H11AA43SD Optoisolator Equivalent & Substitute Parts

Part Overview

The H11AA43SD is an optoisolator transistor with base output manufactured by onsemi, rated for 5300Vrms isolation voltage in a 6-SMD surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The H11AA43SD serves applications requiring AC/DC input optoisolation with transistor output and base connection capability.

Key Parameters

Parameter	H11AA43SD
Manufacturer	onsemi
Product Status	Obsolete
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	100% @ 10mA
Input Type	AC, DC
Output Type	Transistor with Base
Voltage - Output (Max)	30V
Voltage - Forward (Vf) (Typ)	1.2V
Current - DC Forward (If) (Max)	100 mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	6-SMD, Gull Wing
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the H11AA43SD is determined by the following critical parameters:

Isolation Voltage: 5300Vrms (primary electrical requirement)
Current Transfer Ratio: Minimum 100% @ 10mA (functional performance)
Output Type: Transistor with Base (circuit topology requirement)
Package / Case: 6-SMD, Gull Wing (mechanical compatibility)
Input Type: AC, DC (signal compatibility)
Vce Saturation: 400mV maximum (switching performance)

Direct substitutes maintain all critical parameters. Similar substitutes differ in Current Transfer Ratio (20% @ 10mA instead of 100%), which affects circuit gain characteristics but maintains functional compatibility in applications not requiring the higher transfer ratio specification.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Isolation	Current Transfer Ratio (Min)	Voltage - Output (Max)	Current - Output / Channel	Vce Saturation (Max)	Operating Temperature	Packaging
H11AA43SD	onsemi	Obsolete	5300Vrms	100% @ 10mA	30V	—	400mV	-55°C ~ 100°C	Tube
H11AA4XSM	Isocom Components 2004 LTD	Active	5300Vrms	100% @ 10mA	35V	50mA	400mV	-30°C ~ 100°C	Tube
H11AA4XSMT&R	Isocom Components 2004 LTD	Active	5300Vrms	100% @ 10mA	35V	50mA	400mV	-30°C ~ 100°C	Tape & Reel (TR)
H11AA4SM	onsemi	Active	4170Vrms	100% @ 10mA	30V	50mA	400mV	-40°C ~ 100°C	Tube
H11AA4SVM	Fairchild Semiconductor	Active	4170Vrms	100% @ 10mA	30V	50mA	400mV	-40°C ~ 100°C	Bulk
H11AA4SMT&R	Isocom Components 2004 LTD	Active	7.5Vpk	100% @ 10mA	35V	50mA	400mV	-30°C ~ 100°C	Tape & Reel (TR)
H11AA1XSM	Isocom Components 2004 LTD	Active	5300Vrms	20% @ 10mA	35V	50mA	400mV	-30°C ~ 100°C	Tube
H11AA1XSMT&R	Isocom Components 2004 LTD	Active	5300Vrms	20% @ 10mA	35V	50mA	400mV	-30°C ~ 100°C	Tape & Reel (TR)
H11AA1SM	onsemi	Active	4170Vrms	20% @ 10mA	30V	50mA	400mV	-40°C ~ 100°C	Tube
H11AA1SMT&R	Isocom Components 2004 LTD	Active	7.5Vpk	20% @ 10mA	35V	50mA	400mV	-30°C ~ 100°C	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Substitutes (Recommended for H11AA43SD replacement):

H11AA4XSM and H11AA4XSMT&R are the primary direct substitutes, maintaining 5300Vrms isolation voltage and 100% current transfer ratio. Both are manufactured by Isocom Components 2004 LTD with active product status. H11AA4XSM is supplied in tube packaging, while H11AA4XSMT&R is supplied in tape and reel format for automated assembly. Both offer improved output voltage rating (35V vs. 30V) and specified output current (50mA). Operating temperature range is -30°C to 100°C, which is narrower than the original -55°C to 100°C specification.

Alternative Direct Substitutes (Lower isolation voltage):

H11AA4SM (onsemi) and H11AA4SVM (Fairchild Semiconductor) provide 4170Vrms isolation with 100% current transfer ratio. These are suitable only for applications where 4170Vrms isolation meets system requirements. Both maintain active product status and 400mV Vce saturation specification.

Similar Substitutes (Reduced current transfer ratio):

H11AA1XSM, H11AA1XSMT&R, H11AA1SM, and H11AA1SMT&R maintain the same isolation voltage or package compatibility but specify 20% current transfer ratio instead of 100%. These are suitable for applications where lower transfer ratio is acceptable or where circuit design compensates for reduced gain.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and REACH unaffected status where specified.

Frequently Asked Questions (FAQ)

Q: Can H11AA4SM replace H11AA43SD directly?

A: H11AA4SM is electrically compatible for the transistor output stage and maintains 100% current transfer ratio. However, it provides 4170Vrms isolation instead of 5300Vrms. Use H11AA4SM only if your application isolation voltage requirement is 4170Vrms or lower.

Q: What is the difference between H11AA4XSM and H11AA4XSMT&R?

A: Both parts are identical electrically and functionally. H11AA4XSM is supplied in tube packaging for manual handling, while H11AA4XSMT&R is supplied in tape and reel format for automated pick-and-place assembly. Select based on assembly process requirements.

Q: Can I use H11AA1XSM as a substitute?

A: H11AA1XSM maintains 5300Vrms isolation and 6-SMD package compatibility but specifies 20% current transfer ratio instead of 100%. This reduced transfer ratio affects circuit gain. Use H11AA1XSM only if your circuit design accommodates lower current transfer ratio or if application requirements do not mandate 100% minimum transfer ratio.

Q: What is the operating temperature impact of substitution?

A: H11AA43SD operates from -55°C to 100°C. Direct substitutes H11AA4XSM and H11AA4XSMT&R operate from -30°C to 100°C. If your application requires operation below -30°C, verify that the reduced lower temperature limit is acceptable for your system.

Q: Are all substitutes RoHS compliant?

A: All active substitute parts listed are ROHS3 compliant where RoHS status is specified. The original H11AA43SD does not specify RoHS status due to obsolete classification.

Q: What packaging options are available for substitutes?

A: Substitutes are available in tube packaging (standard for manual assembly), tape and reel packaging (for automated assembly), and bulk packaging. Select packaging based on your production assembly method and volume requirements.

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