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Skyworks Solutions Inc. SI8271ABD-AS
- Part No.:
- SI8271ABD-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8271ABD-AS.pdf
- Description:
- DGTL ISO 2.5KV 1CH GT DVR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,231
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Product details
Overview
SI8271ABD-AS from Skyworks Solutions is a single-channel isolated gate driver IC designed for high-reliability MOSFET/IGBT/SiC/GaN power switch control in isolated half-bridge topologies. It delivers 4 A peak output current, supports 2.5 kVRMS isolation (UL1577), achieves ≤60 ns propagation delay, and features separate VO+ / VO– outputs with independent pull-up/pull-down capability for precise slew rate control - deployed in solar inverters and motor drives requiring robust dV/dt immunity.
For engineers reviewing the SI8271ABD-AS datasheet, SI8271ABD-AS pinout, SI8271ABD-AS application, or SI8271ABD-AS equivalent, this page provides verified technical context, validated pin functions, confirmed CMTI (200 kV/µs), exact UVLO thresholds, and two rigorously cross-checked alternative parts - all aligned to Skyworks' official Si8271 family documentation.
Technical Context
The SI8271ABD-AS implements RF-based on/off keying across a silicon isolation barrier, eliminating startup initialization and enabling deterministic timing without external clocks. Its architecture includes independent input-side (VDDI/GNDI) and driver-side (VDD/VO+/VO−/GND) domains, with dedicated enable (EN) and undervoltage lockout (UVLO) monitoring per supply rail.
It operates as a single-input, single-output isolated driver with TTL-compatible VI input (>400 mV hysteresis), 2.5–5.5 V input supply range, and 4.2–30 V driver supply range. Output behavior defaults to low during VDDI UVLO, and VO+ / VO− are actively driven - not open-drain - enabling direct gate charging/discharging without external pull resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Withstand Voltage | 2.5 kVRMS per UL1577 - enables reinforced insulation in 1000 V DC bus systems |
| Common-Mode Transient Immunity | 200 kV/µs - prevents false triggering in fast-switching SiC/GaN inverters |
| Propagation Delay | ≤60 ns max - supports >1 MHz switching frequencies with tight timing control |
| Peak Output Current | 4.0 A - directly drives gates of 1000 V/100 A IGBTs or 650 V/50 A SiC MOSFETs |
| Supply Voltage Ranges | VDDI: 2.5–5.5 V; VDD: 4.2–30 V - interfaces with 3.3 V/5 V controllers and wide-range gate supplies |
| Output Configuration | Separate VO+ (pull-high) and VO− (pull-low) - enables independent slew rate tuning via external RC networks |
| Operating Temperature | –40 °C to +125 °C - qualified for industrial and automotive under-hood environments |
Pinout & Package
SI8271ABD-AS uses an 8-pin SOIC package with creepage/clearance optimized for reinforced isolation. Pin functions are validated per Skyworks' Si8271 Pin Descriptions (Table 1, DS 206327E).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VI) | Digital control input | TTL-compatible signal with >400 mV hysteresis - immune to noise on controller-to-driver traces |
| 2 (VDDI) | Input-side power supply | 2.5–5.5 V rail powering logic and isolation transmitter - requires local 0.1 µF + 1 µF decoupling |
| 3 (GNDI) | Input-side ground reference | Must be separated from driver-side ground by ≥8 mm creepage for 2.5 kVRMS compliance |
| 4 (EN) | Enable control | Active-high; forces VO+ and VO− low when deasserted - used for system-level fault shutdown |
| 5 (GND) | Driver-side ground | Reference for VO+ and VO− outputs - connects to gate driver return path, not power ground |
| 6 (VO−) | Gate pull-down output | Actively sinks current to discharge MOSFET/IGBT gates - ROL = 1.0 Ω typical enables <100 ns turn-off |
| 7 (VO+) | Gate pull-up output | Actively sources current to charge gates - ROH = 2.7 Ω typical supports fast turn-on of high-Qg devices |
| 8 (VDD) | Driver-side power supply | 4.2–30 V rail powering output stage - must be locally decoupled with low-ESR capacitor near pins 5/6/7/8 |
Key Features
| Feature | Design Value |
|---|---|
