EL816(S)(TD) Optoisolator Equivalent & Substitute Parts

Part Overview

The EL816(S)(TD) is a single-channel optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This component provides 5000Vrms isolation voltage in a 4-SMD surface mount package. The part is currently active in production with 882 pieces in stock inventory.

Equivalent and substitute parts are identified when design requirements permit component interchange due to matching electrical specifications, isolation ratings, output characteristics, and mechanical compatibility. Substitute parts enable procurement flexibility, alternative sourcing, and inventory optimization while maintaining circuit performance within specified parameters.

Key Parameters

Parameter	Value	Unit
Number of Channels	1	—
Voltage - Isolation	5000	Vrms
Current Transfer Ratio (Min)	50	% @ 5mA
Current Transfer Ratio (Max)	600	% @ 5mA
Output Type	Transistor	—
Voltage - Output (Max)	80	V
Current - Output / Channel	50	mA
Voltage - Forward (Vf) (Typ)	1.2	V
Current - DC Forward (If) (Max)	60	mA
Vce Saturation (Max)	200	mV
Operating Temperature	-55 to 110	°C
Mounting Type	Surface Mount	—
Package / Case	4-SMD, Gull Wing	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the EL816(S)(TD) are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Single channel configuration
Isolation voltage rating of 5000Vrms or higher
Transistor output type
Maximum output voltage of 80V
Maximum output current of 50mA per channel
4-SMD surface mount package with gull wing leads
Operating temperature range encompassing -55°C to 110°C
Current Transfer Ratio range of 50% to 600% @ 5mA

Secondary Compatibility Factors:

RoHS3 compliance
MSL rating of 1 (Unlimited)
Input type: DC
Vce saturation maximum of 200mV or lower

Parts meeting these criteria are classified as parametric equivalents or similar alternatives. Variations in rise/fall time, turn-on/turn-off time, or isolation voltage above the minimum threshold do not preclude substitution when all primary electrical and mechanical parameters align.

Parameter Comparison

Parameter	EL816(S)(TD)	EL8171S1(TU)-G	LTV-816S	LTV-816S-TA1	VO618A-4X017T
Manufacturer	Everlight	Everlight	Lite-On	Lite-On	Vishay
Number of Channels	1	1	1	1	1
Voltage - Isolation (Vrms)	5000	5000	5000	5000	5300
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	160% @ 1mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	320% @ 1mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.2V	1.2V	1.2V	1.2V	1.1V
Current - DC Forward (If) (Max)	60mA	60mA	50mA	50mA	60mA
Vce Saturation (Max)	200mV	200mV	200mV	200mV	400mV
Operating Temperature	-55 to 110°C	-55 to 110°C	-50 to 110°C	-50 to 110°C	-55 to 110°C
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active
Inventory (Pcs)	882	5099	1900	6300	12520

Engineering Selection Recommendations

EL8171S1(TU)-G (Everlight Electronics)

This part is a parametric equivalent to the EL816(S)(TD). All primary electrical specifications match exactly: 5000Vrms isolation, 50-600% current transfer ratio at 5mA, 80V maximum output voltage, and 50mA output current. The component maintains identical operating temperature range, RoHS3 compliance, and MSL rating. The primary difference is packaging format (Tape & Reel versus standard SMD). This part is suitable for direct substitution in production environments requiring reel packaging. Inventory availability is significantly higher at 5099 pieces.

LTV-816S (Lite-On Inc.)

This part meets all primary electrical and mechanical requirements for substitution. Isolation voltage, output specifications, and package type are identical to the EL816(S)(TD). The maximum DC forward current is specified at 50mA versus 60mA for the main part, which remains within acceptable operating margins. Operating temperature range is -50°C to 110°C, which covers the upper specification but has a 5°C reduction at the lower limit. This part is suitable for applications where the lower temperature limit of -50°C is acceptable. Inventory is 1900 pieces.

LTV-816S-TA1 (Lite-On Inc.)

