Renesas ISL54066IRTZ

Overview

ISL54066IRTZ from Intersil is a dual SPST normally open analog switch optimized for low-voltage, high-isolation signal routing in portable electronics. It operates from a single +1.8V to +6.5V supply, supports negative signal swing down to 6.5V below V+, delivers 1Ω r_ON at 4.3V, 80dB off-isolation, and 40ns/30ns switching times - enabling clean audio/video path switching in battery-powered handheld devices.

For engineers reviewing the ISL54066IRTZ datasheet, ISL54066IRTZ pinout, ISL54066IRTZ application, or ISL54066IRTZ equivalent, key selection criteria include verified negative-swing capability (V_IN = V₊ − 6.5V), T-switch architecture for isolation integrity, GND1/GND2 shunt resistor configuration, and µTQFN-10 package compatibility with space-constrained PCB layouts.

Technical Context

The ISL54066IRTZ implements a T-switch topology to achieve simultaneous low r_ON (1Ω typ. @ 4.3V) and high off-isolation (70–80dB), with independent digital control per channel (CTL1/CTL2). Its input/output shunt resistors (10kΩ to GND1 on INx, 200kΩ to GND2 on OUTx) require explicit grounding of GND1/GND2 to GND3 for activation.

Signal range extends from (V₊ − 6.5V) to V₊, enabling true bipolar operation without dual supplies; logic thresholds scale with V₊ (e.g., V_{CTL_H} = 1.6V min @ 4.3V, 1.0V min @ 1.8V), and leakage is dominated by ESD diode reverse bias currents under out-of-range conditions.

Key Specifications

Pinout & Package

ISL54066IRTZ is packaged in a 10-lead ultra-thin QFN (µTQFN) measuring 1.8mm × 1.4mm × 0.5mm, with exposed thermal pad tied to GND3 for thermal management and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMUX1574RTER and ADG732BRUZ-REEL7, ISL54066IRTZ uniquely combines true negative-swing capability (V_IN = V₊ − 6.5V), ultra-low 1Ω r_ON at 1.8V operation, and µTQFN-10 packaging - making it the sole option for space-constrained, battery-powered systems requiring bipolar signal routing without external level shifters.

Availability

ISL54066IRTZ is available at Aetrix Electronics and suitable for cellular handset audio routing, portable medical sensor multiplexing, laptop docking station video switching, and handheld test equipment signal conditioning requiring stable component supply across industrial temperature ranges (−40°C to +85°C).

Supply support for ISL54066IRTZ 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 ISL54066IRTZ belongs to Intersil's low-voltage analog switch product line, engineered specifically for portable and battery-operated systems demanding negative-swing capability, ultra-low r_ON, and minimal board area.

FAQ

What is the maximum allowable negative signal voltage for ISL54066IRTZ?

The ISL54066IRTZ supports analog input and output voltages down to (V₊ − 6.5V). For example, with V₊ = 3.3V, the minimum signal voltage is −3.2V; with V₊ = 1.8V, it is −4.7V. This capability is enabled by internal charge-pump circuitry and is validated across the full −40°C to +85°C operating range per the FN6584 datasheet.

Does ISL54066IRTZ require external pull-up or pull-down resistors on CTL1/CTL2?

No, ISL54066IRTZ does not require external pull-up or pull-down resistors on CTL1/CTL2. The digital inputs have defined logic thresholds (e.g., V_{CTL_H} ≥ 1.6V, V_{CTL_L} ≤ 0.5V at V₊ = 4.3V) and draw <0.63 µA input current. Driving directly from CMOS GPIOs meeting these voltage levels ensures reliable operation without added components.

How should GND1, GND2, and GND3 be connected for optimal off-isolation performance?

For optimal off-isolation, connect GND1, GND2, and GND3 to a common star ground point on the PCB - not daisy-chained. This prevents ground-current coupling between input and output shunt networks. The datasheet specifies that floating GND1 or GND2 disables their respective 10kΩ/200kΩ shunts, but star grounding maximizes isolation by eliminating shared impedance paths between signal domains.

Can ISL54066IRTZ operate reliably at 1.8V supply while switching 1VRMS audio signals?

Yes, ISL54066IRTZ operates reliably at 1.8V supply with 1VRMS audio signals. At V₊ = 1.8V, r_ON is 3Ω (typ.), THD+N is 0.04% at 1kHz, and −3dB bandwidth remains 30MHz. The device maintains 70dB off-isolation at 1MHz, and its negative swing capability allows full-swing AC signals centered at 0V without clipping or distortion.

What is the thermal resistance (θ_JA) of the ISL54066IRTZ µTQFN package?

The ISL54066IRTZ in the 10-lead µTQFN package has a typical junction-to-ambient thermal resistance (θ_JA) of 155°C/W, measured on a high thermal conductivity test board in free air. This value assumes proper soldering of the exposed thermal pad to a solid GND plane; adding thermal vias beneath the pad can reduce effective θ_JA by 20–30% in production layouts.