H11B3 Equivalent & Substitute Parts

Part Overview

The H11B3 is an optoisolator with Darlington output and base connection, manufactured by Vishay Semiconductor Opto Division. This component provides 5300Vrms isolation in a 6-DIP package and is designed for applications requiring high-voltage galvanic isolation with Darlington output configuration. The H11B3 is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	H11B3
Manufacturer	Vishay Semiconductor Opto Division
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	100% @ 1mA
Output Type	Darlington with Base
Voltage - Output (Max)	25V
Current - Output / Channel	100mA
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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the H11B3 is determined by the following critical parameters:

Isolation Voltage: Minimum 5000Vrms (H11B3 specifies 5300Vrms)
Output Configuration: Darlington with Base output
Number of Channels: Single channel
Package Type: 6-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Input Type: DC
Operating Temperature Range: -55°C to 100°C minimum
RoHS Compliance: ROHS3 Compliant

The substitute parts identified meet these core electrical and mechanical requirements, enabling direct functional replacement in applications designed for the H11B3.

Parameter Comparison

Parameter	H11B3 (Vishay)	H11B3 (Fairchild)	MCA230 (Isocom)
Voltage - Isolation	5300Vrms	5000Vrms	5300Vrms
Current Transfer Ratio (Min)	100% @ 1mA	100% @ 1mA	100% @ 10mA
Turn On / Turn Off Time (Typ)	5µs, 30µs	25µs, 18µs	10µs, 100µs
Output Type	Darlington with Base	Darlington with Base	Darlington with Base
Voltage - Output (Max)	25V	55V	30V
Voltage - Forward (Vf) (Typ)	1.1V	1.2V	1.2V
Current - DC Forward (If) (Max)	60mA	60mA	60mA
Vce Saturation (Max)	1V	1V	1V
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Package / Case	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Obsolete	Active

Engineering Selection Recommendations

H11B3 (Fairchild Semiconductor): This part maintains identical part numbering and meets core substitution criteria with 5000Vrms isolation. However, it is classified as obsolete, limiting long-term availability. The Fairchild variant exhibits different switching characteristics (25µs turn-on, 18µs turn-off) compared to the original Vishay part, and supports higher maximum output voltage (55V). Selection of this substitute should be based on application tolerance for timing variations and output voltage requirements.

MCA230 (Isocom Components 2004 LTD): This part is classified as active, providing superior long-term availability compared to obsolete alternatives. The MCA230 matches the original 5300Vrms isolation specification and supports 30V maximum output voltage. The Current Transfer Ratio minimum is specified at 100% @ 10mA (versus 1mA for the H11B3), and switching characteristics differ (10µs turn-on, 100µs turn-off). The MCA230 is suitable for applications where extended product lifecycle and availability are priorities.

Both substitute parts maintain ROHS3 compliance, identical package geometry, and compatible operating temperature ranges, enabling direct PCB-level replacement with appropriate circuit validation for timing and voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can the H11B3 (Fairchild) be used as a direct replacement for the H11B3 (Vishay)?

A: Both parts share identical part numbering and core electrical specifications (5000Vrms isolation, Darlington output, 6-DIP package). However, switching time characteristics differ (Fairchild: 25µs turn-on vs. Vishay: 5µs turn-on). Direct substitution is valid only if the application circuit tolerates these timing differences. Maximum output voltage also differs (Fairchild: 55V vs. Vishay: 25V).

Q: What are the key differences between the MCA230 and the original H11B3?

A: The MCA230 provides equivalent 5300Vrms isolation and Darlington output configuration in the same 6-DIP package. Primary differences include: Current Transfer Ratio minimum at 10mA (versus 1mA), maximum output voltage of 30V (versus 25V), and different switching characteristics (10µs turn-on, 100µs turn-off). The MCA230 is classified as active, ensuring ongoing availability.

Q: Are all three parts pin-compatible?

A: All three parts use the 6-DIP (0.300", 7.62mm) package with identical pin configuration for Darlington output optoisolators. Pin-level compatibility is confirmed for Through Hole mounting applications.

Q: Which substitute part should be selected for new designs?

A: The MCA230 (Isocom) is recommended for new designs due to active product status and long-term availability. The H11B3 (Fairchild) may be considered only if existing inventory is available and application requirements align with its specific electrical characteristics.

Q: Do all parts meet RoHS compliance requirements?

A: All three parts are ROHS3 compliant, meeting environmental and regulatory requirements for current manufacturing standards.

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