EL815(M) Optoisolator Equivalent & Substitute Parts

Part Overview

The EL815(M) is a single-channel optoisolator with Darlington output manufactured by Everlight Electronics Co Ltd. This component provides 5000Vrms isolation and is designed for DC input applications requiring galvanic isolation in 4-DIP through-hole packaging. The part is currently in Active product status with 890 pieces available in inventory.

Substitute parts become necessary when the primary component reaches end-of-life status, experiences supply constraints, or when design requirements permit operation within the electrical and mechanical tolerances of alternative qualified components. The K815P represents a functionally compatible alternative from Vishay Semiconductor Opto Division, though it carries Last Time Buy status and requires evaluation against specific application parameters.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Number of Channels	1	Channel	Critical - must match for pin compatibility
Voltage - Isolation	5000	Vrms	Critical - defines isolation capability
Current Transfer Ratio (Min)	600	% @ 1mA	Critical - defines output current capability
Output Type	Darlington	-	Critical - determines output stage characteristics
Voltage - Output (Max)	35	V	Critical - maximum collector voltage rating
Current - Output / Channel	80	mA	Critical - maximum output current per channel
Input Type	DC	-	Critical - input signal type
Mounting Type	Through Hole	-	Critical - PCB assembly compatibility
Package / Case	4-DIP	-	Critical - physical form factor
Operating Temperature	-55°C ~ 110°C	°C	Important - defines operational environment
RoHS Status	ROHS3 Compliant	-	Important - regulatory compliance

Substitute Part Grouping Explanation

Substitution compatibility for the EL815(M) is determined by alignment across the following critical parameters:

Mandatory Matching Parameters:

Single channel configuration (1 Channel)
Darlington output stage topology
DC input type
Through-hole mounting technology
4-DIP package form factor
Isolation voltage rating of 5000Vrms or higher
Maximum output voltage of 35V or higher
Output current capability of 80mA or higher per channel
Minimum current transfer ratio of 600% @ 1mA or higher

Compliance Parameters:

ROHS3 compliance status
Operating temperature range that encompasses or exceeds the application requirement

The K815P from Vishay meets all mandatory matching parameters with the following considerations: it provides 5300Vrms isolation (exceeds requirement), maintains 600% minimum current transfer ratio, supports 80mA output current, and operates within a -40°C to 100°C range. Physical package dimensions differ (0.300" vs 0.400" DIP spacing), requiring PCB layout verification for pin-to-pin compatibility despite both being 4-DIP configurations.

Parameter Comparison

Parameter	EL815(M) (Everlight)	K815P (Vishay)	Unit	Notes
Manufacturer	Everlight Electronics Co Ltd	Vishay Semiconductor Opto Division	-	Different manufacturers
Product Status	Active	Last Time Buy	-	EL815(M) has longer availability
Number of Channels	1	1	Channel	Match
Voltage - Isolation	5000	5300	Vrms	K815P exceeds requirement
Current Transfer Ratio (Min)	600	600	% @ 1mA	Match
Output Type	Darlington	Darlington	-	Match
Voltage - Output (Max)	35	35	V	Match
Current - Output / Channel	80	80	mA	Match
Voltage - Forward (Vf) (Typ)	1.2	1.2	V	Match
Current - DC Forward (If) (Max)	60	60	mA	Match
Vce Saturation (Max)	1	0.1	V	K815P has lower saturation voltage
Input Type	DC	DC	-	Match
Mounting Type	Through Hole	Through Hole	-	Match
Package / Case	4-DIP (0.400", 10.16mm)	4-DIP (0.300", 7.62mm)	-	Different DIP spacing
Operating Temperature	-55°C ~ 110°C	-40°C ~ 100°C	°C	EL815(M) has wider range
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	-	Match
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	-	Match

Engineering Selection Recommendations

EL815(M) Selection Criteria: The EL815(M) is the primary component choice when supply availability is not constrained. It maintains Active product status, ensuring long-term availability and consistent manufacturing processes. The component offers the widest operating temperature range (-55°C to 110°C), making it suitable for applications requiring extended thermal performance. Current inventory of 890 pieces supports immediate deployment. ROHS3 compliance and MSL Level 1 rating confirm regulatory and environmental qualification.

K815P Selection Criteria: The K815P is a functionally equivalent substitute when EL815(M) availability becomes limited or when the application environment permits operation within the -40°C to 100°C temperature range. The K815P provides superior isolation voltage (5300Vrms vs 5000Vrms) and lower Vce saturation voltage (0.1V vs 1V), which may provide marginal performance benefits in specific circuit topologies. However, K815P carries Last Time Buy status, indicating this component will not be replenished after current inventory depletion. The different DIP package spacing (0.300" vs 0.400") requires PCB layout verification to confirm pin-to-pin compatibility despite both using 4-DIP form factors.

Substitution Feasibility: Direct substitution of K815P for EL815(M) is electrically permissible based on matching isolation voltage, output current, and transfer ratio specifications. Physical package spacing differences necessitate PCB design review before implementation. The narrower operating temperature range of K815P restricts its use to applications not exceeding 100°C maximum ambient conditions.

Frequently Asked Questions (FAQ)

Q: Can K815P directly replace EL815(M) on existing PCBs?

A: Electrical substitution is feasible based on matching channel count, isolation voltage, output current, and Darlington topology. However, the 4-DIP package spacing differs (0.300" for K815P vs 0.400" for EL815(M)). PCB layout verification is required to confirm pin-to-pin hole alignment before physical substitution. If PCB holes are spaced for 0.400" DIP, the K815P will not fit without board modification.

Q: What are the key electrical differences between these parts?

A: Both components share identical specifications for isolation voltage (5000Vrms minimum), current transfer ratio (600% minimum @ 1mA), maximum output voltage (35V), and output current (80mA). The K815P provides higher isolation voltage (5300Vrms) and lower saturation voltage (0.1V vs 1V). The EL815(M) supports a wider operating temperature range (-55°C to 110°C vs -40°C to 100°C for K815P).

Q: Why does product status matter for component selection?

A: EL815(M) maintains Active status, indicating ongoing manufacturing and availability for future orders. K815P is designated Last Time Buy, meaning current inventory represents the final production run. After K815P inventory depletion, no additional units will be manufactured. For long-term production programs, EL815(M) is the appropriate choice to ensure supply continuity.

Q: Are both components RoHS compliant?

A: Yes, both EL815(M) and K815P are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings, confirming regulatory qualification for current electronic assembly standards.

Q: What is the significance of the different Vce saturation voltages?

A: EL815(M) has 1V maximum saturation voltage while K815P has 0.1V maximum. Lower saturation voltage reduces power dissipation in the output stage and may improve switching speed in specific circuit applications. This difference is relevant only in designs where output stage voltage drop significantly impacts circuit performance.

Q: Can I use K815P in applications requiring -55°C operation?

A: No. K815P operates only to -40°C minimum, making it unsuitable for applications requiring -55°C operation. EL815(M) supports the full -55°C to 110°C range and is the required choice for extended low-temperature environments.

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