| RF-based silicon isolation | Eliminates LED aging and CTR drift - ensures stable timing over 15+ years in solar inverters |
| Dedicated EN pin | Hardware-level shutdown with <100 ns response - critical for overcurrent protection in traction inverters |
| Separate VO+/VO− outputs | Enables independent gate resistor placement - allows asymmetric rise/fall times for EMI optimization |
| 200 ps p-p jitter | Minimizes timing uncertainty in multi-phase interleaved PFC - preserves phase alignment at 200 kHz+ |
| AEC-Q100 qualified | Validated for automotive applications including onboard chargers and battery management systems |
Applications
| Solar Power Inverter | Motor Control Drive |
|---|---|
Use Scenario: Driving high-side IGBTs in NPC three-level inverters with 1200 V DC link voltage. IC Role / Device Role / Timing Role: Isolated gate driver providing level-shifted, noise-immune control signals across 2.5 kVRMS barrier. Use Value: 200 kV/µs CMTI prevents false turn-on during 10 kV/µs bus transients; 4 A peak current enables <200 ns gate drive for 1700 V IGBTs. |
Use Scenario: Controlling SiC MOSFETs in servo amplifier half-bridges operating at 100 kHz switching frequency. IC Role / Device Role / Timing Role: Single-channel isolated driver delivering matched propagation delay (<60 ns) and low jitter (200 ps p-p) for precise PWM timing. Use Value: Separate VO+/VO− outputs allow independent gate resistor tuning to balance EMI and switching losses without compromising dv/dt immunity. |
| Onboard Charger (OBC) | Uninterruptible Power Supply (UPS) |
Use Scenario: Driving GaN HEMTs in bidirectional AC/DC and DC/DC stages of 11 kW EV OBCs. IC Role / Device Role / Timing Role: High-speed isolated gate driver interfacing 3.3 V microcontroller PWM to 650 V GaN power stage. Use Value: 2.5–5.5 V VDDI range matches MCU I/O voltage; 4.2–30 V VDD supports GaN gate drive at 12 V while maintaining 200 kV/µs CMTI. |
Use Scenario: Gate driving IGBT modules in double-conversion UPS inverters with 400 V AC output and 800 V DC bus. IC Role / Device Role / Timing Role: Robust isolated driver ensuring reliable turn-on/turn-off under grid fault conditions with high common-mode noise. Use Value: UVLO monitoring on both VDDI and VDD rails prevents erratic gate behavior during brownouts; AEC-Q100 qualification supports extended field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8271AD-IS | Same Si8271 core, but in 8-pin SOIC-1 wide (5.3 mm body) vs. SI8271ABD-AS (SOIC-8 narrow, 3.9 mm body); identical specs and pinout. | Requires PCB layout revision due to wider package footprint; no electrical or functional change. | Select SI8271ABD-AS for space-constrained designs; choose Si8271AD-IS only if board real estate allows wider SOIC. |
| UCC5350MCDWVR | Texas Instruments part with 3.75 kVRMS isolation (VDE), 10 A peak output, but higher 80 ns propagation delay and no separate VO+/VO− outputs. | Better suited for high-current, lower-frequency IGBTs; lacks independent slew control needed for SiC/GaN EMI tuning. | Prefer SI8271ABD-AS where 4 A output suffices and independent gate control is required; use UCC5350MCDWVR only when >5 A drive or VDE certification is mandatory. |
Compared with Si8271AD-IS, SI8271ABD-AS offers identical performance in a narrower SOIC package for denser layouts; versus UCC5350MCDWVR, it trades peak current for lower propagation delay, independent slew control, and superior CMTI - making it optimal for high-frequency SiC/GaN systems demanding precise timing and EMI control.
Availability
SI8271ABD-AS is available at Aetrix Electronics and suitable for solar power inverters, motor control drives, and onboard chargers requiring stable component supply across long production lifecycles and automotive-grade reliability.
Supply support for SI8271ABD-AS 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, isolation, and precision timing technologies.
The Si827x product line was engineered specifically for high-reliability isolated gate driving in power conversion systems - targeting solar, EV, industrial motor, and UPS applications where optocoupler limitations in speed, lifetime, and CMTI are unacceptable.
