Silicon Labs SI8274AB4D-IM1R Isolated Gate Driver — 2.5 kVrms, 4 A, 14‑LGA
Overview
The Silicon Labs SI8274AB4D-IM1R is a member of the Si827x isolated gate driver family designed for robust, high-performance power conversion. Delivering up to 4 A peak source/sink drive capability with basic isolation rated around 2.5 kVrms, this dual-channel driver targets motor drives, inverters, and switched‑mode power supplies (SMPS). The device comes in a compact 14‑lead LGA (IM1) package and is supplied in tape‑and‑reel (R) for automated assembly.
Engineers selecting the SI8274AB4D-IM1R benefit from a pragmatic blend of isolation and drive strength in a footprint optimized for dense power stages. The dual-channel architecture is well-suited for half-bridge or dual low-side configurations, helping simplify layout while supporting fast, reliable switching of power transistors. The part’s active lifecycle status and RoHS compliance further support long-term sourcing confidence and environmental stewardship.
Key option-specific behaviors (such as input logic conventions and UVLO thresholds) are defined by the AB4D option code; Silicon Labs documents these details in the Si827x datasheet and product selector. Where exact numeric parameters are not specified below, refer to the official documentation to confirm values for your design.
At a Glance
- MPN: SI8274AB4D-IM1R
- Brand / Manufacturer: Silicon Labs (Silicon Laboratories Inc.)
- Family / Series: Si827x isolated gate drivers
- Function: Dual isolated gate driver
- Isolation rating: 2.5 kVrms (basic)
- Peak output current: 4 A (source/sink)
- Package: 14‑LGA (IM1), 4 × 4 mm
- Mounting: Surface mount
- Packaging: Tape & Reel (R)
- Pin count: 14
- Lifecycle status: Active
- Environmental: RoHS Compliant
- Typical applications: Motor drives, inverters, SMPS, power conversion
Why SI8274AB4D-IM1R Stands Out
Practical isolation for modern power stages
The SI8274AB4D-IM1R provides basic isolation rated around 2.5 kVrms, a practical level for many inverter and SMPS topologies where functional isolation and noise immunity are essential. This isolation helps break ground loops, mitigates common-mode transients between control and power domains, and supports safer, more robust operation across demanding environments.
4 A peak drive to switch faster and cleaner
With up to 4 A peak source/sink capability, the SI8274AB4D-IM1R can rapidly charge and discharge gate capacitances of power MOSFETs or IGBTs, supporting efficient transitions and minimizing time spent in linear regions. For engineers working to reduce switching losses or meet higher-frequency operation targets, stronger gate drive translates into improved efficiency margins and thermal headroom.
Dual-channel convenience in a compact LGA
Two driver channels in the 4 × 4 mm IM1 LGA package offer a tight, surface‑mount solution that helps shorten gate loop inductance and simplify routing. Whether you’re implementing a synchronous buck, a half‑bridge stage, or two independent low-side switches, the dual‑channel configuration can often reduce total component count and PCB area.
Specifications
Note: Option-specific parameters (e.g., input logic type, UVLO thresholds, and certain timing characteristics) depend on the AB4D option. Refer to the Silicon Labs Si827x datasheet for definitive values.
- Device variant: SI8274AB4D-IM1R
- Family: Si827x isolated gate drivers
- Channels: 2 (dual isolated gate driver)
- Isolation rating: 2.5 kVrms (basic)
- Peak output current: 4 A
- Package: 14‑LGA (IM1), 4 × 4 mm
- Pin count: 14
- Mounting type: Surface Mount
- Packaging: Tape & Reel (R)
- Lifecycle status: Active
- RoHS status: RoHS Compliant
- Additional electrical/timing parameters: Not specified in datasheet excerpt here; consult the Si827x datasheet
Applications and Use Cases
Motor drives
From small BLDC controllers to industrial AC drives, the SI8274AB4D-IM1R’s isolated dual channels and 4 A drive capability make it a fit for high‑side/low‑side stages and isolated low‑side drivers. The isolation barrier helps maintain signal integrity across noisy motor environments.
Inverters and DC‑AC conversion
In photovoltaic string inverters, UPS systems, or general DC‑AC conversion, isolation between control logic and the power stage is critical. The SI8274AB4D-IM1R supports reliable switching in these topologies, enabling designers to balance efficiency and EMI performance.
Switched‑mode power supplies (SMPS)
SMPS designs often demand compact gate drivers with strong transient immunity, fast edges, and dependable isolation. The SI8274AB4D-IM1R’s 4 A peak drive supports rapid transitions of MOSFET gates, assisting in achieving high efficiency with manageable thermal profiles.
General power conversion
Whenever the control microcontroller must be galvanically isolated from high‑voltage power devices, an isolated gate driver like the SI8274AB4D-IM1R is a natural choice. Typical areas include server power, industrial automation, and test equipment.
Design Considerations
Sizing gate drive strength
The 4 A peak drive current is useful for rapidly charging/discharging gate capacitance. Right‑sizing the external gate resistors lets you balance switching speed with manageable overshoot/ringing and EMI. Heavier gates may require lower series resistance to fully leverage the available peak current.
