LM1770TMF/NOPB Equivalent & Substitute Parts

Part Overview

The LM1770TMF/NOPB is a buck regulator controller IC manufactured by Texas Instruments, designed for positive output step-down DC-DC conversion applications. This device operates as a transistor driver with a single output phase and is housed in a SOT-23-5 surface mount package. The part is currently active in production with 2368 units available in inventory. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same product category, enabling design flexibility and supply chain continuity.

Substiute Parts

LM1770TMF/NOPB

Texas InstrumentsIn Stock: 2389LM1770TMF/NOPB Datasheet

Current PartRFQ

LM1770SMF/NOPB

Texas InstrumentsIn Stock: 1891LM1770SMF/NOPB Datasheet

Parametric EquivalentRFQ

LM1770UMFX/NOPB

Texas InstrumentsIn Stock: 2930LM1770UMFX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM1770TMF/NOPB are identified based on strict parametric equivalence within the following criteria:

• Identical manufacturer (Texas Instruments)
• Identical product category (Power Management PMIC)
• Identical function (Step-Down Buck Regulator Controller)
• Identical output type (Transistor Driver)
• Identical output configuration (Positive)
• Identical number of outputs and phases (1 output, 1 phase)
• Identical voltage supply range (2.8V ~ 5.5V)
• Identical switching frequency range (100kHz ~ 1MHz)
• Identical synchronous rectifier capability (Yes)
• Identical operating temperature range (-40°C ~ 125°C)
• Identical package type (SOT-23-5)
• Identical mounting type (Surface Mount)
• Identical compliance status (ROHS3 Compliant, MSL 1)

The substitutes LM1770SMF/NOPB and LM1770UMFX/NOPB meet all these criteria and are therefore direct parametric equivalents suitable for component selection.

Parameter Comparison

Engineering Selection Recommendations

All three parts—LM1770TMF/NOPB, LM1770SMF/NOPB, and LM1770UMFX/NOPB—are active products from Texas Instruments with identical electrical and mechanical specifications. Selection among these parts may be based on inventory availability and supply chain considerations. The LM1770UMFX/NOPB offers the highest current inventory level at 2833 units. All parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage requirements. The identical SOT-23-5 package and surface mount configuration enable direct substitution without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can LM1770SMF/NOPB be used as a direct replacement for LM1770TMF/NOPB?

A: Yes. Both parts share identical electrical parameters, including voltage supply range (2.8V ~ 5.5V), switching frequency (100kHz ~ 1MHz), output configuration (positive, single phase), and operating temperature range (-40°C ~ 125°C). Both are housed in SOT-23-5 packages and are surface mount devices. No circuit modifications are required.

Q: What is the difference between LM1770TMF/NOPB and LM1770UMFX/NOPB?

A: The parts are parametrically equivalent across all electrical and mechanical specifications. The designations T, S, and U represent different temperature or manufacturing grades within the same product family, but the provided parameters are identical. Both are suitable for the same applications.

Q: Are all three parts RoHS compliant?

A: Yes. LM1770TMF/NOPB, LM1770SMF/NOPB, and LM1770UMFX/NOPB are all ROHS3 compliant with MSL 1 rating, meeting environmental and regulatory requirements for standard manufacturing environments.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. All three parts use the identical SOT-23-5 surface mount package (SC-74A, SOT-753). Pin configuration and footprint are identical, enabling direct substitution without PCB layout changes.

Q: Which part should be selected based on availability?

A: Selection may be based on current inventory levels. LM1770UMFX/NOPB has 2833 units available, LM1770TMF/NOPB has 2368 units, and LM1770SMF/NOPB has 1874 units. All are active products with equivalent performance characteristics.