H11B815 Optoisolator Equivalent & Substitute Parts

Part Overview

The H11B815 is a 5000Vrms isolation Darlington output optoisolator manufactured by onsemi in a 4-DIP through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The H11B815 provides single-channel optical isolation with Darlington output configuration, suitable for applications requiring high-voltage isolation in DC input circuits.

Substiute Parts

H11B815

onsemiIn Stock: 1309H11B815 Datasheet

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EL815

Everlight Electronics Co LtdIn Stock: 1475EL815 Datasheet

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ISP815-1

Isocom Components 2004 LTDIn Stock: 976ISP815-1 Datasheet

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ISP815-2

Isocom Components 2004 LTDIn Stock: 1115ISP815-2 Datasheet

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ISP815-3

Isocom Components 2004 LTDIn Stock: 1024ISP815-3 Datasheet

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LTV-815

Lite-On Inc.In Stock: 45282LTV-815 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the H11B815 are qualified based on the following critical parameters:

Mandatory Matching Parameters:

• Package / Case: 4-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• Number of Channels: 1
• Output Type: Darlington
• Input Type: DC
• Voltage - Isolation: 5000Vrms minimum
• Vce Saturation (Max): 1V

Compatible Parameter Ranges:

• Current Transfer Ratio (Min): 600% @ 1mA or higher
• Voltage - Output (Max): 35V or higher
• Current - Output / Channel: 80mA or higher
• Operating Temperature: Must encompass -55°C to 100°C or provide adequate coverage for intended application

Substitute parts meeting these criteria maintain functional and electrical compatibility with H11B815 applications while accommodating active product availability and compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: LTV-815 (Lite-On Inc.)

The LTV-815 provides the closest electrical and thermal specification match to the H11B815. Both components specify 5000Vrms isolation voltage, 600% minimum current transfer ratio, 35V maximum output voltage, and 80mA output current. The LTV-815 extends the upper operating temperature to 110°C compared to the H11B815's 100°C maximum. The LTV-815 is ROHS3 compliant and maintains active product status with substantial inventory availability (45,200 pcs).

Secondary Substitutes: EL815 (Everlight Electronics Co Ltd)

The EL815 matches the H11B815 across all critical electrical parameters: 5000Vrms isolation, 600-7500% current transfer ratio range, 35V output voltage, and 80mA output current. The EL815 provides extended upper operating temperature to 110°C. ROHS3 compliance and active product status support long-term availability. Inventory levels (1,390 pcs) support production requirements.

Alternative Substitutes: ISP815-1, ISP815-2, ISP815-3 (Isocom Components 2004 LTD)

The ISP815 series (variants 1, 2, and 3) provide enhanced isolation voltage at 5300Vrms and higher minimum current transfer ratio at 800% @ 1mA. These components specify 70V maximum output voltage, exceeding the H11B815's 35V rating. Output current specification is not provided for the ISP815 series. Operating temperature range is -30°C to 100°C, which does not extend to the H11B815's -55°C minimum. The ISP815 series is suitable for applications where lower temperature operation below -30°C is not required and higher output voltage capability is beneficial. All three variants are ROHS3 compliant with active product status.

Frequently Asked Questions (FAQ)

Q: Can the LTV-815 directly replace the H11B815 in existing designs?

A: Yes. The LTV-815 maintains identical package, pinout, and critical electrical specifications (5000Vrms isolation, 600% minimum CTR, 35V output, 80mA output current, 1V Vce saturation). The extended upper operating temperature (110°C vs. 100°C) provides additional thermal margin. No circuit modifications are required.

Q: What is the difference between the ISP815-1, ISP815-2, and ISP815-3?

A: The three ISP815 variants are electrically identical in the provided specifications. All three specify 5300Vrms isolation voltage, 800% minimum current transfer ratio, 70V maximum output voltage, and 1V Vce saturation. Selection between variants may depend on availability, packaging options (Tube), or manufacturer lot requirements. Consult Isocom datasheets for any undocumented variant differences.

Q: Why do the ISP815 series specify higher output voltage (70V) than the H11B815 (35V)?

A: The ISP815 series is designed for applications requiring higher output voltage capability. In circuits designed for the H11B815's 35V maximum output, the ISP815's 70V rating provides additional design margin and compatibility with higher-voltage load circuits. The ISP815 remains fully functional in 35V applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts (EL815, ISP815-1, ISP815-2, ISP815-3, LTV-815) are ROHS3 compliant. The H11B815 (obsolete) does not specify RoHS status.

Q: What is the minimum operating temperature consideration for substitute selection?

A: The H11B815 specifies -55°C to 100°C operating range. The LTV-815 and EL815 support -55°C to 110°C, maintaining full compatibility. The ISP815 series specifies -30°C to 100°C, which does not cover operation below -30°C. For applications requiring -55°C operation, select LTV-815 or EL815.

Q: Can I use ISP815 series in place of H11B815 if my application does not require -55°C operation?

A: Yes, provided your application does not require operation below -30°C. The ISP815 series offers enhanced isolation voltage (5300Vrms vs. 5000Vrms) and higher current transfer ratio (800% minimum vs. 600% minimum), making it suitable for applications within the -30°C to 100°C range.

Q: What inventory considerations should guide substitute selection?

A: The LTV-815 offers the highest inventory availability (45,200 pcs), supporting high-volume production. The ISP815-2 (1,098 pcs), ISP815-3 (977 pcs), and EL815 (1,390 pcs) provide adequate stock for standard production runs. The ISP815-1 (932 pcs) has the lowest inventory among active substitutes.