EL814S(TA) Optoisolator Equivalent & Substitute Parts

Part Overview

The EL814S(TA) is a 5000Vrms optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This component provides galvanic isolation for AC and DC input signals with a single-channel transistor output configuration in a 4-SMD surface mount package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value
Voltage - Isolation	5000Vrms
Number of Channels	1
Output Type	Transistor
Input Type	AC, DC
Voltage - Output (Max)	80V
Current Transfer Ratio (Min)	20% @ 1mA
Vce Saturation (Max)	200mV
Operating Temperature Range	-55°C ~ 110°C
Package / Case	4-SMD, Gull Wing
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the EL814S(TA) are identified based on strict equivalence of the following critical parameters:

Mandatory Matching Parameters:

Voltage - Isolation: 5000Vrms
Number of Channels: 1
Output Type: Transistor
Input Type: AC, DC
Package / Case: 4-SMD, Gull Wing
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Acceptable Parameter Variations: Substitute parts may differ in Current Transfer Ratio specifications, Voltage - Output (Max), Current - Output / Channel, and Operating Temperature Range, provided the substitute meets or exceeds the minimum isolation voltage and maintains the same package and output configuration.

The identified substitutes—LTV-814HS and LTV-814HS-TA1 from Lite-On Inc.—satisfy all mandatory matching parameters and are classified as active products with confirmed inventory availability.

Parameter Comparison

Parameter	EL814S(TA)	LTV-814HS	LTV-814HS-TA1
Manufacturer	Everlight Electronics Co Ltd	Lite-On Inc.	Lite-On Inc.
Product Status	Discontinued at DiGi Electronics	Active	Active
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1
Output Type	Transistor	Transistor	Transistor
Input Type	AC, DC	AC, DC	AC, DC
Voltage - Output (Max)	80V	35V	35V
Current Transfer Ratio (Min)	20% @ 1mA	20% @ 100mA	20% @ 100mA
Current Transfer Ratio (Max)	300% @ 1mA	80% @ 100mA	80% @ 100mA
Rise / Fall Time (Typ)	7µs, 11µs	4µs, 3µs	4µs, 3µs
Voltage - Forward (Vf) (Typ)	1.2V	1.4V	1.4V
Current - DC Forward (If) (Max)	60 mA	150 mA	150 mA
Vce Saturation (Max)	200mV	200mV	200mV
Operating Temperature	-55°C ~ 110°C	-30°C ~ 100°C	-30°C ~ 100°C
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Packaging	-	Tube	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

LTV-814HS and LTV-814HS-TA1 Suitability:

Both LTV-814HS and LTV-814HS-TA1 are direct functional substitutes for the discontinued EL814S(TA). Both parts are manufactured by Lite-On Inc., maintain active product status, and carry ROHS3 compliance certification. The primary distinction between these two substitutes is packaging format: LTV-814HS is supplied in Tube packaging, while LTV-814HS-TA1 is supplied in Tape & Reel (TR) format.

Design Consideration:

The substitute parts exhibit lower maximum output voltage (35V versus 80V) and reduced operating temperature range (-30°C ~ 100°C versus -55°C ~ 110°C) compared to the original EL814S(TA). Applications requiring the full 80V output capability or extended low-temperature operation below -30°C must evaluate circuit requirements against these parameter differences. The substitute parts demonstrate faster rise and fall times (4µs and 3µs respectively) and higher maximum forward current capability (150 mA versus 60 mA), which may provide performance advantages in certain switching applications.

Packaging Selection:

For high-volume production environments, LTV-814HS-TA1 in Tape & Reel format is recommended. For lower-volume or prototype applications, LTV-814HS in Tube packaging provides equivalent electrical performance with alternative handling logistics.

Frequently Asked Questions (FAQ)

Q: Can LTV-814HS or LTV-814HS-TA1 directly replace EL814S(TA) in existing designs?

A: Direct replacement is possible for applications where the output voltage requirement does not exceed 35V and the operating temperature range remains within -30°C to 100°C. The 5000Vrms isolation voltage, single-channel transistor output configuration, 4-SMD package, and surface mount characteristics are identical. Pin-to-pin compatibility must be confirmed against the specific PCB layout and schematic requirements.

Q: What are the key differences between LTV-814HS and LTV-814HS-TA1?

A: LTV-814HS and LTV-814HS-TA1 are electrically identical. The difference is packaging: LTV-814HS is supplied in Tube format, while LTV-814HS-TA1 is supplied in Tape & Reel (TR) format. Selection depends on production volume and assembly equipment compatibility.

Q: Why does the substitute have a lower maximum output voltage (35V vs 80V)?

A: The LTV-814HS and LTV-814HS-TA1 are designed with different output transistor specifications. Applications requiring 80V output capability must retain the original EL814S(TA) or identify alternative optoisolators with higher output voltage ratings.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both LTV-814HS and LTV-814HS-TA1 are ROHS3 compliant, matching the compliance status of the original EL814S(TA).

Q: What is the inventory status of substitute parts?

A: LTV-814HS has 16,958 pieces in stock. LTV-814HS-TA1 has 2,200 pieces in stock. Both are classified as active products with confirmed availability.

Q: How do the switching characteristics compare?

A: The substitute parts exhibit faster switching performance: rise time of 4µs and fall time of 3µs, compared to 7µs and 11µs for the original EL814S(TA). This faster switching may improve performance in high-frequency applications.

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