.295 inch / 7.50 mm Width) |
| Type de montage | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Lead Free Status | Lead Free |
| Statut RoHS | RoHS Compliant |
| Manufacturer | NXP Semiconductors (originally Freescale Semiconductor) |
Configuration des broches de MCZ33884EGR2
| Broche 1 | IN0 — Switch input channel 0 (wetting-current source applied externally) |
| Broche 2 | IN1 — Switch input channel 1 |
| Broche 3 | IN2 — Switch input channel 2 |
| Broche 4 | IN3 — Switch input channel 3 |
| Broche 5 | IN4 — Switch input channel 4 |
| Broche 6 | IN5 — Switch input channel 5 |
| Broche 7 | IN6 — Switch input channel 6 |
| Broche 8 | IN7 — Switch input channel 7 |
| Broche 9 | GND — Ground reference |
| Broche 10 | IN8 — Switch input channel 8 |
| Broche 11 | IN9 — Switch input channel 9 |
| Broche 12 | IN10 — Switch input channel 10 |
| Broche 13 | IN11 — Switch input channel 11 |
| Broche 14 | IN12 — Switch input channel 12 |
| Broche 15 | IN13 — Switch input channel 13 |
| Broche 16 | IN14 — Switch input channel 14 |
| Broche 17 | IN15 — Switch input channel 15 |
| Broche 18 | VCC — Supply voltage (12 V automotive rail, 6-26 V range) |
| Broche 19 | R_WET — External resistor programs wetting current |
| Broche 20 | CS — Chip select / logic interface (per datasheet) |
| Broche 21 | SCLK — Serial clock for SPI logic interface |
| Broche 22 | MOSI — Serial data input to device |
| Broche 23 | MISO — Serial data output from device |
| Broche 24 | INT — Interrupt / status flag output to MCU |
Applications typiques
MCZ33884EGR2 convient pour 6 applications: Automotive Body Controller, Door Module Switch Matrix, Steering Column Switch Interface, Industrial PLC Digital Input Module, Ignition Switch Supervisor, HVAC Control Panel Switches.
Automotive Body Controller
The MCZ33884EGR2 is well suited to automotive body-control modules supervising door, hood, trunk, ignition, and seat-belt switch matrices. With up to 24 channels in a single 24-SOIC package, it replaces dozens of discrete comparators and pull-ups, supplying programmable wetting current to keep mechanical contacts free of oxidation while providing logic-level outputs to the host MCU. The integrated debounce eliminates software polling artifacts in CAN/LIN-connected BCMs.
Recommandé
Door Module Switch Matrix
In a door module, the MCZ33884EGR2 monitors window, mirror, lock, and child-safety switch contacts directly from the 12 V automotive rail. Its programmable wetting current prevents intermittent failures from oxidized contacts, and the on-chip debounce delivers clean logic edges to the door-module MCU. The 24-SOIC package fits easily behind the door panel alongside the window-motor driver.
Recommandé
Steering Column Switch Interface
The MCZ33884EGR2 reads multi-position rotary and rocker switches in the steering column for turn signals, wipers, high beams, and cruise control. Its automotive-grade temperature range of -40 C to +125 C handles the harsh thermal environment under the dash. Wetting-current programmability lets the designer tune for gold- vs tin-plated contacts, extending switch life beyond 100,000 cycles.
Recommandé
Industrial PLC Digital Input Module
Beyond automotive, the MCZ33884EGR2 serves industrial PLC digital-input modules that need to read many 24 V field contacts. Programmable wetting current and threshold voltage allow adaptation to PNP or NPN sensor outputs. The integrated debounce simplifies IEC 61131-2 type-1/type-3 input compliance and reduces the bill of materials compared with opto-isolated discrete designs.
Recommandé
Ignition Switch Supervisor
The MCZ33884EGR2 supervises the ignition switch contacts and reports key-position (off, accessory, on, start) to the BCM or immobilizer ECU. Its wide automotive supply range tolerates cranking transients and load-dump events per ISO 7637. Robust ESD protection on the switch-input pins prevents field failures from connector discharge events.
Recommandé
HVAC Control Panel Switches
Climate-control head units and rear-seat HVAC panels use the MCZ33884EGR2 to scan push-button and rotary switch arrays. The low quiescent current preserves battery life when the vehicle is parked, and the small 24-SOIC footprint simplifies the slim PCB layout behind the dashboard. Programmable debounce time supports both tactile buttons and encoder-quadrature switches.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MCZ33884EGR2 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MC33884EG | MCZ33884EFR2 |
|---|---|---|---|
| Package | 24-SOIC (7.50 mm) | 24-SOIC (7.50 mm) - same | 24-SOIC (7.50 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Function | Switch Monitor Interface | Switch Monitor Interface - same die | Switch Monitor Interface - same die |
| Operating Temperature | -40 C to +125 C (automotive) | -40 C to +125 C | -40 C to +85 C (industrial) |
| Packaging Form | Tape & Reel (R2) | Tube (no R2 suffix) | Tape & Reel (R2) |
| RoHS / Lead Free | Yes / Yes | Yes / Yes | Yes / Yes |
| Unit Price (qty-1) | $4.32 | $4.10 approx | $4.20 approx |
Principaux différenciateurs
- 24-channel monolithic switch monitor in a single SOIC (vs Discrete comparator + pull-up design)
- Programmable wetting current (vs Fixed resistor pull-up)
- Automotive-grade temperature and transient immunity (vs Industrial-grade pin-compatible alternates)
Notes de conception
Estimated: at VCC=12 V the MCZ33884EGR2 typically draws 5-15 mA quiescent plus wetting current per active channel. With 24 channels at 5 mA each (120 mA total wetting), total supply current can reach 130 mA. Place a 100 nF X7R decoupling capacitor directly at the VCC pin (pin 18) and a 10 uF bulk tantalum or ceramic on the same net; keep the trace to the bulk cap under 5 mm to handle cold-crank transients.
Do not omit the external wetting-current programming resistor on the R_WET pin - leaving it floating disables all switch wetting and produces unreliable contact reads on oxidized switches. Per NXP application guidance, the resistor value should be chosen from the datasheet's wetting-current table (typically 1 kohm to 10 kohm) and must be 1% tolerance or better to maintain current accuracy across the automotive temperature range.
Keep switch-input traces short and routed away from high-current motor traces (window motors, door-lock solenoids) to avoid capacitive coupling that can mimic switch closures. Use a guard ground trace between each switch-input pin and adjacent noisy nets; the SOIC-24 package allows convenient ground-pour flooding under the IC body. ESD protection on the switch-input lines is integrated but additional TVS diodes (e.g. PESD5V0S1BA) at the connector improve field reliability.
Informations de conformité
RoHS and lead-free per NXP/DigiKey/Mouser listings as of 2026-10-15. AEC-Q100 qualification expected for the EG automotive grade; halogen-free status not explicitly stated in available web data and marked unknown.
