SQ1922AEEH-T1_GE3 vs SQ1912AEEH-T1_GE3: Component Comparison
Quick verdict
For low-voltage, low-current switching applications requiring minimal gate drive complexity and very low on-resistance, the SQ1912AEEH-T1_GE3 is preferable due to its significantly lower RDS(on) and gate resistance, which translates to better efficiency and faster switching. However, for applications where thermal robustness and higher continuous drain current margin are priorities, or where a slightly higher gate threshold voltage is acceptable, the SQ1922AEEH-T1_GE3 offers better thermal performance and current handling.
Spec comparison table
| Spec | SQ1922AEEH-T1_GE3 | SQ1912AEEH-T1_GE3 | Notes |
|---|---|---|---|
| Configuration | 2 N-Channel (Dual) | 2 N-Channel (Dual) | Equivalent |
| Drain-source voltage max (V) | 20 | 20 | Equivalent |
| Continuous drain current (Tc) (A) | 0.85 (typ 0.53) | 0.80 (typ 0.80) | SQ1922AEEH has slightly higher max continuous current rating |
| Pulsed drain current max (A) | 3.3 | 3.0 | Marginal advantage to SQ1922AEEH |
| Drain-source on-resistance RDS(on) max @ 4.5V (Ω) | 0.530 | 0.510 | SQ1912AEEH has marginally lower RDS(on), better conduction losses |
| Drain-source on-resistance RDS(on) typ (Ω) | 0.490 | 0.200 | SQ1912AEEH significantly better typical RDS(on), lower conduction losses |
| Gate charge Qg max @ 4.5 V (nC) | 1.2 | 1.25 | Comparable gate charge |
| Gate resistance max (Ω) | 13.5 | 4500 | SQ1922AEEH has very low gate resistance (5–13.5 Ω) vs very high in SQ1912AEEH (1.5–4.5 kΩ) |
| Gate-source threshold voltage Vth max (V) | 2.5 | 1.5 | Lower threshold in SQ1912AEEH for easier turn-on |
| Gate-source threshold voltage Vth typ (V) | 2.0 | 0.6 | SQ1912AEEH turns on at lower gate voltage |
| Input capacitance Ciss max @ 10V (pF) | 60 | 27 | SQ1912AEEH lower input capacitance, easier to drive faster |
| Body diode forward voltage max (V) | Limited by Ra (max) | 0.05 | SQ1912AEEH body diode forward voltage is significantly lower |
| Body diode forward voltage typ (V) | 1.2 | 0.02 | SQ1912AEEH better diode conduction characteristics |
| Operating temperature range (°C) | -55 to 175 | -55 to 125 | SQ1922AEEH supports higher junction temperature |
| Power dissipation max (W) | 1.5 (Tc) | 1.5 | Equivalent |
| Package type | SC-70-6 | SC-70-6 | Equivalent |
| Junction-to-ambient thermal resistance typ (°C/W) | 460 | 220 | SQ1912AEEH has better thermal dissipation |
| Junction-to-foot thermal resistance max (°C/W) | 100 | ~100 | Equivalent |
| Turn-on delay time min (ns) | 10 | 66 | SQ1922AEEH faster turn-on delay |
| Fall time typ (ns) | 10 | 487 | SQ1922AEEH much faster switching times |
| Rise time typ (ns) | 15 | 15 | Equivalent |
| Gate-source leakage current typ (A) | ±10 mA | +1 µA | SQ1912AEEH has lower gate leakage |
| Qualification | AEC-Q101 | AEC-Q101 | Equivalent |
Design trade-offs
The most significant difference between these two MOSFET arrays lies in their gate drive characteristics and conduction losses. The SQ1912AEEH-T1_GE3 features a much lower RDS(on) (typical 0.2 Ω vs 0.49 Ω) and a drastically higher gate resistance (1.5 to 4.5 kΩ vs 5 to 13.5 Ω). This suggests the SQ1912AEEH is optimized for low conduction losses at the expense of requiring a higher gate drive resistance or slower switching speeds. The high gate resistance also implies this device is intended for applications where switching speed is less critical, or the gate drive is inherently limited (e.g., microcontroller GPIOs with limited drive strength).
