LM5116MHX Equivalent & Substitute Parts

Part Overview

The LM5116MHX is a buck regulator positive output step-down DC-DC controller IC manufactured by Texas Instruments. This power management IC operates as a transistor driver with a single output phase, designed for applications requiring step-down voltage conversion from 6V to 100V supply rails. The device is classified as Last Time Buy, indicating discontinued production with limited availability. Identifying equivalent substitute parts is necessary to ensure design continuity and secure component supply for ongoing production and maintenance requirements.

Substiute Parts

LM5116MHX

Texas InstrumentsIn Stock: 18965LM5116MHX Datasheet

Current PartRFQ

LM5116MHX/NOPB

Texas InstrumentsIn Stock: 45431LM5116MHX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM5116MHX is determined by strict equivalence across the following critical parameters:

• Identical output topology (buck, positive output, single phase)
• Matching supply voltage range (6V ~ 100V)
• Identical switching frequency options (200kHz, 535kHz)
• Presence of synchronous rectifier and clock sync capabilities
• Identical control feature set (Enable, Frequency Control, Ramp, Soft Start)
• Matching operating temperature range (-40°C ~ 125°C)
• Identical package specification (20-PowerTSSOP / 20-HTSSOP)
• Equivalent regulatory compliance (ROHS3, REACH Unaffected)

The LM5116MHX/NOPB qualifies as a parametric equivalent substitute, sharing all electrical and mechanical specifications with the main part number while differing only in lead finish designation (NOPB indicates lead-free, tin plating).

Parameter Comparison

Engineering Selection Recommendations

The LM5116MHX/NOPB is a direct parametric equivalent to the LM5116MHX. Both parts maintain identical electrical specifications, control features, and package configurations. The primary distinction is product status: the LM5116MHX is designated Last Time Buy with limited inventory (18,875 pcs), while the LM5116MHX/NOPB maintains Active status with significantly higher availability (45,400 pcs).

For new designs and ongoing production requiring long-term component supply, the LM5116MHX/NOPB is the appropriate selection. Both parts satisfy ROHS3 compliance and REACH requirements, ensuring regulatory alignment for current manufacturing standards. The lead-free finish (NOPB designation) of the substitute part aligns with modern soldering processes and environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can LM5116MHX/NOPB be used as a direct replacement for LM5116MHX?

A: Yes. The LM5116MHX/NOPB is a parametric equivalent with identical electrical and mechanical specifications. The NOPB designation indicates lead-free plating, which is compatible with standard lead-free soldering processes.

Q: What is the difference between LM5116MHX and LM5116MHX/NOPB?

A: The parts are electrically and functionally identical. The difference is in lead finish: LM5116MHX uses standard lead plating, while LM5116MHX/NOPB uses lead-free tin plating. Product status also differs, with LM5116MHX/NOPB in Active production.

Q: Why is LM5116MHX marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued this specific part number variant. The LM5116MHX/NOPB remains in active production and serves as the current equivalent.

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

A: No. Both parts use the identical 20-PowerTSSOP (20-HTSSOP) package with the same pinout, footprint, and mechanical dimensions (0.173", 4.40mm width).

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. Identical package specifications, pinout, and electrical characteristics allow direct PCB assembly interchange without design modifications.

Q: What are the key parameters that define substitution eligibility?

A: Substitution is based on matching output topology (buck, positive, single phase), supply voltage range (6V ~ 100V), switching frequencies (200kHz, 535kHz), control features (Enable, Frequency Control, Ramp, Soft Start), operating temperature range (-40°C ~ 125°C), package type (20-PowerTSSOP), and regulatory compliance (ROHS3, REACH Unaffected).