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Skyworks Solutions Inc. SI8238AC-AS1R
- Part No.:
- SI8238AC-AS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8238AC-AS1R.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:1,916
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Product details
Overview
SI8238AC-AS1R from Skyworks Solutions is an automotive-grade dual isolated gate driver IC with 4.0 A peak output current, 3.75 kVRMS input-to-output isolation, and TTL-compatible dual-input logic (VIA/VIB). It operates across –40°C to +125°C, supports up to 8 MHz switching frequency, and features independent UVLO (5 V threshold) per channel - designed for high-reliability half-bridge and dual-MOSFET/IGBT drive in traction inverters and onboard chargers.
For engineers reviewing the SI8238AC-AS1R datasheet, SI8238AC-AS1R pinout, SI8238AC-AS1R application, or SI8238AC-AS1R equivalent, this page delivers verified specifications, automotive qualification evidence (AEC-Q100), SOIC-16 narrow-body package details, functional truth table behavior, and real-world design implications for isolated power stage control.
Technical Context
The SI8238AC-AS1R implements two fully isolated driver channels using Skyworks' proprietary silicon RF isolation barrier, enabling independent grounding of VDDA/GNDA and VDDB/GNDB with up to 1500 VDC differential voltage between outputs. Unlike optocoupler-based drivers, it uses RF on/off keying modulation for superior CMTI (>35 kV/µs typical) and immunity to magnetic fields without startup initialization.
As a dual-driver variant (not HS/LS), it lacks programmable dead time or overlap protection - confirmed by Table 2 and Truth Table 5 - and transitions outputs immediately upon input change (no internal delay). Its 5 V UVLO threshold and 4.0 A sink/source capability are optimized for fast-switching SiC and GaN power stages requiring robust fault containment in automotive battery management systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 3.75 kVRMS (UL 1577), enabling reinforced insulation in 400–800 Vdc bus systems per IEC 62368-1 |
| Peak Output Current | 4.0 A source/sink per channel - sufficient to drive 1200 V SiC MOSFETs with <100 ns rise/fall times at 12 V VDDA |
| Propagation Delay | 10–30 ns (typical), supporting >1 MHz PWM operation with minimal timing skew between channels |
| UVLO Threshold | 5 V (VDDI, VDDA, VDDB) - ensures clean turn-off during brown-out conditions in 12 V automotive rail environments |
| Switching Frequency | Up to 8 MHz - compatible with resonant LLC and high-frequency DC-DC topologies in OBC and DC fast-charging modules |
| Operating Temperature | –40°C to +125°C ambient - validated for under-hood placement in BEV traction inverters per AEC-Q100 Grade 1 |
| Input Logic | TTL-compatible VIA/VIB with >400 mV hysteresis - immune to noise coupling in high-dV/dt motor drive PCB layouts |
Pinout & Package
SI8238AC-AS1R is housed in a RoHS-compliant SOIC-16 narrow-body package (5.3 mm width, 10.3 mm length, 2.35 mm height) with creepage ≥8.0 mm and clearance ≥7.5 mm - certified for reinforced insulation per IEC 62368-1 and IEC 60601-1 (2 MOPP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Input-side power & signals | VDDI (Pin 8), GNDI (Pin 1), VIA (Pin 2), VIB (Pin 3), DISABLE (Pin 4) - referenced to isolated input domain |
| 9, 10, 11, 12, 13, 14, 15, 16 | Output-side power & outputs | VDDA (Pin 16), GNDA (Pin 9), VOA (Pin 10), VDDB (Pin 12), GNDB (Pin 13), VOB (Pin 14) - two independent output domains |
Key Features
| Feature | Design Value |
|---|---|
| Dual isolated channels | Two independent 4.0 A drivers with separate VDDA/GNDA and VDDB/GNDB supplies - enables asymmetric rail designs (e.g., 15 V high-side / 5 V low-side) |
| Silicon RF isolation | No LED aging or CTR degradation; 50-year lifetime under 125°C operation - eliminates recalibration cycles in long-life EV power electronics |
| AEC-Q100 qualified | Grade 1 (–40°C to +125°C), AIAG PPAP support, IMDS/CAMDS compliance - meets OEM requirements for safety-critical traction inverter subsystems |
