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TPS65121RGTT Equivalent & Substitute Parts
Part Overview
The TPS65121RGTT is a TFT LCD voltage regulator IC manufactured by Texas Instruments, designed for power management applications requiring multiple regulated outputs. This device functions as a converter with four independent outputs, supporting input voltages from 2.5V to 5.5V and adjustable output voltages ranging from 3V to 5.6V, with adjustment capability up to 20V or down to -18V. The component is currently classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Base Product Number | TPS65121 |
| Category | Power Management (PMIC) |
| Package / Case | 16-VFQFN Exposed Pad |
| Supplier Device Package | 16-VQFN (3x3) |
| Number of Outputs | 4 |
| Voltage - Input | 2.5V ~ 5.5V |
| Voltage - Output | 3V ~ 5.6V, Adj up to 20V, Adj down to -18V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) |
Substitute Part Grouping Explanation
Substitution of the TPS65121RGTT is determined by strict equivalence across the following critical parameters:
- Manufacturer and Base Product Number: Both the main part and substitute must originate from Texas Instruments and share the base product number TPS65121 to ensure identical die and functional specifications.
- Package and Pinout: The 16-VFQFN Exposed Pad package with 3x3mm dimensions must be maintained to ensure PCB compatibility without layout modifications.
- Electrical Specifications: Input voltage range (2.5V ~ 5.5V), number of outputs (4), and output voltage capabilities (3V ~ 5.6V adjustable, up to 20V or down to -18V) must remain unchanged.
- Environmental and Compliance Ratings: Operating temperature range (-40°C ~ 85°C), RoHS3 compliance, and MSL rating (2, 1 Year) must be identical.
- Packaging Format: The primary distinction between the main part and its substitute is the packaging format (tube versus tape & reel), which does not affect electrical or mechanical compatibility.
Parameter Comparison
| Parameter | TPS65121RGTT | TPS65121RGTR |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Base Product Number | TPS65121 | TPS65121 |
| Category | Power Management (PMIC) | Power Management (PMIC) |
| Package / Case | 16-VFQFN Exposed Pad | 16-VFQFN Exposed Pad |
| Supplier Device Package | 16-VQFN (3x3) | 16-VQFN (3x3) |
| Number of Outputs | 4 | 4 |
| Voltage - Input | 2.5V ~ 5.5V | 2.5V ~ 5.5V |
| Voltage - Output | 3V ~ 5.6V, Adj up to 20V, Adj down to -18V | 3V ~ 5.6V, Adj up to 20V, Adj down to -18V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) | 2 (1 Year) |
| Product Status | Obsolete | Active |
| Packaging Format | Tube | Tape & Reel (TR) |
Engineering Selection Recommendations
The TPS65121RGTR is the direct equivalent substitute for the TPS65121RGTT. Both parts share identical electrical specifications, package geometry, and compliance certifications. The primary distinction is product status: the TPS65121RGTT is obsolete, while the TPS65121RGTR maintains active status with Texas Instruments. The TPS65121RGTR is supplied in tape & reel packaging format, which is standard for automated assembly processes and high-volume production environments. For applications currently using the TPS65121RGTT, transition to the TPS65121RGTR is supported without circuit modification or PCB redesign, as all functional and mechanical parameters remain equivalent.
Frequently Asked Questions (FAQ)
Q: Can the TPS65121RGTR be used as a direct replacement for the TPS65121RGTT?
A: Yes. Both parts are based on the identical TPS65121 die and share all electrical specifications, package dimensions, and compliance ratings. The only difference is packaging format and product status.
Q: What is the difference between the tube and tape & reel packaging formats?
A: Tube packaging (TPS65121RGTT) is typically used for lower-volume or manual assembly applications. Tape & reel packaging (TPS65121RGTR) is designed for automated pick-and-place assembly and is the standard format for high-volume production. Both formats contain the same component with identical electrical performance.
Q: Are there any PCB layout or schematic modifications required when switching from TPS65121RGTT to TPS65121RGTR?
A: No. Both parts use the identical 16-VFQFN (3x3mm) package with the same pinout. PCB layouts and schematics require no modification.
Q: Why is the TPS65121RGTT listed as obsolete?
A: Product obsolescence is determined by the manufacturer based on market demand and production decisions. The TPS65121RGTR remains in active production and is the recommended part for new designs and ongoing procurement.
Q: Are the RoHS and compliance certifications identical between these parts?
A: Yes. Both the TPS65121RGTT and TPS65121RGTR carry ROHS3 compliance, REACH unaffected status, and identical MSL ratings (2, 1 Year).
Q: What is the inventory status for these parts?
A: The TPS65121RGTT has 717 pieces in stock. The TPS65121RGTR has 2100 pieces in stock and is actively supplied by Texas Instruments.
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