STMicroelectronics

STGAP2SA - 4A Galvanic Isolated Single Gate Driver | STMicroelectronics

Name: STGAP2SA
Brand: STMicroelectronics
Price: 2.85 USD
Availability: InStock

MPN: STGAP2SA ✓ Active

In Stock (99,999) Ships in 1-3 business days

4 kV (galvanic) Vdss 4 A (sink/source) Id SO-8 (narrow body) Package

$2.85 USD / Unit

MOQ: 1 |

Volume Pricing

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

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

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

📦 SO-8

Lower output current (2A vs 4A), same pinout

📋 Reference alternative (not in catalog)

STGAP2SAS

✅ Drop-In

📦 SO-8

Automotive grade variant, same pinout

📋 Reference alternative (not in catalog)

SI8261BCC-IS

✅ Drop-In

📦 SO-8

Cross-brand, similar isolation and current, pin-compatible

📋 Reference alternative (not in catalog)

UCC21520DW

✅ Drop-In

📦 SO-8

Cross-brand, dual-channel driver, pin-compatible? Verify

📋 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

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

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

STGAP2S (Lower current alternative) STGAP2SAS (Automotive grade variant)

⚡

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

STGAP2S (Lower current alternative) SI8261BCC-IS (Cross-brand alternative)

💡

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

STGAP2S (Lower current alternative) UCC21520DW (Cross-brand alternative)

🚗

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

STGAP2SAS (Automotive grade variant) SI8261BCC-IS (Cross-brand alternative)

🔧

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

STGAP2S (Lower current alternative) UCC21520DW (Cross-brand alternative)

🔥

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

STGAP2S (Lower current alternative) SI8261BCC-IS (Cross-brand alternative)

Recommended Products Summary

STGAP2S Lower current alternative Used in: Motor Drives, Industrial Power Supplies, Solar Inverters, Welding Equipment, Induction Heating STGAP2SAS Automotive grade variant Used in: Motor Drives, EV Charging Systems SI8261BCC-IS Cross-brand alternative Used in: Industrial Power Supplies, EV Charging Systems, Induction Heating UCC21520DW Cross-brand alternative Used in: Solar Inverters, Welding Equipment

What is the output current of STGAP2SA?

The STGAP2SA provides a 4A peak output current (sink and source). According to the STMicroelectronics datasheet, this high current capability enables fast switching of large gate charge power devices such as SiC MOSFETs and IGBTs.

What is the isolation voltage of STGAP2SA?

The STGAP2SA has a galvanic isolation voltage of 4 kV. This isolation rating is specified in the ST datasheet and ensures safe operation in high-voltage applications, protecting the low-voltage control side from transients.

What is the propagation delay of STGAP2SA?

The STGAP2SA has a propagation delay of 75 ns. This fast propagation delay is critical for high-frequency switching applications, minimizing signal delay and improving overall system efficiency.

What is the supply voltage range of STGAP2SA?

The STGAP2SA operates with a supply voltage range of 3V to 18V on both the input and output sides. This wide range allows flexible integration with various control logic levels and power stage voltages.

Does STGAP2SA have a Miller clamp?

Yes, the STGAP2SA includes a Miller clamp feature. This clamp prevents false turn-on of the power switch during high dv/dt events, enhancing system reliability in bridge configurations.

What is the common mode transient immunity (CMTI) of STGAP2SA?

The STGAP2SA has a common mode transient immunity (CMTI) of 100 V/ns. This high CMTI ensures reliable operation in noisy environments, preventing erroneous switching due to fast voltage transients across the isolation barrier.

What package is STGAP2SA available in?

The STGAP2SA is available in a narrow-body SO-8 package. This compact surface-mount package is suitable for space-constrained PCB designs and offers good thermal performance for moderate power dissipation.

What is the operating temperature range of STGAP2SA?

The STGAP2SA operates over a temperature range of -40°C to +125°C. This wide range makes it suitable for industrial and automotive environments where extreme temperatures are encountered.

Is STGAP2SA RoHS compliant?

Yes, the STGAP2SA is RoHS compliant. According to the STMicroelectronics product page, the device meets the Restriction of Hazardous Substances directive, ensuring environmental compliance.

Is STGAP2SA AEC-Q100 qualified?

No, the STGAP2SA is not AEC-Q100 qualified. It is a standard-grade device intended for industrial and consumer applications. For automotive-grade requirements, consider the STGAP2SAS or other AEC-Q100 qualified variants.

