Renesas ISL43L712IR

Overview

ISL43L712IR from Intersil is a dual-channel differential SPST analog switch with one normally open (NO) and one normally closed (NC) switch, configurable as an SPDT, featuring ultra-low 0.16 Ω ON-resistance at 3 V, 13 ns switching times, and single-supply operation from +1.65 V to +3.6 V. It includes an inhibit pin to simultaneously disable both channels and targets space-constrained, battery-powered audio/video routing in mobile phones and portable medical devices.

For engineers reviewing the ISL43L712IR datasheet, ISL43L712IR pinout, ISL43L712IR application, or ISL43L712IR equivalent, key selection criteria include its 0.16 Ω R_ON at 3 V, 1.8 V logic compatibility, 8 kV HBM ESD rating, dual NO/NC topology with INH control, and TDFN-8 package footprint for high-density PCB layouts.

Technical Context

The ISL43L712IR implements a submicron CMOS process with 114 transistors, enabling bidirectional analog signal routing with minimal distortion. Its internal level shifters translate 1.8 V CMOS logic inputs (VINH ≥ 1.4 V, VINL ≤ 0.5 V at 3 V supply) into full-rail gate drive for the analog switches, ensuring robust switching across the entire 1.65–3.6 V supply range.

Each channel maintains precise R_ON matching (≤0.005 Ω) and flatness (≤0.008 Ω), critical for low-insertion-loss signal paths. The INH pin provides system-level fault containment by forcing both switches into the OFF state when pulled high, independent of individual IN control signals.

Key Specifications

Pinout & Package

ISL43L712IR is housed in an 8-lead 3×3 mm thin DFN (TDFN) package (PKG DWG L8.3x3A) with exposed thermal pad, optimized for compact portable designs and enhanced thermal dissipation (θ_JA = 110°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL43L210 and TMUX1574, the ISL43L712IR uniquely delivers SPDT-equivalent functionality with global inhibit in a 3×3 mm footprint and industry-leading 0.16 Ω R_ON, making it optimal for space- and performance-critical portable audio and medical signal routing.

Availability

ISL43L712IR is available at Aetrix Electronics and suitable for battery-powered handheld equipment, portable medical instrumentation, and audio/video signal routing requiring stable component supply and long-term lifecycle support.

Supply support for ISL43L712IR 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, designs high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The ISL43L712IR belongs to Intersil's ultra-low-R_ON analog switch family, engineered specifically for portable, battery-operated systems demanding minimal power loss, high-speed signal integrity, and compact packaging.

FAQ

What is the maximum supply voltage rating for the ISL43L712IR?

The ISL43L712IR has an absolute maximum V+ to GND rating of −0.3 V to +4.7 V. Its recommended operating range is +1.65 V to +3.6 V. Exceeding +4.7 V risks permanent damage due to internal ESD diode breakdown, while operation below +1.65 V degrades R_ON, switching speed, and logic threshold margins. Always apply V+ before applying any analog or digital signals to prevent latch-up.

How does the INH pin function in the ISL43L712IR?

The INH (Inhibit) pin on the ISL43L712IR is an active-high global disable control. When INH = V+, both the NO1 and NC2 switches are forced fully OFF regardless of the state of the IN pin. This provides hardware-level fault containment for safety-critical or mute-on-demand functions. When INH = GND, normal IN-controlled switching resumes. The pin draws <0.5 μA, enabling direct MCU GPIO drive without buffering.

Can the ISL43L712IR be used with a 1.8 V supply, and what performance changes occur?

Yes, the ISL43L712IR operates at 1.8 V supply, with R_ON increasing to 0.26 Ω and t_ON/t_OFF extending to 30 ns/25 ns. Logic thresholds adjust to VINH ≥ 1.0 V and VINL ≤ 0.4 V. All specifications remain valid across −40°C to +85°C. This makes ISL43L712IR compatible with 1.8 V I/O domains while retaining functional integrity in low-power modes.

What is the thermal resistance (θ_JA) of the ISL43L712IR in its TDFN-8 package?

The ISL43L712IR in the 8-lead 3×3 mm TDFN package has a typical junction-to-ambient thermal resistance (θ_JA) of 110°C/W under standard JEDEC test conditions (low-thermal-conductivity board, free air). This value assumes proper PCB layout with the exposed thermal pad soldered to a solid copper plane. Without thermal pad connection, θ_JA degrades significantly, risking thermal shutdown above 100 mA continuous current.

Does the ISL43L712IR support bidirectional analog signal flow?

Yes, the ISL43L712IR is fully bidirectional: analog signals can pass equally well from COM to NO/NC or from NO/NC to COM. Its CMOS transmission-gate architecture ensures symmetrical R_ON, capacitance, and charge injection in both directions. This enables flexible routing in audio line drivers, sensor interfaces, and differential data paths without polarity constraints.