LM1771SSD/NOPB Equivalent & Substitute Parts

Part Overview

The LM1771SSD/NOPB is a buck regulator positive output step-down DC-DC controller IC manufactured by Texas Instruments in a 6-WSON (3x3) package. This active product functions as a transistor driver for step-down voltage conversion applications with a single output phase. The device operates across a supply voltage range of 2.8V to 5.5V with switching frequencies between 100kHz and 1MHz, incorporating synchronous rectification for improved efficiency. Finding equivalent substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and maintain component availability across production cycles.

Substiute Parts

LM1771SSD/NOPB

Texas InstrumentsIn Stock: 6020LM1771SSD/NOPB Datasheet

Current PartRFQ

LM1771USD/NOPB

Texas InstrumentsIn Stock: 2098LM1771USD/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM1771SSD/NOPB are determined by strict equivalence across the following critical parameters:

• Manufacturer: Texas Instruments
• Base Product Number: LM1771
• Function: Step-Down Buck Regulator Controller
• Output Type: Transistor Driver
• Output Configuration: Positive
• Topology: Buck
• Number of Outputs: 1
• Output Phases: 1
• Voltage - Supply (Vcc/Vdd): 2.8V ~ 5.5V
• Frequency - Switching: 100kHz ~ 1MHz
• Synchronous Rectifier: Yes
• Control Features: Enable
• Operating Temperature: -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 (MSL): 1 (Unlimited)

The LM1771USD/NOPB qualifies as a parametric equivalent because it maintains identical specifications across all critical electrical and mechanical parameters. The only distinction between these parts is the packaging format designation (SSD versus USD), which represents different tape and reel configurations from the same manufacturer, both meeting the same functional and compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the LM1771SSD/NOPB and LM1771USD/NOPB are active products from Texas Instruments with identical electrical and mechanical specifications. Selection between these parts should be based on:

• Supply chain availability and lead times
• Packaging format requirements specific to your procurement and assembly processes
• Inventory management and stock rotation policies
• Compliance certifications: Both parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 export classification
• Moisture sensitivity: Both parts carry MSL 1 (Unlimited) rating, indicating no special moisture handling requirements during storage or assembly

The parametric equivalence of these parts ensures direct substitution without circuit redesign or functional compromise.

Frequently Asked Questions (FAQ)

Q: Can LM1771USD/NOPB be used as a direct replacement for LM1771SSD/NOPB?

A: Yes. Both parts share identical electrical specifications, functional characteristics, and package dimensions. The difference between SSD and USD designations refers to tape and reel packaging configurations only. Direct substitution is possible without circuit modification.

Q: Are there any differences in pin configuration or footprint between these parts?

A: No. Both parts use the 6-WSON (3x3) package with 6-WDFN exposed pad configuration. Pin assignments and PCB footprints are identical.

Q: Do both parts meet the same compliance and regulatory requirements?

A: Yes. Both the LM1771SSD/NOPB and LM1771USD/NOPB are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export purposes. Both carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the primary reason to consider substitution between these parts?

A: Supply chain continuity and component availability. When one packaging variant experiences supply constraints, the equivalent variant can be used to maintain production schedules without functional or performance impact.

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

A: No. Both parts operate across the same temperature range (-40°C to 125°C junction temperature) and maintain identical switching frequency specifications (100kHz to 1MHz) and supply voltage range (2.8V to 5.5V).

Q: What should be verified before implementing a substitution in production?

A: Confirm that your assembly equipment and processes support the specific tape and reel format of the substitute part. Verify component availability and lead times with your supplier. Ensure procurement documentation reflects the correct part number for traceability.