NX3008NBKS,115 vs A4915MLPTR-T: Component Comparison for Power MOSFET and Motor Driver Applications
Quick verdict
For low-current, dual N-channel MOSFET switching tasks—especially in automotive or harsh environments—the NX3008NBKS,115 is the clear choice due to its AEC-Q101 qualification, defined gate charge, and logic-level gate drive. In contrast, for integrated brushless DC motor control requiring coordinated high-side/low-side MOSFET pre-driver functionality and wider voltage supply range, the A4915MLPTR-T is better suited, offering a dedicated motor driver IC with parallel MOSFET outputs and a more complex interface.
Spec comparison table
| Spec | NX3008NBKS,115 | A4915MLPTR-T | Notes |
|---|---|---|---|
| Product type | MOSFET Array (2 N-Channel) | Motor Driver Power MOSFET Parallel | NX3008NBKS is a discrete MOSFET array; A4915MLPTR-T is a motor driver IC with MOSFETs. |
| Maximum Drain-Source Voltage (V) | 30 V | 50 V (Load voltage range 5V–50V) | A4915 supports higher voltage, better for motors requiring up to 50 V supply. |
| Continuous Drain Current (A) | 0.35 A (350 mA) | Not specified | NX3008NBKS has low continuous current rating; A4915’s MOSFET current not explicitly given. |
| Drain Current Spiking Max (A) | 1.4 A | Not specified | NX3008NBKS can handle brief spikes up to 1.4 A. |
| On-Resistance (R_DS(on)) (Ω) | Typ 1.5 Ω @ 350mA, 4.5 V gate; max 1.4 Ω | Not specified | NX3008NBKS has relatively high R_DS(on), limiting efficiency at higher currents. |
| Gate Threshold Voltage (V) | Typ 1.75 V; min 0.5 V; max 1.1 V | Not specified | NX3008NBKS logic-level gate suitable for 4.5–8 V drive; A4915 gate threshold not given. |
| Gate Charge (Q_g) (nC) | Typ 0.52–0.68 nC @ 4.5 V | Not specified | NX3008NBKS has very low gate charge, enabling fast switching and low gate drive losses. |
| Input Capacitance (C_iss) (pF) | Typ 34–50 pF | Not specified | Lower input capacitance reduces switching losses and EMI. |
| Output Capacitance (C_oss) (pF) | Typ 6.5 pF | Not specified | Lower output capacitance benefits switching speed. |
| Reverse Transfer Capacitance (C_rss) (pF) | Typ 2.2 pF | Not specified | Lower C_rss reduces Miller effect, improving switching performance. |
| Maximum Power Dissipation (mW) | 445 mW (per device) | Not specified | NX3008NBKS limited to <0.5 W dissipation, restricting power applications. |
| Operating Temperature Range (°C) | -55 to +150 °C | -20 to +150 °C | NX3008NBKS supports wider low-temp range, important for automotive/industrial. |
| Junction Temperature Max (°C) | +150 °C | +150 °C | Both rated for high junction temperature operation. |
| Package | 6-TSSOP (2.2 mm x 1.35 mm) | 28-TSSOP-EP (4.4 mm wide) | NX3008NBKS is much smaller, suitable for space-constrained designs; A4915 larger due to integrated driver. |
| Mounting Type | Surface Mount | Surface Mount | Both surface mount, but footprint size differs significantly. |
| Electrostatic Discharge Rating (V) | 2000 V (HBM) | Not specified | NX3008NBKS offers explicit ESD rating, important for handling robustness. |
| Qualification | AEC-Q101 Automotive | Not specified | NX3008NBKS is automotive qualified; A4915 suitability for automotive unknown from data. |
| Technology | MOSFET (Metal Oxide Semiconductor) | Power MOSFET + Driver IC | NX3008NBKS is discrete MOSFETs; A4915 is integrated motor driver with MOSFETs. |
| Supply Voltage (V) | N/A (device voltage rating 30 V max) | 3 V to 5.5 V (logic supply), 5 V to 50 V load | A4915 requires separate logic supply and supports wider load voltage range. |
| Functionality | MOSFET switch array | Motor controller: commutation, direction management | A4915 includes motor control logic; NX3008NBKS is just MOSFETs. |
| Output Configuration | 2 N-Channel MOSFETs | High Side/Low Side pre-driver (3 outputs) | A4915 designed for 3-phase motor control; NX3008NBKS just dual MOSFETs. |
Design trade-offs
The NX3008NBKS,115 is a dual N-channel MOSFET array optimized for low-current switching applications in automotive or industrial environments, with a focus on ruggedness (AEC-Q101 qualification, wide temperature range down to -55 °C). Its maximum continuous drain current of 350 mA and gate charge under 1 nC make it suitable for low-power signal switching or level shifting where gate drive current and switching losses need to be minimized. However, its relatively high R_DS(on) (typ 1.5 Ω at 350 mA) limits efficiency and power dissipation, confining it to low-power use cases.
