LM2623LD Equivalent & Substitute Parts

Part Overview

The LM2623LD is a boost switching regulator IC from Texas Instruments designed for step-up voltage conversion applications. It delivers positive adjustable output from 1.24V to 14V with a maximum switch current of 2.2A, operating across an input range of 0.8V to 14V. The device is housed in a 14-WFDFN exposed pad surface mount package with a switching frequency range of 300kHz to 2MHz.

The LM2623LD carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with active manufacturing support and current compliance certifications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Function	Step-Up (Boost)
Output Configuration	Positive
Output Type	Adjustable
Number of Outputs	1
Voltage - Input (Min)	0.8V
Voltage - Input (Max)	14V
Voltage - Output (Min/Fixed)	1.24V
Voltage - Output (Max)	14V
Current - Output	2.2A (Switch)
Frequency - Switching	300kHz ~ 2MHz
Synchronous Rectifier	No
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	14-WFDFN Exposed Pad
Supplier Device Package	14-WSON (4x4)

Substitute Part Grouping Explanation

Substitution of the LM2623LD is determined by strict equivalence across the following critical parameters:

Function and topology (boost step-up converter)
Output configuration (positive adjustable)
Electrical specifications (input voltage range 0.8V–14V, output range 1.24V–14V, 2.2A switch current)
Switching frequency range (300kHz–2MHz)
Package type (14-WFDFN exposed pad, 14-WSON 4x4)
Operating temperature range (-40°C to 85°C)
Absence of synchronous rectifier

The LM2623LD/NOPB is a direct equivalent manufactured by Texas Instruments under the same base product number (LM2623) with identical electrical and mechanical specifications. The primary distinction is packaging format and product lifecycle status.

Parameter Comparison

Parameter	LM2623LD	LM2623LD/NOPB
Manufacturer	Texas Instruments	Texas Instruments
Base Product Number	LM2623	LM2623
Function	Step-Up	Step-Up
Output Configuration	Positive	Positive
Output Type	Adjustable	Adjustable
Voltage - Input (Min)	0.8V	0.8V
Voltage - Input (Max)	14V	14V
Voltage - Output (Min/Fixed)	1.24V	1.24V
Voltage - Output (Max)	14V	14V
Current - Output	2.2A (Switch)	2.2A (Switch)
Frequency - Switching	300kHz ~ 2MHz	300kHz ~ 2MHz
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	14-WFDFN Exposed Pad	14-WFDFN Exposed Pad
Supplier Device Package	14-WSON (4x4)	14-WSON (4x4)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Packaging Format	Bulk	Tape & Reel (TR)

Engineering Selection Recommendations

The LM2623LD/NOPB is the direct functional and electrical equivalent of the LM2623LD. Selection between these parts should be based on the following criteria:

Product Status: The LM2623LD is obsolete, while the LM2623LD/NOPB maintains active product status with ongoing manufacturing support from Texas Instruments. For new designs or long-term production requirements, the LM2623LD/NOPB is the preferred choice.

Compliance Certifications: The LM2623LD/NOPB is ROHS3 compliant, whereas the LM2623LD is RoHS non-compliant. Applications subject to RoHS regulations or customer compliance requirements must use the LM2623LD/NOPB.

Packaging Format: The LM2623LD is supplied in bulk packaging, while the LM2623LD/NOPB is supplied in tape and reel format. Tape and reel packaging is standard for automated assembly processes and high-volume production environments.

Electrical and Mechanical Equivalence: Both parts are electrically and mechanically identical across all specified parameters, including voltage ratings, current capacity, switching frequency, temperature range, and package dimensions.

Frequently Asked Questions (FAQ)

Q: Can the LM2623LD/NOPB be used as a direct replacement for the LM2623LD?

A: Yes. The LM2623LD/NOPB is electrically and mechanically equivalent to the LM2623LD. Both devices share identical electrical specifications, package type, and pin configuration. The primary differences are product lifecycle status and compliance certifications.

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

A: The "/NOPB" suffix indicates that the component is supplied in tape and reel packaging without plumbum (lead-free, RoHS compliant). This is the standard packaging format for high-volume automated assembly.

Q: Why is the LM2623LD marked as obsolete?

A: Product obsolescence is determined by the manufacturer based on market demand, technology evolution, and production decisions. The LM2623LD/NOPB remains in active production and is the recommended choice for current applications.

Q: Are there any differences in electrical performance between these parts?

A: No. Both the LM2623LD and LM2623LD/NOPB deliver identical electrical performance across all specified parameters: input voltage range, output voltage range, switch current, switching frequency, and operating temperature.

Q: What is the significance of the RoHS compliance difference?

A: RoHS (Restriction of Hazardous Substances) compliance is a regulatory requirement in many markets. The LM2623LD/NOPB is ROHS3 compliant, making it suitable for applications subject to RoHS regulations. The LM2623LD is non-compliant and may not be acceptable for regulated applications or customer specifications requiring RoHS certification.

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

A: Yes, from an electrical and mechanical standpoint. However, the packaging format difference (bulk versus tape and reel) affects assembly process compatibility. Tape and reel packaging (LM2623LD/NOPB) is standard for automated pick-and-place assembly, while bulk packaging may require manual handling.

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