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Skyworks Solutions Inc. SI82521CD-IS3
- Part No.:
- SI82521CD-IS3
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI82521CD-IS3.pdf
- Description:
- DGTL ISO 5KV 1CH GATE DVR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,067
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Product details
Overview
SI82521CD-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-voltage switching applications. It delivers 4.0 A peak sink/source output current, supports up to 5 kVRMS isolation, features 30 ns max propagation delay, and operates across –40 °C to +125 °C ambient temperature - enabling use in solar inverters, traction inverters, and on-board chargers.
For engineers reviewing the SI82521CD-IS3 datasheet, SI82521CD-IS3 pinout, SI82521CD-IS3 application, or SI82521CD-IS3 equivalent, this page provides verified functional identity, WB SOIC-14 package mapping, confirmed EN-pin logic behavior, programmable dead time (40–600 ns), and automotive-grade AEC-Q100 qualification status per the official Skyworks 206413B datasheet.
Technical Context
The SI82521CD-IS3 implements RF-based isolation with a semiconductor barrier, delivering 125 kV/µs CMTI and eliminating startup initialization. Its dual-channel architecture separates input-side control (VDDIH = 4.5–20 V) from independent output-side supplies (VDDA/VDDB = 5.5–30 V), each with dedicated UVLO thresholds and thermal shutdown at >150 °C.
Each channel integrates a booster pull-up stage combining PMOS and NMOS devices to deliver enhanced Miller plateau drive (up to +3 A peak boost), enabling fast turn-on of high-capacitance power switches. The EN pin enables fail-safe operation: outputs default low when VDDIH is unpowered or during UVLO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 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 high-gate-charge SiC MOSFETs and IGBTs in hard-switching topologies. |
| Propagation Delay | ≤30 ns - enables precise timing control in high-frequency (>100 kHz) motor drives and DC-DC converters. |
| Common-Mode Transient Immunity | ≥125 kV/µs - ensures reliable operation in noisy high-dV/dt environments like traction inverters. |
| Programmable Dead Time | 40–600 ns via external resistor - prevents shoot-through in half-bridge configurations without requiring controller-level dead-time insertion. |
| Operating Temperature | –40 °C to +125 °C - qualified for industrial and automotive under-hood applications per AEC-Q100 Grade 1. |
| Input Logic Compatibility | TTL-level (VIH = 1.6–2.0 V, VIL = 0.8–1.2 V) - interoperable with standard microcontrollers and PWM controllers without level-shifting. |
| Supply Voltage Ranges | VDDIH = 4.5–20 V; VDDA/VDDB = 5.5–30 V - supports flexible biasing in multi-rail systems including bootstrap and isolated DC-DC supplies. |
Pinout & Package
SI82521CD-IS3 is housed in a RoHS-compliant Wide Body SOIC-14 (WB SOIC-14) package with 8.0 mm creepage/clearance, rated for 5 kVRMS isolation and 1500 VDC driver-to-driver differential voltage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIA | Non-inverting logic input for Driver A | Accepts TTL-level signal to control high-side output VOA; referenced to GNDI. |
| VIB | Non-inverting logic input for Driver B | Accepts TTL-level signal to control low-side output VOB; referenced to GNDI. |
| VDDIH | Input-side high-voltage supply | Power source for isolation barrier and input logic (4.5–20 V); UVLO threshold = 3.2–4.4 V rising. |
| GNDI | Input-side ground reference | Return path for VIA, VIB, EN, DT, and VDDIH; galvanically isolated from GNDA/GNDB. |
| EN | Enable control input | Active-high logic: drives VOA/VOB low when low or floating; internal 100 kΩ pull-down. |
| DT | Dead time programming input | Resistor-to-ground sets dead time (40–600 ns); no external capacitor required. |
| VDDA | Driver A power supply | Supplies high-side output stage (5.5–30 V); independent UVLO monitoring. |
| VOA | Driver A output (high-side) | Drives gate of high-side switch; includes booster stage for Miller plateau region. |
| GNDA | Driver A ground | Return for VDDA and VOA; isolated from GNDI and GNDB. |
| VDDB | Driver B power supply | Supplies low-side output stage (5.5–30 V); independent UVLO monitoring. |
| VOB | Driver B output (low-side) | Drives gate of low-side switch; matched timing with VOA for synchronous operation. |
| GNDB | Driver B ground | Return for VDDB and VOB; isolated from GNDI and GNDA. |
Key Features
| Feature | Design Value |
|---|---|
| Dual isolated drivers in single WB SOIC-14 | Reduces PCB area vs. discrete optocoupler + gate driver solutions; eliminates inter-channel coupling risk. |
| Booster-assisted pull-up stage | Delivers +3 A peak boost during Miller plateau, cutting turn-on time by up to 40% vs. standard 1 A drivers. |
| Fail-safe default-low outputs | VOA and VOB automatically go low if VDDIH drops below UVLO or is unpowered - prevents unintended power switch activation. |
| Programmable dead time with no overlap | Hardware-enforced dead time prevents shoot-through even if controller logic fails or experiences timing jitter. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including on-board chargers and traction inverters with full PPAP support. |
| 125 kV/µs CMTI | Immune to noise from fast-switching SiC/GaN power stages - eliminates false triggering in high-power inverters. |
Applications
| Solar Inverters | Traction Inverters |
|---|---|
|
Use Scenario: Driving half-bridge IGBTs in string-level MPPT inverters with 1000 V DC bus. IC Role / Device Role / Timing Role: High-side/low-side isolated gate driver providing synchronized, shoot-through-free switching at 16–20 kHz. Use Value: 30 ns propagation delay and 125 kV/µs CMTI ensure clean switching despite rapid bus transients during grid faults. |
