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Vishay SMF14A-HE3_A18
- Part No.:
- SMF14A-HE3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF14A-HE3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,069
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Product details
Overview
SMF14A-HE3_A18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for transient voltage suppression in high-speed data lines. It features a 14 V stand-off voltage (VRWM), 23.2 V maximum clamping voltage at 8.6 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is AEC-Q101 qualified and used in automotive infotainment interfaces.
For engineers reviewing the SMF14A-HE3_A18 datasheet, SMF14A-HE3_A18 pinout, SMF14A-HE3_A18 application, or SMF14A-HE3_A18 equivalent, this page delivers verified electrical specs, package dimensions, real-world clamping behavior, AEC-Q101 qualification status, and validated alternative parts for automotive-grade circuit protection design.
Technical Context
The SMF14A-HE3_A18 operates as a unidirectional TVS diode with avalanche breakdown mechanism, optimized for fast response to electrostatic discharge events. Its low incremental surge resistance ensures tight clamping during transients, while its 392 pF typical capacitance at 0 V enables use on moderate-speed signal lines such as USB 2.0 or CAN FD interfaces without excessive signal distortion.
Designed for reflow and wave soldering per J-STD-020 MSL level 1, it maintains stable performance across -65 °C to +175 °C operating temperature range and supports 50 A non-repetitive forward surge current. The device meets AEC-Q101 stress test requirements including HBM >8 kV and IEC 61000-4-2 ±30 kV contact/air discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 14 V - Maximum continuous reverse voltage before conduction begins; sets protection threshold for 12 V automotive systems. |
| Clamping Voltage (VC) | 23.2 V max at 8.6 A - Limits voltage seen by downstream ICs during 10/1000 μs surge; critical for safeguarding 16 V-tolerant receivers. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains defined transient energy without failure; sufficient for ISO 16750-2 load dump edge cases. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest industrial and automotive ESD robustness class. |
| Capacitance | 392 pF at 0 V, 1 MHz - Enables use on sub-10 Mbps serial buses; avoids signal integrity issues on LIN or SENT lines. |
| AEC-Q101 Qualified | Yes - Validated for automotive underhood and cabin applications per stress test requirements including temperature cycling and HTRB. |
| Package | DO-219AB (SOD-123W compatible) - 3.9 mm × 1.9 mm × 1.08 mm low-profile footprint; supports automated placement and high-density PCB layouts. |
Pinout & Package
SMF14A-HE3_A18 uses the DO-219AB (SMF) package: cathode-marked, single-diode configuration in a low-profile surface-mount outline measuring 3.9 mm × 1.9 mm × 1.08 mm. Compatible with SOD-123W, SOD-123F, and SOD-123FL footprints per Vishay's mechanical specification S8-V-3915.01-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protection path | Connected to protected line (e.g., CAN_H); conducts surge current toward ground when clamped. |
| Cathode | Output side / reference node | Connected to system ground; defines unidirectional polarity; marked by bar on top surface. |
Key Features
| Feature | Design Value |
|---|---|
| Low-clamp architecture | 23.2 V VC at 8.6 A enables protection of 24 V-rated interface ICs without overvoltage stress. |
| "Low Noise" fast response | Sub-nanosecond turn-on time minimizes voltage overshoot during ESD events per IEC 61000-4-2 waveform. |
| AEC-Q101 qualification | Validated for automotive reliability including HTGB, TCT, and HTRB - suitable for Tier-1 module designs. |
| Reflow/wave solder compatible | Rated for peak reflow temperature up to 260 °C (J-STD-020 Class 2), supporting standard SMT assembly lines. |
| UL 94 V-0 molding compound | Flame-retardant encapsulation meets automotive and industrial safety standards for board-level fire resistance. |
Applications
| Automotive CAN FD Bus Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting CAN FD transceivers in vehicle body control modules against ESD and load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between CAN_H/CAN_L and chassis ground to clamp surges before they reach the transceiver. Use Value: 23.2 V clamping ensures transceiver inputs remain below absolute maximum rating during 8.6 A surge; ±30 kV ESD rating exceeds ISO 10605 requirements. | Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs exposed to cable-induced surges and operator ESD. IC Role / Device Role / Timing Role: Line-side transient suppressor on differential bus lines, referenced to local ground plane. Use Value: 392 pF capacitance avoids signal rise-time degradation on 10 Mbps RS-485 links; 200 W pulse rating handles IEC 61000-4-5 8/20 μs surges. |
| USB 2.0 Data Line Protection | Automotive LIN Bus Node |
Use Scenario: ESD protection for USB 2.0 D+ and D− lines in infotainment head units. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode pair (two devices) placed inline with each data line to ground. Use Value: Low 392 pF capacitance preserves 480 Mbps signal integrity; ±30 kV contact discharge rating exceeds USB-IF ESD compliance thresholds. | Use Scenario: Transient suppression on LIN slave nodes in door modules and seat controllers. IC Role / Device Role / Timing Role: Single-point protection diode between LIN bus and ground, leveraging 14 V VRWM to match 12 V system nominal voltage. Use Value: AEC-Q101 qualification ensures long-term reliability in temperature-cycled environments; 175 °C max junction temperature supports under-hood deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A-E3/57T | Higher clamping voltage (25.8 V), larger SMA package (4.5 mm × 2.7 mm), same 14 V VRWM and AEC-Q101 qualification. | Less suitable for space-constrained automotive modules; better thermal dissipation in high-power surge scenarios. | Select SMAJ14A-E3/57T only if board layout allows larger footprint and higher clamping is acceptable for downstream IC ratings. |
| TPSMF14A | Same DO-219AB package, identical VRWM and VC specs, but rated for 300 W (10/1000 μs) and includes integrated thermal pad for enhanced power handling. | Preferred for designs requiring extended surge endurance beyond 200 W, e.g., battery management system front-ends. | Choose TPSMF14A when surge repetition or higher-energy transients are expected; otherwise SMF14A-HE3_A18 offers cost-optimized AEC-Q101 compliance. |
Compared with SMAJ14A-E3/57T and TPSMF14A, SMF14A-HE3_A18 delivers optimal balance of compact size, automotive qualification, and precise 23.2 V clamping-making it ideal for volume automotive electronics where PCB area and consistent low-voltage clamping are prioritized over extreme power handling.
