My Inquiry
My Account
Texas Instruments ESD321DYAR
- Part No.:
- ESD321DYAR
- Manufacturer:
- Texas Instruments
- Category:
- TVS Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
ESD321DYAR.pdf
- Description:
- 0.8-PF 3.3-V 30-KV ESD PROTECTIO
- Quantity:
- Payment:
- Shipping:
Inventory:56,160
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ESD321DYAR from Texas Instruments is a unidirectional TVS diode engineered for high-speed signal line ESD protection, featuring 0.9pF typical IO capacitance, ±30kV IEC 61000-4-2 contact/air discharge rating, and 6.8V clamping voltage at 16A TLP (I/O to GND). It operates across –40°C to +125°C and is optimized for USB 2.0, Ethernet, and GPIO interfaces in space-constrained portable electronics.
For engineers reviewing the ESD321DYAR datasheet, ESD321DYAR pinout, ESD321DYAR application, or ESD321DYAR equivalent, this device delivers verified low-capacitance transient suppression with validated clamping performance, industrial temperature operation, and SOD-523 package compatibility for high-density PCB layouts.
Technical Context
The ESD321DYAR implements a snapback-triggered unidirectional TVS structure with 0.13Ω dynamic resistance (I/O to GND), enabling rapid voltage clamping during ±30kV ESD events. Its DC breakdown voltage is ≥4.5V and holding voltage is 5.1V, ensuring robust protection without false triggering on 3.6V logic rails.
It meets IEC 61000-4-4 (80A EFT) and IEC 61000-4-5 (6A surge, 8/20µs) standards while maintaining sub-1pF capacitance - critical for preserving signal integrity up to 240MHz in USB 2.0 data paths. The SOD-523 (DYA) package supports flow-through routing with minimal trace stubs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Rating (IEC 61000-4-2) | ±30kV contact & air discharge - exceeds Level 4, suitable for handheld and industrial equipment exposed to direct human handling. |
| Clamping Voltage (I/O–GND) | 6.8V at 16A TLP - limits stress on downstream ICs during fast transients, enabling reliable protection of 3.3V/3.6V interface receivers. |
| IO Capacitance | 0.9pF typical - preserves signal rise/fall times and insertion loss <0.5dB up to 1GHz, essential for USB 2.0 (480Mbps) and 1000BASE-T Ethernet. |
| Dynamic Resistance | 0.13Ω (I/O to GND) - minimizes voltage overshoot during high-current ESD pulses by reducing IR drop across the protection path. |
| Leakage Current | 0.1nA typical at 3.6V - avoids loading sensitive analog or low-power digital inputs, supporting battery-operated wearables and IoT sensors. |
| Operating Temperature | –40°C to +125°C - qualified for automotive cabin modules, industrial controllers, and embedded systems requiring extended thermal range. |
| Package | SOT-5X3 (DYA), 1.6mm × 0.8mm - industry-standard SOD-523 footprint with exposed pad option, compatible with standard reflow profiles (MSL Level-3). |
Pinout & Package
SOT-5X3 (DYA) package: 2-pin surface-mount, 1.6mm × 0.8mm body, 0.77mm max height, with flow-through layout enabling straight trace routing between connector and protected IC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Direct connection to system ground plane; serves as current return path during ESD events and establishes reference for clamping action. |
| 2 | I/O | Protected signal line input (e.g., USB D+, Ethernet TX+, GPIO); connects to external interface and triggers diode conduction when voltage exceeds VBRF. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low clamping voltage | 6.8V at 16A TLP ensures protected ICs see minimal overvoltage - critical for safeguarding 3.3V USB transceivers and Ethernet PHYs. |
| Sub-1pF line capacitance | 0.9pF typical enables full-speed USB 2.0 compliance without signal degradation or timing skew in differential pairs. |
| Low dynamic resistance | 0.13Ω (I/O–GND) reduces clamping voltage rise under high di/dt, improving protection margin against fast-rising ESD pulses. |
| Industrial temperature range | –40°C to +125°C operation supports deployment in robotics, set-top boxes, and automotive infotainment without derating. |
| IEC-compliant multi-threat protection | Validated for ESD (±30kV), EFT (80A), and surge (6A, 8/20µs) - eliminates need for separate protection stages in cost-sensitive designs. |
Applications
| USB 2.0 Interface Protection | Ethernet 10/100/1000 Mbps |
|---|---|
Use Scenario: Protecting D+/D− lines of USB 2.0 ports in laptops, tablets, and docking stations against user-handling ESD. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between connector and USB transceiver, clamping transients before they reach the PHY. Use Value: 0.9pF capacitance prevents signal distortion at 480Mbps; 6.8V clamping ensures receiver inputs remain within absolute maximum ratings during ±30kV contact discharge. |
Use Scenario: Safeguarding Ethernet PHY differential pairs in smart TVs, NVRs, and industrial gateways exposed to field ESD. IC Role / Device Role / Timing Role: Low-capacitance ESD clamp on TX/RX lines, positioned adjacent to RJ45 magnetics to minimize loop inductance. Use Value: Sub-1pF IO capacitance maintains impedance matching and eye diagram integrity; 0.13Ω RDYN suppresses voltage overshoot during 100ns TLP pulses. |
| GPIO Protection in Wearables | Pushbutton/Keypad ESD Suppression |
Use Scenario: Shielding touch-sensitive GPIOs and sensor interfaces in fitness trackers and smartwatches from finger-contact ESD. IC Role / Device Role / Timing Role: Single-channel ESD suppressor on each active-low interrupt line or I²C bus segment. Use Value: 0.1nA leakage avoids battery drain in always-on modes; compact SOD-523 footprint fits tight wearable PCB real estate. |
Use Scenario: Preventing ESD-induced reset or latch-up in mechanical pushbuttons used in EPOS terminals and kiosks. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (anode-to-GND) shunting button line to ground during discharge events. Use Value: 4.5V VBRF ensures no conduction during 3.3V logic-high states; ±30kV rating covers worst-case operator contact scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESD324DYAR | Quad-channel version in same SOD-523 package; 1.1pF typical capacitance; identical ±30kV rating and 6.8V clamping. | Designed for multi-line protection (e.g., USB D+/D− + VBUS + ID); not suitable for single-line cost-optimized designs. | Select ESD324DYAR only when protecting ≥2 signal lines on same board area to reduce component count and assembly cost. |
| TPD2E001DRLR | Bidirectional configuration; 1.0pF typical capacitance; lower 6.5V clamping at 16A TLP; same SOD-523 footprint. | Required for AC-coupled or symmetric signal lines (e.g., audio, some USB variants) where polarity reversal occurs. | Choose TPD2E001DRLR when protecting bidirectional signals or when tighter clamping margin is needed, accepting slightly higher leakage (1nA). |
Compared with ESD321DYAR, ESD324DYAR offers channel integration at minor capacitance trade-off, while TPD2E001DRLR provides polarity flexibility at the cost of higher leakage - both require layout verification but share identical thermal and solderability characteristics.
