LM3595LD/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM3595LD/NOPB is a 4-output linear LED driver IC manufactured by Texas Instruments, designed for backlight applications with analog and PWM dimming capabilities. The device operates from a 3V to 5.5V supply and delivers 24.5mA per output channel in a compact 10-WSON (3x3) package.

This part is classified as obsolete, making it necessary to identify functionally equivalent alternatives for new designs and ongoing production support. Substitute parts must maintain compatibility with the core electrical specifications and application requirements while meeting current product availability and compliance standards.

Substiute Parts

LM3595LD/NOPB

Texas InstrumentsIn Stock: 1153LM3595LD/NOPB Datasheet

Current PartRFQ

A6262KLPTR-T

Allegro MicroSystemsIn Stock: 803A6262KLPTR-T Datasheet

MFR RecommendedRFQ

A6264KLPTR-T

Allegro MicroSystemsIn Stock: 4448A6264KLPTR-T Datasheet

MFR RecommendedRFQ

BD1754HFN-TR

Rohm SemiconductorIn Stock: 5580BD1754HFN-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM3595LD/NOPB is determined by the following critical parameters:

• Number of Outputs: Must be 4 channels
• Supply Voltage Compatibility: Operating range must overlap or encompass the 3V to 5.5V requirement
• Output Current Capability: Minimum 24.5mA per channel
• Dimming Control: Must support PWM, analog, or multi-step dimming
• Package Type: Surface mount with exposed pad preferred for thermal performance
• Application Alignment: Backlight or lighting applications
• Compliance: RoHS3 compliance required

Two substitute parts meet these criteria with varying trade-offs in voltage range, current capacity, and dimming methodology.

Parameter Comparison

Engineering Selection Recommendations

A6262KLPTR-T (Allegro MicroSystems) is the primary recommended substitute. This part is actively manufactured and AEC-Q100 qualified for automotive applications. It provides 100mA per channel output current, exceeding the LM3595LD/NOPB requirement of 24.5mA. The extended supply voltage range (6V to 50V) accommodates higher voltage systems, though designs operating at 3V to 5.5V require voltage regulation or level shifting. PWM dimming is supported. The 16-eTSSOP package is larger than the original 10-WSON but offers improved thermal characteristics and wider industry availability.

A6264KLPTR-T (Allegro MicroSystems) is an alternative from the same manufacturer with identical electrical specifications to the A6262KLPTR-T. This part is actively produced with higher inventory availability (4396 units in stock versus 758 for the A6262KLPTR-T). Selection between A6262KLPTR-T and A6264KLPTR-T depends on internal switch requirements and specific application needs.

BD1754HFN-TR (Rohm Semiconductor) is a secondary option for designs requiring minimal voltage headroom and compact packaging. This part is classified as "Not For New Designs" and should be used only for legacy product support or maintenance applications. The 8-HSON package is smaller than the Allegro alternatives. Supply voltage range (2.7V to 5.5V) aligns closely with the original part. Output current of 32mA exceeds the 24.5mA requirement. Multi-step dimming differs from the analog/PWM control of the LM3595LD/NOPB, requiring firmware or control logic adaptation.

Frequently Asked Questions (FAQ)

Q: Can A6262KLPTR-T or A6264KLPTR-T be used directly as drop-in replacements?

A: No. The minimum supply voltage for both Allegro parts is 6V, while the LM3595LD/NOPB operates from 3V. Direct substitution requires either a boost converter to raise the 3V to 5.5V supply to 6V minimum, or redesign of the power distribution circuit. The 16-eTSSOP package also differs from the 10-WSON footprint, requiring PCB layout changes.

Q: What are the dimming control differences between substitutes?

A: The LM3595LD/NOPB supports both analog and PWM dimming. A6262KLPTR-T and A6264KLPTR-T support PWM dimming only. BD1754HFN-TR uses multi-step dimming, which requires discrete control signals rather than continuous analog or PWM inputs. Applications using analog dimming must be redesigned to use PWM control when substituting with Allegro parts.

Q: Is the higher current rating of substitute parts a concern?

A: No. A6262KLPTR-T and A6264KLPTR-T deliver 100mA per channel compared to 24.5mA for the LM3595LD/NOPB. This excess capacity provides design margin and does not create compatibility issues. Current limiting is determined by external resistors or firmware control in the application circuit.

Q: Why is BD1754HFN-TR marked "Not For New Designs"?

A: This designation indicates the part is in mature or declining production status. While suitable for legacy product maintenance, Rohm Semiconductor does not recommend it for new development. For new designs, A6262KLPTR-T or A6264KLPTR-T are preferred due to active production status and AEC-Q100 automotive qualification.

Q: What is the impact of different operating temperature ranges?

A: The LM3595LD/NOPB operates from -40°C to 85°C. A6262KLPTR-T and A6264KLPTR-T extend this to -40°C to 125°C, providing wider temperature margin. BD1754HFN-TR operates from -30°C to 85°C, which is narrower at the low end. For applications requiring -40°C operation, BD1754HFN-TR is not suitable.

Q: Are there package-related considerations for PCB redesign?

A: Yes. The LM3595LD/NOPB uses a 10-WSON (3x3) package. A6262KLPTR-T and A6264KLPTR-T use 16-eTSSOP, which is significantly larger. BD1754HFN-TR uses 8-PowerUDFN, which is smaller. PCB layout, thermal management, and component placement must be re-evaluated for each substitute. The Allegro parts require more board space but offer improved thermal performance through larger exposed pads.