TPS40091RHDR Equivalent & Substitute Parts

Part Overview

The TPS40091RHDR is a Buck Regulator Positive Output Step-Down DC-DC Controller IC manufactured by Texas Instruments, housed in a 28-VQFN (5x5) package. This device functions as a PWM signal-based step-down controller with 4-phase output capability, designed for power management applications requiring regulated voltage conversion from 4.5V to 15V supply inputs.

The TPS40091RHDR is classified as Obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this controller.

Substiute Parts

TPS40091RHDR

Texas InstrumentsIn Stock: 1118TPS40091RHDR Datasheet

Current PartRFQ

TPS40091PWR

Texas InstrumentsIn Stock: 1441TPS40091PWR Datasheet

MFR RecommendedRFQ

TPS40090RHDR

Texas InstrumentsIn Stock: 1949TPS40090RHDR Datasheet

Parametric EquivalentRFQ

TPS40090RHDT

Texas InstrumentsIn Stock: 1048TPS40090RHDT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TPS40091RHDR is determined by the following critical parameters:

• Functional Equivalence: Step-down buck topology with PWM signal output and 4-phase capability
• Electrical Specifications: Supply voltage range (4.5V ~ 15V), switching frequency (100kHz ~ 1.2MHz), duty cycle maximum (87.5%)
• Control Features: Current limit, enable, frequency control, power good, and soft start functionality
• Operating Temperature Range: -40°C ~ 85°C (TA)
• Compliance: ROHS3 compliance and REACH unaffected status
• Mounting and Package Compatibility: Surface mount technology with specified package types

Substitute parts are grouped into two categories:

1. MFR Recommended Substitute (Package Variant): TPS40091PWR — Same base product number with alternative packaging (24-TSSOP vs. 28-VQFN), suitable when PCB layout accommodates the different package footprint.

2. Parametric Equivalents (Same Package): TPS40090RHDR and TPS40090RHDT — Different base product numbers but identical electrical and functional specifications, maintaining the same 28-VQFN package form factor.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Package Footprint)

TPS40090RHDR and TPS40090RHDT are the primary substitutes for TPS40091RHDR when package compatibility is required. Both maintain the 28-VQFN (5x5) form factor and are classified as Active products, ensuring long-term availability and supply chain stability. Both parts meet ROHS3 compliance and REACH unaffected requirements. The distinction between RHDR and RHDT variants relates to tape and reel specifications; selection depends on procurement and assembly requirements.

For Alternative Packaging

TPS40091PWR provides functional equivalence with improved moisture sensitivity rating (MSL 1 vs. MSL 2), offering unlimited shelf life compared to the 1-year limitation of the main part. This substitute requires PCB layout modification to accommodate the 24-TSSOP package footprint. TPS40091PWR is classified as Active, supporting long-term design continuity.

Compliance and Certification

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original TPS40091RHDR specification.

Frequently Asked Questions (FAQ)

Q: Can TPS40091PWR be used as a direct pin-for-pin replacement for TPS40091RHDR?

A: No. TPS40091PWR uses a 24-TSSOP package while TPS40091RHDR uses a 28-VQFN package. Pin count and footprint differ, requiring PCB redesign. However, electrical and functional specifications are identical, making it suitable for new designs or redesigned layouts.

Q: What is the difference between TPS40090RHDR and TPS40090RHDT?

A: Both parts are electrically and functionally identical with the same 28-VQFN package. The difference lies in tape and reel specifications (RHDR vs. RHDT designations). Selection depends on assembly line requirements and procurement preferences.

Q: Why is TPS40091RHDR classified as Obsolete?

A: Obsolete status indicates the part is no longer in active production. TPS40090RHDR and TPS40090RHDT are Active alternatives with identical specifications, ensuring continued availability for replacement and new production.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. TPS40091PWR, TPS40090RHDR, and TPS40090RHDT are all ROHS3 compliant and REACH unaffected, matching the compliance profile of TPS40091RHDR.

Q: What does MSL rating mean, and why does TPS40091PWR differ?

A: MSL (Moisture Sensitivity Level) indicates shelf life under controlled storage conditions. TPS40091PWR has MSL 1 (unlimited shelf life), while TPS40091RHDR, TPS40090RHDR, and TPS40090RHDT have MSL 2 (1-year shelf life). TPS40091PWR offers superior storage stability.

Q: Can I use these substitutes in existing designs without modification?

A: TPS40090RHDR and TPS40090RHDT maintain the same 28-VQFN package and can be used without PCB modification. TPS40091PWR requires PCB layout changes due to its 24-TSSOP package. All three are electrically compatible with the original design specifications.