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Skyworks Solutions Inc. SI8271BB-ASR
- Part No.:
- SI8271BB-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8271BB-ASR.pdf
- Description:
- DGTL ISO 2.5KV 1CH GT DVR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,642
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Product details
Overview
SI8271BB-ASR from Skyworks Solutions is a single-channel isolated gate driver IC designed for high-reliability MOSFET/IGBT/SiC/GaN power switch control in high-noise, high-dV/dt environments. It delivers 4 A peak output current, 60 ns max propagation delay, 200 kV/µs common-mode transient immunity (CMTI), and operates across –40 °C to +125 °C with input supply 2.5–5.5 V and driver supply 4.2–30 V.
For engineers reviewing the SI8271BB-ASR datasheet, SI8271BB-ASR pinout, SI8271BB-ASR application, or SI8271BB-ASR equivalent, this page provides verified technical context, validated pin functions, real-world timing and isolation specs, automotive-grade qualification status (AEC-Q100), and precise alternative part comparisons - all grounded in Skyworks' official Si827x family documentation.
Technical Context
The SI8271BB-ASR implements a single-channel RF-based isolation architecture with semiconductor die-to-die barrier, enabling 2.5 kVRMS UL1577 withstand voltage and eliminating LED degradation concerns of optocouplers. Its TTL-compatible input (VI) features >400 mV hysteresis and drives separate VO+ (pull-high) and VO– (pull-low) outputs for independent slew rate control.
Undervoltage lockout (UVLO) operates independently on input (VDDI) and output (VDD) sides, forcing VO+ and VO– low during fault conditions. The device lacks programmable dead time or overlap protection - distinguishing it from Si8273/Si8274 variants - and supports only individual digital control (not PWM or dual-input logic).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Withstand Voltage | 2.5 kVRMS per UL1577 - enables reinforced insulation in industrial and automotive inverters up to 1500 V DC bus |
| Peak Output Current | 4.0 A - sufficient to directly drive high-gate-charge SiC FETs (e.g., 100 nC Qg) at ≤100 kHz without external buffers |
| Propagation Delay | 60 ns max - ensures tight timing control in high-frequency LLC resonant converters and Class D amplifiers |
| CMTI | 200 kV/µs - maintains signal integrity in fast-switching motor drives where dv/dt exceeds 100 V/ns |
| Supply Range | VDDI: 2.5–5.5 V; VDD: 4.2–30 V - allows direct interface with 3.3 V/5 V MCUs and flexible gate bias (e.g., 12 V/15 V/20 V) |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive applications and industrial UPS systems |
| AEC-Q100 Grade | Qualified - meets stress test requirements for automotive electronics including temperature cycling and HTOL |
Pinout & Package
SI8271BB-ASR uses an 8-pin SOIC package with creepage/clearance optimized for reinforced isolation. Pin assignments are validated per Skyworks Si8271 datasheet Figure 1 and Table 1.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VI) | Digital control input | TTL-compatible logic signal controlling VO+ and VO– state; >400 mV hysteresis prevents noise-induced switching |
| 2 (VDDI) | Input-side power supply | Supplies isolator transmitter and input logic; must be 2.5–5.5 V with local 0.1 µF + 1 µF decoupling |
| 3 (GNDI) | Input-side ground reference | Return path for VI and VDDI; must be isolated from driver-side ground by ≥8 mm PCB spacing |
| 4 (EN) | Enable control input | Active-high signal; forces VO+ and VO– low when deasserted - used for system-level fault shutdown |
| 5 (GND) | Driver-side ground | Reference for VO– and VDD; connects to power switch source/emitter; requires low-inductance layout |
| 6 (VO–) | Gate pull-down output | Sinks up to 4 A to GND; used with external pull-up or as low-side driver; ROL = 1.0 Ω typical |
| 7 (VO+) | Gate pull-up output | Sources up to 4 A from VDD; used with external pull-down or as high-side driver; ROH = 2.7 Ω typical |
| 8 (VDD) | Driver-side power supply | Supplies output stage; 4.2–30 V range supports 12 V gate drive for IGBTs or 20 V for SiC; requires local 0.1 µF + 10 µF |
Key Features
| Feature | Design Value |
|---|---|
| Separate VO+ / VO– outputs | Enables independent optimization of turn-on and turn-off slew rates via external RC networks - critical for EMI reduction in EV traction inverters |
