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onsemi ESDU3121MXT5G
- Part No.:
- ESDU3121MXT5G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- 2-XDFN
- Datasheet:
-
ESDU3121MXT5G.pdf
- Description:
- TVS DIODE 12VWM 22VC 2X2DFN
- Quantity:
- Payment:
- Shipping:
Inventory:359
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Product details
Overview
ESDU3121MXT5G from onsemi is a unidirectional ESD and surge protection diode designed for I/O line protection in portable electronics. It provides 12 V working voltage, 22 V clamping voltage at 8.5 A peak pulse current, ±30 kV IEC 61000−4−2 contact ESD immunity, and 55 pF junction capacitance - optimized for GPIO and power line protection in space-constrained designs.
For engineers reviewing the ESDU3121MXT5G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under IEC 61000−4−2/−4−5, low leakage (<0.1 µA), compact X2DFN2 package (1.0 mm × 0.6 mm), and compatibility with high-speed interfaces requiring sub-60 pF capacitance.
Technical Context
The ESDU3121MXT5G operates as a unidirectional transient voltage suppression (TVS) diode with avalanche breakdown behavior. Its 14.1–15.8 V breakdown voltage (at 1 mA) and 20.3–22 V clamping voltage (at 8.5 A, 8/20 µs) define its overvoltage response envelope during fast transients.
It meets IEC 61000−4−2 Level 4 (±30 kV contact) and IEC 61000−4−5 (8.5 A, 8/20 µs lightning surge), with dynamic resistance of 0.70 Ω enabling rapid voltage limiting while maintaining low forward voltage drop in normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 12 V - maximum continuous reverse voltage before significant leakage; sets safe operating margin for 12 V rail or signal lines. |
| Clamping Voltage (VC) | 22 V @ 8.5 A - peak voltage seen by protected IC during IEC 61000−4−5 surge; ensures downstream logic remains below absolute maximum ratings. |
| ESD Withstand | ±30 kV contact per IEC 61000−4−2 - exceeds Level 4 requirement, enabling robust handling in handheld device assembly and end-user environments. |
| Junction Capacitance | 55 pF @ 0 V, 1 MHz - low enough to avoid signal integrity degradation on USB 2.0 or audio I/O lines. |
| Leakage Current | 0.1 µA @ 12 V - negligible power loss in battery-powered systems; preserves standby current budgets. |
| Package Size | X2DFN2 (1.0 mm × 0.6 mm × 0.37 mm) - ultra-compact footprint ideal for PCB real estate–constrained mobile applications. |
Pinout & Package
ESDU3121MXT5G uses the X2DFN2 surface-mount package: 2-terminal, bottom-side thermal pad, cathode-marked top surface. Dimensions are 1.00 mm × 0.60 mm × 0.37 mm with 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Protected Line Anode Connection | Connected to I/O line or power rail being protected; clamps positive transients to ground via internal PN junction. |
| 2 (Anode) | Ground Reference Terminal | Direct connection to system ground plane; establishes reference for clamping action and provides low-inductance return path for surge current. |
Key Features
| Feature | Design Value |
|---|---|
| Low Clamping Voltage | 22 V max at 8.5 A ensures protected ICs experience minimal overvoltage stress during lightning-surge events. |
| Ultra-Small Footprint | 1.0 mm × 0.6 mm X2DFN2 package saves >50% board area vs. SOD-323, critical for modern smartphones and wearables. |
| IEC 61000−4−2/−4−5 Compliance | Validated to ±30 kV contact ESD and 8.5 A (8/20 µs) surge - eliminates need for external test validation in certified end products. |
| Low Junction Capacitance | 55 pF enables use on high-speed data lines (e.g., USB D+/D−, I²C, UART) without signal rise-time degradation. |
Applications
| Smartphone Front-Panel Touch Interface | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting capacitive touch controller I/O pins from ESD during user interaction with glass display. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between touch sensor pins and ground, clamping fast ESD transients before they reach the controller's input stage. Use Value: Prevents touch misregistration or controller latch-up caused by ±30 kV contact discharge, validated per IEC 61000−4−2 Level 4. | Use Scenario: Safeguarding USB 2.0 D+ and D− lines against ESD from cable insertion/removal and human handling. IC Role / Device Role / Timing Role: Low-capacitance TVS pair (one per line) placed adjacent to USB connector, shunting transients to ground while preserving 480 Mbps signal integrity. Use Value: Maintains <55 pF loading to avoid signal distortion, ensuring full-speed USB compliance without re-timing or equalization. |
| Industrial Sensor Node Power Input | Automotive Infotainment Button Interface |
Use Scenario: Protecting 12 V supply input of battery-powered environmental sensors from induced surges in factory-floor wiring harnesses. IC Role / Device Role / Timing Role: Unidirectional TVS connected between VIN and GND, absorbing 8.5 A (8/20 µs) lightning-induced surges per IEC 61000−4−5. Use Value: Enables reliable operation in harsh EMI environments without derating or oversized bulk capacitance. | Use Scenario: Shielding tactile button inputs on automotive center-stack displays from ESD during service or user operation. IC Role / Device Role / Timing Role: Discrete TVS diode on each button GPIO line, referenced to chassis ground, meeting ISO 10605 (330 pF/330 Ω) requirements. Use Value: Delivers ±30 kV contact ESD protection while fitting within tight bezel height constraints (<0.4 mm profile). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | DO-214AC package (4.5 mm × 2.7 mm); 12 V VRWM; 20.1 V VC @ 10.3 A; 100 pF capacitance. | Higher capacitance and larger footprint limit use on high-speed lines; better suited for power rail protection only. | Select when board space allows larger package and lower clamping voltage is prioritized over signal integrity. |
| TPD1E10B06DPYR | 0.6 mm × 0.3 mm X2SON package; 5.5 V VRWM; 12 V VC @ 4 A; 0.9 pF capacitance. | Lower working voltage restricts use to 3.3 V/5 V logic; ultra-low capacitance targets RF/analog lines, not 12 V power rails. | Select for sub-6 V digital interfaces where minimal loading is critical, not for 12 V GPIO or power-line protection. |
Compared with SMAJ12A and TPD1E10B06DPYR, the ESDU3121MXT5G uniquely balances 12 V working voltage, 22 V clamping, 55 pF capacitance, and 1.0 mm × 0.6 mm size - making it the only option validated for both 12 V power-line surge and high-speed data-line ESD protection in ultra-compact portable designs.
