TPS40140RHHRG4 Equivalent & Substitute Parts

Part Overview

The TPS40140RHHRG4 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 currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and production requirements.

Substiute Parts

TPS40140RHHRG4

Texas InstrumentsIn Stock: 1512TPS40140RHHRG4 Datasheet

Current PartRFQ

TPS40322RHBR

Texas InstrumentsIn Stock: 47327TPS40322RHBR Datasheet

MFR RecommendedRFQ

TPS40140RHHR

Texas InstrumentsIn Stock: 16461TPS40140RHHR Datasheet

Parametric EquivalentRFQ

TPS40140RHHT

Texas InstrumentsIn Stock: 2199TPS40140RHHT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPS40140RHHRG4 is determined by the following critical parameters:

Package Compatibility: The 36-VFQFN (6x6) exposed pad package is the primary constraint for direct parametric equivalents. Pin count, pitch, and thermal characteristics must match for PCB-level compatibility without redesign.

Electrical Specifications: Supply voltage range (4.5V ~ 15V), switching frequency capability (150kHz ~ 1MHz), duty cycle maximum (87.5%), and control feature set (Current Limit, Frequency Control, Phase Control, Power Good, Tracking) define functional equivalence.

Topology & Output Configuration: Two-phase positive output buck topology with synchronous rectification capability must be maintained.

Product Status Consideration: The main part is discontinued. Parametric equivalents maintain identical specifications but may have different product lifecycle status. The manufacturer-recommended substitute offers enhanced capabilities with different packaging.

Substitute parts are grouped into two categories:

1. Parametric Equivalents (TPS40140RHHR, TPS40140RHHT): Identical electrical specifications and 36-VQFN package; differ only in product status and packaging format.

2. Manufacturer-Recommended Substitute (TPS40322RHBR): Enhanced specifications with different package (32-VQFN), wider supply voltage range, and active product status; requires PCB redesign due to package change.

Parameter Comparison

Engineering Selection Recommendations

For Direct PCB Replacement (No Layout Changes):

Select TPS40140RHHR or TPS40140RHHT. Both maintain identical electrical specifications and 36-VQFN package footprint. TPS40140RHHR offers higher inventory availability (16,451 pcs) compared to TPS40140RHHT (2,100 pcs). Both parts carry "Not For New Designs" status but remain ROHS3 compliant with MSL 2 rating.

For New Design Implementation:

Select TPS40322RHBR as the manufacturer-recommended substitute. This part is active in product lifecycle and offers extended supply voltage range (3V ~ 20V), wider operating temperature range (-40°C ~ 125°C), and additional control features (Enable, Soft Start, Clock Sync). The 32-VQFN (5x5) package requires PCB redesign but provides superior thermal and functional characteristics. Inventory availability is substantial (47,300 pcs).

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL 2 rating, ensuring compatibility with standard manufacturing and storage requirements. No additional compliance modifications are required for substitution.

Frequently Asked Questions (FAQ)

Q: Can TPS40140RHHR or TPS40140RHHT be used as direct replacements for TPS40140RHHRG4?

A: Yes. Both parts are parametric equivalents with identical electrical specifications and 36-VQFN package dimensions. No PCB layout modifications are required. Differences exist only in product lifecycle status and packaging format (Cut Tape & Digi-Reel vs. original packaging).

Q: What is the primary difference between TPS40140RHHR and TPS40140RHHT?

A: Both are parametric equivalents with identical electrical and package specifications. The distinction is inventory availability: TPS40140RHHR has 16,451 pcs in stock, while TPS40140RHHT has 2,100 pcs. Both carry "Not For New Designs" status.

Q: Why is TPS40322RHBR classified as a manufacturer-recommended substitute rather than a parametric equivalent?

A: TPS40322RHBR uses a different package (32-VQFN 5x5 vs. 36-VQFN 6x6), requiring PCB redesign. However, it offers enhanced specifications including wider supply voltage range (3V ~ 20V vs. 4.5V ~ 15V), extended operating temperature (-40°C ~ 125°C vs. -40°C ~ 85°C), and additional control features (Clock Sync, Enable, Soft Start). It is the only active product in this substitution group.

Q: Can TPS40322RHBR be used without PCB modifications?

A: No. The 32-VQFN (5x5) package has different pin count (32 vs. 36) and footprint dimensions than the 36-VQFN (6x6) package. PCB layout redesign is required for implementation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. TPS40140RHHR, TPS40140RHHT, and TPS40322RHBR are all ROHS3 compliant with MSL 2 rating, matching the original part's compliance profile.

Q: What is the recommended substitute for new design applications?

A: TPS40322RHBR is the manufacturer-recommended substitute for new designs. It is the only active product in this group and offers enhanced specifications and superior availability. PCB redesign is required due to package change.

Q: What control features distinguish TPS40322RHBR from the TPS40140 series?

A: TPS40322RHBR adds Enable and Soft Start control features and includes Clock Sync capability. The TPS40140 series provides Power Good and Tracking features not present in TPS40322RHBR. Feature selection depends on application requirements.