K817P7 Optoisolator Transistor Output - Equivalent & Substitute Parts

Part Overview

The K817P7 is a 5000Vrms optoisolator with transistor output in 4-DIP packaging, manufactured by Vishay Semiconductor Opto Division. This component provides galvanic isolation for single-channel DC input applications with 50mA output current capability. The K817P7 is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production support.

Substiute Parts

K817P7

Vishay Semiconductor Opto DivisionIn Stock: 29335K817P7 Datasheet

Current PartRFQ

TCET1107

Vishay Semiconductor Opto DivisionIn Stock: 3151TCET1107 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the K817P7 is determined by strict equivalence across the following critical parameters:

• Isolation voltage rating: 5000Vrms minimum
• Single-channel configuration
• Transistor output topology
• Current transfer ratio range: 80% to 160% @ 5mA
• Maximum output voltage: 70V
• Maximum output current: 50mA
• Switching time characteristics: Turn on/off within 6µs/5µs
• 4-DIP package footprint and pinout compatibility
• Through-hole mounting configuration
• Operating temperature range: -40°C to +100°C minimum

The TCET1107 meets all specified parameters and maintains identical electrical and mechanical characteristics, qualifying it as a direct substitute for the obsolete K817P7.

Parameter Comparison

Engineering Selection Recommendations

The TCET1107 is the recommended substitute for the obsolete K817P7. Both components are manufactured by Vishay Semiconductor Opto Division and maintain identical electrical specifications, mechanical dimensions, and compliance certifications.

The TCET1107 offers the advantage of active product status, ensuring continued availability and manufacturing support. Both parts carry ROHS3 compliance and identical moisture sensitivity ratings, making them suitable for equivalent applications in isolation circuits requiring 5000Vrms galvanic separation with single-channel transistor output.

No design modifications are required when transitioning from K817P7 to TCET1107, as all critical parameters—isolation voltage, switching characteristics, output current capacity, and package footprint—are identical.

Frequently Asked Questions (FAQ)

Q: Can the TCET1107 be used as a direct replacement for K817P7 in existing designs?

A: Yes. The TCET1107 is electrically and mechanically identical to the K817P7. No circuit modifications or PCB layout changes are required. Both components share the same 4-DIP package footprint, pinout, and all electrical specifications.

Q: Why is the K817P7 listed as obsolete?

A: The K817P7 has been discontinued by Vishay Semiconductor Opto Division. The TCET1107 is the active equivalent part that maintains full compatibility with the original design specifications.

Q: Are there any compliance differences between K817P7 and TCET1107?

A: No. Both parts carry identical ROHS3 compliance, moisture sensitivity level 1 (unlimited), and ECCN/HTSUS classifications. They meet the same regulatory and environmental standards.

Q: What are the critical parameters for substitution in optoisolator selection?

A: For this product category, critical parameters include isolation voltage rating, number of channels, current transfer ratio range, output type (transistor vs. photodiode), maximum output voltage and current, switching time characteristics, operating temperature range, and package type. All these parameters must match between the original and substitute part.

Q: Is the 4-DIP package footprint identical between both parts?

A: Yes. Both K817P7 and TCET1107 use the 4-DIP package with 0.300" (7.62mm) spacing. They are pin-compatible and require no PCB modifications.

Q: What is the current transfer ratio specification, and why is it important?

A: The current transfer ratio (80% to 160% @ 5mA) defines the relationship between input LED current and output transistor current. This specification ensures predictable isolation performance and is identical between both parts, confirming functional equivalence.