Use Scenario: Controlling 650 V SiC MOSFETs in EV traction inverters operating at 8–12 kHz PWM frequency. IC Role / Device Role / Timing Role: Dual-channel isolated driver with programmable dead time enforcing safe commutation in motor phase legs. Use Value: Booster-assisted pull-up reduces gate charge time, improving efficiency by ≥1.2% at 150 kW output. |
| On-Board Chargers (OBC) | Battery Management Systems (BMS) |
|
Use Scenario: Driving AC-DC PFC and DC-DC isolation stages in 11 kW bi-directional OBCs. IC Role / Device Role / Timing Role: Isolated gate driver enabling high-efficiency interleaved totem-pole PFC with zero-voltage switching. Use Value: 5 kVRMS isolation and reinforced insulation certification (VDE/UL/CSA) meet automotive safety standards for 400 V battery systems. |
Use Scenario: Controlling active balancing FETs and contactor drivers in high-voltage (800 V) modular BMS stacks. IC Role / Device Role / Timing Role: Fail-safe isolated driver ensuring contactors de-energize immediately upon loss of control power. Use Value: Default-low behavior on VDDIH undervoltage prevents hazardous contactor closure during brownout conditions. |
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 |
|---|---|---|---|
| Si82520CD-IS3 | Uses DIS (disable) pin instead of EN; identical isolation, timing, and drive specs. | Preferred where safety-critical systems require active-low disable signaling (e.g., ISO 26262 ASIL-B fault handling). | Select Si82520CD-IS3 only if controller interface mandates active-low disable; otherwise SI82521CD-IS3 offers simpler enable logic. |
| ADuM4223BRIZ | Lower peak drive (4 A sink / 2.5 A source); 25 kV/µs CMTI; 3.75 kVRMS isolation; SOIC-16 package. | Suitable for lower-power industrial motor drives (<5 kW) but not recommended for automotive traction or 1500 V solar systems. | Choose ADuM4223BRIZ only for cost-sensitive non-automotive designs where 5 kVRMS and 125 kV/µs immunity are not required. |
Compared with Si82520CD-IS3 and ADuM4223BRIZ, SI82521CD-IS3 uniquely combines AEC-Q100 qualification, 5 kVRMS isolation, and 125 kV/µs CMTI in a WB SOIC-14 footprint - making it the only option qualified for high-reliability automotive traction and grid-tied solar applications.
Availability
SI82521CD-IS3 is available at Aetrix Electronics and suitable for solar inverters, traction inverters, and on-board chargers requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.
Supply support for SI82521CD-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 leader in analog semiconductors, specializing in RF, isolation, and precision timing technologies for high-performance wireless and power systems.
The SI82521CD-IS3 belongs to Skyworks' Si8252x ISODriver family, engineered specifically for robust, high-speed gate driving in automotive electrification and renewable energy systems demanding reinforced insulation and fail-safe behavior.
FAQ
What is the isolation voltage rating of the SI82521CD-IS3?
The SI82521CD-IS3 is rated for 5 kVRMS isolation for one minute per UL 1577, with production-tested 6.0 kVRMS surge capability. This rating applies to the WB SOIC-14 package and is certified under VDE 62368-1 and CSA 62368-1 for reinforced insulation up to 600 VRMS working voltage.
Does the SI82521CD-IS3 support both high-side and low-side gate driving simultaneously?
Yes, the SI82521CD-IS3 integrates two fully isolated drivers - VOA (high-side) and VOB (low-side) - with independent power supplies (VDDA and VDDB) and grounds (GNDA and GNDB). Each channel operates with matched propagation delay (≤30 ns) and skew (≤5 ns), enabling synchronous half-bridge control.
How does the EN pin function on the SI82521CD-IS3?
The EN pin on the SI82521CD-IS3 is an active-high enable input. When pulled high, the device operates normally; when low or floating, VOA and VOB are unconditionally driven low regardless of VIA/VIB states. An internal 100 kΩ pull-down ensures safe default behavior if left unconnected.
What is the purpose of the DT pin on the SI82521CD-IS3?
The DT pin on the SI82521CD-IS3 sets programmable dead time between VOA and VOB transitions using a single resistor to ground. With RDT = 6–100 kΩ, dead time ranges from 40–600 ns, preventing shoot-through in half-bridge configurations without relying on controller-level timing margins.
Is the SI82521CD-IS3 qualified for automotive applications?
Yes, the SI82521CD-IS3 is AEC-Q100 Grade 1 qualified (–40 °C to +125 °C), with AIAG-compliant PPAP documentation, IMDS/CAMDS listings, and automotive-specific manufacturing flows. It is approved for use in on-board chargers, traction inverters, and battery management systems in BEV/HEV platforms.
SI82521CD-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
SI82521CD-IS3 FAQ
1.How can I place an order for SI82521CD-IS3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI82521CD-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 SI82521CD-IS3 reliable?
The price and inventory of SI82521CD-IS3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI82521CD-IS3 is usually 5 days.
3.What payment methods are accepted for SI82521CD-IS3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI82521CD-IS3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI82521CD-IS3?
SI82521CD-IS3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI82521CD-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 SI82521CD-IS3?
For technical support, including SI82521CD-IS3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI82521CD-IS3 requirements.
6.How does Aetrix verify that SI82521CD-IS3 is sourced from the original manufacturer or authorized distributors?
All SI82521CD-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 SI82521CD-IS3 meets industry standards.
7.What is the process for return or replacement of SI82521CD-IS3?
All SI82521CD-IS3 units undergo pre-shipment inspection (PSI). If there is an issue with SI82521CD-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 SI82521CD-IS3 part is unused and in its original packaging.
Return procedure for SI82521CD-IS3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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