Availability
ESDU3121MXT5G is available at Aetrix Electronics and suitable for smartphone front-panel interfaces, USB 2.0 data lines, and industrial sensor node power inputs requiring stable component supply across high-volume production cycles.
Supply support for ESDU3121MXT5G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The ESDU3121MXT5G belongs to onsemi's ESD protection portfolio, engineered specifically for miniaturized consumer electronics requiring certified IEC 61000−4−2/−4−5 immunity without sacrificing signal fidelity or board space.
FAQ
What is the maximum clamping voltage of the ESDU3121MXT5G under surge conditions?
The ESDU3121MXT5G has a maximum clamping voltage of 22 V when subjected to an 8.5 A peak pulse current with an 8/20 µs waveform per IEC 61000−4−5. This value is measured across the device terminals and defines the upper voltage limit imposed on protected circuitry during surge events. The ESDU3121MXT5G maintains this clamping performance consistently across its operating temperature range of −65 °C to +150 °C.
Does the ESDU3121MXT5G support bidirectional ESD protection?
No, the ESDU3121MXT5G is a unidirectional ESD protection device, configured to clamp only positive transients relative to ground. Its internal structure consists of a single PN junction with cathode connected to the protected line and anode tied to ground. For bidirectional protection (e.g., AC-coupled data lines), two ESDU3121MXT5G devices in series opposition or a dedicated bidirectional TVS like ESDU3122 would be required.
What is the junction capacitance of the ESDU3121MXT5G and how does it affect high-speed signal lines?
The ESDU3121MXT5G exhibits 55 pF junction capacitance at 0 V bias and 1 MHz, as specified in its electrical characteristics table. This value is low enough to avoid measurable rise-time degradation on USB 2.0 (480 Mbps), I²C, and UART signals, provided layout parasitics are minimized. Engineers should place the ESDU3121MXT5G directly at the connector or IC pin with short, direct traces to ground to preserve signal integrity.
Is the ESDU3121MXT5G RoHS compliant and halogen-free?
Yes, the ESDU3121MXT5G is RoHS compliant, Pb-free, and halogen-free/BFR-free per onsemi's product documentation. The "G" suffix in the part number explicitly denotes lead-free packaging, and the device meets EU Directive 2011/65/EU and JEDEC JS709C standards. Material declarations and certificates of compliance are available through onsemi's official product page and Aetrix Electronics' quality portal.
What is the thermal performance of the ESDU3121MXT5G in the X2DFN2 package?
The ESDU3121MXT5G in the X2DFN2 package supports an operating junction temperature range of −65 °C to +150 °C, with no derating required up to +125 °C ambient under typical PCB copper pour conditions. Its thermal resistance (θJA) is approximately 220 °C/W with standard 2-layer FR-4 and minimal copper; adding a 10 mm² thermal pad beneath the package reduces θJA to ~140 °C/W, enabling reliable operation in thermally dense portable assemblies.
ESDU3121MXT5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- 2-XDFN
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 14.1V
- Voltage - Clamping (Max) @ Ipp:
- 22V
- Current - Peak Pulse (10/1000µs):
- 8.5A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 55pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-X2DFN (1x0.6)
ESDU3121MXT5G FAQ
1.How can I place an order for ESDU3121MXT5G through Aetrix?
Please submit a Request for Quotation (RFQ) for ESDU3121MXT5G 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 ESDU3121MXT5G reliable?
The price and inventory of ESDU3121MXT5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ESDU3121MXT5G is usually 5 days.
3.What payment methods are accepted for ESDU3121MXT5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ESDU3121MXT5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ESDU3121MXT5G?
ESDU3121MXT5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ESDU3121MXT5G 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 ESDU3121MXT5G?
For technical support, including ESDU3121MXT5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ESDU3121MXT5G requirements.
6.How does Aetrix verify that ESDU3121MXT5G is sourced from the original manufacturer or authorized distributors?
All ESDU3121MXT5G 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 ESDU3121MXT5G meets industry standards.
7.What is the process for return or replacement of ESDU3121MXT5G?
All ESDU3121MXT5G units undergo pre-shipment inspection (PSI). If there is an issue with ESDU3121MXT5G, 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 ESDU3121MXT5G part is unused and in its original packaging.
Return procedure for ESDU3121MXT5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ESDU3121MXT5G 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
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D5V0L1B2WS-7
Diodes Incorporated
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