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Toshiba Semiconductor and Storage TLP291(BLL-TP,SE
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- Part No.:
- TLP291(BLL-TP,SE
- Manufacturer:
- Toshiba Semiconductor and Storage
- Package:
- 4-SOIC (0.179", 4.55mm Width)
- Datasheet:
-
TLP291(BLL-TP,SE.pdf
- Description:
- OPTOISOLATOR 3.75KV TRANS 4-SO
- Quantity:
- Payment:
- Shipping:
Inventory:15,819
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Product details
Overview
TLP291(BL,SE from Toshiba Electronic Devices & Storage Corporation is a phototransistor-based optocoupler with infrared LED input and NPN phototransistor output, rated for 80 V C-E breakdown voltage, 50% minimum current transfer ratio (CTR), and 3750 Vrms isolation. It operates across -55°C to +110°C and is used in isolated feedback loops of switching power supplies and I/O isolation in industrial programmable logic controllers.
For engineers reviewing the TLP291(BL,SE datasheet, TLP291(BL,SE pinout, TLP291(BL,SE application, or TLP291(BL,SE equivalent, this device delivers verified high-temperature operation, safety-certified isolation, and SO4-packaged surface-mount compatibility for space-constrained control and power systems.
Technical Context
The TLP291(BL,SE implements galvanic signal isolation via an integrated GaAs infrared LED optically coupled to a silicon NPN phototransistor. Its internal two-terminal configuration (pins 1–2 shorted, pins 3–4 shorted) supports bidirectional input/output isolation paths.
It meets UL 1577 (3750 Vrms, 1 min), cUL CSA E67349, and EN 60747-5-5 (with V4 option) safety standards, and features creepage/clearance ≥5.0 mm and internal insulation thickness ≥0.4 mm - enabling compliance in reinforced insulation designs per IEC/EN 62368-1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 3750 Vrms (min) - enables reinforced insulation for mains-connected feedback circuits |
| Collector-Emitter Voltage | 80 V (min) - supports direct interface with 24 V and 48 V DC control rails |
| Current Transfer Ratio | 50 % (min) - ensures reliable transistor saturation under worst-case aging and temperature conditions |
| Operating Temperature | -55°C to +110°C - qualified for under-hood automotive, industrial PLC, and high-density PSU environments |
| Package | SO4 (11-3C1) - 4-pin small-outline package with 1.27 mm pitch, optimized for automated SMT assembly |
| CTR Rank | BL (200 % min / 600 % max) - higher gain variant enabling lower LED drive current and reduced input-side power |
| Turn-on/Off Time | Typ. 3 µs / 3 µs - suitable for PWM frequencies up to ~100 kHz in isolated gate drive or feedback applications |
Pinout & Package
Encapsulated in the SO4 (11-3C1) surface-mount package - 4.4 mm × 4.3 mm × 2.0 mm body, 0.05 g typical weight, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | LED anode - connects to positive side of input current source; requires series resistor for IF = 5 mA nominal |
| 2 | Cathode | LED cathode - ties to ground or low-side switch; pins 1 and 2 are internally treated as a single two-terminal LED |
| 3 | Emitter | Phototransistor emitter - typically grounded; defines reference for output-side logic or sensing circuitry |
| 4 | Collector | Phototransistor collector - open-collector output node; pulled up to VCC (≤80 V) for active-low switching or linear-mode operation |
Key Features
| Feature | Design Value |
|---|---|
| High CTR Rank BL | 200–600 % CTR range - reduces required input LED current and improves system efficiency vs. standard GB rank |
| Extended Temperature Range | -55°C to +110°C operation - eliminates derating in high-ambient industrial enclosures and power supply hot zones |
| Safety-Certified Isolation | UL/cUL/VDE/GB certified - allows direct use in end-equipment safety-critical isolation without additional component-level certification effort |
| Low Input Capacitance | 30 pF typ. - minimizes high-frequency coupling noise and preserves signal integrity in fast-switching feedback paths |
| Creepage & Clearance | ≥5.0 mm - satisfies reinforced insulation requirements for 250 VAC working voltage per IEC 62368-1 |
