4N30SD Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N30SD is an optoisolator with Darlington output and base connection, manufactured by onsemi. This component provides 5300Vrms isolation voltage in a 6-SMD surface mount package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and component sourcing. Substitute parts must maintain functional compatibility across isolation voltage, output configuration, channel count, and thermal operating range.

Substiute Parts

4N30SD

onsemiIn Stock: 49274N30SD Datasheet

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4N30SR2M

onsemiIn Stock: 28244N30SR2M Datasheet

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4N30SM

Fairchild SemiconductorIn Stock: 222494N30SM Datasheet

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4N30SMT&R

Isocom Components 2004 LTDIn Stock: 9534N30SMT&R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 4N30SD is determined by the following critical parameters:

• Number of Channels: Must be 1 channel
• Output Type: Must be Darlington with Base configuration
• Package / Case: Must be 6-SMD, Gull Wing surface mount
• Voltage - Output (Max): Must support 30V maximum
• Vce Saturation (Max): Must not exceed 1V
• Mounting Type: Must be Surface Mount

The substitute parts listed below maintain these core electrical and mechanical specifications. Variations in isolation voltage, current transfer ratio, and operating temperature range are permitted within the allowed parameter set for this product category, provided all critical parameters remain compatible.

Parameter Comparison

Engineering Selection Recommendations

4N30SR2M (onsemi): Active product status with Tape & Reel packaging. Maintains all critical electrical parameters including 1V Vce saturation and 150mA output current. Isolation voltage is reduced to 4170Vrms compared to the 4N30SD. Operating temperature range is -40°C ~ 100°C, which is narrower at the lower end. RoHS3 compliant.

4N30SM (Fairchild Semiconductor): Active product status with Bulk packaging. Electrical specifications match 4N30SR2M. Isolation voltage is 4170Vrms. Operating temperature range is -40°C ~ 100°C. Largest inventory availability among substitutes.

4N30SMT&R (Isocom Components 2004 LTD): Active product status with Tape & Reel packaging. Maintains operating temperature range of -55°C ~ 100°C, matching the original 4N30SD. Output current is reduced to 10mA, which is a significant limitation compared to the 4N30SD specification of 150mA. Isolation voltage specification differs (7.5Vpk). RoHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can 4N30SR2M replace 4N30SD in all applications? A: 4N30SR2M maintains critical electrical parameters (Darlington output, 1V Vce saturation, 150mA output current, 30V maximum output voltage, 6-SMD package). The reduced isolation voltage (4170Vrms vs. 5300Vrms) and narrower operating temperature range (-40°C to 100°C vs. -55°C to 100°C) must be evaluated against application requirements.

Q: What is the primary limitation of 4N30SMT&R as a substitute? A: The 4N30SMT&R has a maximum output current of 10mA, compared to 150mA for the 4N30SD. This significantly reduces available output drive capability and may not be suitable for applications requiring higher current switching.

Q: Are all substitute parts available in the same packaging format? A: No. 4N30SR2M and 4N30SMT&R are supplied in Tape & Reel (TR) format, while 4N30SM is supplied in Bulk packaging. Component procurement and assembly processes must account for these packaging differences.

Q: Do the substitute parts maintain the same thermal operating range? A: 4N30SR2M and 4N30SM operate from -40°C to 100°C, which is narrower than the 4N30SD range of -55°C to 100°C. 4N30SMT&R maintains the full -55°C to 100°C range. Applications requiring operation below -40°C must use 4N30SMT&R, subject to current output limitations.

Q: What compliance certifications apply to these substitute parts? A: 4N30SR2M is RoHS3 compliant. 4N30SMT&R is RoHS3 compliant. All parts are REACH Unaffected and classified as EAR99 for export control purposes.