LM2733YMFX Equivalent & Substitute Parts

Part Overview

The LM2733YMFX is a boost switching regulator IC from Texas Instruments designed for step-up voltage conversion applications. It delivers positive adjustable output from 2.7V to 40V with 1A switch current capability in a compact SC-74A (SOT-753) surface mount package. The device operates across an input voltage range of 2.7V to 14V and switches at 600kHz, making it suitable for portable power applications and battery charging circuits.

The LM2733YMFX is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for existing applications.

Key Parameters

Parameter	Value
Function	Step-Up (Boost)
Output Configuration	Positive
Output Type	Adjustable
Number of Outputs	1
Voltage - Input (Min)	2.7V
Voltage - Input (Max)	14V
Voltage - Output (Min/Fixed)	2.7V
Voltage - Output (Max)	40V (Switch)
Current - Output	1A (Switch)
Frequency - Switching	600kHz
Synchronous Rectifier	No
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5

Substitute Part Grouping Explanation

Substitution of the LM2733YMFX is determined by strict equivalence across the following critical parameters:

Function and topology (boost/step-up converter)
Output configuration (positive adjustable)
Input voltage range (2.7V to 14V minimum/maximum)
Output voltage range (2.7V to 40V minimum/maximum)
Output current capability (1A switch current)
Switching frequency (600kHz)
Package type (SC-74A, SOT-753 / SOT-23-5)
Operating temperature range (-40°C to 125°C)
Synchronous rectifier configuration (none)

The LM2733YMFX/NOPB is identified as a direct substitute based on identical electrical specifications and package compatibility. The primary distinction is product status and compliance certification.

Parameter Comparison

Parameter	LM2733YMFX	LM2733YMFX/NOPB
Manufacturer	Texas Instruments	Texas Instruments
Category	Power Management (PMIC)	Power Management (PMIC)
Function	Step-Up	Step-Up
Output Configuration	Positive	Positive
Topology	Boost	Boost
Output Type	Adjustable	Adjustable
Number of Outputs	1	1
Voltage - Input (Min)	2.7V	2.7V
Voltage - Input (Max)	14V	14V
Voltage - Output (Min/Fixed)	2.7V	2.7V
Voltage - Output (Max)	40V (Switch)	40V (Switch)
Current - Output	1A (Switch)	1A (Switch)
Frequency - Switching	600kHz	600kHz
Synchronous Rectifier	No	No
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount	Surface Mount
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753
Supplier Device Package	SOT-23-5	SOT-23-5
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99
HTSUS	8542.39.0001	8542.39.0001

Engineering Selection Recommendations

The LM2733YMFX/NOPB is the direct equivalent for the obsolete LM2733YMFX. Both parts share identical electrical and mechanical specifications, ensuring pin-for-pin and functional compatibility.

The primary advantage of selecting LM2733YMFX/NOPB is its active product status and ROHS3 compliance certification. The original LM2733YMFX is classified as obsolete and carries RoHS non-compliant status. For new designs or production continuity, LM2733YMFX/NOPB is the appropriate selection.

Both parts maintain identical moisture sensitivity level (MSL 1), REACH unaffected status, and export classification (EAR99), ensuring no additional compliance or handling requirements.

Frequently Asked Questions (FAQ)

Q: Can LM2733YMFX/NOPB be used as a direct replacement for LM2733YMFX?

A: Yes. The LM2733YMFX/NOPB is a direct substitute with identical electrical specifications, output voltage range (2.7V to 40V), output current (1A), switching frequency (600kHz), and SC-74A package configuration. No circuit modifications are required.

Q: What is the difference between LM2733YMFX and LM2733YMFX/NOPB?

A: The primary differences are product status and compliance certification. LM2733YMFX is obsolete and RoHS non-compliant, while LM2733YMFX/NOPB is active and ROHS3 compliant. Electrical and mechanical specifications are identical.

Q: Why is the original LM2733YMFX obsolete?

A: Product obsolescence is determined by the manufacturer. The LM2733YMFX/NOPB variant remains in active production and is the recommended selection for ongoing applications.

Q: Are there packaging differences between these parts?

A: No. Both parts use the SC-74A (SOT-753) surface mount package with SOT-23-5 supplier device package designation. Footprint and pin configuration are identical.

Q: What is the significance of the "/NOPB" suffix?

A: The "/NOPB" suffix indicates the part is supplied without plumbum (lead-free). This designation is associated with RoHS3 compliance and modern manufacturing standards.

Q: Can these parts be used in applications requiring RoHS compliance?

A: LM2733YMFX/NOPB is ROHS3 compliant and suitable for RoHS-regulated applications. The original LM2733YMFX is RoHS non-compliant and should not be used in applications with RoHS requirements.

Q: What is the operating temperature range for these regulators?

A: Both parts operate across -40°C to 125°C junction temperature (TJ), supporting industrial and extended temperature applications.

Q: Are moisture sensitivity precautions required for storage and handling?

A: Both parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. Standard component handling practices apply.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message