UM6K33NTN vs SQ1922EEH-T1_GE3 MOSFET Arrays: A Detailed Comparison
Quick verdict
For low-voltage, low-current signal switching or level shifting where minimal gate drive and ultra-compact packaging are priorities, the UM6K33NTN is the better fit due to its logic-level drive and low input capacitance. Conversely, for applications requiring higher current capacity, better thermal handling, and lower R_DS(on) at moderate voltages (up to 20 V), the SQ1922EEH-T1_GE3 is the superior choice, offering an order of magnitude higher current rating and significantly lower conduction losses.
Spec comparison table
| Spec | UM6K33NTN | SQ1922EEH-T1_GE3 | Notes |
|---|---|---|---|
| Configuration | 2 N-Channel (Dual) | 2 N-Channel (Dual) | Equivalent |
| Continuous Drain Current @ 25°C | 200 mA | 840 mA (Tc) | SQ1922 supports ~4x higher continuous current, better for higher load applications |
| Drain Current (min / typ) | N/A | 1.2 A (min) / 1 A (typ) | SQ1922 can handle significantly higher pulsed currents |
| Drain-Source Voltage Max | 50 V | 20 V | UM6K33 offers higher voltage margin |
| Power Dissipation Max | 120 mW | 1.5 W | SQ1922 can dissipate ~12.5× more power, better for thermally demanding circuits |
| R_DS(on) Max @ 200 mA, 4.5 V | 2.2 Ω | 0.35 Ω (typ) @ 25°C, 0.6 Ω @175°C | SQ1922 has substantially lower R_DS(on), reducing conduction losses |
| Gate Threshold Voltage (V_GS_th) Max | 1 V @ 1 mA | 1.5 V @ 250 µA | UM6K33 has lower threshold, better for low-voltage gate drive |
| Gate Drive Voltage | Logic Level Gate, 1.2 V drive | Not specified | UM6K33 guaranteed logic-level operation; SQ1922 likely needs higher gate voltage |
| Input Capacitance (C_iss) Max @ 10 V | 25 pF | 50 pF (typ) | UM6K33 has lower input capacitance, reducing gate charge and switching losses |
| Gate Charge (Q_g) Max @ 4.5 V | Not specified | 1.2 nC | SQ1922 gate charge known, moderate value; UM6K33 unknown |
| Power Package / Mounting | Surface Mount, UMT6 (6-TSSOP, SC-88, SOT-363) | Surface Mount, SC-70-6 | Different package types; SQ1922 smaller footprint (SC-70-6) |
| Operating Temperature Range (TJ) | Up to 150°C | -55°C to 175°C (TJ) | SQ1922 supports wider temperature range, suitable for automotive-grade applications |
| Gate Resistance (R_g) | Not specified | 4.5 Ω - 13.7 Ω | SQ1922 has moderate gate resistance, impacting switching speed and gate drive current |
| Forward Diode Voltage (typical) | Not specified | 1.2 V @ 0.5 A | SQ1922 includes body diode specs; useful for synchronous rectification considerations |
| Pulsed Current | Not specified | 3 A (min) | SQ1922 supports higher transient currents |
| Reverse Transfer Capacitance (C_rss) (typ) | Not specified | 10 pF | SQ1922 low C_rss aids in switching performance |
| Qualification | Not specified | AEC-Q101 Automotive Grade | SQ1922 is automotive qualified; UM6K33 not specified |
Design trade-offs
The UM6K33NTN is designed for logic-level drive with a low gate threshold voltage (1 V max at 1 mA), making it suitable for direct interfacing with low-voltage digital logic or microcontroller GPIOs. Its low input capacitance (25 pF) further reduces gate charge requirements, enabling lower switching losses and simpler gate drive circuits. However, this comes with a tradeoff in conduction losses: the R_DS(on) is relatively high at 2.2 Ω for 200 mA current, limiting its use to low-current switching or signal-level applications.
