H11G1 Optoisolator Equivalent & Substitute Parts

Part Overview

The H11G1 is an optoisolator with Darlington output and base connection, manufactured by onsemi. This component provides 5300Vrms isolation in a 6-DIP package and is classified as obsolete. Due to its obsolete status, identifying functionally equivalent substitute parts is necessary for ongoing design support, production continuity, and component sourcing.

Key Parameters

Parameter	Value
Manufacturer Part Number	H11G1
Manufacturer	onsemi
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	1000% @ 10mA
Output Type	Darlington with Base
Voltage - Output (Max)	100V
Voltage - Forward (Vf) (Typ)	1.3V
Current - DC Forward (If) (Max)	60 mA
Vce Saturation (Max)	1V
Operating Temperature	-55°C ~ 100°C
Package / Case	6-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the H11G1 is determined by the following critical parameters:

Isolation Voltage: Minimum 5300Vrms or equivalent
Output Configuration: Darlington with Base output type
Current Transfer Ratio: Minimum 1000% @ 10mA
Package Type: 6-DIP (0.300", 7.62mm) for mechanical compatibility
Mounting: Through Hole
Input Type: DC

The substitute parts identified below meet these core electrical and mechanical requirements. Variations in secondary parameters such as maximum output voltage, operating temperature range, and product status are noted but do not preclude substitution when the primary criteria are satisfied.

Parameter Comparison

Parameter	H11G1	H11G1M	H11G2	LTV-725V
Manufacturer	onsemi	onsemi	onsemi	Lite-On Inc.
Voltage - Isolation	5300Vrms	4170Vrms	5300Vrms	5000Vrms
Current Transfer Ratio (Min)	1000% @ 10mA	1000% @ 10mA	1000% @ 10mA	1000% @ 1mA
Output Type	Darlington with Base	Darlington with Base	Darlington with Base	Darlington with Base
Voltage - Output (Max)	100V	100V	80V	300V
Voltage - Forward (Vf) (Typ)	1.3V	1.3V	1.3V	1.2V
Current - DC Forward (If) (Max)	60 mA	60 mA	60 mA	50 mA
Vce Saturation (Max)	1V	1V	1V	1.2V
Operating Temperature	-55°C ~ 100°C	-40°C ~ 100°C	-55°C ~ 100°C	-25°C ~ 100°C
Package / Case	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Obsolete	Active

Engineering Selection Recommendations

H11G1M (onsemi): This part is the active-status equivalent within the onsemi H11G series. It maintains identical electrical characteristics for current transfer ratio, output type, and forward voltage. The isolation voltage is reduced to 4170Vrms, which represents a trade-off acceptable only in applications where the full 5300Vrms isolation is not required. Operating temperature range is narrower (-40°C to 100°C versus -55°C to 100°C). RoHS3 compliance and active product status make this the preferred choice for new designs requiring onsemi components.

H11G2 (onsemi): This part matches the H11G1 in isolation voltage (5300Vrms) and operating temperature range (-55°C to 100°C). The maximum output voltage is reduced to 80V compared to 100V on the H11G1. Product status is obsolete, limiting its suitability for long-term sourcing.

LTV-725V (Lite-On Inc.): This part provides 5000Vrms isolation with superior output voltage capability (300V maximum). Current transfer ratio performance is enhanced (1000% minimum at 1mA versus 10mA for onsemi parts). RoHS3 compliance and active product status support production continuity. The narrower operating temperature range (-25°C to 100°C) and slightly higher Vce saturation (1.2V) require verification against application requirements.

Frequently Asked Questions (FAQ)

Q: Can H11G1M be used as a direct replacement for H11G1?

A: H11G1M is electrically compatible for most applications. The primary difference is reduced isolation voltage (4170Vrms versus 5300Vrms). Substitution is valid only if your circuit design does not require the full 5300Vrms isolation specification. The narrower operating temperature range (-40°C to 100°C) must also be verified against your application environment.

Q: What is the key difference between H11G1 and H11G2?

A: Both parts provide 5300Vrms isolation and identical current transfer ratios. H11G2 has a lower maximum output voltage (80V versus 100V). Both are obsolete, making neither ideal for new production. If isolation voltage and temperature range are critical, H11G2 is functionally equivalent but offers no sourcing advantage.

Q: Why would I choose LTV-725V over onsemi alternatives?

A: LTV-725V offers active product status and RoHS3 compliance, ensuring long-term availability. It provides superior maximum output voltage (300V) and enhanced current transfer ratio performance at lower input current (1mA). These advantages are offset by a narrower operating temperature range (-25°C to 100°C) and slightly higher saturation voltage (1.2V). Selection depends on whether your application requires the extended temperature range or higher output voltage capability.

Q: Are all substitute parts pin-compatible with H11G1?

A: All listed substitutes use the 6-DIP (0.300", 7.62mm) package with Through Hole mounting. Pin compatibility for Darlington with Base output configuration is maintained across all parts. Physical board layout and footprint compatibility are assured. Verify pinout documentation for your specific application circuit.

Q: What compliance certifications apply to these parts?

A: H11G1M and LTV-725V are RoHS3 compliant and REACH unaffected. H11G1 and H11G2 are REACH unaffected but do not carry RoHS3 certification. All parts are classified as EAR99 for export control purposes and use HTSUS code 8541.49.8000.

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