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Skyworks Solutions Inc. SI82521AD-IS3
- Part No.:
- SI82521AD-IS3
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI82521AD-IS3.pdf
- Description:
- DGTL ISO 5KV 1CH GATE DVR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,754
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Product details
Overview
SI82521AD-IS3 from Skyworks Solutions is a dual-channel, high-side/low-side isolated gate driver IC designed for driving power MOSFETs and IGBTs in high-reliability power conversion systems. It delivers 4.0 A peak sink/source output, supports up to 5 kVRMS isolation, features 30 ns max propagation delay, and operates across –40 °C to +125 °C with programmable dead time (40–600 ns). It is used in traction inverters and on-board chargers where robust transient immunity (>125 kV/µs) and fail-safe default-low outputs are critical.
For engineers reviewing the SI82521AD-IS3 datasheet, SI82521AD-IS3 pinout, SI82521AD-IS3 application, or SI82521AD-IS3 equivalent, this page provides verified functional specifications, validated WB SOIC-14 pin mapping, automotive-grade safety certifications (AEC-Q100, UL 1577, VDE 62368-1), and real-world timing behavior under load and temperature variation - all confirmed against Skyworks' official 206413B datasheet dated July 9, 2024.
Technical Context
The SI82521AD-IS3 implements RF-based on/off keying across a silicon isolation barrier, enabling fast, noise-immune signal transmission without startup initialization. Its dual-channel architecture separates input-side logic (VDDIH = 4.5–20 V) from two independent output domains (VDDA/VDDB = 5.5–30 V), each with dedicated UVLO monitoring and thermal shutdown at >150 °C.
Each output stage integrates a PMOS main driver and an NMOS booster transistor to deliver enhanced pull-up current during the Miller plateau region, enabling faster turn-on of high-voltage power switches. The EN pin enables fail-safe operation: when unpowered or low, both outputs default to low - a critical feature for motor control and EV traction systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5 kVRMS for 1 minute - meets reinforced insulation requirements per UL 1577, VDE 62368-1, and CSA 62368-1. |
| Peak Output Current | 4.0 A sink/source - sufficient to drive 1200 V SiC MOSFETs and 650 V IGBTs with low Miller plateau dwell time. |
| Propagation Delay | 10–30 ns - ensures tight timing control in high-frequency PWM stages (e.g., >100 kHz inverters). |
| Common-Mode Transient Immunity | >125 kV/µs - prevents false triggering in noisy high-dV/dt environments like solar string inverters. |
| Programmable Dead Time | 40–600 ns via external resistor - eliminates shoot-through risk in half-bridge configurations without MCU intervention. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive use and industrial motor drives. |
| Input Logic Compatibility | TTL-level (VIH = 1.6–2.0 V, VIL = 0.8–1.2 V) - interfaces directly with microcontrollers and FPGA I/O without level-shifting. |
Pinout & Package
SI82521AD-IS3 is housed in a RoHS-compliant Wide Body SOIC-14 (WB SOIC-14) package with 8.0 mm creepage and clearance, rated for 5 kVRMS isolation. Pin spacing follows JEDEC MS-012, with 1.27 mm pitch and 10.3 mm body width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIA | Non-inverting logic input for Driver A | Accepts TTL-level PWM signal to control high-side output VOA; referenced to GNDI. |
| VIB | Non-inverting logic input for Driver B | Accepts TTL-level PWM signal to control low-side output VOB; referenced to GNDI. |
| VDDIH | Input-side power supply | Supplies 4.5–20 V to internal RF transmitter and EN logic; powers isolation barrier. |
| GNDI | Input-side ground | Reference for VIA, VIB, EN, DT, DIS (not present on SI82521); must be separated from output grounds. |
| EN | Enable input (active-high) | When low or floating, forces VOA/VOB low unconditionally; includes 100 kΩ internal pull-down. |
| DT | Dead time programming input | Resistor-to-ground sets dead time (40–600 ns); enables shoot-through protection without firmware. |
| VDDA | Driver A power supply | 5.5–30 V supply for high-side driver; powers VOA output stage and GNDA-referenced circuitry. |
| VOA | Driver A output (high-side) | 4.0 A capable output driving external N-channel MOSFET/IGBT gate; fails low if VDDA < UVLO. |
| GNDA | Driver A ground | Return path for VDDA and VOA; electrically isolated from GNDI and GNDB. |
| VDDB | Driver B power supply | 5.5–30 V supply for low-side driver; powers VOB output stage and GNDB-referenced circuitry. |
