MCZ33781EK - DSI2 Master Transceiver, 32-SOIC-EP | NXP
料号： MCZ33781EK ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.18 | $6.18 |
| 10 | $5.55 | $55.50 |
| 100 | $4.94 | $494.00 |
| 500 | $4.45 | $2,225.00 |
| 1,000 | $3.96 | $3,960.00 |
MCZ33781EK 概述
What is a DSI bus transceiver? A DSI (Distributed Serial Interface) transceiver is a type of automotive communication interface IC that connects a microcontroller to remote slave nodes (e.g., switches, sensors, lamps) over a single-wire or two-wire differential bus. DSI sits within the broader IC hierarchy as follows: DSI transceiver -> automotive interface IC -> interface IC -> integrated circuit -> semiconductor. It enables low-cost, robust body-electronics networks where star or daisy-chain wiring reduces harness weight and cost compared to traditional point-to-point wiring.
Key features of the MCZ33781EK include support for DBUS2 master mode, integrated physical-layer transceiver functions, on-chip diagnostics, and a wide operating voltage range suited for 12V automotive battery rails. The exposed thermal pad (EP) of the 32-SOIC package provides a low theta_JA path for dissipating the moderate heat generated during full-duplex communication, supporting reliable operation in underhood and cabin environments.
Architecturally, the device integrates a high-side driver, low-side driver, voltage regulator, and protection circuitry on a single die, allowing it to act as both a bus master and a local power-supply source for downstream slave nodes. This integration reduces BOM count and PCB area versus discrete implementations. The device also supports a sleep/wake-up sequence for low quiescent-current standby, important for battery-aware vehicles.
Typical applications include automotive body control modules (BCM), HVAC control panels, lighting controllers (headlamp levelers, ambient lighting), seat and mirror modules, door-zone controllers, and steering-column switch interfaces. It is also used in industrial equipment that benefits from the same rugged serial bus approach.
When designing with this part, ensure the exposed pad is soldered to a sufficient copper pour (>=1 square inch) to keep junction temperature within safe limits under sustained high bus-traffic duty cycles. Also, follow NXP's recommended TVS diode and common-mode choke placement for EMI immunity in automotive environments.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the manufacturer datasheet, helping engineers select, source, and implement the MCZ33781EK efficiently.
直接替换替代料： MCZ33781EK ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MCZ33781EK （相同外形与封装尺寸） ——差异在于 Function, Package.
快速对比工具——选择替代料号进行并排对比：
MCZ33780EF
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MCZ33972AEW
✅ 直接替换✓ 有现货
$2.34 / 个
查看数据手册 →MCZ33781EK 规格参数
| 功能 | DSI2 (DBUS2) Master Transceiver |
| Operating Mode | Master, Standard |
| 工作温度 | -40C to +90C |
| 封装 | 32-SOIC-EP (WSOIC-32 with Exposed Pad) |
| 引脚数量 | 32 |
| 安装类型 | Surface Mount |
| 接口类型 | DBUS2 / DSI2 (automotive serial bus) |
| RoHS 状态 | Compliant |
| Wake/Sleep Capability | Yes (low-power standby supported) |
| Integrated Protections | Load dump, reverse battery, thermal shutdown, short-circuit |
| Number of Masters per Bus | 1 (master role) |
| Bus Topology | Differential 2-wire (DBUS2) |
| Recommended Applications | BCM, HVAC, lighting, door-zone, seat modules |
| 生命周期状态 | End of Life (per NXP PCN notice) |
MCZ33781EK 引脚配置
| 引脚 1 | VBAT — Battery supply input (12V automotive rail) |
| 引脚 2 | VCC — 5V regulated logic supply output |
| 引脚 3 | GND — Ground reference |
| 引脚 4 | DBUS_H — DBUS2 high-side differential line |
| 引脚 5 | DBUS_L — DBUS2 low-side differential line |
| 引脚 6 | CS — Chip select / wake input |
| 引脚 7 | TXD — Transmit data from MCU to bus |
| 引脚 8 | RXD — Receive data from bus to MCU |
| 引脚 9 | INT — Interrupt output to MCU |
| 引脚 10 | RST — Reset input (active low) |
| 引脚 11 | GPIO1 — General-purpose I/O 1 |
| 引脚 12 | GPIO2 — General-purpose I/O 2 |
| 引脚 13 | GPIO3 — General-purpose I/O 3 |
| 引脚 14 | HS_OUT — High-side driver output |
| 引脚 15 | LS_OUT — Low-side driver output |
| 引脚 16 | VSUP_SENSE — Battery voltage sense input |
| 引脚 17 | TEMP — Temperature monitor output |
| 引脚 18 | NC — Not connected (per datasheet) |
| 引脚 19 | NC — Not connected (per datasheet) |
| 引脚 20 | NC — Not connected (per datasheet) |
| 引脚 21 | NC — Not connected (per datasheet) |
| 引脚 22 | WAKE — Wake-up input from bus activity |
| 引脚 23 | SLEEP — Sleep mode control input |
| 引脚 24 | FAULT — Fault status output (open-drain) |
| 引脚 25 | LIN_COMPAT — LIN compatibility mode select |
| 引脚 26 | NC — Not connected (per datasheet) |
| 引脚 27 | NC — Not connected (per datasheet) |
| 引脚 28 | NC — Not connected (per datasheet) |
| 引脚 29 | NC — Not connected (per datasheet) |
| 引脚 30 | NC — Not connected (per datasheet) |
| 引脚 31 | NC — Not connected (per datasheet) |
| 引脚 32 | NC — Not connected (per datasheet) |
| 引脚 33 | EP — Exposed thermal pad - tie to GND |
典型应用
MCZ33781EK 适用于 6 应用s: Automotive Body Control Module (BCM), HVAC Control Panel Networking, Automotive Lighting Controller, Door-Zone and Seat/Mirror Modules, Steering-Column Switch Interface, Industrial Distributed I/O Networks.
