FX003 Buck Regulator Controller - Equivalent & Substitute Parts

Part Overview

The FX003 is an active Buck Regulator Positive Output Step-Down DC-DC Controller IC manufactured by Texas Instruments in a 16-WQFN (3x3) package with exposed pad. This device functions as a transistor driver for step-down topology applications with positive output configuration and integrated synchronous rectifier support. The part is currently in active production status with 808 units in stock.

Substitute parts are identified when they maintain electrical and mechanical compatibility across critical parameters including supply voltage range, output topology, package configuration, control features, and regulatory compliance status.

Substiute Parts

FX003

Texas InstrumentsIn Stock: 818FX003 Datasheet

Current PartRFQ

TPS51219RTER

Texas InstrumentsIn Stock: 6486TPS51219RTER Datasheet

Parametric EquivalentRFQ

TPS51219RTET

Texas InstrumentsIn Stock: 3939TPS51219RTET Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FX003 are qualified based on strict equivalence across the following critical parameters:

• Package Compatibility: Identical 16-WQFN (3x3) with exposed pad configuration
• Electrical Function: Buck topology step-down controller with positive output and transistor driver output type
• Supply Voltage Range: 3V ~ 28V input voltage specification
• Output Configuration: Single output, single phase
• Synchronous Rectifier: Integrated synchronous rectifier support
• Control Features: Enable and Power Good functions
• Operating Temperature: -40°C ~ 85°C range
• Regulatory Compliance: ROHS3 compliant, REACH unaffected, EAR99 classification
• Moisture Sensitivity: MSL 2 (1 Year)

The TPS51219RTER and TPS51219RTET variants meet all substitution criteria. Differences in packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

All three parts—FX003, TPS51219RTER, and TPS51219RTET—are active production devices from Texas Instruments with identical electrical and mechanical specifications. Selection between these parts is determined by packaging and inventory requirements rather than functional differences.

FX003: Available in Tape & Reel (TR) packaging with 808 units in stock.

TPS51219RTER: Available in Cut Tape (CT) & Digi-Reel® packaging with 6450 units in stock. This variant provides higher inventory availability.

TPS51219RTET: Available in Tape & Reel (TR) packaging with 3850 units in stock.

All parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 export classification. Moisture sensitivity level MSL 2 (1 Year) applies uniformly across all variants.

Frequently Asked Questions (FAQ)

Q: Can TPS51219RTER or TPS51219RTET be used as direct replacements for FX003?

A: Yes. Both TPS51219 variants are parametric equivalents with identical electrical function, supply voltage range, output topology, package configuration, and control features. They are pin-compatible and functionally interchangeable.

Q: What is the difference between TPS51219RTER and TPS51219RTET?

A: The primary difference is packaging format. TPS51219RTER uses Cut Tape & Digi-Reel® packaging, while TPS51219RTET uses standard Tape & Reel packaging. Both maintain identical electrical and mechanical specifications. Selection depends on assembly line requirements and tape format compatibility.

Q: Are there differences in switching frequency between FX003 and TPS51219 variants?

A: Switching frequency specifications are not provided for the TPS51219 variants in the available data. The FX003 specifies 300kHz ~ 670kHz. Consult device datasheets for detailed frequency specifications if this parameter is critical to your application.

Q: Do all three parts support the same control features?

A: Yes. FX003, TPS51219RTER, and TPS51219RTET all include Enable and Power Good control features with identical functionality.

Q: Are there any compliance or regulatory differences between these parts?

A: No. All three parts share identical compliance status: ROHS3 compliant, REACH unaffected, EAR99 classification, and MSL 2 (1 Year) moisture sensitivity level.

Q: Which part should I select based on inventory availability?

A: TPS51219RTER offers the highest inventory with 6450 units in stock. TPS51219RTET provides 3850 units, and FX003 provides 808 units. Inventory selection should align with production volume and lead time requirements.