In contrast, the SQ1922EEH-T1_GE3 targets higher current and power levels with a continuous drain current rating of 840 mA (at case temperature) and pulsed current up to 3 A. Its R_DS(on) is significantly lower (0.35 Ω typical at 25°C), resulting in much lower conduction losses in switching or linear applications. The tradeoff is a higher gate threshold voltage (up to 1.5 V) and roughly double the input capacitance (50 pF), which demands a more robust gate drive and potentially higher switching losses, especially at high frequencies.
Thermally, the SQ1922 can dissipate up to 1.5 W compared to only 120 mW for the UM6K33, reflecting its suitability for higher power applications and more aggressive switching. Its operating junction temperature range from -55°C to 175°C and AEC-Q101 qualification make it a strong candidate for automotive or industrial environments requiring robustness and extended temperature operation.
The physical packages differ as well: SQ1922 comes in a smaller SC-70-6 package, which can save PCB area but may pose challenges in thermal dissipation compared to the UM6K33’s UMT6 (6-TSSOP / SC-88 / SOT-363) footprint that offers better thermal conduction paths. When laying out a board, UM6K33’s lower gate charge and logic-level drive simplify gate drive circuitry and reduce EMI concerns, while SQ1922 demands careful gate drive design and thermal management but rewards with higher current capability and efficiency.
Cost-wise, the UM6K33 is likely simpler and cheaper in volume production due to its lower specs and common footprint. The SQ1922, with automotive qualification and higher specs, will be priced higher but justifies this in applications requiring ruggedness and higher power handling.
Use-case fit
Choose UM6K33NTN when…
- You need a dual N-channel MOSFET array for low-current (≤200 mA) switching or level shifting directly driven by 1.2 V logic.
- Minimizing gate drive complexity and power consumption is critical, such as in battery-powered sensor interfaces.
- The switching frequency is low, and conduction losses can be tolerated due to low current.
- Operating voltage may be up to 50 V, requiring a higher voltage margin than typical low-voltage MOSFET arrays.
- PCB space is less constrained and thermal dissipation requirements are minimal (≤120 mW dissipation).
Choose SQ1922EEH-T1_GE3 when…
- Current requirements exceed 500 mA continuously, or transient pulses up to 3 A are expected.
- The application involves 20 V or lower voltage rails where low R_DS(on) is critical to reduce conduction losses.
- Thermal management is a concern, requiring a device rated for 1.5 W dissipation and junction temperatures up to 175°C.
- Automotive or industrial-grade qualification (AEC-Q101) is required for reliability and extended temperature range.
- The gate drive can provide at least 4.5 V and handle moderate gate charge (1.2 nC), accepting slightly higher gate drive complexity for efficiency gains.
Drop-in compatibility
Pin and footprint compatibility between UM6K33NTN and SQ1922EEH-T1_GE3 is unlikely. The UM6K33 is supplied in a UMT6 package (6-TSSOP / SC-88 / SOT-363), while the SQ1922 is in an SC-70-6 package, which is physically smaller. Neither datasheet indicates direct pin-for-pin or footprint interchangeability.
Substituting one for the other would require PCB redesign due to different package dimensions, pad layouts, and possibly pin assignments. Additionally, the different electrical characteristics (input capacitance, gate drive voltage, and current ratings) mean that gate drive circuitry and thermal design would need adjustment.
Alternatives to consider
- Si2302DS (Vishay): A dual N-channel MOSFET array with low R_DS(on) and logic-level gate drive, suitable for low-voltage, low-power applications.
- BSS138 (ON Semiconductor): Single N-channel logic-level MOSFET with low gate charge, widely used for level shifting and small load switching.
- NTR4502N (ON Semiconductor): Similar dual MOSFET array with higher voltage rating and moderate current handling, providing a middle ground between UM6K33 and SQ1922.
This comparison should help engineers select the appropriate dual N-channel MOSFET array based on current, voltage, thermal, and gate drive requirements specific to their application.