TCET1600 Equivalent & Substitute Parts

Part Overview

The TCET1600 is a high-voltage optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. This component provides 5300Vrms isolation in a 4-DIP package and is designed for AC/DC input applications requiring galvanic isolation. The part is currently in Last Time Buy status, making identification of functionally equivalent alternatives essential for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	TCET1600
Manufacturer	Vishay Semiconductor Opto Division
Category	Optoisolators
Package / Case	4-DIP (0.300", 7.62mm)
Number of Channels	1
Voltage - Isolation	5300Vrms
Output Type	Transistor
Input Type	AC, DC
Current - Output / Channel	50mA
Voltage - Output (Max)	70V
Operating Temperature	-55°C ~ 100°C
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the TCET1600 is determined by the following critical parameters:

Package compatibility: 4-DIP (0.300", 7.62mm) form factor for direct PCB mounting
Isolation voltage: Minimum 5000Vrms to maintain system safety margins
Output configuration: Transistor output with single channel
Current capacity: 50mA output per channel
Input flexibility: AC and DC input support
Temperature range: Operating capability within -55°C to 100°C or compatible subset
Compliance: ROHS3 compliance and EAR99 classification

The identified substitute parts meet these core requirements while maintaining functional equivalence for isolation, switching, and signal transfer applications.

Parameter Comparison

Parameter	TCET1600	SFH628A-3X001	LTV-814
Manufacturer	Vishay Semiconductor Opto Division	Vishay Semiconductor Opto Division	Lite-On Inc.
Package / Case	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)
Number of Channels	1	1	1
Voltage - Isolation	5300Vrms	5300Vrms	5000Vrms
Output Type	Transistor	Transistor	Transistor
Input Type	AC, DC	AC, DC	AC, DC
Current - Output / Channel	50mA	50mA	50mA
Voltage - Output (Max)	70V	55V	35V
Current Transfer Ratio (Min)	20% @ 5mA	100% @ 1mA	20% @ 1mA
Current Transfer Ratio (Max)	300% @ 5mA	320% @ 1mA	300% @ 1mA
Turn On / Turn Off Time (Typ)	6µs, 5µs	6µs, 5.5µs	—
Rise / Fall Time (Typ)	3µs, 4.7µs	4.6µs, 5µs	4µs, 3µs
Vce Saturation (Max)	300mV	400mV	200mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-30°C ~ 110°C
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active

Engineering Selection Recommendations

SFH628A-3X001 (Vishay Semiconductor Opto Division) is the primary substitute option. It maintains identical isolation voltage (5300Vrms), package form factor, and operating temperature range. Both parts are manufactured by the same supplier, ensuring design continuity. The SFH628A-3X001 is in Active product status with higher inventory availability (4300 pcs), providing long-term supply security. Current transfer ratio performance is superior at 100% minimum versus 20% minimum for the TCET1600, supporting more predictable circuit behavior.

LTV-814 (Lite-On Inc.) serves as a secondary substitute for applications where isolation voltage can be reduced to 5000Vrms. This part offers the lowest Vce saturation (200mV) and extended upper operating temperature (110°C). The LTV-814 is in Active status with substantial inventory (57024 pcs), ensuring availability. Applications requiring the full 5300Vrms isolation specification should prioritize the SFH628A-3X001.

Both substitute parts maintain ROHS3 compliance, EAR99 classification, and 4-DIP through-hole mounting compatibility with the original TCET1600 design.

Frequently Asked Questions (FAQ)

Q: Can the SFH628A-3X001 directly replace the TCET1600 in existing designs?

A: Yes. Both parts share identical 4-DIP package dimensions, 5300Vrms isolation voltage, 50mA output current, and -55°C to 100°C operating temperature range. Pin configuration and functional behavior are compatible for direct substitution.

Q: What is the key difference between SFH628A-3X001 and LTV-814?

A: The primary difference is isolation voltage specification. SFH628A-3X001 maintains 5300Vrms isolation matching the TCET1600, while LTV-814 provides 5000Vrms isolation. Additionally, LTV-814 has lower maximum output voltage (35V versus 55V) and different Vce saturation characteristics (200mV versus 400mV). Select SFH628A-3X001 for applications requiring full 5300Vrms isolation.

Q: Are there temperature range considerations when substituting?

A: The TCET1600 and SFH628A-3X001 share identical operating temperature ranges (-55°C to 100°C). The LTV-814 extends to 110°C maximum, which may be beneficial for high-temperature applications but is not required for TCET1600 replacement. Verify application temperature requirements before selection.

Q: How do current transfer ratios affect circuit design?

A: Current transfer ratio determines the output current relative to input current. The SFH628A-3X001 specifies 100% minimum CTR at 1mA input, providing more consistent gain than the TCET1600's 20% minimum at 5mA. This affects input drive requirements and output current predictability. Circuit designs should account for these differences in bias calculations.

Q: Is the 4-DIP package the only available form factor for these substitutes?

A: Yes. All three parts (TCET1600, SFH628A-3X001, and LTV-814) are available exclusively in 4-DIP (0.300", 7.62mm) through-hole package configuration. No surface-mount alternatives are provided in this product family.

Q: What compliance certifications apply to all substitute options?

A: All three parts maintain ROHS3 compliance, are classified as EAR99 for export control, and carry REACH Unaffected status. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special handling requirements during storage or assembly.

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