EL817(S)(A)(TA) Optoisolator Equivalent & Substitute Parts

Part Overview

The EL817(S)(A)(TA) is a 5000Vrms isolation optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This single-channel device is configured in a 4-SMD surface mount package with gull wing leads. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain identical electrical and mechanical specifications for direct component substitution in existing designs.

Key Parameters

Parameter	Value
Manufacturer	Everlight Electronics Co Ltd
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	80% @ 5mA
Current Transfer Ratio (Max)	160% @ 5mA
Rise / Fall Time (Typ)	4µs, 3µs
Input Type	DC
Output Type	Transistor
Voltage - Output (Max)	35V
Current - Output / Channel	50mA
Voltage - Forward (Vf) (Typ)	1.2V
Current - DC Forward (If) (Max)	60 mA
Vce Saturation (Max)	200mV
Operating Temperature	-55°C ~ 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 EL817(S)(A)(TA) are identified based on strict parametric equivalence across all critical electrical and mechanical specifications. The substitution logic is based on the following key parameters that must match or exceed the original part:

Critical Matching Parameters:

Voltage - Isolation: 5000Vrms (mandatory match)
Number of Channels: 1 (mandatory match)
Current Transfer Ratio: 80% minimum @ 5mA (mandatory match)
Output Type: Transistor (mandatory match)
Voltage - Output (Max): 35V minimum (mandatory match)
Current - Output / Channel: 50mA minimum (mandatory match)
Vce Saturation (Max): 200mV maximum (mandatory match)
Operating Temperature: -55°C ~ 110°C (mandatory match)
Package / Case: 4-SMD, Gull Wing (mandatory match)
Mounting Type: Surface Mount (mandatory match)
RoHS Status: ROHS3 Compliant (mandatory match)

Parametric Equivalent Parts maintain identical specifications across all parameters and differ only in product status or packaging designation. These parts are direct replacements with no design modifications required.

Similar Parts from alternative manufacturers (Broadcom Limited HCPL-817 series) meet or exceed the critical isolation voltage, output characteristics, and package requirements but may have different operating temperature ranges or current transfer ratio specifications. These require engineering evaluation for specific application constraints.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Isolation	CTR Min @ 5mA	CTR Max @ 5mA	Voltage - Output (Max)	Current - Output	Vce Sat (Max)	Operating Temp	Inventory
EL817(S)(A)(TA)	Everlight	Discontinued	5000Vrms	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	1037 Pcs
EL817(S)(A)(TD)	Everlight	Active	5000Vrms	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	955 Pcs
EL817(S)(A)(TD)-V	Everlight	Active	5000Vrms	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	989 Pcs
EL817(S)(A)(TU)	Everlight	Active	5000Vrms	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	1057 Pcs
EL817(S)(A)(TU)-V	Everlight	Active	5000Vrms	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	747 Pcs
EL817(S1)(A)(TD)	Everlight	Active	5000Vrms	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	744 Pcs
EL817(S1)(A)(TD)-V	Everlight	Active	5000Vrms	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	1112 Pcs
EL817(S1)(A)(TU)	Everlight	Active	5000Vrms	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	702 Pcs
EL817S1(A)(TU)-V	Everlight	Active	5000Vrms	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	776 Pcs
HCPL-817-300E	Broadcom	Active	5000Vrms	50%	600%	70V	50mA	200mV	-30°C ~ 100°C	1217 Pcs
HCPL-817-30AE	Broadcom	Active	5000Vrms	80%	160%	70V	50mA	200mV	-30°C ~ 100°C	20200 Pcs

Engineering Selection Recommendations

Parametric Equivalent Substitutes (Direct Replacement):

The following Everlight EL817 variants are parametric equivalents with identical electrical and mechanical specifications to the discontinued EL817(S)(A)(TA):

EL817(S)(A)(TD)
EL817(S)(A)(TD)-V
EL817(S)(A)(TU)
EL817(S)(A)(TU)-V
EL817(S1)(A)(TD)
EL817(S1)(A)(TD)-V
EL817(S1)(A)(TU)
EL817S1(A)(TU)-V

All parametric equivalents maintain ROHS3 compliance, MSL Level 1 rating, and identical isolation voltage, current transfer ratio, output voltage, saturation characteristics, and operating temperature range. These parts are suitable for direct PCB substitution without circuit modification.

