LM5574MT Equivalent & Substitute Parts

Part Overview

The LM5574MT is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion with positive adjustable output. It delivers 500mA output current across an input voltage range of 6V to 75V, with adjustable output voltage from 1.225V to 70V. The device operates at switching frequencies between 50kHz and 500kHz and is housed in a 16-TSSOP surface mount package.

The LM5574MT carries a Last Time Buy product status, indicating discontinued production. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently using this component.

Substiute Parts

LM5574MT

Texas InstrumentsIn Stock: 35133LM5574MT Datasheet

Current PartRFQ

LM5574MT/NOPB

Texas InstrumentsIn Stock: 2053LM5574MT/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM5574MT is determined by strict equivalence across the following critical parameters:

• Topology: Buck (step-down) switching regulator
• Output configuration: Positive adjustable voltage
• Output current rating: 500mA
• Input voltage range: 6V to 75V minimum/maximum
• Adjustable output voltage range: 1.225V to 70V
• Package type: 16-TSSOP surface mount
• Operating temperature range: -40°C to 125°C
• Switching frequency range: 50kHz to 500kHz

Only parts meeting all these specifications qualify as direct substitutes. Deviations in any parameter require circuit redesign validation.

Parameter Comparison

Engineering Selection Recommendations

The LM5574MT/NOPB is the direct substitute for the LM5574MT. Both parts are identical in electrical specifications, package configuration, and functional performance. The primary distinction is product lifecycle status: the LM5574MT is Last Time Buy, while the LM5574MT/NOPB maintains Active status with current manufacturing availability.

The LM5574MT/NOPB carries ROHS3 compliance and REACH Unaffected certification, meeting regulatory requirements for industrial and commercial applications. The MSL rating of 1 (Unlimited) indicates no moisture sensitivity constraints during storage or handling.

For new designs or production transitions, the LM5574MT/NOPB is the recommended selection due to ongoing availability and active product support from Texas Instruments.

Frequently Asked Questions (FAQ)

Q: Can the LM5574MT/NOPB be used as a direct replacement for the LM5574MT?

A: Yes. Both parts are electrically and mechanically identical. The LM5574MT/NOPB is the active production variant with identical specifications across all critical parameters: output current, voltage ranges, switching frequency, package type, and operating temperature range.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix designates "No Plumbum" (lead-free) packaging, indicating RoHS3 compliance. This is a manufacturing and compliance designation; it does not affect electrical performance or pin compatibility.

Q: Are there any package or pinout differences between these parts?

A: No. Both parts use the 16-TSSOP (0.173", 4.40mm Width) surface mount package with identical pinout and footprint. PCB designs require no modification for substitution.

Q: Why is the LM5574MT marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued this part number in favor of the LM5574MT/NOPB variant. The LM5574MT/NOPB provides the same functionality with current manufacturing support.

Q: What is the inventory status for each part?

A: The LM5574MT has 35,100 pieces available as new original stock. The LM5574MT/NOPB has 2,031 pieces available as new original stock. For long-term supply assurance, the LM5574MT/NOPB is the preferred selection.

Q: Are there compliance or certification differences?

A: No. Both parts carry identical certifications: ROHS3 Compliant, REACH Unaffected, MSL 1 (Unlimited), ECCN EAR99, and HTSUS 8542.39.0001.