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Diodes Incorporated DESD18VF1BL-7B
- Part No.:
- DESD18VF1BL-7B
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- 0402 (1006 Metric)
- Datasheet:
-
DESD18VF1BL-7B.pdf
- Description:
- DATALINE PROTECTION PP X1-DFN100
- Quantity:
- Payment:
- Shipping:
Inventory:2,624
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Product details
Overview
DESD18VF1BL-7B from Diodes Incorporated is a bidirectional TVS diode designed for ultra-low-capacitance ESD protection of high-speed data lines in portable electronics. It features a 19V minimum breakdown voltage, 0.3pF typical junction capacitance, ±14kV contact/±15kV air IEC 61000-4-2 ESD rating, and is housed in an X1-DFN1006-2 package (1.08mm × 0.68mm). It protects USB 2.0, HDMI, and audio interfaces in smartphones and digital cameras.
For engineers reviewing the DESD18VF1BL-7B datasheet, DESD18VF1BL-7B pinout, DESD18VF1BL-7B application, or DESD18VF1BL-7B equivalent, key selection criteria include clamping voltage under 1A surge (17V), dynamic resistance (0.5Ω), thermal resistance (500°C/W), and compatibility with space-constrained PCB layouts requiring <0.53mm profile height.
Technical Context
This TVS diode operates as a voltage-clamped transient suppressor across signal lines, triggering at ≥19V to shunt ESD energy away from sensitive IC inputs. Its low 0.3pF capacitance ensures minimal signal distortion on 480Mbps USB 2.0 and other high-frequency interfaces.
The device uses silicon avalanche structure with optimized doping and geometry to achieve sub-nanosecond response time and stable clamping performance over -65°C to +150°C. Its 1A peak pulse current rating (8/20µs) and 17V clamping voltage at 1A enable robust protection without compromising signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 19V min - Ensures reliable conduction only above normal signal swing, avoiding false triggering on 18V-rated lines. |
| Clamping Voltage (VCL) | 17V max at 1A - Limits voltage seen by protected IC to safe level during ESD event. |
| Junction Capacitance (CT) | 0.3pF typ at 0V - Preserves signal rise/fall times and bandwidth on high-speed differential pairs. |
| ESD Rating | ±14kV contact / ±15kV air per IEC 61000-4-2 - Meets industrial and consumer end-equipment immunity requirements. |
| Package Size | X1-DFN1006-2 (1.08 × 0.68 × 0.53 mm) - Enables placement adjacent to connectors on ultra-thin mobile PCBs. |
| Thermal Resistance (RθJA) | 500°C/W - Requires minimal copper area for thermal management in FR-4 layouts. |
Pinout & Package
Package: X1-DFN1006-2 - 2-terminal, bottom-exposed thermal pad, no internal die attach paddle; pin 1 marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to signal line requiring ESD protection; bidirectional operation means either terminal may serve as anode or cathode depending on transient polarity. |
| Pin 2 | Cathode | Connected to ground reference plane; low-inductance path essential for effective ESD current diversion. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low capacitance | 0.3pF typical - Enables use on USB 2.0, HDMI, and MIPI D-PHY without degrading eye diagram or jitter budget. |
| IEC 61000-4-2 compliance | ±14kV contact / ±15kV air - Validated protection level for handheld device drop-test and handling scenarios. |
| Low-profile footprint | 0.53mm max height - Fits within mechanical envelope of slim smartphones and wearables. |
| Green construction | Halogen- and antimony-free, RoHS 3 compliant - Meets global environmental compliance mandates without performance trade-off. |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
Use Scenario: Protecting D+ and D− lines of USB 2.0 ports in smartphones against repeated ESD events during cable insertion/removal. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector, shunting transients before they reach USB transceiver IC. Use Value: 0.3pF capacitance avoids signal integrity degradation at 480Mbps, while 17V clamping prevents damage to 3.3V-tolerant PHY inputs. | Use Scenario: Shielding TMDS clock and data channels in portable HDMI adapters from user-handling ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS placed inline between source and sink, preserving differential skew and common-mode rejection. Use Value: Sub-0.5pF total capacitance maintains >250MHz bandwidth required for 720p/1080p video transmission. |
| Smartphone Audio Jack Protection | Digital Camera SDIO Interface |
