1EDN7126UXTSA1 vs FAD7191M1X: High-Side Gate Driver IC Comparison

Quick verdict

For single high-side GaN MOSFET driving in applications with moderate voltage (up to 200 V) and simple driver needs, the 1EDN7126UXTSA1 is preferable due to its focused design and GaN compatibility. For more complex half-bridge topologies requiring both high-side and low-side drive, higher voltage capability (up to 600 V), and automotive-grade reliability, the FAD7191M1X offers a more versatile and rugged solution.

Spec comparison table

Spec1EDN7126UXTSA1FAD7191M1XNotes
Driven configurationHigh-SideHigh-Side, Low-SideFAD7191M1X supports half-bridge with both drivers, increasing design flexibility.
Number of drivers12FAD7191M1X can drive both legs, reducing component count in half-bridge designs.
Gate typeGaN FET, MOSFET (N-Channel)IGBT, MOSFET (N-Channel)1EDN7126UXTSA1 explicitly supports GaN, critical for fast switching applications.
High-side voltage max bootstrap200 V600 VFAD7191M1X supports triple the voltage, suitable for higher voltage systems.
Current peak output (source/sink)Not specified4.5 A / 4.5 AFAD7191M1X offers strong drive current, beneficial for fast switching and large gates.
Input typeNot specifiedNon-InvertingFAD7191M1X input logic levels defined, aiding interface design.
Logic voltage (V_IL, V_IH)Not specified1.2 V (V_IL), 2.5 V (V_IH)FAD7191M1X provides clear input thresholds, easing MCU/FPGA interfacing.
Operating temperature rangeNot specified-40°C to 125°C (TA)FAD7191M1X supports automotive-grade temperature, better for harsh environments.
Package caseNot specified14-SOIC (3.90 mm width)FAD7191M1X package known; 1EDN7126UXTSA1 package details missing, likely smaller/specialized.
Mounting typeNot specifiedSurface MountFAD7191M1X confirmed SMD, standard for mass production.
Rise/fall time (typical)Not specified25 ns / 25 nsFAD7191M1X switching speed specified, useful for timing-sensitive designs.
QualificationNot specifiedAEC-Q100FAD7191M1X is automotive qualified, suitable for safety-critical applications.
Voltage supply rangeNot specified10 V to 22 VFAD7191M1X supports wide supply range, easing power supply design.
Digikey programmableNot verifiedNot verifiedNeither part is listed as programmable on Digikey.

Design trade-offs

The 1EDN7126UXTSA1 is a single-channel high-side driver optimized for GaN and N-channel MOSFETs, with a maximum bootstrap voltage of 200 V. This makes it a natural fit for mid-voltage GaN applications such as point-of-load converters or battery-powered systems where voltage rails do not exceed 200 V. Its datasheet absence of detailed output current and switching speed specs suggests it targets a niche where the transistor gate is small (GaN typically has low gate charge) and switching transitions can be managed without excessive drive strength.

In contrast, the FAD7191M1X is a dual independent high-side/low-side driver with a robust 600 V bootstrap rating, peak output currents of 4.5 A both sourcing and sinking, and a defined 25 ns rise/fall time. These features indicate suitability for high-voltage half-bridge topologies, including motor drives and automotive traction inverters. Its automotive qualification (AEC-Q100) and extended temperature range (-40°C to 125°C) further align it with harsher environments and demanding reliability targets.

From a layout perspective, the FAD7191M1X’s dual-channel driver reduces the need for a separate low-side driver IC, simplifying board complexity and potentially reducing BOM cost and assembly steps. The higher peak current output facilitates faster switching transitions, which can reduce switching losses at high frequencies but requires careful PCB layout to handle transient currents and minimize EMI.

The 1EDN7126UXTSA1’s lack of detailed package and current specs requires engineers to validate thermal dissipation and switching performance experimentally, especially when pushing switching speeds or driving larger MOSFETs. Its focus on GaN FETs implies an emphasis on low gate charge and fast switching but at voltages below 200 V, limiting its use in higher voltage or complex half-bridge systems.

In terms of supply voltages, the FAD7191M1X’s wide 10 V to 22 V range offers design flexibility, especially for systems with variable or noisy supply rails, while the 1EDN7126UXTSA1’s supply voltage is unspecified but likely narrower, given its bootstrap voltage limit.

Cost considerations at volume will depend heavily on packaging, qualification, and channel count. The FAD7191M1X’s automotive grade and dual driver likely command a higher price than the presumably simpler 1EDN7126UXTSA1, but the integration and voltage rating can offset system-level costs.

Use-case fit

Choose 1EDN7126UXTSA1 when…

Choose FAD7191M1X when…

Drop-in compatibility

Based on the available data, the 1EDN7126UXTSA1 and FAD7191M1X are not pin-compatible or footprint-compatible. The FAD7191M1X is a 14-SOIC dual-channel driver, whereas the 1EDN7126UXTSA1’s package details are unspecified, and it is a single-channel device. Substituting one for the other will require board layout changes, including different pin assignments, power supply routing, and potentially different bootstrap circuitry. Additionally, the FAD7191M1X supports both high-side and low-side driving, so wiring and control signals differ substantially.

Alternatives to consider