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

Infineon Technologies TLE4945L

Name: TLE4945L
Brand: Infineon Technologies
SKU: TLE4945L
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLE4945L

Manufacturer:: Infineon Technologies

Category:: Switches (Solid State)

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

Datasheet:: TLE4945L.pdf

Description:: MAGNETIC SWITCH BIPOLAR SSO-3-2

Quantity:: RFQ Add To RFQ list

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Inventory:3,670

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Product details

Overview

TLE4945L from Infineon Technologies is a bipolar Hall-effect IC switch designed for magnetic field sensing in automotive and industrial systems. It features open-collector output, reverse polarity protection, temperature-compensated switching 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 TLE4945L datasheet, TLE4945L pinout, TLE4945L application, or TLE4945L equivalent, key selection criteria include bipolar magnetic response, integrated reverse-voltage and ESD protection, open-collector drive capability, wide operating temperature range, and PG-SSO-3-2 surface-mount package compatibility with high-vibration environments.

Technical Context

The TLE4945L integrates a Hall generator, amplifier, Schmitt trigger, internal voltage reference, and protection diodes on a single silicon die. Its bipolar latching behavior requires both positive and negative magnetic fields to toggle output state - turn-on at +B_OP, turn-off only at –B_RP.

Internal reverse-polarity protection enables operation with supply connections reversed up to –40 V (400 ms), while output stage withstands –32 V transients and –100 mA reverse current. The open-collector Q pin supports pull-up to voltages up to 32 V independent of VS.

Key Specifications

Parameter	Value and Actual Design Meaning
Switch Type	Bipolar latching Hall switch: requires alternating polarity fields to operate/release - prevents false triggering in unidirectional field drift.
Operate Point B_OP	±3.5 mT (typ.): defines minimum field strength needed to switch output low; tight tolerance ensures consistent actuation across temperature.
Release Point B_RP	∓2.5 mT (typ.): defines field reversal threshold to release output; hysteresis (1.0 mT) rejects noise-induced toggling.
Supply Voltage Range	3.8 V to 24 V: supports direct connection to automotive battery (12 V nominal) and industrial 24 V rails without external regulation.
Output Configuration	Open-collector NPN: allows wired-OR logic, level-shifting up to 32 V, and direct interface with microcontroller GPIO or relay drivers.
Operating Temperature	–40 °C to +150 °C: qualified for under-hood automotive use and industrial motor control enclosures without derating.
Reverse Polarity Withstand	–40 V for 400 ms: eliminates need for external series diode in battery-connected applications, reducing BOM count and PCB area.

Pinout & Package

Package: PG-SSO-3-2 (Plastic Small Outline, 3-pin, exposed pad, 2.08 mm × 1.35 mm footprint, 0.65 mm pitch).

Pin/Terminal	Circuit Role	Design Meaning
1 - VS	Positive supply input	Accepts 3.8–24 V DC; includes on-chip reverse-polarity protection diode cathode - connects directly to battery or power rail.
2 - GND	Ground reference	Low-impedance return path for Hall sensor, amplifier, and output stage; tied to exposed thermal pad for improved heat dissipation.
3 - Q	Open-collector output	NPN transistor emitter grounded internally; collector accessible externally - requires external pull-up to define logic HIGH voltage and sink current up to 100 mA.

Key Features

Feature	Design Value
Bipolar magnetic response	Enables position detection with rotating magnets (e.g., gear tooth sensing) where field polarity alternates - no external signal conditioning required.
Integrated reverse polarity protection	Withstands –40 V supply misconnection for 400 ms, eliminating need for external series diode and associated voltage drop/power loss.
Temperature-compensated thresholds	B_OP/B_RP variation ≤ ±0.1 mT/°C ensures stable switching points from –40 °C to +150 °C - critical for engine compartment sensors.
ESD and transient-protected output	Q pin rated for –32 V transients and –100 mA reverse current - survives load-dump and inductive kickback in motor control circuits.
PG-SSO-3-2 package	Small 2.08 × 1.35 mm outline with exposed thermal pad improves thermal resistance (R_thJA = 190 K/W) and mechanical robustness in high-vibration environments.

Applications

Brushless DC Motor Commutation

Rotational Indexing

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

IC Role / Device Role / Timing Role: Bipolar latching Hall switch providing precise, jitter-free edge timing for electronic commutation logic.

Use Value: Eliminates mechanical brushes and enables >90% motor efficiency; B_OP/B_RP hysteresis prevents chatter during low-speed rotation.

Use Scenario: Counting gear teeth or cam lobes on rotating shafts for speed and position feedback.

