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STMicroelectronics STUSB03EQR
- Part No.:
- STUSB03EQR
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
STUSB03EQR.pdf
- Description:
- IC TRANSCEIVER HALF 1/1 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,800
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Product details
Overview
STUSB03EQR from STMicroelectronics is a USB 2.0-compliant transceiver supporting full-speed (12 Mbps) and low-speed (1.5 Mbps) operation, featuring integrated 3.3 V LDO regulation from VBUS, 1.6 V to 3.6 V I/O supply compatibility, ±14 kV HBM ESD protection on D+/D−, and software-controllable re-enumeration for portable systems including MP3 players and cell phones.
For engineers reviewing the STUSB03EQR datasheet, STUSB03EQR pinout, STUSB03EQR application, or STUSB03EQR equivalent, key selection considerations include VIF voltage range (1.6–3.6 V), integrated D+ pull-up resistor with RSEL/CON control, suspend-mode current (≤100 µA), and QFN16 (3×3 mm²) package compatibility with space-constrained USB peripheral designs.
Technical Context
The STUSB03E implements dual-speed USB physical layer signaling with independent edge-rate control via SPD input and supports Sharing mode when VBUS is absent, enabling D+/D− line reuse with other serial protocols. Its internal voltage detector (VBUSDET) provides VBUS presence indication referenced to VIF.
It integrates bidirectional level translation between VIF (1.6–3.6 V) and USB signal domains, includes programmable pull-up enable logic (CON/RSEL), and delivers regulated 3.3 V ±10% output (VPU) for external speed-detect resistor biasing in low-speed mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB Speed Support | Full-speed (12 Mbps) and low-speed (1.5 Mbps); SPD pin selects edge rates per USB spec. |
| VIF Supply Range | 1.6 V to 3.6 V; enables direct interface with low-voltage microcontrollers in portable devices. |
| VBUS Input Range | 4 V to 5.5 V; powers transceiver and internal LDO; supports standard USB bus voltage tolerance. |
| ESD Protection | ±14 kV HBM on D+/D−; meets IEC-61000-4.2 Level 3; eliminates need for external TVS diodes in many designs. |
| Suspend Current (IBUS) | ≤100 µA at VBUS = 5.25 V; satisfies USB suspend-mode power budget for battery-powered endpoints. |
| D+ Pull-Up Resistance | 1.3 kΩ typical (900–1575 Ω idle, 1425–3090 Ω receive); complies with USB 2.0 ECN for 27% resistor tolerance. |
| Driver Output Resistance | 16 Ω typical; ensures controlled impedance drive into 15 Ω–24 Ω range for signal integrity compliance. |
Pinout & Package
STUSB03EQR is housed in a lead-free QFN16 package measuring 3 mm × 3 mm × 0.9 mm (max height), with exposed thermal pad (EP) connected to GND for enhanced thermal performance in compact USB peripheral layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SPD) | Speed selection input | Logic HIGH configures full-speed edge rates; LOW selects low-speed timing per USB 2.0 PHY layer. |
| 2 (RCV) | Receive data output | Single-ended logic-level output reflecting decoded USB differential data during receive mode. |
| 3 (VP), 4 (VM) | Differential I/O pair | VP/VM serve as driver inputs (OE# = L) or receiver outputs (OE# = H); match USB D+/D− polarity. |
| 5 (CON) | Internal pull-up control | Enables/disables internal D+ pull-up resistor; determines VPU output state for speed detection. |
| 6 (GND) | Ground reference | Common return for VIF, VBUS, and signal paths; connects to exposed thermal pad for thermal management. |
| 7 (SUS) | Suspend mode enable | Active-high input disables internal circuits to reduce IBUS to ≤100 µA during USB suspend state. |
| 8 (RSEL) | Pull-up resistor selection | Logic LOW disables internal D+ pull-up, requiring external 1.5 kΩ resistor tied to VPU and D+. |
| 9 (OE#) | Output enable (active-low) | Controls direction: OE# = L enables transmit; OE# = H forces receive-only mode with high-impedance drivers. |
| 10–11 (D−, D+) | USB differential data lines | Compliant I/O pins with 25 pF capacitance and ±50 mA drive capability; connect directly to USB connector. |
| 12 (VTRM) | 3.3 V reference output | Stable 3.3 V ±10% LDO output requiring 1.0 µF decoupling; supplies termination for VP/VM circuitry. |
| 13 (VPU) | Pull-up supply output | Provides 3.3 V ±10% bias for external low-speed speed-detect resistor; high-impedance when CON = 0. |
| 14 (VBUS) | USB bus supply input | Accepts 4–5.5 V from upstream port; powers internal LDO and VBUSDET comparator. |
| 15 (VIF) | System I/O supply input | 1.6–3.6 V reference for digital control pins (SPD, SUS, OE#, etc.); defines logic thresholds. |
| 16 (VBUSDET) | VBUS presence indicator | Open-drain output asserting HIGH when VBUS > 4.0 V; LOW when < 3.6 V; referenced to VIF. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.3 V LDO (VTRM) | Eliminates need for external regulator; powered directly from VBUS, simplifying BOM and layout. |
| Software-controlled re-enumeration | CON and RSEL pins allow host-side reset of USB device enumeration without hardware disconnect. |
| Sharing mode support | Enables D+/D− reuse with UART/I²C when VBUS is absent-reducing pin count in multi-protocol SoCs. |
| No power supply sequencing required | VIF and VBUS may be applied in any order; internal logic prevents latch-up or undefined states. |
| Low-power suspend operation | IBUS ≤100 µA in suspend mode meets USB 2.0 requirement for battery-powered peripherals. |
Applications
| USB Peripheral Controller Interface | Portable Media Device Connectivity |
|---|---|
|
Use Scenario: Microcontroller-based USB HID device (e.g., keyboard, mouse) interfacing to host PC via Type-A receptacle. IC Role / Device Role / Timing Role: Physical layer transceiver handling differential signaling, slew rate control, and VBUS detection per USB 2.0 specification. Use Value: Integrated D+ pull-up and VBUSDET eliminate two external components; QFN16 footprint saves PCB area in handheld enclosures. |
