ISL54216IRTZ - USB 2.0 HS/UART Dual SP3T Switch | Renesas
MPN: ISL54216IRTZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.98 | $1.98 |
| 10 | $1.78 | $17.80 |
| 100 | $1.58 | $158.00 |
| 500 | $1.35 | $675.00 |
| 1,000 | $1.12 | $1,120.00 |
ISL54216IRTZ Overview
A dual SP3T analog switch (also known as a dual 3-to-1 multiplexer) is an analog signal-routing IC that contains two independent SP3T switches, each capable of connecting a common terminal to one of three selectable throws. The SP3T topology belongs to the broader family of analog switches and multiplexers, sitting under interface ICs in the semiconductor hierarchy. The dual-SP3T configuration is purpose-built for the USB-plus-audio jack sharing architectures found in personal media players and other space-constrained portable electronics.
Key features include low on-resistance designed for high-speed USB signaling, break-before-make switching to prevent momentary shorts between adjacent channels, and operation directly from a single Li-ion cell voltage. The switch targets USB 2.0 high-speed (480 Mbps) data rates, requiring tight on-resistance matching and low capacitance to preserve signal integrity at the high-speed eye-pattern mask. The 3x3 mm TQFN-12 footprint is among the smallest available for a dual-channel USB switch, supporting compact PCB layouts in mobile devices.
The ISL54216IRTZ architecture uses paired N-channel MOSFET pass elements per throw, controlled by logic-level select inputs. The two channels are independent and may be controlled separately, enabling asymmetric routing such as routing USB on channel A while routing UART on channel B. The Renesas datasheet specifies typical on-resistance, off-isolation, and crosstalk parameters optimized for the 240 MHz fundamental frequency of USB 2.0 high-speed signaling.
Typical applications include personal media players and portable media devices that share a single connector between headphone audio and USB data, mobile phones with combined USB/audio jacks, USB/UART multiplexing in development boards, and accessory-detection circuits that need to discriminate between headphone insertion and USB cable insertion on the same pins. The wide operating supply range also supports direct Li-ion battery connection, eliminating the need for an LDO upstream.
When designing with this device, ensure the layout keeps USB data traces impedance-controlled (90 ohm differential) and short, and verify that break-before-make timing prevents cross-conduction when switching between USB and UART sources. The shared connector ground return must be designed to avoid ground bounce during mode transitions.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ISL54216IRTZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL54216IRTZ-T
✅ Drop-In📋 Reference alternative (not in catalog)
ISL54216EVALZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ISL54216IRTZ Maximum Ratings & Electrical Characteristics
| Switch Type | Dual SP3T (Dual 3-to-1 Multiplexer) |
| Number of Channels | 2 |
| Supply Voltage (Single) | 2.7 V to 4.6 V |
| Switched Signal | USB 2.0 High-Speed and/or UART differential pairs |
| USB Data Rate Support | USB 2.0 High-Speed (480 Mbps) |
| Switching Action | Break-before-make |
| Select Inputs | Logic-level (number of selects per channel per datasheet) |
| Package Type | TQFN-12 (3x3 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
ISL54216IRTZ Pin Configuration
| Pin 1 | IN1A — Channel A select input 1 (logic level) |
| Pin 2 | COM_A — Channel A common terminal |
| Pin 3 | NO1A — Channel A normally-open throw 1 (USB D+) |
| Pin 4 | NO2A — Channel A normally-open throw 2 (USB D-) |
| Pin 5 | NO3A — Channel A normally-open throw 3 (audio/UART) |
| Pin 6 | GND — Ground |
| Pin 7 | NO3B — Channel B normally-open throw 3 (audio/UART) |
| Pin 8 | NO2B — Channel B normally-open throw 2 (USB D-) |
| Pin 9 | NO1B — Channel B normally-open throw 1 (USB D+) |
| Pin 10 | COM_B — Channel B common terminal |
| Pin 11 | IN1B — Channel B select input 1 (logic level) |
| Pin 12 | VDD — Positive supply voltage (2.7V to 4.6V) |
Typical Applications
ISL54216IRTZ is suitable for 6 applications: Personal Media Player Headphone/USB Multiplexing, Mobile Phone Combined Headphone/USB Jack, USB/UART Development Board Routing, Accessory Detection and Mode Switching, Portable Battery-Powered USB Dongles, Audio/USB Switching in Wearable Devices.
Personal Media Player Headphone/USB Multiplexing
The ISL54216IRTZ's dual SP3T topology and USB 2.0 high-speed support make it ideal for personal media players that share a single connector between headphone audio output and USB data. According to the Renesas datasheet, the part multiplexes three differential sources per channel, allowing a portable device to automatically switch between headphone-mode and USB-mode on the same physical pins. Channel A can route the USB D+/D- pair while channel B handles UART or audio, all from a single 2.7V-4.6V Li-ion supply without an upstream LDO.
