TS3USB221AQRSERQ1 - USB 2.0 1:2 Mux/Demux Switch | Texas Instruments
MPN: TS3USB221AQRSERQ1 ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
TS3USB221AQRSERQ1 Overview
A USB switch, also called a USB mux or DPDT analog switch, is a special-purpose analog switch IC that routes differential D+ and D- signal pairs from one USB host or controller to one of multiple downstream ports. In the system hierarchy, it sits between the USB PHY/controller and the USB connectors, complementing power management and ESD protection ICs in the connectivity signal chain. Such switches are essential when a hub or application processor has limited USB I/O ports that must be shared among several connectors.
Key features of the TS3USB221AQRSERQ1 include an on-resistance of 6 ohm maximum with a typical delta rON of 0.2 ohm, low ON-state capacitance of 6 pF maximum (CIO), and 1.8 V-compatible control-pin inputs that simplify interfacing with low-voltage GPIO. When the OE pin disables the device, it enters a low-power mode drawing only 1 uA, and total power consumption is 30 uA maximum, which is critical for battery-powered designs.
The integrated ESD protection is rated above 2000 V per the Human-Body Model (HBM), reducing the need for external transient-suppression diodes on the USB lines. The wide 1 GHz-class bandwidth allows USB 2.0 signals to pass with minimum edge and phase distortion, preserving eye-diagram margin at 480 Mbps. As an AEC-Q100 qualified device (TS3USB221A-Q1 family), it is validated for automotive ambient temperature ranges and supports automotive USB hubs and charging ports.
Typical applications include automotive USB hubs and infotainment ports, cell phones and handsets, digital cameras, and notebooks where a hub or controller has limited USB I/Os that must be multiplexed between connectors.
Design consideration: keep the switch close to the USB connector, match the differential pair layout through the device, and verify that the select (S) and enable (OE) logic levels are compatible with your controller GPIO; unused channel stubs should be minimized to preserve signal integrity.
This page synthesizes distributor listings, cross-reference tooling, and drop-in alternative analysis not found in the manufacturer datasheet alone.
Drop-in alternatives for TS3USB221AQRSERQ1 — 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:
TS3USB221ARSER
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TS3USB3000RSER
✅ Drop-In📋 Reference alternative (not in catalog)
TS3USB221AQRSERQ1 Maximum Ratings & Electrical Characteristics
| Function | USB 2.0 1:2 Multiplexer/Demultiplexer Switch |
| Channels | 2 (differential DPDT) |
| Data Rate | 480 Mbps (USB 2.0 High-Speed) |
| Bandwidth | 1 GHz typical (900 MHz, TS3USB221A-Q1) |
| Supply Voltage Range | 2.3 V to 3.6 V |
| I/O Signal Range | Up to 5.5 V |
| On-Resistance (RON) | 6 ohm maximum |
| Delta On-Resistance | 0.2 ohm typical |
| I/O Capacitance (CIO ON) | 6 pF maximum |
| Power Consumption | 30 uA maximum |
| Low Power Mode Current | 1 uA (OE disabled) |
| Control Input Compatibility | 1.8 V compatible control-pin inputs |
| ESD Protection | > 2000 V Human-Body Model (HBM) |
| Enable | Single enable (OE), active high |
| Qualification | AEC-Q100 (automotive grade) |
| Package | 10-UQFN (2.0 mm x 1.5 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead Free Status | Lead Free |
TS3USB221AQRSERQ1 10-uqfn (2.0 mm x 1.5 mm) Pin Configuration Guide
Pin configuration for TS3USB221AQRSERQ1 (10-uqfn (2.0 mm x 1.5 mm) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for TS3USB221AQRSERQ1.
Refer to the datasheet for full pin configuration.
Typical Applications
TS3USB221AQRSERQ1 is suitable for 6 applications: Automotive USB Hubs and Infotainment Ports, Smartphones and Handsets, Notebooks with Limited USB Controller I/Os, Digital Cameras and Portable Media Devices, USB OTG Host/Device Port Sharing, Test and Measurement USB Routing.
Automotive USB Hubs and Infotainment Ports
The TS3USB221AQRSERQ1 is explicitly designed, per the TI TS3USB221A-Q1 product page, for switching high-speed USB 2.0 signals in automotive USB hubs or controllers with limited USB I/Os. Its AEC-Q100 qualification addresses automotive temperature and reliability requirements, while the 900 MHz bandwidth preserves USB 2.0 eye margins at 480 Mbps across the extended channel. Integrated ESD protection above 2000 V HBM on the switch I/O helps ports survive handling transients. In a typical head-unit or hub design, the S (select) pin, driven by the SoC GPIO at 1.8 V logic, steers the host D+/D- pair to either a front console port or a rear charge port; the OE pin forces a 1 uA low-power state when USB is dormant, protecting battery drain in key-off conditions.
Recommended
Smartphones and Handsets
In handsets, a single USB controller often must serve both the main USB-C or micro-USB connector and a secondary accessory port. The TS3USB221AQRSERQ1 fits this role because its 2.3 V to 3.6 V supply matches typical phone battery-backed rails, and its 1.8 V compatible S/OE control inputs connect directly to baseband or application-processor GPIO without level shifting. The 1 GHz-class bandwidth with only 6 pF maximum CIO keeps insertion loss and edge degradation within the USB 2.0 compliance budget even with 90-ohm differential routing. The compact 10-UQFN 2.0 x 1.5 mm footprint fits dense mainboard regions near the connector, and the 30 uA maximum operating consumption plus 1 uA disabled state preserves standby battery life in an always-connected device.
