H11G3TM Optoisolator Equivalent & Substitute Parts

Part Overview

The H11G3TM is an optoisolator with Darlington output and base connection, manufactured by onsemi. This component provides 7500Vpk isolation voltage in a 6-DIP package and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute parts maintain functional compatibility through matching package type, output configuration, isolation voltage range, and electrical operating parameters.

Key Parameters

Parameter	H11G3TM
Manufacturer	onsemi
Package / Case	6-DIP (0.400", 10.16mm)
Number of Channels	1
Output Type	Darlington with Base
Voltage - Isolation	7500Vpk
Current Transfer Ratio (Min)	200% @ 1mA
Voltage - Output (Max)	55V
Vce Saturation (Max)	1.2V
Operating Temperature	-40°C ~ 100°C
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the H11G3TM are selected based on the following criteria:

Package Compatibility: All substitutes use 6-DIP through-hole mounting to ensure direct board-level replacement without layout modifications.

Output Configuration: All substitutes feature Darlington output with base connection, maintaining identical circuit interface requirements.

Isolation Voltage: Substitutes operate at isolation voltages of 4170Vrms to 5000Vrms, which are within acceptable ranges for applications designed for the H11G3TM's 7500Vpk isolation specification.

Input Type: All substitutes accept DC input, matching the H11G3TM input requirement.

Current Transfer Ratio: Substitute parts range from 50% to 1000% @ specified test currents, providing flexibility for different circuit gain requirements.

Operating Temperature Range: Substitutes maintain -40°C to 100°C or -55°C to 100°C ranges, covering or exceeding the H11G3TM specification.

Product Status: Active substitutes ensure long-term availability and supply chain continuity compared to the obsolete H11G3TM.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR (Min)	Voltage Output (Max)	Vce Sat (Max)	Temp Range	Product Status	Package
H11G3TM	onsemi	7500Vpk	200% @ 1mA	55V	1.2V	-40°C ~ 100°C	Obsolete	6-DIP (0.400")
H11G2TVM	onsemi	4170Vrms	1000% @ 10mA	80V	1V	-40°C ~ 100°C	Active	6-DIP (0.400")
4N29M-V	Everlight Electronics	5000Vrms	100% @ 10mA	55V	1V	-55°C ~ 100°C	Active	6-DIP (0.400")
4N30M-V	Everlight Electronics	5000Vrms	100% @ 10mA	55V	1V	-55°C ~ 100°C	Active	6-DIP (0.400")
4N31M	Everlight Electronics	5000Vrms	50% @ 10mA	55V	1.2V	-55°C ~ 100°C	Active	6-DIP (0.400")
4N31M-V	Everlight Electronics	5000Vrms	50% @ 10mA	55V	1.2V	-55°C ~ 100°C	Active	6-DIP (0.400")
4N32M	onsemi	4170Vrms	500% @ 10mA	30V	1V	-40°C ~ 100°C	Active	6-DIP (0.300")
4N32M-V	Everlight Electronics	5000Vrms	500% @ 10mA	55V	1V	-55°C ~ 100°C	Active	6-DIP (0.400")
4N33M-V	Everlight Electronics	5000Vrms	500% @ 10mA	55V	1V	-55°C ~ 100°C	Active	6-DIP (0.400")
H11B1M-V	Everlight Electronics	5000Vrms	500% @ 1mA	55V	1V	-55°C ~ 100°C	Active	6-DIP (0.400")
H11B255M	Everlight Electronics	5000Vrms	100% @ 10mA	55V	1V	-55°C ~ 100°C	Active	6-DIP (0.400")

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

H11G2TVM and 4N32M-V are the most direct replacements. Both maintain the 6-DIP (0.400") package footprint and support the full 55V output voltage range. H11G2TVM is onsemi-manufactured, ensuring continuity with the original supplier. 4N32M-V provides equivalent isolation voltage at 5000Vrms with active product status and RoHS3 compliance.

Secondary Substitutes (Functional Equivalents):

4N29M-V, 4N30M-V, 4N31M, 4N31M-V, 4N33M-V, H11B1M-V, and H11B255M all provide 5000Vrms isolation in the standard 6-DIP (0.400") package. These parts are active products with RoHS3 compliance. Selection among these depends on current transfer ratio requirements: parts with 500% CTR (4N32M-V, 4N33M-V, H11B1M-V) offer higher gain, while 100% CTR parts (4N29M-V, 4N30M-V, H11B255M) and 50% CTR parts (4N31M, 4N31M-V) provide lower gain options.

Not Recommended:

4N32M uses a 6-DIP (0.300") package, which differs from the H11G3TM's 0.400" pitch and may require PCB layout modifications.

Compliance Considerations:

All active substitutes carry RoHS3 compliance or ROHS3 Compliant status, supporting modern manufacturing and environmental requirements. The H11G3TM's obsolete status necessitates transition to active alternatives for new production.

Frequently Asked Questions (FAQ)

Q: Can I directly replace H11G3TM with H11G2TVM on existing PCBs?

A: Yes. Both parts use identical 6-DIP (0.400", 10.16mm) package dimensions and pin configurations. No PCB modifications are required. H11G2TVM is an onsemi product, maintaining supplier continuity.

Q: What is the difference between 4170Vrms and 5000Vrms isolation voltage?

A: Both exceed typical industrial isolation requirements. The H11G3TM specifies 7500Vpk (approximately 5303Vrms), so 5000Vrms substitutes meet or approach this specification. 4170Vrms substitutes provide lower isolation but remain suitable for most applications designed for the H11G3TM.

Q: How do current transfer ratio differences affect circuit operation?

A: Current transfer ratio (CTR) determines the output current relative to input current. Higher CTR (500-1000%) requires less input current for the same output. Lower CTR (50-100%) requires proportionally more input current. Circuit design must account for these differences through input current adjustment.

Q: Why is 4N32M not recommended despite being onsemi?

A: The 4N32M uses a 6-DIP (0.300") package, which has different pin spacing than the H11G3TM's 6-DIP (0.400") package. This physical difference requires PCB layout changes and is not a direct drop-in replacement.

Q: Are all substitute parts RoHS compliant?

A: Active substitutes carry RoHS3 compliance or equivalent status. The H11G3TM is obsolete and does not carry current RoHS certification. Transition to active substitutes ensures compliance with modern environmental and manufacturing standards.

Q: Can I use Everlight parts as replacements for onsemi originals?

A: Yes. Everlight Electronics Co Ltd parts (4N29M-V, 4N30M-V, 4N31M, 4N31M-V, 4N32M-V, 4N33M-V, H11B1M-V, H11B255M) are functionally equivalent and meet the same electrical and package specifications. All are active products with established supply chains.

Q: What temperature range should I select?

A: The H11G3TM operates -40°C to 100°C. Most substitutes extend this to -55°C to 100°C, providing additional low-temperature margin. Select based on your application's actual operating environment.

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