UCC21521 - 4A/6A Isolated Dual-Channel Gate Driver | TI
MPN: UCC21521 β 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 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
UCC21520
β Drop-Inβ In Stock
$1.82 / Unit
View Datasheet βUCC21521ADWR
β Drop-Inπ Reference alternative (not in catalog)
UCC21521DWR
β Drop-Inπ Reference alternative (not in catalog)
ADUM4223ARWZ
β Drop-Inβ In Stock
$3.1 / Unit
View Datasheet βADUM4222ARWZ
β Drop-Inβ In Stock
$3.1 / Unit
View Datasheet βUCC21521 Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Peak Source Current | 4 A |
| Peak Sink Current | 6 A |
| Isolation Voltage | 5.7 kVrms |
| Propagation Delay | 19 ns (typical) |
| Minimum Pulse Width | 10 ns |
| Delay Matching | 5 ns (maximum) |
| Pulse Width Distortion | 6 ns (maximum) |
| Common-Mode Transient Immunity | 100 V/ns (minimum) |
| Input Logic Compatibility | TTL and CMOS |
| Operating Temperature Range | -40Β°C to +125Β°C |
| Package | SOIC-16 (DW) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Enable Pin | Yes |
UCC21521 Pin Configuration
| Pin 1 | VCCI β Input supply voltage |
| Pin 2 | GNDI β Input ground |
| Pin 3 | INA β Input signal for channel A |
| Pin 4 | INB β Input signal for channel B |
| Pin 5 | ENA β Enable for channel A (active high) |
| Pin 6 | ENB β Enable for channel B (active high) |
| Pin 7 | NC β No connect |
| Pin 8 | NC β No connect |
| Pin 9 | VDDB β Output supply for channel B |
| Pin 10 | OUTB β Gate drive output for channel B |
| Pin 11 | GNDB β Output ground for channel B |
| Pin 12 | GNDB β Output ground for channel B |
| Pin 13 | GNDA β Output ground for channel A |
| Pin 14 | GNDA β Output ground for channel A |
| Pin 15 | OUTA β Gate drive output for channel A |
| Pin 16 | VDDA β Output supply for channel A |
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, Inductive Heating, Uninterruptible Power Supplies (UPS).
Isolated DC-DC Converters
The UCC21521 is ideal for isolated DC-DC converters, where its 4-A source and 6-A sink peak current enable fast switching of power MOSFETs, reducing switching losses. The 5.7-kV RMS reinforced isolation ensures safe operation across the isolation barrier, while the 19-ns propagation delay maintains precise PWM control. Its high common-mode transient immunity of 100 V/ns prevents false triggering in noisy environments, making it a reliable choice for high-density power modules.
Recommended
Motor Drives
In motor drive applications, the UCC21521 drives the gate of IGBTs and power MOSFETs in the inverter stage. Its 4-A source and 6-A sink currents provide fast turn-on and turn-off, minimizing switching losses and improving efficiency. The reinforced isolation of 5.7-kV RMS protects the low-voltage control circuitry from high-voltage transients, while the programmable dead time prevents shoot-through currents. The wide operating temperature range of -40Β°C to +125Β°C ensures reliable operation in industrial environments.
Recommended
Solar Inverters
The UCC21521 is well-suited for solar inverters, where it drives the power switches in the DC-AC conversion stage. Its high peak current and fast propagation delay enable efficient switching at high frequencies, reducing the size of passive components. The reinforced isolation ensures safety in high-voltage systems, and the high common-mode transient immunity prevents false triggering due to fast voltage transients. This makes the UCC21521 a reliable choice for maximizing energy harvest in photovoltaic systems.
Recommended
Electric Vehicle Onboard Chargers
In electric vehicle onboard chargers, the UCC21521 drives the power MOSFETs and SiC MOSFETs in the PFC and DC-DC stages. Its 4-A source and 6-A sink currents enable fast switching, reducing losses and improving efficiency. The 5.7-kV RMS reinforced isolation meets the stringent safety requirements of automotive applications, and the wide temperature range supports operation in harsh environments. The device's high common-mode transient immunity ensures reliable operation in the noisy automotive electrical system.
Recommended
Inductive Heating
The UCC21521 is used in inductive heating systems to drive the high-frequency power switches. Its 4-A source and 6-A sink peak currents provide fast switching, enabling high-frequency operation up to 5 MHz. The reinforced isolation protects the control circuitry from high-voltage transients, and the low propagation delay ensures precise timing. This makes the UCC21521 suitable for applications such as induction cooktops and industrial heating systems.
Recommended
Uninterruptible Power Supplies (UPS)
In UPS systems, the UCC21521 drives the IGBTs in the inverter stage, providing reliable power backup. Its high peak current and fast switching reduce losses and improve efficiency, while the reinforced isolation ensures safe operation. The device's wide operating temperature range and high common-mode transient immunity make it suitable for demanding UPS environments. The UCC21521 helps maintain clean and reliable power output during grid failures.
Recommended
Recommended Products Summary
Engineering reference data for UCC21521 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | UCC21520 | UCC21521ADWR | ADuM4223 |
|---|---|---|---|---|
| Package | SOIC-16 (DW) | SOIC-16 (DW) | SOIC-16 (DW) | SOIC-16 (DW) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Peak Source Current | 4 A | 4 A | 4 A | 4 A |
| Peak Sink Current | 6 A | 4 A | 6 A | 4 A |
| Isolation Voltage | 5.7 kVrms | 5.7 kVrms | 5.7 kVrms | 5 kVrms |
| Propagation Delay | 19 ns | 19 ns | 19 ns | 46 ns |
| Common-Mode Transient Immunity | 100 V/ns | 100 V/ns | 100 V/ns | 50 V/ns |
| Operating Temperature Range | -40Β°C to +125Β°C | -40Β°C to +125Β°C | -40Β°C to +125Β°C | -40Β°C to +125Β°C |
Key Differentiators
- Higher sink current (6 A) for faster turn-off (vs UCC21520)
- Reinforced isolation of 5.7 kVrms (vs ADuM4223)
- Faster propagation delay (19 ns) (vs ADuM4223)
Design Notes
Place 0.1 Β΅F and 10 Β΅F decoupling capacitors close to the VCCI, VDDA, and VDDB pins to ensure stable supply voltages. Use low-ESR ceramic capacitors and minimize trace length to reduce parasitic inductance. This is critical for maintaining the specified propagation delay and preventing false triggering.
Keep the gate drive loop (OUTA/OUTB to the power transistor gate and source) as short and wide as possible to minimize inductance. This reduces ringing and overshoot, which can cause EMI and damage the gate oxide. A recommended layout is to place the driver close to the power switches and use a ground plane for the return path.
The UCC21521 dissipates power primarily during switching transitions. At high frequencies, ensure adequate thermal management by providing copper pour on the PCB and possibly a thermal via array under the device. The SOIC-16 package has a thermal resistance of approximately 80Β°C/W, so keep the junction temperature below 150Β°C for reliable operation.
Compliance Information
RoHS compliant per TI product page. AEC-Q100 qualification not specified for standard version; UCC21521ADWR is automotive grade.
