TLP781F(D4GRL-F7,F Optoisolator Equivalent & Substitute Parts

Part Overview

The TLP781F(D4GRL-F7,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 classified as obsolete. Due to its obsolete status, equivalent and parametrically compatible substitute parts from active manufacturers are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP781F(D4GRL-F7,F
Manufacturer	Toshiba Semiconductor and Storage
Category	Optoisolators
Product Status	Obsolete
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 (0.400", 10.16mm)
Mounting Type	Through Hole
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the TLP781F(D4GRL-F7,F are classified based on strict parameter matching across the following critical electrical and mechanical criteria:

Isolation Voltage: 5000Vrms minimum (5300Vrms acceptable as higher rating)

Current Transfer Ratio: 100% to 200% @ 5mA (core specification range)

Output Configuration: Transistor output type

Package: 4-DIP (0.400", 10.16mm) through-hole mounting

Operating Temperature Range: -55°C to 110°C

Output Voltage & Current: 80V maximum, 50mA per channel

Substitute parts are grouped into two categories:

Parametric Equivalents (Toshiba TLP785F variants): Identical electrical specifications with 100-200% CTR @ 5mA, same isolation voltage, and active product status.
Cross-Manufacturer Equivalents: Parts from Everlight Electronics (EL816 series) and Vishay Semiconductor (VO617C-3X016) meeting identical isolation voltage, CTR range, and package specifications with active status.

Parameter Comparison

Parameter	TLP781F(D4GRL-F7,F	TLP785F(D4GHF7,F	TLP785F(D4-GRL,F	TLP785F(GR-LF7,F	TLP785F(GRL,F	TLP785F(GRL-F7,F	EL816(M)(X)	EL816(M)(X)-V	VO617C-3X016
Manufacturer	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba	Everlight	Everlight	Vishay
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5300Vrms
CTR Min @ 5mA	100%	50%	100%	100%	100%	100%	100%	100%	100%
CTR Max @ 5mA	200%	600%	200%	200%	200%	200%	200%	200%	200%
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	—	—	6µs, 4µs
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	4µs, 3µs	4µs, 3µs	3µs, 3µs
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
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV	400mV	200mV	200mV	400mV
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
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)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Toshiba TLP785F Series):

The TLP785F variants—TLP785F(D4GHF7,F, TLP785F(D4-GRL,F, TLP785F(GR-LF7,F, TLP785F(GRL,F, and TLP785F(GRL-F7,F—are the preferred substitutes. All are active products from the same manufacturer with identical isolation voltage (5000Vrms), matching output specifications (80V, 50mA), and compatible operating temperature range. Four of the five variants (all except TLP785F(D4GHF7,F) maintain the exact CTR specification of 100-200% @ 5mA. The TLP785F(D4GHF7,F variant has a wider CTR range (50-600% @ 5mA) and should be selected only when the broader CTR tolerance is acceptable for the application.

Secondary Substitutes (Everlight EL816 Series):

The EL816(M)(X) and EL816(M)(X)-V from Everlight Electronics are parametrically equivalent alternatives. Both maintain 5000Vrms isolation, 100-200% CTR @ 5mA, 80V output voltage, and 50mA output current. The EL816 series exhibits lower Vce saturation (200mV vs. 400mV), which may provide improved switching performance. Both variants are RoHS3 compliant and active products. Rise/fall times are slightly longer (4µs, 3µs vs. 2µs, 3µs), which should be evaluated against timing-critical applications.

Tertiary Substitute (Vishay VO617C-3X016):

The VO617C-3X016 from Vishay Semiconductor Opto Division offers higher isolation voltage (5300Vrms) with identical CTR (100-200% @ 5mA), output voltage (80V), and output current (50mA). This part is RoHS3 compliant and active. Turn-on/turn-off times are longer (6µs, 4µs), and rise/fall times match the main part (3µs, 3µs). The elevated isolation rating provides additional margin for high-voltage isolation applications.