Use Scenario: Guarding microphone and headset detection lines in 3.5mm TRRS jacks against pocket discharge events. IC Role / Device Role / Timing Role: Single-channel TVS bridging analog audio path to ground, activated only during ESD surges. Use Value: 19V VBR exceeds maximum audio signal swing (<3V), eliminating DC loading or distortion during normal operation. | Use Scenario: Securing SDIO command/data lines in compact digital cameras exposed to frequent card insertion/removal. IC Role / Device Role / Timing Role: Point-of-entry protection at microSD slot, limiting transient voltage before reaching host controller GPIOs. Use Value: 1A IPP rating handles multiple ESD strikes without parametric shift, supporting >10,000 insertion cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J18A-Q | Higher capacitance (12pF), larger SMA package (4.5 × 2.7 mm), 18V VRWM, 28.2V VCL at 1A | Suitable for lower-speed, board-level protection; not viable for USB/HDMI due to capacitance and size | Select when PCB space allows and signal bandwidth <10MHz. |
| TPD2E001DRYR | 0.8pF capacitance, 5V VRWM, dual-channel, X2SON-6 package | Designed for 5V logic-level interfaces like I²C; insufficient VBR margin for 18V systems | Prefer for multi-line protection where system voltage ≤5.5V and layout permits 0.8pF. |
Compared with SMA6J18A-Q and TPD2E001DRYR, DESD18VF1BL-7B uniquely balances ultra-low capacitance (0.3pF), compact footprint (1.08 × 0.68 mm), and 19V breakdown-making it the only option validated for 18V-rated high-speed data lines in space-constrained portable designs.
Availability
DESD18VF1BL-7B is available at Aetrix Electronics and suitable for cellular handsets, portable electronics, and computers and peripherals requiring stable component supply with consistent lead-time and full traceability.
Supply support for DESD18VF1BL-7B 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability protection, power management, and signal integrity solutions for consumer, industrial, and automotive markets.
This part belongs to Diodes' DESD ultra-low-capacitance TVS family, engineered specifically for ESD hardening of high-speed serial interfaces in battery-powered portable devices where board space and signal fidelity are critical constraints.
FAQ
What is the maximum operating temperature range for DESD18VF1BL-7B?
The device operates reliably from -65°C to +150°C, with derating applied above 25°C ambient per its 500°C/W thermal resistance. This wide range supports deployment in automotive cabin modules, industrial handhelds, and outdoor portable equipment where ambient extremes occur.
Does DESD18VF1BL-7B require external biasing or control signals?
No. It is a passive, two-terminal device that functions solely via avalanche breakdown when transient voltage exceeds 19V. No power supply, enable pin, or configuration is needed-operation is fully automatic and instantaneous (sub-nanosecond response).
Can DESD18VF1BL-7B protect AC-coupled high-speed lines like USB 2.0?
Yes. Its bidirectional structure and 0.3pF capacitance allow direct placement on AC-coupled differential pairs without affecting DC bias or signal integrity. It has been validated on USB 2.0 traces per USB-IF compliance test plans with no eye diagram degradation.
Is there an automotive-grade version of this TVS diode?
Yes-the DESD18VF1BLQ variant is AEC-Q200 qualified and specified for automotive applications. It shares identical electrical parameters and package but undergoes extended reliability testing including temperature cycling, humidity bias, and vibration per automotive standards.
DESD18VF1BL-7B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 0402 (1006 Metric)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18V (Max)
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 17V
- Current - Peak Pulse (10/1000µs):
- 1A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 0.3pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X1-DFN1006-2
DESD18VF1BL-7B FAQ
1.How can I place an order for DESD18VF1BL-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for DESD18VF1BL-7B 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 DESD18VF1BL-7B reliable?
The price and inventory of DESD18VF1BL-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DESD18VF1BL-7B is usually 5 days.
3.What payment methods are accepted for DESD18VF1BL-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DESD18VF1BL-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DESD18VF1BL-7B?
DESD18VF1BL-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DESD18VF1BL-7B 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 DESD18VF1BL-7B?
For technical support, including DESD18VF1BL-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DESD18VF1BL-7B requirements.
6.How does Aetrix verify that DESD18VF1BL-7B is sourced from the original manufacturer or authorized distributors?
All DESD18VF1BL-7B 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 DESD18VF1BL-7B meets industry standards.
7.What is the process for return or replacement of DESD18VF1BL-7B?
All DESD18VF1BL-7B units undergo pre-shipment inspection (PSI). If there is an issue with DESD18VF1BL-7B, 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 DESD18VF1BL-7B part is unused and in its original packaging.
Return procedure for DESD18VF1BL-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DESD18VF1BL-7B Tags
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