LM3489MM/NOPB Equivalent & Substitute Parts

Part Overview

The LM3489MM/NOPB is a Buck Regulator Positive Output Step-Down DC-DC Controller IC manufactured by Texas Instruments in an 8-VSSOP package. This device functions as a transistor driver for step-down topology applications with a single output phase and input voltage range of 4.5V to 35V. The part is currently in Active product status with AEC-Q100 automotive qualification. Substitute parts are necessary when the primary part reaches end-of-life status, inventory constraints occur, or when design flexibility is required across manufacturing batches while maintaining electrical and mechanical compatibility.

Substiute Parts

LM3489MM/NOPB

Texas InstrumentsIn Stock: 15798LM3489MM/NOPB Datasheet

Current PartRFQ

LM3485MM/NOPB

Texas InstrumentsIn Stock: 96499LM3485MM/NOPB Datasheet

Parametric EquivalentRFQ

LM3485MMX/NOPB

Texas InstrumentsIn Stock: 55138LM3485MMX/NOPB Datasheet

Parametric EquivalentRFQ

LM3485Q1MM/NOPB

Texas InstrumentsIn Stock: 2156LM3485Q1MM/NOPB Datasheet

Parametric EquivalentRFQ

LM3489MM

Texas InstrumentsIn Stock: 2399LM3489MM Datasheet

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LM3489QMM/NOPB

Texas InstrumentsIn Stock: 10741LM3489QMM/NOPB Datasheet

Parametric EquivalentRFQ

LM3489QMMX/NOPB

Texas InstrumentsIn Stock: 3129LM3489QMMX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM3489MM/NOPB are determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Function: Step-Down (Buck) topology
• Output Type: Transistor Driver
• Output Configuration: Positive
• Number of Outputs: 1
• Output Phases: 1
• Voltage - Supply (Vcc/Vdd): 4.5V ~ 35V
• Duty Cycle (Max): 100%
• Synchronous Rectifier: No
• Clock Sync: No
• Operating Temperature: -40°C ~ 125°C (TJ)

Mechanical Equivalence Criteria:

• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Supplier Device Package: 8-VSSOP
• Mounting Type: Surface Mount

Compliance Criteria:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• Grade: Automotive
• Qualification: AEC-Q100

Substitute parts within the LM3489 series (LM3489MM, LM3489QMM/NOPB, LM3489QMMX/NOPB) maintain full electrical and mechanical compatibility. Parts from the LM3485 series (LM3485MM/NOPB, LM3485MMX/NOPB, LM3485Q1MM/NOPB) are parametric equivalents that share the same supply voltage range, package, and topology but may differ in control features and switching frequency specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Full Compatibility): LM3489QMM/NOPB and LM3489QMMX/NOPB are direct substitutes with identical electrical specifications, control features, and switching frequency. Both maintain Active product status and AEC-Q100 automotive qualification. Selection between these variants depends on packaging preference: QMM/NOPB is supplied in Tape & Reel format, while QMMX/NOPB is supplied in Cut Tape & Digi-Reel format.

Secondary Substitutes (Parametric Equivalents): LM3485MM/NOPB, LM3485MMX/NOPB, and LM3485Q1MM/NOPB share the same supply voltage range, package footprint, and topology. These parts are suitable for applications where control features and switching frequency specifications do not impose design constraints. LM3485Q1MM/NOPB carries automotive qualification (AEC-Q100), making it appropriate for automotive applications. LM3485MM/NOPB and LM3485MMX/NOPB lack automotive qualification and should be evaluated for non-automotive or less stringent applications.

Inventory Considerations: LM3485MM/NOPB offers the highest inventory availability (96400 pcs), followed by LM3485MMX/NOPB (55100 pcs). LM3489QMM/NOPB (10684 pcs) and LM3489QMMX/NOPB (3060 pcs) provide direct electrical equivalents with lower stock levels. LM3489MM is designated Last Time Buy status and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can LM3485 series parts replace LM3489MM/NOPB in all applications? A: LM3485 series parts are parametric equivalents that maintain the same supply voltage range (4.5V ~ 35V), package (8-TSSOP, 8-MSOP), and topology (buck step-down). However, they do not include the Current Limit and Enable control features specified for LM3489MM/NOPB. Applications requiring these control features must use LM3489 series parts. LM3485MM/NOPB and LM3485MMX/NOPB lack automotive qualification and should not be used in automotive designs.

Q: What is the difference between Cut Tape and Tape & Reel packaging? A: Both packaging formats contain the same 8-VSSOP component in an 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) package. Cut Tape (CT) & Digi-Reel format is suitable for manual assembly and smaller production runs. Tape & Reel (TR) format is optimized for automated pick-and-place assembly in high-volume manufacturing. Electrical and mechanical specifications are identical between packaging formats.

Q: Are all substitute parts RoHS3 compliant? A: All listed substitute parts are ROHS3 Compliant with Moisture Sensitivity Level (MSL) 1 (Unlimited). This ensures compatibility with lead-free soldering processes and unrestricted shelf life storage conditions.

Q: Which substitute part should be selected for automotive applications? A: For automotive applications, select from LM3489QMM/NOPB, LM3489QMMX/NOPB, LM3489MM, or LM3485Q1MM/NOPB. All four parts carry AEC-Q100 automotive qualification and Automotive grade designation. LM3489MM is Last Time Buy status and should not be selected for new designs. LM3489QMM/NOPB and LM3489QMMX/NOPB are preferred for new automotive designs due to Active product status.

Q: What is the significance of the switching frequency specification? A: LM3489 series parts specify switching frequency up to 1MHz, while LM3485 series parts do not provide this specification. Applications with specific switching frequency requirements must use LM3489 series parts. For applications without switching frequency constraints, LM3485 series parts are acceptable parametric equivalents.