UM6K33NTN vs A4915MLPTR-T: Component Comparison for Power Electronics Engineers
Quick verdict
For low-current, general-purpose switching applications requiring simple dual N-channel MOSFETs with logic-level drive, the UM6K33NTN is preferable due to its low gate threshold and compact dual MOSFET format. For integrated motor driver applications, particularly brushless DC (BLDC) control with built-in pre-driver functionality, the A4915MLPTR-T is the better choice, offering a complete power stage solution rather than just discrete MOSFETs.
Spec comparison table
| Spec | UM6K33NTN | A4915MLPTR-T | Notes |
|---|---|---|---|
| Configuration | 2 N-Channel (Dual MOSFET) | Integrated Power MOSFET Parallel with Pre-Driver | UM6K33NTN is discrete MOSFET array; A4915MLPTR-T includes controller and MOSFETs |
| Continuous Drain Current @ 25°C | 200 mA | Not specified | UM6K33NTN max current explicitly given; A4915MLPTR-T intended for higher power but no direct rating |
| Max Drain-Source Voltage (Vds) | 50 V | 5 V ~ 50 V | Both support up to 50 V maximum; A4915MLPTR-T supports wide load voltage range |
| FET Feature | Logic Level Gate, 1.2 V Drive | Power MOSFET with integrated driver | UM6K33NTN logic level means gate fully enhanced at 1.2 V; A4915MLPTR-T includes gate drive circuitry |
| Gate Charge (Qg) | Not specified | Not specified | No data; gate charge affects switching losses and driver selection |
| Input Capacitance (Ciss) | 25 pF @ 10 V | Not specified | UM6K33NTN low input capacitance aids switching speed and reduces driver load |
| Mounting Type | Surface Mount (UMT6, 6-TSSOP, SC-88, SOT-363) | Surface Mount (28-TSSOP-EP) | UM6K33NTN uses smaller package; A4915MLPTR-T requires more PCB area |
| Operating Temperature Range | Up to 150°C (TJ) | -20°C to 150°C (TJ) | A4915MLPTR-T specified over wider ambient range including low temp |
| Max Power Dissipation | 120 mW | Not specified | UM6K33NTN limited power dissipation indicates low power application |
| Rds(on) Max @ 200 mA, 4.5 V Vgs | 2.2 Ω | Not specified | UM6K33NTN’s on-resistance is high, limiting efficiency at higher current |
| Package Case | UMT6 (6-pin) | 28-TSSOP with Exposed Pad | Larger package on A4915MLPTR-T supports thermal dissipation |
| Technology | MOSFET (Metal Oxide) | Power MOSFET integrated with pre-driver | A4915MLPTR-T is a power stage IC, not just MOSFETs |
| Vgs Threshold Max @ Id=1mA | 1 V | Not specified | Low threshold on UM6K33NTN benefits low-voltage logic drive |
| Function | Discrete MOSFET Array | Controller - Commutation, Direction Management | Only A4915MLPTR-T includes control logic for motor commutation |
| Interface | N/A | Parallel | A4915MLPTR-T supports parallel interface for motor control |
| Motor Type | N/A | Brushless DC (BLDC) | A4915MLPTR-T is targeted at BLDC motor control |
| Voltage Supply | N/A | 3 V ~ 5.5 V | A4915MLPTR-T requires regulated low-voltage supply to operate |
Design trade-offs
The UM6K33NTN is essentially a dual discrete N-channel MOSFET array optimized for low-voltage, low-current switching with a logic-level gate threshold near 1 V. Its on-resistance at 200 mA (2.2 Ω) and maximum power dissipation of 120 mW indicate it is designed for signal-level or low-power switching rather than power conversion or motor driving. The small 6-pin UMT6 package facilitates PCB space savings and simple integration into compact circuits but limits thermal dissipation and current capability.
