EL817(M)(A) Optoisolator Equivalent & Substitute Parts

Part Overview

The EL817(M)(A) is a single-channel optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This component provides 5000Vrms isolation and is designed for DC input applications requiring galvanic isolation in through-hole 4-DIP packaging. The part is currently in active production status with 941 units in stock. Substitute parts are identified when equivalent electrical performance, isolation rating, package form factor, and compliance certifications align with the original specification, enabling direct replacement in circuit designs without functional degradation.

Substiute Parts

EL817(M)(A)

Everlight Electronics Co LtdIn Stock: 997EL817(M)(A) Datasheet

Current PartRFQ

140817141110

Würth ElektronikIn Stock: 953140817141110 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the EL817(M)(A) are qualified based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Voltage - Isolation: 5000Vrms (exact match required)
• Number of Channels: 1 (exact match required)
• Output Type: Transistor (exact match required)
• Package / Case: 4-DIP form factor (exact match required)
• Mounting Type: Through Hole (exact match required)
• Current Transfer Ratio range: 80% - 160% @ 5mA (exact match required)
• Voltage - Output (Max): 35V (exact match required)
• Current - Output / Channel: 50mA (exact match required)
• Vce Saturation (Max): 200mV (exact match required)
• Operating Temperature: -55°C ~ 110°C (exact match required)
• RoHS Status: ROHS3 Compliant (compliance match required)

Allowable Variations:

• Rise / Fall Time (Typ): Minor variations within microsecond range acceptable
• Voltage - Forward (Vf) (Typ): Variations within ±0.04V acceptable
• Packaging format (Tube vs. standard): Acceptable if electrical specifications identical

The substitute part 140817141110 from Würth Elektronik meets all critical matching parameters and is therefore qualified as a direct parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: EL817(M)(A)

The EL817(M)(A) from Everlight Electronics Co Ltd is the original specification component. It is actively manufactured, ROHS3 compliant, and carries MSL Level 1 rating indicating unlimited shelf life under standard storage conditions. Current inventory of 941 units supports immediate procurement for production requirements.

Substitute Part: 140817141110 (Würth Elektronik WL-OCPT Series)

The 140817141110 is a parametric equivalent optoisolator qualified for direct substitution. All critical electrical parameters match the EL817(M)(A) specification exactly. The component is actively produced, ROHS3 compliant, and carries identical MSL Level 1 rating. The Würth Elektronik part is supplied in Tube packaging format and carries REACH Unaffected status. Current inventory of 858 units is available.

Selection Basis:

Both parts satisfy identical functional requirements for 5000Vrms isolation, single-channel transistor output, 4-DIP through-hole mounting, and -55°C to 110°C operating temperature range. Selection between these parts may be based on:

• Supplier availability and lead time
• Packaging format preference (standard vs. Tube)
• Procurement cost and volume pricing
• Existing supply chain relationships
• Regional compliance documentation requirements

Both parts are suitable for direct PCB placement without circuit modification or performance degradation.

Frequently Asked Questions (FAQ)

Q: Can the 140817141110 be used as a direct replacement for the EL817(M)(A) on existing PCBs?

A: Yes. The 140817141110 is a parametric equivalent with identical package form factor (4-DIP), pin configuration, and electrical specifications. No PCB layout modification is required for substitution.

Q: What is the significance of the rise and fall time difference between these parts?

A: The EL817(M)(A) specifies 4µs rise time and 3µs fall time, while the 140817141110 specifies 3µs rise time and 4µs fall time. Both configurations fall within acceptable switching performance for typical optoisolator applications. The reversed order reflects different measurement methodology or device characterization but does not affect functional compatibility.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant and carry MSL Level 1 rating. The 140817141110 additionally carries REACH Unaffected status. Both parts are classified under ECCN EAR99 and HTSUS 8541.49.8000. No compliance barriers exist for substitution.

Q: What does the forward voltage difference (1.2V vs. 1.24V) mean for circuit design?

A: The 0.04V difference in typical forward voltage is within normal component tolerance and does not require circuit redesign. Both values fall within the same operational envelope for LED input current limiting calculations.

Q: Is the Tube packaging format compatible with standard pick-and-place assembly equipment?

A: Tube packaging is compatible with standard through-hole assembly processes. Tube format may require different feeder setup on automated insertion equipment compared to standard packaging, but electrical performance and PCB compatibility remain identical.

Q: What inventory considerations should guide part selection?

A: The EL817(M)(A) has 941 units in stock, while the 140817141110 has 858 units available. For immediate production requirements, either part supports fulfillment. For long-term supply planning, both parts are actively manufactured and should maintain consistent availability.

Q: Can these parts be used interchangeably in new designs?

A: Yes. New circuit designs may specify either part number. Both components meet identical functional requirements for 5000Vrms isolation, single-channel transistor output applications in 4-DIP through-hole format. Design documentation should reference the specific part number selected for procurement.