TLP781(D4-BLL,F) Equivalent & Substitute Parts

Part Overview

The TLP781(D4-BLL,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation and is designed for DC input applications requiring galvanic isolation in 4-DIP through-hole packages. The product is currently obsolete, making identification of equivalent and substitute parts essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
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
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Operating Temperature	-55°C ~ 110°C
Mounting Type	Through Hole
Package / Case	4-DIP (0.300", 7.62mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TLP781(D4-BLL,F) is determined by the following critical parameters that must remain constant across all equivalent parts:

Single channel configuration
5000Vrms isolation voltage
Transistor output topology
80V maximum output voltage
50mA maximum output current per channel
DC input type
4-DIP through-hole package (0.300", 7.62mm)
Operating temperature range -55°C to 110°C
Current transfer ratio minimum 200% @ 5mA

Substitute parts are grouped into two categories: direct manufacturer equivalents from Toshiba and parametric equivalents from alternative manufacturers (Everlight Electronics). All listed substitutes maintain electrical compatibility within the specified parameter ranges.

Parameter Comparison

Parameter	TLP781(D4-BLL,F)	TLP785(D4-BLL,F)	TLP785(BLL,F)	EL816(C)	EL816(C)-V	EL817(C)-G	EL817(C)-VG
Manufacturer	Toshiba	Toshiba	Toshiba	Everlight	Everlight	Everlight	Everlight
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Number of Channels	1	1	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	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
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs	-	-	-	-
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs	4µs, 3µs	4µs, 3µs	6µs, 8µs	6µs, 8µs
Input Type	DC	DC	DC	DC	DC	DC	DC
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	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
Vce Saturation (Max)	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
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	-	-	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the obsolete TLP781(D4-BLL,F), the following selection criteria apply:

Toshiba Direct Equivalents (Recommended for Toshiba-based designs):

TLP785(D4-BLL,F) and TLP785(BLL,F) are active Toshiba products with identical electrical specifications to the TLP781(D4-BLL,F). These parts maintain the same turn-on/turn-off timing (3µs, 3µs) and rise/fall time characteristics (2µs, 3µs). Both are pin-compatible replacements with full parametric equivalence.

Everlight Electronics Alternatives (For multi-source strategies):

EL816(C) and EL816(C)-V provide parametric equivalence with slightly different timing characteristics (4µs rise/fall time vs. 2µs/3µs for Toshiba parts) and lower Vce saturation (200mV vs. 400mV). These parts are ROHS3 compliant and actively manufactured.
EL817(C)-G and EL817(C)-VG offer parametric equivalence with extended rise/fall times (6µs, 8µs). These parts are ROHS3 compliant and actively manufactured.

All substitute parts maintain the critical isolation voltage (5000Vrms), output voltage rating (80V), output current capability (50mA), and operating temperature range (-55°C to 110°C) required for functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can TLP785(D4-BLL,F) directly replace TLP781(D4-BLL,F)? A: Yes. TLP785(D4-BLL,F) is a direct Toshiba equivalent with identical electrical specifications, timing characteristics, and 4-DIP package. It is pin-compatible and functionally equivalent.

Q: What is the difference between Toshiba TLP785 variants and Everlight EL816/EL817 parts? A: All parts maintain the same isolation voltage (5000Vrms), output voltage (80V), and output current (50mA). The primary differences are timing characteristics and Vce saturation voltage. Toshiba TLP785 parts have faster switching times (2µs/3µs rise/fall) and higher Vce saturation (400mV). Everlight parts have slower switching times (4µs/3µs for EL816; 6µs/8µs for EL817) and lower Vce saturation (200mV).

Q: Are Everlight EL816 and EL817 parts interchangeable? A: Both are parametrically equivalent to the TLP781(D4-BLL,F) and maintain all critical electrical parameters. However, EL817 parts have extended rise/fall times (6µs, 8µs) compared to EL816 (4µs, 3µs). Selection depends on application timing requirements.

Q: What does ROHS3 compliance mean for substitute parts? A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements. Everlight parts (EL816 and EL817 series) are ROHS3 compliant. This certification status is provided for regulatory and procurement purposes.

Q: Are all substitute parts available in the same packaging? A: Yes. All listed substitute parts use the 4-DIP (0.300", 7.62mm) through-hole package, ensuring mechanical and electrical compatibility with existing PCB designs.

Q: What is the inventory status of substitute parts? A: TLP785(D4-BLL,F) has 6690 units in stock. TLP785(BLL,F) has 798 units. EL816(C) has 784 units. EL816(C)-V has 4500 units. EL817(C)-G has 1151 units. EL817(C)-VG has 777 units. Availability should be confirmed with suppliers for production requirements.

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