TLP781(D4-GRL-TC,F Equivalent & Substitute Parts

Part Overview

The TLP781(D4-GRL-TC,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 part is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar isolation performance.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP781(D4-GRL-TC,F
Manufacturer	Toshiba Semiconductor and Storage
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	100% @ 5mA
Current Transfer Ratio (Max)	200% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Operating Temperature	-55°C ~ 110°C
Package / Case	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the TLP781(D4-GRL-TC,F is determined by the following critical parameters:

Single-channel configuration
5000Vrms isolation voltage
Transistor output topology
4-DIP through-hole package (0.300", 7.62mm)
DC input type
Maximum output voltage of 80V
Maximum output current of 50mA per channel
Operating temperature range of -55°C to 110°C

Substitute parts must maintain all these electrical and mechanical specifications to ensure functional compatibility in existing circuit designs. Variations in Current Transfer Ratio, switching times, and saturation voltage are acceptable within the defined parameter ranges for this component category.

Parameter Comparison

Parameter	TLP781(D4-GRL-TC,F	TLP785(D4-GRL,F	TLP785(GRL,F	EL816(X)	EL816(X)-V
Manufacturer	Toshiba	Toshiba	Toshiba	Everlight	Everlight
Product Status	Obsolete	Active	Active	Active	Active
Number of Channels	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	100% @ 5mA	100% @ 5mA	100% @ 5mA	100% @ 5mA	100% @ 5mA
Current Transfer Ratio (Max)	200% @ 5mA	300% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.2V	1.2V
Current - DC Forward (If) (Max)	60mA	60mA	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV	200mV	200mV
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C
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)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole

Engineering Selection Recommendations

All listed substitute parts maintain electrical and mechanical compatibility with the TLP781(D4-GRL-TC,F within the specified parameter ranges. Selection among active alternatives should be based on product availability and compliance requirements.

TLP785(D4-GRL,F and TLP785(GRL,F are direct Toshiba alternatives with active product status. The TLP785(D4-GRL,F variant offers higher maximum Current Transfer Ratio (300% @ 5mA) compared to the original part (200% @ 5mA), while TLP785(GRL,F maintains the original Current Transfer Ratio specification.

EL816(X) and EL816(X)-V are Everlight Electronics alternatives with active product status and ROHS3 compliance. These parts feature lower Vce Saturation (200mV maximum) compared to Toshiba variants (400mV maximum), which may provide improved switching characteristics in specific applications.

Frequently Asked Questions (FAQ)

Q: Can TLP785(D4-GRL,F replace TLP781(D4-GRL-TC,F in existing designs?

A: Yes. Both parts share identical isolation voltage (5000Vrms), output type (transistor), package (4-DIP through-hole), and operating temperature range (-55°C to 110°C). The TLP785(D4-GRL,F is an active product with higher maximum Current Transfer Ratio (300% vs 200%), making it functionally compatible for direct substitution.

Q: What is the difference between TLP785(D4-GRL,F and TLP785(GRL,F?

A: Both are Toshiba TLP785 variants with identical electrical specifications. The primary difference is packaging: TLP785(D4-GRL,F is supplied in standard packaging, while TLP785(GRL,F is supplied in tube packaging. Electrical performance and pin configuration are equivalent.

Q: Are Everlight EL816(X) parts compatible with Toshiba TLP781 designs?

A: Yes. EL816(X) and EL816(X)-V maintain all critical parameters: 5000Vrms isolation, single-channel transistor output, 4-DIP through-hole package, 80V maximum output voltage, and 50mA maximum output current. The lower Vce Saturation (200mV vs 400mV) represents improved performance characteristics.

Q: What compliance certifications apply to substitute parts?

A: TLP785(GRL,F carries RoHS Compliant certification. EL816(X) and EL816(X)-V carry ROHS3 Compliant certification. All parts are classified under ECCN EAR99 and HTSUS 8541.49.8000.

Q: Are there inventory considerations when selecting substitutes?

A: TLP785(D4-GRL,F has 47,200 pieces in stock. TLP785(GRL,F has 1,099 pieces in stock. EL816(X) has 5,200 pieces in stock. EL816(X)-V has 689 pieces in stock. Availability should be confirmed based on project requirements and lead times.

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