TLP781F(BLL-TP7,F) Equivalent & Substitute Parts

Part Overview

The TLP781F(BLL-TP7,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 industrial and consumer electronics. The part is currently obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and maintenance applications.

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)	400% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Operating Temperature	-55°C ~ 110°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the TLP781F(BLL-TP7,F) is determined by the following critical parameters:

Single channel configuration
5000Vrms isolation voltage
Transistor output topology
200% minimum and 400% maximum current transfer ratio at 5mA
80V maximum output voltage
50mA maximum output current per channel
DC input type
Operating temperature range -55°C to 110°C
Surface mount 4-SMD package with gull wing leads

Substitute parts are classified into two categories:

Direct Manufacturer Equivalent: TLP785F(BLL-T7,F) from Toshiba maintains identical electrical specifications but differs in mounting type (through-hole 4-DIP vs. surface mount 4-SMD).

Parametric Equivalents: EL816 series variants from Everlight Electronics Co Ltd match all critical electrical parameters and maintain the same surface mount 4-SMD package configuration. Minor variations in Vce saturation (200mV vs. 400mV) and rise/fall time specifications remain within functional tolerance for standard isolation applications.

Parameter Comparison

Parameter	TLP781F(BLL-TP7,F)	TLP785F(BLL-T7,F)	TLP785(BLL-TP6,F)	EL816(S)(C)(TD)	EL816(S)(C)(TD)-V	EL816(S)(C)(TU)	EL816(S)(C)(TU)-V	EL816(S1)(C)(TD)	EL816(S1)(C)(TD)-V	EL816(S1)(C)(TU)	EL816(S1)(C)(TU)-V
Manufacturer	Toshiba	Toshiba	Toshiba	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA
Current Transfer Ratio (Max)	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V	80V	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV
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	-55°C ~ 110°C	-55°C ~ 110°C
Mounting Type	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, Gull Wing	4-DIP (0.400", 10.16mm)	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete TLP781F(BLL-TP7,F) in surface mount applications, the TLP785(BLL-TP6,F) from Toshiba is the primary equivalent. This part maintains identical electrical specifications and package configuration while offering active product status and ongoing manufacturer support.

The EL816 series from Everlight Electronics Co Ltd provides parametric equivalence across all critical isolation and output specifications. All EL816 variants are active products with ROHS3 compliance certification. The lower Vce saturation specification (200mV vs. 400mV) in EL816 devices represents improved performance characteristics suitable for applications requiring lower output impedance.

For applications requiring through-hole mounting, the TLP785F(BLL-T7,F) maintains electrical equivalence but requires PCB layout modification due to package format change from surface mount to 4-DIP configuration.

Frequently Asked Questions (FAQ)

Q: Can EL816 series parts directly replace TLP781F in existing PCB layouts?

A: Yes. All EL816 variants maintain the 4-SMD gull wing package configuration identical to TLP781F, enabling direct PCB footprint compatibility without layout modification.

Q: What is the significance of the lower Vce saturation in EL816 parts?

A: The EL816 series specifies 200mV maximum Vce saturation compared to 400mV in TLP781F. This represents improved transistor saturation characteristics, resulting in lower output impedance and reduced power dissipation in the output stage.

Q: Are all EL816 variants electrically interchangeable?

A: All EL816 variants listed maintain identical electrical specifications for isolation voltage, current transfer ratio, output voltage, and output current. Variants differ in internal design codes (S vs. S1) and temperature grade designations (TD vs. TU), which do not affect functional equivalence for standard isolation applications.

Q: What is the impact of switching from Toshiba to Everlight for this application?

A: Both manufacturers produce optoisolators meeting the same electrical specifications and package standards. Everlight EL816 parts carry ROHS3 compliance certification. Component selection should be based on supply chain availability, cost considerations, and established qualification procedures within your organization.

Q: Is the TLP785F(BLL-T7,F) suitable as a replacement if PCB redesign is acceptable?

A: The TLP785F(BLL-T7,F) provides complete electrical equivalence but requires through-hole mounting versus surface mount. PCB layout modification is necessary. This option is applicable only when design flexibility permits package format change.

Q: What parameters must remain constant for substitution validity?

A: Isolation voltage (5000Vrms), current transfer ratio range (200-400% @ 5mA), output type (transistor), maximum output voltage (80V), maximum output current (50mA), and operating temperature range (-55°C to 110°C) must be maintained. Package format and mounting type may vary based on application requirements.

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