Renesas ISL43L841IRZ

Overview

ISL43L841IRZ from Intersil is a differential 4-to-1 analog multiplexer with ultra-low ON resistance (0.47 Ω at +4.3V), single-supply operation (1.65V to 4.5V), and guaranteed break-before-make switching. It supports rail-to-rail analog signals, handles 300mA continuous current per channel, and features 1.8V logic compatibility at +3V supply - ideal for battery-powered audio/video routing in portable medical and handheld devices.

For engineers reviewing the ISL43L841IRZ datasheet, ISL43L841IRZ pinout, ISL43L841IRZ application, or ISL43L841IRZ equivalent, key selection criteria include ON-resistance matching (≤0.12 Ω), low charge injection (−65 pC), fast switching (t_ON = 24 ns at +3.9V), and TQFN-16 package thermal performance (θ_JA = 75°C/W).

Technical Context

The ISL43L841IRZ implements a CMOS-based bidirectional analog switch architecture with dual differential outputs (COMA/COMB) and four matched input pairs (A0–A3, B0–B3). Its inhibit (INH) pin enables global channel disable, while ADD0/ADD1 address inputs select active paths with guaranteed break-before-make timing (≥4 ns).

Internal level shifters translate 1.8V-compatible logic thresholds (VINH ≥1.4V, VINL ≤0.4V at +3V) to drive analog gate terminals across the full 1.65V–4.5V supply range. ESD protection diodes (HBM >4kV) are integrated on all signal and logic pins, requiring proper supply sequencing (V+ applied before inputs) to avoid forward biasing.

Key Specifications

Pinout & Package

ISL43L841IRZ is housed in a 16-lead 3×3 mm thin quad flat no-lead (TQFN) package with exposed thermal pad (PKG DWG L16.3x3A). Pin 1 is marked by a mold or laser feature in the top-left corner; the exposed paddle must be connected to GND for optimal thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4782ETE+ and MAX4618EEE+, the ISL43L841IRZ delivers superior R_ON flatness (0.056 Ω), lower charge injection, and guaranteed break-before-make - making it the preferred choice for precision, low-glitch, battery-constrained designs.

Availability

ISL43L841IRZ is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered test equipment, and mobile audio subsystems requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for ISL43L841IRZ 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 semiconductor manufacturer specializing in precision analog, power management, and interface ICs for industrial, computing, and communications markets.

The ISL43L841IRZ belongs to Intersil's ultra-low-R_ON analog switch family, designed specifically for high-fidelity signal routing in space- and power-constrained portable electronics.

FAQ

What is the maximum continuous current rating per channel for the ISL43L841IRZ?

The ISL43L841IRZ supports 300mA continuous current per channel (A0–A3, B0–B3) under specified thermal conditions. This rating applies to both source and sink configurations when V+ is within 1.65V–4.5V and ambient temperature remains ≤85°C. Exceeding this current may increase R_ON drift or trigger thermal shutdown in sustained operation. The ISL43L841IRZ datasheet specifies peak pulsed current at ±500mA (1ms, 10% duty cycle).

Does the ISL43L841IRZ require external level-shifting when interfaced with 1.8V logic controllers?

No, the ISL43L841IRZ does not require external level-shifting when used with 1.8V logic controllers. Its digital inputs (ADD0, ADD1, INH) are 1.8V CMOS-compatible across the full +2.5V to +4.5V supply range, with guaranteed VINH ≥1.4V and VINL ≤0.4V at +3V supply. At +1.8V supply, VINH threshold drops to 1.0V - still compatible with standard 1.8V GPIO outputs. The ISL43L841IRZ integrates internal level shifters that translate logic levels to drive analog switch gates.

How does the ISL43L841IRZ ensure signal integrity during channel switching?

The ISL43L841IRZ ensures signal integrity through three key mechanisms: guaranteed break-before-make timing (≥4 ns), ultra-low charge injection (−65 pC at +1.8V), and matched R_ON (≤0.12 Ω between channels). These features minimize transient glitches, DC offset errors, and gain mismatch across multiplexed paths. Its 65dB off-isolation at 100kHz and −100dB crosstalk further prevent signal coupling between inactive and active channels - critical for high-precision applications like medical sensor front-ends.

What thermal management considerations apply to the ISL43L841IRZ in its TQFN-16 package?

The ISL43L841IRZ in its 3×3 mm TQFN-16 package (L16.3x3A) has a typical junction-to-ambient thermal resistance (θ_JA) of 75°C/W in free-air conditions. To maintain junction temperature ≤150°C, the PCB must provide adequate copper area connected to the exposed paddle (pin #16), which must be soldered to a solid GND plane. Thermal vias under the paddle are recommended. Power dissipation should remain below 120mW under continuous 300mA load to avoid exceeding thermal limits - verified using the ISL43L841IRZ's 0.47 Ω R_ON and ambient derating curves.

Can the ISL43L841IRZ operate from a 1.65V supply while maintaining full functionality?

Yes, the ISL43L841IRZ is fully specified to operate from a minimum supply of +1.65V, supporting rail-to-rail analog signals and valid logic thresholds (VINH ≥1.0V, VINL ≤0.4V). However, R_ON increases to 0.9 Ω max, switching times slow (t_ON = 55 ns), and R_ON flatness degrades to 0.14 Ω. All parameters remain functional per datasheet limits at −40°C to +85°C. For optimal performance, use ≥2.7V supply; the ISL43L841IRZ's 1.65V capability enables operation in deeply discharged Li-ion cells.