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STMicroelectronics ESDALC20-1BF4
- Part No.:
- ESDALC20-1BF4
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- 0201 (0603 Metric)
- Datasheet:
-
ESDALC20-1BF4.pdf
- Description:
- TVS DIODE 20VWM 37VC 0201
- Quantity:
- Payment:
- Shipping:
Inventory:266,291
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Product details
Overview
ESDALC20-1BF4 from STMicroelectronics is a bidirectional single-line TVS diode for ESD protection of high-speed data lines, featuring 20 V stand-off voltage, 37 V clamping voltage at 30 ns (IEC 61000-4-2 contact discharge), 11.5 pF line capacitance, <1 nA leakage current, and 0201 package footprint of 0.18 mm² - deployed in smartphone USB/MIPI interfaces.
For engineers reviewing the ESDALC20-1BF4 datasheet, ESDALC20-1BF4 pinout, ESDALC20-1BF4 application, or ESDALC20-1BF4 equivalent, key selection criteria include ultra-low capacitance for signal integrity, ±30 kV air/±20 kV contact ESD robustness, 0201 board space constraints, and bidirectional transient clamping without polarity dependency.
Technical Context
This device implements a silicon avalanche diode structure optimized for fast response (<1 ns) to ESD transients per IEC 61000-4-2, with symmetrical bidirectional clamping enabling use on AC-coupled or differential I/O lines without orientation sensitivity. Its low dynamic impedance ensures stable clamping under 2.4 A peak pulse current (8/20 μs).
The junction capacitance remains tightly controlled at 10.5–11.5 pF (1 MHz, 0 V bias), minimizing signal distortion on high-frequency interfaces such as MIPI D-PHY and USB 2.0. Thermal operation spans –40 °C to 150 °C, supporting placement near heat-generating SoCs in compact portable designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | ±20 V - defines maximum continuous operating voltage before leakage rises; enables compatibility with 1.8 V/3.3 V I/O rails. |
| Clamping Voltage (VCL) | 37 V @ 30 ns, ±20 kV contact discharge - limits transient overvoltage seen by protected IC, preserving interface reliability. |
| Line Capacitance (CLINE) | 11.5 pF @ 1 MHz - maintains signal integrity on >480 Mbps USB 2.0 or 1.5 Gbps MIPI D-PHY links without measurable eye degradation. |
| Leakage Current (IRM) | <1 nA @ ±20 V - avoids DC loading on high-impedance sensor or reference lines; critical for battery-powered always-on functions. |
| ESD Robustness | ±30 kV air / ±20 kV contact (IEC 61000-4-2 Level 4) - exceeds industrial immunity requirements for handheld consumer electronics. |
| Package Size | 0201 (ST0201), 0.60 × 0.30 × 0.30 mm - occupies only 0.18 mm² PCB area, enabling placement directly at connector or SoC pad. |
Pinout & Package
ESDALC20-1BF4 uses the ST0201 0201 surface-mount package: two-terminal, symmetric, non-polarized device. No orientation marking required; terminals are electrically identical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no fixed polarity assignment. |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; device functions identically regardless of mounting orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low line capacitance | 11.5 pF enables direct placement on 480 Mbps USB 2.0 and MIPI D-PHY lanes without equalization or layout compensation. |
| Bidirectional clamping symmetry | Identical VBR (22–23 V) and VCL performance for +ESD and –ESD events eliminates need for polarity-aware routing or silkscreen orientation marks. |
| Sub-1 nA leakage | Ensures negligible current draw on always-on I²C/SPI control lines or analog sensor inputs, extending battery life in portable devices. |
| 0201 footprint efficiency | 0.18 mm² area reduces PCB real estate by >50% vs. 0402 ESD diodes, critical for narrow bezel smartphone front-end layouts. |
Applications
| Smartphone USB Interface Protection | Tablet MIPI D-PHY Lane Protection |
|---|---|
Use Scenario: Protecting USB 2.0 D+/D− lines between Type-C connector and application processor against user-handling ESD. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed within 3 mm of connector, clamping sub-1 ns ESD spikes before reaching PHY transceiver. Use Value: Prevents latch-up or gate oxide damage in USB PHY while maintaining <12 pF total path capacitance for full-speed signaling compliance. | Use Scenario: Shielding MIPI D-PHY clock and data lanes in tablet display subsystem from ESD during flex-cable mating/unmating. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted adjacent to display driver IC pads to suppress ±20 kV contact discharges without degrading 1.5 Gbps eye diagram. Use Value: Enables pass/fail ESD testing per IEC 61000-4-2 Level 4 without signal integrity loss or link training failure. |
| Digital Camera Sensor Interface | Wireless Headset Audio Codec I/O |
Use Scenario: Safeguarding high-resolution image sensor parallel data bus (e.g., 10-bit LVCMOS) from lens-mount ESD events. IC Role / Device Role / Timing Role: Single-line ESD clamp per data bit, placed at sensor module edge to minimize trace inductance and clamping delay. Use Value: Maintains <11.5 pF load per line, preventing timing skew across parallel bus and preserving pixel clock setup/hold margins. | Use Scenario: Protecting stereo audio codec I²S/PCM data and clock lines in Bluetooth headset PCBs exposed to pocket discharge. IC Role / Device Role / Timing Role: Bidirectional TVS on each I²S line (BCLK, WS, SDATA), located at codec die pad to limit transient overshoot to <37 V. Use Value: Eliminates audible pop/click artifacts caused by ESD-induced digital noise coupling into audio DAC path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD1E01B04DPYR (TI) | 10 pF capacitance, 30 V clamping, same 0201 package | Slightly lower clamping but higher leakage (5 nA typ.) | Preferred where lowest possible capacitance is prioritized over leakage-sensitive bias networks. |
| UMK105CG101KV-F (Taiyo Yuden) | MLCC-based ESD suppression; 100 pF, no defined clamping voltage | Acts as low-pass filter rather than active clamping; limited to low-speed lines | Only suitable for non-high-speed control lines (e.g., reset, interrupt) where bandwidth is not constrained. |
Compared with TPD1E01B04DPYR, ESDALC20-1BF4 offers lower leakage for always-on sensor interfaces; versus UMK105CG101KV-F, it delivers deterministic clamping and ESD immunity certification - making it the sole choice for certified high-speed data line protection.
