TPS40140RHHT Equivalent & Substitute Parts

Part Overview

The TPS40140RHHT is a buck regulator positive output step-down DC-DC controller IC manufactured by Texas Instruments in a 36-VQFN (6x6) package with exposed pad. This device functions as a transistor driver for two-phase buck topology applications with integrated synchronous rectification. The part is classified as "Not For New Designs," making identification of equivalent and substitute components essential for ongoing production support, legacy system maintenance, and design flexibility.

Substiute Parts

TPS40140RHHT

Texas InstrumentsIn Stock: 2199TPS40140RHHT Datasheet

Current PartRFQ

TPS40322RHBT

Texas InstrumentsIn Stock: 1435TPS40322RHBT Datasheet

MFR RecommendedRFQ

TPS40140RHHR

Texas InstrumentsIn Stock: 16461TPS40140RHHR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TPS40140RHHT is determined by alignment across the following critical parameters:

Parametric Equivalent Criteria:

• Identical package type (36-VFQFN Exposed Pad)
• Matching output configuration (positive, step-down, 2-phase)
• Compatible supply voltage range (4.5V ~ 15V minimum)
• Switching frequency overlap (150kHz ~ 1MHz)
• Synchronous rectifier capability
• Identical control features (Current Limit, Frequency Control, Phase Control, Power Good, Tracking)
• Operating temperature range (-40°C ~ 85°C minimum)

Functional Substitute Criteria:

• Same topology (buck regulator controller)
• Transistor driver output type
• Two-phase output capability
• Supply voltage compatibility
• Synchronous rectification support
• Compliance certifications (ROHS3, REACH Unaffected)

Two substitute parts are identified: TPS40140RHHR (parametric equivalent) and TPS40322RHBT (functional substitute with enhanced specifications).

Parameter Comparison

Engineering Selection Recommendations

TPS40140RHHR (Parametric Equivalent): This part is a direct parametric equivalent with identical electrical specifications, control features, and package configuration. It maintains the same supply voltage range (4.5V ~ 15V), switching frequency band (150kHz ~ 1MHz), duty cycle maximum (87.5%), and operating temperature range (-40°C ~ 85°C). Both parts share "Not For New Designs" status and identical compliance certifications (ROHS3, REACH Unaffected). Selection of TPS40140RHHR is appropriate for direct replacement in existing designs without circuit modification. Higher inventory availability (16,451 pcs vs. 2,100 pcs) may provide supply chain advantages.

TPS40322RHBT (Functional Substitute): This part functions as a substitute with enhanced specifications suitable for applications requiring extended operating temperature range (-40°C ~ 125°C junction temperature vs. -40°C ~ 85°C ambient) or wider supply voltage tolerance (3V ~ 20V vs. 4.5V ~ 15V). The TPS40322RHBT includes clock synchronization capability and soft start control features not present in the TPS40140RHHT. The package is smaller (32-VFQFN 5x5 vs. 36-VFQFN 6x6), requiring PCB layout redesign. This part carries "Active" product status, supporting long-term availability for new designs. Selection requires verification of pin compatibility and control feature integration into existing firmware or analog control circuits.

Frequently Asked Questions (FAQ)

Q: Can TPS40140RHHR be used as a direct drop-in replacement for TPS40140RHHT?

A: Yes. TPS40140RHHR is a parametric equivalent with identical package (36-VFQFN 6x6), electrical specifications, and control features. No circuit modifications are required for direct substitution.

Q: What are the key differences between TPS40140RHHT and TPS40322RHBT?

A: The primary differences are package size (36-VFQFN 6x6 vs. 32-VFQFN 5x5), supply voltage range (4.5V ~ 15V vs. 3V ~ 20V), operating temperature range (-40°C ~ 85°C vs. -40°C ~ 125°C), and additional control features (clock sync and soft start in TPS40322RHBT). The TPS40322RHBT has "Active" product status versus "Not For New Designs" for TPS40140RHHT.

Q: Is TPS40322RHBT compatible with existing TPS40140RHHT PCB layouts?

A: No. The TPS40322RHBT uses a smaller 32-VFQFN (5x5) package compared to the 36-VFQFN (6x6) package of TPS40140RHHT. PCB layout redesign is required, including trace routing and thermal management modifications.

Q: Which substitute part should be selected for new designs?

A: TPS40322RHBT is recommended for new designs due to its "Active" product status, extended operating temperature range, and wider supply voltage tolerance. TPS40140RHHT and TPS40140RHHR are classified as "Not For New Designs."

Q: Are all three parts ROHS3 compliant?

A: Yes. TPS40140RHHT, TPS40140RHHR, and TPS40322RHBT are all ROHS3 compliant with identical moisture sensitivity level (MSL 2, 1 Year) and REACH unaffected status.

Q: What is the minimum supply voltage requirement for each part?

A: TPS40140RHHT and TPS40140RHHR require 4.5V minimum supply voltage. TPS40322RHBT operates at 3V minimum, providing lower voltage application support.

Q: Do all parts support synchronous rectification?

A: Yes. All three parts (TPS40140RHHT, TPS40140RHHR, and TPS40322RHBT) include integrated synchronous rectifier capability for improved efficiency in buck topology applications.