UM6K33NTN vs STSPIN220: Component Comparison for Hardware Engineers

Quick verdict

For simple low-current switching or level-shifting applications requiring minimal board area and straightforward MOSFET arrays, the UM6K33NTN is the better choice due to its small package, logic-level drive, and low gate capacitance. For integrated bipolar stepper motor driver applications requiring higher current capability, microstepping, and built-in control logic, the STSPIN220 is superior, offering a fully integrated half-bridge driver with 1.3A output and advanced step/direction interface.

Spec comparison table

SpecUM6K33NTNSTSPIN220Notes
Configuration2 N-Channel MOSFET (Dual)4 Half-Bridge outputs (integrated)STSPIN220 integrates driver and power stage; UM6K33NTN is a bare MOSFET array.
Continuous Drain Current @ 25°C200mA1.3ASTSPIN220 supports significantly higher current, enabling more demanding motor loads.
Maximum Drain-Source Voltage (Vds)50V10V (load voltage range 1.8–10V)UM6K33NTN supports higher voltage; STSPIN220 optimized for low-voltage motor drives.
FET FeatureLogic Level Gate, 1.2V DrivePower MOSFET with integrated driverUM6K33NTN requires external gate drive; STSPIN220 includes gate drive circuitry.
Gate Charge (Qg)Not specifiedNot specifiedInsufficient data to compare gate drive losses directly.
Input Capacitance (Ciss)25pF @ 10VNot specifiedUM6K33NTN’s low input capacitance reduces gate drive power and switching losses.
Mounting TypeSurface Mount (6-TSSOP, SC-88, SOT-363)Surface Mount (16-VFQFN 3x3mm)Both surface mount; STSPIN220 larger package due to integrated driver.
Operating Temperature RangeUp to 150°C (TJ)-40°C to 150°C (TJ)STSPIN220 supports wider ambient range including cold environments.
Maximum Power Dissipation120mWNot specifiedUM6K33NTN’s low power rating limits continuous dissipation; STSPIN220 power rating not given explicitly.
Rds(on) @ 200mA, Vgs=4.5V2.2ΩNot specifiedUM6K33NTN’s Rds(on) is high, limiting conduction efficiency and max current.
Gate Threshold Voltage (Vgs_th)1V @ 1mANot specifiedUM6K33NTN suitable for logic-level drive; STSPIN220 gate threshold details not given.
Supplier Device PackageUMT6 (6-pin)16-VFQFN (3x3mm)UM6K33NTN smaller footprint; STSPIN220 package accommodates integrated control logic.
TechnologyMOSFET (Metal Oxide)Power MOSFET + integrated driverSTSPIN220 includes control logic and power stage; UM6K33NTN is discrete MOSFET array.
ApplicationGeneral MOSFET arrayBipolar stepper motor driverSTSPIN220 targeted at motor control; UM6K33NTN for generic switching or level shifting.
InterfaceN/AStep/DirectionSTSPIN220 includes motor control interface; UM6K33NTN is a passive component.

Design trade-offs

The UM6K33NTN is a simple, dual N-channel MOSFET array optimized for low-voltage logic-level drive applications where switching currents do not exceed 200mA. Its low input capacitance (25pF) and 1.2V logic-level gate drive capability allow for low gate drive power consumption and easy interfacing with low-voltage logic. However, its high Rds(on) of 2.2Ω at 200mA and 4.5V gate drive limits conduction efficiency and makes it unsuitable for higher current loads. Thermal dissipation is also limited to 120mW, necessitating careful derating or external heat sinking in designs with continuous conduction.

In contrast, the STSPIN220 integrates four half-bridge power MOSFETs and a full driver stage optimized for bipolar stepper motors. It supports continuous output currents up to 1.3A, a significant step up from the UM6K33NTN’s 200mA rating, and offers microstepping with >256 microsteps resolution. Its integrated driver simplifies PCB layout by removing the need for discrete gate drive components and reduces firmware complexity by providing a step/direction interface. The 16-pin VFQFN package is larger but accommodates the additional control logic and thermal pad, which aids heat dissipation at higher currents.

From a layout perspective, the UM6K33NTN’s small 6-pin package is ideal for dense, low-power designs but requires external gate drive and possibly additional protection circuitry. The STSPIN220 demands a larger PCB footprint and careful thermal management due to its higher power dissipation but reduces component count and BOM complexity. The STSPIN220’s fixed voltage supply range (0–5V) and load voltage range (1.8–10V) make it unsuitable for higher voltage applications where the UM6K33NTN’s 50V rating would be necessary.

Cost-wise, the UM6K33NTN will generally be cheaper per unit due to its simpler construction and smaller package, especially in volume. However, the STSPIN220’s integration of driver and power stage can reduce overall system cost and complexity in motor driver applications, making it more economical in that context.

Use-case fit

Choose UM6K33NTN when…

Choose STSPIN220 when…

Drop-in compatibility

These parts are not pin- or footprint-compatible. The UM6K33NTN comes in a 6-pin UMT6 package designed as a discrete dual MOSFET array, whereas the STSPIN220 is a fully integrated 16-pin VFQFN IC with half-bridge outputs and control logic. Substituting one for the other would require a complete redesign of the PCB footprint, power delivery, and control interface. The UM6K33NTN requires external gate drive signals and separate control logic, while the STSPIN220 includes built-in gate drivers and a step/direction interface, making their electrical and mechanical substitution infeasible without redesign.

Alternatives to consider