UM6K33NTN vs MAX17303X+T Component Comparison
Quick verdict
For simple power switching with low current requirements (up to 200mA) and 50V rating, the UM6K33NTN MOSFET array is the straightforward choice, particularly in compact surface-mount designs requiring dual N-channel devices with logic-level gate drive. Conversely, for battery-powered systems requiring advanced lithium-ion/polymer fuel gauging, protection, and accurate state-of-charge reporting, the MAX17303X+T excels due to its integrated fuel gauge, programmable protections, and low-power I2C interface.
Spec comparison table
| Spec | UM6K33NTN | MAX17303X+T | Notes |
|---|---|---|---|
| Function | Dual N-Channel MOSFET array | 1-Cell Lithium Ion/Polymer Fuel Gauge IC | Different device classes; direct feature comparison not applicable |
| Configuration | 2 N-Channel (Dual) MOSFETs | Integrated fuel gauge with protection FETs | UM6K33NTN is discrete MOSFETs, MAX17303X+T is IC with fuel gauge and protection |
| Max Drain-Source Voltage (Vds) | 50 V | 40 V (max input voltage) | UM6K33NTN supports higher voltage margin; useful in higher voltage systems |
| Continuous Drain Current @ 25°C | 200 mA | 100 mA (max output current) | UM6K33NTN supports higher continuous current per MOSFET |
| Max Power Dissipation | 120 mW | N/A (integrated IC) | UM6K33NTN power rating applies to MOSFETs; MAX17303X+T is IC, power dissipation depends on application |
| Gate Drive Voltage | Logic Level, 1.2 V drive | Internal control (regulated 1.8V) | UM6K33NTN requires external gate drive; MAX17303X+T handles internally |
| Gate Threshold Voltage (Vgs_th) | Max 1 V @ 1 mA | Not specified (integrated device) | UM6K33NTN suitable for low-voltage logic control |
| Input Capacitance (Ciss) | 25 pF @ 10 V | N/A | UM6K33NTN switching losses depend on gate charge and capacitance |
| Max Operating Junction Temperature (TJ) | 150 °C | 85 °C (TA operating range) | UM6K33NTN can handle higher junction temps; MAX17303X+T limited to typical IC range |
| Package Type | 6-TSSOP, SC-88, SOT-363 (UMT6) | 15-WLP (1.68 x 2.45 mm) WLBGA | UM6K33NTN is small discrete MOSFET package; MAX17303X+T is a tiny WLP IC |
| Mounting Type | Surface Mount | Surface Mount | Both SMT, but different footprints |
| IC Current Consumption (typical) | N/A (discrete MOSFET) | 24 μA active, 18 μA hibernate, 5 μA ship, 0.5 μA deepship | MAX17303X+T designed for low power battery applications |
| Interface | None (MOSFETs) | I2C | MAX17303X+T supports external communication for fuel gauge data |
| Battery Chemistry Support | N/A | Lithium Ion/Polymer | MAX17303X+T supports specific battery chemistries with calibration |
| Number of Cells Supported | N/A | 1 cell | MAX17303X+T optimized for single cell systems |
| Protection Features | None | Over Current, Over Temperature, Over Voltage, Short Circuit | MAX17303X+T integrates multiple programmable protections |
| Switching Frequency | N/A | 500 kHz min, 2 MHz typ, 5 MHz max | MAX17303X+T switching regulator frequency; UM6K33NTN is passive MOSFET array |
| Operating Temperature Range | Up to 150 °C (TJ) | -40 °C to +85 °C (TA) | UM6K33NTN can tolerate wider temperature range |
| Power Management Features | None | Fuel gauge algorithm (ModelGauge m5), SHA-256 Authentication | MAX17303X+T includes advanced battery management and security |
| Package Pitch | N/A | 0.5 mm | MAX17303X+T is fine-pitch WLP |
| Memory Size (bytes) | N/A | ~122 bytes user memory | For configuration and logging in MAX17303X+T |
| Absolute Max Input Voltage | 50 V | 40 V | UM6K33NTN has higher voltage rating |
| Absolute Max Output Current | 200 mA | 100 mA | UM6K33NTN supports higher current |
| Quiescent Current (Typical) | N/A | 24 μA active | Relevant for battery-powered systems |
| Deep Sleep Current | N/A | 0.5 μA typical | Important for long battery shelf life |
| Communication Protocol | None | I2C or Maxim 1-Wire | MAX17303X+T requires communication interface |
| Protection Register Configurability | N/A | Programmable thresholds for voltage, current, temperature | MAX17303X+T configurable for system-specific protections |
