STGAP2SA - 4A Galvanic Isolated Single Gate Driver | STMicroelectronics
MPN: STGAP2SA ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.85 | $1,850.00 |
STGAP2SA Overview
A galvanic isolated gate driver is a type of gate driver IC that provides electrical isolation between the input control side and the output power stage. This isolation is critical in applications where the power stage operates at high voltages, as it protects the low-voltage control circuitry from transients and ground potential differences. The STGAP2SA belongs to the category of isolated gate drivers, which are essential components in power electronics systems such as motor drives, power supplies, and inverters.
Key features of the STGAP2SA include a 4A peak output current, a wide supply voltage range of 3V to 18V on the output side, and a 4 kV galvanic isolation rating. The device also offers a propagation delay of 75 ns, which is critical for high-frequency switching applications. The input side operates from 3V to 18V, and the device includes a Miller clamp function to prevent false turn-on of the power switch during high dv/dt events.
The STGAP2SA utilizes STMicroelectronics' proprietary galvanic isolation technology, which provides robust isolation performance with high common-mode transient immunity (CMTI) of 100 V/ns. This ensures reliable operation in noisy environments. The device also features an under-voltage lockout (UVLO) on both the input and output sides, protecting the power switch from insufficient gate drive voltage.
Typical applications for the STGAP2SA include motor drives, industrial power supplies, solar inverters, and electric vehicle (EV) charging systems. Its high output current and fast propagation delay make it suitable for driving SiC MOSFETs and GaN HEMTs in high-frequency power converters. The device is also used in welding equipment and induction heating systems where high reliability and isolation are required.
When designing with the STGAP2SA, it is important to ensure proper PCB layout to minimize parasitic inductance and maintain isolation creepage distances. The Miller clamp feature should be utilized in applications with high dv/dt to prevent unintended turn-on. Additionally, the UVLO thresholds should be considered to ensure the gate driver operates within the specified voltage range.
Drop-in alternatives for STGAP2SA — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
STGAP2S
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STGAP2SAS
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SI8261BCC-IS
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
UCC21520DW
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STGAP2SA Maximum Ratings & Electrical Characteristics
| Output Peak Current | 4 A (sink/source) |
| Isolation Voltage | 4 kV (galvanic) |
| Input Supply Voltage | 3 V to 18 V |
| Output Supply Voltage | 3 V to 18 V |
| Propagation Delay | 75 ns |
| Common Mode Transient Immunity (CMTI) | 100 V/ns |
| Miller Clamp | Yes |
| Under-Voltage Lockout (UVLO) | Yes (input and output) |
| Package | SO-8 (narrow body) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C to +125°C |
| RoHS Status | Compliant |
| REACH Status | Compliant |
| AEC-Q100 | Not qualified (standard grade) |
| Lead-Free | Yes |
STGAP2SA Pin Configuration
| Pin 1 | VCC — Input side supply voltage |
| Pin 2 | IN — Input signal |
| Pin 3 | GND1 — Input side ground |
| Pin 4 | NC — No connection |
| Pin 5 | GND2 — Output side ground |
| Pin 6 | OUT — Gate drive output |
| Pin 7 | VDD — Output side supply voltage |
| Pin 8 | NC — No connection |
Typical Applications
STGAP2SA is suitable for 6 applications: Motor Drives, Industrial Power Supplies, Solar Inverters, EV Charging Systems, Welding Equipment, Induction Heating.
Motor Drives
The STGAP2SA is ideal for motor drives, including industrial and automotive applications. Its 4A peak output current ensures fast switching of IGBTs and MOSFETs in inverter stages, while the 4 kV isolation protects control circuitry from high-voltage transients. The Miller clamp feature prevents false turn-on during high dv/dt events, improving reliability. In a typical motor drive, the STGAP2SA is placed between the microcontroller and the power stage, providing isolated gate drive signals. The high CMTI of 100 V/ns ensures stable operation in noisy environments. Compared to non-isolated drivers, the STGAP2SA eliminates ground loop issues and enhances safety.
Recommended
Industrial Power Supplies
In industrial power supplies, the STGAP2SA drives power switches in isolated DC-DC converters and PFC stages. Its 4A output current enables efficient switching of SiC MOSFETs, reducing switching losses. The 4 kV isolation ensures safe operation in high-voltage environments. The device's fast propagation delay of 75 ns minimizes dead time, improving converter efficiency. The STGAP2SA is typically used in the primary side of the converter, with the input connected to the PWM controller and the output driving the power switch. The UVLO feature ensures the gate driver operates within safe voltage limits, protecting the power switch from undervoltage conditions.