This part is functionally equivalent to LTV-816S with identical electrical specifications and the same operating temperature range of -50°C to 110°C. The primary distinction is Tape & Reel packaging format, which is suitable for automated assembly processes. All electrical parameters, isolation voltage, output current, and saturation voltage match the substitution criteria. RoHS3 compliance and MSL rating are confirmed. This part offers the highest inventory availability at 6300 pieces, making it suitable for high-volume procurement scenarios.

VO618A-4X017T (Vishay Semiconductor Opto Division)

This part provides higher isolation voltage at 5300Vrms, exceeding the 5000Vrms requirement. The component meets all mechanical requirements with identical 4-SMD gull wing packaging. However, the current transfer ratio specification differs: 160-320% @ 1mA versus 50-600% @ 5mA for the main part. The Vce saturation is specified at 400mV maximum, which is double the 200mV specification of the EL816(S)(TD). These differences indicate different performance characteristics in switching speed and saturation behavior. This part is suitable for substitution only when circuit design accommodates higher saturation voltage and different current transfer ratio characteristics. Inventory is 12520 pieces, the highest among all alternatives.

Frequently Asked Questions (FAQ)

Q: Can the EL8171S1(TU)-G replace the EL816(S)(TD) in existing designs?

A: Yes. The EL8171S1(TU)-G is a parametric equivalent with identical electrical specifications including isolation voltage, current transfer ratio, output voltage, and output current. The primary difference is packaging format (Tape & Reel). Both parts use the same 4-SMD gull wing package footprint and are compatible with identical PCB layouts. No circuit modifications are required.

Q: What is the difference between LTV-816S and LTV-816S-TA1?

A: Both parts are electrically identical with the same isolation voltage, current transfer ratio, output specifications, and operating temperature range. The difference is packaging format: LTV-816S is supplied in Tube packaging, while LTV-816S-TA1 is supplied in Tape & Reel format. Selection depends on assembly process requirements. Tape & Reel format is preferred for automated pick-and-place assembly.

Q: Can I use the VO618A-4X017T as a direct replacement for the EL816(S)(TD)?

A: The VO618A-4X017T meets the mechanical and isolation voltage requirements but has different electrical characteristics. The Vce saturation is 400mV versus 200mV for the main part, and the current transfer ratio is specified at different test conditions (160-320% @ 1mA versus 50-600% @ 5mA). This part is suitable for substitution only when circuit design has been verified to accommodate these differences. Consult circuit requirements before selection.

Q: What is the operating temperature difference between Everlight and Lite-On parts?

A: Everlight parts (EL816(S)(TD) and EL8171S1(TU)-G) specify -55°C to 110°C. Lite-On parts (LTV-816S and LTV-816S-TA1) specify -50°C to 110°C. The difference is 5°C at the lower temperature limit. For applications requiring operation below -50°C, Everlight parts are required. For applications within -50°C to 110°C range, both manufacturers are suitable.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts including EL8171S1(TU)-G, LTV-816S, LTV-816S-TA1, and VO618A-4X017T are confirmed RoHS3 compliant. All parts have MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions.

Q: Which substitute part has the best inventory availability?

A: The VO618A-4X017T has the highest inventory at 12520 pieces. Among Everlight and Lite-On alternatives, LTV-816S-TA1 has the highest availability at 6300 pieces. The main part EL816(S)(TD) has 882 pieces in stock.

Q: Can I mix different manufacturers in the same production batch?

A: Yes, provided all parts meet the circuit's electrical and mechanical requirements. All listed substitute parts are electrically compatible within their specified parameters and use identical 4-SMD gull wing packaging. However, verify that any differences in current transfer ratio or saturation voltage do not affect circuit performance. Consult design documentation and perform validation testing if mixing manufacturers in critical applications.

Q: What packaging formats are available for these optoisolators?

A: The EL816(S)(TD) is available in standard SMD packaging. The EL8171S1(TU)-G is supplied in Tape & Reel format. Lite-On parts are available in both Tube (LTV-816S) and Tape & Reel (LTV-816S-TA1) formats. The VO618A-4X017T is supplied in Tape & Reel format. Selection depends on assembly process requirements and inventory management preferences.

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