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Microchip Technology USB50403E3/TR7
- Part No.:
- USB50403E3/TR7
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
USB50403E3/TR7.pdf
- Description:
- TVS DIODE 3.3VWM 11VC SOT143
- Quantity:
- Payment:
- Shipping:
Inventory:4,256
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Product details
Overview
USB50403E3/TR7 from Microsemi is a unidirectional transient voltage suppressor (TVS) array in SOT-143 package, designed to protect one USB data line against ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and lightning-induced surges. It features 3.3 V standoff voltage (VWM), 4 V minimum breakdown (V(BR)), 8 V clamping at 1 A, 3 pF capacitance, and 500 W peak pulse power for 8/20 µs transients - enabling high-speed USB 2.0 signal integrity protection.
For engineers reviewing the USB50403E3/TR7 datasheet, USB50403E3/TR7 pinout, USB50403E3/TR7 application, or USB50403E3/TR7 equivalent, key selection criteria include unidirectional polarity, low 3 pF line capacitance for >900 Mbps USB data rates, RoHS-compliant matte-tin terminations, SOT-143 mechanical compatibility, and verified clamping performance under IEC-standard surge waveforms.
Technical Context
This TVS array employs a silicon avalanche diode structure optimized for fast response (<1 ns) to electrostatic discharge events while maintaining ultra-low capacitance. Its unidirectional configuration provides asymmetric conduction - forward-biased during normal operation and reverse-biased clamping during overvoltage - ensuring minimal signal distortion on high-speed differential lines like USB D+/D−.
The device operates across –55 °C to +150 °C junction temperature range and sustains 500 W peak pulse power per line under standardized 8/20 µs waveform testing. Its 3 pF capacitance at 1 MHz and 0 V bias enables compliance with USB 2.0 eye diagram requirements without degrading rise/fall times.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 3.3 V - maximum continuous operating voltage; must exceed USB data line DC bias to avoid leakage during normal operation |
| V(BR) @1 mA | 4 V min - ensures reliable triggering before damage to downstream USB transceivers |
| VC @1 A | 8 V max - limits transient voltage seen by protected IC to safe level during ESD event |
| Capacitance @1 MHz | 3 pF - preserves USB 2.0 signal integrity up to 480 Mbps with negligible insertion loss |
| PPP @8/20 µs | 500 W - withstands IEC 61000-4-2 Level 4 (±15 kV contact) and IEC 61000-4-4 burst energy |
| Leakage @VWM | 200 µA max - prevents excessive standby current in battery-powered USB peripherals |
| Polarity | Unidirectional - matches single-ended USB data line architecture; requires correct orientation on PCB |
Pinout & Package
SOT-143 surface-mount package with 4 terminals: Pin 1 (cathode/anode input), Pin 2 (ground), Pin 3 (anode/cathode output), Pin 4 (ground). Polarity defined by dot marking adjacent to Pin 1. Molded plastic case meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode of protection diode | Connects to protected USB data line (e.g., D+ or D−); cathode tied to ground via internal path |
| Pin 2 | Ground | Primary return path for surge current; must be low-inductance connection to system ground plane |
| Pin 3 | Cathode of protection diode | Internally connected to Pin 2; redundant ground terminal for improved thermal and EMI performance |
| Pin 4 | Ground | Second ground terminal; used in layout to minimize loop inductance during transient discharge |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional protection | Enables precise voltage threshold alignment with single-ended USB data line bias, avoiding false triggering during normal signal swings |
| 3 pF line capacitance | Maintains USB 2.0 signal fidelity by limiting capacitive loading to <0.1 UI degradation at 480 Mbps |
| 500 W peak pulse power | Supports full IEC 61000-4-2 Level 4 ESD immunity without derating in compact SOT-143 footprint |
| RoHS-compliant terminations | Matte-tin plating ensures solderability and intermetallic reliability in lead-free reflow profiles (260 °C / 10 s) |
Applications
| USB 2.0 Peripheral Ports | EIA-RS485 Data Links |
|---|---|
Use Scenario: Protection of upstream-facing USB ports on hubs, keyboards, or external storage enclosures exposed to user-handled connectors. IC Role / Device Role / Timing Role: Unidirectional TVS array placed directly at connector entry point to shunt ESD transients before reaching USB transceiver IC. Use Value: Prevents latch-up or gate oxide damage in USB PHYs by clamping ±15 kV contact ESD to ≤8 V within <1 ns. | Use Scenario: Board-level surge protection for industrial RS485 nodes deployed in factory automation or building control systems. IC Role / Device Role / Timing Role: Line protector on half-duplex RS485 bus segment, safeguarding driver/receiver inputs from induced lightning surges. Use Value: Enables 5 Mbps data rate operation while surviving 500 W, 8/20 µs transients per IEC 61000-4-4 Level 3. |
| 10BASE-T Ethernet Interfaces | HSIC Signal Lines |
Use Scenario: Transient suppression on legacy Ethernet PHY interfaces where cost-sensitive discrete protection is required. IC Role / Device Role / Timing Role: Single-line TVS on TX+/RX+ pairs of 10BASE-T magnetics secondary side. Use Value: Maintains 10 Mbps signal edge integrity with only 3 pF loading, avoiding timing skew between differential pairs. | Use Scenario: ESD hardening of High-Speed Inter-Chip (HSIC) USB 2.0 derivative links in mobile SoC-to-peripheral interconnects. IC Role / Device Role / Timing Role: Point-of-entry protection on HSIC D+ line, leveraging same electrical specs as USB 2.0 but with tighter layout constraints. Use Value: Delivers sub-1 ns response and 3 pF capacitance needed to preserve 480 Mbps HSIC eye opening in space-constrained mobile PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS array applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ3.3A | DO-214AC package; 600 W PPP; 15 pF capacitance; bidirectional configuration | Higher capacitance limits use to lower-speed interfaces (≤10 Mbps); larger footprint reduces routing density | Select when board space allows larger package and bidirectional protection suffices |
| TPD2E001DRYR | 2-channel unidirectional array in SOT-553; 3.6 V VWM; 1.5 pF per channel; 200 W PPP | Lower power rating restricts use to consumer-grade ESD-only environments (no EFT/lightning) | Choose for ultra-low-capacitance USB OTG ports where 200 W surge margin is acceptable |
Compared with SMAJ3.3A and TPD2E001DRYR, USB50403E3/TR7 uniquely balances 500 W surge capability, 3 pF capacitance, and SOT-143 size for USB 2.0 and industrial RS485 - offering higher robustness than ultra-low-C alternatives and better signal integrity than general-purpose TVS diodes.
