TCET1105 Optoisolator Equivalent & Substitute Parts

Part Overview

The TCET1105 is a 5000Vrms isolation optoisolator with transistor output in 4-DIP packaging, manufactured by Vishay Semiconductor Opto Division. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The TCET1105 provides single-channel isolation with 50mA output current capability and operates across the -40°C to 100°C temperature range. Direct equivalents and cross-compatible alternatives from active product lines ensure design continuity and supply chain reliability.

Key Parameters

Parameter	TCET1105 Specification
Isolation Voltage	5000Vrms
Number of Channels	1
Output Type	Transistor
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Maximum Output Voltage	70V
Output Current per Channel	50mA
Vce Saturation (Max)	300mV
Operating Temperature Range	-40°C to 100°C
Package / Case	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TCET1105 is determined by strict equivalence across the following critical parameters:

Isolation Voltage: All substitutes must maintain 5000Vrms isolation rating
Package / Case: All substitutes must use 4-DIP (0.300", 7.62mm) through-hole configuration
Output Type: All substitutes must provide transistor output with single channel
Maximum Output Voltage & Current: All substitutes must support 70V maximum output and 50mA per channel
Operating Temperature Range: Substitutes must cover the required temperature envelope
Input Type: All substitutes must accept DC input

The TCET1100 (Vishay, Active) is a parametric equivalent with identical electrical specifications. The HCPL-817 series (Broadcom, Active) provides cross-manufacturer alternatives with equivalent isolation, package, and output characteristics. Substitutes within the HCPL-817 family differ in Current Transfer Ratio grades, allowing selection based on specific circuit requirements while maintaining full electrical and mechanical compatibility.

Parameter Comparison

Parameter	TCET1105	TCET1100	HCPL-817-000E	HCPL-817-00AE	HCPL-817-00BE	HCPL-817-00CE	HCPL-817-00DE	HCPL-817-00LE	HCPL-817-060E	HCPL-817-06AE	HCPL-817-06BE
Manufacturer	Vishay	Vishay	Broadcom	Broadcom	Broadcom	Broadcom	Broadcom	Broadcom	Broadcom	Broadcom	Broadcom
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
Isolation Voltage	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	80% @ 5mA	130% @ 5mA	200% @ 5mA	300% @ 5mA	50% @ 5mA	50% @ 5mA	80% @ 5mA	130% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	160% @ 5mA	260% @ 5mA	400% @ 5mA	600% @ 5mA	100% @ 5mA	600% @ 5mA	160% @ 5mA	260% @ 5mA
Maximum Output Voltage	70V	70V	70V	70V	70V	70V	70V	70V	70V	70V	70V
Output Current per Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	300mV	300mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV
Operating Temperature Range	-40°C to 100°C	-40°C to 100°C	-30°C to 100°C	-30°C to 100°C	-30°C to 100°C	-30°C to 100°C	-30°C to 100°C	-30°C to 100°C	-30°C to 100°C	-30°C to 100°C	-30°C to 100°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)	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)	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: TCET1100

The TCET1100 is the direct parametric equivalent from Vishay Semiconductor Opto Division. It maintains identical electrical specifications including Current Transfer Ratio range (50% to 600% @ 5mA), Vce saturation (300mV), and operating temperature range (-40°C to 100°C). As an active product with ROHS3 compliance, the TCET1100 provides the most direct replacement path for TCET1105 applications.

Cross-Manufacturer Alternatives: HCPL-817 Series (Broadcom)

The HCPL-817 family offers active, ROHS3-compliant alternatives with equivalent isolation voltage, package, and output characteristics. Selection within this family depends on Current Transfer Ratio requirements:

HCPL-817-000E, HCPL-817-060E: 50% to 600% CTR range, matching TCET1105 specification envelope
HCPL-817-00LE: 50% to 100% CTR range, for lower CTR applications
HCPL-817-00AE, HCPL-817-06AE: 80% to 160% CTR range
HCPL-817-00BE, HCPL-817-06BE: 130% to 260% CTR range
HCPL-817-00CE: 200% to 400% CTR range

All HCPL-817 variants feature improved Vce saturation (200mV versus 300mV on TCET1105), reducing power dissipation. Operating temperature range is -30°C to 100°C, which covers most applications within the TCET1105 envelope except those requiring operation below -30°C.

Frequently Asked Questions (FAQ)

Q: Can HCPL-817 series parts directly replace TCET1105 in existing designs?

A: Yes, for applications operating above -30°C. All HCPL-817 variants maintain identical isolation voltage (5000Vrms), package (4-DIP through-hole), output type (transistor), maximum output voltage (70V), and output current (50mA). The primary difference is operating temperature range: HCPL-817 parts operate from -30°C to 100°C, while TCET1105 operates from -40°C to 100°C. If your application requires operation below -30°C, use TCET1100 instead.

Q: What is the difference between HCPL-817-000E and HCPL-817-00DE?

A: Both parts are electrically and mechanically identical except for Current Transfer Ratio specification. HCPL-817-000E has a CTR range of 50% to 600% @ 5mA, while HCPL-817-00DE has a CTR range of 300% to 600% @ 5mA. The HCPL-817-00DE is specified for higher CTR performance. Select based on your circuit's input current and required output current characteristics.

Q: Are there any compliance or certification differences between substitutes?

A: All listed substitutes are ROHS3 compliant, REACH unaffected, and carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications. No compliance barriers exist for cross-substitution.

Q: Does the improved Vce saturation (200mV on HCPL-817 versus 300mV on TCET1105) affect circuit design?

A: The lower Vce saturation on HCPL-817 parts reduces output voltage drop and power dissipation in the transistor output stage. This is a beneficial characteristic that improves efficiency. No circuit redesign is required; the HCPL-817 will perform identically or better in the same application.

Q: Which substitute should I choose for new designs?

A: For new designs, use HCPL-817-000E or HCPL-817-060E if your application operates above -30°C. These parts offer the widest CTR range (50% to 600%), matching the TCET1105 specification envelope, with active product status and superior availability. If operation below -30°C is required, use TCET1100.

Q: Can I mix different HCPL-817 CTR grades in the same design?

A: Yes, provided your circuit design accounts for the specific CTR range of each part. Different CTR grades are electrically and mechanically interchangeable; selection should be based on input current availability and required output current for each isolation channel in your application.

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