6N136SD Optoisolator Equivalent & Substitute Parts

Part Overview

The 6N136SD is an optoisolator transistor with base output manufactured by onsemi, rated for 2500Vrms isolation voltage in an 8-SMD surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 6N136SD provides galvanic isolation for low-speed signal transmission in industrial control, power management, and safety-critical applications requiring single-channel isolation.

Key Parameters

Parameter	Value
Isolation Voltage	2500Vrms
Number of Channels	1
Output Type	Transistor with Base
Current Transfer Ratio (Min)	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA
Turn On / Turn Off Time	450ns / 500ns
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Operating Temperature	-55°C ~ 100°C
Package / Case	8-SMD, Gull Wing
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the 6N136SD is determined by the following critical parameters:

Isolation Voltage: Minimum 2500Vrms required; higher ratings (3750Vrms, 5000Vrms) are acceptable as they provide enhanced isolation margin
Output Type: Must be Transistor with Base to maintain circuit compatibility
Number of Channels: Single channel only
Current Transfer Ratio: Minimum 19% @ 16mA; maximum 50% @ 16mA defines acceptable gain range
Output Voltage & Current: Maximum 20V output, 8mA per channel
Package / Case: 8-SMD, Gull Wing form factor for PCB compatibility
Mounting Type: Surface mount only
Input Type: DC input required

Substitute parts are grouped into three categories based on isolation voltage rating and manufacturer:

Category A - Direct Upgrade (5000Vrms): Enhanced isolation voltage with identical electrical performance Category B - Equivalent Isolation (3750Vrms): Mid-range isolation suitable for most applications Category C - Alternative Topology: Different output configuration or manufacturer with comparable isolation

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ 16mA	CTR Max @ 16mA	Turn On / Turn Off Time	Output Type	Operating Temp	Product Status	RoHS Status
6N136SD	onsemi	2500Vrms	19%	50%	450ns / 500ns	Transistor with Base	-55°C ~ 100°C	Obsolete	Not specified
6N136SDM	onsemi	5000Vrms	19%	50%	250ns / 260ns	Transistor with Base	-40°C ~ 100°C	Active	ROHS3 Compliant
6N135S-TA1	Lite-On Inc.	5000Vrms	7%	50%	90ns / 800ns	Transistor with Base	-40°C ~ 85°C	Active	ROHS3 Compliant
6N136#300	Broadcom Limited	3750Vrms	19%	50%	200ns / 600ns	Transistor with Base	-55°C ~ 100°C	Active	RoHS non-compliant
6N136-300E	Broadcom Limited	3750Vrms	19%	50%	200ns / 600ns	Transistor with Base	-55°C ~ 100°C	Active	ROHS3 Compliant
6N136-320E	Broadcom Limited	5000Vrms	19%	50%	200ns / 600ns	Transistor with Base	-55°C ~ 100°C	Active	ROHS3 Compliant
6N136-500E	Broadcom Limited	3750Vrms	19%	50%	200ns / 600ns	Transistor with Base	-55°C ~ 100°C	Active	ROHS3 Compliant
6N136-520E	Broadcom Limited	5000Vrms	19%	50%	200ns / 600ns	Transistor with Base	-55°C ~ 100°C	Active	ROHS3 Compliant
6N136-560E	Broadcom Limited	3750Vrms	19%	50%	200ns / 600ns	Transistor with Base	-55°C ~ 100°C	Active	ROHS3 Compliant
HCPL-4504#300	Broadcom Limited	3750Vrms	25%	60%	200ns / 300ns	Transistor	-55°C ~ 100°C	Active	RoHS non-compliant
HCPL-4562-300E	Broadcom Limited	3750Vrms	Not specified	Not specified	Not specified	Transistor with Base	-40°C ~ 85°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 6N136SDM (onsemi)

The 6N136SDM is the direct successor from the original manufacturer. It maintains identical electrical specifications (19% to 50% CTR range, 8mA output current, 20V maximum output voltage) while providing doubled isolation voltage (5000Vrms vs. 2500Vrms). The part is active, ROHS3 compliant, and available in Tape & Reel packaging. Faster switching times (250ns/260ns vs. 450ns/500ns) offer improved performance margin. Operating temperature range is -40°C to 100°C, which covers most industrial applications.

