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Texas Instruments ESD851DYFR
- Part No.:
- ESD851DYFR
- Manufacturer:
- Texas Instruments
- Category:
- TVS Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
ESD851DYFR.pdf
- Description:
- BIDIRECTIONAL 36V ESD PROTECTION
- Quantity:
- Payment:
- Shipping:
Inventory:2,535
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Product details
Overview
ESD851DYFR from Texas Instruments is a bidirectional ESD protection diode in SOD-323 package, rated for ±30kV IEC 61000-4-2 contact/air-gap discharge, 6.5A IEC 61000-4-5 surge current, and 4.3pF typical IO capacitance. It provides system-level transient suppression for high-speed data lines in medical, lighting, and test equipment.
For engineers reviewing the ESD851DYFR datasheet, ESD851DYFR pinout, ESD851DYFR application, or ESD851DYFR equivalent, key selection criteria include clamping voltage (71V at 6.5A), DC breakdown voltage (min 37.8V), ultra-low leakage (≤10nA), industrial temperature range (–55°C to +150°C), and SOD-323 footprint compatibility.
Technical Context
The ESD851DYFR operates as a bidirectional TVS diode with symmetrical clamping behavior across both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its low dynamic resistance (0.6Ω) ensures minimal voltage overshoot during fast transients.
Designed for parallel connection across protected I/O lines, it conducts only during overvoltage events - maintaining <10nA leakage at 36V reverse bias and delivering 56V TLP clamping at 16A. Thermal performance is characterized by RθJA = 686.1°C/W in SOD-323 packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Rating (IEC 61000-4-2) | ±30kV contact & air-gap discharge - exceeds Level 4 compliance for robust system-level ESD immunity |
| Surge Rating (IEC 61000-4-5) | 6.5A (8/20µs) peak pulse current - sustains high-energy surges without failure |
| Clamping Voltage | 71V at 6.5A (8/20µs); 56V at 16A TLP - limits downstream IC stress during transient events |
| IO Capacitance | 4.3pF typical at 1MHz - preserves signal integrity on USB, HDMI, and other high-speed interfaces |
| DC Breakdown Voltage | 37.8V minimum - ensures reliable operation up to 36V working voltage with safety margin |
| Leakage Current | ≤10nA at 36V reverse bias - prevents power loss and signal distortion in low-power systems |
| Operating Temperature | –55°C to +150°C - supports deployment in automotive under-hood, industrial, and medical environments |
Pinout & Package
ESD851DYFR uses the industry-standard SOD-323 (DYF) leaded package (2.65mm × 1.3mm, max height 1.0mm), optimized for automated assembly and thermal reliability in space-constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IO (I/O Channel) | Protected signal line terminal; connects to upstream data/power line when Pin 2 is grounded |
| 2 | IO (I/O Channel) | Protected signal line terminal; connects to ground reference when Pin 1 is connected to protected line |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Clamping | Enables single-device protection of AC-coupled or differential signals without polarity sensitivity |
| Low Dynamic Resistance | 0.6Ω - minimizes clamping voltage rise under high-current transients for tighter protection margins |
| Ultra-Low Capacitance | 4.3pF typical - avoids signal degradation on >100Mbps data lines including USB 2.0 and LVDS |
| High-Temperature Operation | Rated to +150°C ambient - suitable for sealed enclosures and thermally demanding industrial modules |
| SOD-323 Footprint | Standardized 2-pin leaded package - enables drop-in replacement and compatibility with existing reflow profiles |
Applications
| Medical Patient Monitoring | Industrial Lighting Control |
|---|---|
Use Scenario: Protecting analog sensor inputs and digital communication lines (e.g., UART, I²C) in portable ECG and pulse oximeter devices exposed to clinical ESD events. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed directly at connector entry point to shunt ESD energy before reaching precision analog front-end or microcontroller I/O. Use Value: Maintains signal fidelity with 4.3pF capacitance while surviving ±30kV contact discharge - critical for FDA-compliant device reliability. |
Use Scenario: Safeguarding DALI and 0–10V dimming control lines in LED drivers subjected to field-installation ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on low-voltage control bus, clamping spikes to ≤71V to prevent MCU reset or DAC latch-up. Use Value: 6.5A surge rating and –55°C to +150°C operation ensure robustness in outdoor-rated luminaires with wide ambient swings. |
| Test & Measurement Equipment | Home Appliance UI Interfaces |
Use Scenario: Shielding high-impedance probe inputs and GPIB/USB-B connectors in oscilloscopes and multimeters from benchtop ESD and cable-borne noise. IC Role / Device Role / Timing Role: Low-leakage (≤10nA) ESD clamp on sensitive analog input paths, preserving measurement accuracy and offset stability. Use Value: Sub-10nA leakage avoids DC error injection; 56V TLP clamping protects 12-bit ADC references during 16A transient events. |
Use Scenario: Securing touch-button and display interface lines (e.g., SPI, I²C) in smart refrigerators and washing machines against user-hand ESD and power-line coupling. IC Role / Device Role / Timing Role: Compact SOD-323 protector mounted adjacent to membrane switch flex cables and LCD ribbon connectors. Use Value: 2.65mm × 1.3mm footprint fits tight board areas; bidirectional symmetry eliminates orientation errors during automated placement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESD851-Q1 | Automotive-grade variant qualified to AEC-Q100 Grade 1 (–40°C to +125°C); identical electrical specs and SOD-323 package | Required for automotive infotainment and body control modules; not necessary for industrial or consumer use | Select ESD851-Q1 only if automotive qualification and extended temperature validation are mandated by end-equipment standards |
| SMAJ36A | Unidirectional 36V TVS; higher clamping voltage (93V at 6.5A); larger SMA package (4.5mm × 2.7mm) | Suitable for DC power rail protection only; cannot protect AC/differential signals without additional circuitry | Choose SMAJ36A only for cost-sensitive, non-high-speed DC supply lines where size and bidirectionality are secondary concerns |
Compared with ESD851-Q1, the ESD851DYFR offers identical protection performance at lower cost and without automotive qualification overhead; versus SMAJ36A, it delivers superior high-speed signal integrity, smaller footprint, and true bidirectional capability - making it optimal for compact, mixed-signal I/O protection.
