LM2594N-3.3 Equivalent & Substitute Parts

Part Overview

The LM2594N-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. This device operates across a wide input voltage range of 4.5V to 40V and delivers up to 500mA output current, making it suitable for embedded systems, industrial equipment, and portable applications requiring regulated 3.3V power.

The LM2594N-3.3 carries an obsolete product status. Identifying equivalent substitute parts ensures design continuity, maintains supply chain reliability, and provides access to components with improved compliance certifications and active manufacturer support.

Substiute Parts

LM2594N-3.3

Texas InstrumentsIn Stock: 2126LM2594N-3.3 Datasheet

Current PartRFQ

LM2594N-3.3/NOPB

Texas InstrumentsIn Stock: 2239LM2594N-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2594N-3.3 is determined by strict equivalence across the following critical parameters:

• Functional Topology: Buck (step-down) switching regulator
• Output Voltage: Fixed 3.3V
• Output Current Rating: 500mA minimum
• Input Voltage Range: 4.5V to 40V
• Switching Frequency: 150kHz
• Package Type: 8-DIP (0.300", 7.62mm) through-hole
• Temperature Range: -40°C to 125°C (TJ)

Only components matching all these parameters across electrical and mechanical specifications qualify as direct substitutes. Packaging variants (such as tube versus bulk) do not affect functional equivalence but may impact procurement and handling procedures.

Parameter Comparison

Engineering Selection Recommendations

The LM2594N-3.3/NOPB is the direct functional equivalent of the LM2594N-3.3. Both components share identical electrical specifications, switching characteristics, and package geometry, ensuring pin-for-pin compatibility and circuit-level interchangeability.

The primary distinction between these parts is product lifecycle status and regulatory compliance. The LM2594N-3.3/NOPB maintains active product status with Texas Instruments and carries ROHS3 compliance certification, whereas the original LM2594N-3.3 is obsolete and RoHS non-compliant. For new designs or production runs requiring regulatory compliance with modern environmental standards, the LM2594N-3.3/NOPB is the appropriate selection. Both components maintain identical moisture sensitivity levels and REACH compliance status.

Frequently Asked Questions (FAQ)

Q: Can the LM2594N-3.3/NOPB be used as a direct replacement for the LM2594N-3.3?

A: Yes. Both components are electrically and mechanically identical across all functional parameters, including input/output voltage ranges, current rating, switching frequency, operating temperature, and 8-DIP package configuration. They are pin-for-pin compatible with no circuit modifications required.

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

A: The "/NOPB" suffix denotes "No Plumbum" (lead-free) packaging, indicating compliance with RoHS3 regulations. This is a packaging and compliance designation that does not affect electrical performance or functional equivalence.

Q: Are there differences in thermal or reliability characteristics between these parts?

A: No. Both components operate across the identical temperature range (-40°C to 125°C junction temperature) and maintain the same moisture sensitivity level (MSL 1, Unlimited). Thermal and reliability performance are equivalent.

Q: Why is the original LM2594N-3.3 marked as obsolete?

A: Product obsolescence reflects Texas Instruments' lifecycle management. The LM2594N-3.3/NOPB represents the current active equivalent, incorporating modern compliance standards. For ongoing supply chain access and regulatory compliance, the active part number is recommended.

Q: Does packaging format (tube versus bulk) affect substitution eligibility?

A: No. Packaging format is a procurement and handling consideration only. The LM2594N-3.3/NOPB is supplied in tube packaging, while the original may have been available in alternative formats. Functional equivalence and circuit performance remain unchanged regardless of packaging presentation.