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TLP781(BLL-TP6,F)
Toshiba Semiconductor and Storage
PHOTOCOUPLER
3161 Pcs New Original In Stock
Optoisolator Transistor Output 5000Vrms 1 Channel 4-SMD
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5.0 / 5.0
- (262 Ratings)
TLP781(BLL-TP6,F)
Product Overview
3802254
DiGi Electronics Part Number
TLP781(BLL-TP6,F)-DGManufacturer
Toshiba Semiconductor and Storage
TLP781(BLL-TP6,F)
Description
PHOTOCOUPLERInventory
3161 Pcs New Original In Stock
Optoisolator Transistor Output 5000Vrms 1 Channel 4-SMD
Quantity
Minimum 1
Minimum 1
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TLP781(BLL-TP6,F) Technical Specifications
Category
Optoisolators, Transistor, Photovoltaic Output Optoisolators
Packaging
-
Series
-
Product Status
Obsolete
Number of Channels
1
Voltage - Isolation
5000Vrms
Current Transfer Ratio (Min)
200% @ 5mA
Current Transfer Ratio (Max)
400% @ 5mA
Turn On / Turn Off Time (Typ)
3µs, 3µs
Rise / Fall Time (Typ)
2µs, 3µs
Input Type
DC
Output Type
Transistor
Voltage - Output (Max)
80V
Current - Output / Channel
50mA
Voltage - Forward (Vf) (Typ)
1.15V
Current - DC Forward (If) (Max)
60 mA
Vce Saturation (Max)
400mV
Operating Temperature
-55°C ~ 110°C
Mounting Type
Surface Mount
Package / Case
4-SMD, Gull Wing
Supplier Device Package
4-SMD
Base Product Number
TLP781
Datasheet & Documents
HTML Datasheet
TLP781(BLL-TP6,F)-DG
Environmental & Export Classification
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8541.49.8000
Additional Information
Other Names
264-TLP781(BLL-TP6F)TR
Standard Package
2,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Je suis très satisfait de DiGi Electronics, leurs prix sont vraiment abordables et leur emballage écologique est un vrai plus.
Dec 02, 2025
J’apprécie la constance de leur livraison rapide et la solidité des produits, qui m évitent de devoir renouveler fréquemment.
Dec 02, 2025
Timely delivery from DiGi Electronics is consistent, making them a trusted partner for my needs.
Dec 02, 2025
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Dec 02, 2025
DiGi Electronics offers unbeatable prices that make shopping truly affordable for everyone.
Dec 02, 2025
I am impressed by how DiGi handles after-sales queries with professionalism and care.
Dec 02, 2025
The shipping is fast and efficient, and the prices are hard to beat anywhere else.
Dec 02, 2025
Their customer service team is genuinely passionate about helping clients.
Dec 02, 2025
DiGi Electronics uses high-quality packaging materials that protect products during shipment, showing their commitment to quality.
Dec 02, 2025
DiGi’s green packaging efforts are truly admirable and noteworthy.
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Frequently Asked Questions (FAQ)
Can the TLP781(BLL-TP6,F) be safely replaced with a modern optoisolator like the Toshiba TLP785 in a 24V industrial control circuit without redesigning the PCB or input drive circuitry?
The TLP781(BLL-TP6,F) is now obsolete, and while the TLP785 offers improved speed and CTR stability, direct drop-in replacement is not recommended without validation. Although both share a 4-SMD gull-wing package and similar pinout, the TLP785 has a lower typical forward voltage (1.15V vs. ~1.25V for TLP781) and faster switching times, which may affect current-limiting resistor selection and noise margins in high-impedance input stages. Additionally, the TLP785’s CTR is specified at 50mA output, whereas the TLP781 was rated at 5mA—this mismatch can lead to over-driving downstream logic if the original design relied on marginal CTR. Always verify input current requirements and output saturation behavior under actual load conditions before substitution.
What are the key reliability risks when using the TLP781(BLL-TP6,F) in a high-temperature automotive application near its 110°C maximum operating temperature?
Operating the TLP781(BLL-TP6,F) near its 110°C limit significantly accelerates LED degradation and reduces long-term CTR stability. At elevated temperatures, the infrared LED’s efficiency drops, requiring higher forward current to maintain the same output current—this creates a thermal runaway risk if feedback isn’t managed. Furthermore, prolonged exposure above 105°C can cause delamination or cracking in the internal bond wires due to CTE mismatch between the silicon die and mold compound. For automotive use, consider derating the forward current by at least 30% and implementing periodic functional testing. If sustained operation above 100°C is expected, migrate to a qualified AEC-Q101 optoisolator like the TLP785F or Broadcom ACPL-M71T.
How does the TLP781(BLL-TP6,F)'s 5000Vrms isolation voltage hold up in a 480VAC motor drive interface, and what safety margin should I design for?
While the TLP781(BLL-TP6,F)’s 5000Vrms isolation rating exceeds the peak voltage of a 480VAC system (~680V), this rating is for 1-minute dielectric testing—not continuous operation. In practice, transient surges (e.g., IEC 61000-4-5) can exceed 2kV, and partial discharge may initiate below the rated voltage over time, especially in humid environments. For motor drives, maintain a minimum 2:1 safety margin on working voltage; thus, 5000Vrms is acceptable only if system transients are clamped below 2500V. Always pair the TLP781 with external TVS diodes on both input and output sides and ensure creepage/clearance distances on the PCB meet IEC 60664-1 for pollution degree 2. Consider reinforced isolation alternatives like the Silicon Labs Si8711 for mission-critical drives.
Is it safe to parallel two TLP781(BLL-TP6,F) channels to increase output current beyond 50mA for driving a small relay coil?
Paralleling TLP781(BLL-TP6,F) outputs is strongly discouraged due to inherent CTR mismatch (±50% tolerance) and unequal thermal coupling. Even with matched forward currents, one transistor will conduct more current initially, heat up faster, and further increase its CTR—leading to thermal imbalance and potential failure of the dominant device. The TLP781 lacks built-in ballast resistors or current-sharing features. Instead, use a single optoisolator to drive a low-side NPN transistor or MOSFET rated for the relay current. If isolation is critical, select a higher-current optocoupler like the Lite-On LTV-847 (500mA per channel) or use the TLP781 to trigger a solid-state relay.
Can the TLP781(BLL-TP6,F) be used in a zero-crossing detection circuit for AC line monitoring, given its 3µs turn-on/off time?
The TLP781(BLL-TP6,F) is poorly suited for precise zero-crossing detection due to its asymmetric propagation delay and lack of Schmitt-trigger input conditioning. While its 3µs switching time seems fast, the actual turn-on delay varies significantly with input current and temperature—introducing jitter that can exceed 10µs near threshold levels. This makes accurate phase-angle measurement difficult in TRIAC or SSR control applications. For zero-crossing, prefer optoisolators with built-in zero-cross circuits like the Fairchild (onsemi) MOC3063 or use the TLP781 only as a crude presence detector with generous hysteresis. If you must use it, add an external comparator stage on the output and calibrate timing offsets in firmware.
Quality Assurance (QC)
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TLP781(BLL-TP6,F) CAD Models
Toshiba Semiconductor and Storage TLP781(BLL-TP6,F) PCB symbols & footprints
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