TLP781(D4BLL-TP6,F Equivalent & Substitute Parts

Part Overview

The TLP781(D4BLL-TP6,F is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation in a 4-SMD surface mount package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain compatibility across isolation voltage, output type, channel configuration, and mounting technology while accommodating variations in current transfer ratio and switching characteristics.

Key Parameters

Parameter	Value
Manufacturer	Toshiba Semiconductor and Storage
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Output Type	Transistor
Current Transfer Ratio (Min)	200% @ 5mA
Current Transfer Ratio (Max)	400% @ 5mA
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Operating Temperature	-55°C ~ 110°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the TLP781(D4BLL-TP6,F are classified into two categories based on allowed electrical and mechanical parameters:

Parametric Equivalent (Same Package, Same CTR Range): Parts maintaining identical 4-SMD surface mount packaging, 5000Vrms isolation, single-channel transistor output, 200%-400% current transfer ratio at 5mA, 80V maximum output voltage, and 50mA output current. These parts are direct functional replacements with no package or performance trade-offs.

Parametric Equivalent (Alternative Manufacturer, Same Package): Parts from alternative manufacturers meeting the same electrical specifications and 4-SMD surface mount package requirements, with identical isolation voltage, output type, channel count, and output ratings. Variations in switching characteristics (rise/fall time, turn-on/turn-off time) and saturation voltage are within acceptable tolerance for this component category.

Similar Part (Different Package): Parts with identical electrical specifications but different mounting technology (through-hole vs. surface mount). These require circuit board redesign and are suitable only when package conversion is feasible.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ 5mA	CTR Max @ 5mA	Output Voltage (Max)	Output Current	Vce Sat (Max)	Package	Mounting	Status
TLP781(D4BLL-TP6,F	Toshiba	5000Vrms	200%	400%	80V	50mA	400mV	4-SMD	Surface Mount	Obsolete
TLP785(BLL-TP6,F	Toshiba	5000Vrms	200%	400%	80V	50mA	400mV	4-SMD	Surface Mount	Active
TLP785(D4B-T6,F	Toshiba	5000Vrms	50%	600%	80V	50mA	400mV	4-DIP	Through Hole	Active
EL816(S)(C)(TD)	Everlight Electronics	5000Vrms	200%	400%	80V	50mA	200mV	4-SMD	Surface Mount	Active
EL816(S)(C)(TD)-V	Everlight Electronics	5000Vrms	200%	400%	80V	50mA	200mV	4-SMD	Surface Mount	Active
EL816(S)(C)(TU)	Everlight Electronics	5000Vrms	200%	400%	80V	50mA	200mV	4-SMD	Surface Mount	Active
EL816(S)(C)(TU)-V	Everlight Electronics	5000Vrms	200%	400%	80V	50mA	200mV	4-SMD	Surface Mount	Active
EL816(S1)(C)(TD)	Everlight Electronics	5000Vrms	200%	400%	80V	50mA	200mV	4-SMD	Surface Mount	Active
EL816(S1)(C)(TD)-V	Everlight Electronics	5000Vrms	200%	400%	80V	50mA	200mV	4-SMD	Surface Mount	Active
EL816(S1)(C)(TU)	Everlight Electronics	5000Vrms	200%	400%	80V	50mA	200mV	4-SMD	Surface Mount	Active
EL816(S1)(C)(TU)-V	Everlight Electronics	5000Vrms	200%	400%	80V	50mA	200mV	4-SMD	Surface Mount	Active

Engineering Selection Recommendations

Primary Recommendation: TLP785(BLL-TP6,F from Toshiba is the direct replacement for the obsolete TLP781(D4BLL-TP6,F. Both parts share identical electrical specifications, 4-SMD surface mount packaging, and current transfer ratio characteristics. The TLP785 series is in active production status, ensuring long-term availability and supply chain stability.

Alternative Recommendation: EL816 series optoisolators from Everlight Electronics provide parametric equivalence across all critical electrical parameters: 5000Vrms isolation, 200%-400% current transfer ratio at 5mA, 80V maximum output voltage, and 50mA output current. All EL816 variants listed maintain 4-SMD surface mount packaging and active product status. The EL816 series exhibits lower Vce saturation voltage (200mV vs. 400mV), which represents improved switching performance. RoHS3 compliance is available across EL816 variants.

Package Conversion Option: TLP785(D4B-T6,F provides electrical equivalence but requires through-hole mounting technology. This part is suitable only when circuit board redesign to accommodate 4-DIP through-hole packaging is feasible. Current transfer ratio range differs (50%-600% vs. 200%-400%), requiring circuit validation.

Frequently Asked Questions (FAQ)

Q: Can TLP785(BLL-TP6,F directly replace TLP781(D4BLL-TP6,F without circuit modification?

A: Yes. Both parts maintain identical isolation voltage (5000Vrms), current transfer ratio range (200%-400% @ 5mA), output voltage rating (80V), output current (50mA), and 4-SMD surface mount package. Pin configuration and electrical performance are equivalent.

Q: What is the difference between Toshiba TLP785 and Everlight EL816 optoisolators?

A: Both meet the same electrical specifications for isolation voltage, current transfer ratio, and output ratings. The primary difference is Vce saturation voltage: TLP785 specifies 400mV maximum while EL816 specifies 200mV maximum. Lower saturation voltage in EL816 results in reduced power dissipation during switching. EL816 variants carry RoHS3 compliance certification.

Q: Are EL816(S)(C)(TD) and EL816(S1)(C)(TD) interchangeable?

A: Yes. Both variants maintain identical electrical specifications, 4-SMD surface mount packaging, and active product status. Differences in part number designations reflect internal Everlight classification but do not affect functional performance or pin compatibility.

Q: Why does TLP785(D4B-T6,F show different current transfer ratio limits?

A: TLP785(D4B-T6,F uses through-hole 4-DIP packaging rather than surface mount 4-SMD. The different CTR range (50%-600% vs. 200%-400%) reflects a different device variant within the TLP785 family. This part requires circuit board redesign and should be selected only when through-hole mounting is required.

Q: What compliance certifications apply to substitute parts?

A: TLP785 series parts carry MSL 1 (Unlimited) moisture sensitivity rating. EL816 series parts carry MSL 1 (Unlimited) rating and RoHS3 compliance. All parts listed are classified under ECCN EAR99 and HTSUS 8541.49.8000.

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