Request Quote
(Ships tomorrow)
4N35-X019T Optoisolator Equivalent & Substitute Parts
Part Overview
The 4N35-X019T is an optoisolator transistor with base output manufactured by Vishay Semiconductor Opto Division. This single-channel device provides 5000Vrms isolation with DC input and transistor output configuration in a 6-SMD surface mount package. The part is active and in production with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when inventory constraints, lead time requirements, or design flexibility necessitate alternative sourcing while maintaining electrical and mechanical compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 4N35-X019T |
| Manufacturer | Vishay Semiconductor Opto Division |
| Category | Optoisolators |
| Number of Channels | 1 |
| Voltage - Isolation | 5000Vrms |
| Current Transfer Ratio (Min) | 100% @ 10mA |
| Turn On / Turn Off Time (Typ) | 10µs, 10µs |
| Input Type | DC |
| Output Type | Transistor with Base |
| Voltage - Output (Max) | 30V |
| Current - Output / Channel | 50mA |
| Voltage - Forward (Vf) (Typ) | 1.2V |
| Current - DC Forward (If) (Max) | 60mA |
| Operating Temperature | -55°C ~ 100°C |
| Mounting Type | Surface Mount |
| Package / Case | 6-SMD, Gull Wing |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the 4N35-X019T are classified into two categories based on electrical parameter alignment:
Parametric Equivalents (Vishay 4N35 Series): Parts 4N35-X007T, 4N35-X009T, and 4N35-X017T maintain identical electrical specifications including 5000Vrms isolation voltage, 100% minimum current transfer ratio at 10mA, 10µs switching times, 30V maximum output voltage, and 50mA output current. These parts share the same base product number (4N35), package configuration (6-SMD Gull Wing), and operating temperature range. Substitution is direct for applications requiring these exact parameters.
Manufacturer-Recommended Alternatives (Isocom 4N25/4N26/4N27/4N28/4N35X Series): Parts from Isocom Components including 4N25XSMT&R, 4N26XSMT&R, 4N27XSMT&R, 4N28XSM, 4N35XSM, and 4N35XSMT&R provide functional equivalence with parameter variations. These alternatives maintain the same output type (transistor with base), package form factor (6-SMD Gull Wing), output voltage (30V max), output current (50mA), forward voltage (1.2V typical), and operating temperature range (-55°C to 100°C). Isolation voltage specifications vary between 5300Vrms and 7.5Vpk, and current transfer ratios range from 10% to 100% at 10mA. Rise/fall times are specified at 2µs typical for Isocom parts versus 10µs for Vishay variants.
Parameter Comparison
| Part Number | Manufacturer | Isolation Voltage | CTR Min @ 10mA | Switching Time (Typ) | Output Voltage (Max) | Output Current | Package | Vce Sat (Max) |
|---|---|---|---|---|---|---|---|---|
| 4N35-X019T | Vishay | 5000Vrms | 100% | 10µs | 30V | 50mA | 6-SMD Gull Wing | — |
| 4N35-X007T | Vishay | 5000Vrms | 100% | 10µs | 30V | 50mA | 6-SMD Gull Wing | — |
| 4N35-X009T | Vishay | 5000Vrms | 100% | 10µs | 30V | 50mA | 6-SMD Gull Wing | — |
| 4N35-X017T | Vishay | 5000Vrms | 100% | 10µs | 30V | 50mA | 6-SMD Gull Wing | — |
| 4N25XSMT&R | Isocom | 5300Vrms | 20% | — | 30V | 50mA | 6-SMD Gull Wing | 500mV |
| 4N26XSMT&R | Isocom | 5300Vrms | 20% | — | 30V | 50mA | 6-SMD Gull Wing | 500mV |
| 4N27XSMT&R | Isocom | 5300Vrms | 10% | — | 30V | 50mA | 6-SMD Gull Wing | 500mV |
| 4N28XSM | Isocom | 7.5Vpk | 10% | — | 30V | 50mA | 6-SMD Gull Wing | 500mV |
| 4N35XSM | Isocom | 7.5Vpk | 100% | — | 30V | 50mA | 6-SMD Gull Wing | 300mV |
| 4N35XSMT&R | Isocom | 5300Vrms | 100% | — | 30V | 50mA | 6-SMD Gull Wing | 300mV |
Engineering Selection Recommendations
Direct Substitution (Parametric Equivalents): The Vishay 4N35 series variants (4N35-X007T, 4N35-X009T, 4N35-X017T) are direct substitutes for the 4N35-X019T. All maintain identical isolation voltage (5000Vrms), current transfer ratio (100% minimum), switching characteristics (10µs), and output specifications. These parts carry ROHS3 compliance and MSL 1 rating. Selection among these variants is based on inventory availability and lead time requirements without electrical redesign.
