UM6K33NTN vs SQ1922AEEH-T1_GE3: Component Comparison for Hardware Engineers
Quick verdict
For low-voltage, low-current signal switching and level shifting where minimal gate drive voltage and compact package are priorities, the UM6K33NTN is the better choice due to its 50V rating, logic-level gate drive (1.2V), and low input capacitance. For higher current load switching up to 850mA, especially in automotive or industrial environments requiring AEC-Q101 qualification and enhanced thermal dissipation, the SQ1922AEEH-T1_GE3 outperforms with a 20V rating but significantly lower R_DS(on) and higher power handling.
Spec comparison table
| Spec | UM6K33NTN | SQ1922AEEH-T1_GE3 | Notes |
|---|---|---|---|
| Configuration | 2 N-Channel (Dual) | 2 N-Channel (Dual) | Equivalent |
| Continuous Drain Current (I_D @ 25°C) | 200mA | 850mA (Tc) | SQ1922AEEH-T1_GE3 supports >4x higher continuous current |
| Drain-Source Voltage (V_DS max) | 50V | 20V | UM6K33NTN supports higher voltage applications |
| Power Dissipation Max (P_D max) | 120mW | 1.5W (Tc) | SQ1922AEEH-T1_GE3 can dissipate >10x more power |
| R_DS(on) max @ I_D, V_GS | 2.2Ω @ 200mA, 4.5V | 0.530Ω @ 400mA, 4.5V | SQ1922AEEH-T1_GE3 has ~4x lower R_DS(on) at similar gate drive |
| Gate Threshold Voltage (V_GS(th) max) | 1.0V @ 1mA | 2.5V @ 250µA | UM6K33NTN has significantly lower V_GS(th), better for low-voltage logic drive |
| Gate Charge, Q_g max @ V_GS | Not specified | 1.2nC @ 4.5V | SQ1922AEEH-T1_GE3’s gate charge is low, but UM6K33NTN data missing—likely similar or lower |
| Input Capacitance, C_iss max @ V_DS | 25pF @ 10V | 60pF @ 10V | UM6K33NTN has less than half input capacitance, easier to drive at high frequency |
| Operating Temperature Range (T_J) | Up to 150°C | -55°C to 175°C | SQ1922AEEH-T1_GE3 has wider temperature range, including automotive grade |
| Package Case | UMT6 (6-TSSOP, SC-88, SOT-363) | SC-70-6 | SQ1922AEEH-T1_GE3 is smaller SC-70 package, better for compact layouts |
| Power Dissipation Typical | 120mW | 0.5W typical, up to 1.5W max (Tc) | SQ1922AEEH-T1_GE3 supports much higher power, better for load switching |
| Pulsed Drain Current Max | Not specified | 3.3A | SQ1922AEEH-T1_GE3 supports significantly higher pulsed current |
| Gate Resistance Typical | Not specified | 8.5Ω | SQ1922AEEH-T1_GE3’s gate resistance is moderate, impacts switching speed |
| Junction-to-Ambient Thermal Resistance Typ | Not specified | 460°C/W | SQ1922AEEH-T1_GE3’s thermal resistance is high, requires careful thermal design |
| Gate-to-Source Voltage Max | Not specified | 4.5V | SQ1922AEEH-T1_GE3 limited to 4.5V gate drive, design must respect this |
| Body Diode Forward Voltage Typ | Not specified | 1.2V | SQ1922AEEH-T1_GE3 body diode forward voltage known, useful for diode conduction design |
| Qualification | Not specified | AEC-Q101 Automotive | SQ1922AEEH-T1_GE3 is qualified for automotive-grade applications |
Design trade-offs
The UM6K33NTN’s standout feature is its higher voltage rating (50V) combined with a very low gate threshold voltage (1V max). This allows it to be driven directly from low-voltage logic (including 1.8–3.3V rails) without the need for a dedicated gate driver stage. Its input capacitance of 25pF is quite low, minimizing gate charge and easing switching losses in low-current, low-frequency signal switching or level shifting. However, its continuous drain current rating is limited to 200mA with a high R_DS(on) of 2.2Ω at 4.5V gate drive, making it unsuitable for moderate or high current loads.
In contrast, the SQ1922AEEH-T1_GE3 is optimized for higher current loads up to 850mA continuous (at case temperature) with a significantly lower R_DS(on) of 0.53Ω at 4.5V gate drive. This reduces conduction losses substantially, improving efficiency in load switching scenarios. The trade-off is a lower maximum drain-source voltage (20V), restricting its use where higher voltage tolerance is needed. Its gate threshold voltage is higher (up to 2.5V), so it cannot be driven directly from low-voltage logic without a gate driver stage or level shifter. The input capacitance is more than double (60pF), which slightly increases switching losses and gate drive demand at high frequency switching.
Thermal considerations clearly favor the SQ1922AEEH-T1_GE3 for power dissipation up to 1.5W at the case, compared to the UM6K33NTN’s 120mW rating. This means SQ1922AEEH-T1_GE3 can handle higher power loads but requires more careful PCB thermal management, especially given its relatively high junction-to-ambient thermal resistance. The UM6K33NTN’s lower power rating limits its use to low dissipation tasks or those with good heat sinking.
The packaging difference is relevant for layout and assembly: the UM6K33NTN uses a 6-pin TSSOP/SC-88 style package, which is larger than the SQ1922AEEH-T1’s smaller SC-70-6 package. The smaller SQ1922AEEH-T1_GE3 saves board space but may have higher thermal resistance due to the smaller pad area, impacting heat dissipation.
From a cost perspective, the UM6K33NTN is likely less expensive given its simpler specs and larger package, but this depends on volume and sourcing. The SQ1922AEEH-T1_GE3’s automotive qualification (AEC-Q101) can add cost but is a necessity in automotive or harsh environments.
Use-case fit
Choose UM6K33NTN when…
- You need a dual N-channel MOSFET array for switching or level shifting at voltages up to 50V but currents under 200mA.
- The design requires direct drive from low-voltage logic (1.2V–3.3V) without an external gate driver.
- Input capacitance and gate charge must be minimized to reduce switching losses in low-frequency control applications.
- Package size is less critical than voltage rating, or you prefer TSSOP/SC-88 packages for easier hand soldering or thermal conduction.
- The application involves signal-level switching with power dissipation under 120mW and moderate ambient temperature (up to 150°C junction).
Choose SQ1922AEEH-T1_GE3 when…
- You need to switch loads up to 850mA continuous current at voltages up to 20V.
- Automotive or industrial-grade qualification (AEC-Q101) is required for reliability.
- Low R_DS(on) is critical to reduce conduction losses and improve efficiency.
- The design can provide a 4.5V dedicated gate drive or level-shifted gate drive signals.
- Board space is at a premium, and a compact SC-70-6 package is preferred despite potential thermal constraints.
- The application involves moderate power dissipation (up to 1.5W) with proper thermal management.
Drop-in compatibility
These two parts are not drop-in compatible. Despite both being dual N-channel MOSFET arrays, their package types differ: the UM6K33NTN is in a UMT6 (6-TSSOP/SC-88/SOT-363) package, while the SQ1922AEEH-T1_GE3 uses a smaller SC-70-6 package with different pinouts and footprint dimensions. Additionally, their maximum drain-source voltages and gate drive requirements differ, so circuit-level changes would be necessary to substitute one for the other safely. Without detailed pin assignment comparison (not provided), pin compatibility cannot be confirmed.
Alternatives to consider
- BSS138 (ON Semiconductor): Single N-channel MOSFET with low gate threshold and 50V rating; useful for low-current switching and level shifting.
- **Si230