L9638D013TR - 20kbaud LIN Bus Transceiver | STMicroelectronics
MPN： L9638D013TR ✓ 啟用中L9638D013TR 概覽
A LIN (Local Interconnect Network) transceiver is a physical-layer interface IC that sits between a microcontroller's protocol handler and the physical single-wire vehicle bus. In the hierarchy of semiconductor devices, a LIN transceiver is an automotive bus transceiver, which is a line driver and receiver, which is an interface IC, which is an integrated circuit. LIN networks use a single wire plus a shared ground return, which keeps harness weight low compared with CAN or RS-485 multi-wire buses and makes the topology ideal for doors, seats, mirrors, climate control units and body control modules.
Key features of the L9638D013TR include transmission rate up to 20 kbaud, a wide 6 V to 26 V operating supply range with 40 V transient withstand, low sleep-mode quiescent current of typically 10 uA, and three independent wake-up paths: wake-up through the LIN bus, an Enable input that is CMOS compatible from a microcontroller, and an edge-driven wake-up input. Transmit and receive delays are specified at 4000 ns and 6000 ns respectively, and the wide input and output ranges support both ISO 9141 and LIN signalling.
Architecturally the L9638 combines a LIN output stage with a level-shifted receiver and an integrated voltage reference, plus internal protection structures for reverse battery, load dump and ESD events on the bus line. Because the transceiver dominates the quiescent budget of a body module in sleep, the 10 uA typical sleep current is what allows long-term parking drain budgets to be met, while the CMOS-compatible enable pin lets the host MCU gate the device directly.
Typical applications include LIN sub-bus nodes in automotive body control modules, seat and door modules, climate control panels, mirror actuators, ambient light and rain sensors, window lift controllers, and any ECU that must wake from a low-current sleep state and rejoin a 20 kbaud LIN network. The ISO 9141 compatibility also makes it useful in mixed legacy diagnostic architectures.
When designing around this device, place the bus-line protection and pull-up network close to the LIN pin, keep the wake-up and enable traces away from the high-voltage transients on the supply pins, and verify that the host microcontroller's TX/RX levels match the CMOS-compatible Enable and wake-up input thresholds. The 40 V transient rating gives headroom on 12 V and 24 V battery systems, but the device is not a substitute for a dedicated LIN bus protection diode network on severe-load networks.
This page consolidates manufacturer feature data, verified distributor availability, drop-in SO-8 alternatives from STMicroelectronics, NXP Semiconductors, Melexis and onsemi, plus practical layout and integration notes that are not presented together on a single manufacturer datasheet.
直接替換替代品，適用於 L9638D013TR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： L9638D013TR （相同外形與佔位） — 差異在於 Product Type.
L9638D
✅ 直接替換聯絡詢價
查看資料表 →L9638D013
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TJA1020T/1
✅ 直接替換📋 參考替代品（不在目錄中）
TJA1021T/1
✅ 直接替換📋 參考替代品（不在目錄中）
TH8082-00
✅ 直接替換📋 參考替代品（不在目錄中）
NCV7321D12R2G
✅ 直接替換📋 參考替代品（不在目錄中）
L9638D013TR 規格
| Product Type | LIN bus transceiver (single-wire, half duplex) |
| Transceiver Configuration | 1 driver / 1 receiver |
| Supported Protocols | LIN and ISO 9141 |
| Maximum Transmission Rate | 20 kbaud |
| Operating Supply Voltage Range | 6 V to 26 V |
| Transient Supply Tolerance | 40 V |
| Sleep-Mode Quiescent Current | 10 uA typical |
| Wake-Up Sources | LIN bus, Enable input (uC CMOS compatible), edge-driven wake-up input |
| Transmit Delay | 4000 ns max |
| Receive Delay | 6000 ns max |
| Package Type | SO-8 (8-SOIC, 0.154 in / 3.90 mm width) |
| 安裝類型 | Surface Mount |
| Operating Voltage Range (DigiKey listing) | 6 V to 26 V |
| Datasheet Page Count | 14 pages |
| Manufacturer | STMicroelectronics |
L9638D013TR so-8 (8-soic, 0.154 in / 3.90 mm width) 腳位配置指南
L9638D013TR（so-8 (8-soic, 0.154 in / 3.90 mm width) 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： L9638D013TR.
請參閱 資料表 以查看完整腳位配置。
典型應用
L9638D013TR 適用於 6 應用s: Automotive Body Control Module LIN Sub-Bus, Door and Seat Module LIN Nodes, Climate Control Panel and HVAC Interface, Automotive Sensor and Actuator Slaves, Mirror and Window Lift Actuator Controllers, Industrial and Appliance LIN-Compatible Single-Wire Networks.
Automotive Body Control Module LIN Sub-Bus
The L9638D013TR fits a body control module that sits on a LIN sub-bus alongside CAN or LIN main-bus nodes, because the 20 kbaud rate matches the LIN standard and the 6 V to 26 V operating range covers 12 V battery transients up to 40 V. The 10 uA typical sleep current keeps the module's parking drain low, while the Enable input lets the host MCU gate the transceiver between communication bursts. Bus wake-up lets a remote door or seat module restart the BCM without the main MCU leaving deep sleep. The single-wire bus plus shared ground also keeps harness weight low compared with a CAN implementation.
推薦
Door and Seat Module LIN Nodes
Door lock, window lift and seat adjustment modules are classic LIN applications, and the L9638D013TR provides the physical layer for them with a 1/1 driver-receiver configuration and 20 kbaud transmission capability. Its 4000 ns transmit delay and 6000 ns receive delay fit comfortably within LIN frame timing at that rate. The CMOS-compatible Enable input lets the module's microcontroller deassert the transceiver between actuator commands, and the edge-driven wake-up input supports wake from a discrete door-switch or seat-occupancy signal. The 8-SOIC package keeps board area small in space-constrained door and seat ECUs.
