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Home > Products > Integrated Circuits (ICs) > Interface > Analog Switches, Multiplexers, Demultiplexers

Renesas ISL43L120IUZ-T

Name: ISL43L120IUZ-T
Brand: Renesas
SKU: ISL43L120IUZ-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ISL43L120IUZ-T

Manufacturer:: Renesas

Category:: Analog Switches, Multiplexers, Demultiplexers

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: ISL43L120IUZ-T.pdf

Description:: IC SW SPST-NOX2 250MOHM 8MSOP

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Product details

Overview

ISL43L120IUZ-T from Intersil is a dual SPST analog switch with two normally open (NO) channels, designed for precision signal routing in ultra-low-voltage, low-power portable systems. It delivers 0.16Ω ON-resistance at 3V, 13ns switching time, and operates from a single +1.65V to +3.6V supply - enabling high-fidelity audio/video switching and ASIC I/O expansion in mobile phones and medical handhelds.

For engineers reviewing the ISL43L120IUZ-T datasheet, ISL43L120IUZ-T pinout, ISL43L120IUZ-T application, or ISL43L120IUZ-T equivalent, key selection criteria include its dual NO configuration, sub-0.2Ω R_ON across 1.8–3.6V, <0.12µW quiescent power, 8kV HBM ESD rating, and compatibility with 1.8V logic on 3V supply.

Technical Context

The ISL43L120IUZ-T implements bidirectional CMOS SPST switches using submicron process technology, with integrated level shifters that translate 1.8V-compatible digital inputs (VINH ≥ 1.4V, VINL ≤ 0.5V at 3V supply) into full-rail analog gate control. Its architecture ensures matched channel performance: R_ON matching is 0.005Ω and R_ON flatness is 0.008Ω over the full signal range.

Supply sequencing is critical: V+ must be applied before any analog or digital signals to avoid forward-biasing internal ESD diodes. The device supports analog signal ranges from 0V to V+, with leakage currents limited to ±80nA across –40°C to +85°C and no bipolar supply operation.

Key Specifications

Parameter	Value and Actual Design Meaning
ON Resistance (R_ON)	0.16Ω at 3V supply - enables <0.1% insertion loss in 50Ω audio paths and minimal voltage drop at 100mA load
Switching Time (t_ON/t_OFF)	13ns/13ns at 3V - supports >10MHz digital control of analog signals without timing skew between channels
Supply Voltage Range	+1.65V to +3.6V - powers directly from single Li-ion cell (2.7–4.2V) with 10% headroom for ripple and overshoot
Quiescent Power	<0.12µW - extends battery life in always-on sensor multiplexing or standby audio routing
R_ON Matching	0.005Ω - ensures ≤0.5% gain mismatch in differential or dual-path signal conditioning
ESD Rating (HBM)	>8kV - meets IEC 61000-4-2 Level 4 for direct user-interface signal paths
Analog Signal Range	0V to V+ - preserves full dynamic range of baseband audio and sensor outputs without clamping

Pinout & Package

ISL43L120IUZ-T is housed in an 8-lead MSOP package (JEDEC MO-187AA, 3.0mm × 3.0mm footprint, 0.65mm pitch), optimized for space-constrained portable PCBs. Thermal resistance θ_JA is 190°C/W in free air.

Pin/Terminal	Circuit Role	Design Meaning
IN1, IN2	Digital Control Input	Accepts 1.8V CMOS logic; drives internal level shifter to fully turn on/off respective NO switch
COM1, COM2	Analog Switch Common	Primary signal path terminal; connects to source/load in bidirectional analog routing
NO1, NO2	Analog Switch Normally Open	Remains disconnected from COM when IN = 0; closes to COM when IN = 1 (NO configuration)
V+	Positive Supply Rail	Single supply input (1.65–3.6V); powers analog switches and digital interface; max 4.7V absolute rating
GND	Ground Reference	Return path for supply and signal; must be established before applying any input signals

Key Features

Feature	Design Value
Ultra-Low R_ON	0.16Ω at 3V ensures <0.2mV drop at 100mA - critical for millivolt-level sensor signal integrity
R_ON Flatness	0.008Ω variation over full 0–V+ signal range minimizes harmonic distortion in audio band (20Hz–20kHz)
Charge Injection	–125pC at 3V limits voltage glitch on high-impedance nodes (e.g., SAR ADC sample capacitors)
Off Isolation	62dB at 100kHz suppresses crosstalk between active and inactive channels in multi-signal routing
Pb-Free Construction	Matte tin termination and Pb-free molding compound meet RoHS and JEDEC MSL-1 reflow requirements