Conversely, the SQ1922AEEH-T1_GE3, with its low gate resistance and faster switching times (fall time typ 10 ns vs 487 ns), suits higher-frequency switching applications where efficiency gains from faster transitions offset its higher RDS(on). However, it dissipates more power during conduction due to its higher on-resistance, which might limit its use in high-current or continuous conduction scenarios.
Thermally, the SQ1912AEEH has a lower junction-to-ambient thermal resistance (~220°C/W typical vs 460°C/W), indicating better heat dissipation capability. This could enable higher power dissipation in the same footprint or reduce thermal stress. However, the SQ1922AEEH supports a wider operating temperature range up to 175°C junction temperature, compared to 125°C for the SQ1912AEEH, which might be crucial in automotive or harsh environment designs.
Regarding body diode performance, the SQ1912AEEH has a significantly lower forward voltage drop (typical 20 mV vs 1.2 V), reducing losses during reverse conduction or inductive load switching scenarios. This can be a critical factor in applications with frequent diode conduction.
From a layout perspective, the package and pin count are identical (SC-70-6), but the thermal pad recommendations and junction-to-foot thermal resistances are similar, so PCB thermal layout considerations remain consistent.
Cost-wise, the higher gate resistance of the SQ1912AEEH might simplify gate drive circuitry, potentially offsetting the cost of the MOSFET itself in some designs, while the SQ1922AEEH’s faster switching and higher RDS(on) might require more careful gate drive design and thermal management.
Use-case fit
Choose SQ1922AEEH-T1_GE3 when…
- Designing high-frequency switching circuits where fast switching speeds (fall time ~10 ns) reduce switching losses despite higher conduction losses.
- Operating in high ambient temperatures or harsh environments requiring extended junction temperature range (up to 175°C).
- Applications needing a slightly higher continuous drain current (0.85 A vs 0.8 A) margin for reliability.
- Gate drive signals are strong and can support low gate resistance devices without risk of oscillation.
- Thermal management is implemented with copper planes or heat sinking to mitigate higher thermal resistance.
Choose SQ1912AEEH-T1_GE3 when…
- Low on-resistance (typical 0.2 Ω) is critical to minimize conduction losses at currents up to 0.8 A.
- Gate drive current is limited or must be minimized, as high gate resistance (1.5–4.5 kΩ) reduces the need for complex gate drive circuitry.
- Switching speed is less critical, or slower switching is acceptable to reduce EMI.
- Body diode conduction occurs frequently, benefiting from the very low forward voltage drop (20 mV typical).
- Better thermal dissipation is required within the same package size (junction-to-ambient resistance ~220°C/W typical).
Drop-in compatibility
Both devices share the same package (SC-70-6) and pin count (6-pin dual N-channel MOSFET array), and both are from Vishay Siliconix with automotive qualification (AEC-Q101), suggesting footprint and pin compatibility. However, the datasheets do not explicitly confirm pin-to-pin equivalence.
Substituting one for the other should be approached with caution due to the significant differences in gate resistance and threshold voltage, which can affect gate drive design and switching behavior. The SQ1912AEEH’s very high gate resistance and lower threshold voltage may require modifications to gate driver circuits or firmware timing. Conversely, the SQ1922AEEH’s lower gate resistance and higher switching speed may induce ringing or EMI if the layout and gate drive are not optimized accordingly.
In absence of explicit manufacturer confirmation, verify pinouts and gate drive compatibility before drop-in substitution.
Alternatives to consider
- BSS138 (ON Semiconductor): Single N-channel MOSFET with low RDS(on) in a small SOT-23 package, suitable for low-voltage, low-current switching with minimal gate charge.
- Si2302DS (Vishay): Low-voltage MOSFET with low gate charge and RDS(on), good for battery-operated and portable device switching.
- IRLML6344 (Infineon): Logic