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EL817(S)(TU) Equivalent & Substitute Parts
Part Overview
The EL817(S)(TU) is a 5000Vrms optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This single-channel, 4-SMD surface mount device provides galvanic isolation for DC input signals with transistor output capability. The component is active and in production with 1113 units currently in stock.
Substitute parts are necessary when the EL817(S)(TU) becomes unavailable, when alternative current transfer ratio grades are required for specific circuit performance, or when higher maximum output voltage ratings are needed. Broadcom Limited manufactures compatible alternatives within the HCPL-817 series that maintain core isolation and switching characteristics while offering different current transfer ratio specifications and extended output voltage ratings.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | EL817(S)(TU) |
| Manufacturer | Everlight Electronics Co Ltd |
| Category | Optoisolators |
| Number of Channels | 1 |
| Voltage - Isolation | 5000Vrms |
| Output Type | Transistor |
| Voltage - Output (Max) | 35V |
| Current - Output / Channel | 50mA |
| Rise / Fall Time (Typ) | 4µs, 3µs |
| 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) |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitution of the EL817(S)(TU) is determined by the following critical parameters:
Core Compatibility Requirements:
- Voltage - Isolation: 5000Vrms (all substitutes maintain this specification)
- Number of Channels: 1 (single channel configuration)
- Output Type: Transistor (all substitutes provide transistor output)
- Mounting Type: Surface Mount with 4-SMD, Gull Wing package
- Input Type: DC
- Rise / Fall Time: 4µs, 3µs (consistent across all parts)
- Vce Saturation (Max): 200mV (consistent across all parts)
- Voltage - Forward (Vf) (Typ): 1.2V (consistent across all parts)
- Current - Output / Channel: 50mA (consistent across all parts)
- RoHS Status: ROHS3 Compliant (all substitutes comply)
- Moisture Sensitivity Level (MSL): 1 (Unlimited) (all substitutes match)
Variable Parameters Defining Substitute Grades:
- Current Transfer Ratio (Min/Max): Varies by part number suffix
- Voltage - Output (Max): EL817(S)(TU) rated at 35V; Broadcom HCPL-817 series rated at 70V
- Operating Temperature Range: EL817(S)(TU) operates -55°C ~ 110°C; Broadcom substitutes operate -30°C ~ 100°C
The Broadcom HCPL-817 series substitutes are grouped by current transfer ratio performance grade, designated by suffix letters (A, B, C, D). The EL817(S)(TU) with 50% to 600% CTR range corresponds to the HCPL-817-500E and HCPL-817-50DE variants. Alternative CTR grades (HCPL-817-50AE, HCPL-817-50BE, HCPL-817-50CE, HCPL-817-56AE, HCPL-817-56BE, HCPL-817-56CE) provide narrower CTR specifications for applications requiring tighter gain control. The HCPL-817-30DE and HCPL-817-36CE variants offer intermediate CTR specifications.
Parameter Comparison
| Parameter | EL817(S)(TU) | HCPL-817-500E | HCPL-817-50AE | HCPL-817-50BE | HCPL-817-50CE | HCPL-817-50DE | HCPL-817-30DE | HCPL-817-36CE | HCPL-817-56AE | HCPL-817-56BE | HCPL-817-56CE |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Everlight | Broadcom | Broadcom | Broadcom | Broadcom | Broadcom | Broadcom | Broadcom | Broadcom | Broadcom | Broadcom |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Isolation | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms |
| Current Transfer Ratio (Min) @ 5mA | 50% | 50% | 80% | 130% | 200% | 300% | 300% | 200% | 80% | 130% | 200% |
| Current Transfer Ratio (Max) @ 5mA | 600% | 600% | 160% | 260% | 400% | 600% | 600% | 400% | 160% | 260% | 400% |
| Voltage - Output (Max) | 35V | 70V | 70V | 70V | 70V | 70V | 70V | 70V | 70V | 70V | 70V |
| Current - Output / Channel | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA |
| Rise / Fall Time (Typ) | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs |
| Vce Saturation (Max) | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV |
| Voltage - Forward (Vf) (Typ) | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V |
| Operating Temperature | -55°C ~ 110°C | -30°C ~ 100°C | -30°C ~ 100°C | -30°C ~ 100°C | -30°C ~ 100°C | -30°C ~ 100°C | -30°C ~ 100°C | -30°C ~ 100°C | -30°C ~ 100°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 | 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 | 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 | 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) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Direct Equivalents (Identical CTR Range):
HCPL-817-500E and HCPL-817-50DE are direct functional equivalents to the EL817(S)(TU), maintaining the 50% to 600% current transfer ratio specification. Both parts are manufactured by Broadcom Limited and are ROHS3 compliant with MSL 1 rating. HCPL-817-500E is available in Cut Tape (CT) & Digi-Reel packaging with 12500 units in stock. HCPL-817-50DE is available in Cut Tape (CT) & Digi-Reel packaging with 5600 units in stock. Both provide 70V maximum output voltage compared to the EL817(S)(TU) 35V rating, offering enhanced voltage headroom for higher-voltage switching applications.
