LM5085MY/NOPB Equivalent & Substitute Parts

Part Overview

The LM5085MY/NOPB is a buck regulator positive output step-down DC-DC controller IC manufactured by Texas Instruments in an 8-HVSSOP package. This device functions as a transistor driver for step-down topology applications with a single output phase, supporting supply voltages from 4.5V to 75V and switching frequencies up to 1MHz. The part is classified as "Not For New Designs," indicating it has been superseded. Identifying equivalent and substitute parts is necessary for design continuity, inventory management, and ensuring long-term component availability for existing applications.

Substiute Parts

LM5085MY/NOPB

Texas InstrumentsIn Stock: 17200LM5085MY/NOPB Datasheet

Current PartRFQ

LM5085MYX/NOPB

Texas InstrumentsIn Stock: 30421LM5085MYX/NOPB Datasheet

DirectRFQ

TPS53125RGET

Texas InstrumentsIn Stock: 2319TPS53125RGET Datasheet

MFR RecommendedRFQ

LM5085MYE/NOPB

Texas InstrumentsIn Stock: 35997LM5085MYE/NOPB Datasheet

Parametric EquivalentRFQ

LM5085QMY/NOPB

Texas InstrumentsIn Stock: 6107LM5085QMY/NOPB Datasheet

Parametric EquivalentRFQ

LM5085QMYE/NOPB

Texas InstrumentsIn Stock: 2256LM5085QMYE/NOPB Datasheet

Parametric EquivalentRFQ

LM5085QMYX/NOPB

Texas InstrumentsIn Stock: 4184LM5085QMYX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM5085MY/NOPB are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalents (Same Package, Identical Electrical Parameters): These parts maintain the 8-HVSSOP package format and all core electrical specifications: 4.5V ~ 75V supply voltage, up to 1MHz switching frequency, 100% maximum duty cycle, single output phase, and identical control features (Current Limit, Enable, On Time Control). The primary differentiator is product status and packaging format (Cut Tape vs. Tape & Reel).

• LM5085MYX/NOPB (Active status, Cut Tape & Digi-Reel)
• LM5085MYE/NOPB (Not For New Designs, Tape & Reel)
• LM5085QMY/NOPB (Active status, Automotive grade, AEC-Q100 qualified)
• LM5085QMYE/NOPB (Active status, Automotive grade, AEC-Q100 qualified)
• LM5085QMYX/NOPB (Active status, Automotive grade, AEC-Q100 qualified)

Functional Alternative (Different Package, Reduced Electrical Scope): The TPS53125RGET operates as a functional alternative with different electrical parameters. It uses a 24-VQFN package, supports 4.5V ~ 24V supply voltage (narrower range), operates at 350kHz fixed frequency, includes synchronous rectifier capability, and supports dual output phases. This part is suitable only when the application can accommodate the reduced supply voltage range and different package footprint.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same PCB Layout, No Redesign):

Select LM5085MYX/NOPB as the primary direct substitute. This part maintains identical electrical specifications and package format while offering Active product status, ensuring long-term availability and manufacturing support. It is available in Cut Tape & Digi-Reel packaging with the highest inventory level (30400 units).

LM5085MYE/NOPB serves as a secondary direct equivalent with identical electrical parameters but carries "Not For New Designs" status. Use this part only when LM5085MYX/NOPB is unavailable.

For Automotive Applications:

If the application requires automotive-grade components with AEC-Q100 qualification, select LM5085QMY/NOPB, LM5085QMYE/NOPB, or LM5085QMYX/NOPB. All three maintain the 8-HVSSOP package and identical electrical specifications while meeting automotive qualification standards. LM5085QMY/NOPB offers the highest inventory among automotive variants (6050 units).

For Functional Alternative (Requires Design Modification):

The TPS53125RGET is suitable only when the application can accommodate a narrower supply voltage range (4.5V ~ 24V maximum versus 4.5V ~ 75V), a different package footprint (24-VQFN), and reduced control feature set (Enable only, versus Current Limit, Enable, On Time Control). This part includes synchronous rectifier capability and operates at a fixed 350kHz frequency. PCB redesign is required for package migration.

Frequently Asked Questions (FAQ)

Q: Can LM5085MYX/NOPB be used as a direct drop-in replacement for LM5085MY/NOPB?

A: Yes. LM5085MYX/NOPB is electrically and mechanically identical to LM5085MY/NOPB, maintaining the same 8-HVSSOP package, supply voltage range (4.5V ~ 75V), switching frequency capability (up to 1MHz), duty cycle (100%), and control features (Current Limit, Enable, On Time Control). No circuit modifications are required.

Q: What is the difference between LM5085MYX/NOPB and LM5085QMY/NOPB?

A: Both parts share identical electrical specifications and the 8-HVSSOP package. The primary difference is that LM5085QMY/NOPB is automotive-grade and AEC-Q100 qualified, making it suitable for automotive applications. LM5085MYX/NOPB is the industrial-grade variant. Select the automotive variant only if your application requires automotive qualification.

Q: Why is TPS53125RGET listed as a substitute if it has different electrical parameters?

A: TPS53125RGET is a functional alternative for applications that can accommodate design modifications. It operates within a narrower supply voltage range (4.5V ~ 24V) and uses a different package (24-VQFN). It is not a direct replacement and requires PCB redesign. Use this part only when the reduced voltage range and different package footprint are acceptable for your application.

Q: What does "Not For New Designs" status mean for LM5085MY/NOPB?

A: This status indicates the part has been superseded by newer alternatives. While existing inventory remains available, Texas Instruments does not recommend using this part for new designs. For new applications, select an Active-status equivalent such as LM5085MYX/NOPB or LM5085QMY/NOPB.

Q: Are all LM5085 variants compatible with the same PCB layout?

A: Yes. LM5085MY/NOPB, LM5085MYX/NOPB, LM5085MYE/NOPB, LM5085QMY/NOPB, LM5085QMYE/NOPB, and LM5085QMYX/NOPB all use the 8-HVSSOP package with identical pinout and electrical specifications. They are fully interchangeable without PCB modifications.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) & Digi-Reel packaging is suitable for manual assembly and smaller production volumes. Tape & Reel (TR) packaging is optimized for automated pick-and-place assembly in high-volume manufacturing. Both formats contain the same component; the difference is in handling and assembly method. Select based on your production process requirements.

Q: Can I use LM5085QMYX/NOPB in a non-automotive application?

A: Yes. LM5085QMYX/NOPB exceeds the requirements for industrial applications. It maintains identical electrical specifications to the industrial-grade variants while offering automotive-grade qualification. Using an automotive-qualified part in an industrial application introduces no compatibility issues.

Q: What is the Moisture Sensitivity Level (MSL) difference between LM5085 variants and TPS53125RGET?

A: LM5085 variants carry MSL 1 (Unlimited), meaning they have no moisture sensitivity restrictions and can be stored indefinitely without special handling. TPS53125RGET carries MSL 2 (1 Year), requiring controlled storage conditions and limiting shelf life to one year from the date of manufacture. This affects component handling, storage, and procurement planning.