UCC21520 - 4A/6A Isolated Dual-Channel Gate Driver | TI
MPN: UCC21520 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.45 | $3.45 |
| 10 | $3.1 | $31.00 |
| 100 | $2.48 | $248.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.79 | $1,790.00 |
Drop-in alternatives for UCC21520 — 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:
UCC21521
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →UCC21530
✅ Drop-In✓ In Stock
$2.41 / Unit
View Datasheet →UCC21540
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →UCC21550
✅ Drop-In✓ In Stock
$1.25 / Unit
View Datasheet →UCC5390
✅ Drop-In📋 Reference alternative (not in catalog)
UCC5350
✅ Drop-In📋 Reference alternative (not in catalog)
UCC21520 Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Peak Source Current | 4 A |
| Peak Sink Current | 6 A |
| Isolation Rating | 5.7 kVRMS |
| Isolation Technology | Capacitive |
| Propagation Delay | 19 ns |
| Pulse Width Distortion | 6 ns |
| Common Mode Transient Immunity (CMTI) | 100 V/ns |
| VDD Range | 6.5 V to 25 V |
| Input Thresholds | TTL and CMOS compatible |
| Disable Pin | Yes (DIS) |
| Maximum Switching Frequency | 5 MHz |
| Package | 16-SOIC (DW) |
| Operating Junction Temperature | -40°C to +150°C |
| RoHS Status | Compliant |
UCC21520 Pin Configuration
| Pin 1 | VCCI — Input-side supply voltage |
| Pin 2 | GNDI — Input-side ground |
| Pin 3 | INA — Input signal for channel A |
| Pin 4 | DIS — Disable pin (active high) |
| Pin 5 | INB — Input signal for channel B |
| Pin 6 | GNDI — Input-side ground |
| Pin 7 | VCCI — Input-side supply voltage |
| Pin 8 | NC — No connect |
| Pin 9 | VDDA — Output-side supply for channel A |
| Pin 10 | OUTA — Gate drive output for channel A |
| Pin 11 | GNDA — Output-side ground for channel A |
| Pin 12 | NC — No connect |
| Pin 13 | GNDB — Output-side ground for channel B |
| Pin 14 | OUTB — Gate drive output for channel B |
| Pin 15 | VDDB — Output-side supply for channel B |
| Pin 16 | NC — No connect |
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
UCC21520 is suitable for 6 applications: Isolated DC-DC Converters, Motor Drives, Solar Inverters, Electric Vehicle Charging Systems, Server and Telecom Power Supplies, UPS and Inverters.
Isolated DC-DC Converters
The UCC21520 drives the primary-side switches in isolated DC-DC converters, providing 4-A source and 6-A sink current to rapidly charge and discharge gate capacitances. Its 19-ns propagation delay enables high-frequency operation up to 5 MHz, improving power density. The 5.7-kVRMS isolation ensures safe signal transfer across the isolation barrier, while the 100-V/ns CMTI prevents false triggering during fast voltage transients. This makes it ideal for server and telecom power supplies where efficiency and reliability are critical.
Recommended
Motor Drives
In motor drives, the UCC21520 provides robust gate drive for IGBTs and MOSFETs in half-bridge and full-bridge topologies. Its 4-A source and 6-A sink peak current ensure fast switching, reducing switching losses and improving efficiency. The high CMTI of 100 V/ns ensures reliable operation in noisy industrial environments with high dv/dt transients. The wide VDD range of 6.5V to 25V accommodates various gate drive voltages, making it versatile for different motor types. The 16-SOIC package is compact, saving PCB space in space-constrained drives.
Recommended
Solar Inverters
The UCC21520 is ideal for solar inverters, where it drives SiC MOSFETs and IGBTs in the power stage. Its high peak current and fast propagation delay enable efficient switching at high frequencies, maximizing inverter efficiency. The 5.7-kVRMS isolation provides safety isolation between the DC and AC sides, meeting stringent safety standards. The 100-V/ns CMTI ensures reliable operation in the presence of fast voltage transients common in solar applications. The wide VDD range supports various gate drive voltages, simplifying design.
Recommended
Electric Vehicle Charging Systems
In EV charging systems, the UCC21520 drives the power switches in AC-DC and DC-DC converters. Its 4-A source and 6-A sink current provide fast switching, reducing losses and improving charging efficiency. The reinforced isolation of 5.7-kVRMS ensures safe operation in high-voltage environments, meeting automotive safety requirements. The wide operating temperature range of -40°C to +150°C makes it suitable for harsh automotive conditions. The 19-ns propagation delay enables precise control, essential for high-power charging.
Recommended
Server and Telecom Power Supplies
The UCC21520 is used in server and telecom power supplies to drive the primary-side switches in isolated converters. Its high peak current and fast propagation delay enable high-frequency operation, reducing transformer size and improving power density. The 5.7-kVRMS isolation provides reliable isolation for safety and noise immunity. The 100-V/ns CMTI ensures stable operation in noisy environments. The compact 16-SOIC package is ideal for space-constrained power supplies.
Recommended
UPS and Inverters
The UCC21520 is well-suited for UPS systems and inverters, where it drives IGBTs and MOSFETs in the power stage. Its 4-A source and 6-A sink current ensure fast switching, reducing losses and improving efficiency. The high CMTI of 100 V/ns ensures reliable operation in the presence of fast voltage transients. The wide VDD range of 6.5V to 25V provides flexibility in gate drive voltage design. The reinforced isolation of 5.7-kVRMS ensures safety in high-voltage applications.
Recommended
Recommended Products Summary
Engineering reference data for UCC21520 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | UCC21521 | UCC21530 | UCC21540 | UCC21550 |
|---|---|---|---|---|---|
| Package | 16-SOIC (DW) | 16-SOIC (DW) | 16-SOIC (DW) | 16-SOIC (DW) | 16-SOIC (DW) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Peak Source Current | 4 A | 4 A | 4 A | 4 A | 4 A |
| Peak Sink Current | 6 A | 6 A | 6 A | 6 A | 6 A |
| Isolation Rating | 5.7 kVRMS | 5.7 kVRMS | 5.7 kVRMS | 5.7 kVRMS | 5.7 kVRMS |
| Propagation Delay | 19 ns | 19 ns | 19 ns | 19 ns | 19 ns |
| VDD Range | 6.5V to 25V | 6.5V to 25V | 6.5V to 25V | 4.5V to 5.5V | 6.5V to 25V |
| Enable/Disable Pin | Disable (DIS) | Enable (EN) | Disable (DIS) | Disable (DIS) | Disable (DIS) |
Key Differentiators
- High CMTI of 100 V/ns (vs UCC21540)
- Wide VDD range up to 25V (vs UCC21540)
- Dual-channel with disable pin (vs UCC21521)
Design Notes
Place 0.1uF and 1uF decoupling capacitors as close as possible to the VCCI and VDDA/VDDB pins. Use low-ESR ceramic capacitors to ensure stable operation and minimize voltage spikes during switching. The ground pins should be connected to a solid ground plane to reduce parasitic inductance.
Minimize the gate drive loop area by placing the power switch and gate driver close together. Use wide, short traces for the OUTA and OUTB pins to reduce parasitic inductance and ringing. A Kelvin connection to the source/emitter of the power switch can further improve switching performance.
Ensure the DIS pin is properly pulled low or high to avoid unintended shutdown. When using the DIS pin for fault protection, add a pull-down resistor to keep the driver enabled by default. Also, verify that the input signals (INA, INB) are within the recommended input voltage range to prevent damage.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified for automotive; use UCC21520-Q1 for automotive.