CTR-Optimized Alternatives:
HCPL-817-50AE and HCPL-817-56AE provide narrower CTR specifications (80% to 160%) for applications requiring tighter gain control and reduced CTR variation. HCPL-817-50BE and HCPL-817-56BE offer intermediate CTR (130% to 260%) for moderate gain applications. HCPL-817-50CE and HCPL-817-56CE provide CTR specifications (200% to 400%) suitable for high-gain applications. HCPL-817-30DE and HCPL-817-36CE offer alternative CTR grades (300% to 600% and 200% to 400% respectively) for specific circuit requirements.
Temperature Range Consideration:
The EL817(S)(TU) operates across -55°C to 110°C, while all Broadcom HCPL-817 substitutes operate across -30°C to 100°C. Applications requiring operation below -30°C or above 100°C must retain the EL817(S)(TU). For applications within the -30°C to 100°C range, Broadcom substitutes are fully compatible.
Packaging and Availability:
All substitute parts maintain the 4-SMD, Gull Wing surface mount package. Broadcom parts are available in Cut Tape (CT) & Digi-Reel or Tube packaging. Selection between packaging options depends on assembly process requirements and volume needs.
Frequently Asked Questions (FAQ)
Q: Can HCPL-817-500E directly replace EL817(S)(TU) in existing designs?
A: Yes. HCPL-817-500E maintains identical isolation voltage (5000Vrms), current transfer ratio range (50% to 600%), output current (50mA), switching speed (4µs rise, 3µs fall), and saturation voltage (200mV). Both are ROHS3 compliant with MSL 1 rating. The primary difference is maximum output voltage: HCPL-817-500E is rated 70V versus EL817(S)(TU) 35V. Operating temperature range differs: HCPL-817-500E operates -30°C to 100°C versus EL817(S)(TU) -55°C to 110°C. For applications within -30°C to 100°C, HCPL-817-500E is a direct substitute.
Q: What is the difference between HCPL-817-50DE and HCPL-817-500E?
A: Both parts share identical electrical specifications: 5000Vrms isolation, 50% to 600% CTR, 70V maximum output voltage, 50mA output current, 4µs/3µs rise/fall time, and 200mV saturation voltage. The primary difference is packaging: HCPL-817-500E is supplied in Cut Tape (CT) & Digi-Reel format with 12500 units in stock, while HCPL-817-50DE is supplied in Cut Tape (CT) & Digi-Reel format with 5600 units in stock. Both are suitable for identical applications.
Q: Which substitute should I select for applications requiring tight current transfer ratio control?
A: HCPL-817-50AE and HCPL-817-56AE provide the narrowest CTR specification (80% to 160%), offering the tightest gain control with 80% variation. HCPL-817-50BE and HCPL-817-56BE provide intermediate CTR control (130% to 260%) with 130% variation. HCPL-817-50CE and HCPL-817-56CE provide CTR (200% to 400%) with 200% variation. The EL817(S)(TU) and direct equivalents (HCPL-817-500E, HCPL-817-50DE) provide the widest CTR range (50% to 600%) with 550% variation, suitable for applications tolerating broad gain variation.
Q: Are all substitute parts RoHS compliant?
A: Yes. All listed substitute parts (HCPL-817 series from Broadcom Limited) are ROHS3 compliant. The EL817(S)(TU) is also ROHS3 compliant. All parts carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no special moisture handling requirements during storage or assembly.
Q: What is the impact of the 70V maximum output voltage on HCPL-817 substitutes compared to EL817(S)(TU) 35V?
A: The 70V maximum output voltage rating on Broadcom HCPL-817 substitutes provides enhanced voltage headroom for switching higher-voltage loads compared to the EL817(S)(TU) 35V rating. This allows the substitute parts to operate in applications with higher collector-emitter voltages without exceeding device ratings. For applications operating below 35V, both the original and substitute parts are equally suitable. For applications requiring 35V to 70V switching capability, Broadcom substitutes provide additional design margin.
Q: Can I use HCPL-817 substitutes in applications requiring -55°C operation?
A: No. Broadcom HCPL-817 substitutes are rated for -30°C to 100°C operation. Applications requiring operation at -55°C must use the EL817(S)(TU), which is rated -55°C to 110°C. For applications operating within -30°C to 100°C, Broadcom substitutes are fully compatible.
Q: What is the difference between the "50" and "56" suffix variants in the HCPL-817 series?
A: The "50" and "56" suffixes designate different packaging or lead configurations within the HCPL-817 series. Both variants maintain identical electrical specifications for corresponding CTR grades (e.g., HCPL-817-50AE and HCPL-817-56AE both provide 80% to 160% CTR). Selection between "50" and "56" variants depends on specific PCB layout requirements and assembly process compatibility. Consult Broadcom datasheets for detailed package dimension specifications.
Q: Are HCPL-817-30DE and HCPL-817-36CE suitable substitutes for EL817(S)(TU)?
A: HCPL-817-30DE and HCPL-817-36CE maintain core compatibility with EL817(S)(TU) in isolation voltage (5000Vrms), output type (transistor), switching speed (4µs/3µs), and saturation voltage (200mV). However, these parts provide different current transfer ratio specifications: HCPL-817-30DE offers 300% to 600% CTR, and HCPL-817-36CE offers 200% to 400% CTR. These variants are suitable for applications where the narrower CTR range is acceptable or beneficial for circuit performance. For applications requiring the full 50% to 600% CTR range of the original EL817(S)(TU), HCPL-817-500E or HCPL-817-50DE are more appropriate selections.
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