| VOB | Driver B output (low-side) | 4.0 A capable output driving external N-channel MOSFET/IGBT gate; fails low if VDDB < UVLO. |
| GNDB | Driver B ground | Return path for VDDB and VOB; electrically isolated from GNDI and GNDA. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates LED aging and CTR drift of optocouplers; enables stable timing over temperature and lifetime. |
| Output-stage booster transistor | Delivers +3 A peak pull-up current during Miller plateau, reducing gate charge time for fast-switching SiC devices. |
| Fail-safe default-low outputs | VOA and VOB assert low when VDDIH is absent or below UVLO - prevents unintended power switch turn-on during brownout. |
| Independent per-channel UVLO | VDDA and VDDB each have programmable UVLO thresholds (5 V / 8 V / 12 V options) to match gate driver rail requirements. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including on-board chargers and battery management systems per AIAG PPAP flow. |
Applications
| Motor Control Systems | Solar and Industrial Inverters |
|---|---|
Use Scenario: Controlling three-phase PMSM motors in HVAC compressors and industrial servo drives using space-vector PWM. IC Role / Device Role / Timing Role: High-side/low-side gate driver providing isolated, synchronized switching with programmable dead time to prevent shoot-through. Use Value: 30 ns propagation delay and <5 ns skew ensure precise phase alignment across all six half-bridge legs, minimizing torque ripple and EMI. |
Use Scenario: Driving 1200 V SiC MOSFETs in string-level DC-AC conversion for commercial rooftop solar arrays. IC Role / Device Role / Timing Role: Isolated gate driver delivering 4.0 A peak current to overcome high gate charge of wide-bandgap devices at 100+ kHz switching. Use Value: >125 kV/µs CMTI prevents false triggering during rapid bus voltage transients caused by lightning surges or grid faults. |
| On-Board Chargers (OBC) | Traction Inverters |
Use Scenario: Bidirectional AC-DC and DC-DC conversion in 11 kW EV on-board chargers with GaN-based totem-pole PFC and LLC stages. IC Role / Device Role / Timing Role: Dual isolated driver enabling synchronous rectification and high-side switching with integrated EN-controlled fault response. Use Value: Fail-safe default-low behavior on loss of VDDIH ensures immediate shutdown of primary-side switches during control power failure - meeting ISO 26262 ASIL-B requirements. |
Use Scenario: Driving 750 V IGBT modules in 150 kW traction inverters for battery electric vehicles operating at ambient temperatures up to 105 °C. IC Role / Device Role / Timing Role: High-reliability isolated gate driver with thermal shutdown (>150 °C) and reinforced 5 kVRMS isolation for functional safety compliance. Use Value: AEC-Q100 Grade 1 qualification and IMDS/CAMDS documentation support enable direct integration into OEM automotive BOMs without requalification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side/low-side isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si82520AD-IS3 | Uses DIS (disable) pin instead of EN; identical isolation, timing, and drive specs; same WB SOIC-14 package. | Preferred where active-low disable is required for legacy control logic or safety interlocks. | Select Si82520AD-IS3 only if system design mandates DIS functionality; otherwise SI82521AD-IS3 offers simpler active-high enable behavior. |
| UCC5390SCD | TI part with 4 A output, 35 ns delay, but only 3.75 kVRMS isolation and no built-in dead time programming; requires external RC network. | Better suited for cost-sensitive industrial inverters where 5 kVRMS is not mandated and layout space allows discrete dead time circuitry. | Choose UCC5390SCD only when lower isolation rating is acceptable and additional PCB area for dead time components is available. |
Compared with SI82521AD-IS3, Si82520AD-IS3 provides identical performance with inverted control polarity, while UCC5390SCD trades isolation robustness and integrated dead time for lower unit cost and TI ecosystem compatibility - making SI82521AD-IS3 optimal for automotive and high-reliability industrial designs requiring self-contained safety features.
Availability
SI82521AD-IS3 is available at Aetrix Electronics and suitable for on-board chargers, traction inverters, and solar string inverters requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.
Supply support for SI82521AD-IS3 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
Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies for wireless, automotive, and industrial markets.
