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Texas Instruments ESD321DPYR
- Part No.:
- ESD321DPYR
- Manufacturer:
- Texas Instruments
- Category:
- TVS Diodes
- Package:
- 0402 (1006 Metric)
- Datasheet:
-
ESD321DPYR.pdf
- Description:
- TVS DIODE 3.6VWM 6.8VC 2X1SON
- Quantity:
- Payment:
- Shipping:
Inventory:32,326
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Product details
Overview
ESD321DPYR from Texas Instruments is a unidirectional TVS ESD protection diode in X1SON (DPY) 2-pin package, rated for ±30kV IEC 61000-4-2 contact/air discharge, featuring 0.9pF typical IO capacitance, 4.5V minimum DC breakdown voltage, and 6.8V clamping voltage at 16A TLP - optimized for high-speed USB 2.0 and Ethernet 10/100/1000Mbps interface protection.
For engineers reviewing the ESD321DPYR datasheet, ESD321DPYR pinout, ESD321DPYR application, or ESD321DPYR equivalent, this device delivers ultra-low dynamic resistance (0.13Ω), industrial temperature operation (–40°C to +125°C), and flow-through routing compatibility with minimal PCB layout impact in space-constrained wearable and embedded systems.
Technical Context
The ESD321DPYR implements a snapback-triggered unidirectional TVS structure with low-leakage silicon avalanche design, enabling fast response (<10ns) to ESD transients while maintaining sub-1pF signal-line capacitance. Its I/O-to-GND configuration supports single-rail protection of 0–3.6V signaling interfaces without reverse-bias concerns.
It meets IEC 61000-4-2 Level 4 (±30kV), IEC 61000-4-4 (80A EFT), and IEC 61000-4-5 (6A surge) standards simultaneously, with clamping performance validated via 100ns TLP testing and insertion loss <0.5dB up to 10GHz - confirming suitability for 480Mbps USB 2.0 data integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Rating (IEC 61000-4-2) | ±30kV contact & air discharge - exceeds Level 4, enabling robust human-interface ESD immunity in consumer and industrial end equipment. |
| IO Capacitance | 0.9pF typical at 1MHz - preserves signal integrity on USB 2.0 (480Mbps) and 1Gbps Ethernet links with negligible insertion loss. |
| Clamping Voltage | 6.8V at 16A TLP (I/O to GND) - limits transient overvoltage to safe levels for 3.3V/3.6V I/O rails of protected ICs. |
| Dynamic Resistance | 0.13Ω (I/O to GND) - ensures low-voltage drop during high-current ESD events, minimizing stress on downstream circuitry. |
| DC Breakdown Voltage | 4.5V minimum - provides margin above 3.6V max operating voltage while avoiding false triggering during normal operation. |
| Leakage Current | 0.1nA typical at 3.6V - prevents signal degradation or power drain in battery-powered wearables and IoT sensors. |
| Operating Temperature | –40°C to +125°C - supports deployment in automotive infotainment, industrial robotics, and outdoor-connected devices. |
Pinout & Package
X1SON (DPY) 2-pin package: 1.0mm × 0.6mm footprint, 0.45mm max height, exposed thermal pad, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | I/O | ESD-protected signal line input - connects directly to USB D+/D−, GPIO, or Ethernet PHY pins requiring transient suppression. |
| 2 | GND | Low-inductance ground return path - must be routed to solid ground plane with minimal trace length to maintain clamping efficacy. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low clamping voltage | 6.8V at 16A TLP ensures protected ICs see minimal overvoltage during worst-case ESD strikes. |
| Sub-1pF line capacitance | 0.9pF typical enables use on 480Mbps USB 2.0 without signal rise-time degradation or eye-diagram closure. |
| Flow-through routing | Pin 1–2 orientation allows in-line placement between connector and IC with no trace detours or vias required. |
| Industrial temperature range | –40°C to +125°C operation supports reliability in thermally demanding environments like factory automation controllers. |
| Multi-standard compliance | Single-device coverage of IEC 61000-4-2 (ESD), -4-4 (EFT), and -4-5 (surge) reduces BOM count and validation effort. |
Applications
| USB 2.0 Interface Protection | Industrial GPIO Protection |
|---|---|
Use Scenario: Protecting D+/D− lines of USB 2.0 ports on laptops, tablets, and docking stations against user-handling ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between connector and USB transceiver, triggered only during overvoltage transients. Use Value: 0.9pF capacitance avoids signal integrity loss at 480Mbps; 6.8V clamping prevents damage to 3.3V USB PHY I/O cells. |
Use Scenario: Shielding microcontroller GPIOs connected to pushbuttons, encoders, or sensors in service robots and HMI panels. IC Role / Device Role / Timing Role: Standalone ESD shunt on each signal line, providing fail-safe protection without active control or power supply. Use Value: 0.1nA leakage preserves battery life in portable industrial tools; –40°C to +125°C rating ensures field reliability. |
| Ethernet 10/100/1000Mbps PHY Protection | Wearable Device Touch/Sensor Interface |
Use Scenario: Safeguarding differential pairs of Ethernet PHYs in set-top boxes, NVRs, and smart displays exposed to frequent handling. IC Role / Device Role / Timing Role: Per-line unidirectional protection on TX+/TX− and RX+/RX−, leveraging low capacitance to avoid skew or attenuation. Use Value: 0.9pF IO capacitance maintains impedance matching and jitter performance across 100MHz+ bandwidths. |
Use Scenario: Protecting capacitive touch controller inputs and biometric sensor lines in fitness trackers and medical wearables. IC Role / Device Role / Timing Role: Low-capacitance ESD clamp on analog front-end signal paths, preserving SNR and sensitivity. Use Value: Sub-1pF loading prevents distortion of small-signal AC waveforms; 0.13Ω RDYN ensures rapid energy dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESD324DPYR | Bi-directional configuration; same 0.9pF capacitance but higher 12V clamping voltage at 16A TLP. | Suitable for AC-coupled or dual-rail interfaces (e.g., audio lines, RS-485) where bidirectional transients occur. | Select ESD324DPYR only when protecting symmetric signals; ESD321DPYR remains optimal for unidirectional 0–3.6V DC-coupled interfaces. |
| TPD2E001DRYR | 0.75pF typical capacitance; lower 5.5V clamping at 16A TLP; identical DPY package and pinout. | Better suited for ultra-high-speed interfaces beyond USB 2.0 (e.g., MIPI D-PHY) due to lower capacitance and clamping. | Choose TPD2E001DRYR when tighter clamping or lower capacitance is critical; ESD321DPYR offers superior surge current rating (6A vs. 4A). |
Compared with ESD324DPYR and TPD2E001DRYR, ESD321DPYR delivers the best balance of low clamping voltage, high surge robustness (6A), and proven USB 2.0 compatibility - making it the preferred choice for cost-sensitive, high-volume 3.3V interface protection where unidirectional operation suffices.
