TLP781F(BLL,F) Equivalent & Substitute Parts

Part Overview

The TLP781F(BLL,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation voltage in a 4-DIP through-hole package and is designed for DC input applications requiring galvanic isolation. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP781F(BLL,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)	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)	60mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 110°C
Mounting Type	Through Hole
Package / Case	4-DIP (0.400", 10.16mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TLP781F(BLL,F) is determined by strict equivalence across the following critical parameters:

Voltage - Isolation: 5000Vrms
Number of Channels: 1
Output Type: Transistor
Input Type: DC
Package / Case: 4-DIP (0.400", 10.16mm)
Mounting Type: Through Hole
Current Transfer Ratio (Min): 200% @ 5mA
Current Transfer Ratio (Max): 400% @ 5mA
Voltage - Output (Max): 80V
Current - Output / Channel: 50mA
Operating Temperature: -55°C ~ 110°C

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Toshiba TLP785 Series): Parts sharing identical electrical specifications and packaging with the obsolete TLP781F(BLL,F). These include TLP785F(BLL,F), TLP785F(BL-LF7,F), TLP785F(BLL-F7,F), and TLP785F(D4-BLL,F). All maintain active product status.

Parametric Equivalents (Everlight EL816/EL817 Series): Parts meeting all critical electrical and mechanical parameters while originating from an alternative manufacturer. These include EL816(M)(C), EL816(M)(C)-V, EL817(M)(C)-G, and EL817(M)(C)-VG. All are RoHS3 compliant and maintain active product status.

Parameter Comparison

Parameter	TLP781F(BLL,F)	TLP785F(BLL,F)	TLP785F(BL-LF7,F)	TLP785F(BLL-F7,F)	TLP785F(D4-BLL,F)	EL816(M)(C)	EL816(M)(C)-V	EL817(M)(C)-G	EL817(M)(C)-VG
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA
Current Transfer Ratio (Max)	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	—	—	—	—
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	4µs, 3µs	4µs, 3µs	6µs, 8µs	6µs, 8µs
Input Type	DC	DC	DC	DC	DC	DC	DC	DC	DC
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V	1.15V	1.2V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV	200mV	200mV	200mV	200mV
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	—	—	—	—	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Toshiba TLP785 Series (Direct Manufacturer Equivalents): The TLP785F variants represent the primary substitution path for the obsolete TLP781F(BLL,F). These parts maintain identical electrical specifications, timing characteristics, and packaging. All TLP785F variants are in active production status, ensuring long-term availability and supply chain stability. Selection among TLP785F(BLL,F), TLP785F(BL-LF7,F), TLP785F(BLL-F7,F), and TLP785F(D4-BLL,F) is determined by specific packaging variant requirements and supplier inventory availability.

Everlight EL816/EL817 Series (Parametric Equivalents): The EL816(M)(C), EL816(M)(C)-V, EL817(M)(C)-G, and EL817(M)(C)-VG optoisolators meet all critical electrical and mechanical substitution criteria. These components are RoHS3 compliant and maintain active product status. Differences in rise/fall time characteristics (EL816 series: 4µs/3µs; EL817 series: 6µs/8µs) and Vce saturation voltage (200mV versus 400mV) represent measurable deviations from the original TLP781F(BLL,F) specification. These differences are within the functional tolerance of most DC isolation applications but require circuit-level evaluation for timing-critical implementations.

Frequently Asked Questions (FAQ)

Q: Can TLP785F variants be used as direct replacements for TLP781F(BLL,F)?

A: Yes. The TLP785F series maintains identical electrical specifications, timing parameters, and 4-DIP through-hole packaging. All TLP785F variants are pin-compatible and functionally equivalent. The primary advantage is active production status, ensuring continued availability.

Q: What are the key differences between Toshiba TLP785 and Everlight EL816/EL817 substitutes?

A: Both meet the core isolation voltage (5000Vrms), current transfer ratio (200-400% @ 5mA), and output specifications. The EL816 series exhibits slightly slower rise/fall times (4µs/3µs versus 2µs/3µs) and lower Vce saturation (200mV versus 400mV). The EL817 series shows further timing degradation (6µs/8µs). These differences are acceptable for standard DC isolation circuits but may impact performance in high-speed switching applications.

Q: Are Everlight EL816 and EL817 parts interchangeable with each other?

A: Both EL816 and EL817 variants meet the substitution criteria for TLP781F(BLL,F). Selection between them depends on timing requirements. EL816 variants provide faster switching (4µs/3µs rise/fall time), while EL817 variants are suitable for applications with relaxed timing constraints (6µs/8µs rise/fall time).

Q: Does RoHS3 compliance affect substitution decisions?

A: RoHS3 compliance is a regulatory requirement for many applications. Everlight EL816 and EL817 parts are explicitly RoHS3 compliant. Toshiba TLP785 variants do not specify RoHS status in the provided data. For applications requiring RoHS3 certification, Everlight parts provide documented compliance.

Q: Are all substitute parts available in the same 4-DIP package?

A: Yes. All substitute parts—TLP785F variants, EL816 variants, and EL817 variants—are packaged in 4-DIP (0.400", 10.16mm) through-hole format, ensuring mechanical and electrical compatibility with existing PCB designs.

Q: What is the impact of Vce saturation differences on circuit performance?

A: The TLP781F(BLL,F) specifies 400mV maximum Vce saturation, while Everlight EL816/EL817 parts specify 200mV. Lower saturation voltage reduces output voltage drop and power dissipation in the transistor output stage. This difference is beneficial for most applications but requires evaluation if the original design relied on the higher saturation voltage for specific circuit functions.

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