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Alternatives to Texas Instruments LM5126AQRHBRQ1

Texas Instruments LM5126AQRHBRQ1 and its qualified second sources, compared on form, fit and function, stock, lifecycle and price — the same checks Parter runs inside a BOM.

Equivalent and substitute parts for Texas Instruments LM5126AQRHBRQ1

LM5126AQRHBRQ1 compared against its qualified second sources
LM5126AQRHBRQ1Texas InstrumentsLM51261AQRHBRQ1Texas InstrumentsLM5125AQRHBRQ1Texas Instruments+2more
FFF CompatibilityUses the same 32-VQFN package, but the pinout is modified to accommodate the I2C interface (SDA/SCL on pins 25 and 26, nFAULT on pin 28) instead of the analog configuration and power-good pins on the LM5126A.Identical physical package type, dimensions, and wettable flanks (32-VQFN, 5mm x 5mm).Equivalent electrical parameters (voltage, frequency, and tracking capabilities) with the addition of digital control features.Shares the same package, but utilizes several NC pins on the LM5126A (pins 14-17 and 20-21) for phase-2 driver outputs and sensing, requiring layout trace checks.Identical 32-VQFN 5mm x 5mm package with matching mechanical dimensions.Fully covers the electrical performance, voltage ranges, and switching frequency of the target while offering dual-phase capability.
AI Summary

LM5126AQRHBRQ1 by Texas Instruments: Boost Regulator Positive Output Step-Up DC-DC Controller IC 32-VQFN (5x5).

The LM51261AQRHBRQ1 is the I2C-enabled sibling of the LM5126A, sharing the same physical 32-VQFN footprint and identical electrical ratings. However, because it replaces analog configuration and power-good pins with I2C data (SDA) and clock (SCL) pins, it is a partial fit replacement requiring schematic and minor layout verification.

  • Same physical package size (32-VQFN, 5x5mm)
  • Identical input voltage range (4.5V to 42V) and output voltage range (6V to 60V)
  • Adds I2C interface support for digital programming and diagnostic feedback
  • Requires software overhead to initialize and manage the controller over I2C if digital mode is used
  • Pinout is not directly drop-in compatible due to serial interface and fault pin reassignments

The LM5125AQRHBRQ1 is the dual-phase sibling in the same controller family and package footprint. It can easily be configured for single-phase operation, but because it exposes the second phase gate drivers and sense inputs on pins that are non-connected (NC) on the LM5126A, the PCB layout must be reviewed.

  • Identical package footprint (32-VQFN, 5x5mm) simplifying layout reuse
  • Can be used in single-phase or upgraded to dual-phase operation
  • Matches all primary input, output, and frequency ratings of the target part
  • Slightly higher unit cost due to dual-phase capability
  • Requires careful board layout verification to ensure previously unused NC pins do not clash with Phase 2 connections
Lifecycle StatusActiveActiveActive
Market AvailabilityIn stockIn stockNon-stock
REACHREACHREACHUnknown
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