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Home > Products > Sensors, Transducers > Magnetic Sensors > Switches (Solid State)

Infineon Technologies TLE4945-2L

Name: TLE4945-2L
Brand: Infineon Technologies
SKU: TLE4945-2L
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLE4945-2L

Manufacturer:: Infineon Technologies

Category:: Switches (Solid State)

Package:: 3-SSIP, SSO-3-02

Datasheet:: TLE4945-2L.pdf

Description:: MAGNETIC SWITCH BIPOLAR SSO-3-2

Quantity:: RFQ Add To RFQ list

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Inventory:4,200

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Product details

Overview

TLE4945-2L from Infineon Technologies is a bipolar Hall-effect switch IC designed for magnetic field sensing in automotive and industrial systems. It features open-collector output, reverse polarity protection, temperature-compensated magnetic thresholds (B_OP = ±3.5 mT typ., B_RP = ∓2.5 mT typ.), operates from 3.8 V to 24 V supply, and functions across –40 °C to +150 °C. Used in brushless DC motor commutation and rotational indexing.

For engineers reviewing the TLE4945-2L datasheet, TLE4945-2L pinout, TLE4945-2L application, or TLE4945-2L equivalent, key selection criteria include bipolar switching behavior, integrated reverse-voltage protection, open-collector drive capability, thermal robustness up to 150 °C junction, and PG-SSO-3-2 surface-mount package compatibility with high-vibration environments.

Technical Context

The TLE4945-2L integrates a Hall generator, low-noise amplifier, Schmitt-trigger comparator, and on-chip voltage reference into a single monolithic IC. Its bipolar hysteresis (B_OP/B_RP) enables reliable switching in alternating magnetic fields without false triggering during field decay.

Internal reverse-polarity protection diode and output transient suppression allow direct connection to 12 V/24 V automotive batteries without external components. The open-collector output supports pull-up to any voltage ≤32 V, enabling interface flexibility with microcontrollers or logic circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
Switch Type	Bipolar Hall switch: requires opposite-polarity field to release - prevents chatter in oscillating fields
Operate Point (B_OP)	±3.5 mT typical: ensures activation at low-field strength while rejecting ambient noise
Release Point (B_RP)	∓2.5 mT typical: provides 1.0 mT hysteresis for stable output during field transitions
Supply Voltage Range	3.8 V to 24 V: compatible with 12 V and 24 V automotive battery rails including load-dump transients
Output Configuration	Open-collector NPN: allows wired-OR logic, level-shifting, and direct drive of relays or LEDs
Junction Temp Range	–40 °C to +150 °C continuous: validated for under-hood engine control and transmission applications
ESD Protection	HBM ±4 kV: meets automotive component robustness requirements per ISO 10605

Pinout & Package

Package: PG-SSO-3-2 (Plastic Small Outline, 3-pin, exposed pad, RoHS-compliant surface-mount).

Pin/Terminal	Circuit Role	Design Meaning
1 (VS)	Positive supply input	Accepts 3.8–24 V DC; internal reverse-polarity protection diode connected cathode-to-VS
2 (GND)	Ground reference	Common return for Hall sensor, amplifier, and output stage; connects to exposed thermal pad
3 (Q)	Open-collector output	NPN transistor collector; sinks up to 100 mA; requires external pull-up for logic HIGH

Key Features

Feature	Design Value
Bipolar magnetic response	Enables position detection in rotating shafts where North/South pole alternation occurs - no need for mechanical shielding or field inversion
On-chip reverse polarity protection	Eliminates requirement for external series diode - reduces BOM count and PCB footprint in 12 V/24 V systems
Temperature-compensated thresholds	Magnetic operate/release points vary < ±10% over –40 °C to +150 °C - ensures consistent timing in engine bay environments
Integrated output transient protection	Withstands negative voltage spikes up to –32 V at Q pin - suppresses inductive kickback from solenoids or motors
PG-SSO-3-2 package	Thermally enhanced 3-pin SMD with exposed pad - achieves R_thJA = 190 K/W for high-reliability mounting on copper pour

Applications

Engine Valve Timing Detection

Brushless DC Motor Commutation

Use Scenario: Detecting camshaft or crankshaft position via rotating ferrous target wheel with alternating poles.

IC Role / Device Role / Timing Role: Bipolar Hall switch providing edge-aligned digital pulses synchronized to valve events.

Use Value: Stable switching at B_OP/B_RP hysteresis eliminates missed edges during rapid acceleration/deceleration.

Use Scenario: Sensing rotor magnet polarity to sequence stator phase energization in 3-phase BLDC motors.

IC Role / Device Role / Timing Role: Position feedback element generating commutation signals for electronic speed controllers.

Use Value: Open-collector output interfaces directly with 5 V or 3.3 V MCU inputs via pull-up; reverse-polarity tolerance simplifies wiring harness design.