Similar Alternative Substitutes (Broadcom HCPL-817 Series):

The Broadcom HCPL-817-30AE provides parametric equivalence in isolation voltage, current transfer ratio (80%-160%), output current, and saturation voltage. This part exceeds the original specification with 70V maximum output voltage versus 35V, and maintains identical rise/fall time characteristics. Operating temperature range is -30°C ~ 100°C, which is narrower than the original -55°C ~ 110°C specification.

The Broadcom HCPL-817-300E provides 5000Vrms isolation and identical saturation voltage but differs in current transfer ratio (50%-600%) and operating temperature (-30°C ~ 100°C). This part is suitable only for applications where the wider CTR range and higher output voltage (70V) are acceptable.

Selection Criteria:

For direct replacement in existing designs: Select any parametric equivalent from the Everlight EL817 family
For extended low-temperature operation below -30°C: Parametric equivalents are required
For applications requiring output voltage above 35V: Broadcom HCPL-817-30AE or HCPL-817-300E
For high-volume procurement: HCPL-817-30AE offers 20,200 pieces inventory availability

Frequently Asked Questions (FAQ)

Q: Can I substitute EL817(S)(A)(TA) with EL817(S)(A)(TD)?

A: Yes. EL817(S)(A)(TD) is a parametric equivalent with identical isolation voltage (5000Vrms), current transfer ratio (80%-160% @ 5mA), output voltage (35V maximum), output current (50mA), saturation voltage (200mV maximum), operating temperature range (-55°C ~ 110°C), and package configuration (4-SMD, Gull Wing). The part is currently active with 955 pieces in stock.

Q: What is the difference between EL817(S)(A)(TD) and EL817(S1)(A)(TD)?

A: Both parts are parametric equivalents with identical electrical specifications. The designation difference (S versus S1) indicates a variant code within the Everlight EL817 product family. Both maintain 5000Vrms isolation, 80%-160% CTR, 35V output voltage, and -55°C ~ 110°C operating temperature. Selection between these variants should be based on availability and procurement lead time.

Q: Can I use HCPL-817-30AE as a substitute for EL817(S)(A)(TA)?

A: HCPL-817-30AE from Broadcom is a similar alternative that meets the critical isolation voltage (5000Vrms) and current transfer ratio (80%-160% @ 5mA) specifications. However, it differs in operating temperature range (-30°C ~ 100°C versus -55°C ~ 110°C) and provides higher maximum output voltage (70V versus 35V). This part is suitable for applications operating above -30°C where the higher output voltage capability is acceptable or beneficial.

Q: What does the "-V" suffix indicate in part numbers like EL817(S)(A)(TD)-V?

A: The "-V" suffix indicates a variant designation within the Everlight EL817 product line. Parts with and without the "-V" suffix maintain identical electrical and mechanical specifications, including isolation voltage, current transfer ratio, output characteristics, and operating temperature range. The suffix does not affect substitution compatibility.

Q: Are all EL817 variants ROHS3 compliant?

A: Yes. All Everlight EL817 variants listed as parametric equivalents are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating. Broadcom HCPL-817 series parts are also ROHS3 compliant.

Q: What is the difference between 4-SMD and Gull Wing packaging?

A: 4-SMD refers to the surface mount device configuration with four leads. Gull Wing describes the lead shape, where leads extend outward from the package body in a curved profile resembling a gull's wing. This is the standard lead configuration for 4-pin optoisolator packages and ensures compatibility with standard PCB footprints designed for this package type.

Q: Can I substitute based on current transfer ratio alone?

A: No. Current transfer ratio is one of multiple critical parameters. Substitution requires matching or exceeding all specified parameters: isolation voltage (5000Vrms), number of channels (1), output type (transistor), maximum output voltage (35V minimum), output current (50mA minimum), saturation voltage (200mV maximum), operating temperature range (-55°C ~ 110°C), and package configuration (4-SMD, Gull Wing). Parametric equivalents match all these specifications.

Q: What inventory levels are available for immediate procurement?

A: Parametric equivalents from Everlight range from 702 to 1112 pieces in stock. The Broadcom HCPL-817-30AE offers the highest availability with 20,200 pieces. For time-sensitive applications, HCPL-817-30AE provides the shortest procurement lead time due to inventory depth.

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