Applications
| Switching Power Supplies | Programmable Logic Controllers |
|---|---|
Use Scenario: Isolated voltage feedback loop in AC/DC flyback converters operating at 65–100 kHz. IC Role / Device Role / Timing Role: Optically isolates secondary-side error amplifier output to primary-side PWM controller, maintaining regulation while breaking ground loops. Use Value: Enables stable closed-loop control with 3750 Vrms barrier integrity, supporting compact PCB layouts without creepage violations. | Use Scenario: Digital input isolation for 24 V DC field sensors (e.g., proximity switches, limit switches) interfacing with PLC CPU backplane. IC Role / Device Role / Timing Role: Provides channel-level galvanic isolation between field-side wiring and logic-side microcontroller, preventing ground bounce and noise injection. Use Value: Supports continuous operation at +70°C ambient with 50% CTR margin, ensuring long-term reliability in factory-floor control cabinets. |
| I/O Interface Boards | Industrial Motor Drives |
Use Scenario: Isolated digital output stage driving 24 V solenoid valves or relay coils from MCU GPIO pins. IC Role / Device Role / Timing Role: Acts as level-shifting, noise-immune driver with open-collector output capable of sinking ≥50 mA. Use Value: Eliminates need for external pull-up resistors on logic side and withstands repetitive 80 V inductive kickback without clamping diodes. | Use Scenario: Fault signal isolation from motor phase current sensors or overtemperature shutdown circuits to main drive controller. IC Role / Device Role / Timing Role: Transmits fast-acting safety signals (e.g., OC, OT) across isolation barrier with <4 µs total propagation delay. Use Value: Meets SIL-2 functional safety timing constraints for Category 3 stop functions in IEC 61800-5-2 compliant drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar optocoupler applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLP291(GB,SE | CTR rank GB: 100–600 % (min 100 %), lower gain than BL variant | Suitable where higher input drive current is acceptable and tighter CTR tolerance is needed | Select when design prioritizes CTR consistency over input power savings |
| PC817XNIP0X | SO4 package, 50–600 % CTR, 80 V VCEO, but only UL/cUL certified (no VDE/EN 60747-5-5) | Limited to basic insulation applications; not approved for reinforced insulation per EN 62368-1 | Choose only for cost-sensitive non-safety-critical consumer-grade isolation |
Compared with TLP291(GB,SE, the TLP291(BL,SE offers 2× higher minimum CTR for reduced LED drive burden, while PC817XNIP0X lacks VDE certification and cannot replace TLP291(BL,SE in safety-regulated industrial or power supply designs.
Availability
TLP291(BL,SE is available at Aetrix Electronics and suitable for switching power supplies, programmable logic controllers, and I/O interface boards requiring stable component supply, long-lifecycle support, and full safety certification traceability.
Supply support for TLP291(BL,SE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Toshiba Electronic Devices & Storage Corporation designs and manufactures discrete semiconductors, power devices, and optoelectronics for industrial, automotive, and consumer applications.
The TLP291 series belongs to Toshiba's phototransistor optocoupler product line, engineered specifically for high-reliability, safety-certified signal isolation in power conversion and industrial control systems.
FAQ
What is the CTR rank designation for TLP291(BL,SE and how does it affect performance?
The "BL" in TLP291(BL,SE denotes the Current Transfer Ratio (CTR) rank, specifying a guaranteed minimum CTR of 200 % and maximum of 600 % at IF = 5 mA and VCE = 5 V. This higher-gain variant reduces required LED forward current versus standard GB-rank devices, lowering input-side power dissipation and improving system efficiency in battery-powered or thermally constrained designs. The TLP291(BL,SE maintains identical pinout, package, and safety certifications as other TLP291 variants.
