6N136 Optoisolator Equivalent & Substitute Parts

Part Overview

The 6N136 is a high-speed optoisolator transistor with base output, designed for galvanic isolation applications requiring 5000Vrms isolation voltage. This 8-pin DIP component integrates an LED input stage with a phototransistor output stage, providing 1 Mbits data transmission capability. The part is manufactured by QT Brightek (QTB) and is currently in active production status with 50,100 units in stock. Equivalent and substitute parts are necessary when addressing supply chain constraints, inventory availability, or specific application requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

6N136

QT Brightek (QTB)In Stock: 501726N136 Datasheet

Current PartRFQ

QT4502

QT Brightek (QTB)In Stock: 999QT4502 Datasheet

Parametric EquivalentRFQ

QT4503

QT Brightek (QTB)In Stock: 962QT4503 Datasheet

Parametric EquivalentRFQ

6N136

onsemiIn Stock: 501706N136 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 6N136 is determined by strict parametric equivalence across the following critical specifications:

Primary Substitution Criteria:

• Isolation voltage rating of 5000Vrms
• Single-channel configuration
• Current transfer ratio range: 19% to 50% @ 16mA
• Transistor output with base connection
• Maximum output voltage of 20V
• Output current capacity of 8mA per channel
• 8-DIP through-hole package (0.300", 7.62mm)
• Operating temperature range: -55°C to 100°C
• Input type: DC

Compliance Requirements:

• ROHS3 compliance
• Moisture Sensitivity Level 1
• REACH unaffected status

Parts meeting all these parameters are classified as parametric equivalents and direct substitutes. Parts with differing isolation voltage ratings or switching speed characteristics are not interchangeable for applications requiring the specified 5000Vrms isolation performance.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Full Parametric Equivalence):

QT4502 and QT4503 manufactured by QT Brightek are parametric equivalents to the 6N136 (QTB). Both parts maintain identical electrical specifications including 5000Vrms isolation voltage, 350ns switching times, and all output characteristics. Both are ROHS3 compliant and carry MSL 1 rating. These parts are suitable for direct substitution in applications where the 6N136 (QTB) is specified, with no circuit modifications required.

Limited Substitution (Parametric Deviation):

The 6N136 manufactured by onsemi differs in two critical parameters: isolation voltage is rated at 2500Vrms (50% reduction from 5000Vrms specification) and switching times are slower at 450ns turn-on and 500ns turn-off (versus 350ns for the QTB version). The onsemi 6N136 is also listed as obsolete product status. This part is not suitable for applications requiring 5000Vrms isolation performance and should not be used as a substitute for the QTB 6N136 in new designs or where isolation voltage specifications are critical.

Compliance Considerations:

All QT Brightek parts (6N136, QT4502, QT4503) maintain active product status and ROHS3 compliance, ensuring regulatory alignment for current manufacturing environments. The onsemi 6N136 obsolete status presents long-term supply risk and should be avoided for new applications.

Frequently Asked Questions (FAQ)

Q: Can QT4502 or QT4503 be used as direct replacements for 6N136 in existing designs?

A: Yes. QT4502 and QT4503 are parametric equivalents with identical electrical and mechanical specifications to the 6N136 (QTB). No circuit modifications or PCB layout changes are required. Both parts use the same 8-DIP package footprint and pin configuration.

Q: What is the key difference between the QTB 6N136 and the onsemi 6N136?

A: The onsemi 6N136 has a 2500Vrms isolation rating compared to 5000Vrms for the QTB version. Additionally, onsemi switching times are 450ns/500ns versus 350ns/350ns for QTB. The onsemi part is obsolete. These differences make it unsuitable for applications requiring 5000Vrms isolation.

Q: Are all substitute parts ROHS3 compliant?

A: QT4502 and QT4503 are ROHS3 compliant. The onsemi 6N136 compliance status is not specified in available documentation.

Q: What is the inventory availability for substitute parts?

A: QT4502 has 981 units in stock and QT4503 has 941 units in stock. The primary 6N136 (QTB) has 50,100 units available. Inventory levels should be verified with the supplier for current availability.

Q: Can the 6N136 be used in high-voltage isolation applications?

A: The 6N136 (QTB) with 5000Vrms isolation is suitable for applications requiring galvanic isolation up to 5000Vrms. The onsemi version with 2500Vrms rating is not suitable for applications exceeding 2500Vrms isolation requirements.

Q: Are there any thermal or environmental differences between substitute parts?

A: All parts share identical operating temperature range (-55°C to 100°C) and Moisture Sensitivity Level 1 (unlimited). No thermal or environmental performance differences exist between QTB 6N136, QT4502, and QT4503.

Q: What is the significance of the 350ns switching time specification?

A: The 350ns turn-on and turn-off times define the maximum data transmission speed capability of 1 Mbits. The onsemi version with 450ns/500ns switching times has slower response characteristics and is not interchangeable for high-speed applications.