Availability
ESD321DPYR is available at Aetrix Electronics and suitable for USB 2.0 interface protection, industrial GPIO hardening, and wearable sensor signal conditioning requiring stable component supply across high-mix production runs.
Supply support for ESD321DPYR 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
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and communications markets.
The ESD321DPYR belongs to TI's ESD protection diode product line, engineered specifically for ultra-low-capacitance, high-fidelity signal-line protection in space-constrained, high-speed digital interfaces.
FAQ
What is the maximum operating voltage supported by the ESD321DPYR?
The ESD321DPYR has a reverse stand-off voltage (VRWM) of 3.6V and a minimum DC breakdown voltage (VBRF) of 4.5V. It is designed for continuous operation on 0–3.6V signal lines such as USB 2.0 D+/D−, GPIO, and Ethernet PHY interfaces - ensuring reliable clamping only during transients while remaining non-conductive under normal bias.
Does the ESD321DPYR require external power or control signals to function?
No, the ESD321DPYR is a passive silicon avalanche TVS diode with no power or control pins. It operates autonomously: when voltage across its I/O and GND terminals exceeds ~4.5V, it snaps back into low-impedance conduction to divert ESD current to ground - fully compliant with IEC 61000-4-2 Level 4 without any supporting circuitry.
Can the ESD321DPYR be used on bidirectional signal lines like USB D+ and D−?
Yes - although unidirectional in structure, the ESD321DPYR is applied per line (one device per signal) in USB 2.0 designs, with Pin 1 (I/O) connected to D+ or D− and Pin 2 (GND) tied to system ground. Its low 0.9pF capacitance and 6.8V clamping ensure full-speed USB 2.0 (480Mbps) signal integrity is preserved without polarity constraints.
What is the thermal performance of the ESD321DPYR in the DPY package?
In the X1SON (DPY) package, the ESD321DPYR has a junction-to-board thermal resistance (RθJB) of 169.2°C/W and junction-to-ambient (RθJA) of 437.8°C/W. These values confirm effective heat dissipation through the exposed thermal pad to the PCB - critical for sustaining repeated 6A surge events without thermal runaway in compact layouts.
How does the ESD321DPYR compare to older ESD diodes in terms of PCB layout impact?
The ESD321DPYR uses a flow-through pinout (I/O–GND) in the 1.0mm × 0.6mm DPY package, enabling direct in-line placement between connector and IC with no trace stubs or vias. This eliminates the need for layout rework when upgrading from larger packages like SOD-523 or SOIC, reducing design cycle time and improving high-frequency ESD path inductance.
ESD321DPYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 0402 (1006 Metric)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 3.6V (Max)
- Voltage - Breakdown (Min):
- 4.5V
- Voltage - Clamping (Max) @ Ipp:
- 6.8V (Typ)
- Current - Peak Pulse (10/1000µs):
- 6A (8/20µs)
- Power - Peak Pulse:
- 40W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 0.9pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-X1SON (1x.60)
ESD321DPYR FAQ
1.How can I place an order for ESD321DPYR through Aetrix?
Please submit a Request for Quotation (RFQ) for ESD321DPYR 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 ESD321DPYR reliable?
The price and inventory of ESD321DPYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ESD321DPYR is usually 5 days.
3.What payment methods are accepted for ESD321DPYR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ESD321DPYR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ESD321DPYR?
ESD321DPYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ESD321DPYR 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 ESD321DPYR?
For technical support, including ESD321DPYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ESD321DPYR requirements.
6.How does Aetrix verify that ESD321DPYR is sourced from the original manufacturer or authorized distributors?
All ESD321DPYR 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 ESD321DPYR meets industry standards.
7.What is the process for return or replacement of ESD321DPYR?
All ESD321DPYR units undergo pre-shipment inspection (PSI). If there is an issue with ESD321DPYR, 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 ESD321DPYR part is unused and in its original packaging.
Return procedure for ESD321DPYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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