LM3544MX-L Equivalent & Substitute Parts

Part Overview

The LM3544MX-L is a Power Management Integrated Circuit (PMIC) functioning as a USB Switch with N-Channel output configuration. This device operates as a 1:2 power switch/driver rated for 500mA maximum output current across four outputs in a high-side configuration. The main part number LM3544MX-L is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production requirements.

Substiute Parts

LM3544MX-L

Texas InstrumentsIn Stock: 3979LM3544MX-L Datasheet

Current PartRFQ

LM3544MX-L/NOPB

Texas InstrumentsIn Stock: 5159LM3544MX-L/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM3544MX-L is determined by strict equivalence across the following critical parameters:

• Switch Type: USB Switch
• Output Configuration: High Side, N-Channel, 4 outputs
• Input:Output Ratio: 1:2
• Electrical Performance: 500mA maximum output current, 90mOhm typical on-resistance
• Load Voltage Range: 2.7V ~ 5.5V
• Interface: On/Off control with Non-Inverting input
• Protection Features: Current Limiting (Fixed), Over Temperature, UVLO
• Package: 16-SOIC surface mount form factor

The LM3544MX-L/NOPB represents the direct equivalent part, maintaining identical electrical specifications and functional characteristics while differing in product status and packaging configuration.

Parameter Comparison

Engineering Selection Recommendations

The LM3544MX-L is classified as obsolete, while LM3544MX-L/NOPB maintains active product status from Texas Instruments. Both parts are electrically and functionally identical across all specified parameters. The primary distinction lies in product lifecycle status and regulatory compliance.

LM3544MX-L/NOPB is ROHS3 compliant, whereas the original LM3544MX-L is RoHS non-compliant. For new designs and production environments subject to RoHS regulations, LM3544MX-L/NOPB is the appropriate selection. The packaging difference (Tape & Reel versus bulk) reflects standard distribution practices for active versus obsolete inventory.

Both parts maintain identical electrical performance: 500mA output current capacity, 90mOhm on-resistance, 2.7V to 5.5V load voltage range, and comprehensive fault protection including current limiting, over-temperature shutdown, and under-voltage lockout.

Frequently Asked Questions (FAQ)

Q: Can LM3544MX-L/NOPB directly replace LM3544MX-L in existing designs?

A: Yes. Both parts are electrically and functionally identical. The LM3544MX-L/NOPB operates with identical electrical specifications, output characteristics, and protection features. The primary difference is product status and RoHS compliance level.

Q: What is the significance of the "/NOPB" suffix?

A: The "/NOPB" designation indicates the part is supplied in Tape & Reel packaging without plumbum (lead-free), reflecting standard distribution and compliance practices for active product lines.

Q: Are there package compatibility concerns when substituting these parts?

A: No. Both parts use the identical 16-SOIC (0.154", 3.90mm Width) surface mount package. PCB footprints and assembly processes require no modification.

Q: Why is the original LM3544MX-L classified as obsolete?

A: Product obsolescence reflects Texas Instruments' lifecycle management. The LM3544MX-L/NOPB represents the active equivalent and is the recommended part for procurement and new designs.

Q: What are the key electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by: USB Switch topology, 1:2 input:output ratio, 4 high-side N-Channel outputs, 500mA maximum current, 90mOhm on-resistance, 2.7V to 5.5V load voltage range, and identical fault protection features (current limiting, over-temperature, UVLO).