FOD250LS Optoisolator Equivalent & Substitute Parts

Part Overview

The FOD250LS is an optoisolator transistor with base output manufactured by onsemi, rated for 5000Vrms isolation voltage in a single-channel 8-SMD surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The FOD250LS provides DC input with transistor output featuring base access, suitable for high-voltage isolation applications requiring 5kV isolation performance.

Key Parameters

Parameter	FOD250LS Value
Isolation Voltage	5000Vrms
Number of Channels	1
Output Type	Transistor with Base
Current Transfer Ratio (Min)	15% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA
Voltage - Output (Max)	7V
Current - Output / Channel	8mA
Voltage - Forward (Vf) (Typ)	1.45V
Current - DC Forward (If) (Max)	25mA
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SMD, Gull Wing
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the FOD250LS is determined by the following critical parameters:

Primary Substitution Criteria:

Isolation voltage rating (5000Vrms minimum for direct replacement)
Output type (transistor with base configuration)
Number of channels (single channel)
Package type (8-SMD, Gull Wing surface mount)
Current transfer ratio range compatibility (15-50% @ 16mA)
Input type (DC)
Output current capability (8mA minimum)

Secondary Compatibility Factors:

Operating temperature range (must encompass or exceed -40°C to 85°C)
Forward voltage characteristics (Vf approximately 1.45V)
Maximum forward current (25mA)
Moisture sensitivity level (MSL 1 or equivalent)

Substitutes are grouped into two categories: Direct 5000Vrms Replacements (maintaining identical isolation voltage) and Functional Alternatives (3750Vrms isolation with enhanced performance characteristics). The 3750Vrms alternatives are suitable where application isolation requirements permit lower voltage ratings but require improved switching speed or extended temperature range.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ 16mA	CTR Max @ 16mA	Vout Max	Iout / Channel	Vf (Typ)	If Max	Temp Range	Package	Status
FOD250LS	onsemi	5000Vrms	15%	50%	7V	8mA	1.45V	25mA	-40°C ~ 85°C	8-SMD, Gull Wing	Obsolete
6N135SMT&R	Isocom Components 2004 LTD	5000Vrms	7%	50%	20V	8mA	1.45V	25mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active
6N136-320E	Broadcom Limited	5000Vrms	19%	50%	20V	8mA	1.5V	25mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active
6N136-520E	Broadcom Limited	5000Vrms	19%	50%	20V	8mA	1.5V	25mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active
6N136-X017T	Vishay Semiconductor Opto Division	5300Vrms	19%	Not Specified	15V	8mA	1.33V	25mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active
6N135-300E	Broadcom Limited	3750Vrms	7%	50%	20V	8mA	1.5V	25mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active
6N135-500E	Broadcom Limited	3750Vrms	7%	50%	20V	8mA	1.5V	25mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active
6N136#300	Broadcom Limited	3750Vrms	19%	50%	20V	8mA	1.5V	25mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active
6N136-300E	Broadcom Limited	3750Vrms	19%	50%	20V	8mA	1.5V	25mA	-55°C ~ 100°C	8-DIP Gull Wing	Active
6N136-500E	Broadcom Limited	3750Vrms	19%	50%	20V	8mA	1.5V	25mA	-55°C ~ 100°C	8-SO	Active
6N136-560E	Broadcom Limited	3750Vrms	19%	50%	20V	8mA	1.5V	25mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active

Engineering Selection Recommendations

Direct Replacement (5000Vrms Isolation):

For applications requiring exact isolation voltage matching, the following active parts provide direct substitution:

6N136-320E (Broadcom Limited, Tube packaging): Meets 5000Vrms isolation requirement with improved current transfer ratio (19% minimum) and extended temperature range (-55°C to 100°C). RoHS3 compliant. Recommended for new designs requiring maximum compatibility.
6N136-520E (Broadcom Limited, Tape & Reel packaging): Identical electrical specifications to 6N136-320E with tape and reel packaging for automated assembly. RoHS3 compliant. Suitable for high-volume production.
6N135SMT&R (Isocom Components 2004 LTD, Tape & Reel packaging): Maintains 5000Vrms isolation with extended operating temperature (-55°C to 100°C). RoHS3 compliant. Provides alternative sourcing option.
6N136-X017T (Vishay Semiconductor Opto Division, Tape & Reel packaging): Exceeds isolation voltage requirement at 5300Vrms with improved switching characteristics (200ns turn-on/off). RoHS3 compliant. Suitable for applications requiring enhanced performance margins.

Functional Alternative (3750Vrms Isolation):

For applications where 3750Vrms isolation voltage is acceptable, the following active parts offer enhanced performance characteristics:

6N136-300E (Broadcom Limited): Improved current transfer ratio (19% minimum), faster switching (200ns/600ns), extended temperature range. Available in tube packaging. RoHS3 compliant. Highest inventory availability (7510 pcs).
6N136-560E (Broadcom Limited): Identical specifications to 6N136-300E with standard packaging. RoHS3 compliant. Suitable for standard procurement channels.
6N135-300E (Broadcom Limited): Lower current transfer ratio minimum (7%) with RoHS3 compliance. Tube packaging. Suitable where lower CTR is acceptable.

Compliance Status:

All recommended active substitutes maintain RoHS3 compliance and REACH unaffected status. The FOD250LS obsolete status necessitates transition to active alternatives. All substitutes feature MSL 1 (unlimited moisture sensitivity level) matching the original part.

Frequently Asked Questions (FAQ)

Q: Can I use a 3750Vrms part to replace the 5000Vrms FOD250LS?

A: Substitution with 3750Vrms parts (6N135 or 6N136 series) is permissible only if your application isolation voltage requirement is 3750Vrms or lower. The lower isolation rating does not provide equivalent safety margins for 5000Vrms applications. Verify circuit isolation requirements before substitution.

Q: What is the difference between 6N136-320E and 6N136-520E?

A: Both parts are electrically identical with 5000Vrms isolation and identical performance specifications. The primary difference is packaging: 6N136-320E is supplied in tube packaging, while 6N136-520E is supplied in tape and reel format. Selection depends on assembly process requirements.

Q: Why does 6N135SMT&R have lower minimum CTR (7%) than 6N136-320E (19%)?

A: Current transfer ratio specifications vary by manufacturer and product line. Both parts meet the maximum 50% CTR specification. Verify your circuit design accommodates the minimum CTR value of your selected substitute to ensure proper operation across the specified current transfer ratio range.

Q: Is the FOD250LS pin-compatible with all listed substitutes?

A: All substitutes maintain 8-pin SMD gull wing package configuration with identical pinout. However, verify specific package designations (8-SMD, 8-DIP Gull Wing, 8-SO) match your PCB footprint design. Package variants may have different physical dimensions despite identical electrical pinouts.

Q: Which substitute offers the best temperature performance?

A: All active substitutes operate across -55°C to 100°C, exceeding the FOD250LS range of -40°C to 85°C. The 6N136-X017T additionally provides the fastest switching characteristics (200ns turn-on and turn-off) for applications requiring enhanced speed performance.

Q: Are all substitutes RoHS compliant?

A: All recommended active substitutes are RoHS3 compliant. The 6N136#300 is RoHS non-compliant and should be avoided for new designs subject to RoHS requirements.

Q: What inventory considerations should I evaluate?

A: 6N136-500E offers the highest inventory availability (34,600 pcs) among active substitutes. For 5000Vrms direct replacements, 6N136-320E (805 pcs) and 6N136-520E (825 pcs) have more limited availability. Confirm supplier stock levels for production planning.

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