4N30 Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N30 is an optoisolator with Darlington output and base connection, manufactured by onsemi. It provides 5300Vrms isolation voltage in a 6-DIP through-hole package. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	4N30
Manufacturer	onsemi
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	100% @ 10mA
Output Type	Darlington with Base
Voltage - Output (Max)	30V
Current - Output / Channel	150mA
Operating Temperature	-55°C ~ 100°C
Package / Case	6-DIP (0.300", 7.62mm)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 4N30 is determined by the following critical parameters:

Isolation Voltage: Minimum 5000Vrms to maintain equivalent isolation performance
Output Configuration: Darlington with Base output type
Package Type: 6-DIP through-hole mounting
Number of Channels: Single channel
Input Type: DC input
Operating Temperature Range: Support for -55°C to 100°C or compatible subset
Current Transfer Ratio: Minimum 100% @ 10mA

The substitute parts 4N30M, 4N45, and 4N46 meet these core substitution criteria with variations in isolation voltage, output voltage rating, and current transfer ratio specifications.

Parameter Comparison

Parameter	4N30 (Main)	4N30M	4N45	4N46
Manufacturer	onsemi	Fairchild Semiconductor	Broadcom Limited	Broadcom Limited
Product Status	Obsolete	Active	Active	Active
Number of Channels	1	1	1	1
Voltage - Isolation	5300Vrms	5000Vrms	3750Vrms	3750Vrms
Current Transfer Ratio (Min)	100% @ 10mA	100% @ 10mA	200% @ 10mA	200% @ 10mA
Current Transfer Ratio (Max)	—	—	1000% @ 10mA	1000% @ 10mA
Output Type	Darlington with Base	Darlington with Base	Darlington with Base	Darlington with Base
Voltage - Output (Max)	30V	55V	7V	20V
Current - Output / Channel	150mA	—	60mA	60mA
Voltage - Forward (Vf) (Typ)	1.2V	1.2V	1.4V	1.4V
Current - DC Forward (If) (Max)	80mA	60mA	20mA	20mA
Vce Saturation (Max)	1V	1V	—	—
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	6-DIP (0.300", 7.62mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	—	—	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

4N30M (Fairchild Semiconductor): Active product status with 5000Vrms isolation voltage, meeting the minimum isolation requirement. Operating temperature range matches the original specification. Package dimensions differ (0.400" vs 0.300"), requiring PCB layout verification. Suitable for applications where isolation voltage tolerance allows 300Vrms reduction.

4N45 (Broadcom Limited): Active product with 3750Vrms isolation voltage, representing a 1550Vrms reduction from the original specification. Higher current transfer ratio (200–1000% @ 10mA) and lower maximum output voltage (7V) and current (60mA) limit applicability. Operating temperature range is narrower (-40°C to 85°C). Suitable only for applications with lower isolation voltage requirements and reduced output current demands.

4N46 (Broadcom Limited): Active product with 3750Vrms isolation voltage and 20V maximum output voltage. Current transfer ratio and forward current specifications match 4N45. Operating temperature range is narrower than the original. Suitable for applications tolerating reduced isolation voltage with moderate output voltage requirements.

Frequently Asked Questions (FAQ)

Q: Can the 4N30M directly replace the 4N30 on existing PCBs?

A: The 4N30M maintains electrical compatibility for isolation voltage, current transfer ratio, and operating temperature. However, the package dimension difference (0.400" vs 0.300" DIP width) requires PCB layout verification. Pin spacing remains standard 6-DIP, but board footprint may require adjustment.

Q: What is the minimum isolation voltage acceptable for 4N30 substitution?

A: The 4N30 specifies 5300Vrms isolation. The 4N30M at 5000Vrms meets the minimum threshold for equivalent isolation performance. The 4N45 and 4N46 at 3750Vrms represent a significant reduction and are suitable only for applications with lower isolation voltage requirements.

Q: Are 4N45 and 4N46 suitable for high-current applications?

A: No. Both devices limit output current to 60mA maximum, compared to the 4N30's 150mA rating. Applications requiring the full 150mA output current must use the 4N30 or 4N30M.

Q: What is the difference between 4N45 and 4N46?

A: Both share identical isolation voltage (3750Vrms), current transfer ratio (200–1000%), and forward current specifications. The primary difference is maximum output voltage: 4N45 is rated 7V, while 4N46 is rated 20V. Selection depends on output voltage requirements.

Q: Do the Broadcom 4N45 and 4N46 support the full operating temperature range of the 4N30?

A: No. The 4N30 operates from -55°C to 100°C, while 4N45 and 4N46 operate from -40°C to 85°C. Applications requiring operation below -40°C or above 85°C cannot use these substitutes.

Q: What compliance certifications apply to these optoisolators?

A: All parts carry REACH Unaffected status and EAR99 export classification. The 4N45 and 4N46 are RoHS non-compliant, while compliance status for 4N30 and 4N30M is not specified in the provided data.

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