SFH600-3 Equivalent & Substitute Parts

Part Overview

The SFH600-3 is a high-isolation optoisolator transistor manufactured by Vishay Semiconductor Opto Division, rated for 5300Vrms isolation voltage with transistor output including base connection. This component is classified as Last Time Buy, indicating limited availability from the original manufacturer. Substitute parts are necessary to ensure design continuity and long-term supply chain reliability for applications requiring equivalent isolation performance and switching characteristics in 6-DIP through-hole packages.

Key Parameters

Parameter	Value
Manufacturer Part Number	SFH600-3
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)	160% @ 10mA
Current Transfer Ratio (Max)	320% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Operating Temperature	-55°C ~ 100°C
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SFH600-3 are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Package / Case: 6-DIP (0.300", 7.62mm) — ensures mechanical and electrical compatibility
Number of Channels: 1 — maintains single-channel isolation architecture
Output Type: Transistor with Base — preserves base-driven output configuration
Voltage - Isolation: 5300Vrms or 5000Vrms — maintains high-voltage isolation capability
Current Transfer Ratio range: 160-320% @ 10mA or equivalent performance band
Operating Temperature: -55°C ~ 100°C — ensures thermal compatibility
Mounting Type: Through Hole — maintains PCB assembly compatibility

Grouping Logic:

Group A (Direct Equivalents - 5300Vrms Isolation, 160-320% CTR):

CNY17-1X (Isocom) — matches isolation voltage and CTR range exactly
CNY17-3X (Isocom) — matches isolation voltage; CTR range 100-200% (subset of SFH600-3)

Group B (High-Performance Alternatives - 5300Vrms Isolation, Extended CTR):

CNY17-5 (Isocom) — 5300Vrms isolation; CTR 200-400% (exceeds SFH600-3 performance)
CNY17-5X (Isocom) — 5300Vrms isolation with base output; CTR 200-400%

Group C (Lower Isolation Alternatives - 5000Vrms Isolation, 160-320% CTR):

CNY17-4-000E (Broadcom) — 5000Vrms isolation; CTR 160-320% (matches SFH600-3 CTR exactly)

Group D (Reduced Performance Alternatives - 5000Vrms Isolation, Lower CTR):

CNY17-1 (Lite-On) — 5000Vrms isolation; CTR 40-80%
CNY17-2 (Lite-On) — 5000Vrms isolation; CTR 63-125%
CNY17-2X (Isocom) — 5300Vrms isolation; CTR 63-125%

Group E (Incomplete Specification):

CNY17-3 (Quality Technologies) — insufficient parameter data for full equivalence determination

Parameter Comparison

Part Number	Manufacturer	Voltage - Isolation	CTR Min @ 10mA	CTR Max @ 10mA	Output Type	Current - Output	Vce Sat (Max)	Turn On/Off Time	Product Status
SFH600-3	Vishay	5300Vrms	160%	320%	Transistor w/ Base	50mA	400mV	3.2µs, 3µs	Last Time Buy
CNY17-1X	Isocom	5300Vrms	40%	80%	Transistor w/ Base	50mA	400mV	3µs, 2.3µs	Active
CNY17-2X	Isocom	5300Vrms	63%	125%	Transistor w/ Base	50mA	400mV	3µs, 2.3µs	Active
CNY17-3X	Isocom	5300Vrms	100%	200%	Transistor w/ Base	50mA	400mV	3µs, 2.3µs	Active
CNY17-4-000E	Broadcom	5000Vrms	160%	320%	Transistor w/ Base	150mA	300mV	—	Active
CNY17-5X	Isocom	5300Vrms	200%	400%	Transistor w/ Base	50mA	400mV	3µs, 2.3µs	Active
CNY17-1	Lite-On	5000Vrms	40%	80%	Transistor w/ Base	150mA	300mV	—	Active
CNY17-2	Lite-On	5000Vrms	63%	125%	Transistor w/ Base	150mA	300mV	—	Active
H11AV1	Isocom	7.5Vpk	100%	300%	Transistor w/ Base	50mA	400mV	—	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status, Full Compliance):

