LMS4684LD Equivalent & Substitute Parts

Part Overview

The LMS4684LD is a 2-circuit SPDT (Single Pole Double Throw) analog switch IC manufactured by Texas Instruments, designed for signal routing and multiplexing applications. This component features 800mOhm on-state resistance and operates across a 1.8V to 5.5V supply voltage range in a compact 10-WSON (3x4) surface mount package.

The LMS4684LD carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for systems utilizing this interface component.

Key Parameters

Parameter	Value
Switch Circuit Type	SPDT
Multiplexer/Demultiplexer Configuration	2:1
Number of Circuits	2
On-State Resistance (Max)	800mOhm
Channel-to-Channel Matching (ΔRon)	1.11mOhm
Supply Voltage Range (Single)	1.8V ~ 5.5V
Switch Time (Ton/Toff Max)	60ns / 40ns
Charge Injection	200pC
Leakage Current (IS(off) Max)	1nA
Crosstalk	-72dB @ 100kHz
Operating Temperature Range	-40°C ~ 85°C
Package Type	10-WFDFN Exposed Pad
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the LMS4684LD is determined by strict equivalence across the following critical parameters:

Switch circuit topology (SPDT configuration)
Multiplexer/demultiplexer ratio (2:1)
Number of independent circuits (2)
On-state resistance specification (800mOhm maximum)
Channel-to-channel matching tolerance (1.11mOhm)
Supply voltage operating range (1.8V ~ 5.5V)
Switch timing characteristics (60ns Ton, 40ns Toff maximum)
Charge injection (200pC)
Leakage current specification (1nA maximum)
Crosstalk performance (-72dB @ 100kHz)
Operating temperature range (-40°C ~ 85°C)
Physical package form factor (10-WFDFN Exposed Pad)

Only parts meeting all these electrical and mechanical specifications qualify as direct substitutes. Packaging format variations (bulk versus tape & reel) do not affect functional equivalence.

Parameter Comparison

Parameter	LMS4684LD	LMS4684LD/NOPB
Manufacturer	Texas Instruments	Texas Instruments
Switch Circuit	SPDT	SPDT
Multiplexer/Demultiplexer Circuit	2:1	2:1
Number of Circuits	2	2
On-State Resistance (Max)	800mOhm	800mOhm
Channel-to-Channel Matching (ΔRon)	1.11mOhm	1.11mOhm
Supply Voltage Range	1.8V ~ 5.5V	1.8V ~ 5.5V
Switch Time Ton (Max)	60ns	60ns
Switch Time Toff (Max)	40ns	40ns
Charge Injection	200pC	200pC
Leakage Current (Max)	1nA	1nA
Crosstalk	-72dB @ 100kHz	-72dB @ 100kHz
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	10-WFDFN Exposed Pad	10-WFDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	3 (168 Hours)
Packaging Format	Bulk	Tape & Reel (TR)

Engineering Selection Recommendations

The LMS4684LD/NOPB is a direct functional equivalent to the LMS4684LD. Both parts are manufactured by Texas Instruments and share identical electrical specifications across all critical parameters including switch topology, on-state resistance, timing characteristics, and operating ranges.

The primary distinction between these parts is product lifecycle status and regulatory compliance. The LMS4684LD carries Obsolete status, while the LMS4684LD/NOPB is Active. The LMS4684LD/NOPB meets ROHS3 compliance requirements, whereas the original LMS4684LD is RoHS non-compliant. For new designs or production requiring regulatory compliance, the LMS4684LD/NOPB is the appropriate selection.

Moisture sensitivity differs between the two variants: the LMS4684LD specifies MSL 1 (Unlimited), while the LMS4684LD/NOPB specifies MSL 3 (168 Hours). This affects storage and handling protocols but does not impact functional performance in deployed applications.

Both parts are supplied in the same 10-WFDFN Exposed Pad package. The LMS4684LD/NOPB is available in Tape & Reel packaging format, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the LMS4684LD/NOPB be used as a direct replacement for the LMS4684LD?

A: Yes. The LMS4684LD/NOPB is electrically and mechanically equivalent to the LMS4684LD. All functional parameters, including switch topology, on-state resistance, timing, and operating ranges, are identical. The primary difference is product status and compliance certifications.

Q: What is the significance of the Obsolete status on the LMS4684LD?

A: Obsolete status indicates that Texas Instruments has discontinued active production and support for this part number. The LMS4684LD/NOPB, which is Active, is the recommended alternative for ongoing supply and support.

Q: Are there package compatibility differences between these parts?

A: Both parts use the 10-WFDFN Exposed Pad package form factor and are surface mount components. The packaging format differs (bulk versus Tape & Reel), but this does not affect PCB footprint or electrical performance.

Q: What does the "/NOPB" designation mean?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) and is associated with RoHS compliance. This designation reflects the part's compliance with lead-free manufacturing standards.

Q: Does the difference in Moisture Sensitivity Level affect circuit performance?

A: Moisture Sensitivity Level (MSL) affects component storage and handling requirements, not circuit performance. MSL 1 allows unlimited shelf life, while MSL 3 requires storage in controlled humidity conditions for up to 168 hours. Once soldered into a circuit, both parts perform identically.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both the LMS4684LD and LMS4684LD/NOPB operate across the identical temperature range of -40°C to 85°C.

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