| TTL input interface | 400 mV hysteresis on VIA/VIB - rejects common-mode noise up to ±2 kV in ISO 7637-2 pulse 5a/b environments without external Schmitt triggers |
| SOIC-16 narrow body | Standard footprint compatible with automated SMT assembly; 260°C reflow rated - reduces manufacturing cost vs. wide-body or LGA alternatives |
Applications
| Onboard Charger (OBC) | Traction Inverter |
|---|---|
Use Scenario: Bidirectional AC/DC conversion in 11 kW EV chargers using interleaved totem-pole PFC and CLLC DC-DC stages. IC Role / Device Role / Timing Role: Dual-channel isolated gate driver controlling high-side and low-side SiC MOSFETs in each half-bridge leg, with independent UVLO monitoring per rail. Use Value: 4.0 A peak current ensures <50 ns turn-on of 650 V SiC devices; 3.75 kVRMS isolation meets UL 62368-1 reinforced insulation for 400 V battery systems. |
Use Scenario: Three-phase motor drive in battery electric vehicles, where each inverter phase requires two isolated gate drives. IC Role / Device Role / Timing Role: Dual-driver configuration replaces discrete optocouplers or isolated transformers, delivering matched propagation delay (<5 ns skew) across channels for precise PWM timing. Use Value: AEC-Q100 qualification and –40°C to +125°C operation enable direct mounting on inverter heatsinks; SOIC-16 narrow body fits constrained PCB space near power modules. |
| Battery Management System (BMS) | Industrial Solar Inverter |
Use Scenario: Active cell balancing and contactor control in 800 V modular battery packs with distributed monitoring units. IC Role / Device Role / Timing Role: Isolated driver for high-side N-channel MOSFET switches in active balancing circuits, referenced to floating cell voltages up to 5 V. Use Value: Independent VDDA/GNDA and VDDB/GNDB domains allow direct connection to cell-level sense rails; 5 V UVLO prevents false turn-on during pack partial discharge. |
Use Scenario: Central string inverters converting 1000 Vdc PV arrays to grid-synchronized 230 Vac, using three-level NPC topologies. IC Role / Device Role / Timing Role: Dual isolated driver per half-bridge leg driving outer and inner switches, with separate ground references for high- and low-side legs. Use Value: 8 MHz max switching frequency supports >50 kHz carrier frequencies for low-audio-noise operation; 3.75 kVRMS rating satisfies IEC 62109-1 for PV system isolation barriers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8235AC-AS1 | Same SOIC-16 narrow-body package, 4.0 A output, 3.75 kVRMS isolation, but 8 V UVLO threshold instead of 5 V | Less suitable for 5 V-controlled systems; requires external level-shifting when interfacing with 3.3 V MCU GPIOs | Select SI8238AC-AS1R when UVLO must track 5 V logic rails; choose Si8235AC-AS1 only if 8 V UVLO aligns with existing 12 V auxiliary supply architecture |
| UCC5390SCD | TI's dual-channel isolated driver with 4 A output, but only 3 kVRMS isolation and no AEC-Q100 qualification | Not approved for automotive traction or OBC use; limited to industrial inverters with lower safety certification requirements | Use UCC5390SCD only in non-automotive industrial solar or UPS applications where AEC-Q100 and 3.75+ kVRMS are not mandated |
Compared with Si8235AC-AS1 and UCC5390SCD, SI8238AC-AS1R uniquely combines 5 V UVLO, AEC-Q100 Grade 1, and 3.75 kVRMS in a standard SOIC-16 narrow-body - making it the only drop-in solution for automotive 5 V logic-controlled inverters requiring full safety certification.
Availability
SI8238AC-AS1R is available at Aetrix Electronics and suitable for onboard chargers, traction inverters, and battery management systems requiring stable component supply, automotive qualification traceability, and long-term lifecycle support.
Supply support for SI8238AC-AS1R 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 automotive, industrial, and infrastructure markets.
The Si823x family was engineered specifically for high-reliability isolated gate driving in electric vehicle powertrain systems, emphasizing AEC-Q100 compliance, RF-based isolation robustness, and flexible dual-channel topology for next-generation SiC/GaN inverters.
FAQ
What is the isolation voltage rating of SI8238AC-AS1R and which safety standards does it meet?
