H11A3TM Equivalent & Substitute Parts

Part Overview

The H11A3TM is an optoisolator transistor with base output manufactured by onsemi, rated for 7500Vpk isolation voltage in a 6-DIP through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The H11A3TM provides galvanic isolation with transistor output capability suitable for signal coupling and switching applications requiring high voltage isolation.

Key Parameters

Parameter	Value
Manufacturer Part Number	H11A3TM
Manufacturer	onsemi
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	7500Vpk
Current Transfer Ratio (Min)	20% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	30V
Vce Saturation (Max)	400mV
Operating Temperature	-40°C ~ 100°C
Mounting Type	Through Hole
Package / Case	6-DIP (0.400", 10.16mm)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the H11A3TM is determined by the following critical parameters:

Isolation Voltage: 7500Vpk minimum requirement
Output Configuration: Transistor with base output
Number of Channels: Single channel
Package Type: 6-DIP through-hole mounting
Current Transfer Ratio: Minimum 20% @ 10mA
Vce Saturation: Maximum 400mV
Input Type: DC

Substitute parts are grouped into two categories:

Category 1 - Direct Package Equivalents (Through-Hole 6-DIP): Parts maintaining identical mounting type and package dimensions, suitable for direct PCB replacement without layout modification.

Category 2 - Functional Equivalents (Alternative Packages): Parts meeting electrical specifications but with different mounting technology (surface mount), requiring PCB redesign for implementation.

Parameter Comparison

Parameter	H11A3TM (Main)	H11A3G	H11A3M	H11A4M	H11A5M	H11A2M
Manufacturer	onsemi	Isocom Components 2004 LTD	Fairchild Semiconductor	onsemi	Fairchild Semiconductor	onsemi
Voltage - Isolation	7500Vpk	7.5Vpk	5000Vrms	7500Vpk	5000Vrms	7500Vpk
Current Transfer Ratio (Min)	20% @ 10mA	20% @ 10mA	20% @ 10mA	10% @ 10mA	30% @ 10mA	20% @ 10mA
Turn On / Turn Off Time (Typ)	2µs, 2µs	—	3µs, 3µs	2µs, 2µs	3µs, 3µs	2µs, 2µs
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	30V	30V	80V	30V	80V	30V
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV	400mV
Operating Temperature	-40°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 110°C	-40°C ~ 100°C	-55°C ~ 110°C	-40°C ~ 100°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Surface Mount
Package / Case	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.400", 10.16mm)	6-SMD, Gull Wing
Product Status	Obsolete	Active	Obsolete	Obsolete	Obsolete	Obsolete

Engineering Selection Recommendations

H11A3G (Isocom Components 2004 LTD) - Recommended primary substitute for direct replacement. Maintains identical package dimensions (6-DIP 0.400"), through-hole mounting, and meets all electrical specifications. Product status is active, ensuring long-term availability. Operating temperature range extends to -55°C, providing broader environmental coverage than the main part.

H11A3M (Fairchild Semiconductor) - Functional equivalent with through-hole 6-DIP package compatibility. Isolation voltage specified as 5000Vrms (lower than 7500Vpk main part). Output voltage capability increased to 80V. Product status is obsolete. Suitable only where isolation voltage requirement can be reduced to 5000Vrms.

H11A4M (onsemi) - Through-hole 6-DIP package with reduced pitch (0.300" vs 0.400"). Maintains 7500Vpk isolation voltage but specifies lower minimum current transfer ratio (10% vs 20%). Package dimension difference requires PCB layout verification for footprint compatibility.

H11A5M (Fairchild Semiconductor) - Through-hole 6-DIP package with 5000Vrms isolation voltage and higher current transfer ratio (30% @ 10mA). Output voltage capability increased to 80V. Product status is obsolete. Suitable where reduced isolation voltage and enhanced current transfer are acceptable.

H11A2M (onsemi) - Surface mount 6-SMD package with 7500Vpk isolation voltage and matching electrical specifications. Requires PCB redesign for surface mount implementation. Not suitable for direct through-hole replacement without circuit board modification.

Frequently Asked Questions (FAQ)

Q: Can H11A3G replace H11A3TM directly on the PCB?

A: Yes. H11A3G maintains identical 6-DIP (0.400", 10.16mm) through-hole package dimensions and meets all electrical specifications. No PCB layout modification is required. H11A3G is currently in active production status.

Q: What is the key difference between H11A3M and H11A3TM?

A: H11A3M specifies 5000Vrms isolation voltage compared to H11A3TM's 7500Vpk. Both use through-hole 6-DIP packages with identical dimensions. H11A3M also provides higher maximum output voltage (80V vs 30V). Substitution is valid only if the application can operate with reduced isolation voltage.

Q: Why is H11A2M listed as a substitute if it uses surface mount packaging?

A: H11A2M is a functional equivalent meeting all electrical specifications with 7500Vpk isolation voltage. However, the 6-SMD surface mount package requires PCB redesign and cannot be used as a direct replacement in through-hole applications without circuit board modification.

Q: Does H11A4M have different package dimensions than H11A3TM?

A: Yes. H11A4M uses 6-DIP (0.300", 7.62mm) package with reduced pitch compared to H11A3TM's 6-DIP (0.400", 10.16mm). PCB footprint compatibility must be verified before substitution. Additionally, H11A4M specifies minimum 10% current transfer ratio versus 20% for H11A3TM.

Q: Which substitute offers the widest operating temperature range?

A: H11A3M and H11A5M both specify -55°C ~ 110°C operating temperature range, extending beyond H11A3TM's -40°C ~ 100°C. Both are Fairchild Semiconductor products with obsolete status.

Q: Are all substitutes RoHS compliant?

A: H11A3G is explicitly marked ROHS3 Compliant. H11A3M and H11A5M are marked ROHS3 Compliant. H11A3TM, H11A4M, and H11A2M do not specify RoHS status in provided documentation. Verify compliance requirements with your procurement specifications.

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