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STMicroelectronics ESDA12-1K
- Part No.:
- ESDA12-1K
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
ESDA12-1K.pdf
- Description:
- TVS DIODE 12VWM 28VC SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:115,121
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Product details
Overview
ESDA12-1K from STMicroelectronics is a unidirectional Transil™ TVS diode designed for ESD and EOS protection of single-line data/power ports in portable electronics, featuring 12 V breakdown voltage (min), 450 W peak pulse power (8/20 µs), 16 A peak pulse current, 10 V clamping voltage at 16 A, and <0.5 µA leakage at 5 V. It is deployed in battery/charger port interfaces of smartphones and accessories to suppress transient overvoltages.
For engineers reviewing the ESDA12-1K datasheet, ESDA12-1K pinout, ESDA12-1K application, or ESDA12-1K equivalent, key selection criteria include clamping voltage under IEC 61000-4-2 contact discharge, SOD-523 footprint compatibility, junction temperature range (-40 to +150 °C), and compliance with MIL-STD-883G Class 3B HBM ≥8 kV.
Technical Context
The ESDA12-1K operates as a single-line, unidirectional avalanche diode with a defined breakdown threshold at 12 V (min) and clamps transients to ≤10 V at 16 A (8/20 µs). Its low capacitance (150 pF at 0 V) minimizes signal distortion on high-speed lines like USB or audio paths.
It meets IEC 61000-4-2 Level 4 ESD immunity (±30 kV contact, ±15 kV air) and supports robust thermal operation up to +150 °C junction temperature, validated per MIL-STD-883G Method 3015-7 Class 3B (HBM ≥8 kV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 12 V (min) - defines minimum voltage at which device enters avalanche conduction to divert transients |
| Clamping Voltage (VCL) | 10 V @ 16 A (8/20 µs) - maximum voltage seen by protected IC during worst-case surge |
| Peak Pulse Power | 450 W (8/20 µs) - energy-handling capability for short-duration EOS events |
| Leakage Current | <0.5 µA @ 5 V - ensures negligible standby power loss and signal integrity in battery-powered systems |
| Capacitance (CLINE) | 150 pF @ 0 V, 1 MHz - low enough to avoid degrading signal rise/fall times on 10–50 Mbps interfaces |
| ESD Rating | ±30 kV contact discharge (IEC 61000-4-2 Level 4) - exceeds industrial and consumer immunity requirements |
Pinout & Package
ESDA12-1K is housed in the SOD-523 surface-mount package (1.6 mm × 0.8 mm × 0.6 mm), optimized for high-density PCB layouts and reflow-compatible assembly. The package features two terminals with polarity marking (pin 1 cathode indicator) and complies with JEDEC MO-203AA and UL94 V0 flammability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode | Connected to protected line (e.g., VBUS or data line); conducts when transient exceeds VBR |
| Pin 2 | Anode | Connected to ground reference; completes current path during ESD event |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Enables asymmetric protection on DC-biased lines (e.g., USB VBUS) without reverse leakage issues |
| 1.3 mm² PCB footprint | Reduces board area by >50% vs. SOD-323, supporting miniaturized charger/battery port designs |
| Lead-free ECOPACK® packaging | Meets RoHS and REACH requirements with SnAgCu solder compatibility and 260 °C max lead temperature |
| High integration density | Single-line protection replaces discrete RC networks or larger arrays, simplifying layout and BOM |
Applications
| Smartphone Charger Port Protection | USB Battery Charging Interface |
|---|---|
Use Scenario: Protects micro-USB or USB-C VBUS line against ESD during cable insertion/removal and EOS from faulty chargers. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between VBUS and GND, clamping surges before they reach PMIC or battery fuel gauge IC. Use Value: Limits clamped voltage to ≤10 V at 16 A, preventing latch-up or gate oxide damage in 5 V-tolerant power management ICs. | Use Scenario: Shields battery charging control lines (e.g., D+/D− or dedicated charge enable) in portable devices. IC Role / Device Role / Timing Role: Single-line ESD suppressor on bidirectional signaling lines operating near 3.3 V logic levels. Use Value: 150 pF capacitance avoids signal integrity degradation on 480 Mbps USB 2.0 data lines while maintaining <0.5 µA leakage for battery runtime. |
| Wireless Headset Audio Jack | Bluetooth Accessory Battery Terminal |
Use Scenario: Guards 3.5 mm TRRS audio jack contacts against user-hand ESD during plug insertion. IC Role / Device Role / Timing Role: Low-capacitance TVS on left/right/ground/mic lines, mounted adjacent to jack connector. Use Value: 10 V clamping prevents pop-noise coupling into audio amplifiers and protects codec ESD-sensitive inputs. | Use Scenario: Protects exposed battery terminals in compact Bluetooth earbuds or wearables from accidental contact discharge. IC Role / Device Role / Timing Role: Cathode-to-terminal, anode-to-chassis-ground configuration for direct battery rail surge suppression. Use Value: Withstands ±30 kV contact discharge without parametric shift, ensuring long-term reliability in field-replaceable battery modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | DO-214AC package (4.5 mm × 2.7 mm); 12 V VBR, 400 W PPP, 33.2 V VCL @ 10.3 A | Larger footprint; higher clamping voltage limits use to non-sensitive power rails only | Select when board space allows and higher surge margin is needed over compactness |
| TPD1E05U06DPYR | 0402 DFN package; 5.5 V VBR, 120 W PPP, 12 V VCL @ 3 A, 0.6 pF CJ | Lower voltage rating and power handling; optimized for high-speed data lines, not power rails | Prefer for USB 3.0/MIPI where sub-1 pF capacitance is mandatory, not for VBUS protection |
Compared with SMAJ12A and TPD1E05U06DPYR, ESDA12-1K uniquely balances 450 W surge capability, 10 V clamping, and 1.3 mm² SOD-523 size-making it optimal for space-constrained, 5 V power-line ESD protection where both energy handling and low clamping are critical.
