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FOD617ASD Optoisolator Equivalent & Substitute Parts
Part Overview
The FOD617ASD is a single-channel optoisolator with transistor output manufactured by onsemi, rated for 5000Vrms isolation voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The FOD617ASD operates across a temperature range of -55°C to 110°C and is packaged in 4-SMD surface mount configuration with gull wing leads.
Substiute Parts
Key Parameters
| Parameter | FOD617ASD |
|---|---|
| Manufacturer | onsemi |
| Number of Channels | 1 |
| Voltage - Isolation | 5000Vrms |
| Current Transfer Ratio (Min) | 40% @ 10mA |
| Current Transfer Ratio (Max) | 80% @ 10mA |
| Output Type | Transistor |
| Voltage - Output (Max) | 70V |
| Current - Output / Channel | 50mA |
| Vce Saturation (Max) | 400mV |
| Operating Temperature | -55°C ~ 110°C |
| Package / Case | 4-SMD, Gull Wing |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the FOD617ASD is determined by the following critical parameters:
- Isolation Voltage: Minimum 5000Vrms required for direct replacement
- Number of Channels: Must be 1 channel
- Output Type: Transistor output configuration
- Package / Case: 4-SMD, Gull Wing surface mount
- Current - Output / Channel: 50mA capability
- Voltage - Output (Max): 70V maximum
- Vce Saturation (Max): 400mV maximum
Substitute parts are grouped into two categories based on isolation voltage specification:
Category A - 5000Vrms Isolation (Direct Electrical Equivalents):
- VO615A-1X007T (Vishay Semiconductor Opto Division)
Category B - 5300Vrms Isolation (Enhanced Isolation Rating):
- SFH615A-2XSMT&R (Isocom Components 2004 LTD)
- SFH615A-3XSMT&R (Isocom Components 2004 LTD)
- SFH615A-4XSM (Isocom Components 2004 LTD)
- SFH615A-4XSMT&R (Isocom Components 2004 LTD)
Category C - Different Isolation Specification (Not Recommended for Direct Replacement):
- SFH617A-2XSMT&R (Isocom Components 2004 LTD) - 7.5Vpk isolation
- SFH617A-3XSMT&R (Isocom Components 2004 LTD) - 7.5Vpk isolation
Parameter Comparison
| Parameter | FOD617ASD | VO615A-1X007T | SFH615A-2XSMT&R | SFH615A-3XSMT&R | SFH615A-4XSM | SFH615A-4XSMT&R |
|---|---|---|---|---|---|---|
| Manufacturer | onsemi | Vishay Semiconductor Opto Division | Isocom Components 2004 LTD | Isocom Components 2004 LTD | Isocom Components 2004 LTD | Isocom Components 2004 LTD |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Isolation | 5000Vrms | 5000Vrms | 5300Vrms | 5300Vrms | 5300Vrms | 5300Vrms |
| Current Transfer Ratio (Min) | 40% @ 10mA | 40% @ 10mA | 63% @ 10mA | 100% @ 10mA | 160% @ 10mA | 160% @ 10mA |
| Current Transfer Ratio (Max) | 80% @ 10mA | 80% @ 10mA | 125% @ 10mA | 200% @ 10mA | 320% @ 10mA | 320% @ 10mA |
| Output Type | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor |
| Voltage - Output (Max) | 70V | 70V | 70V | 70V | 70V | 70V |
| Current - Output / Channel | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA |
| Vce Saturation (Max) | 400mV | 300mV | 400mV | 400mV | 400mV | 400mV |
| Operating Temperature | -55°C ~ 110°C | -55°C ~ 110°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 |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Product Status | Obsolete | Active | Active | Active | Active | Active |
| RoHS Status | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: VO615A-1X007T
The VO615A-1X007T from Vishay Semiconductor Opto Division is the closest electrical equivalent to the FOD617ASD. Both parts share identical isolation voltage (5000Vrms), current transfer ratio specifications (40-80% @ 10mA), and operating temperature range (-55°C to 110°C). The VO615A-1X007T is currently in active production status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The Vce saturation specification is superior (300mV vs 400mV), providing better performance characteristics.
Secondary Recommendation: SFH615A Series (Isocom Components 2004 LTD)
The SFH615A series optoisolators provide enhanced isolation voltage (5300Vrms) compared to the FOD617ASD specification. These parts are available in multiple current transfer ratio grades:
- SFH615A-2XSMT&R: 63-125% CTR, suitable for applications requiring moderate current transfer
- SFH615A-3XSMT&R: 100-200% CTR, suitable for standard applications
- SFH615A-4XSM and SFH615A-4XSMT&R: 160-320% CTR, suitable for high-speed switching applications
All SFH615A variants are ROHS3 compliant and in active production. The reduced operating temperature range (-30°C to 100°C) must be evaluated against application requirements if operation below -30°C is necessary.
Not Recommended for Direct Replacement: SFH617A Series
The SFH617A-2XSMT&R and SFH617A-3XSMT&R feature significantly different isolation voltage specification (7.5Vpk), which does not meet the 5000Vrms isolation requirement of the FOD617ASD. These parts are suitable only for applications with different isolation voltage requirements.
Frequently Asked Questions (FAQ)
Q: Can I use SFH615A parts as direct replacements for FOD617ASD?
A: SFH615A parts meet all critical electrical and mechanical parameters for substitution. The enhanced isolation voltage (5300Vrms vs 5000Vrms) provides additional safety margin. However, the reduced operating temperature range (-30°C to 100°C vs -55°C to 110°C) must be verified against application requirements. If operation below -30°C or above 100°C is required, use VO615A-1X007T instead.
Q: What is the difference between SFH615A-2, SFH615A-3, and SFH615A-4 variants?
A: These variants differ in current transfer ratio (CTR) specification. SFH615A-2 provides 63-125% CTR, SFH615A-3 provides 100-200% CTR, and SFH615A-4 provides 160-320% CTR. Selection depends on the required input-to-output current transfer characteristics for your specific application circuit.
Q: Are all substitute parts available in the same packaging?
A: All recommended substitute parts use 4-SMD, Gull Wing surface mount packaging identical to the FOD617ASD. Packaging variants differ in tape and reel (TR) or tube configurations. Verify the specific packaging requirement (TR vs tube) for your procurement and assembly process.
Q: What is the significance of the obsolete status of FOD617ASD?
A: The obsolete status indicates that onsemi has discontinued production of this part. All recommended substitutes are in active production status, ensuring long-term availability and supply chain continuity for new designs and production runs.
Q: Do all substitute parts meet RoHS compliance?
A: VO615A-1X007T and all SFH615A variants are ROHS3 compliant. The original FOD617ASD does not specify RoHS status. If RoHS compliance is a design requirement, all recommended substitutes satisfy this requirement.
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