Availability
ESDALC20-1BF4 is available at Aetrix Electronics and suitable for smartphone interface protection, tablet display subsystems, digital camera sensor buses, and wireless audio codec I/O requiring stable component supply and full IEC 61000-4-2 Level 4 compliance.
Supply support for ESDALC20-1BF4 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 microcontrollers, power ICs, sensors, and discrete protection devices for automotive, industrial, and consumer markets.
ESDALC20-1BF4 belongs to ST's ESDALC ultra-low-capacitance TVS family, engineered specifically for high-speed digital interface protection where board space, signal fidelity, and certified ESD immunity are jointly constrained.
FAQ
What is the maximum allowable PCB trace length between ESDALC20-1BF4 and the protected I/O pin?
Trace length must be ≤3 mm from device terminal to IC pad to maintain sub-nanosecond response and prevent inductive voltage overshoot. Longer traces increase loop inductance, raising clamped voltage beyond 37 V and risking PHY damage. Layout guidelines in DS11117 Section 3.5 mandate symmetric, short, direct routing with no vias in the protection path.
Does ESDALC20-1BF4 require external biasing or series resistance?
No. ESDALC20-1BF4 operates passively with no external components. It requires no bias voltage, pull-up/down resistors, or series current-limiting elements. Its bidirectional avalanche structure conducts only during transients above VRM, drawing zero steady-state current below 20 V.
Can ESDALC20-1BF4 be used on 5 V logic interfaces?
No. With a 20 V stand-off voltage and 22–23 V breakdown, ESDALC20-1BF4 is unsuitable for 5 V systems - it would conduct continuously and fail. For 5 V interfaces, ST recommends ESDALC6-1BF4 (6 V VRM) or ESDALC12-1BF4 (12 V VRM), both in identical 0201 packaging.
Is the 0201 package compatible with standard SMT reflow profiles?
Yes. ESDALC20-1BF4 is qualified for IPC/JEDEC J-STD-020 reflow, with peak temperature up to 245 °C and 60–90 s above 217 °C. ST's recommended profile (DS11117 Figure 14) specifies ramp rates ≤3 °C/s and controlled cooling to avoid thermal shock cracking in the silicon junction.
ESDALC20-1BF4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 0201 (0603 Metric)
- Series:
- ESDA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22V
- Voltage - Clamping (Max) @ Ipp:
- 37V
- Current - Peak Pulse (10/1000µs):
- 2.4A (8/20µs)
- Power - Peak Pulse:
- 90W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 10.5pF @ 1MHz
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 0201
ESDALC20-1BF4 FAQ
1.How can I place an order for ESDALC20-1BF4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ESDALC20-1BF4 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 ESDALC20-1BF4 reliable?
The price and inventory of ESDALC20-1BF4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ESDALC20-1BF4 is usually 5 days.
3.What payment methods are accepted for ESDALC20-1BF4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ESDALC20-1BF4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ESDALC20-1BF4?
ESDALC20-1BF4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ESDALC20-1BF4 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 ESDALC20-1BF4?
For technical support, including ESDALC20-1BF4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ESDALC20-1BF4 requirements.
6.How does Aetrix verify that ESDALC20-1BF4 is sourced from the original manufacturer or authorized distributors?
All ESDALC20-1BF4 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 ESDALC20-1BF4 meets industry standards.
7.What is the process for return or replacement of ESDALC20-1BF4?
All ESDALC20-1BF4 units undergo pre-shipment inspection (PSI). If there is an issue with ESDALC20-1BF4, 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 ESDALC20-1BF4 part is unused and in its original packaging.
Return procedure for ESDALC20-1BF4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ESDALC20-1BF4 Tags
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