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FX001 Buck Regulator Controller IC Equivalent & Substitute Parts
Part Overview
The FX001 is an active Buck Regulator Positive Output Step-Down DC-DC Controller IC manufactured by Texas Instruments, housed in a 24-VQFN (4x4) package with exposed pad. This PMIC functions as a transistor driver for step-down topology applications with dual outputs and single phase operation. The device integrates synchronous rectification and includes control features for enable, on-time control, and power good monitoring. Finding equivalent substitute parts is necessary to ensure supply chain flexibility, optimize inventory management, and maintain design continuity when the primary part number becomes unavailable or when alternative packaging formats are required for specific manufacturing processes.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Category | Power Management (PMIC) |
| Function | Step-Down Buck Regulator Controller |
| Output Type | Transistor Driver |
| Output Configuration | Positive |
| Number of Outputs | 2 |
| Output Phases | 1 |
| Voltage Supply Range (Vcc/Vdd) | 5.5V ~ 28V |
| Synchronous Rectifier | Yes |
| Control Features | Enable, On Time Control, Power Good |
| Operating Temperature Range | -40°C ~ 85°C (TA) |
| Package / Case | 24-VFQFN Exposed Pad |
| Supplier Device Package | 24-VQFN (4x4) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) |
| REACH Status | REACH Unaffected |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitute parts for the FX001 are qualified based on strict parametric equivalence across all critical electrical and mechanical specifications. The substitution logic is based on the following key parameters that must remain identical:
- Output Type: Transistor Driver
- Function: Step-Down
- Output Configuration: Positive
- Topology: Buck
- Number of Outputs: 2
- Output Phases: 1
- Voltage Supply Range: 5.5V ~ 28V
- Synchronous Rectifier: Yes
- Control Features: Enable, On Time Control, Power Good
- Operating Temperature Range: -40°C ~ 85°C (TA)
- Package / Case: 24-VFQFN Exposed Pad
- Supplier Device Package: 24-VQFN (4x4)
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level: 2 (1 Year)
- REACH Status: REACH Unaffected
All substitute parts listed below meet these criteria. Variations in packaging format (Tape & Reel, Cut Tape & Digi-Reel) do not affect electrical equivalence and are determined by manufacturing and logistics requirements.
Parameter Comparison
| Parameter | FX001 | TPS51125ARGER | TPS51125ARGET | TPS51125RGER |
|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Category | Power Management (PMIC) | Power Management (PMIC) | Power Management (PMIC) | Power Management (PMIC) |
| Series | - | D-CAP™ | D-CAP™ | D-CAP™ |
| Output Type | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver |
| Function | Step-Down | Step-Down | Step-Down | Step-Down |
| Output Configuration | Positive | Positive | Positive | Positive |
| Topology | Buck | Buck | Buck | Buck |
| Number of Outputs | 2 | 2 | 2 | 2 |
| Output Phases | 1 | 1 | 1 | 1 |
| Voltage Supply Range (Vcc/Vdd) | 5.5V ~ 28V | 5.5V ~ 28V | 5.5V ~ 28V | 5.5V ~ 28V |
| Synchronous Rectifier | Yes | Yes | Yes | Yes |
| Control Features | Enable, On Time Control, Power Good | Enable, On Time Control, Power Good | Enable, On Time Control, Power Good | Enable, On Time Control, Power Good |
| Operating Temperature Range | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Package / Case | 24-VFQFN Exposed Pad | 24-VFQFN Exposed Pad | 24-VFQFN Exposed Pad | 24-VFQFN Exposed Pad |
| Supplier Device Package | 24-VQFN (4x4) | 24-VQFN (4x4) | 24-VQFN (4x4) | 24-VQFN (4x4) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) | 2 (1 Year) | 2 (1 Year) | 2 (1 Year) |
| REACH Status | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected |
| Product Status | Active | Active | Active | Active |
| Packaging Format | Tape & Reel (TR) | - | Tape & Reel (TR) | Cut Tape (CT) & Digi-Reel® |
| Inventory Availability | 780 Pcs | 17100 Pcs | 1768 Pcs | 35200 Pcs |
Engineering Selection Recommendations
All substitute parts listed—TPS51125ARGER, TPS51125ARGET, and TPS51125RGER—are parametrically equivalent to the FX001 and are qualified for direct substitution in applications requiring a Buck Regulator Positive Output Step-Down DC-DC Controller IC in 24-VQFN (4x4) package format.
Selection among substitute parts should be based on:
- Packaging format requirements: TPS51125ARGET is available in Tape & Reel (TR) format, matching the FX001 packaging. TPS51125RGER is available in Cut Tape (CT) & Digi-Reel® format. TPS51125ARGER packaging format is not specified.
- Inventory availability: TPS51125RGER offers the highest stock level at 35200 pieces, followed by TPS51125ARGER at 17100 pieces and TPS51125ARGET at 1768 pieces.
- All parts maintain Active product status and full compliance with ROHS3, REACH Unaffected, and MSL 2 (1 Year) specifications.
Frequently Asked Questions (FAQ)
Q: Can TPS51125ARGER, TPS51125ARGET, and TPS51125RGER be used interchangeably with FX001?
A: Yes. All three substitute parts are parametrically equivalent to the FX001 across all critical electrical and mechanical specifications, including output type, function, topology, voltage supply range, control features, operating temperature range, package type, and compliance certifications.
Q: What is the difference between the packaging formats of these substitute parts?
A: The primary difference is the delivery format. TPS51125ARGET is supplied in Tape & Reel (TR) format, identical to the FX001. TPS51125RGER is supplied in Cut Tape (CT) & Digi-Reel® format. TPS51125ARGER does not specify a packaging format. These variations do not affect electrical performance or PCB assembly compatibility; they are determined by manufacturing and logistics processes.
Q: Are all substitute parts RoHS3 compliant and REACH unaffected?
A: Yes. All substitute parts—TPS51125ARGER, TPS51125ARGET, and TPS51125RGER—are ROHS3 Compliant and REACH Unaffected, matching the FX001 compliance profile.
Q: What is the Moisture Sensitivity Level (MSL) for these parts?
A: All parts, including the FX001 and all substitutes, have an MSL rating of 2 with a 1-year shelf life under controlled storage conditions.
Q: Which substitute part has the best inventory availability?
A: TPS51125RGER has the highest inventory availability at 35200 pieces in stock. TPS51125ARGER has 17100 pieces available, and TPS51125ARGET has 1768 pieces available.
Q: Do these substitute parts belong to the same product series?
A: The FX001 does not specify a series designation. The substitute parts TPS51125ARGER, TPS51125ARGET, and TPS51125RGER all belong to the D-CAP™ series from Texas Instruments.
Q: Are there any differences in operating temperature range between the FX001 and substitute parts?
A: No. All parts operate across the identical temperature range of -40°C to 85°C (TA).
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