SFH600-1 Equivalent & Substitute Parts

Part Overview

The SFH600-1 is a 6-DIP optoisolator transistor with base output manufactured by Vishay Semiconductor Opto Division. It provides 5300Vrms isolation with a single channel, designed for DC input applications requiring galvanic isolation. The part is currently in Last Time Buy status with 2189 units in stock. Due to its discontinuation trajectory, identifying functionally equivalent alternatives is essential for design continuity and long-term supply chain planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	SFH600-1
Manufacturer	Vishay Semiconductor Opto Division
Category	Optoisolators
Package / Case	6-DIP (0.300", 7.62mm)
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min / Max)	63% / 125% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SFH600-1 is determined by the following critical parameters:

Package compatibility: 6-DIP (0.300", 7.62mm) form factor for direct PCB replacement
Isolation voltage: Minimum 5000Vrms to maintain system safety margins
Output type: Transistor with base configuration for circuit interface compatibility
Current transfer ratio range: Acceptable range 40% to 200% @ 10mA to ensure signal integrity
Maximum output voltage: 70V or higher to support application requirements
Output current capability: 50mA or higher per channel
Operating temperature range: -55°C to 100°C minimum
Compliance: ROHS3 compliant, MSL 1 rating

Substitute parts are grouped into three categories based on current transfer ratio performance:

Group 1 (63-125% CTR): SFH601-2, CNY17-2-000E — Direct functional equivalents with matching CTR specifications Group 2 (40-80% CTR): CNY17-1, CNY17-1X — Lower CTR performance, suitable for applications with higher input signal margins Group 3 (100-320% CTR): CNY17-3, CNY17-3X, CNY17-4, CNY17-4X, CNY17-5, CNY17-5X — Higher CTR performance for applications requiring enhanced signal sensitivity

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min / Max @ 10mA	Output Type	Vout (Max)	Iout / Channel	Vce Sat (Max)	Temp Range	Package	Status
SFH600-1	Vishay	5300Vrms	63% / 125%	Transistor w/ Base	70V	50mA	400mV	-55 to 100°C	6-DIP	Last Time Buy
SFH601-2	Vishay	5300Vrms	63% / 125%	Transistor w/ Base	100V	50mA	400mV	-55 to 100°C	6-DIP	Active
CNY17-1	Lite-On	5000Vrms	40% / 80%	Transistor w/ Base	70V	150mA	300mV	-55 to 100°C	6-DIP	Active
CNY17-1X	Isocom	5300Vrms	40% / 80%	Transistor w/ Base	70V	50mA	400mV	-55 to 100°C	6-DIP	Active
CNY17-2-000E	Broadcom	5000Vrms	63% / 125%	Transistor w/ Base	70V	150mA	300mV	-55 to 100°C	6-DIP	Active
CNY17-3	Quality Technologies	Not specified	100% @ 10mA	Transistor w/ Base	70V	Not specified	Not specified	Not specified	6-DIP	Active
CNY17-3X	Isocom	5300Vrms	100% / 200%	Transistor w/ Base	70V	50mA	400mV	-55 to 100°C	6-DIP	Active
CNY17-4	Lite-On	5000Vrms	160% / 320%	Transistor w/ Base	70V	150mA	300mV	-55 to 100°C	6-DIP	Active
CNY17-4X	Isocom	5300Vrms	160% / 320%	Transistor w/ Base	70V	50mA	400mV	-55 to 100°C	6-DIP	Active
CNY17-5	Isocom	5300Vrms	200% / 400%	Transistor	70V	50mA	400mV	-55 to 100°C	6-DIP	Active
CNY17-5X	Isocom	5300Vrms	200% / 400%	Transistor w/ Base	70V	50mA	400mV	-55 to 100°C	6-DIP	Active

Engineering Selection Recommendations

Primary Recommendation: SFH601-2

SFH601-2 is the preferred substitute. It maintains identical electrical specifications to SFH600-1 (63-125% CTR, 5300Vrms isolation, 400mV Vce saturation) while offering higher maximum output voltage (100V vs 70V). Both parts are manufactured by Vishay Semiconductor Opto Division, ensuring consistent design and quality standards. SFH601-2 is in Active product status with 16,627 units in stock, providing supply security. ROHS3 compliance and MSL 1 rating are maintained.

