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

Part Overview

The EL817(M)(C) 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 934 units in current inventory. Substitute parts are identified when equivalent electrical performance, isolation rating, and mechanical compatibility are maintained across alternative manufacturers while meeting the same regulatory and environmental standards.

Substiute Parts

EL817(M)(C)

Everlight Electronics Co LtdIn Stock: 1010EL817(M)(C) Datasheet

Current PartRFQ

140817141310

Würth ElektronikIn Stock: 1330140817141310 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Isolation and Safety: Voltage isolation rating must equal 5000Vrms to maintain galvanic separation in the target application.

Optical Transfer Characteristics: Current transfer ratio range (200% to 400% @ 5mA) defines the optical coupling efficiency and must be maintained for consistent signal transmission.

Output Stage Performance: Transistor output type, maximum output voltage (35V), output current capacity (50mA), and saturation voltage (200mV maximum) must remain constant to ensure compatible drive capability.

Thermal Operating Range: The -55°C to 110°C operating temperature window must be supported by the substitute part.

Mechanical Compatibility: Through-hole mounting in 4-DIP package with 0.400" (10.16mm) body dimensions is required for PCB footprint compatibility.

Regulatory Compliance: ROHS3 compliance and MSL Level 1 rating must be maintained.

The substitute part 140817141310 (Würth Elektronik WL-OCPT series) meets all these criteria with identical isolation voltage, current transfer ratio range, output specifications, temperature range, and package dimensions.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection - EL817(M)(C): The Everlight Electronics EL817(M)(C) is the specified component with active product status and established supply availability (934 units in stock). This part is ROHS3 compliant and carries MSL Level 1 rating, indicating no moisture sensitivity constraints during storage and handling.

Substitute Selection - 140817141310: The Würth Elektronik WL-OCPT series part 140817141310 provides full parametric equivalence to the EL817(M)(C). This substitute maintains identical isolation voltage, current transfer ratio specifications, output stage performance, and operating temperature range. Both parts are ROHS3 compliant with MSL Level 1 rating. The Würth part is available in tube packaging with 1263 units in current inventory. The forward voltage specification differs marginally (1.24V vs 1.2V typical), which remains within acceptable circuit design tolerances for DC input optoisolator applications.

Compliance Basis: Both parts carry ROHS3 compliance certification and are classified under ECCN EAR99 with HTSUS code 8541.49.8000. Selection between these parts may be based on supply chain availability, lead time requirements, or established vendor relationships, as electrical and mechanical performance are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the 140817141310 be used as a direct replacement for the EL817(M)(C) on existing PCBs?

A: Yes. Both parts use identical 4-DIP through-hole packaging with 0.400" (10.16mm) body dimensions. Pin configuration and electrical specifications are equivalent, enabling direct PCB footprint compatibility without layout modifications.

Q: Are there differences in the rise and fall time specifications between these parts?

A: The EL817(M)(C) specifies rise/fall times of 4µs and 3µs respectively, while the 140817141310 specifies 3µs and 4µs. Both parts meet the same switching speed envelope and are suitable for equivalent applications. Specific timing requirements should be evaluated against circuit design specifications.

Q: What is the significance of the forward voltage difference (1.2V vs 1.24V)?

A: The forward voltage difference of 0.04V is within normal manufacturing tolerance for LED-based optoisolators. For DC input circuits, this variation does not affect functional performance or circuit operation. Input current limiting resistor values should be calculated based on the specific supply voltage and desired input current, accommodating this minor variation.

Q: Do both parts require the same handling and storage conditions?

A: Yes. Both parts carry MSL Level 1 (Unlimited) rating, indicating no moisture sensitivity constraints. Standard ESD precautions and room-temperature storage conditions apply to both components.

Q: What is the basis for confirming these parts are true equivalents?

A: Equivalence is established through matching of all critical electrical parameters: 5000Vrms isolation voltage, 200-400% current transfer ratio at 5mA, 35V maximum output voltage, 50mA output current capacity, 200mV maximum saturation voltage, and -55°C to 110°C operating temperature range. Mechanical compatibility is confirmed through identical 4-DIP through-hole packaging. Regulatory compliance (ROHS3, MSL Level 1) is matched across both parts.

Q: Are there any application restrictions when using the substitute part?

A: No application restrictions exist beyond those specified in the component datasheets. Both parts are rated for identical electrical and thermal operating conditions. Circuit design considerations remain unchanged when substituting between these parts.