Renesas ISL43120IH-T

Overview

ISL43120IH-T from Intersil is a dual normally-open (NO) single-pole/single-throw (SPST) analog switch IC designed for precision signal routing in low-voltage, single-supply systems. It operates from +2.7V to +12V, delivers 19Ω ON-resistance at 5V, 28ns turn-on time, <1Ω r_ON matching between channels, and 5pC max charge injection-enabling high-fidelity multiplexing in portable medical ultrasound front-ends.

For engineers reviewing the ISL43120IH-T datasheet, ISL43120IH-T pinout, ISL43120IH-T application, or ISL43120IH-T equivalent, key selection criteria include guaranteed break-before-make timing (not applicable), dual NO topology, SOT-23-8 package compatibility, and performance validation across 3.3V/5V/12V supply rails with full -40°C to +85°C operation.

Technical Context

The ISL43120IH-T implements CMOS-based bidirectional SPST switching with integrated level-shifting logic that accepts TTL/CMOS inputs (0.8V/2.4V thresholds) across its full 2.7–12V supply range. Its internal architecture uses matched P- and N-channel MOSFETs per switch to minimize r_ON flatness variation and leakage asymmetry.

Unlike the ISL43122, it lacks break-before-make functionality and does not support SPDT configuration. All analog pins feature ESD protection diodes to V+ and GND, requiring strict supply sequencing (V+ applied before signals) to prevent forward biasing and ensure 10nA max leakage at 5V.

Key Specifications

Pinout & Package

ISL43120IH-T is housed in an 8-lead SOT-23 package (JEDEC MO-178BA, Intersil P8.064), measuring 2.80 × 3.00 × 1.30 mm, with gull-wing leads and RoHS-compliant matte tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4618EUT+T and ADG721BRMZ-REEL7, the ISL43120IH-T uniquely supports full 2.7–12V operation with 19Ω r_ON and 5pC charge injection-making it the only option validated for both portable medical front-ends and 12V industrial test instrumentation.

Availability

ISL43120IH-T is available at Aetrix Electronics and suitable for battery-powered medical devices, portable test equipment, and high-fidelity audio routing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL43120IH-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 is a precision analog and power management semiconductor provider, now part of Renesas Electronics, with deep expertise in high-performance analog switching and signal conditioning.

The ISL43120IH-T belongs to Intersil's low-voltage analog switch family, engineered specifically for portable, battery-operated systems demanding ultra-low leakage, fast switching, and robust 2.7–12V single-supply operation.

FAQ

What is the maximum supply voltage rating for the ISL43120IH-T?

The ISL43120IH-T has an absolute maximum V+ to GND rating of 15V, with recommended operation from +2.7V to +12V. Operation at 12V is fully characterized, delivering 11Ω r_ON and 25ns t_ON. Exceeding 12V is not advised for long-term reliability, as electrical specifications are not guaranteed above this level. The ISL43120IH-T datasheet confirms 15V as the absolute limit, but design margins should respect the 12V maximum operating voltage.

Does the ISL43120IH-T support break-before-make switching?

No, the ISL43120IH-T does not support break-before-make (BBM) functionality. It is a dual normally-open (NO) SPST switch with independent channel control. BBM timing is explicitly specified only for the ISL43122 variant (NO/NC configuration). Using the ISL43120IH-T in SPDT-like configurations requires external logic to enforce BBM timing; the ISL43120IH-T itself provides no internal delay or overlap control between channels.

What is the typical ON-resistance matching between the two channels of the ISL43120IH-T?

The ISL43120IH-T guarantees r_ON matching (Δr_ON) of less than 1Ω typical at 5V supply, with a maximum of 4Ω across the full -40°C to +85°C temperature range. This tight matching is achieved through matched P/N MOSFET fabrication and is critical for applications like differential signal routing and programmable gain amplifier networks where channel imbalance directly impacts system accuracy. The ISL43120IH-T datasheet specifies this parameter under defined test conditions (V+ = 5V, I_COM = 1.0mA).

Can the ISL43120IH-T operate from a 3.3V supply, and what performance changes occur?

Yes, the ISL43120IH-T is fully specified at 3.3V supply, delivering 32Ω r_ON, 40ns t_ON, and 20ns t_OFF. While switching speed degrades versus 5V operation, its 3.3V compatibility enables direct integration with modern low-voltage microcontrollers and FPGAs. The ISL43120IH-T maintains all key specifications-including leakage (<5nA), charge injection (≤5pC), and off-isolation (76dB)-across the 3.3V/5V/12V range, ensuring consistent behavior in mixed-rail systems.

What package type and lead finish does the ISL43120IH-T use?

The ISL43120IH-T uses an 8-lead SOT-23 plastic package (JEDEC MO-178BA, Intersil P8.064) with RoHS-compliant 100% matte tin (e3) lead finish. This finish supports both SnPb and Pb-free soldering processes and meets IPC/JEDEC J-STD-020 moisture sensitivity level (MSL) requirements. The package measures 2.80 × 3.00 × 1.30 mm and is optimized for high-density PCB layouts in space-constrained portable electronics. The ISL43120IH-T marking "120Z" appears on the bottom of the device.