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EL817(S)(TA) Equivalent & Substitute Parts
Part Overview
The EL817(S)(TA) is a 5000Vrms optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This component provides galvanic isolation in single-channel applications with 4-SMD surface mount packaging. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent alternatives from active product lines. Substitute parts must maintain identical electrical isolation, output characteristics, and mechanical compatibility for direct circuit board replacement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Isolation | 5000Vrms |
| Number of Channels | 1 |
| Output Type | Transistor |
| Current Transfer Ratio (Min) | 50% @ 5mA |
| Current Transfer Ratio (Max) | 600% @ 5mA |
| Voltage - Output (Max) | 35V |
| Current - Output / Channel | 50mA |
| Vce Saturation (Max) | 200mV |
| Rise / Fall Time (Typ) | 4µs, 3µs |
| Operating Temperature | -55°C ~ 110°C |
| Package / Case | 4-SMD, Gull Wing |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the EL817(S)(TA) is determined by strict equivalence across the following critical parameters:
Mandatory Equivalence Criteria:
- Voltage - Isolation: 5000Vrms
- Number of Channels: 1
- Output Type: Transistor
- Package / Case: 4-SMD, Gull Wing
- Current Transfer Ratio range: 50% to 600% @ 5mA
- Voltage - Output (Max): 35V minimum
- Current - Output / Channel: 50mA minimum
- Vce Saturation (Max): 200mV
- Rise / Fall Time: 4µs, 3µs
Substitute parts are grouped into two categories:
Parametric Equivalents (Everlight EL817 Series): Parts with identical electrical specifications and active product status. These include EL817(S)(TD), EL817(S)(TD)-V, EL817(S)(TU), EL817(S)(TU)-V, EL817(S1)(TD), EL817(S1)(TD)-V, EL817(S1)(TU), and EL817(S1)(TU)-V. All maintain the same isolation voltage, output characteristics, and thermal range as the main part.
Similar Parts (Broadcom HCPL-817 Series): Parts with equivalent isolation voltage and output type but with parameter variations. HCPL-817-300E and HCPL-817-30AE differ in maximum output voltage (70V vs. 35V) and operating temperature range (-30°C ~ 100°C vs. -55°C ~ 110°C). These parts are suitable only when circuit design accommodates the parameter differences.
Parameter Comparison
| Part Number | Manufacturer | Isolation Voltage | CTR Min @ 5mA | CTR Max @ 5mA | Vout Max | Iout / Channel | Vce Sat Max | Temp Range | Status |
|---|---|---|---|---|---|---|---|---|---|
| EL817(S)(TA) | Everlight | 5000Vrms | 50% | 600% | 35V | 50mA | 200mV | -55°C ~ 110°C | Discontinued |
| EL817(S)(TD) | Everlight | 5000Vrms | 50% | 600% | 35V | 50mA | 200mV | -55°C ~ 110°C | Active |
| EL817(S)(TD)-V | Everlight | 5000Vrms | 50% | 600% | 35V | 50mA | 200mV | -55°C ~ 110°C | Active |
| EL817(S)(TU) | Everlight | 5000Vrms | 50% | 600% | 35V | 50mA | 200mV | -55°C ~ 110°C | Active |
| EL817(S)(TU)-V | Everlight | 5000Vrms | 50% | 600% | 35V | 50mA | 200mV | -55°C ~ 110°C | Active |
| EL817(S1)(TD) | Everlight | 5000Vrms | 50% | 600% | 35V | 50mA | 200mV | -55°C ~ 110°C | Active |
| EL817(S1)(TD)-V | Everlight | 5000Vrms | 50% | 600% | 35V | 50mA | 200mV | -55°C ~ 110°C | Active |
| EL817(S1)(TU) | Everlight | 5000Vrms | 50% | 600% | 35V | 50mA | 200mV | -55°C ~ 110°C | Active |
| EL817(S1)(TU)-V | Everlight | 5000Vrms | 50% | 600% | 35V | 50mA | 200mV | -55°C ~ 110°C | Active |
| HCPL-817-300E | Broadcom | 5000Vrms | 50% | 600% | 70V | 50mA | 200mV | -30°C ~ 100°C | Active |
| HCPL-817-30AE | Broadcom | 5000Vrms | 80% | 160% | 70V | 50mA | 200mV | -30°C ~ 100°C | Active |
Engineering Selection Recommendations
Primary Substitutes (Everlight EL817 Series):
The Everlight EL817(S)(TD), EL817(S)(TD)-V, EL817(S)(TU), EL817(S)(TU)-V, EL817(S1)(TD), EL817(S1)(TD)-V, EL817(S1)(TU), and EL817(S1)(TU)-V are direct parametric equivalents with active product status. All maintain identical electrical specifications, thermal operating range (-55°C ~ 110°C), and 4-SMD package configuration. These parts are suitable for direct replacement without circuit modification. Selection among these variants depends on internal packaging differences (TD vs. TU designations) and tape/reel availability (-V suffix indicates tape/reel packaging).
