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Texas Instruments UCC21521ADW
- Part No.:
- UCC21521ADW
- Manufacturer:
- Texas Instruments
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC21521ADW.pdf
- Description:
- DGTL ISO 5.7KV 2CH GT DVR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,277
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Product details
Overview
UCC21521ADW from Texas Instruments is a reinforced-isolated dual-channel gate driver optimized for high-speed switching of SiC MOSFETs, IGBTs, and power MOSFETs in high-efficiency isolated converters. It delivers 4-A peak source / 6-A peak sink output current, features 5.7-kVRMS isolation, 19-ns typical propagation delay, and 5-V UVLO threshold on VDDA/VDDB - enabling robust operation in 1500-VDC working voltage systems.
For engineers reviewing the UCC21521ADW datasheet, UCC21521ADW pinout, UCC21521ADW application, or UCC21521ADW equivalent, this page provides verified technical context, validated pin functions, confirmed UVLO thresholds (5.2–6.3 V rising), CMTI >100 V/ns, and real-world design implications for motor drives, solar inverters, and telecom power supplies.
Technical Context
The UCC21521ADW implements functional isolation between its two secondary-side drivers, supporting independent high-side, low-side, or half-bridge configurations with programmable dead time via an external resistor on the DT pin (10 ns/kΩ scaling). Its input side uses capacitive isolation across a 5.7-kVRMS reinforced barrier, rated per DIN V VDE V 0884-11:2017-01 and UL 1577.
It integrates dual UVLO protection: 2.55–2.85 V on VCCI and 5.2–6.3 V (rising) on both VDDA and VDDB - specific to the ADW variant - with 0.3-V hysteresis. The EN pin enables fast power sequencing, and internal logic failure detection forces both outputs low as a fail-safe mechanism.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD UVLO Rising Threshold | 5.2–6.3 V - ensures stable gate drive only when secondary supply exceeds safe turn-on level for 5-V UVLO version |
| Propagation Delay (tPD) | 19 ns typical - enables precise timing control up to 5-MHz switching in SiC-based topologies |
| CMTI | >100 V/ns - maintains signal integrity during fast dV/dt transients in high-power inverters |
| Output Drive Strength | 4-A source / 6-A sink - supports fast charging/discharging of large gate capacitances (e.g., 10-nF SiC MOSFETs) |
| Isolation Rating | 5.7-kVRMS reinforced - certified per VDE 0884-11 and UL 1577 for safety-critical AC/DC and UPS systems |
| Operating Temperature | –40°C to +125°C - qualified for industrial and telecom infrastructure environments |
| Package | SOIC-16 (DW), 10.3 mm × 7.5 mm - wide-body layout improves creepage & clearance for reinforced isolation |
Pinout & Package
UCC21521ADW is housed in a wide-body SOIC-16 (DW) package with 10.30 mm × 7.50 mm body size, designed to meet reinforced insulation requirements including >8 mm creepage/clearance and >21 µm internal insulation thickness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA, INB | Primary-side digital inputs | TTL/CMOS-compatible; internally pulled low if floating - require tie-to-ground when unused |
| EN | Global enable control | High or open = normal operation; low = simultaneous shutdown of both outputs |
| DT | Dead-time programming node | Resistor-to-GND sets dead time (10 ns/kΩ); capacitor parallel recommended for noise immunity |
| VCCI | Primary-side logic supply | 3–18 V range - interfaces directly with MCU/FPGA I/O without level-shifting |
| GND | Primary-side reference ground | Common return for all primary-side signals; must be separated from secondary grounds |
| VDDA, VDDB | Independent secondary-side driver supplies | 6.5–25 V each; 5-V UVLO ensures gate drive disabled below safe turn-on voltage |
| OUTA, OUTB | Isolated gate drive outputs | Capable of 4-A source / 6-A sink - drive gates of SiC MOSFETs, IGBTs, or power MOSFETs |
| VSSA, VSSB | Secondary-side output grounds | Functional isolation allows ±1500 VDC working voltage between VSSA and VSSB |
