TCET1108 Optoisolator Equivalent & Substitute Parts

Part Overview

The TCET1108 is a 5000Vrms optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. This single-channel, 4-DIP through-hole component is designed for galvanic isolation applications requiring high voltage isolation. The part is active and in production with 45,200 units currently in stock. Substitute parts are necessary to address supply chain flexibility, alternative sourcing requirements, or specific performance parameter needs within the allowed electrical and mechanical specifications for this optoisolator category.

Key Parameters

Parameter	Value
Manufacturer Part Number	TCET1108
Manufacturer	Vishay Semiconductor Opto Division
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Output Type	Transistor
Package / Case	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Operating Temperature	-40°C ~ 100°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the TCET1108 are qualified based on the following critical parameters that must remain constant across all alternatives:

Voltage - Isolation: 5000Vrms (mandatory match)
Number of Channels: 1 (mandatory match)
Output Type: Transistor (mandatory match)
Package / Case: 4-DIP (0.300", 7.62mm) (mandatory match)
Mounting Type: Through Hole (mandatory match)
Voltage - Output (Max): 70V (mandatory match)
Current - Output / Channel: 50mA (mandatory match)
Input Type: DC (mandatory match)

The following parameters are allowed to vary within the optoisolator category specifications:

Current Transfer Ratio (Min/Max): Variation permitted based on application requirements
Turn On / Turn Off Time: Variation permitted
Rise / Fall Time: Variation permitted
Voltage - Forward (Vf): Minor variation permitted (1.2V to 1.25V range)
Current - DC Forward (If) (Max): Variation permitted (50mA to 60mA range)
Vce Saturation (Max): Variation permitted (200mV to 300mV range)
Operating Temperature: Variation permitted within industrial range

All substitute parts listed are manufactured by Broadcom Limited under the HCPL-817 base product number series and maintain full compliance with RoHS3, REACH, and regulatory requirements.

Parameter Comparison

Parameter	TCET1108	HCPL-817-000E	HCPL-817-00AE	HCPL-817-00BE	HCPL-817-06BE	HCPL-817-06CE	HCPL-817-06LE
Manufacturer	Vishay	Broadcom	Broadcom	Broadcom	Broadcom	Broadcom	Broadcom
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	130% @ 5mA	50% @ 5mA	80% @ 5mA	130% @ 5mA	130% @ 5mA	200% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	260% @ 5mA	600% @ 5mA	160% @ 5mA	260% @ 5mA	260% @ 5mA	400% @ 5mA	100% @ 5mA
Rise / Fall Time (Typ)	3µs, 4.7µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
Voltage - Output (Max)	70V	70V	70V	70V	70V	70V	70V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.25V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	60mA	50mA	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	300mV	200mV	200mV	200mV	200mV	200mV	200mV
Operating Temperature	-40°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 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)
Mounting Type	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
Product Status	Active	Active	Active	Active	Active	Active	Active
Inventory (Pcs)	45,200	3,279	20,300	35,400	2,070	2,300	27,841

Engineering Selection Recommendations

All substitute parts maintain active product status and full compliance with RoHS3 and REACH regulations. Selection among the HCPL-817 series alternatives depends on Current Transfer Ratio requirements:

HCPL-817-00BE: Matches the TCET1108 Current Transfer Ratio specification (130% min, 260% max @ 5mA) with the highest inventory availability (35,400 units) among Broadcom alternatives. This part provides direct electrical equivalence for applications requiring the specified CTR range.

HCPL-817-00AE: Suitable for applications tolerating lower Current Transfer Ratio (80% min, 160% max @ 5mA) with substantial inventory (20,300 units). Lower CTR may require circuit design adjustment.

HCPL-817-06CE: Provides elevated Current Transfer Ratio (200% min, 400% max @ 5mA) for applications requiring higher gain characteristics with limited inventory (2,300 units).

HCPL-817-000E: Offers wide Current Transfer Ratio range (50% min, 600% max @ 5mA) for flexible design implementations with lower inventory (3,279 units).

HCPL-817-06LE: Provides constrained Current Transfer Ratio (50% min, 100% max @ 5mA) for applications requiring lower gain with high inventory (27,841 units).

HCPL-817-06BE: Matches TCET1108 CTR specification (130% min, 260% max @ 5mA) with limited inventory (2,070 units).

All substitute parts operate within the -30°C to 100°C temperature range, which covers the TCET1108 lower temperature limit of -40°C. Applications requiring operation below -30°C must retain the TCET1108.

Frequently Asked Questions (FAQ)

Q: Can HCPL-817 series parts directly replace TCET1108 in existing PCB designs?

A: Yes, all HCPL-817 substitute parts share identical 4-DIP (0.300", 7.62mm) through-hole package geometry and pinout compatibility. Direct PCB substitution is mechanically and electrically feasible for the specified parameters.

Q: What is the primary difference between HCPL-817-00BE and HCPL-817-00AE?

A: The primary difference is Current Transfer Ratio specification. HCPL-817-00BE maintains 130% minimum CTR matching the TCET1108, while HCPL-817-00AE provides 80% minimum CTR. Circuit designs dependent on minimum CTR performance must account for this variation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all HCPL-817 series substitute parts listed are ROHS3 Compliant and REACH Unaffected, matching the TCET1108 regulatory status.

Q: What is the temperature operating range difference?

A: The TCET1108 operates from -40°C to 100°C, while all HCPL-817 substitutes operate from -30°C to 100°C. Applications requiring operation below -30°C must use the TCET1108.

Q: Which substitute part offers the closest electrical match to TCET1108?

A: HCPL-817-00BE and HCPL-817-06BE both match the TCET1108 Current Transfer Ratio specification (130% min, 260% max @ 5mA). HCPL-817-00BE offers superior inventory availability (35,400 units versus 2,070 units).

Q: How do Vce Saturation differences affect circuit performance?

A: The TCET1108 specifies 300mV maximum Vce Saturation, while all HCPL-817 substitutes specify 200mV maximum. Lower saturation voltage in substitutes results in reduced output voltage drop and improved output current capability in saturated switching applications.

Q: Can I use HCPL-817-06LE if my application allows lower Current Transfer Ratio?

A: Yes, HCPL-817-06LE is electrically compatible with 50% minimum and 100% maximum CTR @ 5mA. Circuit designs must accommodate the lower gain characteristics. This part offers the highest inventory availability (27,841 units) among lower-CTR options.

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