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LTV-817S-D Equivalent & Substitute Parts
Part Overview
The LTV-817S-D is an optoisolator with transistor output manufactured by Lite-On Inc., rated for 5000Vrms isolation voltage. This single-channel device operates in the -55°C to 110°C temperature range and is packaged in 4-SMD surface mount configuration. The part is active and ROHS3 compliant. Substitute parts are necessary when the original part is unavailable, when alternative current transfer ratio specifications are required for specific circuit requirements, or when different operating temperature ranges are needed for application-specific conditions.
Substiute Parts
Key Parameters
| Parameter | LTV-817S-D |
|---|---|
| Manufacturer | Lite-On Inc. |
| Isolation Voltage | 5000Vrms |
| Number of Channels | 1 |
| Output Type | Transistor |
| Current Transfer Ratio (Min) | 300% @ 5mA |
| Current Transfer Ratio (Max) | 600% @ 5mA |
| Voltage - Output (Max) | 35V |
| Current - Output / Channel | 50mA |
| Vce Saturation (Max) | 200mV |
| Operating Temperature | -55°C ~ 110°C |
| Package / Case | 4-SMD, Gull Wing |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts for the LTV-817S-D are selected from the Broadcom Limited HCPL-817 series based on the following criteria:
Critical Parameters (Must Match):
- Isolation Voltage: 5000Vrms
- Number of Channels: 1
- Output Type: Transistor
- Package / Case: 4-SMD, Gull Wing
- Input Type: DC
- Current - Output / Channel: 50mA
- Vce Saturation (Max): 200mV
- Voltage - Forward (Vf) (Typ): 1.2V
- Current - DC Forward (If) (Max): 50mA
- Rise / Fall Time (Typ): 4µs, 3µs
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level: 1 (Unlimited)
Variable Parameters (Allowed to Differ):
- Current Transfer Ratio (Min/Max): Different grades available
- Voltage - Output (Max): 70V (higher than original 35V)
- Operating Temperature Range: -30°C ~ 100°C (narrower than original)
- Packaging Format: Tube or Cut Tape (CT) & Digi-Reel®
The HCPL-817 series substitutes are grouped by current transfer ratio specification, which determines the device grade and application suitability.
Parameter Comparison
| Parameter | LTV-817S-D | HCPL-817-30DE | HCPL-817-36CE | HCPL-817-500E | HCPL-817-50AE | HCPL-817-50BE | HCPL-817-50CE | HCPL-817-50DE | HCPL-817-56AE | HCPL-817-56BE | HCPL-817-56CE |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Lite-On Inc. | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited |
| Isolation Voltage | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Output Type | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor |
| Current Transfer Ratio (Min) | 300% @ 5mA | 300% @ 5mA | 200% @ 5mA | 50% @ 5mA | 80% @ 5mA | 130% @ 5mA | 200% @ 5mA | 300% @ 5mA | 80% @ 5mA | 130% @ 5mA | 200% @ 5mA |
| Current Transfer Ratio (Max) | 600% @ 5mA | 600% @ 5mA | 400% @ 5mA | 600% @ 5mA | 160% @ 5mA | 260% @ 5mA | 400% @ 5mA | 600% @ 5mA | 160% @ 5mA | 260% @ 5mA | 400% @ 5mA |
| 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 |
| Vce Saturation (Max) | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV |
| 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 |
| 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 |
Engineering Selection Recommendations
All listed HCPL-817 series substitutes maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), ensuring compatibility with standard manufacturing and storage conditions. The primary selection criterion is current transfer ratio specification, which must align with circuit design requirements.
For applications requiring the original LTV-817S-D current transfer ratio range of 300-600% @ 5mA, direct substitutes are HCPL-817-30DE and HCPL-817-50DE, both offering identical CTR specifications.
For applications with relaxed current transfer ratio requirements, lower-grade alternatives such as HCPL-817-50AE (80-160%), HCPL-817-50BE (130-260%), or HCPL-817-50CE (200-400%) are available with higher inventory levels.
All substitute parts feature maximum output voltage of 70V, exceeding the original 35V specification, providing additional design margin for higher voltage applications. Operating temperature range for all substitutes is -30°C to 100°C, which is narrower than the original -55°C to 110°C range. Applications requiring extended temperature operation below -30°C or above 100°C must retain the LTV-817S-D.
Frequently Asked Questions (FAQ)
Q: Can HCPL-817 series parts directly replace LTV-817S-D in all applications?
A: Direct substitution is possible when operating temperature requirements fall within -30°C to 100°C and when the current transfer ratio specification of the selected HCPL-817 variant matches circuit design requirements. The higher maximum output voltage (70V vs. 35V) of HCPL-817 parts is compatible with LTV-817S-D applications.
Q: What is the significance of current transfer ratio grades in the HCPL-817 series?
A: Current transfer ratio (CTR) determines the optical coupling efficiency and output current capability for a given input current. Lower CTR grades (50-160%) require higher input currents to achieve the same output response. Higher CTR grades (300-600%) provide greater sensitivity and are suitable for low-input-current applications. Selection must match the circuit's input current availability and output current requirements.
Q: Are there packaging differences between LTV-817S-D and HCPL-817 substitutes?
A: LTV-817S-D is supplied in Tube packaging. HCPL-817 substitutes are available in Tube (HCPL-817-30DE, HCPL-817-36CE) or Cut Tape (CT) & Digi-Reel® formats (remaining variants). Both packaging formats are compatible with standard surface mount assembly processes.
Q: What is the impact of the narrower operating temperature range in HCPL-817 parts?
A: HCPL-817 series operates from -30°C to 100°C, compared to LTV-817S-D's -55°C to 110°C range. Applications requiring operation below -30°C or above 100°C must use the original LTV-817S-D or identify alternative parts with extended temperature specifications.
Q: How do I select the correct HCPL-817 variant for my application?
A: Identify the required current transfer ratio range based on your circuit's input current and desired output current. Match this requirement to the corresponding HCPL-817 grade: 50-600% (HCPL-817-500E), 80-160% (HCPL-817-50AE, HCPL-817-56AE), 130-260% (HCPL-817-50BE, HCPL-817-56BE), 200-400% (HCPL-817-36CE, HCPL-817-50CE, HCPL-817-56CE), or 300-600% (HCPL-817-30DE, HCPL-817-50DE).
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