TCDT1123 Equivalent & Substitute Parts

Part Overview

The TCDT1123 is an optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. It provides 5000Vrms isolation with a single channel in a 6-DIP package, designed for DC input applications requiring galvanic isolation. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and new designs requiring equivalent functionality.

Substiute Parts

TCDT1123

Vishay Semiconductor Opto DivisionIn Stock: 8767TCDT1123 Datasheet

Current PartRFQ

CNY17-3-060E

Broadcom LimitedIn Stock: 881CNY17-3-060E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TCDT1123 is determined by the following critical parameters:

• Isolation voltage rating of 5000Vrms
• Single channel configuration
• Current transfer ratio range of 100-200% @ 10mA
• Transistor output topology
• Maximum output voltage of 70V
• Operating temperature range of -55°C to 100°C
• 6-DIP through-hole package format
• ROHS3 compliance and REACH unaffected status

The CNY17-3-060E from Broadcom Limited meets all these substitution criteria while maintaining electrical and mechanical compatibility with the TCDT1123.

Parameter Comparison

Engineering Selection Recommendations

The CNY17-3-060E is the direct substitute for the obsolete TCDT1123. Both components maintain identical isolation voltage, current transfer ratio specifications, output voltage limits, and operating temperature ranges. The CNY17-3-060E is manufactured by Broadcom Limited with active product status, ensuring continued availability and supply chain stability.

The CNY17-3-060E features a transistor with base output configuration compared to the standard transistor output of the TCDT1123, providing additional design flexibility. The output current capability of the CNY17-3-060E (150mA per channel) exceeds the TCDT1123 specification (50mA per channel), making it suitable for applications requiring higher output drive capability without compromising compatibility.

Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The identical 6-DIP package and through-hole mounting type ensure direct mechanical and electrical compatibility in existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the CNY17-3-060E directly replace the TCDT1123 in existing designs?

A: Yes. The CNY17-3-060E maintains identical isolation voltage (5000Vrms), current transfer ratio (100-200% @ 10mA), output voltage limits (70V max), operating temperature range (-55°C to 100°C), and 6-DIP package format. The identical pinout and through-hole mounting enable direct substitution without PCB modifications.

Q: What is the difference between transistor and transistor with base output?

A: The CNY17-3-060E includes a base connection on the output transistor, providing additional design flexibility for applications requiring base current control. The TCDT1123 standard transistor output does not expose the base connection. Both configurations are electrically compatible for applications not requiring explicit base control.

Q: Does the higher output current rating of the CNY17-3-060E affect compatibility?

A: No. The CNY17-3-060E output current rating of 150mA per channel exceeds the TCDT1123 specification of 50mA per channel. This represents an enhancement that maintains full backward compatibility. Applications designed for 50mA operation will function identically with the CNY17-3-060E.

Q: Are there any compliance or regulatory differences between these components?

A: No. Both the TCDT1123 and CNY17-3-060E are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements for current applications.

Q: What is the significance of the active product status of the CNY17-3-060E?

A: The CNY17-3-060E maintains active product status with Broadcom Limited, ensuring continued manufacturing, availability, and technical support. This contrasts with the TCDT1123 obsolete status, making the CNY17-3-060E the recommended choice for new designs and ongoing system support.