TLE42644G Equivalent & Substitute Parts

Part Overview

The TLE42644G is a linear voltage regulator IC from Infineon Technologies' OPTIREG™ series, delivering a fixed 5V output at 100mA in a surface-mount SOT223-4 package. This automotive-grade component (AEC-Q100 qualified) integrates comprehensive protection features including over-current, over-temperature, reverse polarity, and short-circuit protection, with an operating range of -40°C to 150°C.

The TLE42644G is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	TLE42644G Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	40V
Dropout Voltage	0.5V @ 100mA
Quiescent Current	60 µA
PSRR	68dB (100Hz)
Operating Temperature	-40°C ~ 150°C (TJ)
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 for the TLE42644G is determined by the following critical parameters:

Output Voltage: Must be fixed at 5V
Output Current Capability: Minimum 100mA required for direct replacement; higher ratings acceptable
Input Voltage Range: Maximum 40V or higher
Package Type: SOT223-4 (TO-261-4, TO-261AA) for mechanical and thermal compatibility
Dropout Voltage: 0.5V or lower preferred for circuit margin
Operating Temperature: -40°C to 150°C or equivalent range
Automotive Grade & AEC-Q100: Required for automotive applications

Substitute parts are categorized into two groups:

Group 1 – Parametric Equivalents (Direct Replacements): Parts with identical or superior electrical specifications and active product status.

Group 2 – Manufacturer Recommended Alternatives: Parts with modified output current ratings or slightly different protection feature sets, suitable for applications where the exact 100mA specification is not critical.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Operating Temperature	Package	Grade	AEC-Q100	Product Status
TLE42644G	Infineon	5V	100mA	40V	0.5V @ 100mA	60 µA	-40°C ~ 150°C	SOT223-4	Automotive	Yes	Obsolete
TLE42644GHTMA1	Infineon	5V	100mA	40V	0.5V @ 100mA	70 µA	-40°C ~ 150°C	SOT223-4	Automotive	Yes	Active
TLE42644GHTSA3	Infineon	5V	100mA	40V	0.5V @ 100mA	60 µA	-40°C ~ 150°C	SOT223-4	Automotive	Yes	Active
L5150BNTR	STMicroelectronics	5V	150mA	40V	0.5V @ 150mA	80 µA	-40°C ~ 150°C	SOT223-4	Automotive	Yes	Active
LM2936MP-5.0/NOPB	Texas Instruments	5V	50mA	40V	0.4V @ 50mA	9 µA	-40°C ~ 125°C	SOT223-4	Industrial	No	Active
LM2936MPX-5.0/NOPB	Texas Instruments	5V	50mA	40V	0.4V @ 50mA	9 µA	-40°C ~ 125°C	SOT223-4	Industrial	No	Active
LM2936QMPX-5.0/NOPB	Texas Instruments	5V	50mA	40V	0.4V @ 50mA	9 µA	-40°C ~ 125°C	SOT223-4	Automotive	Yes	Active
LM340MP-5.0/NOPB	Texas Instruments	5V	1.5A	35V	2V @ 1A	8 mA	0°C ~ 125°C	SOT223-4	Industrial	No	Active
LM340MPX-5.0/NOPB	Texas Instruments	5V	1.5A	35V	2V @ 1A	8 mA	0°C ~ 125°C	SOT223-4	Industrial	No	Active
NCV2931AST-5T3G	onsemi	5V	100mA	26V	0.6V @ 100mA	1 mA	-40°C ~ 125°C	SOT223-4	Automotive	Yes	Active
NCV8664CST50T3G	onsemi	5V	150mA	45V	0.6V @ 150mA	29 µA	-40°C ~ 150°C	SOT223-4	Automotive	Yes	Active

Engineering Selection Recommendations

For Direct Replacement (Automotive Applications)

TLE42644GHTSA3 is the primary direct substitute. It maintains identical electrical specifications to the original TLE42644G (100mA output, 60 µA quiescent current, 0.5V dropout), operates across the full -40°C to 150°C temperature range, carries AEC-Q100 qualification, and is in active production status with substantial inventory (380,100 pcs). The only packaging difference is Tape & Reel format instead of bulk.