In contrast, the A4915MLPTR-T is a fully integrated motor driver IC with parallel power MOSFETs designed for brushless DC motor control. It supports a wider load voltage range (5 V to 50 V) and logic supply from 3 V to 5.5 V, enabling it to interface directly with low-voltage microcontrollers and drive motors up to 50 V. The package is much larger (28-TSSOP-EP) to accommodate the integrated gate drivers and MOSFETs, making it less suitable for compact designs but essential for motor control applications where dynamic commutation and direction management are required.
Thermal considerations differ significantly: NX3008NBKS’s maximum power dissipation is 445 mW (per device) with a high thermal resistance (typ ~300 K/W), indicating poor heat sinking capability for high current loads. It is only suitable for low-power switching with minimal thermal stress. The A4915’s datasheet does not specify explicit power dissipation or on-resistance, but as a motor driver IC designed for power MOSFETs in parallel, it likely supports much higher currents and dissipates heat more effectively via its exposed pad and larger package.
From a gate drive standpoint, NX3008NBKS requires a logic-level gate voltage (typical threshold ~1.75 V, max 1.1 V) and very low gate charge, easing drive requirements and reducing switching losses in low-voltage logic systems. The A4915 abstracts gate drive internally, simplifying firmware but requiring power and logic supplies within specified ranges.
Layout sensitivity is also a key difference. NX3008NBKS’s small 6-TSSOP package enables dense PCB layouts but demands careful thermal management and ESD protection due to limited power dissipation and lower current capability. The A4915’s larger 28-TSSOP-EP package with exposed pad facilitates heat sinking but requires more PCB area and careful power routing to handle motor currents and prevent noise coupling.
Cost-wise, the NX3008NBKS is likely lower cost per unit due to simpler die and smaller package, suitable for high-volume, low-current switching. The A4915 is a more complex IC with integrated control logic and multiple parallel MOSFETs, commanding a higher price justified by its functionality in motor drive systems.
Use-case fit
Choose NX3008NBKS,115 when…
- You need a dual low-current N-channel MOSFET array for automotive or industrial signal switching with AEC-Q101 qualification.
- Operating temperatures span from -55 °C to +150 °C and ruggedness is critical.
- The application requires minimal gate drive current and fast switching at low currents (≤350 mA).
- PCB space is limited, favoring the compact 6-TSSOP package.
- You want a discrete MOSFET solution to pair with external control logic or microcontrollers.
Choose A4915MLPTR-T when…
- Designing a brushless DC motor controller requiring integrated MOSFET drivers with commutation and direction management logic.
- Operating with motor supply voltage between 5 V and 50 V, and logic supply from 3 V to 5.5 V.
- You need a pre-driver stage with high-side and low-side MOSFET outputs in a single IC package.
- Your design tolerates a larger PCB footprint and requires higher output currents than 350 mA.
- Firmware complexity benefits from integrated motor control functions reducing external components.