Renesas ISL84684IIZ-T

Overview

ISL84684IIZ-T from Intersil is a dual SPDT analog switch in a 10-ball chipscale package (2.0mm × 1.5mm), designed for low-voltage, single-supply operation from +1.8V to +4.5V. It delivers ultra-low ON resistance (0.21Ω at 2.7V), fast switching (t_ON = 43ns, t_OFF = 27ns), and guaranteed break-before-make timing - enabling high-fidelity signal routing in space-constrained portable audio, cellular baseband, and medical sensor interfaces.

For engineers reviewing the ISL84684IIZ-T datasheet, ISL84684IIZ-T pinout, ISL84684IIZ-T application, or ISL84684IIZ-T equivalent, this device supports 1.8V logic-compatible control, R_ON matching ≤0.05Ω between channels, and <0.32μW quiescent power - critical for battery-powered systems requiring minimal insertion loss and crosstalk below –105dB.

Technical Context

The ISL84684IIZ-T implements two independent, bidirectional SPDT switches with normally open (NO) and normally closed (NC) terminals per channel, configured as a dual 2:1 multiplexer. Its submicron CMOS process enables precise R_ON flatness (≤0.03Ω) and charge injection of only 200pC at 2.7V, preserving signal integrity across the full analog range (0V to V+).

Internal level shifters translate 1.8V logic inputs into full-rail gate drive for the analog switches, while ESD protection diodes (±2kV HBM) are integrated on all signal pins. The device requires strict supply sequencing (V+ before signals) and does not support bipolar supplies - its operation is strictly defined for single-ended 1.8–4.5V systems with analog signals bounded by GND and V+.

Key Specifications

Pinout & Package

ISL84684IIZ-T uses a 10-ball wafer-level chipscale package (WLCSP) with 0.5mm ball pitch in a depopulated 4×3 array (B2 and B3 unpopulated). Dimensions: 2.00mm × 1.50mm × 0.35mm height. RoHS-compliant matte tin termination.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4684EUB+ and TMUX1574RSVR, the ISL84684IIZ-T uniquely balances ultra-low R_ON, wide supply range, 1.8V logic compatibility, and guaranteed break-before-make - making it the most versatile choice for portable equipment where voltage headroom, PCB area, and signal fidelity are simultaneously constrained.

Availability

ISL84684IIZ-T is available at Aetrix Electronics and suitable for cellular handsets, portable medical devices, and battery-powered test equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for ISL84684IIZ-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 (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 ISL84684IIZ-T belongs to Intersil's ultra-low-R_ON analog switch product line, engineered specifically for portable electronics where minimal power consumption, tiny footprint, and high signal fidelity are mandatory design requirements.

FAQ

What is the maximum analog signal voltage range supported by the ISL84684IIZ-T?

The ISL84684IIZ-T supports an analog signal range from GND to V+, meaning the maximum allowable voltage at any NO, NC, or COM pin is equal to the applied V+ supply voltage - up to +4.5V. Signals exceeding V+ or falling below GND forward-bias internal ESD diodes, so proper supply sequencing (V+ powered before signals) is mandatory to avoid damage or leakage.

Does the ISL84684IIZ-T require external level shifting when driven by a 1.8V microcontroller?

No, the ISL84684IIZ-T does not require external level shifting. Its digital inputs are fully 1.8V CMOS-compatible, with guaranteed logic recognition at V_INH ≥1.4V and V_INL ≤0.5V across the full +1.8V to +4.5V supply range - enabling direct connection to 1.8V I/O banks of modern microcontrollers and baseband processors without added components.

How does the ISL84684IIZ-T ensure signal integrity during switching transitions?

The ISL84684IIZ-T ensures signal integrity via guaranteed break-before-make timing (≥2ns minimum), ultra-low charge injection (200pC typical), and exceptional R_ON flatness (≤0.03Ω). These features collectively minimize transient glitches, pop/click artifacts, and gain nonlinearity - critical for high-fidelity audio, precision sensor data acquisition, and RF signal routing where waveform fidelity must be preserved.

Can the ISL84684IIZ-T operate from a 1.5V supply?

The ISL84684IIZ-T is specified for operation from +1.8V to +4.5V. While functional behavior may occur below 1.8V, parameters including R_ON, switching speed, and logic threshold margins degrade significantly - and the datasheet does not guarantee performance below 1.8V. For reliable operation, the ISL84684IIZ-T must be supplied within its rated 1.8–4.5V range.

What thermal considerations apply to the ISL84684IIZ-T in high-current applications?

The ISL84684IIZ-T has a junction-to-ambient thermal resistance (θ_JA) of 91°C/W in its 10-ball chipscale package. With a continuous current rating of ±300mA per channel and maximum power dissipation <0.32μW, self-heating is negligible under normal conditions. However, at peak pulsed currents (±500mA, 1ms/10%), localized heating must be managed via PCB copper pour and thermal vias to maintain operation within the –40°C to +85°C ambient range.