LM2936MPX-3.3 Equivalent & Substitute Parts

Part Overview

The LM2936MPX-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 3.3V output at 50mA in a SOT-223-4 surface mount package. The device is currently marked as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	3.3V
Output Current	50mA
Input Voltage (Max)	40V
Voltage Dropout (Max)	0.4V @ 50mA
Quiescent Current	15 µA
Package	SOT-223-4 (TO-261-4, TO-261AA)
Operating Temperature	-40°C ~ 125°C (TJ)
Protection Features	Over Temperature, Reverse Polarity, Short Circuit
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the LM2936MPX-3.3 is determined by the following critical parameters:

Primary Substitution Criteria:

Fixed output voltage of 3.3V
SOT-223-4 package compatibility (TO-261-4, TO-261AA)
Surface mount mounting type
Output current capability of 50mA or greater
Input voltage maximum of 40V or greater
Operating temperature range of -40°C to 125°C or wider

Substitute Categories:

Category 1: Direct Parametric Equivalents (Texas Instruments LM2936 Series) These parts maintain identical electrical specifications and package format. They differ only in product status (active vs. obsolete) and RoHS compliance:

LM2936MP-3.3/NOPB
LM2936MPX-3.3/NOPB
LM2936QMP-3.3/NOPB
LM2936QMPX-3.3/NOPB

Category 2: Manufacturer-Recommended Alternatives (onsemi) These parts provide higher output current capability in the same package, suitable for applications requiring additional current headroom:

NCV8664CST33T3G (150mA output)
NCV4274AST33T3G (400mA output)

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Operating Temp	Product Status	RoHS Status
LM2936MPX-3.3	Texas Instruments	3.3V	50mA	40V	0.4V @ 50mA	15 µA	SOT-223-4	-40°C ~ 125°C	Obsolete	Non-compliant
LM2936MP-3.3/NOPB	Texas Instruments	3.3V	50mA	40V	0.4V @ 50mA	15 µA	SOT-223-4	-40°C ~ 125°C	Active	ROHS3 Compliant
LM2936MPX-3.3/NOPB	Texas Instruments	3.3V	50mA	40V	0.4V @ 50mA	15 µA	SOT-223-4	-40°C ~ 125°C	Active	ROHS3 Compliant
LM2936QMP-3.3/NOPB	Texas Instruments	3.3V	50mA	40V	0.4V @ 50mA	15 µA	SOT-223-4	-40°C ~ 125°C	Active	ROHS3 Compliant
LM2936QMPX-3.3/NOPB	Texas Instruments	3.3V	50mA	40V	0.4V @ 50mA	15 µA	SOT-223-4	-40°C ~ 125°C	Active	ROHS3 Compliant
NCV8664CST33T3G	onsemi	3.3V	150mA	45V	Not specified	29 µA	SOT-223	-40°C ~ 150°C	Active	ROHS3 Compliant
NCV4274AST33T3G	onsemi	3.3V	400mA	40V	1.27V @ 250mA	250 µA	SOT-223	-40°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select from the active Texas Instruments LM2936 series variants (LM2936MP-3.3/NOPB, LM2936MPX-3.3/NOPB, LM2936QMP-3.3/NOPB, or LM2936QMPX-3.3/NOPB). All maintain the original 50mA output current and electrical characteristics while offering ROHS3 compliance and active product status. The QMP and QMPX variants include AEC-Q100 automotive qualification.

For Higher Current Applications: The NCV8664CST33T3G (onsemi) provides 150mA output current in the same SOT-223 package with extended operating temperature range (-40°C to 150°C) and improved quiescent current performance (29 µA). The NCV4274AST33T3G offers 400mA output current for applications requiring significantly higher current delivery, though with increased dropout voltage (1.27V @ 250mA) and quiescent current (250 µA).

Compliance Considerations: All recommended active substitutes are ROHS3 compliant and AEC-Q100 qualified (automotive grade variants available). The original LM2936MPX-3.3 is RoHS non-compliant and obsolete; migration to an active equivalent is recommended for new designs and ongoing procurement.

Frequently Asked Questions (FAQ)

Q: Can I use LM2936QMP-3.3/NOPB as a direct replacement for LM2936MPX-3.3? A: Yes. Both parts deliver identical electrical performance: 3.3V fixed output, 50mA current, 0.4V dropout voltage, and operate across -40°C to 125°C. The QMP variant includes AEC-Q100 automotive qualification and ROHS3 compliance, making it suitable for direct substitution.

Q: What is the difference between LM2936MP-3.3/NOPB and LM2936MPX-3.3/NOPB? A: Both are active Texas Instruments equivalents with identical electrical specifications. The primary difference is packaging: MP-3.3/NOPB is supplied in Cut Tape (CT) & Digi-Reel format, while MPX-3.3/NOPB is also available in Cut Tape & Digi-Reel. Electrical performance is identical.

Q: Can I substitute NCV8664CST33T3G for the LM2936MPX-3.3? A: Yes, with considerations. The NCV8664CST33T3G maintains 3.3V output and SOT-223 package compatibility but increases output current to 150mA and extends operating temperature to 150°C. Quiescent current rises to 29 µA. Use this substitute when higher current capability is beneficial or required.

Q: Is the NCV4274AST33T3G suitable for my application? A: The NCV4274AST33T3G is compatible in package and output voltage (3.3V, SOT-223) but delivers 400mA output current. However, dropout voltage increases to 1.27V @ 250mA and quiescent current to 250 µA. Select this part only if your application requires the higher current capability and can tolerate increased dropout voltage and quiescent current.

Q: Are all substitute parts AEC-Q100 qualified? A: The Texas Instruments QMP and QMPX variants (LM2936QMP-3.3/NOPB, LM2936QMPX-3.3/NOPB) include AEC-Q100 automotive qualification. The onsemi parts (NCV8664CST33T3G, NCV4274AST33T3G) are also AEC-Q100 qualified. The MP and MPX variants without the Q designation do not carry automotive qualification.

Q: What is the moisture sensitivity level (MSL) for these parts? A: Texas Instruments LM2936 series parts have MSL 1 (Unlimited). onsemi NCV8664CST33T3G and NCV4274AST33T3G have MSL 3 (168 Hours), requiring controlled storage and handling conditions.

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