TCET4100 Equivalent & Substitute Parts

Part Overview

The TCET4100 is a 4-channel optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. It provides 5000Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation. The device is classified as Last Time Buy, indicating discontinued production. Identifying equivalent substitute parts is necessary to ensure continued component availability for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Number of Channels	4
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Package / Case	16-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Operating Temperature	-55°C ~ 100°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TCET4100 is determined by the following critical parameters:

Channel Configuration: 4 channels required
Isolation Voltage: 5000Vrms minimum
Current Transfer Ratio: 50% (Min) @ 5mA and 600% (Max) @ 5mA
Output Type: Transistor output
Output Current: 50mA per channel
Package: 16-DIP (0.300", 7.62mm) through-hole
Compliance: ROHS3 compliant

The LTV-847 meets all critical substitution criteria. Both devices share identical channel count, isolation voltage, current transfer ratio specifications, output type, output current rating, and package configuration. Pin-to-pin compatibility is maintained through identical 16-DIP packaging.

Parameter Comparison

Parameter	TCET4100 (Vishay)	LTV-847 (Lite-On)	Compatibility
Number of Channels	4	4	Match
Voltage - Isolation	5000Vrms	5000Vrms	Match
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	Match
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	Match
Output Type	Transistor	Transistor	Match
Voltage - Output (Max)	70V	35V	LTV-847 lower rating
Current - Output / Channel	50mA	50mA	Match
Voltage - Forward (Vf) (Typ)	1.25V	1.2V	Comparable
Current - DC Forward (If) (Max)	60mA	50mA	TCET4100 higher rating
Vce Saturation (Max)	300mV	200mV	LTV-847 lower (better)
Operating Temperature	-55°C ~ 100°C	-30°C ~ 110°C	Overlapping range
Package / Case	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match

Engineering Selection Recommendations

The LTV-847 is the manufacturer-recommended substitute for the TCET4100. Both devices maintain identical electrical specifications for isolation voltage, channel count, current transfer ratio, and output current rating. The 16-DIP package configuration ensures direct pin-to-pin compatibility without PCB redesign.

The LTV-847 is classified as Active product status, ensuring ongoing availability and supply chain continuity. Both parts maintain ROHS3 compliance and equivalent regulatory certifications (REACH Unaffected, EAR99 ECCN classification).

Application-specific considerations: The TCET4100 supports maximum output voltage of 70V compared to the LTV-847 at 35V. Designs operating above 35V output voltage require the TCET4100 or alternative parts with equivalent voltage ratings. The LTV-847 demonstrates superior Vce saturation performance (200mV vs. 300mV), resulting in lower power dissipation in switching applications.

Frequently Asked Questions (FAQ)

Q: Can the LTV-847 directly replace the TCET4100 in existing designs?

A: Direct replacement is possible for applications where output voltage does not exceed 35V. The 16-DIP package configuration is identical, and all critical electrical parameters match. Applications requiring output voltages above 35V require alternative components.

Q: What are the key differences between these optoisolators?

A: The primary difference is maximum output voltage: TCET4100 supports 70V while LTV-847 supports 35V. The LTV-847 offers lower Vce saturation (200mV vs. 300mV) and slightly lower forward current rating (50mA vs. 60mA). Operating temperature ranges differ slightly but overlap across standard industrial conditions.

Q: Are both parts pin-compatible?

A: Yes. Both devices use 16-DIP (0.300", 7.62mm) through-hole packaging with identical pinout configuration, enabling direct PCB substitution without layout modifications.

Q: What is the product status difference?

A: The TCET4100 is Last Time Buy (discontinued), while the LTV-847 is Active (current production). The LTV-847 provides assured long-term availability for new designs and production continuity.

Q: Do both parts meet the same compliance standards?

A: Yes. Both TCET4100 and LTV-847 are ROHS3 compliant, REACH unaffected, and classified under EAR99 ECCN. Moisture sensitivity level is 1 (Unlimited) for both devices.

Q: Which part should be selected for new designs?

A: The LTV-847 is recommended for new designs due to Active product status and assured supply availability. The TCET4100 should be reserved for legacy system maintenance where output voltage requirements exceed 35V.

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