Renesas ISL43L120IR

Overview

ISL43L120IR 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 in space-constrained mobile phones and medical handhelds.

For engineers reviewing the ISL43L120IR datasheet, ISL43L120IR pinout, ISL43L120IR application, or ISL43L120IR equivalent, key selection criteria include its 8-lead 3×3 mm TDFN package, dual NO topology, sub-0.2Ω R_ON across 1.65–3.6V, <0.12µW quiescent power, and 8kV HBM ESD rating-critical for battery-powered ASIC interface expansion.

Technical Context

The ISL43L120IR implements bidirectional CMOS SPST switching using matched P/N transistor pairs per channel, with integrated level shifters enabling 1.8V logic compatibility across its full 1.65–3.6V supply range. Its architecture ensures R_ON matching of ≤0.005Ω and flatness of ≤0.008Ω over signal range, minimizing harmonic distortion in analog paths.

Supply sequencing is enforced via internal ESD diodes tied to V+ and GND on all I/O pins; operation requires V+ applied before signal inputs. The device lacks bipolar supply capability and relies on single-supply rail-referenced gate drive-making it unsuitable for split-rail or negative-voltage signal chains.

Key Specifications

Pinout & Package

ISL43L120IR uses an 8-lead 3×3 mm thin DFN (TDFN) package (JEDEC MO-WEEC-2 compliant), with exposed thermal pad for enhanced power dissipation and PCB-level EMI suppression. Pin 1 identifier is marked via mold feature in top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4617EUA+ and TMUX1574RTER, the ISL43L120IR uniquely balances ultra-low R_ON, 1.65V minimum supply, and guaranteed 1.8V logic compatibility in a thermally enhanced TDFN-making it optimal for next-gen wearable and medical devices where voltage headroom and signal integrity are constrained.

Availability

ISL43L120IR is available at Aetrix Electronics and suitable for battery-powered handheld equipment, portable test instrumentation, and medical monitoring devices requiring stable component supply with RoHS-compliant packaging and long-lifecycle support.

Supply support for ISL43L120IR 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 IC designer known for high-performance power management, precision analog, and interface solutions.

The ISL43L120IR belongs to Intersil's ultra-low-voltage analog switch family, engineered specifically for signal integrity preservation in space- and power-constrained portable electronics-prioritizing R_ON, speed, and supply flexibility over cost-driven general-purpose use.

FAQ

What is the maximum analog signal voltage range supported by the ISL43L120IR?

The ISL43L120IR supports an analog signal range from 0V to V+, where V+ is the positive supply voltage. With V+ operating from +1.65V to +3.6V, the signal range is correspondingly 0V to +3.6V maximum. Exceeding V+ or going below GND risks forward-biasing internal ESD diodes, so signal clamping must be implemented externally if overvoltage conditions are possible.

Does the ISL43L120IR support true bidirectional signal flow?

Yes, the ISL43L120IR is fully bidirectional: signals can pass equally well from COM to NO or NO to COM, with identical R_ON, leakage, and capacitance characteristics in both directions. This is inherent to its CMOS transmission-gate architecture and confirmed in the datasheet's "Detailed Description" and electrical test conditions.

Can the ISL43L120IR operate reliably at 1.65V supply while maintaining specified R_ON and switching speed?

Yes-the ISL43L120IR is fully characterized down to 1.65V. At this minimum supply, R_ON rises to 0.4Ω (max) and t_ON/t_OFF increases to 45ns/40ns (max), both guaranteed across temperature. These values remain within specification limits defined in the Electrical Specifications tables for 1.8V supply conditions.

What is the thermal resistance (θ_JA) of the ISL43L120IR in its 8-lead TDFN package?

The ISL43L120IR in the 8-lead 3×3 mm TDFN package has a typical junction-to-ambient thermal resistance (θ_JA) of 110°C/W, measured on a low-thermal-conductivity test board in free air. This value assumes standard PCB copper area per JEDEC standards; adding thermal vias under the exposed pad reduces θ_JA significantly in production layouts.

Is the ISL43L120IR pin-compatible with other members of the ISL43L12X family?

Yes-the ISL43L120IR shares identical pinout, package dimensions, and footprint with ISL43L121IR and ISL43L122IR. All three variants use the same 8-lead TDFN (L8.3x3A) package and pin assignments (IN1, IN2, COM1, COM2, NO1/NC1, NO2/NC2, V+, GND), enabling direct substitution where functional topology (NO/NO vs NC/NC vs NO/NC) matches system requirements.