推薦
Climate Control Panel and HVAC Interface
A climate control panel or HVAC head unit that talks to a LIN fan, flap or sensor sub-network uses the L9638D013TR to bridge the microcontroller to the bus. Because the device is compatible with ISO 9141 systems as well as LIN, it can also serve legacy sub-networks found in older vehicle platforms. The 6 V to 26 V supply range with 40 V transient withstand suits direct battery connection in cabin modules, and the low 10 uA sleep quiescent current prevents the HVAC electronics from draining the battery during extended parking. Single-wire topology keeps connector pin count and harness cost low in the cabin.
推薦
Automotive Sensor and Actuator Slaves
Ambient light, rain, humidity, temperature and air-quality sensors that hang off a LIN bus are typically slaves that must wake on bus activity and stay in a low-current sleep state between updates. The L9638D013TR supports bus wake-up directly, so the sensor node can be woken without the host microcontroller running continuously, and the 10 uA typical sleep current keeps module self-discharge low. The 20 kbaud rate matches standard LIN sensor update periods, and the small 8-SOIC footprint suits sealed sensor housings where board area is constrained.
推薦
Mirror and Window Lift Actuator Controllers
Mirror folding, window lift and wiper actuator controllers are position-closed LIN slaves whose electronics must survive cranking and load-dump transients while parked. The L9638D013TR operating from 6 V to 26 V with 40 V transient tolerance provides that margin, and the sleep current of 10 uA typical allows months of parking without a battery drain. Wake-up through the LIN bus lets the driver-side master module wake the actuator on demand, and the edge-driven wake-up input can be tied to a position-sensor or door event. The 8-SOIC package fits into the tight actuator housings commonly used in door modules.
推薦
Industrial and Appliance LIN-Compatible Single-Wire Networks
Outside the vehicle, the L9638D013TR also suits equipment that standardises on the LIN physical layer, such as small appliance panels, vending equipment and instrumentation slaves, because the single-wire bus plus ground return is inexpensive to cable over long distances inside a machine. The 20 kbaud rate is adequate for sensor and actuator commands rather than bulk data, and the wide 6 V to 26 V supply range tolerates 12 V or 24 V industrial rails with margin. The CMOS-compatible Enable input allows a system master to gate bus activity, and ISO 9141 compatibility helps when mixing legacy single-wire nodes.
推薦
推薦產品摘要
工程參考資料，適用於 L9638D013TR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | L9638D | TJA1020T/1 | TJA1021T/1 | TH8082-00 | NCV7321D12R2G |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | NXP Semiconductors | NXP Semiconductors | Melexis | onsemi |
| Package | SO-8 (8-SOIC, 0.154 in / 3.90 mm width) | SO-8 - same | SO-8 - same | SO-8 - same | SO-8 - same | SO-8 - same |
| Product Type | Single-wire LIN bus transceiver, 1 driver / 1 receiver | Single-wire LIN bus transceiver, 1 driver / 1 receiver | Single-wire LIN bus transceiver | Single-wire LIN bus transceiver | Single-wire LIN bus transceiver | LIN bus transceiver with integrated regulator |
主要差異化特點
- Three independent wake-up paths in one SO-8 device (對比TJA1020T/1)
- Documented ISO 9141 compatibility alongside LIN (對比TH8082-00)
- Sleep-mode quiescent current of 10 uA typical (對比NCV7321D12R2G)
- Same-family second source with identical pinout and ratings (對比L9638D)
設計說明
Route the LIN bus line as a short, controlled-impedance-free trace directly from the transceiver pin to the connector, and place the external pull-up resistor and any protection diode network immediately at the transceiver end. The LIN bus is a sensitive single-wire node; keeping the loop area small reduces radiated emissions into adjacent audio, RF and sensor circuits in the same ECU. Avoid running the LIN trace parallel to switching power inductors or motor phases, and cross such nets at right angles when unavoidable.
Decouple the supply pins locally with a combination of bulk capacitance and a high-frequency ceramic capacitor placed within a few millimetres of the device, and keep the return current path short to the ground pin. The 6 V to 26 V operating range and 40 V transient rating protect the internal structures from automotive pulses, but decoupling still determines how the transceiver behaves during load-dump events and supply dips. Where the module is powered from an unregulated battery, verify the maximum transient at the connector and confirm the device never sees more than 40 V including tolerance.
Do not assume a cross-brand SO-8 LIN transceiver is a functional match: check enable polarity, the presence of an edge-driven wake-up input, and the LIN bus pull-up architecture before swapping the L9638D013TR. Also verify that the host microcontroller's TX and RX pins tolerate the transceiver's logic levels, and that the firmware keeps the bus line recessive during sleep so that bus wake-up still works. Mixing pull-up strengths or an incorrect sleep entry sequence is the most common cause of a node that will not wake on the LIN bus.
Estimated: in a LIN node the transceiver dissipation is dominated by bus drive current, not by quiescent current, because the LIN bus is pulled up through an external resistor and the driver only sources current during the dominant bits. At a 10 V bus pull-up and roughly 10 mA of dominant-state current, device dissipation stays well under 20 mW, so the 8-SOIC package needs no heatsinking. The thermal budget is therefore driven by the supply pin and the transient pulses rather than steady-state linear operation.
合規資訊
The manufacturer datasheet describes an automotive LIN bus transceiver, but no explicit RoHS, REACH, AEC-Q100, lead-free or halogen-free statements were published in the pages used for this listing. Compliance status should be confirmed against the current STMicroelectronics material declaration for the exact order code.