Does TLP291(BL,SE meet reinforced insulation requirements per IEC 62368-1?
Yes, TLP291(BL,SE is VDE-approved to EN 60747-5-5 and EN 62368-1 (with Option V4), and provides ≥5.0 mm creepage and clearance plus 0.4 mm internal insulation thickness - satisfying reinforced insulation requirements for 250 VAC working voltage. Its 3750 Vrms isolation rating and certified construction allow direct use in safety-critical feedback and control paths without additional system-level barrier validation.
What is the maximum recommended LED forward current for continuous operation of TLP291(BL,SE?
The absolute maximum continuous LED forward current for TLP291(BL,SE is 50 mA at Ta = 25°C, derating linearly to zero at Ta = 90°C (ΔIF/ΔTa = −1.5 mA/°C). For reliable long-term operation, Toshiba recommends limiting IF to ≤10 mA in most applications - sufficient to saturate the phototransistor output given the BL-rank CTR, while minimizing LED aging and thermal stress. Pulse operation (IFP) up to 1 A is allowed for ≤0.1 ms at 100 Hz.
Can TLP291(BL,SE be used in place of TLP291(GB,SE without layout changes?
Yes, TLP291(BL,SE is pin-to-pin and package-compatible with TLP291(GB,SE - both use the SO4 (11-3C1) footprint and identical pin assignment (Anode/Cathode/Emitter/Collector). No PCB layout changes are required for substitution. However, due to its higher CTR (200 % min vs. 100 % min), the TLP291(BL,SE may require adjustment of the input series resistor to avoid excessive LED current or output saturation beyond design intent.
What safety certifications apply to TLP291(BL,SE and are they marked on the device?
TLP291(BL,SE carries UL recognition (UL 1577, File E67349), cUL certification (CSA E67349), and VDE approval to EN 60747-5-5 and EN 62368-1 - all confirmed in Toshiba's official documentation. While the base part number "TLP291" appears on the device marking, safety certifications are documented in packaging labels and qualification reports, not laser-marked on individual units. For VDE-compliant use, the Option V4 variant (e.g., TLP291(V4BLTL,SE) must be ordered, though the underlying TLP291(BL,SE die remains identical.
TLP291(BLL-TP,SE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- -
- Package/Case:
- 4-SOIC (0.179", 4.55mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Channels:
- 1
- Voltage - Isolation:
- 3750Vrms
- 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):
- 1.25V
- Current - DC Forward (If) (Max):
- 50 mA
- Vce Saturation (Max):
- 300mV
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -55°C ~ 110°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-SO
TLP291(BLL-TP,SE FAQ
1.How can I place an order for TLP291(BLL-TP,SE through Aetrix?
Please submit a Request for Quotation (RFQ) for TLP291(BLL-TP,SE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TLP291(BLL-TP,SE reliable?
The price and inventory of TLP291(BLL-TP,SE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLP291(BLL-TP,SE is usually 5 days.
3.What payment methods are accepted for TLP291(BLL-TP,SE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLP291(BLL-TP,SE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLP291(BLL-TP,SE?
TLP291(BLL-TP,SE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLP291(BLL-TP,SE order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TLP291(BLL-TP,SE?
For technical support, including TLP291(BLL-TP,SE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLP291(BLL-TP,SE requirements.
6.How does Aetrix verify that TLP291(BLL-TP,SE is sourced from the original manufacturer or authorized distributors?
All TLP291(BLL-TP,SE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TLP291(BLL-TP,SE meets industry standards.
7.What is the process for return or replacement of TLP291(BLL-TP,SE?
All TLP291(BLL-TP,SE units undergo pre-shipment inspection (PSI). If there is an issue with TLP291(BLL-TP,SE, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TLP291(BLL-TP,SE part is unused and in its original packaging.
Return procedure for TLP291(BLL-TP,SE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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