IC Role / Device Role / Timing Role: Magnetic field zero-crossing detector generating clean digital pulses per feature passing the sensor.

Use Value: Open-collector output interfaces directly with 5 V or 3.3 V microcontrollers; wide temp range ensures accuracy in gearbox housings.

Seat Belt Buckle Detection

Valve Position Sensing

Use Scenario: Confirming buckle engagement via embedded magnet movement relative to fixed sensor location.

IC Role / Device Role / Timing Role: Proximity switch detecting presence/absence of ferrous or permanent magnet targets within 1–3 mm air gap.

Use Value: Reverse polarity protection prevents damage during vehicle assembly wiring; AEC-Q100 qualification supports automotive safety systems.

Use Scenario: Monitoring linear or rotary motion of solenoid- or stepper-driven valves in HVAC or fluid control systems.

IC Role / Device Role / Timing Role: End-of-travel or mid-stroke position indicator using magnet-attached actuator and fixed Hall sensor.

Use Value: Bipolar operation distinguishes valve open/closed states without auxiliary circuitry; 150 °C rating suits engine-mounted actuators.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Allegro A3295L	Higher B_OP/B_RP (±5.0/∓3.5 mT), wider supply range (3.0–26.5 V), but no reverse polarity protection.	Lacks integrated reverse-voltage protection - requires external diode in battery-fed designs.	Select when higher magnetic sensitivity is needed and board space permits external protection components.
Melexis US1881	Lower supply current (4 mA vs. 8 mA), same bipolar latching function, but only rated to +125 °C junction.	Not qualified for under-hood automotive use above 125 °C ambient.	Select for cost-sensitive industrial controls where temperature does not exceed 125 °C.

Compared with A3295L and US1881, the TLE4945L uniquely combines bipolar latching, reverse polarity protection, and full AEC-Q100-compliant 150 °C operation - making it optimal for automotive BLDC motors and safety-critical proximity sensing where reliability under electrical abuse is mandatory.

Availability

TLE4945L is available at Aetrix Electronics and suitable for brushless DC motor commutation, rotational indexing, seat belt buckle detection, and valve position sensing requiring stable component supply across automotive production cycles and industrial equipment lifecycles.

Supply support for TLE4945L 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 was engineered specifically for robust magnetic sensing in harsh automotive and industrial environments - emphasizing latch stability, thermal resilience, and integrated protection against real-world electrical faults.

FAQ

What magnetic field polarity triggers the TLE4945L output?

The TLE4945L is a bipolar latching switch: a positive magnetic field (south pole toward branded side) turns the output ON (Q pulled low); only a sufficiently strong negative field (north pole toward branded side) releases it back to HIGH. This prevents unintended toggling from field drift or vibration.

Can the TLE4945L be used with a 3.3 V microcontroller?

Yes - its open-collector output allows external pull-up to 3.3 V, while the internal circuitry operates from a minimum 3.8 V supply. Use a separate 5 V or 12 V rail for VS, and tie the Q pull-up to the microcontroller's I/O voltage domain for safe interfacing.

Does the TLE4945L require an external pull-up resistor?

Yes - the Q pin is an open-collector NPN output and must be pulled up externally. Typical values range from 2.2 kΩ to 10 kΩ depending on rise time requirements and load voltage (up to 32 V). No internal pull-up is present.

Is the TLE4945L qualified for automotive applications?

Yes - it meets AEC-Q100 stress test requirements for Grade 1 (–40 °C to +125 °C ambient) and is widely deployed in automotive subsystems including BLDC fans, transmission sensors, and seat occupancy detection, with full qualification documentation available from Infineon.

TLE4945L Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: TLE

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

Packaging:: Cut Tape (CT)

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

TLE4945L FAQ

1.How can I place an order for TLE4945L through Aetrix?

Please submit a Request for Quotation (RFQ) for TLE4945L 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 TLE4945L reliable?

The price and inventory of TLE4945L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLE4945L is usually 5 days.

3.What payment methods are accepted for TLE4945L?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLE4945L transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLE4945L?

TLE4945L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLE4945L 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 TLE4945L?

For technical support, including TLE4945L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLE4945L requirements.

6.How does Aetrix verify that TLE4945L is sourced from the original manufacturer or authorized distributors?

All TLE4945L 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 TLE4945L meets industry standards.

7.What is the process for return or replacement of TLE4945L?

All TLE4945L units undergo pre-shipment inspection (PSI). If there is an issue with TLE4945L, 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 TLE4945L part is unused and in its original packaging.

Return procedure for TLE4945L:

1.Submit a request within 90 days.

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

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