TCET1109 Optoisolator Equivalent & Substitute Parts

Part Overview

The TCET1109 is a 5000Vrms optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. This single-channel, 4-DIP packaged component is designed for DC input applications requiring galvanic isolation in industrial and consumer electronics. The part is currently active in production with 35,300 units 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	TCET1109
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 TCET1109 are qualified based on the following critical parameters that must remain constant across all alternatives:

Isolation Voltage: 5000Vrms (mandatory match)
Package Type: 4-DIP (0.300", 7.62mm) through-hole (mandatory match)
Output Configuration: Transistor output, single channel (mandatory match)
Input Type: DC (mandatory match)
Maximum Output Voltage: 70V (mandatory match)
Maximum Output Current: 50mA per channel (mandatory match)
Mounting Type: Through Hole (mandatory match)
RoHS Compliance: ROHS3 Compliant (mandatory match)

All five substitute parts—HCPL-817-000E, HCPL-817-00AE, HCPL-817-00BE, HCPL-817-06BE, HCPL-817-06CE, and HCPL-817-06LE—manufactured by Broadcom Limited, meet these mandatory electrical and mechanical requirements. Variations in Current Transfer Ratio (CTR), forward voltage, and saturation voltage are within acceptable ranges for this component category and do not prevent functional substitution.

Parameter Comparison

Parameter	TCET1109	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
Number of Channels	1	1	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	200% @ 5mA	50% @ 5mA	80% @ 5mA	130% @ 5mA	130% @ 5mA	200% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	400% @ 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
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

Engineering Selection Recommendations

All substitute parts are active products with ROHS3 compliance and REACH unaffected status, matching the regulatory and environmental requirements of the TCET1109. Selection among the Broadcom HCPL-817 series variants should be based on Current Transfer Ratio requirements specific to the application circuit:

HCPL-817-06CE and HCPL-817-000E provide the widest CTR ranges (200-400% and 50-600% respectively), suitable for applications requiring broad gain tolerance.
HCPL-817-00BE and HCPL-817-06BE offer mid-range CTR (130-260%), appropriate for standard isolation applications.
HCPL-817-00AE provides narrower CTR (80-160%), suitable for applications requiring tighter gain control.
HCPL-817-06LE offers the lowest CTR range (50-100%), for applications with specific low-gain requirements.

All variants maintain identical isolation voltage, package geometry, output voltage/current ratings, and compliance certifications. Operating temperature range for Broadcom variants extends to -30°C minimum, compared to -40°C for the TCET1109; applications requiring operation below -30°C must retain the original TCET1109.

Frequently Asked Questions (FAQ)

Q: Can HCPL-817 series parts directly replace TCET1109 in existing PCB designs?

A: Yes. All HCPL-817 variants share identical 4-DIP package geometry (0.300", 7.62mm), through-hole mounting, pin configuration, and electrical ratings (5000Vrms isolation, 70V max output, 50mA max output current). Direct pin-for-pin substitution is mechanically and electrically compatible.

Q: What is the significance of the CTR (Current Transfer Ratio) differences between variants?

A: CTR determines the output current relative to input current. Higher CTR means greater output current for the same input current. The TCET1109 specifies 200-400% CTR. Broadcom variants range from 50-600% CTR depending on the suffix. Circuit design must account for the specific CTR of the selected part to ensure proper output drive levels. Lower CTR variants require higher input current to achieve equivalent output; higher CTR variants provide greater output for the same input.

Q: Are there temperature range limitations when substituting?

A: The TCET1109 operates from -40°C to 100°C. All Broadcom HCPL-817 substitutes operate from -30°C to 100°C. Applications requiring operation below -30°C must use the original TCET1109. Applications within the -30°C to 100°C range are compatible with all substitutes.

Q: Do all substitute parts meet the same regulatory and compliance standards?

A: Yes. All HCPL-817 variants are ROHS3 compliant, REACH unaffected, and carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications as the TCET1109.

Q: What are the differences in Vce saturation voltage?

A: The TCET1109 specifies 300mV maximum Vce saturation, while all Broadcom HCPL-817 variants specify 200mV maximum. Lower saturation voltage in the Broadcom parts results in reduced power dissipation in the output transistor, which may improve circuit efficiency. This difference is not a substitution barrier and is generally favorable for thermal performance.

Q: How do forward voltage differences affect circuit design?

A: The TCET1109 specifies 1.25V typical forward voltage; all Broadcom variants specify 1.2V typical. This 50mV difference is negligible for most circuit designs and does not require redesign. Input current calculations should use the specified forward voltage for each part.

Q: Are packaging options different between the main part and substitutes?

A: The TCET1109 is supplied in Tube packaging. Most Broadcom HCPL-817 variants are also supplied in Tube packaging. HCPL-817-06BE shows packaging listed as "-" (not specified in available data). Confirm packaging requirements with the supplier before procurement.

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