FSA2156P6X Equivalent & Substitute Parts

Part Overview

The FSA2156P6X is a single-circuit SPST-NO (Normally Open) IC switch manufactured by onsemi, housed in a 6-TSSOP (SC-88, SOT-363) surface mount package. This component features a typical on-state resistance of 360mOhm and operates across a supply voltage range of 1.65V to 4.3V, making it suitable for low-voltage signal switching applications. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements.

Substiute Parts

FSA2156P6X

onsemiIn Stock: 1566FSA2156P6X Datasheet

Current PartRFQ

ADG841YKSZ-500RL7

Analog Devices Inc.In Stock: 6710ADG841YKSZ-500RL7 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSA2156P6X is determined by strict equivalence across the following critical parameters:

• Switch topology: SPST-NO configuration with 1:1 multiplexer/demultiplexer ratio and single circuit count
• Package compatibility: 6-TSSOP (SC-88, SOT-363) surface mount package for direct PCB layout compatibility
• On-state resistance: Maximum 360mOhm specification to maintain signal integrity and minimize insertion loss
• Supply voltage range: Minimum 1.65V to 4.3V single supply operation
• Electrical performance: Switch timing, bandwidth, charge injection, and leakage current characteristics within acceptable operational margins
• Environmental compliance: MSL 1 rating and REACH/RoHS status for manufacturing and regulatory requirements

The ADG841YKSZ-500RL7 from Analog Devices Inc. meets these substitution criteria while offering enhanced performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The ADG841YKSZ-500RL7 is the qualified substitute for the obsolete FSA2156P6X. Both components share identical package geometry (6-TSSOP / SC-88 / SOT-363) and core switch topology (SPST-NO, 1:1 configuration), enabling direct replacement without PCB redesign.

The ADG841YKSZ-500RL7 offers active product status with full manufacturing support and extended temperature operation (-40°C to 125°C versus -40°C to 85°C). The substitute maintains on-state resistance within 10mOhm of the original specification (370mOhm versus 360mOhm typical), ensuring compatible signal insertion loss.

Supply voltage compatibility requires verification: the ADG841YKSZ-500RL7 operates at 1.65V to 3.6V, which is narrower than the FSA2156P6X range of 1.65V to 4.3V. Applications requiring operation above 3.6V require alternative component selection.

Both components carry MSL 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status, meeting standard manufacturing and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the ADG841YKSZ-500RL7 directly replace the FSA2156P6X without PCB modifications?

A: Yes. Both components use identical 6-TSSOP (SC-88, SOT-363) surface mount packaging with matching pin configurations. Direct PCB layout compatibility is maintained.

Q: What are the key differences between these two parts?

A: The primary differences are product status (obsolete versus active), supply voltage range (1.65V–4.3V versus 1.65V–3.6V), and secondary electrical characteristics. On-state resistance remains within 10mOhm, and both maintain SPST-NO topology with identical circuit count and configuration.

Q: Is the ADG841YKSZ-500RL7 suitable for applications requiring 4.3V supply operation?

A: No. The ADG841YKSZ-500RL7 maximum supply voltage is 3.6V. Applications requiring operation at 4.3V require alternative component selection or circuit redesign.

Q: Are there any compliance or certification differences?

A: Both components carry MSL 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status. The ADG841YKSZ-500RL7 is RoHS3 Compliant, providing additional regulatory alignment for new designs.

Q: What is the impact of the 10mOhm on-state resistance difference?

A: The 10mOhm difference (360mOhm versus 370mOhm) represents a 2.8% increase in insertion loss. For most low-voltage signal switching applications, this difference is negligible. High-current or precision analog applications should evaluate impact on signal integrity and power dissipation.

Q: How do the switch timing characteristics compare?

A: The ADG841YKSZ-500RL7 offers faster switching (14ns Ton / 7.8ns Toff versus 55ns / 65ns), providing improved performance for time-sensitive applications. The FSA2156P6X offers higher bandwidth (80MHz versus 21MHz) and lower charge injection (6pC versus 200pC), which may be critical for high-frequency or precision analog switching.