In contrast, the A4915MLPTR-T is a motor driver power stage IC rather than a discrete MOSFET array. It integrates multiple power MOSFETs with pre-driver circuitry aimed at BLDC motor commutation and direction management. The 28-TSSOP-EP package includes an exposed pad for improved thermal performance, supporting higher power dissipation than the UM6K33NTN can handle. The integrated controller and parallel interface simplify firmware design by offloading commutation logic, but at the cost of increased PCB footprint and complexity.
Thermally, the UM6K33NTN’s 120 mW max power dissipation restricts its use to low current or signaling roles. Its relatively high Rds(on) at 200 mA means conduction losses rise quickly with current, making it unsuitable for high-efficiency power stages. The A4915MLPTR-T’s lack of explicit current and Rds(on) specs in the provided data complicates direct efficiency comparison, but its package and function imply it supports significantly higher currents typical for motor drives.
Gate drive considerations favor the UM6K33NTN in simple logic-level applications due to its 1.2 V drive capability and low gate threshold of 1 V at 1 mA. This allows direct drive from low-voltage logic without additional gate drive circuitry. The A4915MLPTR-T requires a 3 V to 5.5 V supply and includes internal gate drivers, reducing external component count but fixing the power supply and interface requirements.
From a layout perspective, the UM6K33NTN’s small 6-pin package simplifies routing but provides limited heat sinking, constraining continuous power dissipation. The A4915MLPTR-T’s larger 28-pin TSSOP with exposed pad demands more PCB area but enables better thermal management and integration of control signals, reducing overall component count.
Cost at volume will generally favor the UM6K33NTN for applications needing only simple switching MOSFETs due to its simpler construction and smaller package. The A4915MLPTR-T’s integrated control and power stage functionality justify a higher cost but reduce BOM complexity and firmware development effort for motor control applications.
Use-case fit
Choose UM6K33NTN when…
- Designing low-current, low-voltage switching circuits requiring dual N-channel MOSFETs in a compact surface mount package.
- Logic-level gate drive is needed directly from 1.2 V or 3.3 V microcontroller outputs without gate driver ICs.
- The application involves signal-level switching, level shifting, or low-power load switching with a maximum current around 200 mA.
- PCB space is very constrained and minimal thermal dissipation is required.
- The design demands a simple, discrete MOSFET array without integrated control logic.
Choose A4915MLPTR-T when…
- Building a BLDC motor driver requiring integrated pre-driver MOSFETs with commutation and direction management.
- Higher current and power dissipation capability is necessary beyond what small discrete MOSFET arrays can provide.
- The design benefits from integrated control logic, reducing firmware complexity and external components.
- Thermal management is critical and the exposed pad TSSOP package can be leveraged for heat sinking.
- The system uses a 3 V to 5.5 V supply rail and can accommodate a larger PCB footprint for a fully integrated motor driver stage.
Drop-in compatibility
There is no indication that the UM6K33NTN and A4915MLPTR-T are pin-compatible or footprint-compatible. The UM6K33NTN is a small 6-pin MOSFET array in a compact UMT6 package, while the A4915MLPTR-T is a much larger 28-pin TSSOP with an exposed pad, integrating both MOSFETs and control logic. Substituting one for the other would require a complete redesign of the PCB layout and firmware. The UM6K33NTN cannot replace the A4915MLPTR-T where integrated motor control is required, and the A4915MLPTR-T cannot replace the UM6K33NTN for simple discrete MOSFET switching tasks.
Alternatives to consider
- BSS138 (NXP): A logic-level N-channel MOSFET in a small SOT-23 package, suitable for low-current switching similar to UM6K33NTN but with a single transistor.
- IRLML2502 (Infineon): Low-voltage N-channel MOSFET with low Rds(on) and logic-level gate drive, ideal for low-voltage, low-power switching applications.
- DRV8301 (Texas Instruments): A fully integrated 3-phase BLDC motor driver IC with gate drivers and control logic, offering a more advanced alternative to the A4915MLPTR-T for motor control applications.