Secondary Substitutes (Broadcom HCPL-817 Series):
HCPL-817-300E and HCPL-817-30AE are functionally equivalent in isolation voltage and output type but differ in maximum output voltage (70V vs. 35V) and operating temperature range (-30°C ~ 100°C vs. -55°C ~ 110°C). These parts are suitable only when circuit design does not require the full -55°C lower temperature limit and when the higher output voltage rating does not create design conflicts. HCPL-817-30AE exhibits a narrower current transfer ratio range (80% to 160% @ 5mA) compared to the EL817 series (50% to 600% @ 5mA), which may affect circuit gain characteristics.
Compliance Considerations:
All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, consistent with the original EL817(S)(TA). All parts carry EAR99 ECCN classification and HTSUS code 8541.49.8000.
Frequently Asked Questions (FAQ)
Q: Can EL817(S)(TD) directly replace EL817(S)(TA) on the circuit board?
A: Yes. EL817(S)(TD) is a parametric equivalent with identical electrical specifications, isolation voltage (5000Vrms), output characteristics (35V max, 50mA), and 4-SMD Gull Wing package. The part is active and in stock, making it a direct replacement.
Q: What is the difference between EL817(S)(TD) and EL817(S)(TU)?
A: Both parts have identical electrical specifications. The difference lies in internal packaging configuration (TD vs. TU designations). Selection depends on tape/reel availability and internal component binning. Electrical performance is equivalent.
Q: Can HCPL-817-300E replace EL817(S)(TA)?
A: HCPL-817-300E is functionally compatible but with parameter differences. It provides the same 5000Vrms isolation and 50mA output current. However, it has a higher maximum output voltage (70V vs. 35V) and narrower operating temperature range (-30°C ~ 100°C vs. -55°C ~ 110°C). Use only if circuit design accommodates these differences and does not require operation below -30°C.
Q: Why does HCPL-817-30AE have a different current transfer ratio range?
A: HCPL-817-30AE is specified with 80% to 160% CTR @ 5mA, compared to 50% to 600% for the EL817 series. This narrower range reflects different internal component selection and binning by Broadcom. Circuit designs relying on the full CTR range of the EL817 series should not use HCPL-817-30AE.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) rating, consistent with the original EL817(S)(TA).
Q: What does the -V suffix indicate on EL817 part numbers?
A: The -V suffix indicates tape/reel packaging format. Parts without the -V suffix use alternative packaging. Electrical specifications are identical; selection depends on procurement and assembly requirements.
Q: Can I use HCPL-817-300E in applications requiring -55°C operation?
A: No. HCPL-817-300E is specified for -30°C ~ 100°C operating range. For applications requiring -55°C minimum temperature, use Everlight EL817 series variants, which are rated -55°C ~ 110°C.
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