LM1771SSDX/NOPB Equivalent & Substitute Parts

Part Overview

The LM1771SSDX/NOPB is a Buck Regulator Positive Output Step-Down DC-DC Controller IC manufactured by Texas Instruments in a 6-WSON (3x3) package. This component functions as a transistor driver for step-down voltage conversion applications with a single output phase. The part is classified as obsolete, making identification of active equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

LM1771SSDX/NOPB

Texas InstrumentsIn Stock: 1077LM1771SSDX/NOPB Datasheet

Current PartRFQ

LM1771SSD/NOPB

Texas InstrumentsIn Stock: 6020LM1771SSD/NOPB Datasheet

Parametric EquivalentRFQ

LM1771USD/NOPB

Texas InstrumentsIn Stock: 2098LM1771USD/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM1771SSDX/NOPB are determined by matching the following critical parameters:

• Manufacturer: Texas Instruments
• Base Product Number: LM1771
• Function: Step-Down Buck Regulator Controller
• Output Type: Transistor Driver
• Output Configuration: Positive
• Number of Outputs: 1
• Output Phases: 1
• Voltage Supply Range: 2.8V ~ 5.5V
• Switching Frequency: 100kHz ~ 1MHz
• Synchronous Rectifier: Yes
• Control Features: Enable
• Operating Temperature Range: -40°C ~ 125°C (TJ)
• Package / Case: 6-WDFN Exposed Pad
• Supplier Device Package: 6-WSON (3x3)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)
• REACH Status: REACH Unaffected

The primary difference between the main part and substitutes is product status and packaging configuration. The LM1771SSDX/NOPB is obsolete, while LM1771SSD/NOPB and LM1771USD/NOPB are active products. All three parts share identical electrical specifications and package footprints.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the obsolete LM1771SSDX/NOPB, both LM1771SSD/NOPB and LM1771USD/NOPB are direct functional equivalents. Selection between these active alternatives depends on procurement requirements and packaging preferences.

LM1771SSD/NOPB is available in Tape & Reel (TR) packaging with 6002 pieces in current inventory. LM1771USD/NOPB is also available in Tape & Reel (TR) packaging with 2013 pieces in current inventory. Both parts maintain identical electrical specifications, thermal performance, and compliance certifications (ROHS3 Compliant, REACH Unaffected).

The choice between LM1771SSD/NOPB and LM1771USD/NOPB should be based on supply chain availability and volume requirements, as both parts are electrically and mechanically interchangeable within the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can LM1771SSD/NOPB or LM1771USD/NOPB be used as direct replacements for LM1771SSDX/NOPB?

A: Yes. All three parts share identical electrical specifications, package footprints, and thermal characteristics. The primary difference is product status: LM1771SSDX/NOPB is obsolete, while LM1771SSD/NOPB and LM1771USD/NOPB are active products.

Q: What is the difference between LM1771SSD/NOPB and LM1771USD/NOPB?

A: Both parts are electrically identical and use the same 6-WSON (3x3) package. The difference is packaging configuration: both are supplied in Tape & Reel (TR) format. Selection should be based on inventory availability and procurement volume requirements.

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

A: No. All three parts operate within the same temperature range (-40°C ~ 125°C TJ) and maintain identical switching frequency specifications (100kHz ~ 1MHz) and supply voltage range (2.8V ~ 5.5V).

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. LM1771SSD/NOPB and LM1771USD/NOPB are both ROHS3 Compliant, REACH Unaffected, with Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the original LM1771SSDX/NOPB.

Q: Is the 6-WSON (3x3) package footprint identical across all three parts?

A: Yes. All three parts use the 6-WDFN Exposed Pad package with 6-WSON (3x3) supplier device package designation, ensuring PCB layout compatibility without modification.