Where can I buy STGAP2SA online?

The STGAP2SA is available from major distributors such as DigiKey and Mouser. As of 2026-08-09, the price for a single unit is approximately $2.85 USD. Check current stock and pricing on their websites.

What is the price of STGAP2SA?

As of 2026-08-09, the STGAP2SA is priced at approximately $2.85 USD for a single unit, with volume pricing decreasing to around $1.85 USD at 1000 units. Prices may vary by distributor and quantity.

What is the lead time for STGAP2SA?

The typical lead time for STGAP2SA is 8-12 weeks from STMicroelectronics, depending on order quantity and distributor stock. For urgent requirements, check availability at DigiKey or Mouser for immediate shipment.

STGAP2SA vs STGAP2S - which is better for motor drives?

The STGAP2SA and STGAP2S are both isolated gate drivers from STMicroelectronics, but the STGAP2SA offers a higher output current of 4A compared to the STGAP2S's 2A. For motor drives requiring high gate charge switches, the STGAP2SA is better suited due to its higher current capability.

What is the difference between STGAP2SA and STGAP2S?

The main difference is the output current: STGAP2SA provides 4A peak, while STGAP2S provides 2A. Both share the same SO-8 package and isolation rating, but the STGAP2SA is designed for higher-power applications.

When should I choose STGAP2SA over STGAP2S?

Choose the STGAP2SA when you need to drive power switches with higher gate charge, such as large SiC MOSFETs or IGBTs, requiring more than 2A peak current. The STGAP2S is sufficient for smaller devices and lower power applications.

What is the best drop-in replacement for STGAP2SA?

The best drop-in replacement for STGAP2SA is the STGAP2S (same SO-8 package, pin-compatible) if you can accept a lower output current of 2A. For a cross-brand alternative, the Silicon Labs SI8261BCC-IS is pin-compatible and offers similar isolation, but verify parameters.

Can STGAP2S replace STGAP2SA?

Yes, the STGAP2S can replace the STGAP2SA in most applications, as it is pin-compatible and shares the same SO-8 package. However, the STGAP2S has a lower output current (2A vs 4A), so ensure it meets your gate drive requirements.

Where can I download the STGAP2SA datasheet PDF?

The STGAP2SA datasheet PDF can be downloaded from the STMicroelectronics website at https://www.st.com/resource/en/datasheet/stgap2sa.pdf. It contains full specifications, pinout, and application information.

Where can I find the STGAP2SA pinout?

The STGAP2SA pinout is detailed in the datasheet available at https://www.st.com/resource/en/datasheet/stgap2sa.pdf. The SO-8 package has 8 pins, including input, output, and power supply pins.

Hey Google, what can replace STGAP2SA?

The STGAP2SA can be replaced by the STGAP2S (same brand, same package, lower current) or the Silicon Labs SI8261BCC-IS (cross-brand, pin-compatible). Both are drop-in replacements in the SO-8 package, but verify output current and isolation ratings.

Is STGAP2SA the same as STGAP2S?

No, the STGAP2SA and STGAP2S are not identical. The STGAP2SA has a higher output current (4A) compared to the STGAP2S (2A). They share the same package and pinout, but the STGAP2SA is designed for higher-power applications.

What are the key specifications of STGAP2SA that engineers should know?

The key specifications of STGAP2SA include a 4A peak output current, 4 kV galvanic isolation, 75 ns propagation delay, 100 V/ns CMTI, and a supply voltage range of 3V to 18V. These parameters make it suitable for driving SiC MOSFETs and GaN HEMTs in high-frequency power converters.

What is the best Silicon Labs equivalent for STGAP2SA?

The best Silicon Labs equivalent for STGAP2SA is the SI8261BCC-IS, which is a pin-compatible isolated gate driver in the SO-8 package. It offers similar isolation and output current, but verify exact specifications before replacement.

Engineering reference data for STGAP2SA — comparison, design guidance, and compliance information.

Selection Guide

Choose the STGAP2SA when you need a high-current (4A) isolated gate driver for industrial applications such as motor drives, power supplies, and solar inverters. If you require automotive qualification, select the STGAP2SAS, which is pin-compatible and AEC-Q100 qualified. For lower-power applications where 2A is sufficient, the STGAP2S is a cost-effective alternative. If you prefer a cross-brand option, the Silicon Labs SI8261BCC-IS offers similar performance but lacks the Miller clamp and has lower CMTI. All alternatives share the SO-8 package, enabling PCB layout reuse.

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.