LM2597MX-3.3 Equivalent & Substitute Parts

Part Overview

The LM2597MX-3.3 is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion with a fixed 3.3V output and 500mA current capacity. This component operates across a wide input voltage range of 4.5V to 40V and is housed in an 8-SOIC surface mount package.

The LM2597MX-3.3 carries an obsolete product status. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with active manufacturing support and current compliance certifications.

Substiute Parts

LM2597MX-3.3

Texas InstrumentsIn Stock: 2557LM2597MX-3.3 Datasheet

Current PartRFQ

LM2597MX-3.3/NOPB

Texas InstrumentsIn Stock: 3076LM2597MX-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2597MX-3.3 is determined by strict equivalence across the following critical parameters:

• Output voltage configuration (fixed 3.3V)
• Output current rating (500mA minimum)
• Input voltage operating range (4.5V to 40V)
• Switching topology (buck converter)
• Package form factor (8-SOIC with 0.154" width, 3.90mm)
• Operating temperature range (-40°C to 125°C)
• Mounting technology (surface mount)

Parts meeting these criteria are classified as direct equivalents. Packaging format differences (bulk versus tape & reel) do not affect electrical equivalence but may impact procurement and assembly workflows.

Parameter Comparison

Engineering Selection Recommendations

The LM2597MX-3.3/NOPB is the direct electrical equivalent of the LM2597MX-3.3. Both parts share identical electrical specifications, output characteristics, and package geometry. The primary distinction is product lifecycle status: the LM2597MX-3.3/NOPB maintains active manufacturing status with current supply chain availability.

For new designs or production continuity, the LM2597MX-3.3/NOPB is the appropriate selection. This part carries ROHS3 compliance certification, whereas the original LM2597MX-3.3 does not. The packaging format difference (tape & reel versus bulk) reflects standard distribution practices and does not affect circuit performance or PCB assembly compatibility.

Frequently Asked Questions (FAQ)

Q: Are the LM2597MX-3.3 and LM2597MX-3.3/NOPB electrically identical?

A: Yes. Both parts deliver identical electrical performance across all specified parameters: 3.3V fixed output, 500mA current capacity, 150kHz switching frequency, and 4.5V to 40V input range. The "/NOPB" suffix indicates lead-free (no-lead) plating and tape & reel packaging format.

Q: What does the obsolete status of the LM2597MX-3.3 mean for my design?

A: Obsolete status indicates the part is no longer in active production. Existing inventory may be available through secondary channels, but long-term supply cannot be guaranteed. Transitioning to the active LM2597MX-3.3/NOPB ensures reliable procurement for current and future production runs.

Q: Can I use the LM2597MX-3.3/NOPB as a direct replacement on existing PCBs designed for the LM2597MX-3.3?

A: Yes. Both parts use the identical 8-SOIC package footprint with matching pin assignments and electrical characteristics. No PCB redesign is required.

Q: What is the significance of ROHS3 compliance on the LM2597MX-3.3/NOPB?

A: ROHS3 compliance certifies the part meets current European Union Restriction of Hazardous Substances regulations. This is relevant for products destined for EU markets or applications subject to RoHS requirements. The original LM2597MX-3.3 does not carry this certification.

Q: Does the tape & reel packaging of the LM2597MX-3.3/NOPB affect circuit performance?

A: No. Packaging format (tape & reel versus bulk) is a procurement and assembly consideration only. It does not influence electrical performance, thermal characteristics, or reliability.