TLP781F(Y,F) Equivalent & Substitute Parts

Part Overview

The TLP781F(Y,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation and is housed in a 4-DIP package for through-hole mounting. The part is currently classified as obsolete, making identification of equivalent alternatives necessary for ongoing system support and new design implementations. Substitute parts must maintain identical electrical characteristics and mechanical compatibility to ensure direct replacement capability.

Key Parameters

Parameter	Value
Manufacturer	Toshiba Semiconductor and Storage
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	150% @ 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)
ECCN	EAR99
HTSUS	8541.49.8000

Substitute Part Grouping Explanation

Substitute parts for the TLP781F(Y,F) are qualified based on strict parametric equivalence across all critical electrical and mechanical specifications. The substitution logic is based on the following key parameters that must remain identical:

Single-channel configuration
5000Vrms isolation voltage
Current Transfer Ratio range: 50% to 150% @ 5mA
Switching times: 3µs turn-on/off, 2µs/3µs rise/fall
DC input with transistor output
Maximum output voltage of 80V
Output current capacity of 50mA per channel
Input forward voltage of 1.15V typical
Maximum forward current of 60mA
Vce saturation of 400mV maximum
Operating temperature range of -55°C to 110°C
4-DIP through-hole package format
MSL rating of 1 (Unlimited)

All substitute parts listed maintain these specifications without deviation. The primary distinction among substitutes is product status and available inventory levels.

Parameter Comparison

Parameter	TLP781F(Y,F)	TLP785F(Y,F)	TLP785F(D4-Y,F)	TLP785F(D4Y-F7,F)
Manufacturer	Toshiba	Toshiba	Toshiba	Toshiba
Number of Channels	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	150% @ 5mA	150% @ 5mA	150% @ 5mA	150% @ 5mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs
Input Type	DC	DC	DC	DC
Output Type	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	60mA	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV
Operating Temperature	-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
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)
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99	EAR99	EAR99
HTSUS	8541.49.8000	8541.49.8000	8541.49.8000	8541.49.8000
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

The TLP781F(Y,F) is classified as obsolete. Direct substitutes are available from the same manufacturer in active production status, ensuring long-term supply chain reliability and continued technical support.

All three substitute parts—TLP785F(Y,F), TLP785F(D4-Y,F), and TLP785F(D4Y-F7,F)—are manufactured by Toshiba Semiconductor and Storage and maintain active product status. These parts are parametrically equivalent to the original TLP781F(Y,F) across all specified electrical and mechanical characteristics.

Selection among the three active substitutes should be based on inventory availability and specific packaging variant requirements. TLP785F(D4-Y,F) offers the highest inventory level at 62,600 pieces, providing optimal supply chain continuity. TLP785F(Y,F) provides 1,046 pieces in stock, while TLP785F(D4Y-F7,F) offers 880 pieces.

All substitute parts carry identical export control classifications (ECCN: EAR99) and tariff codes (HTSUS: 8541.49.8000), ensuring compliance consistency with the original component.

Frequently Asked Questions (FAQ)

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

A: Yes. All three TLP785F variants maintain identical electrical specifications and mechanical compatibility. The 4-DIP through-hole package format, isolation voltage, switching characteristics, and output ratings are equivalent across all parts.

Q: What is the difference between TLP785F(Y,F), TLP785F(D4-Y,F), and TLP785F(D4Y-F7,F)?

A: The part number suffixes indicate different packaging or tape-and-reel configurations. All three variants are parametrically identical in electrical performance and physical package dimensions. Selection should be based on your procurement and assembly requirements.

Q: Why is the original TLP781F(Y,F) marked as obsolete?

A: Product obsolescence is determined by the manufacturer. The TLP785F series represents the current active production line for this optoisolator topology. Substitution to active parts ensures continued availability and manufacturer support.

Q: Are there any compatibility concerns when substituting to TLP785F variants?

A: No compatibility concerns exist. All substitute parts are pin-compatible, electrically equivalent, and mechanically identical in package format. Direct board-level substitution is supported without circuit modifications.

Q: What inventory levels are available for each substitute?

A: TLP785F(D4-Y,F) has 62,600 pieces available, TLP785F(Y,F) has 1,046 pieces, and TLP785F(D4Y-F7,F) has 880 pieces in stock.

Q: Do the substitute parts carry the same export and tariff classifications?

A: Yes. All substitute parts maintain identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications, ensuring regulatory compliance consistency.

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