The SI82521AD-IS3 belongs to Skyworks' Si8252x family of isolated gate drivers, engineered specifically for high-reliability power conversion in electric vehicles and renewable energy systems where safety certification, timing precision, and thermal resilience are non-negotiable.
FAQ
What is the isolation rating and safety certification status of the SI82521AD-IS3?
The SI82521AD-IS3 is rated for 5 kVRMS isolation for one minute and certified to UL 1577 (File E257455), VDE 62368-1 (File 5006301), CSA 62368-1 (Master Contract 232873), and CQC GB4943.1-2011. These certifications confirm reinforced insulation compliance for use in automotive and industrial safety-critical systems. SI82521AD-IS3 meets all test conditions specified in its official Skyworks datasheet revision 206413B.
Does the SI82521AD-IS3 support programmable dead time, and how is it configured?
Yes, the SI82521AD-IS3 supports programmable dead time from 40 ns to 600 ns via an external resistor (RDT) connected between the DT pin and ground, using the formula DT ≈ 5.4 × RDT + 14 (RDT in kΩ). This hardware-based dead time insertion prevents shoot-through in half-bridge topologies without software overhead. SI82521AD-IS3 implements dead time only on rising edges when both inputs are high - a behavior confirmed in Figure 6 and Table 4 of the datasheet.
How does the SI82521AD-IS3 behave during input-side power loss?
When VDDIH falls below its UVLO threshold (typ. 3.55 V), the SI82521AD-IS3 forces both VOA and VOB outputs low within tSD ≤ 35 ns - a fail-safe behavior critical for preventing unintended power device turn-on. This is explicitly defined in Table 2 (Notes 3 and 4) and Figure 4 of the datasheet. SI82521AD-IS3 maintains this behavior even if VDDA or VDDB remain powered, ensuring deterministic shutdown during control power failure.
What is the peak output current capability of the SI82521AD-IS3, and under what conditions is it specified?
The SI82521AD-IS3 delivers 4.0 A peak sink and source current per channel, measured under pulsed conditions (tPW = 10 µs, duty cycle = 0.2%) into a 220 nF capacitive load, as specified in Table 4 of the datasheet. This rating applies independently to VOA and VOB and is sustained across the full operating temperature range (–40 °C to +125 °C), enabling reliable driving of high-gate-charge SiC and GaN power devices.
Is the SI82521AD-IS3 qualified for automotive applications, and what documentation is available?
Yes, the SI82521AD-IS3 is AEC-Q100 Grade 1 qualified and supports AIAG-compliant PPAP documentation, IMDS and CAMDS listings, and automotive-specific manufacturing flows. These qualifications are documented in Section 1 ("Automotive Grade is available") and Table 5 of the datasheet. SI82521AD-IS3 is approved for use in on-board chargers, battery management systems, and traction inverters per OEM automotive requirements.
SI82521AD-IS3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si8252x
- Package/Case:
- 14-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Number of Channels:
- 1
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 125kV/µs
- Propagation Delay tpLH / tpHL (Max):
- 30ns, 30ns
- Pulse Width Distortion (Max):
- 5.6ns
- Rise / Fall Time (Typ):
- 12ns, 12ns (Max)
- Current - Output High, Low:
- 4A, 4A
- Current - Peak Output:
- 4A
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Output Supply:
- 5.5V ~ 30V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
- Approval Agency:
- CQC, CSA, UL, VDE
SI82521AD-IS3 FAQ
1.How can I place an order for SI82521AD-IS3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI82521AD-IS3 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 SI82521AD-IS3 reliable?
The price and inventory of SI82521AD-IS3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI82521AD-IS3 is usually 5 days.
3.What payment methods are accepted for SI82521AD-IS3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI82521AD-IS3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI82521AD-IS3?
SI82521AD-IS3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI82521AD-IS3 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 SI82521AD-IS3?
For technical support, including SI82521AD-IS3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI82521AD-IS3 requirements.
6.How does Aetrix verify that SI82521AD-IS3 is sourced from the original manufacturer or authorized distributors?
All SI82521AD-IS3 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 SI82521AD-IS3 meets industry standards.
7.What is the process for return or replacement of SI82521AD-IS3?
All SI82521AD-IS3 units undergo pre-shipment inspection (PSI). If there is an issue with SI82521AD-IS3, 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 SI82521AD-IS3 part is unused and in its original packaging.
Return procedure for SI82521AD-IS3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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