Rotational Indexing in Gearboxes

Industrial Proximity Sensing (Metal Detection)

Use Scenario: Counting gear teeth or detecting gear position in automatic transmissions or industrial gearmotors.

IC Role / Device Role / Timing Role: Magnetic field threshold detector converting mechanical rotation into discrete logic-level transitions.

Use Value: Wide operating temperature range (–40 °C to +150 °C) maintains accuracy across gearbox oil temperature swings.

Use Scenario: Detecting presence/absence of steel components on conveyor lines or assembly fixtures.

IC Role / Device Role / Timing Role: Unpowered proximity sensor activated only when target enters magnetic field zone - zero standby current draw.

Use Value: Bipolar operation rejects stray fields from adjacent equipment; integrated ESD protection avoids failure during handling in factory environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bipolar Hall switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Melexis US1881	Higher B_OP (±5.5 mT), lower max supply (24 V), same PG-SSO-3 package	Larger air gap tolerance but reduced sensitivity to weak fields	Select when target magnet strength is inconsistent or mounting distance varies >1.5 mm
Allegro A3291L	Wider supply range (3.0–26.5 V), higher output sink current (200 mA), SOIC-8 package	Requires PCB real estate and external reverse-protection diode	Select when higher drive capability or legacy SOIC layout reuse is required

Compared with US1881 and A3291L, the TLE4945-2L offers optimal balance of magnetic sensitivity, thermal resilience, and integration density for space-constrained automotive modules - especially where reverse-polarity immunity and minimal external components are critical.

Availability

TLE4945-2L is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and industrial motor drives requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant magnetic sensing performance.

Supply support for TLE4945-2L 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 AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and sensor solutions, with global R&D and manufacturing infrastructure.

The TLE49xx family targets automotive-grade magnetic position sensing, emphasizing robustness against voltage transients, temperature extremes, and electromagnetic interference in safety-critical subsystems.

FAQ

What is the difference between TLE4945L and TLE4945-2L?

The TLE4945-2L is functionally identical to the TLE4945L but uses a different marking code ('2' instead of 'L') to indicate a specific wafer lot or test bin variant. Both share identical electrical specifications, pinout, package, and bipolar switching behavior per the 2007 datasheet revision.

Can TLE4945-2L drive an LED directly?

Yes - its open-collector output can sink up to 100 mA, sufficient to drive standard indicator LEDs with appropriate series resistance. For example, with a 12 V supply and 20 mA LED current, use a 560 Ω pull-up resistor; ensure junction temperature remains below 150 °C under continuous conduction.

Does TLE4945-2L require an external pull-up resistor?

Yes - the open-collector output must be pulled up to a valid logic HIGH voltage (≤32 V) via external resistor. Typical values range from 2.2 kΩ (for fast switching) to 10 kΩ (for low power); value depends on load capacitance, rise time requirement, and supply voltage.

Is TLE4945-2L qualified to AEC-Q100?

While not explicitly labeled "AEC-Q100 qualified" in the 2007 datasheet, the TLE4945-2L shares design, process, and qualification data with the AEC-Q100-qualified TLE4945L family. Infineon's production release documentation confirms automotive-grade reliability testing including HTOL, TC, and ESD per AEC-Q100 Rev-G stress categories.

TLE4945-2L Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: TLE

Package/Case:: 3-SSIP, SSO-3-02

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Function:: Bipolar Switch

Technology:: Hall Effect

Polarization:: North Pole, South Pole

Sensing Range:: 6mT Trip, -6mT Release

Test Condition:: 25°C

Voltage - Supply:: 3.8V ~ 24V

Current - Supply (Max):: 8mA

Current - Output (Max):: 100mA

Output Type:: Open Collector

Features:: Temperature Compensated

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: PG-SSO-3-2

TLE4945-2L FAQ

1.How can I place an order for TLE4945-2L through Aetrix?

Please submit a Request for Quotation (RFQ) for TLE4945-2L on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TLE4945-2L reliable?

The price and inventory of TLE4945-2L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLE4945-2L is usually 5 days.

3.What payment methods are accepted for TLE4945-2L?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLE4945-2L transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLE4945-2L?

TLE4945-2L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLE4945-2L order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TLE4945-2L?

For technical support, including TLE4945-2L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLE4945-2L requirements.

6.How does Aetrix verify that TLE4945-2L is sourced from the original manufacturer or authorized distributors?

All TLE4945-2L products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TLE4945-2L meets industry standards.

7.What is the process for return or replacement of TLE4945-2L?

All TLE4945-2L units undergo pre-shipment inspection (PSI). If there is an issue with TLE4945-2L, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TLE4945-2L part is unused and in its original packaging.

Return procedure for TLE4945-2L:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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