Infineon Technologies TLE9251SJXUMA1

Overview

TLE9251SJXUMA1 from Infineon is a high-speed CAN FD transceiver compliant with ISO 11898-2:2016 and SAE J2284-4/-5, serving as the physical layer interface between HS CAN protocol controllers and automotive bus networks. It supports data rates up to 5 MBit/s, features <10 µA standby quiescent current, ±10 kV HBM ESD robustness, and operates across 4.5–5.5 V supply with extended common-mode immunity. Used in body control modules and gateway units requiring AEC-Q100-qualified communication interfaces.

For engineers reviewing the TLE9251SJXUMA1 datasheet, TLE9251SJXUMA1 pinout, TLE9251SJXUMA1 application, or TLE9251SJXUMA1 equivalent, key selection criteria include loop delay symmetry for CAN FD timing integrity, bus wake-up capability via RxD assertion, low EME enabling choke-free layout, and thermal shutdown at 170–190 °C for automotive reliability validation.

Technical Context

The TLE9251SJXUMA1 implements dual-receiver architecture-normal-mode and low-power receiver-with wake-up detection on the bus that asserts RxD during recessive-to-dominant transitions. Its transmitter uses matched driver stages to ensure <±1 ns loop delay asymmetry between CANH and CANL, critical for bit-rate stability above 2 MBit/s.

Mode control is managed via STB pin logic (low = normal, high = standby), with automatic power-down on VCC loss. Fail-safe functions include TxD time-out (prevents bus lock-up), overtemperature shutdown (170–190 °C trip), and short-circuit protection to ground, battery, and VCC-enabling robust operation in harsh automotive environments.

Key Specifications

Pinout & Package

Package: PG-DSO-8 (SOIC-8 variant with exposed thermal pad); RoHS-compliant, halogen-free, qualified for automated optical inspection (AOI) solder joint verification.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed CAN FD transceiver applications.

Compared with TJA1044T/3 and TLE6250G, the TLE9251SJXUMA1 uniquely combines 5 MBit/s CAN FD capability, integrated wake-up signaling, and guaranteed loop delay symmetry-making it the only choice for next-generation automotive gateways requiring deterministic high-speed domain bridging.

Availability

TLE9251SJXUMA1 is available at Aetrix Electronics and suitable for gateway modules, body control modules, and engine control units requiring stable component supply with full AEC-Q100 qualification and automotive-grade traceability.

Supply support for TLE9251SJXUMA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and security solutions, with global manufacturing and R&D centers.

The TLE9251 belongs to Infineon's automotive transceiver product line, engineered specifically for high-reliability HS CAN FD networks in electrified and autonomous vehicles-emphasizing EMC resilience, functional safety, and seamless integration with microcontroller CAN peripherals.

FAQ

What is the function of the STB pin on the TLE9251SJXUMA1?

The STB (Stand-by) pin is an active-low digital input controlling operational mode: logic low enables normal operation with full bus activity; logic high enters standby mode, reducing VCC current to <10 µA while retaining bus wake-up detection. Internal pull-up ensures default normal mode if left unconnected, simplifying design for single-mode applications.

Does the TLE9251SJXUMA1 require an external common-mode choke?

No. The TLE9251SJXUMA1 achieves very low electromagnetic emission (EME) through precisely matched CANH/CANL edge rates and internal common-mode filtering, allowing full compliance with CISPR 25 Class 5 radiated emissions limits without external chokes-even at 5 MBit/s. This reduces BOM count, PCB area, and system cost.

How does the TxD time-out function protect the CAN network?

The TxD time-out function monitors the TxD input for continuous dominant state (>250 µs). If detected, it forces the transmitter into recessive state automatically, preventing bus lock-up caused by MCU firmware hangs or faulty controller output. This maintains network availability for other nodes without requiring software intervention or external watchdog circuits.

Is the TLE9251SJXUMA1 compatible with both 3.3 V and 5 V microcontrollers?

Yes-the TLE9251SJXUMA1 accepts 3.3 V or 5 V logic levels on TxD and interprets them correctly due to CMOS-compatible input thresholds (V_IL ≤ 0.3×V_CC, V_IH ≥ 0.7×V_CC). RxD output swings rail-to-rail (0 V to V_CC), so it directly interfaces with either 3.3 V or 5 V MCUs without level-shifting circuitry.