Availability
USB50403E3/TR7 is available at Aetrix Electronics and suitable for USB 2.0 peripheral designs, industrial RS485 nodes, and 10BASE-T Ethernet interfaces requiring stable component supply with RoHS-compliant sourcing and traceable lot history.
Supply support for USB50403E3/TR7 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
Microsemi Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The USB504xx family was developed specifically for board-level ESD/EFT protection of high-speed serial interfaces - prioritizing low capacitance, precise unidirectional clamping, and compact SOT-143 packaging for USB, RS485, and Ethernet applications.
FAQ
What is the standoff voltage rating of USB50403E3/TR7?
The USB50403E3/TR7 has a standoff voltage (VWM) of 3.3 V, meaning it can sustain up to 3.3 V DC continuously across its protected line without significant leakage. This value is selected to match the nominal 3.3 V bias of USB 2.0 data lines while providing margin above typical signal swing, ensuring reliable operation without false triggering during normal data transmission.
Does USB50403E3/TR7 support IEC 61000-4-2 Level 4 ESD protection?
Yes, USB50403E3/TR7 supports IEC 61000-4-2 Level 4 ESD protection with a clamping voltage of 8 V at 1 A and 11 V at 5 A under 8/20 µs waveform conditions. Its 500 W peak pulse power rating and sub-1 ns response time enable it to safely divert ±15 kV contact and ±25 kV air-gap discharges away from sensitive USB transceivers without degradation.
Is USB50403E3/TR7 compatible with lead-free reflow soldering processes?
Yes, USB50403E3/TR7 features RoHS-compliant annealed matte-tin terminations rated for solder temperatures up to 260 °C for 10 seconds, fully compatible with standard lead-free reflow profiles. The SOT-143 package's thermal mass and plating composition ensure consistent wetting and intermetallic formation without voiding or dewetting.
How many signal lines does USB50403E3/TR7 protect?
USB50403E3/TR7 protects exactly one unidirectional signal line - such as a single USB D+ or D− line - using its integrated avalanche diode structure. It is not a multi-line array; each device guards one line, requiring separate placement for differential pair protection in USB or RS485 applications.
What is the capacitance of USB50403E3/TR7 and why does it matter for USB 2.0?
USB50403E3/TR7 exhibits 3 pF capacitance at 1 MHz and 0 V bias. This ultra-low value minimizes signal distortion and timing skew on USB 2.0 differential pairs operating at 480 Mbps, preserving eye diagram margins and preventing bit errors caused by excessive RC filtering or impedance mismatch at the connector interface.
USB50403E3/TR7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- TO-253-4, TO-253AA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 3.3V
- Voltage - Breakdown (Min):
- 4V
- Voltage - Clamping (Max) @ Ipp:
- 11V
- Current - Peak Pulse (10/1000µs):
- 5A (8/20µs)
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- Ethernet
- Capacitance @ Frequency:
- 3pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143
USB50403E3/TR7 FAQ
1.How can I place an order for USB50403E3/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for USB50403E3/TR7 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 USB50403E3/TR7 reliable?
The price and inventory of USB50403E3/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for USB50403E3/TR7 is usually 5 days.
3.What payment methods are accepted for USB50403E3/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for USB50403E3/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for USB50403E3/TR7?
USB50403E3/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your USB50403E3/TR7 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 USB50403E3/TR7?
For technical support, including USB50403E3/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your USB50403E3/TR7 requirements.
6.How does Aetrix verify that USB50403E3/TR7 is sourced from the original manufacturer or authorized distributors?
All USB50403E3/TR7 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 USB50403E3/TR7 meets industry standards.
7.What is the process for return or replacement of USB50403E3/TR7?
All USB50403E3/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with USB50403E3/TR7, 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 USB50403E3/TR7 part is unused and in its original packaging.
Return procedure for USB50403E3/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
USB50403E3/TR7 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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Diodes Incorporated
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