MC33290D - ISO 9141 K-Line Serial Link Interface | NXP
料号： MC33290D ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.85 | $28.50 |
| 100 | $2.4 | $240.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.78 | $1,780.00 |
MC33290D 概述
An ISO K-Line transceiver is a specialized automotive interface device that converts logic-level UART signals into a single-wire, current-driven bus waveform compliant with the ISO 9141 physical-layer definition. Within the broader hierarchy, K-Line transceivers sit below CAN/LIN transceivers and above raw UART bridges as a legacy but still-required physical layer for emissions-related OBD-II communication defined by CARB and EU regulatory frameworks.
Key features include a single-wire K-Line bus driver capable of sourcing and sinking bus current, internal thermal shutdown with hysteresis, integrated bus short-to-ground and short-to-battery protection on the bus pin, a wide operating voltage range to tolerate automotive load-dump transients, and a logic-level RX/TX interface that connects directly to a microcontroller UART. The IC's diagnostic mode draws minimal current when the bus is recessive, preserving quiescent power on always-on battery paths.
Architecturally, the MC33290D integrates a high-side driver and a low-side driver on the K-Line bus pin, with a comparator-based receiver that distinguishes dominant (logic 0) and recessive (logic 1) bus states. A charge pump is not required because the device operates from the vehicle's nominal 12 V supply, simplifying BOM and PCB area.
Typical applications include OBD-II diagnostic interfaces, scan-tool interfaces in service-bay equipment, ECU flashing stations, body controllers communicating with diagnostic testers, and aftermarket telematics units reading ECU K-Line parameters.
A key design consideration is that the K-Line bus pin must be terminated with an external pull-up resistor to VBAT and protected against reverse battery by an external diode or smart power path. This is optional: the IC already includes internal bus protection, but external TVS diodes are recommended for production hardware.
This page consolidates distributor pricing, drop-in alternatives, and design notes not found in the manufacturer datasheet to accelerate part selection for automotive diagnostic designs.
直接替换替代料： MC33290D ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
MC33290D/R2
✅ 直接替换📋 参考替代料（不在目录中）
MC33290DG
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC33290D 规格参数
| 功能 | ISO 9141 K-Line Serial Link Interface |
| Protocol | ISO 9141 (K-Line) |
| Supply Voltage Range | 8 V to 18 V |
| Communication Mode | Half-duplex, bidirectional |
| Bus Topology | Single-wire (K-Line) |
| 工作温度范围 | -40 C to +125 C |
| 封装 | 8-SOIC (0.154 in, 3.90 mm width) |
| 安装类型 | Surface Mount |
| Bus Protection | Short-to-ground, short-to-battery, thermal shutdown |
| Interface to MCU | Logic-level RX and TX (CMOS/TTL) |
| Lead-Free Status | Contains Lead (per DigChip listing) |
| Packaging | Tube |
| Application | Automotive on-board diagnostics (OBD) |
MC33290D 引脚配置
| 引脚 1 | K_BUS — K-Line bus pin (single-wire bidirectional ISO 9141 bus) |
| 引脚 2 | GND — Ground |
| 引脚 3 | VCC — Logic supply (5 V typical, tied to VCC) |
| 引脚 4 | RX — Receive data output to MCU UART |
| 引脚 5 | TX — Transmit data input from MCU UART |
| 引脚 6 | NC — Not connected (per datasheet) |
| 引脚 7 | VBAT — Battery supply input (8 V to 18 V) |
| 引脚 8 | NC — Not connected (per datasheet) |
典型应用
MC33290D 适用于 6 应用s: OBD-II Diagnostic Scan Tool Interface, ECU Flashing Station Interface, Aftermarket Telematics Dongle, Emissions Inspection Station Equipment, Body Control Module Diagnostic Channel, Service-Bay Diagnostic Isolator.
OBD-II Diagnostic Scan Tool Interface
The MC33290D's ISO 9141 K-Line physical-layer compliance and 8 V to 18 V automotive supply tolerance make it a direct match for OBD-II scan-tool ports required by CARB and EU emissions regulations. The integrated bus short-to-ground and short-to-battery protection survives the harsh fault environment of an under-dash J1962 connector, while the half-duplex single-wire topology matches the K-Line pin of the OBD-II connector. Placed between the vehicle's diagnostic UART and the K-Line pin with a pull-up resistor to VBAT, the IC decodes dominant/recessive bus states for KWP2000 (ISO 14230) traffic at typical 10.4 kbaud. Unlike a CAN transceiver, the MC33290D does not require a differential pair, simplifying the wiring harness at the diagnostic port.
推荐
ECU Flashing Station Interface
The MC33290D's bidirectional K-Line bus driver and thermal-shutdown protection make it suitable for end-of-line ECU flashing stations that reprogram automotive controllers via the K-Line diagnostic pin. The 8-SOIC footprint is easy to hand-solder into a programming fixture, and the wide 8 V to 18 V supply tolerance accepts bench supplies and vehicle-battery simulators without additional regulation. The internal short-circuit protection allows the fixture to tolerate mis-wired harnesses during production flashing, reducing fixture damage. Placed on the bench-isolation interface between the host PC's USB-to-serial bridge and the ECU's K-Line pin, the IC maintains the ISO 9141 timing required by production flash tools. Compared with a discrete transistor implementation, the MC33290D reduces BOM count and provides tested ISO 9141 conformance.
