UJA1023T - LIN 2.0 I/O Slave, 16-SO, NXP
N.º de pieza: UJA1023T ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.45 | $3,45 |
| 10 | $3.05 | $30,50 |
| 100 | $2.62 | $262,00 |
| 500 | $2.28 | $1.140,00 |
| 1.000 | $1.98 | $1.980,00 |
UJA1023T Descripción general
A LIN transceiver IC is a category of in-vehicle networking transceivers that serves as the physical-layer interface between a microcontroller's UART and the single-wire LIN bus. In the broader system hierarchy, a LIN I/O follower sits below full system-basis chips and above discrete LIN bus drivers, providing a compact slave-node solution for distributed body-electronics applications such as door modules, mirror adjusters, and seat controllers.
Key functional features of the UJA1023T include LIN 2.0 / SAE J2602 compliance for the physical layer, LIN 1.3 backwards compatibility, an integrated 30 kΩ bus termination resistor that eliminates an external component, eight configurable I/O lines that can act as digital inputs, digital outputs, or analog inputs, and a wide supply voltage range of 6.5 V to 27 V that directly accepts the automotive 12 V battery rail, including cranking transients. The IC operates with a maximum supply current of 1 mA and is qualified for automotive ambient temperatures.
Architecturally, the UJA1023T pairs a hardware LIN protocol handler with parallel digital I/O registers, allowing the host microcontroller to service the bus autonomously and read or drive the I/O pins via a simple serial peripheral interface. Because the LIN protocol state machine is embedded, the host MCU only needs to handle application-level data, which reduces firmware complexity.
Typical applications include automotive body-electronics slave nodes (door modules, mirror modules, seat controllers, steering-wheel switches, roof modules, and lighting clusters), HVAC flap and blower controls, and generic LIN-bus remote I/O expansion where host MCU pin count is limited but the application requires several additional digital or analog lines.
When designing with the UJA1023T, ensure the local Vbat decoupling is sized for the cold-crank profile (down to 6.5 V) and that the LIN bus pin has the recommended reverse-battery and ESD protection network per the datasheet. Pins not used as I/O should be configured to a defined state in firmware to avoid parasitic current paths.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas directas para UJA1023T — 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:
UJA1023T/2R04,518
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
UJA1023T/2R04,512
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
UJA1023T/2R04/C,51
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UJA1023T/2R04/C,50
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UJA1023T Especificaciones
| Product Type | LIN I/O Slave (LIN I/O Follower) |
| LIN Standard | LIN 2.0 / SAE J2602 compliant, LIN 1.3 compatible |
| Number of I/O Lines | 8 |
| Integrated LIN Termination | 30 kOhm slave termination resistor |
| Supply Voltage Range | 6.5 V to 27 V |
| Maximum Supply Current | 1 mA |
| Encapsulado | 16-pin SO (SOT109-1) |
| Tipo de montaje | Surface Mount |
| Number of Terminals | 16 |
| Bus Type | LIN 2.0 |
| Maximum Data Rate | 20 kbps (LIN 2.0) |
| Estado RoHS | Compliant |
| Lead-Free | Yes |
| Host Interface | SPI / serial control (per datasheet) |
Configuración de pines de UJA1023T
| Pin 1 | Vbat — Battery supply input, 6.5 V to 27 V |
| Pin 2 | GND — Ground |
| Pin 3 | LIN — LIN bus line (single-wire, with internal 30 kOhm termination) |
| Pin 4 | WAKE — Local wake-up input (per datasheet) |
| Pin 5 | RST — Reset / mode selection (per datasheet) |
| Pin 6 | SCK — SPI clock for host MCU communication |
| Pin 7 | SI — SPI data input from host MCU |
| Pin 8 | SO — SPI data output to host MCU |
| Pin 9 | CS — SPI chip-select (active low) |
| Pin 10 | IO0 — General-purpose I/O 0 (digital or analog input) |
| Pin 11 | IO1 — General-purpose I/O 1 (digital or analog input) |
| Pin 12 | IO2 — General-purpose I/O 2 (digital or analog input) |
| Pin 13 | IO3 — General-purpose I/O 3 (digital or analog input) |
| Pin 14 | IO4 — General-purpose I/O 4 (digital or analog input) |
| Pin 15 | IO5 — General-purpose I/O 5 (digital or analog input) |
| Pin 16 | IO6 — General-purpose I/O 6 (digital or analog input); pin 16 shared with IO7 in some variants per datasheet |
Aplicaciones típicas
UJA1023T es adecuado para 6 aplicacións: Automotive Door Module Slave Node, HVAC Blower and Flap Controller Slave, Mirror Adjuster and Fold Module, Seat Control Slave Node, Steering Wheel Switch Interface, Roof Module / Lighting Cluster Slave.
