UCC21540 - 4A/6A Reinforced Isolated Gate Driver | TI
MPN: UCC21540 ✓ 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 UCC21540 — 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:
UCC21540A
✅ Drop-In📋 Reference alternative (not in catalog)
UCC21541
✅ Drop-In📋 Reference alternative (not in catalog)
UCC21520
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →UCC21530
✅ Drop-In✓ In Stock
$2.25 / Unit
View Datasheet →ADUM4223ARWZ
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →UCC21540 Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Peak Source Current | 4 A |
| Peak Sink Current | 6 A |
| Isolation Type | Capacitive |
| Isolation Rating | 5700 Vrms |
| Channel-to-Channel Spacing | 3.3 mm (DWK package) |
| Output Side VDD Range | 6.5 V to 18 V |
| Primary Side UVLO | 8 V |
| Secondary Side UVLO | 6.5 V |
| Propagation Delay | [DATA_NEEDED: propagation delay] |
| Common-Mode Transient Immunity (CMTI) | [DATA_NEEDED: CMTI] |
| Deadtime Programming | Yes (DT pin) |
| Disable Function | Yes |
| Package | SOIC-14 (DWK) |
| Operating Temperature Range | -40°C to +125°C |
| RoHS Status | Compliant |
UCC21540 Pin Configuration
| Pin 1 | VCCI — Primary-side supply voltage |
| Pin 2 | GNDI — Primary-side ground |
| Pin 3 | INA — Input for channel A |
| Pin 4 | INB — Input for channel B |
| Pin 5 | DIS — Disable pin (active high) |
| Pin 6 | DT — Deadtime programming pin |
| Pin 7 | GNDI — Primary-side ground |
| Pin 8 | VDDA — Secondary-side supply for channel A |
| Pin 9 | OUTA — Output for channel A |
| Pin 10 | GNDA — Secondary-side ground for channel A |
| Pin 11 | GNDB — Secondary-side ground for channel B |
| Pin 12 | OUTB — Output for channel B |
| Pin 13 | VDDB — Secondary-side supply for channel B |
| Pin 14 | GNDI — Primary-side ground |
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
UCC21540 is suitable for 6 applications: Server and Telecom Power Supplies, Industrial Motor Drives, Solar Inverters, Electric Vehicle Onboard Chargers, Renewable Energy Systems, High-Frequency Switching Converters.
Server and Telecom Power Supplies
The UCC21540's 4A/6A drive current and 5.7-kVRMS isolation make it ideal for driving MOSFETs in high-frequency DC-DC converters used in server and telecom power supplies. Its fast propagation delay and high CMTI ensure reliable switching at high frequencies, improving efficiency and reducing EMI. The programmable deadtime prevents shoot-through in synchronous rectification stages, enhancing system reliability.
Recommended
Industrial Motor Drives
In industrial motor drives, the UCC21540 drives IGBTs and MOSFETs in the inverter stage. Its reinforced isolation (5.7-kVRMS) and 3.3-mm channel-to-channel spacing allow it to handle high bus voltages up to 800V. The disable pin provides a safety shutdown feature, and the programmable deadtime optimizes switching to reduce losses and prevent shoot-through. The wide operating temperature range (-40°C to +125°C) suits harsh industrial environments.
Recommended
Solar Inverters
The UCC21540 is well-suited for solar inverters, where it drives power switches in the DC-AC conversion stage. Its high isolation voltage and CMTI ensure reliable operation in high-voltage environments. The 4A/6A drive current enables fast switching of SiC and GaN devices, improving inverter efficiency. The programmable deadtime is essential for half-bridge topologies, preventing shoot-through and reducing switching losses.
Recommended
Electric Vehicle Onboard Chargers
In EV onboard chargers, the UCC21540 drives MOSFETs in the PFC and DC-DC stages. Its reinforced isolation meets automotive safety requirements, and the 5.7-kVRMS rating provides robust galvanic isolation. The device's high drive current and fast propagation delay enable efficient high-frequency switching, reducing charger size and weight. The disable pin allows for system-level fault protection, enhancing safety.
Recommended
Renewable Energy Systems
The UCC21540 is used in renewable energy systems such as wind and solar power converters. Its high isolation voltage and robust design ensure reliable operation in outdoor environments. The 4A/6A drive current supports efficient switching of high-power IGBTs and MOSFETs, while the programmable deadtime optimizes performance in half-bridge and full-bridge topologies. The device's wide temperature range and high CMTI make it suitable for harsh conditions.
Recommended
High-Frequency Switching Converters
The UCC21540 is designed for high-frequency switching converters, such as LLC resonant converters and synchronous buck converters. Its low propagation delay and high CMTI enable operation at frequencies above 1 MHz, improving power density. The 4A/6A drive current ensures fast switching of GaN and SiC devices, reducing losses. The programmable deadtime is critical for preventing shoot-through in synchronous rectification.
Recommended
Recommended Products Summary
Engineering reference data for UCC21540 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | UCC21540A | UCC21541 | UCC21520 | UCC21530 | ADuM4223 |
|---|---|---|---|---|---|---|
| Package | SOIC-14 (DWK) | SOIC-14 (DWK) | SOIC-14 (DWK) | SOIC-16 (DW) | SOIC-14 (DWK) | SOIC-16 (RW) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Peak Source Current | 4 A | 4 A | [DATA_NEEDED] | 4 A | 4 A | 4 A |
| Peak Sink Current | 6 A | 6 A | [DATA_NEEDED] | 4 A | 6 A | 4 A |
| Isolation Rating | 5700 Vrms | 5700 Vrms | 5700 Vrms | 5700 Vrms | 5700 Vrms | 5000 Vrms |
| Output VDD Range | 6.5V to 18V | 6.5V to 18V | 6.5V to 18V | 6.5V to 25V | 6.5V to 18V | 4.5V to 18V |
| Deadtime Programming | Yes | Yes | Yes | Yes | Yes | No |
| Disable Pin | Yes | Yes | Yes | Yes | Yes | No |
Key Differentiators
- Higher drive current (4A/6A) compared to UCC21520 (4A/4A) (vs UCC21520)
- Reinforced isolation with 3.3mm channel-to-channel spacing (vs ADuM4223)
- Programmable deadtime and disable pin (vs ADuM4223)
Design Notes
For the UCC21540, maintain at least 3.3mm clearance between the high-voltage and low-voltage sides on the PCB to meet the reinforced isolation rating. Use proper creepage distances and consider a slot in the PCB under the device to enhance isolation. Place decoupling capacitors (0.1uF and 10uF) close to the VDD pins to ensure stable operation.
The UCC21540's power dissipation is primarily from switching losses in the output stage. At high frequencies, ensure adequate copper area on the PCB for heat dissipation. The SOIC-14 package has a thermal resistance of approximately 100°C/W; for high-power applications, consider adding thermal vias and a ground plane to improve heat transfer.
Do not exceed the absolute maximum ratings, especially the output-side VDD of 18V. Ensure the deadtime is set appropriately to prevent shoot-through in half-bridge configurations. The disable pin should be tied to a defined logic level to avoid floating inputs. Also, verify that the input signals meet the required logic thresholds.
Compliance Information
RoHS compliant per TI product page. AEC-Q100 qualification not specified for standard UCC21540; automotive variants may be available.