Selection Criteria:

For direct replacement in existing designs, select TLP785F variants with matching CTR specifications (100-200% @ 5mA). For new designs prioritizing cross-manufacturer supply chain diversity, Everlight EL816 or Vishay VO617C-3X016 are acceptable. Timing-sensitive applications should account for the longer switching times in EL816 and VO617C-3X016 variants.

Frequently Asked Questions (FAQ)

Q: Can TLP785F variants directly replace the obsolete TLP781F(D4GRL-F7,F?

A: Yes. The TLP785F series (excluding the D4GHF7,F variant) maintains identical electrical specifications: 5000Vrms isolation, 100-200% CTR @ 5mA, 80V output voltage, 50mA output current, and -55°C to 110°C operating range. All are active products in the same 4-DIP through-hole package. The TLP785F(D4GHF7,F variant has a wider CTR range (50-600%) and should be selected only if this tolerance is compatible with the circuit design.

Q: What is the difference between the five TLP785F variants listed?

A: All five TLP785F variants—TLP785F(D4GHF7,F, TLP785F(D4-GRL,F, TLP785F(GR-LF7,F, TLP785F(GRL,F, and TLP785F(GRL-F7,F—share identical electrical specifications except for CTR range. Four variants maintain 100-200% CTR @ 5mA (matching the original TLP781F). The TLP785F(D4GHF7,F has a broader 50-600% CTR range. Differences in part numbers reflect internal manufacturing or packaging variations. All are electrically interchangeable for applications requiring the 100-200% CTR specification.

Q: Are cross-manufacturer substitutes (Everlight, Vishay) compatible with the original TLP781F circuit?

A: Yes, with timing considerations. Everlight EL816 and Vishay VO617C-3X016 maintain the critical electrical parameters: 5000Vrms isolation (VO617C-3X016 provides 5300Vrms), 100-200% CTR @ 5mA, 80V output, and 50mA output current. However, both exhibit longer switching times. EL816 has rise/fall times of 4µs/3µs (vs. 2µs/3µs for TLP781F), and VO617C-3X016 has turn-on/turn-off times of 6µs/4µs. Applications with strict timing requirements should evaluate these differences against circuit specifications.

Q: What does the CTR (Current Transfer Ratio) specification mean, and why does it vary?

A: CTR is the ratio of output collector current to input LED current, expressed as a percentage. The TLP781F specifies 100-200% CTR @ 5mA, meaning the output current will be 1 to 2 times the input current at 5mA input. The TLP785F(D4GHF7,F variant has a wider range (50-600%), allowing greater design flexibility but requiring circuit validation. All other substitutes maintain the 100-200% specification, ensuring direct compatibility.

Q: Can I use the VO617C-3X016 in place of the TLP781F if isolation voltage is critical?

A: Yes. The VO617C-3X016 provides 5300Vrms isolation, which exceeds the TLP781F specification of 5000Vrms. This higher rating is suitable for applications requiring maximum isolation margin. All other electrical parameters (CTR, output voltage, output current, operating temperature) are compatible. Switching times are longer (6µs/4µs turn-on/turn-off vs. 3µs/3µs), which should be evaluated for timing-sensitive circuits.

Q: Are all substitute parts RoHS compliant?

A: Everlight EL816(M)(X) and EL816(M)(X)-V are explicitly RoHS3 compliant. Vishay VO617C-3X016 is RoHS3 compliant. Toshiba TLP785F variants do not list explicit RoHS status in the provided specifications. Confirm RoHS compliance requirements with the manufacturer or supplier for your specific application.

Q: What is the Moisture Sensitivity Level (MSL), and does it affect substitution?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed parts, including the original TLP781F and all substitutes, have MSL 1 rating, so moisture sensitivity is not a differentiating factor in substitution decisions.

Q: Can I mix different substitute parts in the same circuit board?

A: Yes, provided the circuit design accommodates the electrical parameter ranges. If using both TLP785F variants and cross-manufacturer parts (Everlight, Vishay), ensure the circuit tolerates the timing variations. The TLP785F(D4GHF7,F with its wider CTR range (50-600%) should not be mixed with the 100-200% CTR variants unless the circuit is designed to handle both ranges.

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