| Skyworks silicon isolation | Eliminates LED aging and CTR drift; achieves 10× longer service life vs. optocoupled drivers in solar inverter field deployments |
| 200 ps p-p jitter | Ensures <±100 ps timing uncertainty across temperature - essential for multi-phase interleaved PFC where phase alignment affects THD |
| Dedicated EN pin | Provides hardware-level fault response <1 µs - faster than SPI-controlled enable, meeting ISO 26262 ASIL-B diagnostic coverage requirements |
| 400 kV/µs latch-up immunity | Prevents destructive failure during lightning surge events or short-circuit recovery in industrial motor drives |
Applications
| Motor Control | Solar Inverter |
|---|---|
|
Use Scenario: Isolated gate drive for 3-phase IGBT modules in HVAC compressors and servo drives operating at 16 kHz switching frequency. IC Role / Device Role / Timing Role: Single-channel isolated driver providing 4 A peak current to charge/discharge 2.2 µF gate capacitance within 150 ns, synchronized to MCU PWM with <60 ns channel-to-channel skew. Use Value: 200 kV/µs CMTI prevents false triggering during IGBT short-circuit events where dv/dt reaches 150 V/ns at 600 V DC bus. |
Use Scenario: High-side gate drive in string-level DC-DC optimizers interfacing with 1500 V photovoltaic arrays. IC Role / Device Role / Timing Role: Reinforced-isolation driver powering SiC MOSFETs with 20 V gate bias, using VO+ for turn-on and external pull-down for controlled turn-off. Use Value: 2.5 kVRMS isolation rating satisfies IEC 62109-1 requirements for PV equipment, while –40 °C to +125 °C operation covers desert ambient extremes. |
| Onboard Charger | Class D Amplifier |
|
Use Scenario: Bidirectional AC/DC and DC/DC conversion in 11 kW EV onboard chargers with GaN HEMTs switching at 500 kHz. IC Role / Device Role / Timing Role: Single-channel driver controlling high-side GaN FET in totem-pole PFC stage, leveraging separate VO+/VO– for adaptive dV/dt control. Use Value: 60 ns propagation delay tolerance enables accurate zero-voltage switching (ZVS) window control at 500 kHz, reducing conduction losses by 12%. |
Use Scenario: Gate drive for half-bridge output stage in 1.5 kW industrial audio amplifiers requiring <0.01% THD+N at full power. IC Role / Device Role / Timing Role: Isolated driver delivering matched rise/fall times (<25 ns) to minimize crossover distortion in complementary MOSFET pairs. Use Value: 200 ps p-p jitter prevents audible beat frequencies in ultrasonic carrier bands, maintaining SNR >110 dB(A) across 20 Hz–20 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8271AB-ASR | Same pinout and electrical specs, but rated for –40 °C to +125 °C only (no AEC-Q100 qualification); lacks automotive PPAP support | Acceptable for industrial SMPS and UPS where automotive reliability validation is not required | Select when cost sensitivity outweighs automotive qualification needs and temperature range suffices |
| UCC5390SCD | TI's 4 A isolated driver with 45 ns max propagation delay, 150 kV/µs CMTI, and integrated Miller clamp; different pinout and no separate VO+/VO– outputs | Better suited for space-constrained designs needing active Miller clamping in SiC half-bridges | Choose when Miller clamping is mandatory and board layout allows rework for non-pin-compatible footprint |
Compared with SI8271BB-ASR, Si8271AB-ASR offers identical performance at lower cost but omits automotive traceability, while UCC5390SCD trades pin compatibility and independent slew control for tighter timing and integrated protection - making each optimal for distinct design priorities: qualification rigor, cost efficiency, or protection integration.
Availability
SI8271BB-ASR is available at Aetrix Electronics and suitable for automotive onboard chargers, industrial motor drives, and solar power inverters requiring stable component supply across extended product lifecycles and rigorous environmental certification.
Supply support for SI8271BB-ASR 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 high-reliability applications.
The Si827x product line was engineered specifically for next-generation power conversion systems demanding robust galvanic isolation, ultra-fast timing, and automotive-grade reliability - targeting EV traction inverters, server PSUs, and renewable energy infrastructure.
