4N27300 Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N27300 is an optoisolator transistor with base output manufactured by onsemi, rated for 5300Vrms isolation voltage in a 6-DIP through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 4N27300 provides galvanic isolation with a single-channel transistor output configuration suitable for DC input applications requiring high voltage isolation and switching functionality.

Substiute Parts

4N27300

onsemiIn Stock: 10714N27300 Datasheet

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4N27

Texas InstrumentsIn Stock: 136974N27 Datasheet

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4N27

Texas InstrumentsIn Stock: 136974N27 Datasheet

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4N27-X000

Vishay Semiconductor Opto DivisionIn Stock: 9354N27-X000 Datasheet

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4N27X

Isocom Components 2004 LTDIn Stock: 10224N27X Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 4N27300 is determined by the following critical parameters:

• Isolation Voltage: Minimum 5000Vrms (4N27300 rated at 5300Vrms)
• Number of Channels: 1 channel required
• Output Type: Transistor with Base configuration
• Package / Case: 6-DIP (0.300", 7.62mm) through-hole mounting
• Input Type: DC
• Operating Temperature Range: -55°C ~ 100°C minimum
• Current Transfer Ratio (Min): 10% @ 10mA
• Vce Saturation (Max): 500mV

Substitute parts must meet or exceed these electrical specifications and maintain identical package and mounting characteristics. Parts are grouped by manufacturer and product status (Active vs. Obsolete).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 4N27X (Isocom Components 2004 LTD)

The 4N27X is the closest functional equivalent to the 4N27300. It maintains identical isolation voltage (5300Vrms), maximum output voltage (30V), and operating temperature range. The 4N27X is currently in active production status with ROHS3 compliance and REACH Unaffected designation, making it suitable for new designs and long-term availability. Current transfer ratio and saturation characteristics are equivalent.

Secondary Substitute: 4N27-X000 (Vishay Semiconductor Opto Division)

The 4N27-X000 meets all critical electrical parameters with 5000Vrms isolation voltage, matching current transfer ratio, and identical saturation voltage. This part is active and ROHS3 compliant. The maximum output voltage is rated at 70V, providing additional headroom compared to the 4N27300. Vishay's established supply chain supports consistent availability.

Alternative Substitute: 4N27 (Texas Instruments)

The 4N27 from Texas Instruments meets core electrical specifications with 5000Vrms isolation and equivalent current transfer ratio. This part is active and widely available. However, it is RoHS non-compliant and REACH Affected, which may restrict use in regulated applications or regions with environmental compliance requirements. The 70V maximum output voltage exceeds the 4N27300 specification.

All substitute parts maintain the 6-DIP through-hole package, enabling direct PCB footprint compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the 4N27 (Texas Instruments) be used as a direct replacement for the 4N27300?

A: The 4N27 meets the core electrical specifications including isolation voltage (5000Vrms minimum), current transfer ratio, and package configuration. However, it is RoHS non-compliant and REACH Affected, which may conflict with design or regulatory requirements. Verify compliance requirements before selection.

Q: What is the key difference between the 4N27X and 4N27-X000?

A: Both parts are functionally equivalent with isolation voltages of 5300Vrms and 5000Vrms respectively. The 4N27X maintains the 30V maximum output voltage matching the 4N27300, while the 4N27-X000 is rated for 70V output. Both are ROHS3 compliant and actively produced. Selection depends on output voltage requirements and supplier availability.

Q: Is the 6-DIP package identical across all substitute parts?

A: Yes. All substitute parts use the 6-DIP (0.300", 7.62mm) through-hole package with identical pin spacing and mounting characteristics. No PCB layout modifications are required for substitution.

Q: Why is the 4N27300 listed as obsolete?

A: The 4N27300 is no longer in active production by onsemi. Substitute parts from active manufacturers (Isocom, Vishay, Texas Instruments) provide equivalent functionality with ongoing supply availability and support.

Q: Are there differences in forward voltage (Vf) between substitute parts?

A: Forward voltage varies slightly: 4N27300 at 1.18V, 4N27X at 1.2V, 4N27-X000 at 1.36V, and 4N27 at 1.3V. These variations are within typical operating tolerances for optoisolator applications. Verify circuit design margins if forward voltage is a critical parameter.

Q: What is the significance of REACH and RoHS compliance status?

A: REACH Unaffected and ROHS3 Compliant designations indicate compliance with European environmental and hazardous substance regulations. These certifications are required for products sold in regulated markets. The 4N27X and 4N27-X000 meet these requirements, while the 4N27 does not.