H11B3S Optoisolator Equivalent & Substitute Parts

Part Overview

The H11B3S is an optoisolator with Darlington output and base connection, manufactured by onsemi. This component provides 5300Vrms isolation in a 6-SMD surface mount package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. Substitute parts must maintain functional compatibility across isolation voltage, output configuration, and thermal operating range.

Key Parameters

Parameter	H11B3S
Manufacturer	onsemi
Product Status	Obsolete
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	100% @ 1mA
Output Type	Darlington with Base
Voltage - Output (Max)	25V
Vce Saturation (Max)	1V
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 eligibility for the H11B3S is determined by the following critical parameters:

Output Configuration: All substitutes must provide Darlington output with base connection
Package Type: All substitutes must use 6-SMD, Gull Wing surface mount package
Isolation Voltage: Substitutes must meet or exceed the isolation voltage requirement of 5300Vrms
Operating Temperature Range: Substitutes must support the full operating range or be compatible with the application's thermal requirements
Current Transfer Ratio: Substitutes must maintain minimum 100% CTR at specified input current
Vce Saturation: Substitutes must not exceed 1V maximum saturation voltage

Based on these criteria, the H11B3S has three qualified substitute parts: H11B3SM, H11B3SMT&R (both from Isocom Components 2004 LTD), and H11B1SM (from onsemi). The 4N30SM from Fairchild Semiconductor does not meet the isolation voltage requirement and is listed for reference only.

Parameter Comparison

Parameter	H11B3S (Main)	H11B3SM	H11B3SMT&R	H11B1SM	4N30SM
Manufacturer	onsemi	Isocom Components 2004 LTD	Isocom Components 2004 LTD	onsemi	Fairchild Semiconductor
Product Status	Obsolete	Active	Active	Active	Active
Number of Channels	1	1	1	1	1
Voltage - Isolation	5300Vrms	7.5Vpk	7.5Vpk	4170Vrms	4170Vrms
Current Transfer Ratio (Min)	100% @ 1mA	100% @ 1mA	100% @ 1mA	500% @ 1mA	100% @ 10mA
Output Type	Darlington with Base	Darlington with Base	Darlington with Base	Darlington with Base	Darlington with Base
Voltage - Output (Max)	25V	30V	30V	30V	30V
Current - Output / Channel	-	-	-	150mA	150mA
Voltage - Forward (Vf) (Typ)	1.35V	1.2V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	100mA	80mA	80mA	80mA	80mA
Vce Saturation (Max)	1V	1V	1V	1V	1V
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing
Packaging Type	-	Tube	Tape & Reel (TR)	Tube	Bulk
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	-

Engineering Selection Recommendations

Primary Substitutes (Recommended)

H11B3SM and H11B3SMT&R from Isocom Components 2004 LTD are the primary substitutes for the H11B3S. Both parts are active products with ROHS3 compliance and REACH Unaffected status. The isolation voltage specification differs in units (7.5Vpk versus 5300Vrms), but both maintain the required Darlington output configuration, 6-SMD package, and full operating temperature range of -55°C to 100°C. H11B3SM is supplied in tube packaging, while H11B3SMT&R is supplied in tape and reel format for automated assembly.

Secondary Substitute (Limited Compatibility)

H11B1SM from onsemi is an active product with ROHS3 compliance suitable for applications where the lower isolation voltage of 4170Vrms is acceptable. This part offers superior current transfer ratio (500% @ 1mA) and specified output current capability (150mA), but operates only to -40°C minimum temperature. Use H11B1SM only when the application's thermal requirements do not extend below -40°C.

Not Recommended

4N30SM from Fairchild Semiconductor does not meet the isolation voltage requirement (4170Vrms versus 5300Vrms) and is not suitable as a substitute for the H11B3S.

Frequently Asked Questions (FAQ)

Q: Can H11B3SM or H11B3SMT&R directly replace H11B3S in existing designs?

A: Yes. Both parts maintain identical package configuration (6-SMD, Gull Wing), output type (Darlington with base), and operating temperature range (-55°C to 100°C). The primary difference is isolation voltage specification format. Electrical performance is compatible for applications designed for the H11B3S.

Q: What is the difference between H11B3SM and H11B3SMT&R?

A: Both parts are identical in electrical and mechanical specifications. The difference is packaging format: H11B3SM is supplied in tube packaging for manual handling, while H11B3SMT&R is supplied in tape and reel format for automated pick-and-place assembly.

Q: Can H11B1SM be used as a substitute?

A: H11B1SM is compatible only for applications where the operating temperature range does not extend below -40°C. The isolation voltage is lower (4170Vrms), but the part provides higher current transfer ratio and specified output current capability. Verify thermal requirements before selection.

Q: What compliance certifications apply to substitute parts?

A: H11B3SM and H11B3SMT&R are ROHS3 compliant and REACH Unaffected. H11B1SM is also ROHS3 compliant and REACH Unaffected. All parts carry EAR99 ECCN classification and HTSUS code 8541.49.8000.

Q: Are there inventory considerations for substitute selection?

A: H11B3SM has 12,400 units in stock, H11B3SMT&R has 737 units in stock, and H11B1SM has 12,200 units in stock. Availability may influence selection for high-volume production requirements.

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