Applications

Mobile Phone ASIC I/O Expansion	Portable Medical Sensor Multiplexing
Use Scenario: Expanding analog input capability of baseband ASICs with limited GPIO count in smartphones. IC Role / Device Role / Timing Role: Dual NO analog switch routing external microphone, headset jack, or biometric sensor signals to shared ADC inputs. Use Value: Enables hardware reuse of existing ASIC design while adding functionality - avoids costly ASIC respin and maintains 13ns channel-to-channel timing alignment.	Use Scenario: Selecting between multiple low-level physiological sensors (ECG, SpO₂, temperature) in handheld diagnostic devices. IC Role / Device Role / Timing Role: Precision analog multiplexer with matched R_ON and low leakage, controlled by microcontroller GPIO. Use Value: Preserves µV-level signal fidelity with <80nA leakage and 0.005Ω R_ON matching - essential for accurate differential biosignal acquisition.
Low-Voltage Audio Path Switching	USB-C Alternate Mode Signal Routing
Use Scenario: Dynamic reconfiguration of stereo audio paths (speaker/headphone/line-out) in battery-powered tablets. IC Role / Device Role / Timing Role: Bidirectional SPST switch handling line-level analog signals with minimal THD+N degradation. Use Value: 0.16Ω R_ON and 0.008Ω flatness deliver <0.001% insertion loss and <–100dB crosstalk - meets Hi-Res Audio specifications.	Use Scenario: Managing analog auxiliary signals (DP AUX, USB SS) in compact USB-C receptacle designs. IC Role / Device Role / Timing Role: Low-capacitance (182pF OFF) analog switch isolating alternate mode lanes during plug detection and mode negotiation. Use Value: 182pF COFF and 62dB off isolation prevent signal corruption during hot-plug events - supports robust USB-C compliance testing.

Mobile Phone ASIC I/O Expansion

Portable Medical Sensor Multiplexing

Use Scenario: Expanding analog input capability of baseband ASICs with limited GPIO count in smartphones.

IC Role / Device Role / Timing Role: Dual NO analog switch routing external microphone, headset jack, or biometric sensor signals to shared ADC inputs.

Use Value: Enables hardware reuse of existing ASIC design while adding functionality - avoids costly ASIC respin and maintains 13ns channel-to-channel timing alignment.

Use Scenario: Selecting between multiple low-level physiological sensors (ECG, SpO₂, temperature) in handheld diagnostic devices.

IC Role / Device Role / Timing Role: Precision analog multiplexer with matched R_ON and low leakage, controlled by microcontroller GPIO.

Use Value: Preserves µV-level signal fidelity with <80nA leakage and 0.005Ω R_ON matching - essential for accurate differential biosignal acquisition.

Low-Voltage Audio Path Switching

USB-C Alternate Mode Signal Routing

Use Scenario: Dynamic reconfiguration of stereo audio paths (speaker/headphone/line-out) in battery-powered tablets.

IC Role / Device Role / Timing Role: Bidirectional SPST switch handling line-level analog signals with minimal THD+N degradation.

Use Value: 0.16Ω R_ON and 0.008Ω flatness deliver <0.001% insertion loss and <–100dB crosstalk - meets Hi-Res Audio specifications.

Use Scenario: Managing analog auxiliary signals (DP AUX, USB SS) in compact USB-C receptacle designs.

IC Role / Device Role / Timing Role: Low-capacitance (182pF OFF) analog switch isolating alternate mode lanes during plug detection and mode negotiation.

Use Value: 182pF COFF and 62dB off isolation prevent signal corruption during hot-plug events - supports robust USB-C compliance testing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual SPST analog switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TMUX1574RTER	Higher R_ON (0.5Ω at 3.3V), 1.2V logic compatible, 10-pin UQFN	Requires level-shifting for 1.8V control; larger package increases board area	Prefer when 1.2V system logic dominates and higher R_ON is acceptable
ADG821BRMZ-REEL7	Single-supply 1.8–5.5V, 0.5Ω R_ON, 8-lead MSOP but rated only to 125°C	Higher R_ON degrades SNR in audio paths; wider voltage range adds unnecessary overhead	Choose only if extended temperature range (>85°C) is mandatory and R_ON tolerance >0.3Ω

Compared with TMUX1574RTER and ADG821BRMZ-REEL7, ISL43L120IUZ-T provides the lowest R_ON and tightest matching in a space-optimized 8-lead MSOP - making it optimal for battery-powered, high-fidelity analog routing where signal integrity and board area are primary constraints.

