LM3000ASQX/NOPB Equivalent & Substitute Parts

Part Overview

The LM3000ASQX/NOPB is a buck regulator positive output step-down DC-DC controller IC manufactured by Texas Instruments in a 32-WQFN (5x5) package with exposed pad. This component functions as a transistor driver for step-down voltage conversion applications with dual output phases and integrated synchronous rectification.

The LM3000ASQX/NOPB has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this controller.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Function	Step-Down DC-DC Controller
Output Type	Transistor Driver
Topology	Buck
Number of Outputs	2
Output Phases	2
Voltage Supply Range (Vcc/Vdd)	3.3V ~ 5.5V
Switching Frequency Range	200kHz ~ 1.5MHz
Maximum Duty Cycle	85%
Synchronous Rectifier	Yes
Clock Sync	Yes
Control Features	Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
Operating Temperature Range	-40°C ~ 125°C (TJ)
Package / Case	32-WQFN Exposed Pad (5x5)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM3000ASQX/NOPB are identified based on strict electrical and mechanical parameter equivalence. The primary substitute, LM3000SQ/NOPB, shares identical functional specifications across all critical parameters that determine interchangeability:

Identical buck regulator topology and step-down DC-DC controller function
Matching dual-output, dual-phase configuration
Identical supply voltage range (3.3V ~ 5.5V)
Identical switching frequency range (200kHz ~ 1.5MHz)
Matching maximum duty cycle (85%)
Identical synchronous rectifier and clock sync capabilities
Identical control feature set (Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking)
Matching operating temperature range (-40°C ~ 125°C)
Identical package specification (32-WQFN Exposed Pad, 5x5)
Identical RoHS3 compliance and MSL rating

The primary difference between the main part and substitute is packaging format and product status. The LM3000ASQX/NOPB is supplied in standard packaging (obsolete status), while LM3000SQ/NOPB is supplied in Tape & Reel format with active product status.

Parameter Comparison

Parameter	LM3000ASQX/NOPB	LM3000SQ/NOPB
Manufacturer	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active
Packaging Format	Standard	Tape & Reel (TR)
Function	Step-Down DC-DC Controller	Step-Down DC-DC Controller
Output Type	Transistor Driver	Transistor Driver
Topology	Buck	Buck
Number of Outputs	2	2
Output Phases	2	2
Voltage Supply Range	3.3V ~ 5.5V	3.3V ~ 5.5V
Switching Frequency Range	200kHz ~ 1.5MHz	200kHz ~ 1.5MHz
Maximum Duty Cycle	85%	85%
Synchronous Rectifier	Yes	Yes
Clock Sync	Yes	Yes
Control Features	Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking	Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
Operating Temperature Range	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	32-WQFN Exposed Pad (5x5)	32-WQFN Exposed Pad (5x5)
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The LM3000SQ/NOPB is the direct substitute for the obsolete LM3000ASQX/NOPB. Both parts maintain identical electrical and mechanical specifications, ensuring functional compatibility in existing circuit designs without modification.

Selection of LM3000SQ/NOPB is supported by:

Active product status with confirmed supply availability (3200 pcs in stock versus 756 pcs for obsolete part)
Identical ROHS3 compliance certification
Matching MSL rating (1 - Unlimited) for storage and handling
Tape & Reel packaging format suitable for automated assembly processes
Identical thermal and electrical performance characteristics across the full operating temperature range

No design changes, PCB modifications, or firmware updates are required when transitioning from LM3000ASQX/NOPB to LM3000SQ/NOPB.

Frequently Asked Questions (FAQ)

Q: Can LM3000SQ/NOPB be used as a direct replacement for LM3000ASQX/NOPB?

A: Yes. Both parts are electrically and mechanically identical. The LM3000SQ/NOPB is supplied in Tape & Reel format with active product status, making it the recommended substitute for the obsolete LM3000ASQX/NOPB.

Q: What is the difference between the two part numbers?

A: The primary differences are packaging format and product lifecycle status. LM3000ASQX/NOPB is obsolete with standard packaging, while LM3000SQ/NOPB is active with Tape & Reel packaging. All electrical specifications, pin configurations, and performance characteristics are identical.

Q: Are there any compatibility concerns with the 32-WQFN package?

A: No. Both parts use the identical 32-WQFN (5x5) package with exposed pad. PCB footprints, solder reflow profiles, and thermal management approaches remain unchanged.

Q: Does the Tape & Reel packaging affect circuit performance?

A: No. Tape & Reel is a supply format for automated assembly. Once soldered to the PCB, the component performs identically to standard packaging formats.

Q: Are RoHS and compliance certifications maintained?

A: Yes. Both LM3000ASQX/NOPB and LM3000SQ/NOPB maintain ROHS3 compliance and identical REACH and ECCN classifications.

Q: What is the moisture sensitivity level, and does it differ between parts?

A: Both parts have MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

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