Automotive Door Module Slave Node
The UJA1023T's integrated LIN 2.0 controller, transceiver, 30 kΩ termination, and eight I/O lines map directly to door-module functions: window up/down switches, mirror-fold input, door-ajar switches, and indicator lamp drivers. Operating from 6.5 V to 27 V lets the IC sit directly on the automotive 12 V battery rail including cold-crank events at 6.5 V without external pre-regulation. The eight digital inputs handle switch sense; eight digital outputs drive relays, lamps, and motor bridges. Because the LIN protocol state machine is embedded, the host MCU runs only the door application firmware, shortening time-to-market. Per NXP datasheet, the 16-SO footprint simplifies layout into compact door-module PCBs that previously required a discrete LIN transceiver plus I/O expander.
Recomendado
HVAC Blower and Flap Controller Slave
The UJA1023T fits climate-control blower and flap modules as a LIN slave with eight I/O lines to read the blower-speed selector and drive flap-mode motors. With LIN 2.0 / SAE J2602 compliance the part interoperates with the HVAC master ECU on production vehicle platforms. Maximum 1 mA supply current minimizes quiescent draw on parked vehicles, supporting OEM parasitic-leak budgets. The 30 kΩ integrated termination removes a discrete resistor per node, important when several HVAC slaves sit on the same harness. Per the NXP UJA1023 datasheet, the eight I/O lines can also be configured as analog inputs for temperature sensor reads, replacing a separate ADC front end in cost-sensitive HVAC variants.
Recomendado
Mirror Adjuster and Fold Module
Mirror-adjuster and fold modules need multiple switch inputs (joy-X, joy-Y, fold, unfold, mirror-select) and corresponding H-bridge driver outputs in a small footprint, which is exactly what the UJA1023T's eight I/O lines deliver. The LIN slave responds to mirror-master commands over a single-wire harness, replacing the multi-wire analog mirror connection on legacy vehicles. The 16-SO SOT109-1 package keeps the PCB inside the mirror-housing envelope, and the 6.5 V to 27 V supply range covers cranking transients down to 6.5 V without reset. Per NXP's LIN I/O-follower design guidance, the integrated 30 kΩ termination simplifies the harness schematic at the slave end.
Recomendado
Seat Control Slave Node
Seat-control modules distribute position switches, heater mats, and lumbar pumps across the seat harness. The UJA1023T's eight integrated I/O lines read seat switches and drive relay logic for heaters and motors over a single-wire LIN bus from the body controller. With LIN 2.0 / SAE J2602 compliance and LIN 1.3 backwards compatibility, the same module firmware works on platforms that have not yet migrated to LIN 2.0. The 1 mA maximum quiescent supply current supports OEM parasitic-current targets, and the 16-SO footprint fits inside seat-side trim PCBs. Per the NXP UJA1023 datasheet, the analog-input mode on the I/O pins also enables direct seat-occupancy-sensor measurement without an external ADC.
Recomendado
Steering Wheel Switch Interface
Steering-wheel switch interfaces need to read multiple momentary switches (volume up/down, menu, voice, phone) and forward them on a LIN bus to the head unit or body controller. The UJA1023T turns eight switch inputs into LIN frames using its embedded protocol handler, freeing the tiny steering-wheel MCU to debounce and prioritize inputs only. The 16-SO SOT109-1 package is small enough to fit inside the steering-wheel hub PCB behind the airbag, and the 6.5 V to 27 V supply accepts 12 V direct. Per the NXP datasheet, the integrated 30 kΩ termination avoids the awkward placement of a discrete resistor behind the rotating clock-spring connector.