Availability

ISL43L120IUZ-T is available at Aetrix Electronics and suitable for mobile phone design, portable medical instrumentation, low-voltage audio subsystems, and USB-C interface development requiring stable component supply and long-term production continuity.

Supply support for ISL43L120IUZ-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Intersil Corporation (now part of Renesas Electronics) is a U.S.-based analog and mixed-signal semiconductor company focused on high-performance power management, precision analog, and interface solutions.

The ISL43L120IUZ-T belongs to Intersil's ultra-low-R_ON analog switch family, engineered specifically for battery-powered portable equipment where minimal power loss, signal fidelity, and PCB space efficiency are critical design objectives.

FAQ

What is the maximum analog signal voltage range supported by the ISL43L120IUZ-T?

The ISL43L120IUZ-T supports an analog signal range from 0V to V+, where V+ is the positive supply voltage (1.65V to 3.6V). For example, with a 3.0V supply, signals from 0V to 3.0V can pass bidirectionally through the switch without clipping or distortion - confirmed in the Electrical Specifications table under "Analog Signal Range, V_ANALOG".

Does the ISL43L120IUZ-T require external level shifting when driven by 1.8V logic?

No, the ISL43L120IUZ-T is 1.8V logic compatible when operated from a 3V supply: its input high threshold (V_INH) is guaranteed ≥1.4V and input low (V_INL) ≤0.5V. This eliminates need for external level shifters in typical 1.8V MCU–3V switch interfaces - verified in the Digital Input Characteristics section of the datasheet.

Can the ISL43L120IUZ-T be used in a bipolar supply configuration?

No - the ISL43L120IUZ-T is designed exclusively for single-supply operation (V+ and GND only). Its internal level shifter and ESD protection diodes assume GND as the reference; applying negative voltages to any pin violates Absolute Maximum Ratings and may cause permanent damage, as explicitly stated in the "Power-Supply Considerations" section.

What is the thermal resistance (θ_JA) of the ISL43L120IUZ-T in its MSOP package?

The ISL43L120IUZ-T in the 8-lead MSOP package has a typical junction-to-ambient thermal resistance (θ_JA) of 190°C/W under standard JEDEC test conditions (low-thermal-conductivity board, free air). This value is specified in the "Thermal Information" table and impacts maximum allowable continuous current in thermally constrained layouts.

How does the ISL43L120IUZ-T handle overvoltage on analog pins relative to V+ or GND?

The ISL43L120IUZ-T includes ESD protection diodes from each analog pin (NO, NC, COM) to V+ and GND. If an analog signal exceeds V+ or falls below GND, one diode conducts - limiting fault current but risking damage if sustained. The datasheet mandates V+ be powered before signals and recommends series resistors or external diodes for overvoltage protection, per Figure 7.

ISL43L120IUZ-T Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Switch Circuit:: SPST - NO

Multiplexer/Demultiplexer Circuit:: 1:1

Number of Circuits:: 2

On-State Resistance (Max):: 250mOhm

Channel-to-Channel Matching (ΔRon):: 5mOhm

Voltage - Supply, Single (V+):: 1.65V ~ 3.6V

Voltage - Supply, Dual (V±):: -

Switch Time (Ton, Toff) (Max):: 25ns, 25ns

-3db Bandwidth:: -

Charge Injection:: -125pC

Channel Capacitance (CS(off), CD(off)):: 182pF, 182pF

Current - Leakage (IS(off)) (Max):: 3nA

Crosstalk:: -94dB @ 100kHz

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-MSOP

ISL43L120IUZ-T FAQ

1.How can I place an order for ISL43L120IUZ-T through Aetrix?

Please submit a Request for Quotation (RFQ) for ISL43L120IUZ-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ISL43L120IUZ-T reliable?

The price and inventory of ISL43L120IUZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL43L120IUZ-T is usually 5 days.

3.What payment methods are accepted for ISL43L120IUZ-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL43L120IUZ-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ISL43L120IUZ-T?

ISL43L120IUZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ISL43L120IUZ-T order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ISL43L120IUZ-T?

For technical support, including ISL43L120IUZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL43L120IUZ-T requirements.

6.How does Aetrix verify that ISL43L120IUZ-T is sourced from the original manufacturer or authorized distributors?

All ISL43L120IUZ-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL43L120IUZ-T meets industry standards.

7.What is the process for return or replacement of ISL43L120IUZ-T?

All ISL43L120IUZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL43L120IUZ-T, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ISL43L120IUZ-T part is unused and in its original packaging.

Return procedure for ISL43L120IUZ-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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