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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Infineon Technologies TLE42664G

Name: TLE42664G
Brand: Infineon Technologies
SKU: TLE42664G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLE42664G

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-261-4, TO-261AA

Datasheet:: TLE42664G.pdf

Description:: IC REG LINEAR 5V 100MA SOT223-4

Quantity:: RFQ Add To RFQ list

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Inventory:2,547

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Product details

Overview

TLE42664G from Infineon Technologies is a monolithic low-dropout linear voltage regulator delivering a fixed 5 V ±2% output (up to 50 mA) or ±3% (up to 100 mA), with typ. 40 µA quiescent current, integrated enable input, reverse-polarity protection, and overtemperature shutdown. It operates across -40°C to +150°C and supports automotive battery-connected standby applications.

For engineers reviewing the TLE42664G datasheet, TLE42664G pinout, TLE42664G application, or TLE42664G equivalent, this device is selected for ultra-low-I_Q 5 V regulation in AEC-Q100-qualified automotive subsystems requiring high thermal robustness, fault resilience, and SOT223-4 footprint compatibility with legacy TLE4266 variants.

Technical Context

The TLE42664G implements a bandgap-referenced control amplifier with integrated saturation sensing, thermal shutdown circuitry, and current-limit protection. Its architecture enables stable regulation under wide input voltage range (5.5–40 V) while maintaining sub-500 mV dropout at 100 mA load.

It features an internal pull-down resistor on EN (1.0 MΩ), logic-level enable threshold (VEN,ON ≥ 3.5 V), and dual-stage thermal protection: shutdown at 151–200°C with 25°C hysteresis. The GND/heat slug pin provides both electrical reference and thermal path to PCB copper.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V ±2% (5–50 mA); ±3% (5–100 mA) - ensures MCU/Sensor supply compliance across automotive load profiles
Dropout Voltage	250–500 mV @ 100 mA - enables operation down to VI = 5.5 V, critical for cold-cranking scenarios
Quiescent Current	Typ. 40 µA @ 100 µA load - minimizes battery drain in always-on vehicle modules
Enable Threshold	VEN,ON ≥ 3.5 V; VEN,OFF ≤ 0.8 V - compatible with 3.3 V/5 V logic without level-shifting
Thermal Shutdown	151–200°C activation with 25°C hysteresis - prevents latch-up during transient overload
Input Voltage Range	5.5–40 V - withstands load-dump transients up to ISO 7637-2 Pulse 5a (40 V)
ESD Robustness	HBM ±3 kV, CDM ±1500 V - meets AEC-Q100 stress requirements for assembly and field use

Pinout & Package

Package: PG-SOT223-4 (exposed heat slug), RoHS-compliant, AEC-Q100 qualified.

Pin/Terminal	Circuit Role	Design Meaning
1 (I)	Input	Primary VIN connection; requires local ceramic decoupling directly to GND
2 (EN)	Enable Input	Active-high logic control; internal 1.0 MΩ pull-down ensures safe default-off state
3 (Q)	Regulated Output	5 V regulated output; requires low-ESR capacitor (≤2 Ω @ 10 kHz) for stability
4 (/Heat slug)	GND / Thermal Pad	Internally connected to die substrate and GND; must be soldered to PCB ground plane for thermal and electrical integrity

Key Features

Feature	Design Value
Ultra-low quiescent current	40 µA typ. enables >10-year battery life in always-on automotive modules (e.g., telematics wake-up circuits)
Reverse-polarity protection	Withstands -30 V input without damage - eliminates need for external series diode in battery-reversal-prone environments
Integrated current limiting	150–500 mA trip threshold prevents catastrophic failure during short-circuit events
Wide operating temperature	-40°C to +150°C junction range supports under-hood placement without derating
Pin-compatible upgrade	Direct replacement for TLE4266-2 and functional drop-in for TLE4266 with 60% lower I_Q

Applications

Body Control Module (BCM)

Advanced Driver Assistance Systems (ADAS) Sensors

Use Scenario: Powering microcontrollers and CAN transceivers in door modules, lighting controllers, and seat position memory systems.

IC Role / Device Role / Timing Role: Primary 5 V LDO supplying core logic and interface ICs in distributed automotive ECUs.

Use Value: 40 µA I_Q and AEC-Q100 qualification ensure zero parasitic drain and long-term reliability in unswitched battery domains.

Use Scenario: Supplying radar MMIC bias, image sensor analog front-ends, and inertial measurement units in ADAS camera/radar fusion boxes.

IC Role / Device Role / Timing Role: Low-noise, thermally robust 5 V source for precision analog signal chains requiring stable reference rails.

Use Value: <100 mV load/line regulation and 68 dB PSRR suppress power rail noise from switching DC/DC converters sharing the same battery input.

Infotainment Head Unit

Electric Power Steering (EPS) ECU

Use Scenario: Providing clean 5 V for USB PHYs, audio codecs, and touch controller interfaces in head units with persistent memory backup.