TLE42644GHTMA1 is an alternative from Infineon with marginally higher quiescent current (70 µA vs. 60 µA) but otherwise equivalent performance and active status.

For Higher Current Capability

L5150BNTR (STMicroelectronics) and NCV8664CST50T3G (onsemi) both provide 150mA output current while maintaining 5V fixed output, SOT223-4 packaging, automotive grade, and AEC-Q100 qualification. Both operate to -40°C to 150°C. These are suitable where circuit design permits higher current capacity.

For Lower Current Applications

LM2936QMPX-5.0/NOPB (Texas Instruments) provides 50mA output with automotive grade and AEC-Q100 qualification. This part is appropriate only if circuit requirements do not exceed 50mA.

For Non-Automotive Applications

NCV2931AST-5T3G (onsemi) offers 100mA output, automotive grade, and AEC-Q100 qualification but with reduced maximum input voltage (26V vs. 40V). This part is suitable for circuits with input voltages not exceeding 26V.

LM340MP-5.0/NOPB and LM340MPX-5.0/NOPB (Texas Instruments) provide significantly higher current (1.5A) but lack automotive qualification and operate only to 0°C minimum temperature. These are not recommended for automotive applications requiring the full -40°C to 150°C range.

Frequently Asked Questions (FAQ)

Q: Can TLE42644GHTSA3 directly replace TLE42644G in automotive applications?

A: Yes. TLE42644GHTSA3 is a parametric equivalent with identical output voltage (5V), output current (100mA), dropout voltage (0.5V @ 100mA), operating temperature range (-40°C to 150°C), and protection features. Both are automotive grade with AEC-Q100 qualification. The primary difference is packaging format (Tape & Reel vs. bulk) and active production status.

Q: What is the key difference between TLE42644GHTSA3 and TLE42644GHTMA1?

A: Both are Infineon parts with identical electrical specifications except quiescent current: TLE42644GHTSA3 draws 60 µA (matching the original), while TLE42644GHTMA1 draws 70 µA. For low-power applications where quiescent current is critical, TLE42644GHTSA3 is preferred.

Q: Can I use L5150BNTR or NCV8664CST50T3G as substitutes?

A: These parts are suitable substitutes if your circuit design permits 150mA output current instead of 100mA. Both maintain 5V output, SOT223-4 packaging, automotive grade, and AEC-Q100 qualification across -40°C to 150°C. Dropout voltage is slightly higher (0.6V vs. 0.5V), which may affect low-input-voltage circuits.

Q: Why are LM2936 and LM340 series not recommended as primary substitutes?

A: LM2936 series (50mA output) provides insufficient current for 100mA applications. LM340 series (1.5A output) lacks automotive qualification and operates only to 0°C minimum, making them unsuitable for automotive designs requiring -40°C operation. Additionally, LM340 exhibits higher dropout voltage (2V @ 1A) and higher quiescent current (8 mA).

Q: What is the significance of AEC-Q100 qualification?

A: AEC-Q100 qualification certifies the component meets automotive industry reliability and quality standards. For automotive applications, substitutes must maintain this qualification. TLE42644GHTSA3, L5150BNTR, NCV8664CST50T3G, NCV2931AST-5T3G, and LM2936QMPX-5.0/NOPB all carry AEC-Q100 qualification.

Q: Does packaging format (Tape & Reel vs. Cut Tape) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly processes. Electrical and thermal performance remain identical. TLE42644GHTSA3 in Tape & Reel format is electrically equivalent to bulk-packaged TLE42644G.

Q: Can NCV2931AST-5T3G replace TLE42644G in all applications?

A: NCV2931AST-5T3G is suitable only for circuits where maximum input voltage does not exceed 26V. The original TLE42644G accepts up to 40V input. For circuits operating above 26V input, this part is not compatible.

Q: What should I verify before implementing a substitute part?

A: Verify that your circuit design accommodates the substitute's electrical specifications: output current capability, maximum input voltage, dropout voltage, operating temperature range, and protection features. Confirm packaging compatibility with your PCB assembly process. For automotive applications, confirm AEC-Q100 qualification is maintained.

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