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ILQ1 Equivalent & Substitute Parts
Part Overview
The ILQ1 is a 4-channel optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. It provides 5300Vrms isolation voltage in a 16-DIP through-hole package. The ILQ1 is designated as Last Time Buy, indicating discontinued production status. Alternative equivalent parts are necessary for new designs and ongoing procurement requirements where the original part is no longer available from the manufacturer.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | ILQ1 |
| Category | Optoisolators |
| Number of Channels | 4 |
| Voltage - Isolation | 5300Vrms |
| Output Type | Transistor |
| Voltage - Output (Max) | 50V |
| Current - Output / Channel | 50mA |
| Current Transfer Ratio (Min) | 20% @ 10mA |
| Current Transfer Ratio (Max) | 300% @ 10mA |
| Package / Case | 16-DIP (0.300", 7.62mm) |
| Operating Temperature | -40°C ~ 100°C |
| Mounting Type | Through Hole |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the ILQ1 is determined by the following critical parameters:
- Isolation Voltage: 5300Vrms (exact match required)
- Output Type: Transistor output configuration
- Package / Case: 16-DIP (0.300", 7.62mm) through-hole mounting
- Current Transfer Ratio Range: 20% to 300% @ 10mA
- Maximum Output Voltage: 50V
- Maximum Output Current per Channel: 50mA
- Input Type: DC
- RoHS Compliance: ROHS3 Compliant
The ILQ1X from Isocom Components 2004 LTD meets the core electrical and mechanical substitution criteria. However, a critical difference exists in channel configuration: the ILQ1X provides 1 channel versus the ILQ1's 4 channels. This difference affects circuit-level integration and board layout requirements.
Parameter Comparison
| Parameter | ILQ1 (Vishay) | ILQ1X (Isocom) |
|---|---|---|
| Manufacturer | Vishay Semiconductor Opto Division | Isocom Components 2004 LTD |
| Number of Channels | 4 | 1 |
| Voltage - Isolation | 5300Vrms | 5300Vrms |
| Current Transfer Ratio (Min) | 20% @ 10mA | 20% @ 10mA |
| Current Transfer Ratio (Max) | 300% @ 10mA | 300% @ 10mA |
| Voltage - Output (Max) | 50V | 50V |
| Current - Output / Channel | 50mA | 50mA |
| Voltage - Forward (Vf) (Typ) | 1.25V | 1.2V |
| Current - DC Forward (If) (Max) | 60mA | 50mA |
| Vce Saturation (Max) | 400mV | 400mV |
| Operating Temperature | -40°C ~ 100°C | -25°C ~ 100°C |
| Package / Case | 16-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Last Time Buy | Active |
Engineering Selection Recommendations
ILQ1 (Vishay Semiconductor Opto Division): This is the original manufacturer part. Product status is Last Time Buy, indicating end-of-life status. Existing inventory of 4336 pieces is available. This part remains the primary reference for electrical and mechanical specifications.
ILQ1X (Isocom Components 2004 LTD): This part maintains active product status and shares identical isolation voltage, output type, and package configuration with the ILQ1. Electrical parameters for current transfer ratio, output voltage, and saturation voltage are equivalent. The operating temperature range is narrower (-25°C to 100°C versus -40°C to 100°C). The critical distinction is the single-channel configuration versus the ILQ1's four-channel design. Selection of the ILQ1X requires circuit redesign to accommodate the reduced channel count per package, necessitating multiple ILQ1X devices where a single ILQ1 was previously used. Both parts are ROHS3 compliant and carry identical compliance certifications.
Frequently Asked Questions (FAQ)
Q: Can the ILQ1X directly replace the ILQ1 in existing designs?
A: Electrical substitution is possible for individual channel isolation requirements. However, the ILQ1X provides only 1 channel per package versus the ILQ1's 4 channels. Direct pin-for-pin replacement is not feasible. Circuit redesign is required to accommodate the reduced channel density.
Q: What are the key electrical parameters that determine substitution compatibility?
A: Isolation voltage (5300Vrms), output type (transistor), current transfer ratio range (20% to 300% @ 10mA), maximum output voltage (50V), and maximum output current per channel (50mA) must remain constant. Package type (16-DIP through-hole) and mounting configuration must also match.
Q: Are there temperature range differences between the ILQ1 and ILQ1X?
A: Yes. The ILQ1 operates from -40°C to 100°C, while the ILQ1X operates from -25°C to 100°C. Applications requiring operation below -25°C cannot use the ILQ1X as a substitute.
Q: What is the significance of the Last Time Buy status for the ILQ1?
A: Last Time Buy indicates that the manufacturer has discontinued production. Existing inventory is available, but no future manufacturing runs are planned. New designs should evaluate alternative parts such as the ILQ1X for long-term supply chain continuity.
Q: Are both parts RoHS compliant?
A: Yes. Both the ILQ1 and ILQ1X are ROHS3 compliant and carry identical REACH and ECCN classifications.
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