K817P4 Optoisolator Equivalent & Substitute Parts

Part Overview

The K817P4 is a 5000Vrms optoisolator with transistor output in 4-DIP packaging, manufactured by Vishay Semiconductor Opto Division. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The part provides galvanic isolation for low-speed switching applications with a single channel configuration and 50mA output current capability.

Key Parameters

Parameter	Value
Voltage - Isolation	5000Vrms
Number of Channels	1
Current Transfer Ratio (Min)	160% @ 10mA
Current Transfer Ratio (Max)	320% @ 10mA
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Package / Case	4-DIP (0.300", 7.62mm)
Operating Temperature	-40°C ~ 100°C
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the K817P4 is determined by the following critical parameters:

Voltage isolation rating of 5000Vrms or higher
Single channel transistor output configuration
4-DIP through-hole package with 0.300" (7.62mm) spacing
Current transfer ratio range of 160% to 320%
Maximum output voltage of 70V or higher
Output current capability of 50mA or higher
ROHS3 compliance and MSL Level 1 rating

Two substitute parts meet these criteria: VO617A-4 (manufacturer recommended) and TCET1204 (parametric equivalent). Both maintain electrical and mechanical compatibility with the K817P4 while offering active product status.

Parameter Comparison

Parameter	K817P4	VO617A-4	TCET1204
Voltage - Isolation	5000Vrms	5300Vrms	5000Vrms
Number of Channels	1	1	1
Current Transfer Ratio (Min)	160% @ 10mA	160% @ 5mA	160% @ 10mA
Current Transfer Ratio (Max)	320% @ 10mA	320% @ 5mA	320% @ 10mA
Turn On / Turn Off Time (Typ)	6µs, 5µs	3µs, 2.3µs	6µs, 5µs
Rise / Fall Time (Typ)	3µs, 4.7µs	2µs, 2µs	3µs, 4.7µs
Output Type	Transistor	Transistor	Transistor
Voltage - Output (Max)	70V	80V	70V
Current - Output / Channel	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.25V	1.35V	1.25V
Vce Saturation (Max)	300mV	400mV	300mV
Operating Temperature	-40°C ~ 100°C	-55°C ~ 110°C	-40°C ~ 100°C
Package / Case	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

VO617A-4 is the manufacturer-recommended substitute. It provides enhanced isolation voltage (5300Vrms vs. 5000Vrms), improved switching speed characteristics (3µs/2.3µs vs. 6µs/5µs), and an extended operating temperature range (-55°C to 110°C). The part maintains ROHS3 compliance and MSL Level 1 rating. The higher maximum output voltage (80V) and faster response times make this option suitable for applications requiring improved performance margins.

TCET1204 is a parametric equivalent that maintains identical electrical specifications to the K817P4, including isolation voltage, current transfer ratio at 10mA, switching times, and operating temperature range. This part is appropriate for direct replacement in existing designs where performance characteristics must remain unchanged. TCET1204 also carries ROHS3 compliance and MSL Level 1 rating with active product status.

Both substitutes are available in active production with significantly higher inventory levels than the obsolete K817P4, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can VO617A-4 be used as a direct replacement for K817P4?

A: Yes. VO617A-4 maintains the same 4-DIP package, single-channel transistor output, 50mA output current, and ROHS3 compliance. The enhanced isolation voltage and faster switching times are compatible with K817P4 applications. Pin configuration and package dimensions are identical.

Q: What is the difference between VO617A-4 and TCET1204?

A: VO617A-4 offers higher isolation voltage (5300Vrms vs. 5000Vrms), faster switching response (3µs/2.3µs vs. 6µs/5µs), and extended temperature range (-55°C to 110°C vs. -40°C to 100°C). TCET1204 provides identical electrical performance to K817P4. Selection depends on whether enhanced performance or specification matching is required.

Q: Are both substitutes compatible with existing PCB layouts designed for K817P4?

A: Yes. Both VO617A-4 and TCET1204 use the same 4-DIP (0.300", 7.62mm) through-hole package with identical pin spacing and configuration. No PCB modifications are required.

Q: Do the substitutes meet the same compliance requirements as K817P4?

A: Yes. Both VO617A-4 and TCET1204 are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the K817P4 compliance profile.

Q: Which substitute should be selected for new designs?

A: VO617A-4 is recommended for new designs due to its active product status, enhanced performance characteristics, and extended operating temperature range. TCET1204 is appropriate when exact specification matching to K817P4 is required.

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