H11A4VM Equivalent & Substitute Parts

Part Overview

The H11A4VM is an optoisolator transistor with base output manufactured by onsemi, designed for high-voltage isolation applications. This component features a 7500Vpk isolation rating and is housed in a 6-DIP package. The H11A4VM is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain compatibility across isolation voltage, output configuration, package type, and thermal operating range to ensure functional equivalence in circuit applications.

Substiute Parts

H11A4VM

onsemiIn Stock: 12381H11A4VM Datasheet

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H11A1VM

onsemiIn Stock: 12367H11A1VM Datasheet

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H11A4X

Isocom Components 2004 LTDIn Stock: 762H11A4X Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the H11A4VM are identified based on the following critical parameters that determine functional equivalence:

• Package Compatibility: All substitutes must use 6-DIP (0.300", 7.62mm) through-hole mounting to ensure direct PCB compatibility
• Output Configuration: All substitutes must feature transistor with base output to maintain circuit interface requirements
• Single Channel: All substitutes must be single-channel devices
• Isolation Voltage: Substitutes must meet or exceed the isolation voltage requirement; lower isolation ratings are acceptable only if application requirements permit
• Output Voltage Rating: All substitutes must support 30V maximum output voltage
• Saturation Voltage: All substitutes must maintain 400mV maximum Vce saturation
• Operating Temperature Range: Substitutes must cover the required thermal operating window

The H11A4VM has two identified substitutes: H11A1VM (onsemi) and H11A4X (Isocom Components 2004 LTD). Both maintain the same package, output type, channel count, and output voltage specifications. Differences exist in isolation voltage rating and current transfer ratio, which determine their suitability for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

H11A1VM (onsemi) is an active product with ROHS3 compliance, offering the highest current transfer ratio at 50% @ 10mA. However, its isolation voltage of 4170Vrms is significantly lower than the H11A4VM specification of 7500Vpk. This substitute is suitable only for applications where the lower isolation voltage meets design requirements. The identical operating temperature range (-40°C ~ 100°C) and output specifications ensure mechanical and electrical compatibility.

H11A4X (Isocom Components 2004 LTD) is an active product with ROHS3 compliance and an extended operating temperature range (-55°C ~ 100°C). Its isolation voltage of 5300Vrms is lower than the H11A4VM but higher than the H11A1VM, providing a middle-ground option. The H11A4X specifies 50mA output current capability and maintains the same current transfer ratio (10% @ 10mA) as the original part. This substitute is suitable for applications requiring moderate isolation voltage with extended low-temperature operation.

Both substitutes maintain the same 6-DIP package, single-channel configuration, transistor with base output, and 30V maximum output voltage as the H11A4VM. Selection between substitutes depends on isolation voltage requirements and compliance certifications needed for the target application.

Frequently Asked Questions (FAQ)

Q: Can H11A1VM directly replace H11A4VM in all applications?

A: H11A1VM maintains identical package, output type, and output voltage specifications. However, its isolation voltage of 4170Vrms is lower than H11A4VM's 7500Vpk. Direct replacement is possible only if the application does not require the higher isolation voltage. The higher current transfer ratio (50% vs. 10%) may also affect circuit performance.

Q: What is the difference between isolation voltage specifications (Vpk vs. Vrms)?

A: Vpk (peak voltage) and Vrms (root mean square voltage) are different measurement standards for isolation voltage. Direct comparison requires understanding the specific application's voltage waveform and regulatory requirements. H11A4VM specifies 7500Vpk, while H11A1VM and H11A4X specify values in Vrms.

Q: Is the H11A4X suitable for low-temperature applications?

A: Yes. H11A4X operates from -55°C to 100°C, extending the lower temperature limit by 15°C compared to H11A4VM (-40°C to 100°C). This makes H11A4X suitable for applications requiring enhanced cold-temperature performance.

Q: Are both substitutes RoHS compliant?

A: Yes. Both H11A1VM and H11A4X are ROHS3 compliant. The H11A4VM does not specify RoHS status. Both substitutes are REACH unaffected, matching the original part's compliance profile.

Q: Does the 6-DIP package ensure pin-for-pin compatibility?

A: The 6-DIP package ensures mechanical compatibility and identical PCB footprint. However, pin-for-pin electrical compatibility depends on the specific pin assignments and circuit requirements. Verify pinout diagrams for the selected substitute against the original design schematic.

Q: What is the significance of current transfer ratio differences?

A: Current transfer ratio determines the efficiency of signal transfer from input to output. H11A1VM's 50% ratio is higher than H11A4VM and H11A4X at 10%, meaning H11A1VM requires less input current to achieve the same output response. This affects input circuit design and power consumption.