Secondary Recommendation: CNY17-2-000E

CNY17-2-000E (Broadcom) provides matching CTR specifications (63-125% @ 10mA) and 5000Vrms isolation. It offers higher output current capability (150mA vs 50mA) and lower Vce saturation (300mV vs 400mV), which may improve switching performance in some applications. Active status with 8,275 units in stock. Isolation voltage is 300Vrms lower than SFH600-1; verify application requirements before selection.

Alternative for Higher Current Applications: CNY17-1

CNY17-1 (Lite-On) supports 150mA output current and lower Vce saturation (300mV). Current transfer ratio is lower (40-80% @ 10mA), requiring higher input signal levels. Isolation voltage is 5000Vrms. Suitable only for applications where lower CTR is acceptable and higher output current is required. 48,700 units in stock.

Alternative for Enhanced Signal Sensitivity: CNY17-3X, CNY17-4X, CNY17-5X

These Isocom parts offer higher current transfer ratios (100-400% @ 10mA) for applications requiring maximum signal sensitivity. All maintain 5300Vrms isolation, 50mA output current, and 400mV Vce saturation. Select based on specific CTR requirement: CNY17-3X (100-200%), CNY17-4X (160-320%), or CNY17-5X (200-400% with base output). All are in Active status.

Not Recommended: CNY17-3

CNY17-3 (Quality Technologies) lacks complete electrical specifications (isolation voltage, output current, Vce saturation not specified). Insufficient data for reliable substitution decision.

Frequently Asked Questions (FAQ)

Q: Can SFH600-1 be directly replaced with SFH601-2 without circuit modification?

A: Yes. Both parts share identical package (6-DIP), isolation voltage (5300Vrms), current transfer ratio (63-125% @ 10mA), output type (transistor with base), and operating temperature range (-55°C to 100°C). Pin-for-pin compatibility is maintained. The higher maximum output voltage of SFH601-2 (100V vs 70V) provides additional design margin without requiring circuit changes.

Q: What is the significance of current transfer ratio (CTR) in optoisolator selection?

A: CTR determines the ratio of output current to input current. SFH600-1 has 63-125% CTR, meaning output current is 63-125% of input current at 10mA input. Lower CTR parts (40-80%) require higher input signals to achieve the same output. Higher CTR parts (100-400%) provide greater signal sensitivity. Select based on your input signal levels and required output current.

Q: Is CNY17-1 a suitable replacement if my application requires higher output current?

A: CNY17-1 supports 150mA output current versus SFH600-1's 50mA, making it suitable for higher current applications. However, its lower CTR (40-80% vs 63-125%) requires higher input signal levels. Isolation voltage is 5000Vrms (300Vrms lower than SFH600-1). Verify that your input signal levels can accommodate the lower CTR and that 5000Vrms isolation meets your safety requirements.

Q: What is the difference between "Transistor" and "Transistor with Base" output types?

A: Both configurations provide transistor output for switching applications. "Transistor with Base" includes an accessible base pin for additional circuit control options, while standard "Transistor" output does not. SFH600-1 features transistor with base output. CNY17-5 offers transistor output without base access; CNY17-5X provides transistor with base. Verify your circuit design requires base access before selecting CNY17-5.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching SFH600-1 environmental and regulatory requirements.

Q: Which substitute offers the best supply availability?

A: CNY17-3 (Quality Technologies) has the highest inventory at 94,700 units, followed by CNY17-4 (Lite-On) at 89,800 units. However, CNY17-3 lacks complete electrical specifications. For fully specified parts with high availability, CNY17-4 (89,800 units) and CNY17-1 (48,700 units) are preferred options.

Q: Can I use CNY17-4X as a direct replacement for SFH600-1?

A: CNY17-4X is pin-compatible (6-DIP package) and maintains 5300Vrms isolation, 50mA output current, and 400mV Vce saturation. However, its higher CTR (160-320% vs 63-125%) means it will produce higher output current for the same input signal. This may require input signal adjustment or circuit redesign. Use only if your application can accommodate higher signal sensitivity or if you intentionally require enhanced output current.

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