TLP781F(D4-BL,F) Equivalent & Substitute Parts

Part Overview

The TLP781F(D4-BL,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation voltage and is housed in a 4-DIP through-hole package. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. Equivalent alternatives maintain identical electrical and mechanical specifications while offering active product status and improved supply availability.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP781F(D4-BL,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
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

Substitute parts for the TLP781F(D4-BL,F) are identified based on strict electrical and mechanical parameter equivalence. The following criteria determine substitution validity:

Critical Parameters for Substitution:

Voltage - Isolation: 5000Vrms
Number of Channels: 1
Output Type: Transistor
Current Transfer Ratio range: 200% to 600% @ 5mA
Turn On / Turn Off Time: 3µs, 3µs
Rise / Fall Time: 2µs, 3µs
Voltage - Output (Max): 80V
Current - Output / Channel: 50mA
Package / Case: 4-DIP (0.400", 10.16mm)
Mounting Type: Through Hole
Operating Temperature: -55°C ~ 110°C

All substitute parts listed maintain 100% compliance with these parameters. Substitutes are grouped by manufacturer part number variant and product status classification.

Parameter Comparison

Parameter	TLP781F(D4-BL,F)	TLP785F(D4-BL,F)	TLP785F(BL,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
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
Output Type	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA
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	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)
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

TLP785F(D4-BL,F) is the primary direct substitute for TLP781F(D4-BL,F). This part maintains identical electrical and mechanical specifications while offering active product status. The TLP785F(D4-BL,F) variant includes the full supplier device package designation and is recommended for new designs and production continuity.

TLP785F(BL,F) is a parametric equivalent substitute. This variant differs only in the supplier device package designation but maintains all critical electrical and mechanical parameters. The TLP785F(BL,F) is suitable for applications where the package variant designation does not impact procurement or assembly processes.

Both substitute parts are manufactured by Toshiba Semiconductor and Storage and carry identical compliance certifications (ECCN: EAR99; HTSUS: 8541.49.8000) as the original TLP781F(D4-BL,F).

Frequently Asked Questions (FAQ)

Q: Can TLP785F(D4-BL,F) be used as a direct replacement for TLP781F(D4-BL,F)?

A: Yes. The TLP785F(D4-BL,F) is a direct substitute. All electrical parameters, isolation voltage, current transfer ratio, timing characteristics, output voltage and current ratings, and thermal operating range are identical. The 4-DIP through-hole package and pin configuration are unchanged. The primary difference is product status: TLP785F(D4-BL,F) is active, while TLP781F(D4-BL,F) is obsolete.

Q: What is the difference between TLP785F(D4-BL,F) and TLP785F(BL,F)?

A: Both variants are parametrically equivalent. The difference lies in the supplier device package designation. TLP785F(D4-BL,F) includes the full designation, while TLP785F(BL,F) uses a shortened variant. All electrical specifications, isolation voltage, current transfer ratio, timing, output ratings, and package dimensions (4-DIP, 0.400", 10.16mm) remain identical.

Q: Are there any compatibility concerns when substituting these parts?

A: No compatibility concerns exist. All substitute parts use the same 4-DIP through-hole package with identical pin spacing (0.400", 10.16mm). PCB layouts, socket compatibility, and assembly processes require no modification. Electrical performance is fully equivalent across all specified operating conditions.

Q: What is the moisture sensitivity level for these optoisolators?

A: All parts in this substitution group carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply without special moisture control requirements.

Q: Are these parts subject to export control?

A: All parts carry ECCN classification EAR99 and HTSUS code 8541.49.8000. Export compliance requirements are identical across all variants.

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