LM3497M/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM3497M/NOPB is an AC DC offline switcher LED driver IC manufactured by Texas Instruments, designed for lighting applications with Triac dimming capability. This Surface Mount device operates within a supply voltage range of 8V to 12V and features a Step-Down (Buck) topology in a 14-SOIC package. The part is currently Active in product status with ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts become necessary when the primary part experiences supply constraints, inventory limitations, or when design requirements necessitate alternative packaging formats or electrical specifications within the allowed parameter range for LED driver offline switcher applications.

Substiute Parts

LM3497M/NOPB

Texas InstrumentsIn Stock: 876LM3497M/NOPB Datasheet

Current PartRFQ

LM3497MX/NOPB

Texas InstrumentsIn Stock: 98909LM3497MX/NOPB Datasheet

Parametric EquivalentRFQ

HV9921N8-G

Microchip TechnologyIn Stock: 10112HV9921N8-G Datasheet

MFR RecommendedRFQ

MP4030GS

Monolithic Power Systems Inc.In Stock: 2374MP4030GS Datasheet

MFR RecommendedRFQ

RT8402GJ6

Richtek USA Inc.In Stock: 3650RT8402GJ6 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM3497M/NOPB is determined by the following critical parameters:

Primary Substitution Criteria:

• Category: Power Management (PMIC)
• Type: AC DC Offline Switcher
• Dimming: Triac
• Applications: Lighting
• RoHS Status: ROHS3 Compliant
• Number of Outputs: 1

Secondary Compatibility Parameters:

• Topology: Step-Down (Buck) or Flyback
• Voltage - Supply range overlap with 8V-12V minimum requirement
• Mounting Type: Surface Mount
• Operating Temperature range compatibility

Substitute parts are grouped into two categories: parametric equivalents (identical electrical and mechanical specifications with different packaging) and manufacturer-recommended alternatives (functionally equivalent with allowable parameter variations within the LED driver offline switcher classification).

Parameter Comparison

Engineering Selection Recommendations

LM3497MX/NOPB (Parametric Equivalent) This part is a direct parametric equivalent to the LM3497M/NOPB, differing only in packaging format (Tape & Reel versus Tube). Both parts share identical electrical specifications, topology, and operating parameters. Selection of this substitute is appropriate when Tape & Reel packaging is preferred for automated assembly processes. Product status is Active with ROHS3 compliance and unlimited moisture sensitivity rating.

HV9921N8-G (Manufacturer-Recommended Alternative) This Microchip Technology part functions as an AC DC offline switcher with Triac dimming for lighting applications. The supply voltage range (20V-400V) extends beyond the primary part's specification, providing broader input compatibility. Operating temperature is rated to 85°C ambient, which is lower than the primary part's 125°C junction rating. Package format is SOT-89-3, requiring PCB layout modifications. Product status is Active with ROHS3 compliance.

MP4030GS (Manufacturer-Recommended Alternative) This Monolithic Power Systems part employs a Flyback topology instead of Step-Down, suitable for applications where isolation or different power transfer characteristics are acceptable. Supply voltage range (11V-27V) overlaps with the primary part's minimum specification. Operating temperature is rated to 125°C junction, matching the primary part. Package format is 8-SOIC, requiring PCB layout modifications. Product status is Active with ROHS3 compliance and 1-year moisture sensitivity rating.

RT8402GJ6 (Not Recommended for New Designs) This Richtek part is classified as Obsolete and should not be selected for new designs. Although it meets the AC DC offline switcher and Triac dimming criteria, its discontinued status creates long-term supply and support risks. Operating temperature is limited to 85°C ambient. Package format is SOT-23-6. Moisture sensitivity level is 3 (168 hours), indicating higher sensitivity than the primary part.

Frequently Asked Questions (FAQ)

Q: Can LM3497MX/NOPB be used as a direct replacement for LM3497M/NOPB? A: Yes. Both parts are parametrically identical with the same electrical specifications, topology, and operating range. The only difference is packaging format: LM3497MX/NOPB uses Tape & Reel while LM3497M/NOPB uses Tube. No circuit modifications are required.

Q: What are the key differences between the LM3497M/NOPB and HV9921N8-G? A: The HV9921N8-G accepts a wider input voltage range (20V-400V) compared to the LM3497M/NOPB (8V-12V), making it suitable for higher voltage applications. However, it operates at a lower maximum ambient temperature (85°C versus 125°C junction). The package format differs (SOT-89-3 versus 14-SOIC), requiring PCB redesign.

Q: Is the MP4030GS a suitable substitute if my application requires the same supply voltage range? A: The MP4030GS supply range (11V-27V) overlaps with the LM3497M/NOPB minimum specification of 8V. If your application operates above 11V, the MP4030GS is compatible. The primary difference is topology: MP4030GS uses Flyback instead of Step-Down (Buck). Verify that your application design accommodates Flyback topology before substitution.

Q: Why is RT8402GJ6 listed if it is Obsolete? A: RT8402GJ6 is included for reference in existing designs that currently use this part. For new designs, Active status parts (LM3497MX/NOPB, HV9921N8-G, or MP4030GS) are recommended to ensure long-term availability and manufacturer support.

Q: Do all substitute parts maintain ROHS3 compliance? A: Yes. All listed substitute parts are ROHS3 compliant, matching the primary part's environmental compliance status.

Q: What packaging considerations should I account for when switching to HV9921N8-G or MP4030GS? A: Both alternatives require PCB layout modifications due to different package formats. HV9921N8-G uses SOT-89-3 (3-pin) while MP4030GS uses 8-SOIC. Verify pin assignments, thermal management requirements, and PCB trace routing before implementation.