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3N261TX Optoisolator Equivalent & Substitute Parts
Part Overview
The 3N261TX is a through-hole optoisolator with transistor output, rated for 1000VDC isolation voltage and designed for single-channel DC input applications. This component features a TO-72-4 metal can package and is classified as obsolete. Due to its obsolete status and limited availability in new production, identifying compatible substitute parts is 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 |
| Input Type | DC |
| Maximum Output Voltage | 30V |
| Maximum Output Current | 30mA per channel |
| Maximum Vce Saturation | 300mV |
| Operating Temperature Range | -55°C to 125°C |
| Package Type | TO-206AF, TO-72-4 Metal Can |
| Mounting Type | Through Hole |
Substitute Part Grouping Explanation
Substitution eligibility for the 3N261TX is determined by the following critical parameters:
- Isolation Voltage: Must equal 1000VDC
- Number of Channels: Must equal 1
- Output Type: Must be Transistor
- Input Type: Must be DC
- Maximum Output Voltage: Must equal or exceed 30V
- Maximum Output Current: Must equal or exceed 30mA
- Maximum Vce Saturation: Must equal or be lower than 300mV
- Operating Temperature Range: Must encompass -55°C to 125°C
- Package / Case: Must be TO-206AF or TO-72-4 Metal Can
- Mounting Type: Must be Through Hole
The 3N262 meets all substitution criteria as a direct replacement for the 3N261TX, with the additional advantage of active product status and improved current transfer ratio specifications.
Parameter Comparison
| Parameter | 3N261TX | 3N262 |
|---|---|---|
| Manufacturer | TT Electronics/Optek Technology | TT Electronics/Optek Technology |
| Category | Optoisolators | Optoisolators |
| Number of Channels | 1 | 1 |
| Voltage - Isolation | 1000VDC | 1000VDC |
| Current Transfer Ratio (Min) | 5% @ 1mA | 10% @ 1mA |
| Current Transfer Ratio (Max) | Not specified | 50% @ 1mA |
| Rise / Fall Time (Typ) | 20µs, 10µs (Max) | 20µs, 10µs (Max) |
| Input Type | DC | DC |
| Output Type | Transistor | Transistor |
| Voltage - Output (Max) | 30V | 30V |
| Current - Output / Channel | 30mA | 30mA |
| Voltage - Forward (Vf) (Typ) | 1.5V (Max) | 1.5V (Max) |
| Current - DC Forward (If) (Max) | 40mA | 40mA |
| Vce Saturation (Max) | 300mV | 300mV |
| Operating Temperature | -55°C to 125°C | -55°C to 125°C |
| Mounting Type | Through Hole | Through Hole |
| Package / Case | TO-206AF, TO-72-4 Metal Can | TO-206AF, TO-72-4 Metal Can |
| Product Status | Obsolete | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
Engineering Selection Recommendations
The 3N262 is the direct manufacturer-recommended substitute for the 3N261TX. Both components share identical electrical and mechanical specifications across all critical parameters. The 3N262 offers the following advantages:
- Active Product Status: The 3N262 is in active production, ensuring long-term availability and supply chain stability.
- Regulatory Compliance: The 3N262 is ROHS3 compliant, meeting current environmental and regulatory requirements, whereas the 3N261TX is RoHS non-compliant.
- Improved Current Transfer Ratio: The 3N262 provides a specified maximum current transfer ratio of 50% @ 1mA, compared to the unspecified maximum for the 3N261TX, offering better performance predictability.
For new designs or system replacements, the 3N262 is the appropriate selection. For legacy system maintenance where the 3N261TX is currently installed, the 3N262 provides a direct electrical and mechanical replacement without circuit modification.
Frequently Asked Questions (FAQ)
Q: Can the 3N262 be used as a direct replacement for the 3N261TX in existing circuits?
A: Yes. The 3N262 is electrically and mechanically identical to the 3N261TX across all specified parameters. No circuit modifications are required. The component uses the same TO-72-4 metal can package and through-hole mounting configuration.
Q: What is the difference between the 3N261TX and 3N262?
A: The primary differences are product status and regulatory compliance. The 3N261TX is obsolete and RoHS non-compliant, while the 3N262 is in active production and ROHS3 compliant. The 3N262 also provides a specified maximum current transfer ratio of 50% @ 1mA, whereas the 3N261TX does not specify a maximum value.
Q: Are there any package or pinout differences between these parts?
A: No. Both the 3N261TX and 3N262 use the TO-206AF and TO-72-4 metal can package with identical pinout and through-hole mounting configuration.
Q: Why is the 3N261TX classified as obsolete?
A: The 3N261TX has been discontinued by the manufacturer. The 3N262 is the active replacement part and is recommended for all new applications and system updates.
Q: What certifications apply to the 3N262?
A: The 3N262 is ROHS3 compliant and REACH unaffected. It carries an ECCN classification of EAR99 and HTSUS code 8541.49.8000.
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