TLE4274GS V33 LG Equivalent & Substitute Parts

Part Overview

The TLE4274GS V33 LG is a linear voltage regulator IC from Infineon Technologies' OPTIREG™ series, delivering a fixed 3.3V output at 400mA in a SOT223-4 surface mount package. This automotive-grade component (AEC-Q100 qualified) is designed for applications requiring stable low-dropout regulation with integrated protection features including over-current, over-temperature, reverse polarity, and short-circuit protection.

The TLE4274GS V33 LG is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain compatibility with existing designs while meeting automotive qualification requirements.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	400mA
Input Voltage (Max)	40V
Dropout Voltage (Max)	1.2V @ 300mA
Quiescent Current	220 µA
PSRR	60dB (100Hz)
Operating Temperature Range	-40°C ~ 150°C
Package	SOT223-4 (TO-261-4, TO-261AA)
Grade	Automotive
Qualification	AEC-Q100
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit

Substitute Part Grouping Explanation

Substitution eligibility for the TLE4274GS V33 LG is determined by the following critical parameters:

Primary Compatibility Criteria:

Fixed output voltage of 3.3V
Surface mount SOT223-4 package (TO-261-4, TO-261AA)
Automotive grade with AEC-Q100 qualification
Operating temperature range of -40°C to 150°C
Positive output configuration with fixed output type

Secondary Compatibility Criteria:

Output current capability (minimum 400mA for full equivalence; lower ratings acceptable for current-limited applications)
Input voltage maximum rating (40V or higher)
Dropout voltage performance
Integrated protection features (over-current, over-temperature, reverse polarity, short-circuit)

The substitute parts are grouped into two categories: full parametric equivalents (matching 400mA output current) and functional alternatives (reduced output current with enhanced quiescent current performance).

Parameter Comparison

Parameter	TLE4274GS V33 LG	TLE42744GSV33HTMA1	NCV4274AST33T3G	NCV8664CST33T3G	TPS7B6933QDCYRQ1
Manufacturer	Infineon	Infineon	onsemi	onsemi	Texas Instruments
Output Voltage	3.3V	3.3V	3.3V	3.3V	3.3V
Output Current	400mA	400mA	400mA	150mA	150mA
Input Voltage (Max)	40V	40V	40V	45V	40V
Dropout Voltage (Max)	1.2V @ 300mA	0.5V @ 250mA	1.27V @ 250mA	Not specified	0.8V @ 100mA
Quiescent Current	220 µA	220 µA	250 µA	29 µA	25 µA
PSRR	60dB (100Hz)	60dB (100Hz)	60dB (100Hz)	67dB (100Hz)	60dB (100Hz)
Operating Temperature	-40°C ~ 150°C	-40°C ~ 150°C	-40°C ~ 150°C	-40°C ~ 150°C	-40°C ~ 150°C
Package	SOT223-4	SOT223-4	SOT223	SOT223	SOT223-4
Grade	Automotive	Automotive	Automotive	Automotive	Automotive
AEC-Q100	Yes	Yes	Yes	Yes	Yes
Product Status	Discontinued	Active	Active	Active	Active

Engineering Selection Recommendations

Full Parametric Equivalents (400mA Output Current):

The TLE42744GSV33HTMA1 (Infineon) and NCV4274AST33T3G (onsemi) are direct functional replacements for the TLE4274GS V33 LG. Both maintain 400mA output current capability, identical 3.3V fixed output voltage, and automotive AEC-Q100 qualification. The TLE42744GSV33HTMA1 offers improved dropout voltage performance (0.5V @ 250mA versus 1.2V @ 300mA), while the NCV4274AST33T3G provides equivalent performance with higher inventory availability. Both are currently in active production status.

Functional Alternatives (150mA Output Current):

The NCV8664CST33T3G (onsemi) and TPS7B6933QDCYRQ1 (Texas Instruments) are suitable substitutes for applications where output current requirements do not exceed 150mA. These parts offer superior quiescent current performance (29 µA and 25 µA respectively, compared to 220 µA in the original design), making them advantageous for battery-powered or low-power standby applications. Both maintain automotive AEC-Q100 qualification and identical 3.3V output voltage. The TPS7B6933QDCYRQ1 includes Under Voltage Lockout (UVLO) protection, providing additional circuit protection.

Selection Criteria:

For designs requiring full 400mA output current: select TLE42744GSV33HTMA1 or NCV4274AST33T3G
For designs with maximum 150mA output current requirements: select NCV8664CST33T3G or TPS7B6933QDCYRQ1
For low-power applications prioritizing quiescent current: select TPS7B6933QDCYRQ1 (25 µA) or NCV8664CST33T3G (29 µA)
For improved dropout voltage performance: select TLE42744GSV33HTMA1 (0.5V @ 250mA)

All substitute parts maintain identical package compatibility (SOT223-4), operating temperature range (-40°C to 150°C), and automotive qualification requirements.

Frequently Asked Questions (FAQ)

Q: Can NCV8664CST33T3G or TPS7B6933QDCYRQ1 be used as direct replacements for the TLE4274GS V33 LG?

A: These parts are functionally compatible only for applications where output current does not exceed 150mA. The original TLE4274GS V33 LG is rated for 400mA output current. If your design requires the full 400mA capability, use TLE42744GSV33HTMA1 or NCV4274AST33T3G instead.

Q: Are all substitute parts automotive qualified?

A: Yes. All listed substitute parts carry AEC-Q100 automotive qualification and are rated for the -40°C to 150°C operating temperature range, matching the original TLE4274GS V33 LG specifications.

Q: What is the difference between the TLE42744GSV33HTMA1 and NCV4274AST33T3G?

A: Both are 400mA, 3.3V fixed output regulators in SOT223-4 packages with automotive qualification. The TLE42744GSV33HTMA1 (Infineon) offers lower dropout voltage (0.5V @ 250mA) compared to the NCV4274AST33T3G (onsemi, 1.27V @ 250mA). The NCV4274AST33T3G has higher inventory availability. Selection depends on dropout voltage requirements and supply chain considerations.

Q: Are the package dimensions identical across all substitute parts?

A: Yes. All substitute parts use the SOT223-4 package (TO-261-4, TO-261AA), ensuring identical PCB footprint compatibility with the original TLE4274GS V33 LG design.

Q: What protection features are included in each substitute part?

A: TLE42744GSV33HTMA1 and TLE4274GS V33 LG include over-current, over-temperature, reverse polarity, and short-circuit protection. NCV4274AST33T3G includes over-temperature, reverse polarity, and short-circuit protection (no over-current). NCV8664CST33T3G includes all four protection types. TPS7B6933QDCYRQ1 includes over-current, over-temperature, short-circuit, and under-voltage lockout (UVLO) protection.

Q: Which substitute offers the lowest quiescent current?

A: The TPS7B6933QDCYRQ1 offers the lowest quiescent current at 25 µA, followed by NCV8664CST33T3G at 29 µA. These are significantly lower than the original TLE4274GS V33 LG at 220 µA, making them suitable for battery-powered applications where standby current is critical.

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