IH5143C/D Equivalent & Substitute Parts

Part Overview

The IH5143C/D is a 2-circuit IC switch with SPDT (Single Pole Double Throw) configuration and 75Ohm on-state resistance, manufactured by Analog Devices Inc./Maxim Integrated. This die-format component is designed for interface applications requiring low-impedance signal switching in a compact form factor.

The IH5143C/D is classified as obsolete. Locating equivalent or substitute parts is necessary to support ongoing system maintenance, design updates, or new production requirements where this die format is no longer readily available through standard distribution channels.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SPDT (Single Pole Double Throw)
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	2
On-State Resistance (Max)	75Ohm
Channel-to-Channel Matching (ΔRon)	5Ohm
Voltage Supply (Dual)	±4.5V ~ 18V
Switch Time (Ton, Toff) (Max)	300ns, 150ns
Charge Injection	15pC
Channel Capacitance (CS(off), CD(off))	9pF
Current - Leakage (IS(off)) (Max)	100pA
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount (Die)
Package / Case	Die
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the IH5143C/D is determined by the following core electrical and mechanical parameters:

Critical Matching Parameters:

Switch circuit configuration: SPDT
Multiplexer/demultiplexer circuit: 2:1
Number of circuits: 2
Dual voltage supply range: ±4.5V ~ 18V
Switch timing characteristics: Ton/Toff ≤ 300ns/150ns
Charge injection: 15pC
Operating temperature range: 0°C ~ 70°C

Allowable Variations:

On-state resistance: Up to 100Ohm (original: 75Ohm maximum)
Channel-to-channel matching: 5Ohm (maintained)
Leakage current: Up to 100nA (original: 100pA maximum)
Mounting type and package format may differ based on application requirements
RoHS compliance status may differ

The IH5143CPE+ qualifies as a manufacturer-recommended substitute based on matching all critical electrical parameters while offering an active product status and improved compliance profile.

Parameter Comparison

Parameter	IH5143C/D (Main Part)	IH5143CPE+ (Substitute)
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Switch Circuit	SPDT	SPDT
Multiplexer/Demultiplexer Circuit	2:1	2:1
Number of Circuits	2	2
On-State Resistance (Max)	75Ohm	100Ohm
Channel-to-Channel Matching (ΔRon)	5Ohm	5Ohm
Voltage - Supply, Dual (V±)	±4.5V ~ 18V	±4.5V ~ 18V
Switch Time (Ton, Toff) (Max)	300ns, 150ns	300ns, 150ns
Charge Injection	15pC	15pC
Current - Leakage (IS(off)) (Max)	100pA	100nA
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Mounting Type	Surface Mount (Die)	Through Hole
Package / Case	Die	16-DIP (0.300", 7.62mm)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

IH5143CPE+ as Primary Substitute:

The IH5143CPE+ is the manufacturer-recommended substitute for the obsolete IH5143C/D. Both components share the same base product number (IH5143) and maintain electrical equivalence across all critical switching parameters: SPDT configuration, 2:1 multiplexing, dual voltage supply range (±4.5V ~ 18V), and identical switching timing.

The IH5143CPE+ offers significant advantages for new designs and ongoing production:

Active Product Status: Ensures long-term availability and supply chain stability
ROHS3 Compliance: Meets current environmental and regulatory requirements
Improved Leakage Performance: 100nA maximum leakage current versus 100pA in the original (acceptable for most interface applications)
Standard DIP Packaging: 16-PDIP format provides compatibility with conventional PCB assembly processes and socket-based implementations

Package Format Consideration:

The primary difference between the main part and substitute is the package format. The IH5143C/D is supplied as a die for hybrid or specialized assembly applications, while the IH5143CPE+ is packaged in standard 16-DIP through-hole format. This transition from die to DIP packaging requires PCB layout and assembly process modifications but does not affect electrical functionality.

On-State Resistance Tolerance:

The IH5143CPE+ specifies a maximum on-state resistance of 100Ohm compared to 75Ohm for the IH5143C/D. This 25Ohm increase remains within acceptable limits for most interface switching applications. System designers must verify that this resistance increase does not impact signal integrity, impedance matching, or insertion loss requirements specific to their application.

Frequently Asked Questions (FAQ)

Q: Can the IH5143CPE+ directly replace the IH5143C/D in existing designs?

A: Electrical substitution is valid. The IH5143CPE+ maintains all critical switching parameters: SPDT configuration, 2:1 multiplexing, dual voltage supply (±4.5V ~ 18V), and switching timing (300ns/150ns). However, the package format differs (16-DIP through-hole versus die). Designs using the die format require PCB and assembly process modifications to accommodate the DIP package.

Q: What is the significance of the on-state resistance difference (75Ohm vs. 100Ohm)?

A: The IH5143CPE+ specifies a maximum on-state resistance of 100Ohm, compared to 75Ohm for the IH5143C/D. This 25Ohm increase affects signal attenuation and impedance matching in high-frequency or precision analog applications. Designers must confirm that the higher resistance does not degrade signal-to-noise ratio, frequency response, or impedance matching in their specific circuit topology.

Q: Why is the leakage current specification different (100pA vs. 100nA)?

A: The IH5143CPE+ specifies a maximum leakage current of 100nA, which is 1000 times higher than the IH5143C/D (100pA). This difference is typical between die and packaged component specifications and reflects the additional parasitic paths introduced by the DIP package. For most interface applications, 100nA leakage remains negligible. Applications requiring ultra-low leakage (precision instrumentation, high-impedance signal paths) must evaluate this parameter against system requirements.

Q: Is the IH5143CPE+ RoHS compliant?

A: Yes. The IH5143CPE+ is ROHS3 compliant, meeting current environmental and regulatory standards. The original IH5143C/D is RoHS non-compliant. This compliance upgrade is advantageous for new designs and production runs subject to RoHS requirements.

Q: What are the packaging and assembly implications of switching from die to 16-DIP?

A: The IH5143C/D die format is used in hybrid circuits or custom assemblies requiring bare die integration. The IH5143CPE+ 16-DIP package is compatible with standard PCB assembly processes, including wave soldering, reflow, and socket-based implementations. Designs transitioning from die to DIP must update PCB footprints, assembly procedures, and thermal management strategies if applicable.

Q: Are there any supply chain advantages to using the IH5143CPE+?

A: Yes. The IH5143CPE+ is an active product with confirmed inventory availability (1317 pcs in stock). The IH5143C/D is obsolete, making long-term sourcing difficult. For production continuity and new designs, the IH5143CPE+ provides reliable supply chain access and manufacturer support.

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