Isolation planning
A basic isolation rating of around 2.5 kVrms is appropriate for many applications; verify that creepage/clearance, insulation type, and system‑level agency requirements align with your end equipment. If your application mandates reinforced isolation or higher working voltages, confirm suitability using the Si827x datasheet and safety certifications applicable to your market.
Option code verification
The AB4D option code determines important behaviors such as input logic mode and undervoltage lockout (UVLO) levels. Confirm these details in the Si827x datasheet before finalizing schematics, especially if you’re migrating from a different option within the family.
Layout guidance
Keep gate loops short and tightly coupled to minimize inductance. Place the SI8274AB4D-IM1R close to the power switches it drives, and provide a solid return path for high di/dt currents. Decouple each supply pin with low‑ESR capacitors placed as close as possible to the device pins, as recommended in the datasheet.
Package and Handling
Package details
- Package style: 14‑LGA (IM1)
- Body size: 4 × 4 mm
- Mounting: Surface mount
- Delivery format: Tape & Reel (IM1R code)
This compact LGA helps conserve PCB area in dense power stages. Observe recommended land patterns and assembly guidelines from Silicon Labs to ensure solder joint integrity and reliable manufacturing yields.
Lifecycle, Availability, and Sourcing
- Lifecycle status: Active (per Silicon Labs product family information)
- Inventory quantity (this listing): 0 units currently
- Approved alternates: None listed in provided data
- Replacements: None specified
For production planning, check authorized distributors and the Silicon Labs product page for current lead times and stocking status. If you require a pin‑compatible or functionally similar alternative, use the Si827x family selector on the Silicon Labs site to compare options; verify isolation class, channel configuration, and option-code specifics before substitution.
Compliance and Environmental
- RoHS: RoHS Compliant
- Other environmental/safety certifications: Not specified in datasheet excerpt here
Always validate compliance requirements for your target region and end equipment. If your certification flow demands documentation, consult the latest Silicon Labs environmental compliance statements and safety reports for the Si827x family.
Ordering Information
- Full MPN: SI8274AB4D-IM1R
- Family: Si827x isolated gate drivers
- Package code: IM1 = 14‑LGA (4 × 4 mm)
- Packaging code: R = Tape & Reel
- Option code note: AB4D defines input logic and UVLO behaviors. Confirm exact characteristics in the Si827x datasheet.
If your build requires a different logic interface or UVLO level, review adjacent Si827x variants and option codes. Maintain a single, approved MPN in procurement systems to avoid accidental mixing of similar but non‑identical options.
Specifications Summary (Concise)
- Isolation rating: 2.5 kVrms (basic)
- Peak output current: 4 A
- Channels: 2 (dual isolated gate driver)
- Package: 14‑LGA (IM1), 4 × 4 mm
- Mounting: Surface mount
- Pin count: 14
- Lifecycle: Active
- RoHS: Compliant
- Additional electrical specifications: Not specified in datasheet excerpt here
Resources
- Product page: https://www.silabs.com/isolation/isolated-gate-drivers/si827x
- Datasheet: https://www.silabs.com/documents/public/data-sheets/si827x-datasheet.pdf
Refer to the datasheet for comprehensive electrical characteristics, timing parameters, isolation test methods, and layout guidelines.
Frequently Asked Questions (FAQs)
What is the SI8274AB4D-IM1R?
It is a Silicon Labs Si827x family dual isolated gate driver providing basic isolation around 2.5 kVrms and up to 4 A peak source/sink drive, packaged in a compact 14‑LGA (IM1) format and supplied in tape‑and‑reel.
How many channels does it have?
Two driver channels, suitable for half‑bridge, synchronous rectification, or dual low‑side configurations.
What isolation rating does it provide?
Basic isolation rated around 2.5 kVrms, per the Si827x family information. For exact working voltage and test methodology, consult the datasheet.
What is the peak output current?
Up to 4 A (source/sink), enabling fast switching of power transistor gates.
Which package does SI8274AB4D-IM1R use?
A 14‑lead LGA (IM1) package measuring approximately 4 × 4 mm.
Is the device RoHS compliant?
Yes, it is listed as RoHS Compliant.
What is the lifecycle status?
Active, according to Silicon Labs product family information provided.
Are there direct replacements or approved alternates?
No replacements or alternates are specified in the provided data. Use the Si827x selector to evaluate nearby options and confirm equivalence before substitution.
Where can I find detailed electrical specifications (e.g., UVLO, propagation delay, input logic)?
These are option‑dependent and not included in this summary. Refer to the Si827x datasheet for AB4D‑specific parameters and design guidance.
Final Takeaway
The Silicon Labs SI8274AB4D-IM1R is a concise, application‑ready dual isolated gate driver offering 2.5 kVrms basic isolation and 4 A peak drive in a space‑saving 14‑LGA package. For engineers building motor drives, inverters, or SMPS stages, it provides the core attributes needed for efficient, robust switching without unnecessary complexity. Check the Si827x datasheet to confirm AB4D‑specific details such as input logic and UVLO thresholds, and leverage Silicon Labs’ product resources to streamline selection and sourcing for your next power design.