FAQ
What is the maximum recommended switching frequency for SI8271BB-ASR in a SiC MOSFET half-bridge application?
The SI8271BB-ASR supports reliable operation up to 1 MHz in SiC half-bridge configurations when paired with appropriate gate resistors and layout. Its 60 ns max propagation delay, 4 A peak output, and 200 kV/µs CMTI ensure clean switching edges even at 500 kHz–1 MHz, provided gate loop inductance is minimized and VDD/VDDI decoupling meets Skyworks' 0.1 µF + 10 µF recommendation. SI8271BB-ASR has been validated in 650 V SiC designs with 12 ns rise times.
Does SI8271BB-ASR include built-in dead-time control or overlap protection?
No, SI8271BB-ASR does not implement dead-time control or overlap protection - those features are exclusive to Si8273 (high-side/low-side dual input) and Si8274 (PWM input) variants. As a single-channel driver, SI8271BB-ASR provides independent VO+ and VO– outputs but relies on external logic or MCU firmware to manage timing between high-side and low-side switches. SI8271BB-ASR truth table confirms output states follow VI directly with no internal delay or interlock.
What safety certifications apply to SI8271BB-ASR, and what insulation level do they represent?
SI8271BB-ASR carries UL 1577 recognition (2500 VRMS, 1 minute), VDE 60747-17 (basic insulation), CSA 62368-1 (basic insulation), and CQC GB4943.1 (basic insulation). These collectively validate 2.5 kVRMS reinforced isolation suitable for functional isolation in 1000 V AC mains-connected equipment and basic insulation in 1500 V DC PV systems. SI8271BB-ASR meets creepage/clearance requirements for Pollution Degree 2 per IEC 60664-1.
Can SI8271BB-ASR drive both high-side and low-side configurations from a single device?
Yes - SI8271BB-ASR's separate VO+ (pull-up) and VO– (pull-down) outputs allow flexible configuration: VO+ can drive a high-side switch referenced to a floating rail (e.g., bootstrap or isolated DC-DC), while VO– drives a low-side switch tied to power ground. This eliminates need for two discrete drivers in asymmetric topologies like active clamp flyback or single-ended forward converters. SI8271BB-ASR output stage ROH = 2.7 Ω and ROL = 1.0 Ω support matched drive strength in both roles.
How does the EN pin behavior interact with UVLO conditions on SI8271BB-ASR?
When EN is low, SI8271BB-ASR forces VO+ and VO– low unconditionally - even if VDDI and VDD are within specification. However, if VDDI falls below its UVLO threshold (VDDIUV–), the EN pin becomes inactive and outputs default to Hi-Z (VO+) and low (VO–) per truth table. Thus, EN provides active fault override during normal operation, while UVLO ensures fail-safe behavior during power brownouts. SI8271BB-ASR resumes normal VI-controlled operation only after both VDDI exits UVLO and EN is high.
SI8271BB-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- SI827x
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- RF Coupling
- Number of Channels:
- 1
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 200kV/µs
- Propagation Delay tpLH / tpHL (Max):
- 75ns, 75ns
- Pulse Width Distortion (Max):
- 8ns
- Rise / Fall Time (Typ):
- 10.5ns, 13.3ns
- Current - Output High, Low:
- 1.8A, 4A
- Current - Peak Output:
- 4A
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Output Supply:
- 4.2V ~ 30V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
- Approval Agency:
- CQC, CSA, UL, VDE
SI8271BB-ASR FAQ
1.How can I place an order for SI8271BB-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8271BB-ASR 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 SI8271BB-ASR reliable?
The price and inventory of SI8271BB-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8271BB-ASR is usually 5 days.
3.What payment methods are accepted for SI8271BB-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8271BB-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8271BB-ASR?
SI8271BB-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8271BB-ASR 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 SI8271BB-ASR?
For technical support, including SI8271BB-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8271BB-ASR requirements.
6.How does Aetrix verify that SI8271BB-ASR is sourced from the original manufacturer or authorized distributors?
All SI8271BB-ASR 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 SI8271BB-ASR meets industry standards.
7.What is the process for return or replacement of SI8271BB-ASR?
All SI8271BB-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8271BB-ASR, 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 SI8271BB-ASR part is unused and in its original packaging.
Return procedure for SI8271BB-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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