Use Scenario: MP3 player with USB mass storage class functionality for file transfer and charging. IC Role / Device Role / Timing Role: Bidirectional USB PHY managing full-speed data bursts and low-power suspend/resume transitions. Use Value: 1.6 V VIF compatibility allows direct connection to 1.8 V MCU I/O; ≤100 µA suspend current extends battery runtime. |
| Smartphone Accessory Adapter | Industrial USB Diagnostic Tool |
|
Use Scenario: USB-to-serial bridge in OTG-enabled smartphone accessory (e.g., barcode scanner dongle). IC Role / Device Role / Timing Role: USB transceiver enabling host-peripheral role switching while maintaining ESD robustness on exposed ports. Use Value: ±14 kV HBM on D+/D− protects against user-handling ESD; Sharing mode permits shared UART/USB routing on same PCB traces. |
Use Scenario: Field-deployable USB diagnostic tool connecting embedded PLCs or sensors to laptop for firmware update. IC Role / Device Role / Timing Role: Isolated USB endpoint providing reliable low-speed command/response communication in electrically noisy environments. Use Value: VBUSDET output enables automatic cable-insertion detection; no external level shifters needed for 3.3 V controller interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| FTDI FT230XS | Integrated USB-to-UART bridge IC (not transceiver-only); includes built-in EEPROM and clock generator. | Requires no external MCU; targets UART-to-USB conversion rather than PHY-layer control. | Select when replacing legacy UART peripherals with USB connectivity-adds protocol stack overhead but reduces firmware complexity. |
| TI TUSB2036 | USB 2.0 hub controller (3-port); includes integrated transceivers, repeater, and hub logic-not a standalone PHY. | Designed for multi-device downstream expansion, not single-endpoint interface. | Choose only for hub-based architectures; incompatible as drop-in replacement for STUSB03EQR's transceiver function. |
Compared with FT230XS and TUSB2036, STUSB03EQR provides minimal-footprint, MCU-managed USB PHY control without embedded protocol logic or hub functionality-making it optimal for resource-constrained, firmware-defined USB peripherals where direct register-level access to speed selection, suspend, and pull-up control is required.
Availability
STUSB03EQR is available at Aetrix Electronics and suitable for portable media devices, industrial diagnostic tools, smartphone accessories, and USB HID peripherals requiring stable component supply across long-lifecycle production programs.
Supply support for STUSB03EQR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering automotive, industrial, and consumer ICs with emphasis on energy efficiency and system integration.
The STUSB03E belongs to ST's USB interface product line, designed specifically for low-voltage, low-power USB 2.0 peripheral implementations in battery-operated and space-constrained portable electronics.
FAQ
What is the minimum VIF voltage required for STUSB03EQR to meet USB 2.0 full-speed timing?
The STUSB03EQR maintains full-speed (12 Mbps) compliance down to VIF = 1.6 V, as verified by AC electrical characteristics including TR/TF ≤20 ns (CL = 50 pF) and tPLH/tPHL ≤55 ns at that supply level. This enables direct interfacing with 1.8 V microcontrollers without level-shifting circuitry.
How does the CON pin affect VPU output behavior in low-speed mode?
When CON = 1 and RSEL = 0, VPU is actively driven to 3.3 V ±10% to bias an external 1.5 kΩ resistor between VPU and D− for low-speed detection. If CON = 0, VPU enters high-impedance state, disabling the pull-up path-ensuring correct bus idle state before enumeration.
Can STUSB03EQR operate without VBUS present, and what functionality remains active?
Yes-when VBUS is absent, STUSB03EQR enters Sharing mode: D+/D− become high-impedance, VBUSDET = LOW, and VPU is high-Z. All control pins (SPD, SUS, OE#, etc.) remain functional via VIF, allowing the host MCU to repurpose D+/D− as generic GPIO or alternate serial interface lines.
Is an external crystal or clock source required for STUSB03EQR operation?
No external clock source is required. STUSB03EQR uses the incoming USB data stream's embedded clock for timing recovery and does not contain an oscillator or require a crystal. All timing parameters-including rise/fall times and propagation delays-are internally generated and compliant with USB 2.0 full-speed and low-speed specifications.
STUSB03EQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- USB 2.0
- Number of Drivers/Receivers:
- 1/1
- Duplex:
- Half
- Receiver Hysteresis:
- 100 mV
- Data Rate:
- 12Mbps
- Voltage - Supply:
- 4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
STUSB03EQR FAQ
1.How can I place an order for STUSB03EQR through Aetrix?
Please submit a Request for Quotation (RFQ) for STUSB03EQR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STUSB03EQR reliable?
The price and inventory of STUSB03EQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STUSB03EQR is usually 5 days.
3.What payment methods are accepted for STUSB03EQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STUSB03EQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STUSB03EQR?
STUSB03EQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STUSB03EQR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STUSB03EQR?
For technical support, including STUSB03EQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STUSB03EQR requirements.
6.How does Aetrix verify that STUSB03EQR is sourced from the original manufacturer or authorized distributors?
All STUSB03EQR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STUSB03EQR meets industry standards.
7.What is the process for return or replacement of STUSB03EQR?
All STUSB03EQR units undergo pre-shipment inspection (PSI). If there is an issue with STUSB03EQR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STUSB03EQR part is unused and in its original packaging.
Return procedure for STUSB03EQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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