TCLT1108 Equivalent & Substitute Parts

Part Overview

The TCLT1108 is an optoisolator transistor with base output manufactured by Vishay Semiconductor Opto Division. This component provides galvanic isolation up to 5000Vrms with a single channel transistor output configuration in a 6-SOP package. The device is actively produced and widely used in industrial control, power management, and signal isolation applications where high voltage isolation and base drive capability are required. Substitute parts may be necessary due to supply constraints, packaging preferences, or specific application requirements while maintaining functional compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	TCLT1108
Manufacturer	Vishay Semiconductor Opto Division
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	130% @ 5mA
Current Transfer Ratio (Max)	260% @ 5mA
Output Type	Transistor with Base
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Operating Temperature	-55°C ~ 100°C
Package / Case	6-SOIC (0.295", 7.50mm Width), 5 Leads
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution of the TCLT1108 is determined by the following critical parameters:

Isolation Voltage: Minimum 5000Vrms required for functional equivalence
Number of Channels: Must be 1 channel
Output Type: Transistor configuration (with or without base output)
Current Transfer Ratio: Range 130% to 260% @ 5mA
Maximum Output Voltage: 80V capability
Output Current: 50mA per channel
Operating Temperature Range: -55°C to 100°C
Mounting Type: Surface Mount
Compliance: ROHS3 Compliant, REACH Unaffected

The HCPL-181-06BE from Broadcom Limited is identified as a manufacturer-recommended substitute. While this part operates at a lower isolation voltage (3750Vrms), it maintains electrical compatibility across current transfer ratio, output voltage, output current, and temperature specifications. The primary trade-off is reduced isolation voltage and a different package form factor (4-Mini-Flat versus 6-SOIC).

Parameter Comparison

Parameter	TCLT1108 (Vishay)	HCPL-181-06BE (Broadcom)	Compatibility Notes
Number of Channels	1	1	Matched
Voltage - Isolation	5000Vrms	3750Vrms	Substitute rated lower; verify application isolation requirements
Current Transfer Ratio (Min)	130% @ 5mA	130% @ 5mA	Matched
Current Transfer Ratio (Max)	260% @ 5mA	260% @ 5mA	Matched
Output Type	Transistor with Base	Transistor	Substitute lacks base output; circuit redesign may be required
Voltage - Output (Max)	80V	80V	Matched
Current - Output / Channel	50mA	50mA	Matched
Vce Saturation (Max)	300mV	200mV	Substitute has lower saturation voltage; improved performance
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	Matched
Package / Case	6-SOIC (0.295", 7.50mm Width), 5 Leads	4-SMD, Gull Wing	Different package; PCB layout modification required
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Matched
Product Status	Active	Active	Both actively manufactured

Engineering Selection Recommendations

TCLT1108 (Primary Selection)

Use the TCLT1108 when the application requires 5000Vrms isolation voltage and base drive output capability. This part is actively produced by Vishay and maintains full compliance with ROHS3 and REACH requirements. The 6-SOIC package is widely supported in standard PCB design libraries.

HCPL-181-06BE (Substitute Selection)

The HCPL-181-06BE is suitable as a substitute only when the application isolation requirement is 3750Vrms or lower and the circuit can accommodate a standard transistor output without base drive. This part is actively produced by Broadcom and meets all compliance standards. The 4-Mini-Flat package requires PCB layout modification and may have different thermal characteristics. Both parts share identical current transfer ratio specifications and operating temperature ranges, ensuring functional compatibility within these constraints.

Frequently Asked Questions (FAQ)

Q: Can HCPL-181-06BE directly replace TCLT1108 without circuit modification?

A: No. The HCPL-181-06BE has two significant differences: reduced isolation voltage (3750Vrms versus 5000Vrms) and no base output (standard transistor output only). Applications requiring 5000Vrms isolation or base drive capability cannot use this substitute without circuit redesign.

Q: What is the isolation voltage difference between these parts?

A: The TCLT1108 provides 5000Vrms isolation, while the HCPL-181-06BE provides 3750Vrms isolation. This 1250Vrms reduction must be evaluated against the specific isolation requirements of the target application.

Q: Are the packages compatible?

A: No. The TCLT1108 uses a 6-SOIC (0.295", 7.50mm Width) package with 5 leads, while the HCPL-181-06BE uses a 4-Mini-Flat package. PCB footprint and layout modifications are required for substitution.

Q: Do both parts have the same current transfer ratio?

A: Yes. Both the TCLT1108 and HCPL-181-06BE maintain a current transfer ratio range of 130% to 260% @ 5mA, ensuring equivalent optical coupling performance.

Q: What compliance certifications apply to both parts?

A: Both parts are ROHS3 Compliant, REACH Unaffected, and carry EAR99 export classification. Both are actively manufactured and available in production quantities.

Q: How do the output saturation voltages compare?

A: The TCLT1108 has a maximum Vce saturation of 300mV, while the HCPL-181-06BE has a maximum of 200mV. The substitute exhibits lower saturation voltage, which may improve switching performance in some applications.

Q: Are both parts suitable for the full -55°C to 100°C temperature range?

A: Yes. Both the TCLT1108 and HCPL-181-06BE are rated for -55°C to 100°C operating temperature, ensuring equivalent thermal performance across industrial and extended temperature applications.

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