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STMicroelectronics ESDA18-1K
- Part No.:
- ESDA18-1K
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
ESDA18-1K.pdf
- Description:
- TVS DIODE 15VWM 34VC SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:115,170
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Product details
Overview
ESDA18-1K from STMicroelectronics is a unidirectional Transil™ TVS diode for ESD and EOS protection of single-line I/O ports in portable electronics, featuring 18 V breakdown voltage (min), 400 W peak pulse power (8/20 µs), 24 V clamping voltage at 12 A, <0.5 µA leakage at 5 V, and SOD-523 package. It is deployed in battery/charger port interfaces of smartphones and accessories to suppress contact ESD up to 30 kV.
For engineers reviewing the ESDA18-1K datasheet, ESDA18-1K pinout, ESDA18-1K application, or ESDA18-1K equivalent, key selection criteria include clamping voltage under 12 A surge, low capacitance (105 pF), thermal robustness to +150 °C junction temperature, and compliance with IEC 61000-4-2 Level 4 (±30 kV contact).
Technical Context
The ESDA18-1K operates as a single-line transient voltage suppression diode with avalanche breakdown behavior, triggered above 18 V to clamp transients while maintaining sub-µA leakage below operating voltage. Its unidirectional architecture provides asymmetrical protection-forward conduction only during negative surges relative to cathode reference.
Designed for high-density PCB layout, it delivers 400 W peak pulse power handling per IEC 61000-4-2 8/20 µs waveform and maintains stable clamping performance across -40 °C to +150 °C junction temperature range, validated by typical curves for VCL vs. IPP and PPP vs. Tj.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 18 V min @ 1 mA - ensures reliable turn-on above normal 5–12 V I/O rail voltages without false triggering |
| Clamping Voltage (VCL) | 24 V max @ 12 A (8/20 µs) - limits downstream IC stress to safe levels during 30 kV ESD events |
| Peak Pulse Power (PPP) | 400 W @ 8/20 µs - sustains high-energy EOS transients common in charger insertion/removal |
| Leakage Current (IR) | <0.5 µA @ 5 V - avoids signal integrity degradation or battery drain in always-on mobile ports |
| Capacitance (CLINE) | 105 pF @ 0 V, 1 MHz - balances ESD robustness with minimal loading on high-speed USB/charger detection lines |
| ESD Withstand (IEC 61000-4-2) | 30 kV contact discharge - exceeds Level 4 requirement, enabling single-device compliance without external filtering |
Pinout & Package
SOD-523 surface-mount package: 1.3 mm² footprint, 0.6 mm height, lead-free, UL94 V0 epoxy, compatible with standard reflow profiles (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to protected line (e.g., VBUS or D+); current flows into device during negative transients |
| Pin 2 | Cathode | Connected to ground reference; defines polarity and establishes clamping threshold relative to GND |
Key Features
| Feature | Design Value |
|---|---|
| High-Energy Transient Suppression | 400 W peak pulse power enables robust protection against both ESD (IEC 61000-4-2) and EOS (charger hot-swap) events |
| Low-Leakage Protection | <0.5 µA leakage at 5 V preserves battery life and prevents false logic states in always-connected ports |
| Miniaturized Footprint | 1.3 mm² SOD-523 area supports ultra-thin smartphone designs where board space is constrained near connectors |
| Thermal Stability | Rated for continuous operation from –40 °C to +150 °C junction temperature, ensuring reliability in sealed battery compartments |
Applications
| Smartphone Charger Port Protection | USB-C Accessory Interface |
|---|---|
Use Scenario: ESD events during repeated plugging/unplugging of USB cables into handheld devices. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping VBUS line to ground during ±30 kV contact discharge. Use Value: Prevents latch-up or gate oxide damage in PMIC and USB controller ICs without adding series resistance or delay. | Use Scenario: Transient coupling from adjacent high-current paths in compact accessory PCBs (e.g., wireless charging adapters). IC Role / Device Role / Timing Role: Single-line transient suppressor on CC or VCONN lines, referenced to system ground. Use Value: Maintains signal integrity on 300 kHz USB PD communication while suppressing 15 kV air discharge per IEC 61000-4-2. |
| Bluetooth Headset Battery Terminal | Portable Medical Sensor Charging Port |
