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

Part Overview

The TLP781(D4-BL,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 through-hole package. The part is currently classified as obsolete, making identification of active equivalent alternatives essential for ongoing design support and procurement continuity.

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)	600% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 110°C
Package / Case	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the TLP781(D4-BL,F) is determined by strict equivalence across the following critical parameters:

Isolation voltage: 5000Vrms
Number of channels: 1
Output type: Transistor
Current transfer ratio range: 200% to 600% @ 5mA
Maximum output voltage: 80V
Maximum output current per channel: 50mA
Maximum Vce saturation: 400mV
Operating temperature range: -55°C ~ 110°C
Package type: 4-DIP through-hole
Mounting configuration: Through Hole

All substitute parts listed maintain identical electrical and mechanical specifications across these parameters. Differences in product status, packaging format (tube vs. standard), and compliance certifications are noted but do not affect functional interchangeability.

Parameter Comparison

Parameter	TLP781(D4-BL,F)	TLP785(D4-BL,F)	TLP785(BL,F)	TLP785(BL-LF6,F)	TLP785(D4BL-F6,F)
Manufacturer	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba
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)	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not specified	Not specified	RoHS Compliant	Not specified	Not specified

Engineering Selection Recommendations

All TLP785 variants listed are direct functional equivalents to the obsolete TLP781(D4-BL,F). Selection among the active alternatives should be based on the following criteria:

Product Availability: TLP785(BL,F) offers the highest inventory level (5999 pcs) and is available in tube packaging, making it the primary recommendation for new procurement.

Compliance Requirements: TLP785(BL,F) is certified RoHS Compliant. If regulatory compliance with RoHS standards is required, this variant is the specified choice.

Packaging Format: TLP785(D4-BL,F) and TLP785(D4BL-F6,F) maintain the D4 designation consistent with the original part number structure. TLP785(BL-LF6,F) includes lead-free processing designation (LF6).

Inventory Status: All substitute parts are in active production status, ensuring long-term availability and design continuity.

Frequently Asked Questions (FAQ)

Q: Can TLP785 variants be used as direct replacements for TLP781(D4-BL,F)?

A: Yes. All TLP785 variants listed maintain identical electrical specifications across isolation voltage, current transfer ratio, output voltage, output current, saturation voltage, and operating temperature range. The 4-DIP through-hole package and pin configuration are identical, enabling direct board-level substitution.

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

A: Both parts are electrically and mechanically equivalent. The D4 designation in TLP785(D4-BL,F) refers to the supplier device package designation. TLP785(BL,F) is available in tube packaging format, while TLP785(D4-BL,F) uses standard packaging. Functional performance is identical.

Q: Is RoHS compliance a factor in selecting a substitute?

A: RoHS compliance is specified only for TLP785(BL,F). If your application or regulatory environment requires RoHS Compliant components, TLP785(BL,F) is the appropriate selection. Other variants do not list RoHS status in the provided specifications.

Q: Are there any thermal or performance differences between the substitute parts?

A: No. All substitute parts share identical operating temperature range (-55°C ~ 110°C), current transfer ratio specifications, and output characteristics. Thermal performance and electrical behavior are equivalent across all variants.

Q: What packaging options are available for substitutes?

A: TLP785(BL,F) is supplied in tube packaging. TLP785(D4-BL,F), TLP785(BL-LF6,F), and TLP785(D4BL-F6,F) use standard packaging formats. All maintain the same 4-DIP through-hole configuration suitable for PCB assembly.

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