| Package Size | 6-TSSOP / SC-88 / SOT-363 | 1.68 x 2.45 mm WLP | MAX17303X+T smaller footprint but more complex assembly |
| Gate Charge (Qg) | Not specified | N/A | UM6K33NTN gate charge affects switching losses |
Design trade-offs
The UM6K33NTN is a dual N-channel MOSFET array designed for discrete switching applications up to 50V and 200mA continuous current. It requires an external gate drive signal, typically logic-level compatible with a minimum 1.2V drive voltage. The low input capacitance (25 pF at 10V) and logic-level gate threshold (max 1V) make it suitable for switching at moderate frequencies with low gate drive losses. Its maximum junction temperature rating of 150°C provides thermal headroom for applications with limited cooling or elevated ambient conditions, provided power dissipation stays within the 120mW limit. The discrete nature of these MOSFETs allows flexibility in layout and parallel configurations but demands careful consideration of gate drive timing and switching losses.
By contrast, the MAX17303X+T is a highly integrated fuel gauge IC with embedded protection FETs and battery management functions targeting single-cell lithium-ion/polymer batteries. It operates within a maximum input voltage of 40V and supports output currents up to 100mA, which is significantly less than the UM6K33NTN’s rating. The device includes a ModelGauge m5 fuel gauge algorithm with temperature and load compensation, programmable protection thresholds (overcurrent, overvoltage, undervoltage, overtemperature), and security features like SHA-256 authentication. Its low quiescent currents (down to 0.5 μA in deep sleep) make it ideal for battery-powered applications requiring long standby times and accurate state-of-charge monitoring. The I2C interface facilitates integration with host microcontrollers but requires firmware support and a more complex PCB layout due to the fine-pitch 15-WLP package.
From a thermal standpoint, the UM6K33NTN requires careful board design to dissipate up to 120mW per MOSFET under continuous load, with attention to junction-to-ambient thermal resistance. The MAX17303X+T, being an IC with integrated FETs and protections, abstracts these concerns but operates within stricter temperature limits (max 85°C ambient). The MAX17303X+T’s internal power path MOSFETs are optimized for battery protection rather than high-current switching, and its switching frequency range (500 kHz to 5 MHz) impacts power conversion efficiency and EMI considerations in system design.
Cost-wise, the UM6K33NTN as a discrete MOSFET array is likely lower cost at volume and simpler to source, but requires additional components and design effort for gate drive and protection functions. The MAX17303X+T, while more expensive, offers a complete integrated solution reducing BOM complexity and development time for battery management systems. Assembly complexity is higher for the MAX17303X+T due to WLP packaging and tighter layout requirements.
Use-case fit
Choose UM6K33NTN when…
- You need dual logic-level N-channel MOSFETs for low-power switching up to 50V and 200mA per channel.
- Your design requires discrete MOSFETs to control small loads or signal switching with minimal external complexity.
- High junction temperature tolerance (up to 150°C) is required for harsh environments or compact thermal designs.
- Cost sensitivity and availability favor simpler MOSFET arrays over complex ICs.
- Your system does not require integrated battery fuel gauging or protection features.
Choose MAX17303X+T when…
- Designing a single-cell lithium-ion or lithium-polymer battery pack requiring accurate fuel gauging and state-of-charge reporting.
- You require programmable protections including overcurrent, overvoltage, undervoltage, and overtemperature integrated into one device.
- Low quiescent current consumption is critical for maximizing battery life in portable or wearable applications.
- You need an I2C interface to communicate battery status, alerts, and diagnostics to a host microcontroller.
- Security features like SHA-256 authentication are necessary to prevent tampering or unauthorized battery usage.
Drop-in compatibility
The UM6K33NTN and MAX17303X+