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

Part Overview

The EL817(M)(D) 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 maintains active product status with 1011 units in current inventory. 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)(D)

Everlight Electronics Co LtdIn Stock: 1056EL817(M)(D) Datasheet

Current PartRFQ

140817141410

Würth ElektronikIn Stock: 956140817141410 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the EL817(M)(D) optoisolator is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Voltage isolation rating: 5000Vrms (no reduction permitted)
• Number of channels: 1 (single channel only)
• Current transfer ratio range: 300% to 600% @ 5mA (minimum and maximum bounds must be met)
• Output type: Transistor (phototransistor configuration)
• Maximum output voltage: 35V
• Maximum output current per channel: 50mA
• Vce saturation: 200mV maximum

Mechanical Equivalence Criteria:

• Package form factor: 4-DIP with 0.400" (10.16mm) pitch
• Mounting type: Through Hole
• Operating temperature range: -55°C to 110°C minimum

Compliance Criteria:

• RoHS3 compliance required
• Moisture sensitivity level: 1 (Unlimited)

The substitute part 140817141410 (Würth Elektronik WL-OCPT series) meets all electrical, mechanical, and compliance requirements for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: EL817(M)(D)

The EL817(M)(D) from Everlight Electronics maintains active product status with established supply availability (1011 units in stock). This component is ROHS3 compliant and carries EAR99 export classification. Selection of the primary part is appropriate when existing supply chains are established and design validation has been completed against this specific manufacturer's device.

Substitute Part: 140817141410 (Würth Elektronik WL-OCPT)

The 140817141410 optoisolator from Würth Elektronik provides complete electrical and mechanical equivalence to the EL817(M)(D). This substitute maintains:

• Identical 5000Vrms isolation voltage
• Matching current transfer ratio specifications (300% to 600% @ 5mA)
• Equivalent transistor output characteristics (35V maximum, 50mA per channel)
• Identical 4-DIP through-hole package form factor
• ROHS3 compliance with EAR99 classification
• Unlimited moisture sensitivity rating (MSL 1)

The Würth Elektronik part is supplied in tube packaging and carries 936 units in current inventory. REACH status is listed as unaffected. This substitute is suitable for direct replacement in applications where component sourcing requires alternative manufacturer qualification or when primary supply becomes constrained.

Both parts operate across the -55°C to 110°C temperature range and satisfy identical compliance and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the 140817141410 be used as a direct replacement for the EL817(M)(D) in existing circuit designs?

A: Yes. The 140817141410 meets all electrical specifications, isolation voltage, output current capacity, and package requirements of the EL817(M)(D). Both components feature identical 4-DIP through-hole packaging with 0.400" (10.16mm) pitch, enabling direct PCB footprint compatibility without layout modification.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution is determined by equivalence in: isolation voltage (5000Vrms), number of channels (1), current transfer ratio range (300% to 600% @ 5mA), output type (transistor), maximum output voltage (35V), maximum output current (50mA per channel), and Vce saturation (200mV maximum). All substitute parts must meet these specifications without deviation.

Q: Are there differences in forward voltage between the EL817(M)(D) and 140817141410?

A: The EL817(M)(D) specifies typical forward voltage (Vf) of 1.2V, while the 140817141410 specifies 1.24V. This 0.04V difference is within normal component tolerance and does not affect circuit functionality or compatibility.

Q: Do both parts carry the same compliance certifications?

A: Yes. Both the EL817(M)(D) and 140817141410 are ROHS3 compliant, carry EAR99 export classification, and share identical HTSUS code 8541.49.8000. Both maintain MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the difference between the supplier device packages listed for each part?

A: The EL817(M)(D) is listed with supplier device package "4-DIP" while the 140817141410 is listed as "4-DIP-M". Both refer to the same 4-DIP form factor with 0.400" (10.16mm) pitch. The "-M" designation in the Würth part indicates tube packaging format, which does not affect electrical performance or PCB mounting compatibility.

Q: Are the rise and fall times identical between these parts?

A: The rise and fall times are equivalent but listed in different order. The EL817(M)(D) specifies 4µs rise time and 3µs fall time, while the 140817141410 specifies 3µs rise time and 4µs fall time. Both configurations meet the same switching performance envelope for this component category.

Q: Can I mix EL817(M)(D) and 140817141410 parts in the same production batch?

A: Yes. Both parts meet identical electrical and mechanical specifications, operate across the same temperature range, and carry equivalent compliance certifications. Mixing is permissible from a functional and regulatory standpoint, though design documentation should reflect the use of both manufacturers' parts.

Q: What inventory status should influence part selection?

A: The EL817(M)(D) has 1011 units in stock while the 140817141410 has 936 units available. Both represent adequate supply for production planning. Selection should be based on established supplier relationships, lead time requirements, and design validation history rather than inventory quantity alone.