Availability
ESD851DYFR is available at Aetrix Electronics and suitable for medical patient monitoring, industrial lighting control, test & measurement equipment, and home appliance UI interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for ESD851DYFR 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 ESD851DYFR belongs to TI's ESD protection diode product line, engineered specifically for high-fidelity transient suppression on high-speed data lines while maintaining ultra-low capacitance and leakage in miniature leaded packages.
FAQ
What is the maximum operating voltage supported by the ESD851DYFR?
The ESD851DYFR has a reverse stand-off voltage (VRWM) of 36V and a minimum DC breakdown voltage (VBR) of 37.8V. This means it reliably blocks up to 36V in normal operation while triggering above ~37.8V to clamp transients - making it suitable for 3.3V, 5V, 12V, and 24V signal/power rails with appropriate design margin. The ESD851DYFR maintains this rating across its full –55°C to +150°C operating range.
Does the ESD851DYFR require orientation during PCB placement?
No - the ESD851DYFR is a fully bidirectional device with symmetrical pin functions: Pin 1 and Pin 2 are electrically identical I/O terminals. Either pin can be connected to the protected line while the other connects to ground, eliminating orientation dependency during automated assembly. This simplifies layout and reduces manufacturing errors compared to unidirectional TVS diodes like SMAJ36A.
How does the ESD851DYFR compare to polymer-based ESD suppressors?
Unlike polymer-based suppressors, the ESD851DYFR is a silicon avalanche diode offering precise, repeatable clamping voltage (56V TLP, 71V 8/20µs), sub-nanosecond response time, and stable performance over temperature and lifetime. Polymer devices exhibit higher dynamic resistance and variable clamping, whereas the ESD851DYFR delivers consistent 0.6Ω dynamic resistance and guaranteed ±30kV ESD immunity per IEC 61000-4-2.
Can the ESD851DYFR protect USB 2.0 data lines?
Yes - the ESD851DYFR's 4.3pF typical capacitance, bidirectional operation, and low clamping voltage make it suitable for USB 2.0 D+ and D– lines. Its capacitance introduces negligible signal distortion at 480Mbps, and its ±30kV ESD rating exceeds USB-IF compliance requirements. For optimal performance, place the ESD851DYFR within 2mm of the USB connector with short, symmetric traces to preserve differential impedance.
What is the moisture sensitivity level (MSL) rating for ESD851DYFR?
The ESD851DYFR carries an MSL Level-3 rating per JEDEC J-STD-020, with a peak reflow temperature of 260°C and floor life of 168 hours at ≤30°C/60% RH. This allows standard SMT assembly using lead-free reflow profiles without baking requirements for most production environments - simplifying logistics and reducing handling risk compared to higher-MSL alternatives.
ESD851DYFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-76, SOD-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 36V (Max)
- Voltage - Breakdown (Min):
- 37.8V
- Voltage - Clamping (Max) @ Ipp:
- 71V
- Current - Peak Pulse (10/1000µs):
- 6.5A (8/20µs)
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 4.3pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
ESD851DYFR FAQ
1.How can I place an order for ESD851DYFR through Aetrix?
Please submit a Request for Quotation (RFQ) for ESD851DYFR 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 ESD851DYFR reliable?
The price and inventory of ESD851DYFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ESD851DYFR is usually 5 days.
3.What payment methods are accepted for ESD851DYFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ESD851DYFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ESD851DYFR?
ESD851DYFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ESD851DYFR 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 ESD851DYFR?
For technical support, including ESD851DYFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ESD851DYFR requirements.
6.How does Aetrix verify that ESD851DYFR is sourced from the original manufacturer or authorized distributors?
All ESD851DYFR 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 ESD851DYFR meets industry standards.
7.What is the process for return or replacement of ESD851DYFR?
All ESD851DYFR units undergo pre-shipment inspection (PSI). If there is an issue with ESD851DYFR, 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 ESD851DYFR part is unused and in its original packaging.
Return procedure for ESD851DYFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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