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4N48TX Optoisolator Equivalent & Substitute Parts
Part Overview
The 4N48TX is a 1000VDC optoisolator transistor with base output in a TO-78-6 metal can package, manufactured by TT Electronics/Optek Technology. This component provides galvanic isolation for single-channel DC signal transmission with integrated base drive capability. The 4N48TX is classified as obsolete, making identification of active equivalent parts essential for ongoing system support and new design implementations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Isolation Voltage | 1000VDC |
| Number of Channels | 1 |
| Output Type | Transistor with Base |
| Current Transfer Ratio (Min) | 100% @ 1mA |
| Current Transfer Ratio (Max) | 500% @ 1mA |
| Rise / Fall Time | 20µs, 20µs |
| Maximum Output Voltage | 40V |
| Maximum Output Current | 50mA per channel |
| Vce Saturation (Max) | 300mV |
| Operating Temperature Range | -55°C to 125°C |
| Package Type | TO-78-6 Metal Can |
| Mounting Type | Through Hole |
Substitute Part Grouping Explanation
Substitution for the 4N48TX is determined by strict equivalence across the following critical parameters:
- Isolation Voltage: 1000VDC minimum
- Number of Channels: Single channel only
- Output Configuration: Transistor with base output
- Current Transfer Ratio Range: 100% to 500% @ 1mA
- Rise/Fall Time: 20µs maximum
- Package: TO-78-6 Metal Can, through-hole mounting
- Operating Temperature: -55°C to 125°C minimum range
- Output Specifications: 40V maximum, 50mA per channel, 300mV Vce saturation
The JANTX4N48 meets all specified electrical and mechanical parameters for direct substitution. This part maintains identical functional characteristics while offering active product status and improved compliance certification.
Parameter Comparison
| Parameter | 4N48TX | JANTX4N48 |
|---|---|---|
| Manufacturer | TT Electronics / Optek Technology | TT Electronics / Optek Technology |
| Isolation Voltage | 1000VDC | 1000VDC |
| Number of Channels | 1 | 1 |
| Output Type | Transistor with Base | Transistor with Base |
| Current Transfer Ratio (Min) | 100% @ 1mA | 100% @ 1mA |
| Current Transfer Ratio (Max) | 500% @ 1mA | 500% @ 1mA |
| Rise / Fall Time | 20µs, 20µs | 20µs, 20µs |
| Maximum Output Voltage | 40V | 40V |
| Maximum Output Current | 50mA | 50mA |
| Vce Saturation (Max) | 300mV | 300mV |
| Operating Temperature | -55°C to 125°C | -55°C to 125°C |
| Package / Case | TO-78-6 Metal Can | TO-78-6 Metal Can |
| Mounting Type | Through Hole | Through Hole |
| Product Status | Obsolete | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
Engineering Selection Recommendations
The JANTX4N48 is the direct functional equivalent for the obsolete 4N48TX. Both parts share identical electrical specifications and mechanical packaging. The JANTX4N48 offers the advantage of active product status, ensuring continued availability and supply chain reliability. Additionally, the JANTX4N48 achieves ROHS3 compliance, whereas the 4N48TX is non-compliant. For applications requiring RoHS compliance or long-term component availability, the JANTX4N48 is the appropriate selection.
Frequently Asked Questions (FAQ)
Q: Can JANTX4N48 directly replace 4N48TX in existing designs?
A: Yes. The JANTX4N48 maintains identical electrical performance across all specified parameters including isolation voltage, current transfer ratio, output characteristics, and operating temperature range. The TO-78-6 metal can package and through-hole mounting are identical, enabling direct board-level substitution.
Q: What is the primary difference between these parts?
A: The 4N48TX is obsolete, while JANTX4N48 is active. The JANTX4N48 also achieves ROHS3 compliance. Electrical and mechanical specifications are equivalent.
Q: Are there any package or pinout differences?
A: No. Both parts use the TO-78-6 metal can package with identical pinout and through-hole mounting configuration.
Q: Does the JANTX4N48 meet the same isolation voltage specification?
A: Yes. Both parts provide 1000VDC isolation voltage with identical current transfer ratio performance of 100% to 500% @ 1mA.
Q: What is the inventory status for these parts?
A: The 4N48TX has 715 pieces in stock as new original inventory. The JANTX4N48 has 1760 pieces in stock as new original inventory in bulk packaging.
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