| NC (Pins 7, 12, 13) | No-connect terminals | No internal connection - must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel configuration flexibility | Supports dual low-side, dual high-side, or half-bridge modes - eliminates need for multiple discrete drivers |
| Programmable dead time | Adjustable 0–240 ns via single external resistor on DT pin - enables precise shoot-through prevention in bridge topologies |
| Input pulse rejection | Rejects transients <5 ns - prevents false triggering from EMI or switching noise in noisy power stages |
| Surge immunity | 12.8-kV surge rating per IEC 62368-1 - withstands lightning-induced transients in AC mains-connected equipment |
| Isolation lifetime | >40 years MTTF under rated conditions - validated by TDDB modeling at 1500 VRMS working voltage |
Applications
| Motor Drive Systems | Solar DC-to-AC Inverters |
|---|---|
Use Scenario: Driving SiC MOSFET half-bridges in servo amplifiers and traction inverters operating at 100 kHz–5 MHz. IC Role / Device Role / Timing Role: Isolated gate driver providing independent, high-current turn-on/turn-off control with <5-ns delay matching to minimize cross-conduction. Use Value: Enables 99%+ efficiency in compact motor drives by supporting fast SiC switching while maintaining system-level safety isolation. |
Use Scenario: Controlling H-bridge and NPC topologies in string inverters interfacing PV arrays to grid. IC Role / Device Role / Timing Role: Dual-channel isolated driver delivering synchronized, UVLO-protected gate signals to high- and low-side switches under variable irradiance conditions. Use Value: Ensures reliable startup and fault response across wide input voltage ranges, with CMTI >100 V/ns preventing misfiring during grid transients. |
| Telecom & Server Power Supplies | Uninterruptible Power Supplies (UPS) |
Use Scenario: Gate driving LLC resonant and phase-shifted full-bridge converters in 48-V intermediate bus architectures. IC Role / Device Role / Timing Role: High-speed isolated driver enabling ZVS operation at 300–1000 kHz with precise dead-time control and fast enable/disable sequencing. Use Value: Reduces conduction losses and EMI through tight propagation delay matching (≤5 ns) and low pulse-width distortion (≤6 ns). |
Use Scenario: Driving IGBTs in double-conversion online UPS systems requiring galvanic isolation between control and power stages. IC Role / Device Role / Timing Role: Reinforced-isolated dual driver providing fail-safe shutdown (via EN) and UVLO-locked outputs during brownout or overload events. Use Value: Meets IEC 62368-1 surge immunity (12.8 kV) and 2-MOPP patient protection requirements for medical-grade UPS units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated dual-channel gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC21521DW | 8-V VDD UVLO rising threshold (8–9 V) vs. UCC21521ADW's 5.2–6.3 V; identical pinout, timing, and isolation specs | Better suited for 12-V secondary bias rails where higher UVLO margin prevents nuisance shutdown during rail sag | Select UCC21521DW when VDDA/VDDB nominal is ≥12 V and tighter UVLO hysteresis (0.5 V) is acceptable |
| Si8273BD-D-IS | Lower peak output (4-A source/sink), 5-kVRMS isolation, 25-V max VDD, no programmable dead time; CMOS inputs only | Lacks DT pin and overlap control - requires external logic for dead-time generation in half-bridge use | Choose Si8273BD-D-IS only when simplified control interface and lower cost outweigh need for integrated dead-time tuning |
Compared with UCC21521DW and Si8273BD-D-IS, the UCC21521ADW uniquely combines 5-V UVLO compatibility, programmable dead time, and 6-A sink capability - making it optimal for space-constrained SiC designs requiring precise, self-contained timing control and robust low-voltage rail supervision.
Availability
UCC21521ADW is available at Aetrix Electronics and suitable for motor drives, solar inverters, and telecom power supplies requiring stable component supply, long-lifecycle assurance, and reinforced isolation compliance.