CNY17-3X and CNY17-5X are the preferred substitutes. Both are manufactured by Isocom Components 2004 LTD with Active product status, ensuring ongoing availability. Both maintain 5300Vrms isolation voltage matching the SFH600-3, preserve the 6-DIP through-hole package, and support transistor-with-base output configuration. CNY17-3X provides CTR performance within the SFH600-3 range (100-200%), while CNY17-5X offers extended CTR (200-400%) for applications requiring higher gain margin. Both are ROHS3 compliant and carry MSL 1 rating.

Secondary Substitutes (Active Status, Reduced Isolation):

CNY17-4-000E (Broadcom Limited) maintains identical CTR performance (160-320% @ 10mA) and Active product status but operates at 5000Vrms isolation. This represents a 300Vrms reduction from the SFH600-3 specification. Selection is appropriate only when application isolation requirements do not mandate 5300Vrms. The part offers higher output current capability (150mA vs. 50mA) and lower saturation voltage (300mV vs. 400mV).

Tertiary Substitutes (Active Status, Reduced Performance):

CNY17-1X, CNY17-2X, and CNY17-2 maintain 5300Vrms or 5000Vrms isolation but provide reduced CTR performance (40-125% @ 10mA). These are suitable only for applications where lower gain is acceptable or where input current can be increased to compensate for reduced transfer ratio.

Not Recommended:

H11AV1 operates at 7.5Vpk isolation voltage, which is insufficient for high-voltage isolation applications and represents a fundamental specification mismatch.

CNY17-3 (Quality Technologies) lacks sufficient parameter documentation for engineering selection.

Frequently Asked Questions (FAQ)

Q: Can CNY17-3X directly replace SFH600-3 in existing designs?

A: Yes, CNY17-3X is a direct mechanical and functional replacement. Both use 6-DIP through-hole packaging, support single-channel isolation with transistor-with-base output, and operate across -55°C to 100°C. The 5300Vrms isolation voltage matches exactly. CTR performance of CNY17-3X (100-200% @ 10mA) is a subset of SFH600-3 (160-320% @ 10mA), meaning designs relying on the full upper CTR range of SFH600-3 may require input current adjustment.

Q: What is the difference between CNY17-5X and CNY17-3X?

A: Both maintain identical package, isolation voltage, and output type. The primary difference is Current Transfer Ratio: CNY17-5X provides 200-400% @ 10mA, while CNY17-3X provides 100-200% @ 10mA. CNY17-5X offers higher gain, reducing required input current for equivalent output performance. Selection depends on circuit design margins and input current availability.

Q: Why does CNY17-4-000E have higher output current (150mA vs. 50mA)?

A: CNY17-4-000E is manufactured by Broadcom and features a different internal transistor design optimized for higher output current capability. However, it operates at 5000Vrms isolation rather than 5300Vrms. This trade-off is acceptable only when application isolation requirements permit the lower voltage rating.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts carry ROHS3 compliance certification. All are also MSL 1 rated (Unlimited moisture sensitivity level) and REACH Unaffected, matching the SFH600-3 environmental and regulatory status.

Q: Can I use CNY17-1 or CNY17-2 as substitutes?

A: These parts are mechanically compatible (6-DIP package, through-hole mounting) but provide significantly reduced CTR performance (40-125% @ 10mA vs. 160-320% @ 10mA). They also operate at 5000Vrms isolation. Use only if circuit design can accommodate lower gain and reduced isolation voltage, or if input current can be substantially increased to compensate for lower transfer ratio.

Q: What does "Last Time Buy" status mean for SFH600-3?

A: Last Time Buy indicates the manufacturer (Vishay) has discontinued production and will not accept new orders beyond a specified cutoff date. Existing inventory is limited. Substitution to an Active-status part such as CNY17-3X or CNY17-5X is necessary for long-term design continuity and future production runs.

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