A89103KEVSR-3 vs 1EDN9550BXTSA1: Floating and High-/Low-Side Gate Driver ICs Compared

Quick verdict

For three-phase motor drive or automotive powertrain applications requiring integrated floating high-side drivers with AEC-Q100 qualification and operation up to 85 V, the Allegro A89103KEVSR-3 is the clear choice. For single-channel, very high peak current drive of discrete MOSFETs or SiC MOSFETs in industrial or power conversion boards with tight switching speed demands and bootstrap voltages up to 400 V, the Infineon 1EDN9550BXTSA1 offers superior drive strength and flexibility.

Spec comparison table

SpecA89103KEVSR-31EDN9550BXTSA1Notes
Channel type3-PhaseSingleA89103KEVSR-3 integrates 3 drivers, suited for multi-phase systems; 1EDN9550BXTSA1 is single-channel.
Current peak output source/sinkNot specified5.2 A / 9.4 A1EDN9550BXTSA1 has explicitly specified high peak drive currents, better for fast MOSFET switching.
Driven configurationFloatingHigh-Side, Low-SideA89103KEVSR-3 supports floating high-side drive, critical for bootstrap floating half-bridge designs.
Gate typeN-Channel MOSFETN-Channel MOSFET, SiC MOSFET1EDN9550BXTSA1 supports SiC MOSFETs natively, important for wide bandgap device drive.
GradeAutomotiveNot explicitly automotive gradeA89103KEVSR-3 is AEC-Q100 qualified, better for automotive/system reliability requirements.
Input typeNon-InvertingInverting, Non-Inverting1EDN9550BXTSA1 supports both polarities, offering more input logic flexibility.
Logic voltage (V_IL, V_IH)0.8 V / 2 VNot specifiedA89103KEVSR-3 specifies logic thresholds, aiding interface design; 1EDN9550BXTSA1 omits this.
Mounting typeSurface mount, wettable flankSurface mountWettable flanks on A89103KEVSR-3 improve assembly inspection and reliability.
Number of drivers32A89103KEVSR-3 supports 3 drivers in one IC, reducing BOM for 3-phase systems.
Operating temperature range-40 °C to 150 °C (TA)-40 °C to 150 °C (TJ)Both rated to same max temperature, but A89103KEVSR-3 spec is ambient; 1EDN9550BXTSA1 at junction.
Package case28-VFQFN Exposed PadSOT-23-6A89103KEVSR-3 QFN package supports better thermal dissipation.
QualificationAEC-Q100Not specifiedA89103KEVSR-3 is automotive qualified, critical for automotive applications.
Rise/fall time (typical)1.2 µs / 150 ns1 ns / 1 ns1EDN9550BXTSA1 has orders-of-magnitude faster switching edges, relevant for high-frequency switching and SiC MOSFETs.
Supplier device package28-QFN (6x6 mm)PG-SOT23-6-3A89103KEVSR-3 is larger, better for heat; 1EDN9550BXTSA1 smaller, for compact designs.
Voltage supply4.5 V to 85 V4.5 V to 20 VA89103KEVSR-3 supports much higher supply voltage, enabling direct drive in high-voltage systems.
High-side max bootstrap voltageNot specified400 V1EDN9550BXTSA1 supports very high bootstrap voltages, suited for high-voltage power stages.

Design trade-offs

The A89103KEVSR-3 integrates three floating drivers optimized for 3-phase applications such as automotive motor drives or industrial inverters. Its ability to operate up to 85 V supply voltage extends its use into battery pack voltages and higher-voltage DC bus systems without additional level shifting. The wettable flank 28-QFN package with exposed pad facilitates better thermal management, important given the sustained current loads in motor control. However, its switching speed, particularly the 1.2 µs typical rise time, is relatively slow, limiting its suitability for very high-frequency switching or fast SiC MOSFET gate drive applications.

In contrast, the 1EDN9550BXTSA1 is a dual-channel driver with both high-side and low-side outputs, capable of driving standard N-channel MOSFETs and SiC MOSFETs with peak source and sink currents of 5.2 A and 9.4 A respectively. The extremely fast rise and fall times (~1 ns) support rapid switching transitions, minimizing switching losses and enabling operation in high-frequency power conversion designs. Its maximum bootstrap voltage rating of 400 V allows direct interface with half-bridge stages in high-voltage DC-DC conversion or motor drives. The downside is its limited supply voltage range (up to 20 V), restricting its direct use in higher-voltage automotive battery environments without additional circuitry.

From a layout perspective, the A89103KEVSR-3’s integrated 3-phase driver reduces component count and PCB complexity but requires careful attention to routing and thermal dissipation due to higher power density. The 1EDN9550BXTSA1’s small SOT-23 package favors compact designs but may need more robust thermal management strategies, especially when operating near peak drive currents.

Cost-wise, the A89103KEVSR-3 likely carries a premium due to automotive qualification and integration level, while the 1EDN9550BXTSA1 might be less expensive per unit but could increase BOM cost if multiple channels are required.

Firmware and input logic considerations also differ: A89103KEVSR-3 is strictly non-inverting with defined logic thresholds, simplifying interface design but limiting flexibility. The 1EDN9550BXTSA1 supports both inverting and non-inverting inputs, enabling more complex control schemes or polarity adaptation.

Use-case fit

Choose A89103KEVSR-3 when…

Choose 1EDN9550BXTSA1 when…

Drop-in compatibility

These two devices are not pin- or footprint-compatible. The A89103KEVSR-3 is a 28-pin QFN package designed for three-phase floating gate drive, while the 1EDN9550BXTSA1 comes in a 6-pin SOT-23 package targeting single or dual channel high-side/low-side drive. Substituting one for the other would require significant redesign of the PCB, gate drive circuits, and firmware input logic. No direct drop-in substitution is possible.

Alternatives to consider