PC3Q67 Equivalent & Substitute Parts

Part Overview

The PC3Q67 is a 4-channel optoisolator with transistor output manufactured by Sharp Microelectronics. It provides 2500Vrms isolation voltage and is designed for applications requiring galvanic isolation between input and output circuits. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

PC3Q67

Sharp MicroelectronicsIn Stock: 1571PC3Q67 Datasheet

Current PartRFQ

TCMT4100

Vishay Semiconductor Opto DivisionIn Stock: 9834TCMT4100 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PC3Q67 optoisolator is determined by the following critical parameters:

• Channel Configuration: 4-channel transistor output optoisolator
• Isolation Voltage: Minimum 2500Vrms required for functional equivalence
• Output Specifications: Maximum output voltage and current per channel (35V, 50mA)
• Package Compatibility: 16-SOIC form factor for PCB layout compatibility
• Operating Temperature Range: Support for -30°C to 100°C minimum
• Input/Output Type: DC input with transistor output topology

The TCMT4100 from Vishay Semiconductor Opto Division meets these substitution criteria with enhanced specifications across isolation voltage, output voltage rating, and temperature range.

Parameter Comparison

Engineering Selection Recommendations

The TCMT4100 optoisolator serves as a direct substitute for the obsolete PC3Q67. Key selection factors include:

Product Status: The PC3Q67 is obsolete, while the TCMT4100 maintains active production status, ensuring long-term availability and supply chain continuity.

Compliance: The TCMT4100 is ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The PC3Q67 is RoHS non-compliant, which may restrict use in regulated applications.

Electrical Performance: The TCMT4100 provides superior isolation voltage (3750Vrms vs. 2500Vrms) and higher maximum output voltage (70V vs. 35V), offering enhanced design margins. Output current per channel remains equivalent at 50mA.

Package Compatibility: Both components use identical 16-SOIC packaging, enabling direct PCB layout compatibility without redesign.

Temperature Range: The TCMT4100 extends the lower operating temperature limit to -40°C, providing broader environmental coverage compared to the PC3Q67 at -30°C.

Frequently Asked Questions (FAQ)

Q: Can the TCMT4100 directly replace the PC3Q67 on existing PCBs?

A: Yes. Both components use the 16-SOIC package with identical pinout and electrical interface. No PCB modifications are required for physical substitution.

Q: What are the key differences between these optoisolators?

A: The TCMT4100 provides higher isolation voltage (3750Vrms vs. 2500Vrms), higher maximum output voltage (70V vs. 35V), extended lower temperature operation (-40°C vs. -30°C), and ROHS3 compliance. Output current per channel and rise/fall times are comparable.

Q: Is the TCMT4100 suitable for applications originally designed for the PC3Q67?

A: Yes. The TCMT4100 meets or exceeds all critical parameters of the PC3Q67, including channel count, output type, and package form factor. The enhanced specifications provide additional design margin.

Q: What is the significance of the higher isolation voltage in the TCMT4100?

A: The 3750Vrms isolation rating of the TCMT4100 exceeds the 2500Vrms requirement of the PC3Q67, providing greater safety margin and compatibility with applications requiring higher isolation levels.

Q: Does the TCMT4100 require different circuit design considerations?

A: No design changes are necessary. The TCMT4100 maintains functional compatibility with PC3Q67 circuit designs. The higher output voltage rating (70V vs. 35V) and improved saturation characteristics (300mV vs. 200mV) represent performance enhancements rather than incompatibilities.

Q: Why is RoHS compliance important for this substitution?

A: ROHS3 compliance of the TCMT4100 ensures compatibility with modern manufacturing standards and regulatory requirements in many markets. The PC3Q67's non-compliance may restrict its use in new designs or regulated applications.