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EL815(S)(TB) Optoisolator Equivalent & Substitute Parts
Part Overview
The EL815(S)(TB) is a 5000Vrms isolation Darlington output optoisolator manufactured by Everlight Electronics Co Ltd in 4-SMD surface mount package. This component is discontinued at DiGi Electronics but remains available through inventory stock of 1113 pieces. The part functions as a single-channel DC input optoisolator with Darlington output configuration, suitable for high-voltage isolation applications requiring 5kV isolation rating.
Due to the discontinued status of EL815(S)(TB), equivalent substitute parts from the same manufacturer and cross-compatible alternatives from Lite-On Inc. are available to maintain design continuity and ensure supply chain reliability.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Everlight Electronics Co Ltd |
| Category | Optoisolators |
| Number of Channels | 1 |
| Voltage - Isolation | 5000Vrms |
| Current Transfer Ratio (Min) | 600% @ 1mA |
| Current Transfer Ratio (Max) | 7500% @ 1mA |
| Output Type | Darlington |
| Voltage - Output (Max) | 35V |
| Current - Output / Channel | 80mA |
| Vce Saturation (Max) | 1V |
| Rise / Fall Time (Typ) | 60µs, 53µs |
| Input Type | DC |
| Voltage - Forward (Vf) (Typ) | 1.2V |
| Current - DC Forward (If) (Max) | 60 mA |
| 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 EL815(S)(TB) are classified into two categories based on parametric equivalence and manufacturer compatibility:
Category 1: Parametric Equivalents (Everlight Electronics Co Ltd)
The following parts maintain identical electrical and mechanical specifications to the EL815(S)(TB):
- EL815(S)(TD)
- EL815(S)(TD)-V
- EL815(S)(TU)
- EL815(S)(TU)-V
- EL815(S1)(TD)
- EL815(S1)(TD)-V
- EL815(S1)(TU)
- EL815(S1)(TU)-V
These substitutes share the same base product number EL815 and are differentiated by suffix designations indicating packaging tape configuration (TD, TU) and voltage grade variants (-V suffix). All maintain 5000Vrms isolation, 600%-7500% current transfer ratio range, 35V maximum output voltage, 80mA output current, and identical thermal operating range of -55°C to 110°C. The key distinction is product status: all listed equivalents are Active, whereas the main part EL815(S)(TB) is Discontinued.
Category 2: Similar Cross-Manufacturer Alternatives (Lite-On Inc.)
The following parts provide functional equivalence from an alternative manufacturer:
- LTV-815S
- LTV-815S-TA
These Lite-On components maintain the same 5000Vrms isolation rating, 600%-7500% current transfer ratio, Darlington output configuration, 35V maximum output voltage, and 80mA output current. Differences exist in operating temperature range (LTV series: -30°C to 100°C versus EL815 series: -55°C to 110°C) and maximum DC forward current (LTV-815S and LTV-815S-TA: 50mA versus EL815(S)(TB): 60mA). Both Lite-On parts are Active status with higher inventory availability (2990 and 1025 pieces respectively).
Substitution eligibility is determined by matching: isolation voltage (5000Vrms), number of channels (1), output type (Darlington), maximum output voltage (35V), output current capability (80mA), input type (DC), package configuration (4-SMD Gull Wing), and compliance certifications (ROHS3).
Parameter Comparison
| Parameter | EL815(S)(TB) | EL815(S)(TD) | EL815(S)(TU) | EL815(S1)(TD) | EL815(S1)(TU) | LTV-815S | LTV-815S-TA |
|---|---|---|---|---|---|---|---|
| Manufacturer | Everlight | Everlight | Everlight | Everlight | Everlight | Lite-On | Lite-On |
| Product Status | Discontinued | Active | Active | Active | Active | Active | Active |
| Voltage - Isolation | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Current Transfer Ratio (Min) | 600% @ 1mA | 600% @ 1mA | 600% @ 1mA | 600% @ 1mA | 600% @ 1mA | 600% @ 1mA | 600% @ 1mA |
| Current Transfer Ratio (Max) | 7500% @ 1mA | 7500% @ 1mA | 7500% @ 1mA | 7500% @ 1mA | 7500% @ 1mA | 7500% @ 1mA | 7500% @ 1mA |
| Output Type | Darlington | Darlington | Darlington | Darlington | Darlington | Darlington | Darlington |
| Voltage - Output (Max) | 35V | 35V | 35V | 35V | 35V | 35V | 35V |
| Current - Output / Channel | 80mA | 80mA | 80mA | 80mA | 80mA | 80mA | 80mA |
| Vce Saturation (Max) | 1V | 1V | 1V | 1V | 1V | 1V | 1V |
| Rise / Fall Time (Typ) | 60µs, 53µs | 60µs, 53µs | 60µs, 53µs | 60µs, 53µs | 60µs, 53µs | 60µs, 53µs | 60µs, 53µs |
| Input Type | DC | DC | DC | DC | DC | DC | DC |
| Voltage - Forward (Vf) (Typ) | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V |
| Current - DC Forward (If) (Max) | 60 mA | 60 mA | 60 mA | 60 mA | 60 mA | 50 mA | 50 mA |
| Operating Temperature | -55°C ~ 110°C | -55°C ~ 110°C | -55°C ~ 110°C | -55°C ~ 110°C | -55°C ~ 110°C | -30°C ~ 100°C | -30°C ~ 100°C |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 4-SMD, Gull Wing | 4-SMD, Gull Wing | 4-SMD, Gull Wing | 4-SMD, Gull Wing | 4-SMD, Gull Wing | 4-SMD, Gull Wing | 4-SMD, Gull Wing |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Inventory Status | 1113 Pcs | 1145 Pcs | 863 Pcs | 1134 Pcs | 1139 Pcs | 2990 Pcs | 1025 Pcs |
Engineering Selection Recommendations
For Everlight Electronics Co Ltd Substitutes (EL815 Series)
The eight parametric equivalent parts from Everlight (EL815(S)(TD), EL815(S)(TD)-V, EL815(S)(TU), EL815(S)(TU)-V, EL815(S1)(TD), EL815(S1)(TD)-V, EL815(S1)(TU), EL815(S1)(TU)-V) provide direct functional replacement for the discontinued EL815(S)(TB). All maintain identical electrical specifications and thermal operating range (-55°C to 110°C). These parts carry Active product status with inventory availability ranging from 734 to 1145 pieces. All are ROHS3 compliant with MSL rating of 1 (Unlimited). Selection among these variants should be based on specific tape configuration requirements (TD or TU designations) and voltage grade specifications (-V suffix variants). These substitutes are recommended as primary alternatives due to identical parametric matching and same-manufacturer sourcing.
