LM2936MPX-5.0 Equivalent & Substitute Parts

Part Overview

The LM2936MPX-5.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 50mA in SOT-223-4 surface mount packaging. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. The regulator provides over temperature, reverse polarity, and short circuit protection across an operating range of -40°C to 125°C with a maximum input voltage of 40V.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	50mA
Voltage Dropout (Max)	0.4V @ 50mA
Input Voltage (Max)	40V
Quiescent Current	9 µA
PSRR	60dB (120Hz)
Operating Temperature	-40°C ~ 125°C
Package	SOT-223-4
Protection Features	Over Temperature, Reverse Polarity, Short Circuit

Substitute Part Grouping Explanation

Substitution of the LM2936MPX-5.0 is determined by the following critical parameters: fixed 5V output voltage, SOT-223-4 package compatibility, surface mount mounting type, and protection feature set. Substitute parts are grouped into two categories:

Parametric Equivalents (Texas Instruments LM2936 Series): Parts that maintain identical electrical specifications and are direct replacements with the same base product number but different packaging or product status designations.

Manufacturer Recommended Alternatives: Parts from alternative manufacturers (STMicroelectronics, onsemi, Infineon Technologies) that provide 5V fixed output in SOT-223 packaging with compatible protection features. These alternatives may differ in output current capability, quiescent current, PSRR, or maximum input voltage while remaining functionally compatible for applications within the LM2936MPX-5.0 current rating of 50mA.

Parameter Comparison

Part Number	Manufacturer	Output Current	Voltage Dropout (Max)	Input Voltage (Max)	Quiescent Current	PSRR	Operating Temp	Product Status	RoHS Status
LM2936MPX-5.0	Texas Instruments	50mA	0.4V @ 50mA	40V	9 µA	60dB (120Hz)	-40°C ~ 125°C	Obsolete	Non-compliant
LM2936MP-5.0/NOPB	Texas Instruments	50mA	0.4V @ 50mA	40V	9 µA	60dB (120Hz)	-40°C ~ 125°C	Active	ROHS3 Compliant
LM2936MPX-5.0/NOPB	Texas Instruments	50mA	0.4V @ 50mA	40V	9 µA	60dB (120Hz)	-40°C ~ 125°C	Active	ROHS3 Compliant
LM2936QMP-5.0/NOPB	Texas Instruments	50mA	0.4V @ 50mA	40V	9 µA	60dB (120Hz)	-40°C ~ 125°C	Active	ROHS3 Compliant
LM2936QMPX-5.0/NOPB	Texas Instruments	50mA	0.4V @ 50mA	40V	9 µA	60dB (120Hz)	-40°C ~ 125°C	Active	ROHS3 Compliant
L5150BNTR	STMicroelectronics	150mA	0.5V @ 150mA	40V	80 µA	48dB (100Hz)	-40°C ~ 150°C	Active	ROHS3 Compliant
NCV2931AST-5T3G	onsemi	100mA	0.6V @ 100mA	26V	1 mA	90dB (120Hz)	-40°C ~ 125°C	Active	ROHS3 Compliant
NCV8664CST50T3G	onsemi	150mA	0.6V @ 150mA	45V	29 µA	67dB (100Hz)	-40°C ~ 150°C	Active	ROHS3 Compliant
TLE42644GHTSA3	Infineon Technologies	100mA	0.5V @ 100mA	40V	60 µA	68dB (100Hz)	-40°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete LM2936MPX-5.0, the active Texas Instruments variants LM2936MP-5.0/NOPB, LM2936MPX-5.0/NOPB, LM2936QMP-5.0/NOPB, and LM2936QMPX-5.0/NOPB provide identical electrical performance with ROHS3 compliance. The automotive-qualified variants (LM2936QMP-5.0/NOPB and LM2936QMPX-5.0/NOPB) include AEC-Q100 certification and are suitable for automotive applications.

For applications requiring higher output current capacity beyond 50mA, the STMicroelectronics L5150BNTR (150mA), onsemi NCV8664CST50T3G (150mA), and Infineon TLE42644GHTSA3 (100mA) provide increased current capability while maintaining 5V fixed output and SOT-223 packaging. All recommended alternatives are ROHS3 compliant and AEC-Q100 qualified for automotive-grade applications.

The onsemi NCV2931AST-5T3G offers the highest PSRR (90dB) among alternatives but operates with a reduced maximum input voltage of 26V compared to the original 40V specification.

Frequently Asked Questions (FAQ)

Q: Can LM2936MP-5.0/NOPB directly replace LM2936MPX-5.0?

A: Yes. Both parts are Texas Instruments LM2936 series regulators with identical electrical specifications: 5V fixed output, 50mA output current, 0.4V dropout voltage, and -40°C to 125°C operating range. The primary difference is product status; LM2936MP-5.0/NOPB is active while the original is obsolete. The /NOPB suffix indicates lead-free and RoHS compliant packaging.

Q: What is the difference between LM2936QMP-5.0/NOPB and LM2936MPX-5.0/NOPB?

A: Both maintain identical electrical specifications. The "Q" designation in LM2936QMP-5.0/NOPB indicates automotive-grade qualification with AEC-Q100 certification, making it suitable for automotive applications. Packaging differs: LM2936QMP-5.0/NOPB uses Tape & Reel (TR) while LM2936MPX-5.0/NOPB uses Cut Tape (CT) & Digi-Reel®.

Q: Can I use L5150BNTR as a substitute if my application only requires 50mA?

A: Yes, with design considerations. The L5150BNTR provides 150mA output current, exceeding the 50mA requirement. However, it has a higher quiescent current (80 µA vs. 9 µA), lower PSRR (48dB vs. 60dB), and slightly higher dropout voltage (0.5V vs. 0.4V). These differences may impact power efficiency and noise performance in noise-sensitive applications.

Q: What is the maximum input voltage for NCV2931AST-5T3G?

A: The NCV2931AST-5T3G has a maximum input voltage of 26V, which is lower than the original LM2936MPX-5.0 (40V). This part is suitable only for applications with input voltages not exceeding 26V.

Q: Are all substitute parts available in SOT-223 packaging?

A: Yes. All substitute parts listed are available in SOT-223 or SOT-223-4 surface mount packaging, maintaining mechanical compatibility with the original LM2936MPX-5.0 footprint.

Q: Which substitute offers the best noise performance?

A: The onsemi NCV2931AST-5T3G provides the highest PSRR at 90dB (120Hz), offering superior power supply rejection ratio performance compared to the original 60dB specification. This makes it suitable for noise-sensitive applications.

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