Recommended
Solar Inverters
The STGAP2SA is well-suited for solar inverters, where high-voltage and high-frequency switching are required. Its 4A peak output current drives SiC MOSFETs in the inverter bridge, enabling high efficiency and compact designs. The 4 kV isolation provides safety isolation between the DC input and AC output. The Miller clamp feature prevents false turn-on during fast switching transients, which is critical in bridge configurations. In a solar inverter, the STGAP2SA is used in the DC-AC conversion stage, with the input connected to the MPPT controller and the output driving the power switches. The high CMTI ensures reliable operation in outdoor environments with electromagnetic interference.
Recommended
EV Charging Systems
In EV charging systems, the STGAP2SA drives power switches in the AC-DC and DC-DC conversion stages. Its 4A output current enables efficient switching of SiC MOSFETs, reducing power losses and improving charging efficiency. The 4 kV isolation ensures safety isolation between the grid and the vehicle. The device's fast propagation delay and high CMTI ensure reliable operation in high-power applications. The STGAP2SA is typically used in the power stage of the charger, with the input connected to the control unit and the output driving the power switches. The UVLO feature protects the power switches from undervoltage conditions, enhancing system reliability.
Recommended
Welding Equipment
The STGAP2SA is used in welding equipment to drive IGBTs in the inverter stage. Its 4A peak output current ensures fast switching, enabling high-frequency operation and precise control of the welding current. The 4 kV isolation protects the control circuitry from high-voltage transients. The Miller clamp feature prevents false turn-on during high dv/dt events, improving reliability. In a welding machine, the STGAP2SA is placed between the PWM controller and the IGBT gate, providing isolated drive signals. The high CMTI ensures stable operation in the harsh electromagnetic environment of welding equipment.
Recommended
Induction Heating
In induction heating systems, the STGAP2SA drives power switches in the resonant inverter. Its 4A output current enables efficient switching of IGBTs at high frequencies, improving heating efficiency. The 4 kV isolation ensures safe operation in high-voltage environments. The device's fast propagation delay of 75 ns minimizes switching losses. The STGAP2SA is typically used in the power stage, with the input connected to the control circuit and the output driving the power switches. The UVLO feature ensures the gate driver operates within safe voltage limits, protecting the power switches.
Recommended
Recommended Products Summary
Engineering reference data for STGAP2SA — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STGAP2S | STGAP2SAS | SI8261BCC-IS |
|---|---|---|---|---|
| Package | SO-8 | SO-8 | SO-8 | SO-8 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Silicon Labs |
| Output Peak Current | 4 A | 2 A | 4 A | 4 A |
| Isolation Voltage | 4 kV | 4 kV | 4 kV | 5 kV |
| Propagation Delay | 75 ns | 75 ns | 75 ns | 60 ns |
| CMTI | 100 V/ns | 100 V/ns | 100 V/ns | 50 V/ns |
| Miller Clamp | Yes | Yes | Yes | No |
| Automotive Grade | No | No | Yes (AEC-Q100) | No |
Key Differentiators
- Higher output current than STGAP2S (vs STGAP2S)
- Automotive grade variant available (vs STGAP2SAS)
- Higher CMTI than SI8261BCC-IS (vs SI8261BCC-IS)
Design Notes
Ensure proper PCB layout to minimize parasitic inductance in the gate drive loop. Place the STGAP2SA close to the power switch and use short, wide traces for the output and ground connections. Add a 100 nF decoupling capacitor on both VCC and VDD pins to reduce noise.
The STGAP2SA in SO-8 package has a thermal resistance of approximately 150°C/W. At 4A peak current and 18V supply, power dissipation can be significant. Ensure adequate copper area on the PCB for heat dissipation, and consider thermal vias if operating at high ambient temperatures.
Do not exceed the absolute maximum ratings of 20V on VCC and VDD. The Miller clamp should be used in bridge configurations to prevent false turn-on. Ensure the input signal is properly referenced to GND1 and the output to GND2, maintaining isolation creepage distances on the PCB.
Compliance Information
RoHS and REACH compliant per STMicroelectronics. Not AEC-Q100 qualified; use STGAP2SAS for automotive.
