K817P Optoisolator Transistor Output - Equivalent & Substitute Parts

Part Overview

The K817P is a 5000Vrms optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The K817P operates as a single-channel optoisolator in a 4-DIP package, providing galvanic isolation for low-speed switching applications with a maximum output current of 50mA per channel.

Key Parameters

Parameter	K817P Specification
Voltage - Isolation	5000Vrms
Number of Channels	1
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Turn On / Turn Off Time (Typ)	6µs, 5µs
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Vce Saturation (Max)	300mV
Operating Temperature	-40°C ~ 100°C
Package / Case	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the K817P is determined by the following critical parameters:

Isolation voltage rating (minimum 5000Vrms)
Single-channel configuration
Transistor output type
4-DIP through-hole package format
Current transfer ratio range (50% to 600% @ 5mA)
Maximum output current (50mA per channel)
RoHS3 compliance

The substitute parts listed below meet these core requirements with variations in secondary performance characteristics such as switching speed, temperature range, and maximum output voltage.

Parameter Comparison

Parameter	K817P	VO617A	TCET1100	LTV-817
Manufacturer	Vishay Semiconductor Opto Division	Vishay Semiconductor Opto Division	Vishay Semiconductor Opto Division	Lite-On Inc.
Product Status	Obsolete	Active	Active	Active
Voltage - Isolation	5000Vrms	5300Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1	1
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA
Turn On / Turn Off Time (Typ)	6µs, 5µs	3µs, 2.3µs	6µs, 5µs	Not specified
Rise / Fall Time (Typ)	3µs, 4.7µs	2µs, 2µs	3µs, 4.7µs	4µs, 3µs
Output Type	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	70V	80V	70V	35V
Current - Output / Channel	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.25V	1.35V	1.25V	1.2V
Vce Saturation (Max)	300mV	400mV	300mV	200mV
Operating Temperature	-40°C ~ 100°C	-55°C ~ 110°C	-40°C ~ 100°C	-55°C ~ 110°C
Package / Case	4-DIP (0.300", 7.62mm)	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	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

VO617A is a direct manufacturer substitute from Vishay with enhanced isolation voltage (5300Vrms) and improved switching performance (3µs turn-on, 2.3µs turn-off). This part is active and maintains full RoHS3 compliance. The VO617A supports extended operating temperature range (-55°C to 110°C) and higher maximum output voltage (80V), making it suitable for applications requiring faster response times and broader thermal operation.

TCET1100 is a parametric equivalent from Vishay with identical electrical characteristics to the K817P, including matching isolation voltage (5000Vrms), switching times (6µs, 5µs), and output specifications. This part is active and REACH unaffected. The TCET1100 provides direct functional replacement with no performance trade-offs for standard operating conditions.

LTV-817 is a manufacturer-recommended substitute from Lite-On Inc. with equivalent isolation voltage (5000Vrms) and current transfer ratio specifications. This part is active and REACH unaffected. The LTV-817 features superior Vce saturation (200mV) and lower forward voltage (1.2V), but operates at reduced maximum output voltage (35V). Extended temperature range (-55°C to 110°C) is supported. Selection of this part requires verification that the 35V maximum output voltage meets application requirements.

All substitute parts maintain RoHS3 compliance and through-hole 4-DIP packaging compatibility with the K817P.

Frequently Asked Questions (FAQ)

Q: Can VO617A directly replace K817P in existing designs? A: Yes. VO617A maintains identical package format, channel count, and core electrical specifications. The enhanced isolation voltage and faster switching times are backward compatible. Verify that the 80V maximum output voltage does not exceed circuit requirements.

Q: What is the primary difference between TCET1100 and K817P? A: TCET1100 is electrically identical to K817P with matching isolation voltage, switching times, and output characteristics. The key difference is product status: TCET1100 is active while K817P is obsolete, making TCET1100 the preferred long-term supply source.

Q: Is LTV-817 suitable for high-voltage output applications? A: No. LTV-817 has a maximum output voltage of 35V, compared to 70V for K817P. Applications requiring output voltages above 35V must use K817P, VO617A, or TCET1100.

Q: Are all substitute parts available in the same packaging? A: Yes. All substitute parts use 4-DIP (0.300", 7.62mm) through-hole packaging, ensuring direct PCB compatibility with K817P.

Q: Which substitute offers the fastest switching performance? A: VO617A provides the fastest switching with 3µs turn-on and 2.3µs turn-off times, compared to 6µs and 5µs for K817P. TCET1100 and LTV-817 match or exceed K817P switching performance for standard applications.

Q: Do all substitutes support the same operating temperature range? A: No. K817P and TCET1100 operate from -40°C to 100°C. VO617A and LTV-817 support extended range from -55°C to 110°C, providing broader thermal operation capability.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed (VO617A, TCET1100, LTV-817) are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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