TLP781(BL-TP6,F) Equivalent & Substitute Parts

Part Overview

The TLP781(BL-TP6,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support, maintenance, and new production alternatives.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP781(BL-TP6,F)
Manufacturer	Toshiba Semiconductor and Storage
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	200% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Operating Temperature	-55°C ~ 110°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the TLP781(BL-TP6,F) are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Electrical Parameters:

Single channel configuration
5000Vrms isolation voltage
Current Transfer Ratio: 200% (Min) @ 5mA and 600% (Max) @ 5mA
Transistor output type
Maximum output voltage: 80V
Maximum output current: 50mA per channel
DC input type
Operating temperature range: -55°C ~ 110°C

Mechanical Considerations:

Package type (Surface Mount or Through Hole variants acceptable)
Pin configuration compatibility with application circuit

Substitutes are grouped into two categories: direct manufacturer equivalents and parametric equivalents. Direct equivalents maintain identical electrical specifications with packaging variations. Parametric equivalents provide identical electrical performance with alternative package options.

Parameter Comparison

Parameter	TLP781(BL-TP6,F)	TLP785(BL-TP6,F)	TLP785F(BL-TP7,F)
Manufacturer	Toshiba	Toshiba	Toshiba
Number of Channels	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	200% @ 5mA	200% @ 5mA	200% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA
Output Type	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs
Input Type	DC	DC	DC
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C
Mounting Type	Surface Mount	Through Hole	Surface Mount
Package / Case	4-SMD, Gull Wing	4-DIP (0.300", 7.62mm)	4-SMD, Gull Wing
Product Status	Obsolete	Active	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Surface Mount Applications: TLP785F(BL-TP7,F) is the recommended substitute for TLP781(BL-TP6,F). Both components maintain identical electrical specifications and surface mount packaging. TLP785F(BL-TP7,F) carries active product status, ensuring long-term availability and manufacturing support. This part is suitable for direct replacement in existing surface mount designs without circuit modification.

For Through Hole Applications: TLP785(BL-TP6,F) provides equivalent electrical performance in a through-hole 4-DIP package. This option is appropriate when circuit board redesign to accommodate surface mount components is not feasible. TLP785(BL-TP6,F) maintains active product status and identical electrical characteristics.

Compliance and Certification: All substitute parts share identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications with the original TLP781(BL-TP6,F), ensuring regulatory compliance for applications requiring export or import documentation.

Frequently Asked Questions (FAQ)

Q: Can TLP785(BL-TP6,F) replace TLP781(BL-TP6,F) in existing designs? A: TLP785(BL-TP6,F) provides identical electrical specifications but uses through-hole 4-DIP packaging instead of surface mount. Circuit board layout modification is required. If surface mount packaging is necessary, use TLP785F(BL-TP7,F) instead.

Q: What is the difference between TLP785(BL-TP6,F) and TLP785F(BL-TP7,F)? A: Both parts are electrically identical with 5000Vrms isolation, 200-600% current transfer ratio, and 50mA output current. The primary difference is the supplier device package designation (TP6 vs TP7). Both are available in surface mount 4-SMD, Gull Wing configuration and carry active product status.

Q: Is the TLP781(BL-TP6,F) still available for purchase? A: TLP781(BL-TP6,F) is classified as obsolete. For new designs or ongoing production, use TLP785F(BL-TP7,F) for surface mount applications or TLP785(BL-TP6,F) for through-hole applications.

Q: Are there any thermal or performance differences between these optoisolators? A: All three parts share identical operating temperature range (-55°C ~ 110°C), turn-on/turn-off times (3µs), and rise/fall times (2µs, 3µs). Thermal performance and switching characteristics are equivalent across all substitutes.

Q: What is the Moisture Sensitivity Level (MSL) for these parts? A: All parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

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