TLE4274D V33 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The TLE4274D V33 is a linear voltage regulator IC from Infineon Technologies' OPTIREG™ series, delivering a fixed 3.3V output at 400mA in a TO-252-3 (DPAK) surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The regulator incorporates automotive-grade qualification (AEC-Q100) and comprehensive protection features including over-current, over-temperature, reverse polarity, and short-circuit protection, suitable for automotive and industrial applications requiring reliable 3.3V power delivery.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	3.3	V
Output Current	400	mA
Input Voltage (Max)	40	V
Dropout Voltage (Max)	1.2 @ 300mA	V
Quiescent Current	220	µA
PSRR	60	dB (100Hz)
Operating Temperature Range	-40 to 150	°C (TJ)
Package	TO-252-3 (DPAK)	-
Grade	Automotive	-
Qualification	AEC-Q100	-

Substitute Part Grouping Explanation

Substitution of the TLE4274D V33 is determined by the following critical parameters:

Fixed output voltage of 3.3V
Output current capability of 400mA or greater
Maximum input voltage of 36V or higher
TO-252-3 (DPAK) package compatibility
Automotive-grade qualification preferred for AEC-Q100 applications
Protection features: Over-current, over-temperature, and short-circuit protection

Substitute parts are grouped into two categories: parametric equivalents from the same manufacturer (Infineon) and cross-manufacturer alternatives that meet or exceed the electrical specifications. Parts with higher output current ratings (500mA) are acceptable substitutes as they provide enhanced current delivery capability while maintaining voltage regulation accuracy.

Parameter Comparison

Part Number	Manufacturer	Output Voltage (V)	Output Current (mA)	Input Voltage Max (V)	Dropout Voltage (V)	Quiescent Current (µA)	Operating Temp (°C)	AEC-Q100	Product Status
TLE4274D V33	Infineon	3.3	400	40	1.2 @ 300mA	220	-40 to 150	Yes	Obsolete
TLE4274DV33ATMA2	Infineon	3.3	400	40	1.2 @ 300mA	220	-40 to 150	Yes	Active
NCV4274ADT33RKG	onsemi	3.3	400	40	1.27 @ 250mA	250	-40 to 150	Yes	Obsolete
BD3570FP-E2	Rohm	3.3	500	36	—	30	-40 to 125	No	Not For New Designs
BD3570YFP-ME2	Rohm	3.3	500	36	0.48 @ 200mA	50	-40 to 125	No	Active
LF33CDT-TR	STMicroelectronics	3.3	500	16	0.7 @ 500mA	1000	-40 to 125	No	Active
LF33CDT-TRY	STMicroelectronics	3.3	500	16	1.3 @ 500mA	2000	-40 to 125	Yes	Obsolete
LM2936QDT-3.3/NOPB	Texas Instruments	3.3	50	40	0.4 @ 50mA	15	-40 to 125	Yes	Active
LM2936QDTX-3.3/NOPB	Texas Instruments	3.3	50	40	0.4 @ 50mA	15	-40 to 125	Yes	Active

Engineering Selection Recommendations

Primary Substitute (Direct Replacement): TLE4274DV33ATMA2 from Infineon Technologies is the direct parametric equivalent with identical electrical specifications and the same TO-252-3 package. This part is currently in active production status with 5,578 units in stock, making it the preferred choice for applications requiring exact functional replacement. Both parts maintain AEC-Q100 automotive qualification and identical protection feature sets.

Secondary Substitute (Automotive-Grade Alternative): NCV4274ADT33RKG from onsemi provides equivalent 400mA output current and 40V maximum input voltage with AEC-Q100 qualification. Dropout voltage is marginally higher at 1.27V versus 1.2V, and quiescent current is slightly elevated at 250µA. This part is suitable for automotive applications where AEC-Q100 compliance is mandatory, though it is currently obsolete.

Higher Current Alternatives: BD3570YFP-ME2 (Rohm) and LF33CDT-TR (STMicroelectronics) offer 500mA output current in the same TO-252-3 package. BD3570YFP-ME2 is active and provides improved current delivery with lower quiescent current (50µA). LF33CDT-TR is active but features a lower maximum input voltage (16V) and significantly higher quiescent current (1mA), making it suitable only for applications with input voltages below 16V.

Low-Current Alternative: LM2936QDT-3.3/NOPB and LM2936QDTX-3.3/NOPB from Texas Instruments are suitable only for applications requiring 50mA or less output current. These parts maintain 40V input voltage rating and AEC-Q100 qualification but are not direct replacements for 400mA load requirements.

Not Recommended: LF33CDT-TRY (obsolete status) and BD3570FP-E2 (not for new designs status) should be avoided for new designs despite meeting electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can TLE4274DV33ATMA2 directly replace TLE4274D V33?

A: Yes. TLE4274DV33ATMA2 is a parametric equivalent with identical output voltage (3.3V), output current (400mA), input voltage rating (40V), dropout voltage (1.2V @ 300mA), quiescent current (220µA), and operating temperature range (-40°C to 150°C). Both parts use the TO-252-3 package and maintain AEC-Q100 automotive qualification. The primary difference is product status: TLE4274DV33ATMA2 is active production while the original is obsolete.

Q: Are higher current-rated substitutes (500mA) compatible with 400mA applications?

A: Yes. BD3570YFP-ME2 and LF33CDT-TR both deliver 500mA output current and are compatible with applications designed for 400mA. Higher current capability does not affect circuit operation; the regulator delivers only the current demanded by the load. Both parts maintain the TO-252-3 package footprint and pin configuration.

Q: What is the significance of the 16V input voltage limit on LF33CDT-TR?

A: LF33CDT-TR has a maximum input voltage of 16V compared to 40V for the TLE4274D V33. This part is suitable only for applications with input voltages not exceeding 16V. Applications requiring higher input voltage tolerance (up to 40V) must use alternatives such as TLE4274DV33ATMA2, NCV4274ADT33RKG, or BD3570YFP-ME2.

Q: Why is quiescent current important in substitute selection?

A: Quiescent current represents the regulator's internal power consumption when no load is connected. The TLE4274D V33 draws 220µA. Substitutes with significantly higher quiescent current (such as LF33CDT-TR at 1mA or LF33CDT-TRY at 2mA) may impact battery-powered or low-power standby applications. For standard applications, this difference is negligible.

Q: Are all substitute parts AEC-Q100 qualified?

A: No. Only TLE4274DV33ATMA2, NCV4274ADT33RKG, LF33CDT-TRY, LM2936QDT-3.3/NOPB, and LM2936QDTX-3.3/NOPB carry AEC-Q100 automotive qualification. BD3570FP-E2, BD3570YFP-ME2, and LF33CDT-TR do not have AEC-Q100 certification. For automotive applications requiring AEC-Q100 compliance, select only qualified alternatives.

Q: Can LM2936 series parts replace the TLE4274D V33?

A: LM2936 series parts (50mA output current) are not suitable direct replacements for 400mA applications. These parts are appropriate only for low-current auxiliary power supplies or bias circuits. Applications requiring 400mA output current must use alternatives with matching or higher current ratings.

Q: What packaging considerations apply to these substitutes?

A: All listed substitute parts use the TO-252-3 (DPAK) surface mount package with identical pin configuration and footprint compatibility. No PCB layout modifications are required for mechanical substitution. Verify tape and reel versus tube packaging availability based on procurement requirements.

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