4N30S Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N30S 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 part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional compatibility across isolation voltage, output configuration, channel count, and thermal operating range.

Substiute Parts

4N30S

onsemiIn Stock: 9504N30S Datasheet

Current PartRFQ

4N30SM

Fairchild SemiconductorIn Stock: 222494N30SM Datasheet

SimilarRFQ

4N30SM

Fairchild SemiconductorIn Stock: 222494N30SM Datasheet

SimilarRFQ

4N30SMT&R

Isocom Components 2004 LTDIn Stock: 9534N30SMT&R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 4N30S is determined by the following critical parameters:

• Output Configuration: Darlington with Base output type
• Channel Count: Single channel (1)
• Package Type: 6-SMD, Gull Wing surface mount
• Isolation Voltage: Minimum 4170Vrms (allows for lower isolation ratings in specific applications)
• Output Voltage Rating: 30V maximum
• Output Current: 150mA per channel
• Current Transfer Ratio: 100% @ 10mA minimum
• Switching Times: 5µs turn-on, 40µs maximum turn-off
• Operating Temperature Range: -40°C to 100°C minimum (4N30S operates -55°C to 100°C)

The 4N30SM and 4N30SMT&R meet the core functional requirements for Darlington output optoisolators in 6-SMD packaging. However, critical differences exist in isolation voltage rating and output current capability that must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

4N30SM (Fairchild Semiconductor): This part is active and maintains electrical compatibility with the 4N30S across output configuration, switching times, and output voltage/current ratings. The isolation voltage is rated at 4170Vrms, which is lower than the 4N30S specification of 5300Vrms. The operating temperature range is -40°C to 100°C, which does not extend to the -55°C minimum of the original part. Selection of this substitute is appropriate for applications where the reduced isolation voltage and narrower temperature range are acceptable.

4N30SMT&R (Isocom Components 2004 LTD): This part is active and available in Tape & Reel packaging with ROHS3 compliance. The output current rating is 10mA, significantly lower than the 4N30S specification of 150mA. The isolation voltage specification of 7.5Vpk is substantially different from the 4N30S. This part is suitable only for applications with reduced output current requirements and where the isolation voltage specification aligns with design requirements. The operating temperature range matches the original part at -55°C to 100°C.

Both substitute parts maintain the Darlington with Base output configuration, single-channel architecture, and 6-SMD Gull Wing package format. Selection must be based on specific application requirements for isolation voltage, output current, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the 4N30SM directly replace the 4N30S in all applications?

A: The 4N30SM maintains functional compatibility in output configuration, switching characteristics, and output voltage/current ratings. However, the isolation voltage is rated at 4170Vrms compared to 5300Vrms for the 4N30S. Applications requiring the full 5300Vrms isolation specification cannot use this substitute. Additionally, the operating temperature range is limited to -40°C to 100°C, excluding the -55°C minimum of the original part.

Q: What are the key differences between 4N30SM and 4N30SMT&R?

A: Both parts maintain the Darlington with Base output configuration and 6-SMD Gull Wing package. The primary differences are: 4N30SM has 150mA output current and 4170Vrms isolation; 4N30SMT&R has 10mA output current and 7.5Vpk isolation. The 4N30SMT&R is available in Tape & Reel packaging and is ROHS3 compliant. Selection depends on output current requirements and isolation voltage specifications for the target application.

Q: Is the 4N30SMT&R suitable for high-current applications?

A: No. The 4N30SMT&R is rated for 10mA output current per channel, compared to 150mA for the 4N30S. This part is suitable only for low-current signal isolation applications. Applications requiring 150mA output current must use the 4N30SM or identify alternative components with higher current ratings.

Q: What packaging options are available for these substitutes?

A: The 4N30SM is available in Bulk packaging. The 4N30SMT&R is available in Tape & Reel (TR) packaging. Both maintain the 6-SMD, Gull Wing surface mount format compatible with the original 4N30S package footprint.

Q: Are there compliance or regulatory differences between these parts?

A: The 4N30SMT&R is ROHS3 compliant. Compliance information for the 4N30SM is not specified in the provided data. All three parts carry EAR99 ECCN classification and HTSUS code 8541.49.8000. The 4N30S and 4N30SMT&R are REACH Unaffected.