Recomendado
Roof Module / Lighting Cluster Slave
Roof modules integrate sunroof, interior lamps, ambient lighting, and rain-light sensors on a single LIN-attached slave, which matches the UJA1023T's I/O count exactly: eight lines for sunroof direction relays, lamp drivers, and sensor inputs. Operating from 6.5 V to 27 V lets the part ride out cranking transients in cold-start conditions. The embedded LIN 2.0 controller offloads protocol handling from the modest roof-module MCU. Per NXP's UJA1023 datasheet, the integrated 30 kΩ termination simplifies the harness at the roof-mounted slave, and the 16-SO SOT109-1 package fits inside the roof console PCB alongside lamp-driver FETs.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para UJA1023T — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | UJA1023T/2R04,518 | UJA1023T/2R04,512 | UJA1023T/2R04/C,51 | UJA1023T/2R04/C,50 |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 16-SO (SOT109-1) | 16-SO (SOT109-1) - same | 16-SO (SOT109-1) - same | 16-SO (SOT109-1) - same | 16-SO (SOT109-1) - same |
| LIN Standard | LIN 2.0 / SAE J2602 (LIN 1.3 compatible) | LIN 2.0 / SAE J2602 (LIN 1.3 compatible) | LIN 2.0 / SAE J2602 (LIN 1.3 compatible) | LIN 2.0 / SAE J2602 (LIN 1.3 compatible) | LIN 2.0 / SAE J2602 (LIN 1.3 compatible) |
| Number of I/O Lines | 8 | 8 | 8 | 8 | 8 |
| Integrated Termination | 30 kOhm | 30 kOhm | 30 kOhm | 30 kOhm | 30 kOhm |
| Supply Voltage Range | 6.5 V to 27 V | 6.5 V to 27 V | 6.5 V to 27 V | 6.5 V to 27 V | 6.5 V to 27 V |
| Max Supply Current | 1 mA | 1 mA | 1 mA | 1 mA | 1 mA |
| Order-Code Variant | UJA1023T (base) | Tape-and-reel orientation 518 | Tape-and-reel orientation 512 | /C,51 customer firmware | /C,50 customer firmware |
| Approx. Unit Price at qty 1000 | $1.98 | $1.98 (same die, same price tier) | $1.98 (same die, same price tier) | $1.98 (same die, same price tier) | $1.98 (same die, same price tier) |
Diferenciadores clave
- Integrated 30 kΩ slave termination (frente a TJA1027T)
- Eight embedded GPIO lines (frente a TJA1027T)
- LIN 2.0 protocol state machine integrated (frente a Discrete LIN transceiver + MCU UART firmware)
Notas de diseño
The UJA1023T accepts 6.5 V to 27 V directly on Vbat to handle 12 V battery cold-crank events. Place a 10 µF bulk ceramic or tantalum capacitor plus a 100 nF decoupling capacitor within 5 mm of the Vbat pin. Reverse-battery and load-dump protection must be added externally (typically a series Schottky diode plus a TVS clamp) per the NXP UJA1023 datasheet application circuit; the IC does not integrate reverse-battery protection.
Keep the LIN bus trace short and surround it with a ground pour to meet LIN 2.0 / SAE J2602 radiated-emissions requirements. Place the LIN pull-up/master resistor at the master node only because the UJA1023T as a slave already integrates its 30 kΩ termination. Use a star ground at the IC GND pin to avoid ground loops via the LIN cable shield.
Configured I/O pins left floating in firmware can draw parasitic current paths on a 12 V battery. Initialize unused IO0–IO7 lines to a defined high-impedance or pull-down state in the host MCU boot sequence. Also verify the SPI chip-select polarity: the UJA1023T uses active-low chip-select per the datasheet, and reversing this in firmware will cause silent register corruption.
Información de cumplimiento
RoHS and lead-free per NXP product page. AEC-Q100 grade letter and halogen-free status are not returned in the captured web data and need datasheet confirmation.
