UCC21521 - 4A/6A Isolated Dual-Channel Gate Driver | TI
MPN: UCC21521 ✓ 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 | $1.82 | $1,820.00 |
Drop-in alternatives for UCC21521 — 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:
UCC21520
✅ Drop-In✓ In Stock
$1.79 / 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 →UCC21551
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM4223ARWZ
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →ISO5852S
✅ Drop-In📋 Reference alternative (not in catalog)
UCC21521 Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Peak Source Current | 4 A |
| Peak Sink Current | 6 A |
| Isolation Rating | 5.7 kVrms |
| Propagation Delay (Typical) | 19 ns |
| Minimum Pulse Width | 10 ns |
| Delay Matching (Maximum) | 5 ns |
| Pulse Width Distortion (Maximum) | 6 ns |
| Common-Mode Transient Immunity | 100 V/ns (minimum) |
| Input Supply Voltage (VCCI) | 3 V to 18 V |
| Output Supply Voltage (VDDA/VDDB) | [DATA_NEEDED: output supply voltage range] |
| Operating Temperature Range | -40°C to +125°C |
| Package | 16-SOIC (DW) |
| Mounting Type | Surface Mount |
| Enable Pin | Yes |
| UVLO | 8-V UVLO (per chipdig) |
| RoHS Status | Compliant |
UCC21521 Pin Configuration
| Pin 1 | VCCI — Input supply voltage |
| Pin 2 | GNDI — Input ground |
| Pin 3 | INA — Input signal for channel A |
| Pin 4 | INB — Input signal for channel B |
| Pin 5 | EN — Enable pin (active high) |
| Pin 6 | NC — No connect |
| Pin 7 | NC — No connect |
| Pin 8 | GNDI — Input ground |
| Pin 9 | VDDA — Output supply voltage for channel A |
| Pin 10 | OUTA — Gate drive output for channel A |
| Pin 11 | GNDA — Output ground for channel A |
| Pin 12 | GNDB — Output ground for channel B |
| Pin 13 | OUTB — Gate drive output for channel B |
| Pin 14 | VDDB — Output supply voltage for channel B |
| Pin 15 | NC — No connect |
| 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
UCC21521 is suitable for 6 applications: Isolated DC-DC Converters, Motor Drives, Solar Inverters, Electric Vehicle Onboard Chargers, Industrial Power Supplies, Renewable Energy Systems.
Isolated DC-DC Converters
The UCC21521 is ideal for isolated DC-DC converters, providing high peak current (4A source, 6A sink) to drive power MOSFETs and IGBTs. Its 5.7-kVrms isolation ensures safety in high-voltage applications. The fast propagation delay (19ns) and high common-mode transient immunity (100V/ns) enable efficient switching at high frequencies, reducing losses and improving power density. The enable pin allows for controlled startup and fault protection, enhancing system reliability.
Recommended
Motor Drives
In motor drives, the UCC21521 drives the high-side and low-side switches of the inverter bridge. Its 4A/6A peak current ensures fast switching of IGBTs and MOSFETs, reducing switching losses. The 5.7-kVrms isolation protects the control circuitry from high-voltage transients. The programmable dead time helps prevent shoot-through, improving reliability. The wide operating temperature range (-40°C to +125°C) suits industrial environments.
Recommended
Solar Inverters
The UCC21521 is used in solar inverters to drive the power stage, converting DC from solar panels to AC. Its high isolation rating (5.7-kVrms) ensures safety in high-voltage systems. The fast propagation delay and high common-mode transient immunity enable reliable operation in noisy environments. The device's high peak current (4A/6A) drives SiC MOSFETs efficiently, improving inverter efficiency and power density.
Recommended
Electric Vehicle Onboard Chargers
In EV onboard chargers, the UCC21521 drives the power switches in the AC-DC and DC-DC stages. Its 5.7-kVrms isolation provides safety in high-voltage battery systems. The high peak current (4A/6A) and fast switching (up to 5MHz) enable efficient power conversion, reducing charging time. The enable pin allows for controlled startup and shutdown, enhancing system safety. The wide temperature range supports automotive environments.
Recommended
Industrial Power Supplies
The UCC21521 is suitable for industrial power supplies, providing isolated gate driving for high-voltage switches. Its 4A/6A peak current ensures fast switching, reducing losses. The 5.7-kVrms isolation protects control circuits from high-voltage transients. The device's high common-mode transient immunity (100V/ns) ensures reliable operation in noisy industrial environments. The enable pin allows for power sequencing and fault protection.
Recommended
Renewable Energy Systems
The UCC21521 is used in renewable energy systems such as wind and solar power converters. Its high isolation rating (5.7-kVrms) ensures safety in high-voltage applications. The fast propagation delay (19ns) and high peak current (4A/6A) enable efficient switching of IGBTs and SiC MOSFETs, improving system efficiency. The wide operating temperature range (-40°C to +125°C) suits outdoor installations.
Recommended
Recommended Products Summary
Engineering reference data for UCC21521 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | UCC21520 | UCC21530 | UCC21540 | UCC21550 | UCC21551 | ADuM4223 |
|---|---|---|---|---|---|---|---|
| Package | 16-SOIC (DW) | 16-SOIC (DW) | 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 | Texas Instruments | Analog Devices |
| Peak Source Current | 4 A | 4 A | 4 A | 4 A | 4 A | 4 A | 4 A |
| Peak Sink Current | 6 A | 6 A | 6 A | 6 A | 6 A | 6 A | 4 A |
| Isolation Rating | 5.7 kVrms | 5.7 kVrms | 5.7 kVrms | 5.7 kVrms | 5.7 kVrms | 5.7 kVrms | 5.7 kVrms |
| Propagation Delay (Typical) | 19 ns | 19 ns | 19 ns | 19 ns | 19 ns | 19 ns | [DATA_NEEDED] |
| Enable Pin | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| UVLO Threshold | 8 V | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- High peak current (4A source, 6A sink) (vs ADuM4223)
- Fast propagation delay (19ns typical) (vs ADuM4223)
- Reinforced isolation (5.7-kVrms) (vs ISO5852S)
Design Notes
Place decoupling capacitors (e.g., 0.1 µF and 10 µF) close to the VCCI and VDDA/VDDB pins to ensure stable supply voltages. Minimize parasitic inductance in the gate drive loop by keeping the gate driver and power switch close together. Use wide, short traces for high-current paths.
The UCC21521 can dissipate significant power at high switching frequencies. Ensure adequate copper area on the PCB for heat dissipation. The 16-SOIC package has a thermal resistance that should be considered; refer to the datasheet for thermal metrics. For high-power applications, consider adding thermal vias.
Avoid exceeding the absolute maximum ratings for VCCI and VDDA/VDDB. Ensure the enable pin is properly driven to avoid unintended shutdown. Pay attention to the UVLO thresholds to ensure proper startup. Also, verify the input logic levels are compatible with the controller.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified; for automotive, check specific variants.