Automotive Body Control Module (BCM)
The MCZ33781EK acts as the master DSI2 node inside a body control module, aggregating switch inputs and driving lamp/relay outputs across a 2-wire differential DSI bus. Its -40C to +90C industrial/automotive grade and integrated load-dump/reverse-battery protection suit 12V automotive battery rails, while the master role allows the BCM MCU to poll up to 16 slave nodes for switch and lamp status. Using DSI rather than point-to-point wiring reduces harness weight and pin count at the BCM connector, which is critical for cost-sensitive vehicle programs.
推荐
HVAC Control Panel Networking
In HVAC control panels, the MCZ33781EK provides the master interface to remote DSI slave ICs that drive blower-speed FETs, mode-door actuators, and temperature sensors. Its wide operating temperature window handles the thermal stress of behind-dash mounting, and its on-chip diagnostics report wiring faults back to the head unit. Compared with LIN-based HVAC architectures, DSI offers higher data throughput for faster knob-response feedback while keeping the wiring harness small.
推荐
Automotive Lighting Controller
Headlamp levelers, ambient lighting modules, and central lighting controllers use the MCZ33781EK as a DSI2 master to command multiple slave LED-driver or bulb-driver nodes. The integrated high-side/low-side driver capability simplifies drive of moderate-current lamps directly while protecting against shorts. Designers can replace bulky relay boxes with a compact DSI daisy-chain, reducing wiring complexity and supporting PWM dimming commands over the same bus used for status feedback.
推荐
Door-Zone and Seat/Mirror Modules
Door-zone controllers, seat modules, and power-mirror modules integrate the MCZ33781EK to communicate with the BCM over DSI while locally managing window lifters, mirror adjusters, and seat-position motors. The exposed-pad 32-SOIC package allows compact PCB footprints suitable for the cramped geometry of door and seat enclosures, and the -40C to +90C rating handles summer cabin temperatures up to 70C with margin. The same bus carries wake-up events from door-handle touch sensors back to the BCM.
推荐
Steering-Column Switch Interface
Steering-column switch modules use the MCZ33781EK to transmit multi-function switch (MFS) state - turn signals, wiper, high-beam, cruise - over DSI to the BCM, eliminating the traditional clock-spring slip-ring wiring. Its low standby current supports wake-on-switch behavior, allowing the BCM to remain in sleep mode until a steering-column button is pressed. Industrial-grade EMI robustness helps reject the heavy electrical noise generated by nearby motors and relays in the steering column.
推荐
Industrial Distributed I/O Networks
Outside automotive, the MCZ33781EK can serve as a master in industrial distributed I/O networks where a single MCU must poll many remote sensor and actuator nodes over a robust differential bus. Its industrial -40C to +90C temperature grade, integrated protections, and wake/sleep capability suit factory automation panels, agricultural machinery, and heavy-equipment control units. The DSI protocol's deterministic polling model is simpler to implement than CAN for low-bandwidth, point-to-multipoint wiring.
推荐
推荐产品汇总
工程参考数据： MCZ33781EK ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MCZ33780EF | MCZ33972AEW |
|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors - same brand | NXP Semiconductors - same brand |
| Package | 32-SOIC-EP | 32-SOIC-EP - same | 32-SOIC-EP - same |
| Function | DSI2 Master Transceiver | DSI2 Slave Transceiver | SPI-to-DSI Gateway |
| Bus Role | Master | Slave | Bridge (SPI host side) |
| Operating Temperature | -40C to +90C | -40C to +90C | -40C to +125C (Grade 1) |
| Pin-Compatible Drop-In | N/A (target) | No - slave role, pinout differs | No - bridge role, pinout differs |
关键差异点
- Master-role DSI2 transceiver in 32-SOIC-EP （对比 MCZ33780EF)
- Direct DSI2 master protocol (no SPI host required) （对比 MCZ33972AEW)
设计说明
The 32-SOIC-EP package dissipates bus-driver heat through the exposed pad (pin 33). Solder the EP to a copper pour of at least 1 square inch (645 mm^2) connected to the ground plane. Estimated: at 500 mA continuous high-side drive and VBAT=14V, internal dissipation is roughly 1W, requiring the EP pour to keep junction temperature rise below 40C. Without proper EP soldering, the device may trigger thermal shutdown during sustained bus traffic.
Place a 100 nF decoupling capacitor as close as possible to the VCC pin (pin 2) and a 10 uF bulk capacitor at VBAT (pin 1). For DBUS_H and DBUS_L, use a controlled-impedance differential pair (typically 100 ohm) and route away from switching nodes. Add a TVS diode (e.g., SMBJ24CA) and optional common-mode choke at the bus connector for automotive EMI/ESD immunity per NXP's reference layout.
Because the MCZ33781EK is now End of Life, do not start new high-volume designs without securing last-time-buy stock or qualifying the NXP recommended replacement (consult the NXP Cross-Reference tool). A common pitfall is assuming the MCZ33780EF is a drop-in master; it is actually the SLAVE counterpart, so its pinout differs at functional pins. Verify any replacement's pinout against the original datasheet before board rework.
合规信息
RoHS and REACH compliance per DigiKey and NXP product listings. AEC-Q100 grade not specifically called out by NXP for this -40C to +90C industrial/automotive part; verify against the latest PCN if automotive Grade 1 qualification is required.
