K817P8 Optoisolator Transistor Output - Equivalent & Substitute Parts

Part Overview

The K817P8 is a 5000Vrms optoisolator with transistor output, manufactured by Vishay Semiconductor Opto Division. This component provides galvanic isolation for single-channel DC input applications with a 4-DIP through-hole package. The K817P8 is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production support. Substitute parts must maintain identical electrical isolation, switching characteristics, and mechanical compatibility to ensure direct board-level replacement without circuit redesign.

Substiute Parts

K817P8

Vishay Semiconductor Opto DivisionIn Stock: 3488K817P8 Datasheet

Current PartRFQ

TCET1108

Vishay Semiconductor Opto DivisionIn Stock: 45237TCET1108 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the K817P8 must satisfy the following mandatory electrical and mechanical criteria:

• Voltage isolation rating of 5000Vrms minimum
• Single-channel configuration
• Current transfer ratio range: 130% to 260% @ 5mA
• Transistor output type with maximum output voltage of 70V
• Output current capability of 50mA per channel
• Vce saturation maximum of 300mV
• 4-DIP through-hole package (0.300", 7.62mm)
• Operating temperature range of -40°C to 100°C

The TCET1108 meets all specified parameters and is the manufacturer-recommended substitute. It maintains identical electrical performance while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The TCET1108 is the direct equivalent for K817P8 applications. Both parts are manufactured by Vishay Semiconductor Opto Division and share identical electrical specifications and package geometry. The TCET1108 offers the advantage of active product status, ensuring long-term availability and supply chain continuity. Both parts maintain ROHS3 compliance and MSL Level 1 rating, supporting deployment in standard manufacturing environments without moisture-related constraints.

For applications currently using K817P8, transition to TCET1108 requires no circuit modifications, PCB layout changes, or firmware adjustments. Pin configuration, electrical performance, and thermal characteristics remain unchanged.

Frequently Asked Questions (FAQ)

Q: Can TCET1108 replace K817P8 in existing designs?

A: Yes. The TCET1108 is a direct pin-for-pin and functionally equivalent substitute. All electrical parameters, package dimensions, and mounting specifications are identical. No design changes are required.

Q: What is the primary reason to substitute K817P8 with TCET1108?

A: The K817P8 is classified as obsolete. The TCET1108 is an active product with established supply availability, making it the recommended choice for new designs and production continuity.

Q: Are there differences in packaging or handling between K817P8 and TCET1108?

A: Both parts use 4-DIP through-hole packaging with identical dimensions (0.300", 7.62mm). Both maintain MSL Level 1 rating, requiring no special moisture control during storage or handling.

Q: Do the switching characteristics differ between these parts?

A: No. Turn-on/turn-off times (6µs, 5µs) and rise/fall times (3µs, 4.7µs) are identical. Current transfer ratio specifications (130% to 260% @ 5mA) and output saturation voltage (300mV max) are matched.

Q: What compliance certifications apply to TCET1108?

A: TCET1108 is ROHS3 compliant and carries REACH Unaffected status. Both certifications align with K817P8 compliance requirements.

Q: Is TCET1108 suitable for -40°C to 100°C operating temperature applications?

A: Yes. TCET1108 maintains the full -40°C to 100°C operating temperature range specified for K817P8.