Availability
ESD321DYAR is available at Aetrix Electronics and suitable for USB 2.0 interface protection, Ethernet PHY safeguarding, and wearable GPIO hardening requiring stable component supply and long-term production continuity.
Supply support for ESD321DYAR 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 leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and power efficiency.
The ESD321DYAR belongs to TI's high-speed ESD protection portfolio, designed specifically for low-capacitance, high-threshold transient suppression in consumer, industrial, and communications interfaces.
FAQ
What is the exact package type and dimensions of ESD321DYAR?
ESD321DYAR uses the SOT-5X3 (DYA) package - a 2-pin SOD-523 variant measuring 1.6mm × 0.8mm with 0.77mm maximum height. Pin 1 is the GND terminal, and Pin 2 is the I/O terminal, arranged in flow-through configuration to minimize trace inductance. This package is MSL Level-3 compliant with Sn lead finish.
Does ESD321DYAR support bidirectional signal lines like USB D+ and D−?
ESD321DYAR is a unidirectional TVS diode configured anode-to-GND, making it ideal for protecting single-ended or DC-biased lines such as USB D+ or D− individually. For true bidirectional protection (e.g., AC-coupled lines), TI recommends TPD2E001DRLR - but ESD321DYAR remains valid for standard USB 2.0 implementations where each line is clamped separately to ground.
What is the maximum recommended operating voltage for ESD321DYAR?
The ESD321DYAR has a reverse stand-off voltage (VRWM) of 3.6V and a minimum breakdown voltage (VBRF) of 4.5V. It is rated for continuous operation with input voltages from 0V to 3.6V, making it suitable for 3.3V systems including USB 2.0, Ethernet PHYs, and GPIOs - exceeding this range risks premature conduction or reliability degradation.
How does ESD321DYAR perform under IEC 61000-4-5 surge conditions?
ESD321DYAR is rated for 6A peak current under the IEC 61000-4-5 8/20µs surge waveform. Its clamping voltage remains ≤6.3V at 6A, and its 0.13Ω dynamic resistance ensures minimal voltage overshoot. This performance is validated per TI's production test flow and supports secondary-level surge protection in conjunction with primary MOV/GDT stages.
Can ESD321DYAR be used in automotive applications?
Yes - ESD321DYAR is qualified for operation from –40°C to +125°C and meets AEC-Q200 stress test requirements for passive components. While not AEC-Q100 qualified as an integrated circuit, its robustness, low leakage (0.1nA), and IEC 61000-4-2/4/5 compliance make it suitable for non-safety-critical automotive domains such as infotainment USB ports, telematics module GPIOs, and display interface protection.
ESD321DYAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-79, SOD-523
- 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:
- 6.3V (Typ)
- Current - Peak Pulse (10/1000µs):
- 6A (8/20µs)
- Power - Peak Pulse:
- 40W
- Power Line Protection:
- No
- Applications:
- USB
- Capacitance @ Frequency:
- 0.9pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-5X3
ESD321DYAR FAQ
1.How can I place an order for ESD321DYAR through Aetrix?
Please submit a Request for Quotation (RFQ) for ESD321DYAR 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 ESD321DYAR reliable?
The price and inventory of ESD321DYAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ESD321DYAR is usually 5 days.
3.What payment methods are accepted for ESD321DYAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ESD321DYAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ESD321DYAR?
ESD321DYAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ESD321DYAR 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 ESD321DYAR?
For technical support, including ESD321DYAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ESD321DYAR requirements.
6.How does Aetrix verify that ESD321DYAR is sourced from the original manufacturer or authorized distributors?
All ESD321DYAR 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 ESD321DYAR meets industry standards.
7.What is the process for return or replacement of ESD321DYAR?
All ESD321DYAR units undergo pre-shipment inspection (PSI). If there is an issue with ESD321DYAR, 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 ESD321DYAR part is unused and in its original packaging.
Return procedure for ESD321DYAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ESD321DYAR Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
