FAN5611MPX LED Driver IC Equivalent & Substitute Parts

Part Overview

The FAN5611MPX is a linear LED driver IC manufactured by onsemi, designed for 4-output backlight applications with analog and PWM dimming capabilities. This device features 40mA per-channel output current in a compact 6-MicroFET (2x2) surface mount package. The FAN5611MPX is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity.

Substiute Parts

FAN5611MPX

onsemiIn Stock: 968FAN5611MPX Datasheet

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A6261ELPTR-T

Allegro MicroSystemsIn Stock: 877A6261ELPTR-T Datasheet

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TPS75105YFFR

Texas InstrumentsIn Stock: 30194TPS75105YFFR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FAN5611MPX are selected based on the following critical parameters that define functional equivalence:

• Number of Outputs: Must be 4 channels
• Type: Linear LED driver topology
• Dimming Support: Must support PWM dimming (analog dimming is optional)
• Operating Temperature Range: Must cover -40°C to 85°C
• Internal Switching: Must include integrated output switches
• Supply Voltage Compatibility: Must operate within or encompass the 3.3V to 5.5V range
• Current Capability: Must support minimum 40mA per channel output current
• Mounting: Surface mount technology
• Applications: LED backlight driver functionality

The two identified substitute parts meet these core functional requirements while offering different trade-offs in package size, current capacity, and supply voltage range.

Parameter Comparison

Engineering Selection Recommendations

A6261ELPTR-T (Allegro MicroSystems)

This substitute offers higher current capacity (100mA per channel) and extended supply voltage range (6V to 50V), making it suitable for applications requiring greater output current or higher supply voltages. The 16-TSSOP package is larger than the original 6-WDFN, requiring PCB layout modification. This part is active and ROHS3 compliant. The minimum supply voltage of 6V exceeds the FAN5611MPX lower limit, requiring circuit redesign for applications operating below 6V.

TPS75105YFFR (Texas Instruments)

This substitute provides the closest supply voltage compatibility (2.7V to 5.5V), encompassing the original 3.3V to 5.5V range. Output current per channel is 25mA, which is lower than the FAN5611MPX 40mA specification. The 9-DSBGA package is compact and suitable for space-constrained designs. This part is active, ROHS3 compliant, and carries MSL rating 1 (Unlimited). Applications requiring full 40mA per channel output current may require circuit modifications or parallel channel configuration.

Frequently Asked Questions (FAQ)

Q: Can the A6261ELPTR-T directly replace the FAN5611MPX without PCB modifications?

A: No. The A6261ELPTR-T uses a 16-TSSOP package versus the original 6-WDFN package, requiring PCB layout redesign. Additionally, the minimum supply voltage is 6V, which may not be compatible with 3.3V supply designs.

Q: Is the TPS75105YFFR suitable for applications requiring 40mA per channel output?

A: The TPS75105YFFR is rated for 25mA per channel. Applications requiring 40mA per channel output current must either accept reduced brightness or implement parallel channel configuration if the application topology permits.

Q: What is the primary advantage of using TPS75105YFFR over A6261ELPTR-T?

A: The TPS75105YFFR maintains supply voltage compatibility with the original FAN5611MPX (2.7V to 5.5V range) and offers a more compact 9-DSBGA package. It requires no supply voltage circuit redesign for existing 3.3V to 5.5V applications.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both A6261ELPTR-T and TPS75105YFFR are ROHS3 compliant. The original FAN5611MPX RoHS status is not specified in available documentation.

Q: What is the moisture sensitivity difference between these parts?

A: The FAN5611MPX and TPS75105YFFR both carry MSL rating 1 (Unlimited moisture sensitivity). The A6261ELPTR-T carries MSL rating 2 (1 Year), requiring stricter moisture control during storage and handling.

Q: Can both substitutes support PWM dimming like the original part?

A: Yes. Both A6261ELPTR-T and TPS75105YFFR support PWM dimming. The original FAN5611MPX also supports analog dimming, which is not available in either substitute.