Availability
ESDA12-1K is available at Aetrix Electronics and suitable for smartphone charger port protection, USB battery charging interface design, wireless headset audio jack hardening, and Bluetooth accessory battery terminal safeguarding requiring stable component supply across production ramps.
Supply support for ESDA12-1K 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, power, and analog/mixed-signal solutions with broad manufacturing and R&D infrastructure.
The ESDA-1K series belongs to ST's Transil™ TVS portfolio, engineered specifically for ultra-compact, high-energy ESD/EOS protection in portable and battery-powered consumer electronics.
FAQ
What is the maximum junction temperature rating for ESDA12-1K?
The ESDA12-1K has a specified operating junction temperature range of –40 °C to +150 °C, validated per absolute maximum ratings in ST's Doc ID 17883 Rev 1. This enables reliable operation in thermally demanding environments such as enclosed smartphone chassis or wearable devices with limited airflow.
Does ESDA12-1K meet automotive qualification standards?
No-ESDA12-1K is not qualified to AEC-Q200 or other automotive-grade standards. ST explicitly states in the datasheet that non-automotive-grade parts "may only be used in automotive applications at user's own risk." It is intended for consumer portable electronics per IEC 61000-4-2 and MIL-STD-883G Class 3B.
Can ESDA12-1K be used on bidirectional signal lines like USB D+ and D–?
ESDA12-1K is unidirectional and unsuitable for true bidirectional lines without external biasing. For D+/D−, a bidirectional TVS (e.g., ESDALC6-1BM2) or dual unidirectional configuration is required. Its 12 V VBR also exceeds typical 3.3 V logic swing, risking false triggering.
What is the recommended PCB pad layout for SOD-523 mounting?
ST recommends symmetrical copper pads matching the SOD-523 footprint (1.6 mm × 0.8 mm), closed vias to control solder paste volume, and balanced track placement to prevent tombstoning. Exact dimensions are provided in Figure 10 of Doc ID 17883 Rev 1, with tolerance ±0.05 mm for placement accuracy.
ESDA12-1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- SC-79, SOD-523
- Series:
- ESDA, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 12V
- Voltage - Clamping (Max) @ Ipp:
- 28V
- Current - Peak Pulse (10/1000µs):
- 16A (8/20µs)
- Power - Peak Pulse:
- 450W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 150pF @ 1MHz
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
ESDA12-1K FAQ
1.How can I place an order for ESDA12-1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ESDA12-1K 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 ESDA12-1K reliable?
The price and inventory of ESDA12-1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ESDA12-1K is usually 5 days.
3.What payment methods are accepted for ESDA12-1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ESDA12-1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ESDA12-1K?
ESDA12-1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ESDA12-1K 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 ESDA12-1K?
For technical support, including ESDA12-1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ESDA12-1K requirements.
6.How does Aetrix verify that ESDA12-1K is sourced from the original manufacturer or authorized distributors?
All ESDA12-1K 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 ESDA12-1K meets industry standards.
7.What is the process for return or replacement of ESDA12-1K?
All ESDA12-1K units undergo pre-shipment inspection (PSI). If there is an issue with ESDA12-1K, 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 ESDA12-1K part is unused and in its original packaging.
Return procedure for ESDA12-1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ESDA12-1K Tags
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