LM5020SD-1 Equivalent & Substitute Parts

Part Overview

The LM5020SD-1 is a Flyback Regulator Positive Output Step-Up/Step-Down DC-DC Controller IC in 10-WSON (4x4) packaging from Texas Instruments. This device functions as a transistor driver for single-output flyback topologies with integrated frequency control and soft start features. The main part number LM5020SD-1 carries an Obsolete product status. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this controller topology.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Type	Transistor Driver
Function	Step-Up/Step-Down
Output Configuration	Positive
Topology	Flyback
Number of Outputs	1
Voltage - Supply (Vcc/Vdd)	8V ~ 15V
Frequency - Switching	200kHz ~ 630kHz
Duty Cycle (Max)	80%
Package / Case	10-WDFN Exposed Pad
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C (TJ)
Control Features	Frequency Control, Soft Start

Substitute Part Grouping Explanation

Substitute parts for the LM5020SD-1 are determined by strict equivalence across the following critical parameters:

Identical base product number (LM5020)
Matching output type, function, and topology (Transistor Driver, Step-Up/Step-Down, Flyback)
Identical output configuration and number of outputs (Positive, 1 output)
Matching supply voltage range (8V ~ 15V)
Matching switching frequency range (200kHz ~ 630kHz)
Identical duty cycle maximum (80%)
Identical package and pinout (10-WDFN Exposed Pad, 10-WSON 4x4)
Matching control features (Frequency Control, Soft Start)
Identical operating temperature range (-40°C ~ 125°C)

The identified substitutes differ only in packaging format (Cut Tape vs. Tape & Reel) and product status (Active vs. Obsolete), with no functional or electrical parameter variations.

Parameter Comparison

Parameter	LM5020SD-1	LM5020SD-1/NOPB	LM5020SDX-1/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
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
Topology	Flyback	Flyback	Flyback
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)	80%	80%	80%
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
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Control Features	Frequency Control, Soft Start	Frequency Control, Soft Start	Frequency Control, Soft Start
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Standard	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

Both LM5020SD-1/NOPB and LM5020SDX-1/NOPB are direct functional equivalents to the obsolete LM5020SD-1. Selection between these substitutes is based on the following criteria:

LM5020SD-1/NOPB is suitable for applications requiring Cut Tape or Digi-Reel packaging formats and is ROHS3 compliant.

LM5020SDX-1/NOPB is suitable for applications requiring Tape & Reel packaging format and is ROHS3 compliant.

Both substitute parts carry Active product status, ensuring long-term availability and supply chain stability compared to the Obsolete main part number. Both substitutes meet ROHS3 compliance requirements, whereas the original LM5020SD-1 is RoHS non-compliant. Selection between the two substitutes depends solely on packaging and supply chain requirements for your manufacturing process.

Frequently Asked Questions (FAQ)

Q: Can LM5020SD-1/NOPB and LM5020SDX-1/NOPB be used interchangeably with LM5020SD-1?

A: Yes. All three part numbers are functionally identical across all electrical and mechanical parameters. The differences are limited to product status (Obsolete vs. Active) and packaging format (standard vs. Cut Tape vs. Tape & Reel).

Q: What is the primary reason to substitute the LM5020SD-1?

A: The LM5020SD-1 carries an Obsolete product status. The Active substitutes LM5020SD-1/NOPB and LM5020SDX-1/NOPB ensure continued availability and supply chain reliability.

Q: Are there any electrical performance differences between these part numbers?

A: No. All three part numbers share identical electrical specifications including supply voltage range (8V ~ 15V), switching frequency range (200kHz ~ 630kHz), duty cycle maximum (80%), and control features (Frequency Control, Soft Start).

Q: What is the difference between LM5020SD-1/NOPB and LM5020SDX-1/NOPB?

A: The primary difference is packaging format. LM5020SD-1/NOPB is supplied in Cut Tape (CT) & Digi-Reel format, while LM5020SDX-1/NOPB is supplied in Tape & Reel (TR) format. Both are ROHS3 compliant and functionally equivalent.

Q: Is the package pinout identical across all three part numbers?

A: Yes. All three part numbers use the 10-WDFN Exposed Pad package with 10-WSON (4x4) pinout configuration. PCB layout and schematic connections remain unchanged.

Q: What compliance improvements do the substitute parts offer?

A: Both LM5020SD-1/NOPB and LM5020SDX-1/NOPB are ROHS3 compliant, whereas the original LM5020SD-1 is RoHS non-compliant. This provides improved environmental compliance for new designs and manufacturing processes.

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