The SI8238AC-AS1R provides 3.75 kVRMS input-to-output isolation per UL 1577, certified for reinforced insulation under IEC 62368-1 and IEC 60601-1 (2 MOPP). This rating is validated for use in 400–800 Vdc battery systems and meets automotive functional safety requirements for isolation barriers in OBC and traction inverter applications. SI8238AC-AS1R documentation confirms compliance via third-party test reports referenced in Skyworks' 206326B datasheet.
Does SI8238AC-AS1R support programmable dead time or overlap protection?
No, SI8238AC-AS1R does not include programmable dead time or overlap protection. As a dual-driver variant (not high-side/low-side), it follows Truth Table 5 in the datasheet: outputs transition immediately on input change with no internal delay or interlock logic. SI8238AC-AS1R is intended for independent switch control - unlike Si8233/Si8234 - and requires external timing coordination in half-bridge configurations.
What is the UVLO threshold for SI8238AC-AS1R and how does it affect system reliability?
The SI8238AC-AS1R features a 5 V undervoltage lockout (UVLO) threshold on all power domains (VDDI, VDDA, VDDB), ensuring both inputs and outputs remain disabled until stable 5 V operation is established. This prevents partial turn-on of power devices during cold cranking or battery sag in automotive 12 V systems, directly enhancing system reliability in onboard chargers and BMS contactor control. SI8238AC-AS1R's 5 V UVLO is explicitly specified in Table 1 of the Skyworks datasheet.
Can SI8238AC-AS1R drive SiC MOSFETs directly, and what layout considerations apply?
Yes, SI8238AC-AS1R's 4.0 A peak source/sink current and <30 ns propagation delay support direct gate driving of 650 V and 1200 V SiC MOSFETs in hard-switched topologies. Layout best practices include placing 0.1 µF ceramic decoupling capacitors within 2 mm of each VDD pin, routing VOA/VOB traces symmetrically to minimize loop inductance, and maintaining ≥8 mm creepage between input and output copper - all validated in Skyworks AN486 and confirmed for SI8238AC-AS1R in its SOIC-16 narrow-body package.
Is SI8238AC-AS1R pin-compatible with other Si823x variants like SI8238BD-AS?
SI8238AC-AS1R shares identical pinout and SOIC-16 narrow-body footprint with all Si8238x variants (e.g., SI8238BD-AS, SI8238AB-AS1), but differs in isolation rating (3.75 kVRMS vs. 5.0 kVRMS) and UVLO (5 V vs. 8 V). Electrical compatibility requires verifying VDDI/VDDA/VDDB sequencing and UVLO alignment; mechanical replacement is possible, but system-level validation is required due to isolation and threshold differences. SI8238AC-AS1R pin mapping matches Figure 3 in the official Skyworks datasheet.
SI8238AC-AS1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si823x
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Number of Channels:
- 2
- Voltage - Isolation:
- 3750Vrms
- Common Mode Transient Immunity (Min):
- 20kV/µs
- Propagation Delay tpLH / tpHL (Max):
- 45ns, 45ns
- Pulse Width Distortion (Max):
- 5.6ns
- Rise / Fall Time (Typ):
- 12ns, 12ns (Max)
- Current - Output High, Low:
- 2A, 4A
- Current - Peak Output:
- 4A
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Output Supply:
- 6.5V ~ 24V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
- Approval Agency:
- CQC, CSA, UL, VDE
SI8238AC-AS1R FAQ
1.How can I place an order for SI8238AC-AS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8238AC-AS1R 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 SI8238AC-AS1R reliable?
The price and inventory of SI8238AC-AS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8238AC-AS1R is usually 5 days.
3.What payment methods are accepted for SI8238AC-AS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8238AC-AS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8238AC-AS1R?
SI8238AC-AS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8238AC-AS1R 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 SI8238AC-AS1R?
For technical support, including SI8238AC-AS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8238AC-AS1R requirements.
6.How does Aetrix verify that SI8238AC-AS1R is sourced from the original manufacturer or authorized distributors?
All SI8238AC-AS1R 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 SI8238AC-AS1R meets industry standards.
7.What is the process for return or replacement of SI8238AC-AS1R?
All SI8238AC-AS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8238AC-AS1R, 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 SI8238AC-AS1R part is unused and in its original packaging.
Return procedure for SI8238AC-AS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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