Renesas ISL54400IRZ

Overview

ISL54400IRZ from Intersil is a low-voltage dual SPDT analog switch integrating USB 2.0 full-speed (12 Mbps) and stereo audio switching in a single 10-pin TDFN package. It supports negative-swing audio signals (±1.5 V), delivers <0.007% THD+N at 12 mW into 32 Ω, and features integrated VBUS detection and 3.3 V VTERM generation for USB speed setting - enabling shared USB/audio jack designs in portable media players.

For engineers reviewing the ISL54400IRZ datasheet, ISL54400IRZ pinout, ISL54400IRZ application, or ISL54400IRZ equivalent, key selection criteria include VBUS-controlled auto-switching logic, dual-path isolation (-110 dB crosstalk), sub-1 Ω audio R_ON, 5 Ω USB R_ON, and operation across -40°C to +85°C with 2.5–3.6 V supply.

Technical Context

The ISL54400IRZ implements two independent SPDT switch paths: one pair of 1 Ω normally-closed (NC) audio switches (L/R) and one pair of 5 Ω normally-open (NO) USB switches (D+/D−), both supporting bidirectional signal flow. Its VBUS-sensing input (pin 2) directly controls mode selection without external logic.

When VBUS ≤ VDD + 0.2 V, audio paths are active and USB paths are high-Z; when VBUS ≥ VDD + 0.8 V, USB paths engage and audio paths disable. The VTERM output (pin 10) sources 3.3–4.0 V only during USB mode, driving a 3 kΩ pull-up on D+ for full-speed USB identification.

Key Specifications

Pinout & Package

ISL54400IRZ is housed in a Pb-free, RoHS-compliant 10-lead 3 mm × 3 mm Thin DFN (TDFN) package (PKG DWG # L10.3x3A) with exposed paddle thermally connected to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual SPDT USB/audio switching applications.

Compared with ISL54401IRZ, the ISL54400IRZ adds VTERM generation for autonomous USB enumeration; compared with TMUX1574PWR, it eliminates GPIO dependency and reduces external component count but operates only within 2.5–3.6 V.

Availability

ISL54400IRZ is available at Aetrix Electronics and suitable for personal media players, smartphone accessory interfaces, and portable USB-peripheral audio systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL54400IRZ 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 (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for portable, industrial, and communications applications.

The ISL54400IRZ belongs to Intersil's low-voltage analog switch product line, designed specifically to enable space-constrained, battery-powered devices that require seamless coexistence of USB data and high-fidelity audio on shared connectors.

FAQ

What is the primary function of the ISL54400IRZ in portable device design?

The ISL54400IRZ serves as an automatic dual SPDT analog switch that enables a single physical connector to alternate between USB 2.0 full-speed data transmission and stereo audio playback. It uses VBUS detection to autonomously route signals-activating audio paths when no USB host is present and switching to USB paths when VBUS is detected-eliminating the need for firmware-based mode selection in devices like MP3 players and smartphones.

Does the ISL54400IRZ require external components to implement USB speed identification?

No. The ISL54400IRZ integrates a VTERM generator on pin 10 that outputs 3.3–4.0 V during USB mode, directly driving a 3 kΩ pull-up resistor on D+ for full-speed USB enumeration. This eliminates the need for an external LDO, voltage reference, or discrete resistor network typically required for USB speed signaling.

Can the ISL54400IRZ handle audio signals that swing below ground?

Yes. The ISL54400IRZ supports analog signal swings from -1.5 V to +1.5 V on its audio paths (L/R), allowing true ground-referenced headphone outputs without AC-coupling capacitors. This capability is confirmed by its <0.007% THD+N specification at 12 mW into 32 Ω and explicit -1.5 V minimum analog signal range in the datasheet.

How does the ISL54400IRZ manage power sourcing between audio and USB modes?

In audio mode, the ISL54400IRZ draws power from VDD (pin 1, 2.5–3.6 V). In USB mode, it derives operating power from the VBUS line (pin 2, 4.4–5.25 V), automatically transitioning supply domains without external circuitry. This dual-supply architecture ensures reliable operation regardless of host connection state.

Is the ISL54400IRZ pin-compatible with other members of the ISL5440X family?

Yes. The ISL54400IRZ shares identical pinout, package (10-lead 3×3 mm TDFN), and core switching functionality with ISL54401IRZ and ISL54402IRZ. However, ISL54401IRZ omits VTERM, and ISL54402IRZ replaces VBUS control with logic-level IN pins - so direct substitution requires verification of VTERM and control-scheme compatibility in the target design.