IL 712-3B Equivalent & Substitute Parts Reference

Part Overview

The IL 712-3B is a General Purpose Digital Isolator manufactured by NVE Corp/Isolation Products, featuring 2500Vrms isolation voltage, 2 channels, and 110Mbps data rate in an 8-SOIC package. This component utilizes GMR (Giant Magnetoresistive) technology for signal isolation in applications requiring high common mode transient immunity and galvanic isolation.

The IL 712-3B is classified as Obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this isolator topology.

Substiute Parts

IL 712-3B

NVE Corp/Isolation ProductsIn Stock: 979IL 712-3B Datasheet

Current PartRFQ

HCPL-0931

Broadcom LimitedIn Stock: 116850HCPL-0931 Datasheet

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HCPL-0931-000E

Broadcom LimitedIn Stock: 23915HCPL-0931-000E Datasheet

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HCPL-9031-300

Broadcom LimitedIn Stock: 936HCPL-9031-300 Datasheet

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HCPL-9031-300E

Broadcom LimitedIn Stock: 1209HCPL-9031-300E Datasheet

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HCPL-9031-500E

Broadcom LimitedIn Stock: 772HCPL-9031-500E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the IL 712-3B are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Electrical Compatibility Criteria:

• Isolation voltage: 2500Vrms (exact match required)
• Number of channels: 2 (exact match required)
• Channel configuration: 1/1 unidirectional (exact match required)
• Data rate: 110Mbps or higher (backward compatible)
• Propagation delay: 15ns maximum (exact match required)
• Pulse width distortion: 3ns maximum (exact match required)
• Operating temperature range: -55°C to 125°C (exact match required)
• Supply voltage: 3V to 5.5V compatible range

Mechanical Compatibility Criteria:

• Mounting type: Surface Mount (exact match required)
• Package footprint: 8-pin SOIC or 8-pin SMD configuration (pin-compatible)

Compliance Considerations:

• RoHS compliance status (non-compliant vs. compliant variants available)
• Product status (Active vs. Obsolete)

The substitute parts listed below meet all electrical and mechanical compatibility requirements with the IL 712-3B while offering improved availability and, in certain variants, enhanced regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

HCPL-0931 and HCPL-0931-000E (8-SOIC Package)

These Broadcom Limited parts maintain the 8-SOIC (0.154", 3.90mm Width) package footprint, providing direct mechanical compatibility with IL 712-3B PCB layouts. Both parts are Active status products with significantly higher inventory availability (116,771 and 23,847 units respectively).

HCPL-0931-000E offers ROHS3 compliance, making it suitable for applications subject to RoHS3 regulatory requirements. HCPL-0931 remains RoHS non-compliant, matching the original IL 712-3B compliance profile.

HCPL-9031-300, HCPL-9031-300E, and HCPL-9031-500E (8-SMD, Gull Wing Package)

These variants employ an 8-SMD Gull Wing package configuration, requiring PCB layout modification compared to the original 8-SOIC footprint. All three maintain electrical compatibility with the IL 712-3B specification.

HCPL-9031-300E and HCPL-9031-500E provide ROHS3 compliance. HCPL-9031-500E is supplied in Tape & Reel (TR) packaging, suitable for high-volume automated assembly processes.

Common Mode Transient Immunity Consideration

All substitute parts specify 15kV/µs CMTI, which is lower than the IL 712-3B specification of 100kV/µs. Applications requiring the higher CMTI performance of the original part must evaluate whether the reduced CMTI of substitute parts remains acceptable for the intended circuit environment.

Product Status and Supply Chain

The IL 712-3B is Obsolete. All substitute parts are Active status, ensuring long-term availability and continued manufacturing support from Broadcom Limited.

Frequently Asked Questions (FAQ)

Q: Can HCPL-0931 and HCPL-0931-000E be used as direct replacements for IL 712-3B in existing PCB designs?

A: Yes. Both parts maintain the 8-SOIC (0.154", 3.90mm Width) package footprint and pin configuration, enabling direct PCB substitution without layout modification. Electrical parameters including isolation voltage, channel count, data rate, propagation delay, and operating temperature range are compatible.

Q: What is the difference between HCPL-0931 and HCPL-0931-000E?

A: Both parts are electrically and mechanically identical. The primary difference is RoHS compliance status: HCPL-0931 is RoHS non-compliant, while HCPL-0931-000E is ROHS3 compliant. Selection depends on regulatory requirements for the end application.

Q: Can HCPL-9031-300, HCPL-9031-300E, or HCPL-9031-500E be used as direct PCB replacements?

A: No. These parts use an 8-SMD Gull Wing package configuration, which differs from the IL 712-3B 8-SOIC package. PCB layout and footprint modification is required. However, electrical functionality and pin assignments are compatible.

Q: What is the significance of the lower Common Mode Transient Immunity (15kV/µs vs. 100kV/µs)?

A: The IL 712-3B specifies 100kV/µs CMTI, while all Broadcom substitute parts specify 15kV/µs. CMTI determines the isolator's ability to maintain signal integrity during rapid voltage transitions on the isolated side. Applications operating in high-noise environments with steep dV/dt transients must evaluate whether 15kV/µs CMTI is sufficient for the circuit requirements.

Q: Which substitute part offers the best regulatory compliance?

A: HCPL-0931-000E, HCPL-9031-300E, and HCPL-9031-500E all provide ROHS3 compliance. Selection among these three depends on package requirements (8-SOIC vs. 8-SMD Gull Wing) and packaging format (Tube vs. Tape & Reel).

Q: What packaging options are available for high-volume production?

A: HCPL-9031-500E is supplied in Tape & Reel (TR) format, optimized for automated pick-and-place assembly. HCPL-0931, HCPL-0931-000E, HCPL-9031-300, and HCPL-9031-300E are supplied in Tube packaging.

Q: Are all substitute parts available in sufficient inventory?

A: Yes. All substitute parts show substantial inventory availability: HCPL-0931 (116,771 units), HCPL-0931-000E (23,847 units), HCPL-9031-300 (882 units), HCPL-9031-300E (1,111 units), and HCPL-9031-500E (666 units). The IL 712-3B original part has 964 units in stock.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts operate across -55°C to 125°C, matching the IL 712-3B specification. Supply voltage range is 3V to 5.5V for all parts.