Use Scenario: Electrostatic discharge during battery replacement or cable connection in wearables. IC Role / Device Role / Timing Role: Low-capacitance (105 pF) TVS on Li-ion charge path to protect fuel gauge and protection IC. Use Value: Limits clamping voltage to 24 V at 12 A, preventing overvoltage stress on 16 V-rated battery management circuits. | Use Scenario: ESD exposure in clinical environments where staff handle charging docks for patient-worn sensors. IC Role / Device Role / Timing Role: Primary ESD barrier on micro-USB input, placed immediately after connector to shunt energy before LDO input. Use Value: Achieves full IEC 61000-4-2 Level 4 compliance with no additional RC filtering, reducing BOM count and layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESDA12-1K | 12 V breakdown (min), 450 W PPP, 16.5 V VCL @ 16 A, 150 pF CLINE | Better suited for 5 V systems requiring lower clamping; higher capacitance may affect high-speed lines | Select when protecting 3.3–5 V rails where tighter voltage margin is critical and bandwidth is not constrained. |
| SMAJ18A | 18 V standoff, 400 W PPP, but SMA package (4.5 mm²), 27.7 V VCL @ 12.3 A, 250 pF | Larger footprint and higher clamping reduce suitability for space-constrained portable designs | Choose only if SOD-523 assembly capability is unavailable and board area permits SMA-level packaging. |
Compared with ESDA12-1K, ESDA18-1K trades lower clamping for higher voltage margin in 12 V systems; versus SMAJ18A, it delivers identical power rating in 71% less PCB area and 58% lower capacitance-critical for miniaturized USB and battery interface protection.
Availability
ESDA18-1K is available at Aetrix Electronics and suitable for smartphone charger port protection, USB-C accessory interface hardening, and portable medical sensor charging port ESD mitigation requiring stable component supply and long-term lifecycle support.
Supply support for ESDA18-1K 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, designing and manufacturing analog, MCU, power, and protection devices for automotive, industrial, and consumer markets.
The Transil™ TVS diode product line targets ESD/EOS-sensitive interfaces in portable and battery-powered equipment, emphasizing miniaturization, low leakage, and certified immunity to international electrostatic discharge standards.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The ESDA18-1K is rated for continuous operation from –40 °C to +150 °C junction temperature, as specified in Table 1 of Doc ID 17883 Rev 1. This allows deployment in thermally confined spaces such as sealed smartphone battery compartments or enclosed medical sensor housings without derating.
Does ESDA18-1K meet automotive qualification standards?
No-ESDA18-1K is not qualified to AEC-Q200 or any automotive-grade standard. ST explicitly states in the datasheet that non-automotive-grade products are intended for consumer and industrial use only, and cautions against use in safety-critical or automotive applications unless independently validated by the user.
Can ESDA18-1K be used on bidirectional data lines like USB D+/D–?
No-it is a unidirectional device optimized for power or single-ended signal lines (e.g., VBUS, battery sense). For bidirectional data lines, ST recommends dual-channel or bidirectional arrays such as ESDALYV5-1BU2, which provide symmetrical clamping without DC bias dependency.
What is the recommended PCB pad layout for SOD-523 assembly?
Per ST's recommendation in Section 4.3, use closed vias (not open) within solder pads to control paste volume, maintain symmetrical copper distribution around both terminals, and avoid tilt during reflow. The exact footprint dimensions are provided in Figure 10: 0.7 mm pad length, 0.3 mm pad width, 0.7 mm center-to-center spacing.
ESDA18-1K 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):
- 15V
- Voltage - Breakdown (Min):
- 18V
- Voltage - Clamping (Max) @ Ipp:
- 34V
- Current - Peak Pulse (10/1000µs):
- 12A (8/20µs)
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 105pF @ 1MHz
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
ESDA18-1K FAQ
1.How can I place an order for ESDA18-1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ESDA18-1K 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 ESDA18-1K reliable?
The price and inventory of ESDA18-1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ESDA18-1K is usually 5 days.
3.What payment methods are accepted for ESDA18-1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ESDA18-1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ESDA18-1K?
ESDA18-1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ESDA18-1K 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 ESDA18-1K?
For technical support, including ESDA18-1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ESDA18-1K requirements.
6.How does Aetrix verify that ESDA18-1K is sourced from the original manufacturer or authorized distributors?
All ESDA18-1K 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 ESDA18-1K meets industry standards.
7.What is the process for return or replacement of ESDA18-1K?
All ESDA18-1K units undergo pre-shipment inspection (PSI). If there is an issue with ESDA18-1K, 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 ESDA18-1K part is unused and in its original packaging.
Return procedure for ESDA18-1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ESDA18-1K Tags
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