SI8281CD-IS Equivalent & Substitute Parts

Part Overview

The SI8281CD-IS is a digital isolated gate driver manufactured by Skyworks Solutions Inc., designed for high-voltage switching applications requiring galvanic isolation. This 1-channel capacitive coupling gate driver operates at 5000Vrms isolation voltage with 4A peak output current capability. The device is currently in active production status. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design flexibility, or application-specific voltage supply requirements.

Substiute Parts

SI8281CD-IS

Skyworks Solutions Inc.In Stock: 1156SI8281CD-IS Datasheet

Current PartRFQ

SI8281CC-IS

Skyworks Solutions Inc.In Stock: 1158SI8281CC-IS Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The SI8281CC-IS qualifies as a direct substitute for the SI8281CD-IS based on the following critical parameters that determine functional equivalence:

Matching Parameters (Substitution Basis):

• Isolation voltage: 5000Vrms
• Number of channels: 1
• Technology: Capacitive Coupling
• Common Mode Transient Immunity: 35kV/µs (Min)
• Propagation delay: 50ns / 50ns (Max)
• Pulse width distortion: 5ns (Max)
• Rise / Fall time: 5.5ns / 8.5ns (Typ)
• Output current: 2.5A / 3A (High / Low), 4A (Peak)
• Operating temperature: -40°C ~ 125°C
• Package: 20-SOIC (0.295", 7.50mm Width)
• Mounting type: Surface Mount
• Moisture Sensitivity Level: 3 (168 Hours)

Differing Parameter:

• Voltage - Output Supply: SI8281CD-IS operates at 12V ~ 30V, while SI8281CC-IS operates at 2.8V ~ 5.5V

The SI8281CC-IS is suitable as a substitute when the application circuit operates within the 2.8V ~ 5.5V supply voltage range. The SI8281CD-IS must be retained when supply voltage exceeds 5.5V.

Parameter Comparison

Engineering Selection Recommendations

SI8281CD-IS Selection Criteria:

• Required when output supply voltage range is 12V ~ 30V
• Applications requiring higher supply voltage operation
• Active product status with established supply chain

SI8281CC-IS Selection Criteria:

• Suitable when output supply voltage operates within 2.8V ~ 5.5V range
• Automotive-grade qualification (AEC-Q100) available
• Active product status with established supply chain
• RoHS3 compliant

Both devices maintain identical electrical performance characteristics for isolation, propagation delay, output current, and thermal operating range. Selection between these parts is determined solely by the application's output supply voltage requirement. The SI8281CC-IS includes automotive qualification, which may be relevant for automotive applications operating within its specified voltage range.

Frequently Asked Questions (FAQ)

Q: Can SI8281CC-IS replace SI8281CD-IS in all applications?

A: No. The SI8281CC-IS operates at 2.8V ~ 5.5V output supply voltage, while the SI8281CD-IS operates at 12V ~ 30V. Substitution is only valid when the application circuit operates within the 2.8V ~ 5.5V range. If your design requires supply voltages above 5.5V, the SI8281CD-IS must be used.

Q: Are the isolation voltage and switching performance identical between these parts?

A: Yes. Both devices provide 5000Vrms isolation voltage, 35kV/µs common mode transient immunity, 50ns propagation delay, and 4A peak output current. All timing and current specifications are identical.

Q: Do these parts use the same package?

A: Yes. Both SI8281CD-IS and SI8281CC-IS use the 20-SOIC package with 0.295" width (7.50mm). They are pin-compatible and require no PCB layout modifications.

Q: What is the difference in product qualifications?

A: The SI8281CC-IS carries AEC-Q100 automotive qualification and RoHS3 compliance. The SI8281CD-IS product status is listed as active. Selection should be based on application requirements and supply voltage constraints rather than qualification differences.

Q: Are there any thermal or operating temperature differences?

A: No. Both devices operate across the identical temperature range of -40°C ~ 125°C with the same moisture sensitivity level (MSL 3, 168 hours).