Availability
SMF14A-HE3_A18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial fieldbus interfaces, and consumer USB peripheral protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMF14A-HE3_A18 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
Vishay Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with leadership in TVS diodes, MOSFETs, and precision resistors.
The SMF series targets high-reliability transient suppression in automotive and industrial applications, emphasizing AEC-Q101 qualification, low-profile packaging, and repeatable clamping performance across temperature extremes.
FAQ
What is the clamping voltage of SMF14A-HE3_A18 at its rated peak pulse current?
The SMF14A-HE3_A18 has a maximum clamping voltage (VC) of 23.2 V at 8.6 A peak pulse current (10/1000 μs waveform), as specified in Vishay's Document Number 85881 Rev. 2.4. This value ensures protected ICs see no more than 23.2 V during standardized surge events, making SMF14A-HE3_A18 suitable for 12 V–24 V system interfaces where downstream components have ≤24 V absolute maximum ratings.
Is SMF14A-HE3_A18 qualified to AEC-Q101, and what tests does that include?
Yes, SMF14A-HE3_A18 is AEC-Q101 qualified per Vishay's documentation. This includes human body model (HBM) testing >8 kV, temperature cycling, high-temperature reverse bias (HTRB), and unbiased highly accelerated stress test (UHAST). These tests validate reliability for automotive under-hood and cabin applications, confirming SMF14A-HE3_A18 meets stringent lifetime and environmental stress requirements beyond standard industrial grades.
What is the package type and dimensions of SMF14A-HE3_A18?
SMF14A-HE3_A18 uses the DO-219AB (SMF) package: 3.9 mm length × 1.9 mm width × 1.08 mm height, with cathode marking on the top surface. Its footprint matches SOD-123W and is compatible with SOD-123F/SOD-123FL land patterns. The package is rated MSL level 1 and supports peak reflow temperatures up to 260 °C, per Vishay's mechanical drawing S8-V-3915.01-001.
How does the capacitance of SMF14A-HE3_A18 affect high-speed signal lines?
SMF14A-HE3_A18 has a typical capacitance of 392 pF at 0 V and 1 MHz. This value is appropriate for signal lines up to ~10 Mbps (e.g., LIN, SENT, RS-485), but may cause excessive rise-time degradation on USB 2.0 or HDMI lines unless used in differential pairs with careful layout. For USB 2.0, SMF14A-HE3_A18 is viable only when paired with low-capacitance routing and short trace lengths - always verify eye diagram integrity in final design.
Can SMF14A-HE3_A18 be used in bidirectional protection configurations?
No - SMF14A-HE3_A18 is a unidirectional TVS diode, intended for single-polarity protection (e.g., power rail to ground or signal line to ground in DC-biased systems). For true bidirectional protection (e.g., AC-coupled data lines), two SMF14A-HE3_A18 devices must be connected anode-to-anode or cathode-to-cathode. Vishay does not specify SMF14A-HE3_A18 for standalone bidirectional operation; using it as such risks incomplete clamping during negative transients.
SMF14A-HE3_A18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay
- Package/Case:
- DO-219AB
- Series:
- eSMP®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 392pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF14A-HE3_A18 FAQ
1.How can I place an order for SMF14A-HE3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF14A-HE3_A18 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 SMF14A-HE3_A18 reliable?
The price and inventory of SMF14A-HE3_A18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF14A-HE3_A18 is usually 5 days.
3.What payment methods are accepted for SMF14A-HE3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF14A-HE3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF14A-HE3_A18?
SMF14A-HE3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF14A-HE3_A18 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 SMF14A-HE3_A18?
For technical support, including SMF14A-HE3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF14A-HE3_A18 requirements.
6.How does Aetrix verify that SMF14A-HE3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF14A-HE3_A18 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 SMF14A-HE3_A18 meets industry standards.
7.What is the process for return or replacement of SMF14A-HE3_A18?
All SMF14A-HE3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF14A-HE3_A18, 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 SMF14A-HE3_A18 part is unused and in its original packaging.
Return procedure for SMF14A-HE3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF14A-HE3_A18 Tags
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