LM2621MMX Equivalent & Substitute Parts

Part Overview

The LM2621MMX is a Boost and SEPIC Switching Regulator IC from Texas Instruments, designed for positive adjustable output applications. It operates with an input voltage range of 1.2V to 14V and delivers up to 2.85A (Switch) output current. The device features a fixed output voltage minimum of 1.24V with adjustable maximum capability up to 14V, operating at a switching frequency between 300kHz and 2MHz.

The LM2621MMX is classified as an Obsolete product. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications currently utilizing this component.

Substiute Parts

LM2621MMX

Texas InstrumentsIn Stock: 1520LM2621MMX Datasheet

Current PartRFQ

LM2621MMX/NOPB

Texas InstrumentsIn Stock: 17289LM2621MMX/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2621MMX is determined by strict equivalence across the following critical parameters:

• Topology and Function: Boost and SEPIC switching regulator capability with Step-Up and Step-Up/Step-Down functionality
• Electrical Specifications: Input voltage range (1.2V to 14V), output voltage range (1.24V to 14V), output current (2.85A Switch), and switching frequency (300kHz to 2MHz)
• Output Configuration: Positive adjustable output with single output channel
• Package Compatibility: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) surface mount package
• Operating Temperature Range: -40°C to 85°C (TA)

The LM2621MMX/NOPB is identified as a direct substitute based on identical electrical and mechanical specifications. The primary distinction is product status and packaging format, with the substitute part classified as Active and available in Tape & Reel (TR) packaging.

Parameter Comparison

Engineering Selection Recommendations

The LM2621MMX/NOPB is the direct equivalent substitute for the LM2621MMX. Both parts share identical electrical and mechanical specifications, ensuring pin-for-pin compatibility and functional equivalence in circuit applications.

The primary advantage of selecting LM2621MMX/NOPB is its Active product status, ensuring continued availability and supply chain support. Additionally, the substitute part meets ROHS3 compliance requirements, whereas the original LM2621MMX is RoHS non-compliant. This distinction is significant for applications subject to environmental and regulatory compliance mandates.

Both parts maintain identical Moisture Sensitivity Level (MSL) classification of 1 (Unlimited) and REACH Unaffected status. The packaging format difference (Cut Tape & Digi-Reel versus standard packaging) does not affect electrical or mechanical performance and is determined by procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Are LM2621MMX and LM2621MMX/NOPB electrically identical?

A: Yes. Both parts are electrically identical across all specified parameters, including input/output voltage ranges, output current capability, switching frequency, operating temperature range, and topology (Boost/SEPIC). They are pin-for-pin compatible and functionally equivalent.

Q: What is the significance of the "/NOPB" suffix in LM2621MMX/NOPB?

A: The "/NOPB" suffix indicates the part is supplied in Tape & Reel (TR) packaging format without plumbum (lead-free). This designation reflects packaging and environmental compliance specifications rather than electrical differences.

Q: Why is the original LM2621MMX classified as Obsolete?

A: Product obsolescence is determined by manufacturer lifecycle decisions. The LM2621MMX/NOPB remains Active and is the recommended substitute for continued design support and supply availability.

Q: Does the RoHS compliance difference affect circuit performance?

A: RoHS compliance status reflects manufacturing process and material composition standards rather than electrical performance. Both parts deliver identical functional characteristics. RoHS3 compliance of the substitute part aligns with current environmental regulations and may be required for specific applications or markets.

Q: Can LM2621MMX/NOPB be used as a direct replacement in existing designs?

A: Yes. The LM2621MMX/NOPB is a direct replacement with identical package, pinout, and electrical specifications. No circuit modifications are required for substitution.

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

A: No. Both parts share identical operating temperature range (-40°C to 85°C), Moisture Sensitivity Level (MSL 1), and thermal characteristics. Reliability and performance are equivalent.