Supply support for UCC21521ADW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability isolation and gate driver innovation.
The UCC21521ADW belongs to TI's UCC2152x family of isolated dual-channel gate drivers, engineered specifically for high-density, high-efficiency power conversion systems using wide-bandgap devices in industrial, automotive, and renewable energy applications.
FAQ
What is the VDD UVLO threshold for UCC21521ADW?
The UCC21521ADW has a 5-V UVLO version: VDDA and VDDB rising UVLO threshold is 5.2–6.3 V, with falling threshold of 4.9–6.0 V and 0.3-V hysteresis. This ensures gate drive remains disabled until secondary supply stabilizes above safe turn-on voltage, preventing partial device conduction in UCC21521ADW-based designs.
How is dead time programmed on UCC21521ADW?
Dead time on UCC21521ADW is set via an external resistor (RDT) between the DT pin and GND: DT (ns) ≈ 10 × RDT (kΩ). For example, a 20-kΩ resistor yields ~200 ns dead time. A ≥2.2-nF ceramic capacitor should be placed in parallel with RDT near the DT pin to suppress noise coupling - a key requirement confirmed in the UCC21521ADW datasheet.
Does UCC21521ADW support half-bridge configuration?
Yes, UCC21521ADW natively supports half-bridge operation by configuring one channel as high-side and the other as low-side, with programmable dead time to prevent shoot-through. Its functional isolation between OUTA and OUTB allows up to 1500 VDC working voltage between VSSA and VSSB - a core capability explicitly specified for UCC21521ADW in TI's documentation.
What safety certifications apply to UCC21521ADW?
UCC21521ADW is certified for reinforced isolation per DIN V VDE V 0884-11:2017-01 (8000-VPK), UL 1577 (5700-VRMS), CSA IEC 60950-1/62368-1, and CQC GB4943.1-2011. These certifications are explicitly listed for the UCC21521ADW variant in TI's official documentation and apply to its DW package construction and test methodology.
Can UCC21521ADW drive SiC MOSFETs?
Yes, UCC21521ADW is explicitly designed to drive SiC MOSFETs up to 5-MHz switching frequency, as stated in its official description. Its 4-A source / 6-A sink peak current, 19-ns propagation delay, and >100 V/ns CMTI meet the stringent timing and noise immunity requirements of SiC-based power stages - a capability confirmed for the UCC21521ADW variant.
UCC21521ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Last Time Buy
- Technology:
- Capacitive Coupling
- Number of Channels:
- 2
- Voltage - Isolation:
- 5700Vrms
- Common Mode Transient Immunity (Min):
- 100V/ns
- Propagation Delay tpLH / tpHL (Max):
- 30ns, 30ns
- Pulse Width Distortion (Max):
- 6ns
- Rise / Fall Time (Typ):
- 6ns, 7ns
- Current - Output High, Low:
- 4A, 6A
- Current - Peak Output:
- -
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Output Supply:
- 6.5V ~ 25V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
- Approval Agency:
- CQC, CSA, UR, VDE
UCC21521ADW FAQ
1.How can I place an order for UCC21521ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC21521ADW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UCC21521ADW reliable?
The price and inventory of UCC21521ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC21521ADW is usually 5 days.
3.What payment methods are accepted for UCC21521ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC21521ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC21521ADW?
UCC21521ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC21521ADW order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UCC21521ADW?
For technical support, including UCC21521ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC21521ADW requirements.
6.How does Aetrix verify that UCC21521ADW is sourced from the original manufacturer or authorized distributors?
All UCC21521ADW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UCC21521ADW meets industry standards.
7.What is the process for return or replacement of UCC21521ADW?
All UCC21521ADW units undergo pre-shipment inspection (PSI). If there is an issue with UCC21521ADW, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UCC21521ADW part is unused and in its original packaging.
Return procedure for UCC21521ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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