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4N27SM
Isocom Components 2004 LTD
6PIN TRANSISTOR OUTPUT, SINGLE,
16459 Pcs New Original In Stock
Optoisolator Transistor with Base Output 7.5Vpk 1 Channel
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5.0 / 5.0
- (154 Ratings)
4N27SM
Product Overview
1909230
DiGi Electronics Part Number
4N27SM-DGManufacturer
Isocom Components 2004 LTD
4N27SM
Description
6PIN TRANSISTOR OUTPUT, SINGLE,Inventory
16459 Pcs New Original In Stock
Optoisolator Transistor with Base Output 7.5Vpk 1 Channel
Quantity
Minimum 1
Minimum 1
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4N27SM Technical Specifications
Category
Optoisolators, Transistor, Photovoltaic Output Optoisolators
Packaging
Tube
Series
4N27
Product Status
Active
Number of Channels
1
Voltage - Isolation
7.5Vpk
Current Transfer Ratio (Min)
10% @ 10mA
Current Transfer Ratio (Max)
-
Turn On / Turn Off Time (Typ)
-
Rise / Fall Time (Typ)
2µs, 2µs
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)
60 mA
Vce Saturation (Max)
500mV
Operating Temperature
-55°C ~ 100°C
Mounting Type
Surface Mount
Package / Case
6-SMD, Gull Wing
Supplier Device Package
-
Datasheet & Documents
Datasheets
Download 4N27SM Product Specification (PDF)
HTML Datasheet
4N27SM-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8541.49.8000
Additional Information
Other Names
58-4N27SM
56-4N27SM
56-4N27SM-DG
Standard Package
65
Alternative Parts
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MANUFACTURER
QUANTITY AVAILABLE
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UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
시간을 들여 상담해주시는 직원분 덕분에 구매 후에도 만족감이 크답니다. 사후 서비스가 정말 훌륭합니다.
Dec 02, 2025
Une fiabilité exemplaire pour la livraison et l'emballage.
Dec 02, 2025
Schneller Versand und eine freundliche, kompetente Nachbetreuung. Beste Erfahrung.
Dec 02, 2025
I appreciated how promptly they answered my inquiries and provided helpful assistance throughout my order.
Dec 02, 2025
You can tell the products are made with care and attention to detail.
Dec 02, 2025
The company's commitment to quality is evident through their consistent performance and reliable support.
Dec 02, 2025
Logistics was so fast that I received my order sooner than anticipated.
Dec 02, 2025
Their after-sales service is top-notch, making my bulk ordering experience seamless.
Dec 02, 2025
DiGi Electronics’ after-sales support is top-notch, making me feel confident in their service quality.
Dec 02, 2025
Their support team is approachable and provides timely assistance after delivery.
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Frequently Asked Questions (FAQ)
Can the 4N27SM optoisolator be safely used in a 24V industrial control circuit where the output transistor must switch a 40mA inductive load, and what design precautions are needed to avoid premature failure?
Yes, the 4N27SM can handle this application since its maximum output voltage is 30V and continuous collector current is rated up to 50mA. However, because you're driving an inductive load, you must include a flyback diode (e.g., 1N4007) across the load to suppress voltage spikes during turn-off. Additionally, ensure the base terminal is properly biased or left open depending on your speed requirements—connecting a pull-down resistor (10kΩ) to ground improves turn-off time. Operating near the 50mA limit reduces noise margin and increases Vce(sat), so consider derating to ≤35mA for long-term reliability, especially at elevated temperatures.
Is the 4N27SM a drop-in replacement for the older 4N28 in a legacy through-hole design, and what layout or performance trade-offs should I expect when migrating to the 4N27SM’s surface-mount package?
The 4N27SM is not a direct mechanical drop-in for the through-hole 4N28 due to its 6-SMD gull-wing package, but electrically it is a functional upgrade with similar CTR (10% min @ 10mA) and isolation voltage (7.5kVpk). When redesigning the PCB, note that the 4N27SM has lower thermal mass and may be more sensitive to reflow temperatures—follow MSL 1 guidelines but avoid excessive peak temperatures. Also, the SMD layout reduces parasitic inductance, improving transient response, but requires tighter creepage/clearance spacing; maintain ≥8mm between input and output traces to preserve isolation integrity on the same board.
How does the current transfer ratio (CTR) degradation over temperature affect long-term reliability of the 4N27SM in an automotive under-hood application cycling between -40°C and 100°C, and should I derate the input current?
CTR in the 4N27SM typically decreases at temperature extremes—especially above 85°C—due to LED efficiency drop and transistor gain reduction. In your automotive environment, assume CTR could fall below the nominal 10% minimum over time. To ensure reliable operation, increase the input forward current (If) to 15–20mA (within the 60mA max) to maintain sufficient output current margin. Include a safety factor of 2x on required output current and validate performance at both -40°C (slow turn-on) and 100°C (reduced CTR). Consider periodic functional testing or using a feedback mechanism if signal integrity is critical.
Can I parallel two 4N27SM channels to increase output current capability, and what are the risks of mismatched CTR and propagation delay in such a configuration?
Paralleling 4N27SM devices is not recommended due to inherent mismatches in CTR and turn-on/turn-off times (±2µs typical), which lead to current imbalance and potential thermal runaway. Even with matched input currents, one device may carry significantly more load, exceeding its 50mA rating. Instead, use a single higher-current optoisolator like the TLP290-4 or add a buffer transistor (e.g., NPN like 2N3904) at the output of one 4N27SM to boost current while preserving isolation. This approach is more reliable and avoids synchronization issues in timing-sensitive applications.
When replacing a failed 4N28XSM in a medical device with the 4N27SM, do I need to revalidate isolation safety certifications, and are there any hidden compatibility issues despite similar specs?
Although the 4N27SM shares key specs with the 4N28XSM (same isolation voltage, package, and CTR), medical devices often require component-level certification traceability. The 4N27SM is RoHS3 compliant and REACH unaffected, but verify that Isocom provides an IEC 60601-1 compliant certificate of conformance for your specific batch. Additionally, check creepage distance on your PCB—the 4N27SM’s pin spacing may differ slightly; ensure ≥6.4mm clearance between input and output sides to meet reinforced insulation requirements. Always perform hipot testing (e.g., 4kV AC for 60s) post-replacement to confirm isolation integrity before re-certification.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
4N27SM CAD Models
Isocom Components 2004 LTD 4N27SM PCB symbols & footprints
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