LM5020SDX-2 Equivalent & Substitute Parts

Part Overview

The LM5020SDX-2 is a Flyback Regulator Positive Output Step-Up/Step-Down DC-DC Controller IC manufactured by Texas Instruments in a 10-WSON (4x4) package. This component functions as a transistor driver for single-output flyback topologies with integrated frequency control and soft start features.

The LM5020SDX-2 carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this controller.

Key Parameters

Parameter	Specification
Topology	Flyback
Output Type	Transistor Driver
Function	Step-Up/Step-Down
Output Configuration	Positive
Number of Outputs	1
Voltage - Supply (Vcc/Vdd)	8V ~ 15V
Frequency - Switching	200kHz ~ 630kHz
Duty Cycle (Max)	50%
Control Features	Frequency Control, Soft Start
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	10-WDFN Exposed Pad
Supplier Device Package	10-WSON (4x4)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the LM5020SDX-2 are identified based on strict electrical and mechanical parameter matching within the LM5020 product family. The substitution criteria are:

Electrical Parameters (Must Match):

Topology: Flyback
Output Type: Transistor Driver
Function: Step-Up/Step-Down
Output Configuration: Positive
Number of Outputs: 1
Voltage - Supply (Vcc/Vdd): 8V ~ 15V
Frequency - Switching: 200kHz ~ 630kHz
Duty Cycle (Max): 50%
Control Features: Frequency Control, Soft Start
Operating Temperature: -40°C ~ 125°C (TJ)

Mechanical Parameters (Must Match):

Package / Case: 10-WDFN Exposed Pad
Supplier Device Package: 10-WSON (4x4)
Mounting Type: Surface Mount

All identified substitutes maintain identical electrical and mechanical specifications, ensuring functional and physical compatibility within the same design footprint and operating envelope.

Parameter Comparison

Parameter	LM5020SDX-2	LM5020SDX-2/NOPB	LM5020SD-2/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Category	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)
Topology	Flyback	Flyback	Flyback
Output Type	Transistor Driver	Transistor Driver	Transistor Driver
Function	Step-Up/Step-Down	Step-Up/Step-Down	Step-Up/Step-Down
Output Configuration	Positive	Positive	Positive
Number of Outputs	1	1	1
Voltage - Supply (Vcc/Vdd)	8V ~ 15V	8V ~ 15V	8V ~ 15V
Frequency - Switching	200kHz ~ 630kHz	200kHz ~ 630kHz	200kHz ~ 630kHz
Duty Cycle (Max)	50%	50%	50%
Control Features	Frequency Control, Soft Start	Frequency Control, Soft Start	Frequency Control, Soft Start
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	10-WDFN Exposed Pad	10-WDFN Exposed Pad	10-WDFN Exposed Pad
Supplier Device Package	10-WSON (4x4)	10-WSON (4x4)	10-WSON (4x4)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both LM5020SDX-2/NOPB and LM5020SD-2/NOPB are suitable substitutes for the obsolete LM5020SDX-2 based on complete electrical and mechanical parameter equivalence.

LM5020SDX-2/NOPB is the direct manufacturer equivalent with Active product status and ROHS3 compliance. This part number includes the "/NOPB" suffix, indicating lead-free and halogen-free manufacturing per RoHS3 standards.

LM5020SD-2/NOPB is a parametric equivalent within the LM5020 family, also carrying Active product status and ROHS3 compliance. The "SD" package designation represents an alternative supplier device package variant while maintaining identical electrical performance and 10-WSON (4x4) physical compatibility.

Both substitutes provide improved compliance status compared to the obsolete original part, with current availability and active manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can LM5020SDX-2/NOPB and LM5020SD-2/NOPB be used interchangeably with LM5020SDX-2?

A: Yes. Both parts maintain identical electrical specifications (topology, output type, function, supply voltage, switching frequency, duty cycle, control features, and operating temperature) and mechanical specifications (10-WDFN Exposed Pad package, 10-WSON 4x4 footprint, surface mount). They are functionally and physically compatible within the same circuit design.

Q: What is the difference between LM5020SDX-2/NOPB and LM5020SD-2/NOPB?

A: Both parts are parametrically equivalent with identical electrical and mechanical specifications. The difference lies in the package designation suffix: "SDX" versus "SD" represent different supplier device package variants. Both are 10-WSON (4x4) packages suitable for the same PCB footprint.

Q: Why is the original LM5020SDX-2 marked as Obsolete?

A: The LM5020SDX-2 has reached end-of-life status. The active substitutes LM5020SDX-2/NOPB and LM5020SD-2/NOPB provide continued design support with improved RoHS3 compliance and current manufacturer availability.

Q: Are there any compliance differences between the original and substitute parts?

A: Yes. The original LM5020SDX-2 is RoHS non-compliant, while both substitutes (LM5020SDX-2/NOPB and LM5020SD-2/NOPB) are ROHS3 compliant. All three parts maintain identical REACH Unaffected and EAR99 ECCN status.

Q: Can I use these parts in new designs?

A: LM5020SDX-2/NOPB and LM5020SD-2/NOPB are recommended for new designs due to their Active product status, current availability, and RoHS3 compliance. The original LM5020SDX-2 should not be used in new designs given its Obsolete status.

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