Secondary Recommendation: 6N136-320E or 6N136-520E (Broadcom Limited)

Both parts provide 5000Vrms isolation with identical CTR specifications (19% to 50%). The 6N136-320E is available in Tube packaging, while 6N136-520E is supplied in Tape & Reel. Both are ROHS3 compliant and active. Switching times are 200ns/600ns. Operating temperature range is -55°C to 100°C, matching the original 6N136SD. These parts are suitable for designs requiring extended low-temperature operation.

Tertiary Recommendation: 6N136-300E or 6N136-500E (Broadcom Limited)

These parts provide 3750Vrms isolation, which exceeds the original 2500Vrms requirement. Both maintain 19% to 50% CTR range and 8mA output current. The 6N136-300E is supplied in Tube packaging with 8-DIP Gull Wing supplier package. The 6N136-500E is available in Cut Tape & Digi-Reel with 8-SO supplier package. Both are ROHS3 compliant and active. Operating temperature range is -55°C to 100°C. These options are suitable for cost-optimized designs where 3750Vrms isolation margin is acceptable.

Alternative: 6N135S-TA1 (Lite-On Inc.)

This part provides 5000Vrms isolation from an alternative manufacturer. CTR range is 7% to 50%, with minimum CTR below the original specification. Switching times are significantly faster (90ns/800ns). Operating temperature range is -40°C to 85°C, which is narrower than the original. This part is ROHS3 compliant and active. Selection requires verification that the lower minimum CTR (7% vs. 19%) is acceptable for the application.

Not Recommended: HCPL-4504#300

This part has different output topology (Transistor without Base vs. Transistor with Base), making it incompatible with circuits designed for base-driven output. Although it provides 3750Vrms isolation and higher CTR (25% to 60%), the output configuration change requires circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher isolation voltage than the original 6N136SD?

A: Yes. Higher isolation voltage ratings (3750Vrms or 5000Vrms) are acceptable substitutes for the 2500Vrms original. They provide additional isolation margin and are electrically compatible. No circuit modification is required.

Q: What is the difference between 6N136-300E and 6N136-500E?

A: Both parts have identical electrical specifications (3750Vrms isolation, 19% to 50% CTR). The difference is in packaging and supplier device package. The 6N136-300E is supplied in Tube with 8-DIP Gull Wing package, while 6N136-500E is supplied in Cut Tape & Digi-Reel with 8-SO package. Select based on your procurement and assembly requirements.

Q: Why is the 6N136SDM faster than the original 6N136SD?

A: The 6N136SDM has turn-on/turn-off times of 250ns/260ns compared to the original 450ns/500ns. This is a design improvement in the active successor part. Faster switching does not affect compatibility; it only improves performance margin.

Q: Is ROHS3 compliance required for my application?

A: ROHS3 compliance is mandatory for products sold in the European Union and many other regions. If your application requires ROHS3 compliance, select only parts marked as ROHS3 Compliant. Parts marked as RoHS non-compliant (such as 6N136#300 and HCPL-4504#300) may not be suitable for regulated markets.

Q: Can I substitute the 6N135S-TA1 for the 6N136SD?

A: The 6N135S-TA1 is electrically compatible with minimum CTR of 7%, which is below the original 19% minimum. Substitution is possible only if your circuit design can tolerate the lower minimum current transfer ratio. Verify that the application does not depend on the higher minimum CTR specification.

Q: What is the difference between Tube, Tape & Reel, and Cut Tape packaging?

A: Packaging affects procurement and assembly logistics, not electrical performance. Tube packaging is for manual handling and small quantities. Tape & Reel is for automated pick-and-place assembly in high volumes. Cut Tape & Digi-Reel is for medium-volume production. Select based on your manufacturing process and order quantity.

Q: Why does HCPL-4504#300 have a different output type?

A: The HCPL-4504#300 has Transistor output (without Base) instead of Transistor with Base. This is a different circuit topology that requires base drive circuitry to be redesigned. It is not a direct substitute without circuit modification.

Q: What is the operating temperature range difference between parts?

A: The original 6N136SD operates from -55°C to 100°C. Some substitutes (6N136SDM, 6N135S-TA1, HCPL-4562-300E) have narrower ranges starting at -40°C. If your application requires operation below -40°C, select parts with -55°C minimum rating (6N136-300E, 6N136-320E, 6N136-500E, 6N136-520E, 6N136-560E, HCPL-4504#300).

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