推荐
Aftermarket Telematics Dongle
The MC33290D's low quiescent current and 8 V to 18 V supply range from the OBD-II port make it a candidate for always-on aftermarket telematics dongles that read ECU K-Line parameters for fleet tracking and driver-behavior analytics. The IC operates across the full automotive -40 C to +125 C ambient range, which is required for dongles mounted inside a vehicle cabin or engine bay. Integrated bus protection means a mis-wired or damaged vehicle harness does not propagate faults into the telematics MCU. Compared with a CAN-only interface, adding the MC33290D provides backwards compatibility with pre-2008 vehicles that lack CAN OBD-II, increasing the dongle's addressable fleet.
推荐
Emissions Inspection Station Equipment
The MC33290D's ISO 9141 conformance and CARB OBD-II alignment allow it to be embedded in stationary inspection-station equipment that reads emissions-related ECU parameters via K-Line. The 8-SOIC surface-mount package simplifies board layout in the inspection head, and the wide operating temperature range tolerates the workshop environment without additional thermal management. Placed between the inspection station's processor UART and the vehicle's K-Line diagnostic pin via an isolation barrier, the IC provides the dominant state drive required for ISO 9141 5-baud-address initiation. Compared with a custom discrete bus-driver circuit, the MC33290D is a qualified, automotive-tested component that simplifies regulatory certification of the inspection station.
推荐
Body Control Module Diagnostic Channel
The MC33290D's compact 8-SOIC footprint and integrated bus protection make it suitable for body control modules (BCMs) that expose a K-Line diagnostic channel for service-bay diagnostics on body-domain ECUs. The 8 V to 18 V supply tolerance accepts direct battery connection without pre-regulation, and the integrated thermal shutdown prevents latch-up under continuous bus-fault conditions. Placed on the BCM's diagnostic sub-node between the body MCU UART and the K-Line service connector, the IC provides a standards-compliant ISO 9141 interface. Compared with LIN-based diagnostics, K-Line remains a regulatory requirement for many OEM service procedures, ensuring service-tool compatibility across vehicle vintages.
推荐
Service-Bay Diagnostic Isolator
The MC33290D's internal bus-fault protection and ISO 9141 compliance make it suitable for service-bay diagnostic isolators that provide galvanic isolation between a service PC's USB interface and the vehicle's K-Line bus. The 8-SOIC package fits the small isolator dongle form factor, and the wide operating temperature range tolerates the shop environment. Placed on the vehicle-side of the isolation barrier with a microcontroller UART on the host side, the MC33290D survives cross-wiring and short faults during diagnostic sessions. Compared with discrete implementations, the integrated protection reduces field returns from mis-wired service connectors.
推荐
推荐产品汇总
工程参考数据： MC33290D ——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 | MC33290D/R2 | MC33290DG |
|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Supply Voltage | 8 V to 18 V | 8 V to 18 V | 8 V to 18 V |
| Protocol | ISO 9141 K-Line | ISO 9141 K-Line | ISO 9141 K-Line |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| Bus Protection | Short-to-GND, short-to-battery, thermal shutdown | Short-to-GND, short-to-battery, thermal shutdown | Short-to-GND, short-to-battery, thermal shutdown |
| Packaging Carrier | Tube | Tape and Reel (R2) | Tube (lead-free finish) |
| Lead Finish | Contains Lead | Contains Lead | Lead-free (Pb-free) |
关键差异点
- Same-die tape-and-reel carrier variant for high-volume assembly （对比 MC33290D/R2)
- Lead-free terminal finish option for RoHS-compliant designs （对比 MC33290DG)
- Automotive-grade temperature range with integrated bus-fault protection （对比 Discrete transistor-based K-Line driver circuit)
设计说明
Place the bus pull-up resistor (typically 510 ohm to 1 kohm) as close as possible to the K_BUS pin (pin 1) to minimize ringing on the dominant edge. Keep the K_BUS trace short and away from noise sources such as the ignition coil drive and motor phase traces. Add a 100 nF decoupling capacitor on pin 7 (VBAT) and a 100 nF decoupling capacitor on pin 3 (VCC) placed within 3 mm of the respective supply pins. The exposed copper-pour under the IC must be connected to GND to provide thermal relief during sustained bus short events.
Do not connect the K_BUS pin directly to the OBD-II connector without a series protection component; an external TVS diode (such as SMAJ33CA) or a PTC resettable fuse protects the IC from load-dump transients that exceed the 18 V absolute maximum. Do not operate the IC from a supply below 8 V or above 18 V; below 8 V the bus driver cannot guarantee dominant-state drive strength, and above 18 V internal protection circuits may engage. Do not leave the TX pin floating when the host MCU is in reset; tie TX low through a 10 kohm pull-down to define the bus state during host start-up.
Route the RX and TX logic traces (pins 4 and 5) as short microstrip lines with continuous ground reference, avoiding splits in the ground plane. Isolate the analog GND (pin 2) from any noisy digital returns; a small GND bridge between the IC GND pin and the host MCU GND minimizes ground-loop noise on the RX output. If the host MCU UART operates from a different supply domain, level-shift the RX and TX signals to avoid damaging the MC33290D's 5 V logic interface. The VBAT pin (pin 7) should be fed from the same node as the upstream reverse-battery protection diode, not from a switched ignition rail, to maintain OBD-II diagnostic access when the ignition is off.
合规信息
Lead-Free Status per DigChip listing: 'Contains Lead'. RoHS status listed as '[DATA_NEEDED]' pending manufacturer confirmation; the MC33290DG variant offers Pb-free terminal finish. AEC-Q100 status not explicitly listed on NXP product page; the automotive operating temperature range suggests automotive-grade qualification but AEC-Q100 documentation should be requested from NXP for production qualification.