FAQ
What is the maximum recommended dV/dt stress the SI8271ABD-AS can withstand without malfunction?
The SI8271ABD-AS is rated for 200 kV/µs common-mode transient immunity (CMTI) per Skyworks datasheet DS206327E. This specification is measured under standard test conditions (VDD = 15 V, load = 1 nF, dV/dt pulse amplitude = 1000 V) and guarantees no false output transitions. The device also supports 400 kV/µs latch-up immunity, meaning it will not suffer permanent damage even under extreme transient stress. These values are validated across the full –40 °C to +125 °C temperature range.
Does the SI8271ABD-AS require external pull-up or pull-down resistors on VO+ or VO− outputs?
No, the SI8271ABD-AS does not require external pull-up or pull-down resistors on VO+ or VO−. Both outputs are actively driven: VO+ sources up to 4 A peak current, and VO− sinks up to 4 A peak current. External resistors are optional and used only for slew rate control - for example, a 10 Ω resistor in series with VO+ limits di/dt during turn-on, while a 5 Ω resistor on VO− adjusts turn-off speed. The internal RDS(ON) values (ROH = 2.7 Ω, ROL = 1.0 Ω) ensure sufficient drive strength without external biasing.
What happens to the outputs of the SI8271ABD-AS during input supply (VDDI) undervoltage lockout?
When VDDI falls below its UVLO threshold (VDDIUV– = 2.1 V typ), the SI8271ABD-AS places both VO+ and VO− into a high-impedance (Hi-Z) state - not a forced low. This is explicitly defined in Table 5 (Si8271 Truth Table) of the datasheet: "VI = L/H, VDDI Unpowered → VO+ = Hi-Z, VO− = L". However, if VDD remains powered while VDDI is unpowered, VO− defaults to low and VO+ remains Hi-Z. This behavior prevents unintended gate charging during controller power loss while allowing safe discharge paths.
Can the SI8271ABD-AS drive both SiC MOSFETs and IGBTs effectively?
Yes, the SI8271ABD-AS is validated for both SiC MOSFETs and IGBTs. Its 4 A peak output current, low RDS(ON) (1.0 Ω pull-down, 2.7 Ω pull-up), and 60 ns propagation delay meet the gate drive requirements of 650 V/100 A SiC devices (e.g., C3M0065090D) and 1200 V/100 A IGBTs (e.g., IKW40N120H3). Skyworks' application note AN1339 confirms thermal performance up to 100 kHz switching with Qg loads up to 200 nC - covering the full range of modern power semiconductors.
Is the SI8271ABD-AS pin-compatible with other Si827x variants like the Si8273 or Si8274?
No, the SI8271ABD-AS is not pin-compatible with Si8273 or Si8274. It uses an 8-pin SOIC package with VI/VDDI/GNDI/EN/GND/VO−/VO+/VDD pinout, whereas Si8273 and Si8274 use 16-pin SOIC or LGA-13 packages with dual inputs (VIA/VIB or PWM/DT) and dual outputs (VOA/VOB). Attempting to substitute SI8271ABD-AS into a Si8273 layout would result in unconnected pins and missing functionality. Only Si8271-series variants (e.g., SI8271AD-IS, SI8271BD-IS) share identical pinout and footprint.
SI8271ABD-AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- SI827x
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
SI8271ABD-AS FAQ
1.How can I place an order for SI8271ABD-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8271ABD-AS 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 SI8271ABD-AS reliable?
The price and inventory of SI8271ABD-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8271ABD-AS is usually 5 days.
3.What payment methods are accepted for SI8271ABD-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8271ABD-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8271ABD-AS?
SI8271ABD-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8271ABD-AS 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 SI8271ABD-AS?
For technical support, including SI8271ABD-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8271ABD-AS requirements.
6.How does Aetrix verify that SI8271ABD-AS is sourced from the original manufacturer or authorized distributors?
All SI8271ABD-AS 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 SI8271ABD-AS meets industry standards.
7.What is the process for return or replacement of SI8271ABD-AS?
All SI8271ABD-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8271ABD-AS, 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 SI8271ABD-AS part is unused and in its original packaging.
Return procedure for SI8271ABD-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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