Recommended
Mobile Phone Combined Headphone/USB Jack
The ISL54216IRTZ is purpose-built for mobile phones with a combined headphone/USB jack, where the same connector pins must discriminate between 3-pole headphone insertion and 4-pole USB cable insertion. The dual SP3T configuration routes the TRRS contacts to either the audio CODEC or the USB transceiver based on accessory detection logic. Operating from a single 2.7V-4.6V supply eliminates the need for a boost converter or LDO in the signal path, improving overall power efficiency.
Recommended
USB/UART Development Board Routing
The ISL54216IRTZ is commonly used in development boards and evaluation kits where engineers need to switch a single set of debug pins between USB and UART functions. The dual SP3T topology allows two channels (e.g., one for USB D+/D-, one for UART TX/RX) to be independently routed to the same header, simplifying board bring-up. The 3x3 mm TQFN-12 footprint is friendly to compact dev-board layouts and breadboard-adapter designs.
Recommended
Accessory Detection and Mode Switching
The ISL54216IRTZ supports accessory-detection circuits that need to identify which type of plug is inserted (headphone vs USB cable) and route the connector contacts accordingly. The break-before-make switching action prevents momentary shorts between USB and audio paths during mode transitions. Each channel's three throws can be mapped to USB, UART, and audio-isolate states with selectable logic-level control from a host MCU.
Recommended
Portable Battery-Powered USB Dongles
The ISL54216IRTZ operates directly from a single Li-ion cell voltage (2.7V to 4.6V), making it well suited to USB dongles and small battery-powered peripherals that multiplex USB data with a secondary UART interface. The wide supply range supports designs that source power directly from VBUS or from an internal Li-ion cell without regulation, reducing BOM cost and board footprint. The 12-lead TQFN package is compatible with high-density 4-layer PCB layouts.
Recommended
Audio/USB Switching in Wearable Devices
The ISL54216IRTZ enables shared-connector designs in wearable electronics such as smartwatches and fitness trackers, where a single pogo-pin or USB-C connector must support both charging and headphone audio. The dual SP3T channels route the D+/D- pair during USB charging and switch to audio output during music playback. The 3x3 mm TQFN package and low quiescent current are ideal for wearable form factors where PCB area and battery life are critical constraints.
Recommended
Recommended Products Summary
Engineering reference data for ISL54216IRTZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL54216IRTZ-T | ISL54216EVALZ |
|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | TQFN-12 (3x3 mm) | TQFN-12 (3x3 mm) - same | TQFN-12 (3x3 mm) - same |
| Switch Type | Dual SP3T | Dual SP3T | Dual SP3T |
| Number of Channels | 2 | 2 | 2 |
| Supply Voltage | 2.7V to 4.6V | 2.7V to 4.6V | 2.7V to 4.6V |
| USB 2.0 High-Speed Support | Yes (480 Mbps) | Yes (480 Mbps) | Yes (480 Mbps) |
| Switching Action | Break-before-make | Break-before-make | Break-before-make |
| RoHS Compliant | Yes | Yes | Yes |
Key Differentiators
- True dual-SP3T topology in compact 3x3 mm TQFN (vs Single-channel SP3T switches)
- USB 2.0 High-Speed (480 Mbps) certified switching (vs Generic SP3T analog switches without USB optimization)
- Single-supply 2.7V to 4.6V operation (vs Dual-supply analog switches requiring +/-5V or 3.3V/5V rails)
Design Notes
The TQFN-12 (3x3 mm) package has an exposed thermal pad on the bottom that must be soldered to a PCB ground plane for both thermal dissipation and low-impedance ground return. Place at least four thermal vias in the exposed pad area connecting top-layer ground to inner ground layers. Keep USB data traces (D+/D-) impedance-controlled to 90 ohms differential and as short as possible to preserve the USB 2.0 high-speed eye-pattern mask.
Do not assume the ISL54216IRTZ handles USB Type-C CC or PD logic - it only switches legacy USB 2.0 data and UART signals. For native USB Type-C applications, pair it with a dedicated USB Type-C port controller such as CYPD3135-40LQXIT. Also verify that the select-input logic is valid before applying VDD; floating select pins at power-up may cause undefined switching states.
Estimated: At 240 MHz (USB 2.0 high-speed fundamental), the on-resistance of the ISL54216IRTZ pass elements introduces insertion loss in the switched path. Maintain 90-ohm differential impedance on USB D+/D- traces through the switch footprint and minimize stub lengths. If the design requires USB 2.0 high-speed certification, verify eye-pattern compliance with the switch in-circuit using a USB-IF compliance fixture.
Estimated: With VDD at 3.6V (Li-ion nominal) and the switch toggling between USB and UART modes, the supply current draw is typically sub-mA. A 0.1 uF decoupling capacitor placed within 2 mm of the VDD pin and a 10 uF bulk capacitor on the supply rail will provide clean switching transients. The break-before-make timing ensures no shoot-through current between adjacent throws during transitions.
Compliance Information
RoHS and REACH compliance per Renesas product page; not AEC-Q100 qualified (consumer/portable target market). Conflict-minerals compliance per Renesas corporate policy.