For Lite-On Inc. Cross-Manufacturer Alternatives (LTV-815 Series)
The LTV-815S and LTV-815S-TA from Lite-On Inc. provide functional equivalence with two parameter deviations: operating temperature range (-30°C to 100°C versus -55°C to 110°C) and maximum DC forward current (50mA versus 60mA). These parts are suitable for applications where the narrower temperature range and reduced forward current specification do not conflict with design requirements. Both Lite-On alternatives carry Active product status with higher inventory availability (2990 and 1025 pieces respectively). Both are ROHS3 compliant with MSL rating of 1 (Unlimited). LTV-815S-TA includes documented cross-compatibility with FOD8523SD and FOD8523S optoisolators. Selection of Lite-On alternatives is appropriate when supply chain diversification is required or when application thermal and current specifications align with the narrower operating parameters.
Frequently Asked Questions (FAQ)
Q: Can EL815(S)(TD) directly replace EL815(S)(TB) in existing designs?
A: Yes. EL815(S)(TD) maintains identical electrical specifications including 5000Vrms isolation, 600%-7500% current transfer ratio, 35V maximum output voltage, 80mA output current, and -55°C to 110°C operating temperature range. The primary difference is product status (Active versus Discontinued). Tape configuration differences (TD versus TB suffix) relate to packaging and handling but do not affect electrical performance or PCB footprint compatibility in 4-SMD Gull Wing configuration.
Q: What are the differences between Everlight EL815 variants and Lite-On LTV-815 alternatives?
A: Everlight EL815 series and Lite-On LTV-815 series share identical isolation voltage (5000Vrms), current transfer ratio (600%-7500%), output configuration (Darlington), maximum output voltage (35V), and output current (80mA). Two parameter differences exist: (1) Operating temperature range—EL815 series supports -55°C to 110°C while LTV-815 series supports -30°C to 100°C; (2) Maximum DC forward current—EL815 series specifies 60mA while LTV-815 series specifies 50mA. Both are ROHS3 compliant with MSL 1 rating and 4-SMD Gull Wing package configuration.
Q: Is the LTV-815S suitable for applications requiring -55°C minimum operating temperature?
A: No. LTV-815S specifies a minimum operating temperature of -30°C. Applications requiring operation at -55°C must use Everlight EL815 series substitutes, which support the full -55°C to 110°C range. Verify application thermal requirements before selecting between Everlight and Lite-On alternatives.
Q: Are all EL815 variants (TD, TU, with and without -V suffix) electrically identical?
A: Yes. All eight Everlight EL815 variants listed maintain identical electrical specifications. Suffix designations (TD, TU, -V) indicate tape configuration and voltage grade variants used in manufacturing and packaging processes but do not affect electrical performance, isolation rating, current transfer ratio, output voltage/current specifications, or thermal operating range.
Q: What is the significance of the -V suffix in EL815(S)(TD)-V and similar part numbers?
A: The -V suffix indicates a voltage grade variant. However, the provided specifications for -V and non-V variants are electrically identical across all measured parameters. Consult manufacturer datasheets for specific voltage grade distinctions if critical to application requirements.
Q: Can I substitute LTV-815S-TA if my design currently uses EL815(S)(TB)?
A: Substitution is possible if application requirements align with LTV-815S-TA specifications. Verify: (1) Operating temperature range does not require below -30°C operation; (2) Maximum DC forward current of 50mA is sufficient (versus 60mA for EL815 series); (3) 4-SMD Gull Wing package footprint compatibility. If all conditions are met, LTV-815S-TA provides functional equivalence with higher inventory availability.
Q: What compliance certifications apply to all listed substitute parts?
A: All substitute parts (Everlight EL815 series and Lite-On LTV-815 series) are ROHS3 compliant and carry Moisture Sensitivity Level (MSL) rating of 1 (Unlimited). All are classified under ECCN EAR99 and HTSUS 8541.49.8000. Lite-On LTV-815S additionally carries REACH Unaffected status.
Q: Which substitute part has the highest current inventory availability?
A: LTV-815S from Lite-On Inc. has the highest inventory availability at 2990 pieces. Among Everlight EL815 series substitutes, EL815(S)(TD) has the highest availability at 1145 pieces.
Q: Are there any mechanical or footprint differences between EL815(S)(TB) and its substitutes?
A: No. All listed substitutes maintain identical mounting type (Surface Mount), package configuration (4-SMD, Gull Wing), and supplier device package specification (4-SMD). PCB footprint and assembly compatibility are identical across all parts.
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