LM2936MX-3.3 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM2936MX-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications with 50mA current capacity in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The LM2936MX-3.3 provides regulated 3.3V output with integrated protection features including over-temperature, reverse polarity, and short-circuit protection, suitable for low-power applications requiring stable voltage regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	50mA
Input Voltage (Max)	40V
Voltage Dropout (Max)	0.4V @ 50mA
Quiescent Current	15 µA
PSRR	60dB (120Hz)
Operating Temperature Range	-40°C ~ 125°C (TJ)
Package	8-SOIC (0.154", 3.90mm Width)
Protection Features	Over Temperature, Reverse Polarity, Short Circuit

Substitute Part Grouping Explanation

Substitution for the LM2936MX-3.3 is determined by strict equivalence across the following critical parameters:

Output voltage: 3.3V fixed
Output current capacity: 50mA
Input voltage rating: 40V maximum
Voltage dropout: 0.4V @ 50mA
Quiescent current: 15 µA
PSRR: 60dB (120Hz)
Operating temperature range: -40°C ~ 125°C
Package type: 8-SOIC surface mount
Protection features: Over temperature, reverse polarity, short circuit

Two substitute parts meet these electrical and mechanical specifications. The LM2936MX-3.3/NOPB is a direct manufacturer equivalent with identical electrical characteristics and active product status. The LM2936QMX-3.3/NOPB is a parametric equivalent with automotive-grade qualification (AEC-Q100) and identical electrical performance.

Parameter Comparison

Parameter	LM2936MX-3.3	LM2936MX-3.3/NOPB	LM2936QMX-3.3/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	3.3V	3.3V	3.3V
Output Current	50mA	50mA	50mA
Input Voltage (Max)	40V	40V	40V
Voltage Dropout (Max)	0.4V @ 50mA	0.4V @ 50mA	0.4V @ 50mA
Quiescent Current	15 µA	15 µA	15 µA
PSRR	60dB (120Hz)	60dB (120Hz)	60dB (120Hz)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Bulk	Tape & Reel (TR)	Tape & Reel (TR)
Automotive Grade	No	No	Yes (AEC-Q100)

Engineering Selection Recommendations

The LM2936MX-3.3/NOPB serves as the direct replacement for the obsolete LM2936MX-3.3. Both parts share identical electrical specifications and 8-SOIC packaging. The primary advantage of LM2936MX-3.3/NOPB is its active product status and ROHS3 compliance, addressing regulatory requirements for new designs.

The LM2936QMX-3.3/NOPB is selected for applications requiring automotive-grade components with AEC-Q100 qualification. This variant maintains all electrical parameters of the standard part while meeting automotive reliability and qualification standards. The automotive-grade designation indicates enhanced screening and testing protocols suitable for automotive and high-reliability applications.

Both substitute parts are available in Tape & Reel packaging, appropriate for automated assembly processes. Selection between LM2936MX-3.3/NOPB and LM2936QMX-3.3/NOPB depends on application requirements: standard industrial applications use the standard variant, while automotive or high-reliability applications use the AEC-Q100 qualified variant.

Frequently Asked Questions (FAQ)

Q: Can LM2936MX-3.3/NOPB directly replace the obsolete LM2936MX-3.3?

A: Yes. The LM2936MX-3.3/NOPB is electrically and mechanically identical to the LM2936MX-3.3, with the same 3.3V output, 50mA current capacity, 8-SOIC package, and all protection features. The primary differences are active product status and ROHS3 compliance.

Q: What is the difference between LM2936MX-3.3/NOPB and LM2936QMX-3.3/NOPB?

A: Both parts have identical electrical specifications and packaging. The LM2936QMX-3.3/NOPB includes automotive-grade qualification (AEC-Q100), indicating enhanced manufacturing controls and reliability testing suitable for automotive applications. Standard industrial applications use LM2936MX-3.3/NOPB; automotive applications use LM2936QMX-3.3/NOPB.

Q: Are the substitute parts available in the same package as the original?

A: Yes. All three parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package. The substitute parts are supplied in Tape & Reel packaging for automated assembly, while the original was supplied in bulk packaging.

Q: Do the substitute parts meet RoHS requirements?

A: Yes. Both LM2936MX-3.3/NOPB and LM2936QMX-3.3/NOPB are ROHS3 compliant. The original LM2936MX-3.3 is RoHS non-compliant, making the substitutes necessary for designs requiring RoHS compliance.

Q: What protection features are included in the substitute parts?

A: Both substitute parts include over-temperature, reverse polarity, and short-circuit protection, identical to the original LM2936MX-3.3.

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