Recommended
Notebooks with Limited USB Controller I/Os
TI's datasheet identifies notebooks with hubs or controllers having limited USB I/Os as a primary TS3USB221 use case. A notebook platform may expose multiple physical USB-A ports from a chipset that provides only one high-speed pair per root hub lane; the TS3USB221AQRSERQ1 multiplexes that pair between two connectors, selected by an embedded-controller GPIO. The wide bandwidth (1 GHz typical) allows signals to pass with minimum edge and phase distortion, per the datasheet description, which matters after the additional trace length inside a notebook chassis. The 5.5 V tolerant I/O accepts over-voltage conditions on the connector side, and the delta rON of 0.2 ohm typical minimizes differential skew that would otherwise degrade eye diagrams across long motherboard routing.
Recommended
Digital Cameras and Portable Media Devices
Digital cameras frequently share one USB controller between the main data connector and a dock or AV accessory interface. The TS3USB221AQRSERQ1 routes the camera's USB 2.0 D+/D- pair to whichever port is active, using a mechanical-detect or SoC-driven select signal. Its low-power behavior is central here: when OE is disabled the switch draws 1 uA, so an idle camera in the bag does not drain the battery through the mux. The 10-UQFN package fits camera module boards where vertical clearance is limited, and the switch's passive bidirectional architecture supports OTG role swapping without firmware changes. The 6 ohm maximum RON contributes only modest insertion loss, keeping 480 Mbps signaling compliant over camera-internal flex cabling.
Recommended
USB OTG Host/Device Port Sharing
USB On-The-Go systems use the same physical port as either host or device; designs also commonly mux one PHY between a connector and an internal peripheral such as a Wi-Fi module operating over USB. The TS3USB221AQRSERQ1 serves as the passive steering element because it is a bidirectional analog switch with no protocol awareness - data direction changes transparently. The single enable (OE) with active-high control simplifies sequencing: hold OE low to isolate rails during power-up, then assert it after VBUS and VCC stabilize. With VI/O tolerance up to 5.5 V, VBUS transient presence on the D+/D- lines (for example from legacy chargers) does not damage the switch. The 2000 V HBM ESD rating adds robustness during connector mating events.
Recommended
Test and Measurement USB Routing
Instrument front panels and docked test fixtures often need a single USB 2.0 controller to address multiple connectors - a front-panel port for user access and a rear-panel port for rack integration. The TS3USB221AQRSERQ1 provides deterministic, electronically controlled selection with 1.8 V logic inputs compatible with FPGA or MCU supervisory banks. Its 900 MHz A-Q1 bandwidth and 6 pF maximum CIO maintain signal integrity at 480 Mbps through the switch and panel cabling, and the low delta rON of 0.2 ohm typical keeps skew within specification for long differential runs. Because the device is AEC-Q100 qualified, it also suits ruggedized industrial instruments exposed to wide ambient temperatures, and its 30 uA maximum draw is negligible against instrument standby budgets.
Recommended
Recommended Products Summary
Engineering reference data for TS3USB221AQRSERQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TS3USB221ARSER | TS3USB3000RSER |
|---|---|---|---|
| Package | 10-UQFN (2.0x1.5 mm) | 10-UQFN (2.0x1.5 mm) - same | 10-UQFN (2.0x1.5 mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Automotive Qualification | AEC-Q100 qualified | No (commercial grade) | No |
| I/O Signal Tolerance | Up to 5.5 V | Up to 5.5 V | Positive and negative signaling via VNEG |
| Negative Rail Generator | No | No | Yes (integrated VNEG) |
Key Differentiators
- AEC-Q100 automotive qualification (vs TS3USB221ARSER)
- Lower footprint and 5.5 V tolerant I/O (vs TS3USB30RSWR)
- 1 uA standby vs added complexity of rail generation (vs TS3USB3000RSER)
Design Notes
Route the D+/D- differential pairs as 90-ohm matched traces through the switch and place the TS3USB221AQRSERQ1 as close to the USB connector as possible to minimize stub length of the unused channel. The 6 pF maximum CIO and 900 MHz bandwidth leave USB 2.0 eye-diagram margin at 480 Mbps, but every additional 10 mm of unmatched or stubbed trace consumes that margin. Avoid vias in the differential path where possible, and keep a continuous ground plane beneath the pairs.
Decouple VCC with a 100 nF ceramic capacitor placed within 2 mm of the supply pin. The device draws 30 uA maximum when active and 1 uA with OE disabled, so supply sequencing is not critical, but hold OE low during power-up to keep the switch isolated until VCC is valid. The 1.8 V-compatible control inputs can be driven directly by low-voltage GPIO; do not exceed the 5.5 V I/O signal tolerance on D+/D- lines in normal operation.
Do not assume the commercial TS3USB221ARSER and automotive TS3USB221AQRSERQ1 differ only in temperature grade - always pull the correct A-Q1 datasheet version for automotive derating analysis. Also, although a TI E2E forum thread confirms D+/D- polarity swapping is electrically possible through this passive switch, polarity must be swapped consistently at both ends of the link; verify the routing scheme in system-level compliance testing before production.
Compliance Information
RoHS Compliant and Lead Free per distributor specification listing (digchip datasheet summary). AEC-Q100 qualified per TI TS3USB221A-Q1 product page. REACH and halogen-free status not stated in provided data.