IC Role / Device Role / Timing Role: Secondary regulated rail isolated from noisy main 12 V bus via LDO topology.

Use Value: Reverse-polarity protection and 40 V max input tolerate jump-start conditions and alternator transients without external protection.

Use Scenario: Powering torque sensor signal conditioners and motor gate drivers' logic supplies in safety-critical EPS control units.

IC Role / Device Role / Timing Role: Safety-relevant 5 V supply with dual thermal shutdown and current limiting per ISO 26262 ASIL-B support.

Use Value: 150–200°C shutdown threshold and 25°C hysteresis prevent thermal runaway while enabling rapid recovery after transient overload.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-I_Q automotive LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
NCP1117ST50T3G	Fixed 5 V, 1 A rating, 6 mA I_Q, no EN pin, TO-220/SOT-223 package	Lacks enable control and ultra-low I_Q; suited for non-standby, higher-current loads	Select when cost-sensitive designs require higher output current and do not need enable or sub-100 µA standby draw
TLV73350PDBVR	5 V, 300 mA, 35 µA I_Q, EN pin, SOT-23-5 package, not AEC-Q100 qualified	Smaller footprint but lacks automotive qualification and reverse-polarity protection	Select for non-automotive portable electronics where space and ultra-low I_Q outweigh qualification needs

Compared with NCP1117ST50T3G and TLV73350PDBVR, the TLE42664G uniquely combines AEC-Q100 qualification, reverse-polarity tolerance, EN control, and 40 µA I_Q in a single SOT223-4 package-making it the only choice for safety-critical, battery-permanent automotive LDO applications.

Availability

TLE42664G is available at Aetrix Electronics and suitable for body control modules, ADAS sensor nodes, infotainment systems, and electric power steering ECUs requiring stable component supply under automotive-grade lifecycle management.

Supply support for TLE42664G 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 industrial control solutions, with global manufacturing and qualification infrastructure.

The OPTIREG™ linear product line delivers AEC-Q100-qualified voltage regulators engineered specifically for harsh automotive environments-including engine bay, chassis, and safety-critical ECUs-where reliability, thermal resilience, and fault protection are mandatory.

FAQ

What is the minimum input voltage required for regulation at full 100 mA load?

The TLE42664G maintains regulation down to 5.5 V input across its full operating temperature range. At 100 mA load and 25°C, the dropout voltage is typically 250 mV, meaning V_IN ≥ 5.25 V suffices-but the 5.5 V minimum accounts for worst-case variation and thermal drift per datasheet specification P_4.2.1.

Can the EN pin be left floating in the application?

No. The EN pin has an internal 1.0 MΩ pull-down resistor, but leaving it floating risks noise-induced toggling or unintended disablement. It must be actively driven to ≥3.5 V for enable or ≤0.8 V for disable-or tied directly to V_IN/GND through a hard-wired logic interface per Table 1 and P_5.1.15–P_5.1.16.

Is external output capacitance mandatory, and what are the limits?

Yes. A minimum 10 µF ceramic output capacitor with ESR ≤2 Ω (at 10 kHz) is required for stability, as specified in Table 3 (P_4.2.2–P_4.2.3). Lower ESR improves transient response; higher ESR risks oscillation. Tantalum or aluminum electrolytics are not recommended due to ESR and lifetime limitations.

How does the thermal shutdown behave during continuous overload?

The device shuts down at 151–200°C junction temperature and remains off until junction cools by ≥25°C (hysteresis). However, datasheet note P_4.1.2 explicitly states that protection functions are not designed for continuous repetitive operation-prolonged cycling indicates inadequate heatsinking or excessive ambient temperature, requiring PCB layout revision or derating.

TLE42664G Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: OPTIREG™

Package/Case:: TO-261-4, TO-261AA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 40V

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.5V @ 100mA

Current - Output:: 100mA

Current - Quiescent (Iq):: 60 µA

Current - Supply (Max):: 4 mA

PSRR:: 68dB (100Hz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature, Reverse Polarity, Short Circuit

Operating Temperature:: -40°C ~ 150°C

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT223-4

TLE42664G FAQ

1.How can I place an order for TLE42664G through Aetrix?

Please submit a Request for Quotation (RFQ) for TLE42664G 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 TLE42664G reliable?

The price and inventory of TLE42664G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLE42664G is usually 5 days.

3.What payment methods are accepted for TLE42664G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLE42664G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLE42664G?

TLE42664G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLE42664G 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 TLE42664G?

For technical support, including TLE42664G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLE42664G requirements.

6.How does Aetrix verify that TLE42664G is sourced from the original manufacturer or authorized distributors?

All TLE42664G 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 TLE42664G meets industry standards.

7.What is the process for return or replacement of TLE42664G?

All TLE42664G units undergo pre-shipment inspection (PSI). If there is an issue with TLE42664G, 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 TLE42664G part is unused and in its original packaging.

Return procedure for TLE42664G:

1.Submit a request within 90 days.

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

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