UM6K33NTN vs RAJ240057A20DNP#HC1: Component Comparison for Power Electronics Engineers
Quick verdict
For low-voltage switching applications requiring dual N-channel MOSFETs with logic-level gate drive, the UM6K33NTN is the clear choice due to its optimized transistor parameters and compact UMT6 package. Conversely, for battery management and fuel gauging in 2–4 cell Li-ion/polymer packs with digital communication needs, the RAJ240057A20DNP#HC1 is the dedicated IC solution, integrating fuel gauge functionality and fault protections not found in the UM6K33NTN.
Spec comparison table
| Spec | UM6K33NTN | RAJ240057A20DNP#HC1 | Notes |
|---|---|---|---|
| Device type | Dual N-Channel MOSFET | Battery Fuel Gauge IC | Different device classes for distinct applications—MOSFET array vs integrated fuel gauge. |
| Maximum Drain-Source Voltage (V) | 50 V | Not specified (battery gauge IC) | UM6K33NTN rating relevant for switching; RAJ240057A20DNP#HC1 not specified, IC rating irrelevant. |
| Continuous Drain Current (ID) at 25°C | 200 mA | Not applicable | Only UM6K33NTN passes current; RAJ240057A20DNP#HC1 is not a transistor. |
| Maximum Power Dissipation | 120 mW | Not specified | UM6K33NTN limited by MOSFET junction; RAJ240057A20DNP#HC1 thermal limits per datasheet. |
| Gate Drive Voltage | 1.2 V Logic Level Gate | Not applicable | UM6K33NTN designed for low-voltage drive; RAJ240057A20DNP#HC1 is digital IC. |
| Input Capacitance (Ciss) at VDS=10V | 25 pF | Not applicable | Low input capacitance in UM6K33NTN aids switching speed and gate drive power. |
| On-Resistance (RDS(on)) at 4.5 V Gate | 2.2 Ω @ 200 mA | Not applicable | UM6K33NTN’s RDS(on) is high compared to power MOSFETs but acceptable for low-current switching. |
| Gate Threshold Voltage (VGS(th)) | 1 V @ 1 mA | Not applicable | UM6K33NTN logic-level threshold suitable for 1.2–4.5 V gate drive. |
| Configuration | Dual N-Channel MOSFET | Fuel Gauge IC | UM6K33NTN is discrete transistor array vs integrated fuel gauge IC in RAJ240057A20DNP#HC1. |
| Battery Chemistry Support | N/A | Lithium Ion/Polymer | RAJ240057A20DNP#HC1 targets Li-ion/polymer battery packs. |
| Fault Protection | None | Over Current, Short Circuit | RAJ240057A20DNP#HC1 includes protection features critical for battery safety. |
| Interface | N/A | I2C, UART | RAJ240057A20DNP#HC1 supports common digital interfaces for system integration. |
| Number of Cells Supported | N/A | 2 to 4 cells | RAJ240057A20DNP#HC1 designed for multi-cell battery packs. |
| Operating Temperature Range | Up to 150°C (TJ) | -40°C to 85°C (TA) | UM6K33NTN supports higher junction temps; RAJ240057A20DNP#HC1 limited by ambient temp. |
| Package | UMT6 (6-pin TSSOP, SC-88, SOT-363) | 32-pin HVQFN (4x4 mm) | UM6K33NTN is very small discrete array; RAJ240057A20DNP#HC1 is complex IC with large pin count. |
| Mounting Type | Surface Mount | Surface Mount | Both surface mount but different package sizes and footprints. |
Design trade-offs
The UM6K33NTN is a dual N-channel MOSFET array optimized for low-voltage logic-level gate drive applications, with a maximum continuous drain current of 200 mA and a relatively high on-resistance of 2.2 Ω at 4.5 V gate drive. This indicates it is suited for signal-level switching or low-power loads rather than high-current power stages. The low input capacitance (25 pF) keeps gate charge low, reducing switching losses and gate drive power, which is beneficial in battery-powered or tightly constrained designs. Its compact UMT6 package (6-pin TSSOP equivalent) aids in dense layouts but requires careful thermal management given the 120 mW power dissipation limit and minimal thermal mass.
In contrast, the RAJ240057A20DNP#HC1 is not a transistor array but a dedicated battery fuel gauge IC with integrated fault protections (overcurrent, short circuit) and digital interfaces (I2C, UART). Its functionality is entirely different, focusing on battery state monitoring for 2–4 cell Li-ion/polymer packs. The operating ambient temperature range (-40°C to 85°C) is standard for consumer battery management systems but narrower than the transistor’s junction temperature capability. The 32-pin HVQFN package is significantly larger, reflecting the complexity of the IC and its multiple functions, including on-chip measurement and processing. Thermal considerations in this IC focus on junction-to-ambient dissipation of digital logic and analog front end rather than power switching.
From a layout perspective, the UM6K33NTN’s small size and simple pinout simplify placement but require careful routing for gate drive signals and low-impedance source connections to prevent switching noise. The RAJ240057A20DNP#HC1 demands more PCB area and careful placement of bypass capacitors and I2C/UART lines to ensure reliable communication and measurement accuracy. Firmware complexity is much higher with the Renesas fuel gauge, requiring protocol handling and data interpretation, whereas the UM6K33NTN is a passive component from a firmware perspective.
Cost at volume will differ significantly due to the component classes: the UM6K33NTN is a simple discrete MOSFET array likely costing a fraction of the fuel gauge IC, which integrates complex analog and digital subsystems. BOM cost and design complexity should be balanced against system requirements: use the UM6K33NTN where simple switching is required and the RAJ240057A20DNP#HC1 where integrated battery monitoring is critical.
Use-case fit
Choose UM6K33NTN when…
- Implementing low-current switching or level shifting in a 50 V or below system requiring dual N-channel MOSFETs.
- Designing compact, low-power load switches or signal multiplexers with logic-level gate drive (1.2 V).
- Your application demands operation at elevated junction temperatures up to 150°C.
- Minimizing gate drive power and switching losses is critical due to low input capacitance.
- You require a small footprint MOSFET array in a UMT6 package for space-constrained designs.
Choose RAJ240057A20DNP#HC1 when…
- Building a multi-cell (2 to 4 cells) Li-ion or Li-polymer battery pack with integrated fuel gauging.
- System requires digital battery status reporting over I2C or UART interfaces.
- Overcurrent and short circuit fault detection and protection are necessary for battery safety.
- You need a turnkey, integrated battery management solution rather than discrete component assemblies.
- Ambient operating temperature is within -40°C to 85°C, typical for consumer electronics and portable devices.
Drop-in compatibility
These parts are not pin-compatible or footprint-compatible. The UM6K33NTN is a small 6-pin MOSFET array in a UMT6 package, whereas the RAJ240057A20DNP#HC1 is a 32-pin HVQFN IC (4x4 mm). Electrically and functionally, they serve entirely different roles—one is a discrete transistor array, the other a complex fuel gauge IC. Substituting one for the other would require a complete redesign of the PCB, firmware, and system architecture.
Alternatives to consider
- Si2312DS (Vishay): Logic-level N-channel MOSFET with lower RDS(on) for low-voltage switching, suitable for similar discrete switching roles as UM6K33NTN.
- BQ27441-G1 (Texas Instruments): Integrated fuel gauge IC with I2C interface, alternative to RAJ240057A20DNP#HC1 for Li-ion battery monitoring.
- FS8205A (ON Semiconductor): Dual N-channel MOSFET array with lower on-resistance, suitable for power path switching in battery applications.