Alternative Sourcing (Isocom Series): The Isocom 4N25XSMT&R and 4N35XSMT&R provide functional substitution with higher isolation voltage (5300Vrms) and improved Vce saturation characteristics (300mV for 4N35XSMT&R versus unspecified for Vishay). The 4N35XSMT&R maintains 100% current transfer ratio matching the primary part. Both Isocom alternatives carry ROHS3 compliance and REACH Unaffected status. These options are suitable when Isocom supply chain advantages or enhanced isolation specifications align with application requirements.
Limited Substitution (Lower CTR Variants): The Isocom 4N25XSMT&R, 4N26XSMT&R, and 4N27XSMT&R feature reduced current transfer ratios (20% and 10% respectively) compared to the 100% minimum of the 4N35-X019T. These parts are suitable only for applications where lower CTR is acceptable or where input current drive capability is higher than the primary design. The 4N28XSM and 4N35XSM feature significantly reduced isolation voltage (7.5Vpk) and are not recommended for high-voltage isolation applications.
Frequently Asked Questions (FAQ)
Q: Can I substitute 4N35-X007T directly for 4N35-X019T without circuit modification?
A: Yes. The 4N35-X007T is a parametric equivalent with identical isolation voltage (5000Vrms), current transfer ratio (100% @ 10mA), switching times (10µs), and output specifications (30V, 50mA). Both use the same 6-SMD Gull Wing package. No circuit changes are required.
Q: What is the key difference between Vishay 4N35-X019T and Isocom 4N35XSMT&R?
A: Both maintain 100% current transfer ratio and 5000Vrms+ isolation. The primary differences are manufacturer, Vce saturation specification (300mV for Isocom versus unspecified for Vishay), and rise/fall time characterization (2µs for Isocom versus unspecified for Vishay). Packaging and electrical performance are compatible.
Q: Why should I avoid 4N27XSMT&R as a substitute?
A: The 4N27XSMT&R has a 10% minimum current transfer ratio compared to 100% for the 4N35-X019T. This lower CTR requires higher input current to achieve the same output performance. Use only if your circuit design accommodates higher input drive requirements.
Q: Are Isocom 4N28XSM and 4N35XSM suitable replacements?
A: No. Both feature 7.5Vpk isolation voltage, significantly lower than the 5000Vrms specification of the 4N35-X019T. These parts are not suitable for high-voltage isolation applications and should not be used as substitutes.
Q: What packaging options are available for substitutes?
A: Vishay parametric equivalents (4N35-X007T, 4N35-X009T, 4N35-X017T) are supplied in Tape & Reel (TR). Isocom alternatives include both Tube packaging (4N25XSM, 4N28XSM, 4N35XSM) and Tape & Reel (4N25XSMT&R, 4N26XSMT&R, 4N27XSMT&R, 4N35XSMT&R). Verify packaging compatibility with your assembly process requirements.
Q: Do all substitutes meet RoHS compliance?
A: Yes. All listed substitutes carry ROHS3 compliance. Isocom parts additionally specify REACH Unaffected status where applicable.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts