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Vishay SMF18A-HM3_A08
- Part No.:
- SMF18A-HM3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF18A-HM3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,636
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Product details
Overview
SMF18A-HM3_A08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for high-speed data lines and power rails requiring ±30 kV IEC 61000-4-2 ESD immunity. It features a 18 V stand-off voltage (VRWM), 29.2 V maximum clamping voltage at 6.8 A peak pulse current, and 200 W peak pulse power (10/1000 μs). It is AEC-Q101 qualified and used in automotive infotainment interfaces.
For engineers reviewing the SMF18A-HM3_A08 datasheet, SMF18A-HM3_A08 pinout, SMF18A-HM3_A08 application, or SMF18A-HM3_A08 equivalent, key selection criteria include clamping voltage under 30 V at 6.8 A, low 320 pF capacitance at 0 V, SOD-123W-compatible DO-219AB footprint, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a unidirectional transient voltage suppression (TVS) diode with avalanche breakdown behavior. Its junction structure enables fast response (<1 ns) to ESD transients and low incremental surge resistance for effective clamping during 8/20 μs and 10/1000 μs surges per IEC 61000-4-5.
The SMF18A-HM3_A08 integrates "Low Noise" technology to minimize signal distortion on high-speed lines while maintaining robust ±30 kV contact/air discharge immunity per IEC 61000-4-2 and H3B-class human body model (>8 kV) per AEC-Q101.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 18 V - Maximum continuous reverse voltage before conduction begins; defines operating margin for 12–15 V automotive bus lines. |
| Clamping Voltage (VC) | 29.2 V max at IPPM = 6.8 A - Limits transient voltage seen by downstream ICs during ESD events. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains high-energy transients without failure in industrial and automotive environments. |
| Capacitance (CD) | 320 pF at VR = 0 V, f = 1 MHz - Low enough for USB 2.0 and CAN FD signal integrity preservation. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest level of system-level ESD robustness required for exposed connectors. |
| AEC-Q101 Qualified | Yes - Validated for automotive applications including temperature cycling, mechanical shock, and humidity testing. |
| Package | DO-219AB (SMF) - Industry-standard low-profile SMD outline compatible with SOD-123W PCB footprints and reflow processes. |
Pinout & Package
SMF18A-HM3_A08 uses the DO-219AB (SMF) package: 3.9 mm × 1.9 mm × 1.08 mm, cathode-bar marked, single-channel unidirectional configuration. Mounting requires 1.3 mm × 1.3 mm pad layout per Vishay footprint recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line (e.g., CAN_H); conducts during negative transients when cathode is biased higher. |
| Cathode | Ground/reference side | Connected to chassis or local ground plane; provides low-impedance path to shunt ESD energy away from ICs. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast response time | <1 ns rise time - Clamps ESD pulses before sensitive IC inputs are overstressed. |
| Low clamping ratio | VC/VRWM = 1.62 - Minimizes overvoltage stress on protected circuitry relative to operating voltage. |
| Reflow-solderable construction | Peak temperature rated to 260 °C - Compatible with standard lead-free PCB assembly processes. |
| Low-profile packaging | Height ≤1.08 mm - Enables use in space-constrained modules such as ADAS camera housings and telematics units. |
| High surge current capability | IPPM = 6.8 A (10/1000 μs) - Withstands multiple ESD strikes without degradation in automotive lifecycle testing. |
Applications
| Automotive CAN Bus Protection | USB 2.0 Interface Protection |
|---|---|
Use Scenario: Protecting CAN_H/CAN_L lines in vehicle body control modules against ESD from connector mating/unmating and cable discharge. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between each CAN line and chassis ground to clamp transients below transceiver damage threshold. Use Value: Maintains CAN signal integrity with only 320 pF capacitance while delivering ±30 kV ESD immunity and AEC-Q101 qualification for 15-year automotive service life. | Use Scenario: Safeguarding USB 2.0 D+ and D− lines in infotainment head units from user-hand ESD events during plug insertion. IC Role / Device Role / Timing Role: Bidirectional protection implemented using two SMF18A-HM3_A08 devices (anode-to-line, cathode-to-ground) per differential pair. Use Value: Enables full-speed (480 Mbps) operation without signal attenuation due to low 320 pF capacitance and sub-1 ns response time. |
| Industrial Sensor Interface | Power Rail Clamp for 12 V Systems |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC I/O modules from field-induced ESD. IC Role / Device Role / Timing Role: Single-point unidirectional clamp on sensor output line referenced to system ground. Use Value: Prevents latch-up or input-stage damage in precision op-amps and ADCs while adding negligible noise or offset error. | Use Scenario: Protecting 12 V power distribution networks in automotive ECUs from load-dump and jump-start induced transients. IC Role / Device Role / Timing Role: Standby clamping device across VCC and GND, activated only during overvoltage excursions exceeding 18 V. Use Value: Complements primary TVS arrays by providing secondary clamping at lower cost and smaller footprint than high-power alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/57T | Higher clamping voltage (32.4 V), larger SMA (DO-214AC) package, 400 pF capacitance | Less suitable for high-speed data lines; better for general-purpose 12 V rail clamping where size is not constrained | Select when board space allows larger footprint and higher VC is acceptable for non-critical power rails. |
| TPD2E001DRYR | Bi-directional dual-channel array, 12 pF typical capacitance, 5 V VRWM, not AEC-Q101 qualified | Designed for USB/SDIO signal pairs; lacks automotive qualification and 18 V standoff capability | Prefer for portable consumer electronics with tight capacitance budgets but no automotive requirements. |
Compared with SMAJ18A-E3/57T and TPD2E001DRYR, SMF18A-HM3_A08 uniquely balances AEC-Q101 qualification, 18 V standoff, 29.2 V clamping, and 320 pF capacitance in a low-profile DO-219AB package-making it optimal for automotive data-line protection where space, speed, and qualification are jointly critical.
Availability
SMF18A-HM3_A08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor interfaces, and USB 2.0 peripheral designs requiring stable component supply and long-term production continuity.
Supply support for SMF18A-HM3_A08 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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets high-speed interface protection with AEC-Q101 qualification, optimized for CAN, LIN, USB, and sensor signal lines where low capacitance, fast response, and automotive-grade reliability are mandatory.
FAQ
What is the maximum clamping voltage of SMF18A-HM3_A08 under standard test conditions?
The SMF18A-HM3_A08 has a maximum clamping voltage (VC) of 29.2 V when subjected to a 6.8 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and ensures downstream ICs remain within safe operating limits during surge events. The clamping performance is guaranteed across the full -65 °C to +175 °C operating temperature range.
Is SMF18A-HM3_A08 suitable for bidirectional signal lines like USB D+ and D−?
SMF18A-HM3_A08 is unidirectional, but it can be used for bidirectional protection by placing one device anode-to-line and cathode-to-ground on each line of a differential pair. This configuration maintains ±30 kV ESD immunity and preserves signal integrity with only 320 pF capacitance per line-validated for USB 2.0 full-speed operation in Vishay's application notes.
Does SMF18A-HM3_A08 meet automotive qualification standards?
Yes, SMF18A-HM3_A08 is AEC-Q101 qualified, having passed stress tests including temperature cycling, mechanical shock, humidity, and ESD per human body model (H3B >8 kV). The qualification applies specifically to this part number and confirms suitability for automotive powertrain, body, and infotainment systems requiring long-term reliability under harsh environmental conditions.
What is the thermal resistance (RthJA) of SMF18A-HM3_A08 on a standard PCB?
The junction-to-ambient thermal resistance (RthJA) of SMF18A-HM3_A08 is 180 K/W when mounted on an epoxy-glass PCB with 3 mm × 3 mm copper pads ≥40 μm thick. This value supports reliable operation up to 175 °C junction temperature during repetitive surge events, provided PCB layout follows Vishay's recommended footprint and thermal pad guidelines.
How does the capacitance of SMF18A-HM3_A08 affect high-speed signal integrity?
With a typical capacitance of 320 pF at 0 V bias and 1 MHz, SMF18A-HM3_A08 introduces minimal loading on low-to-moderate speed digital lines such as CAN FD (up to 5 Mbps) and USB 2.0 (480 Mbps). Its low capacitance-combined with sub-1 ns response-prevents signal edge degradation and reflection, making it suitable for interfaces where timing margins are tight and ESD robustness is non-negotiable.
SMF18A-HM3_A08 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 6.8A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 320pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF18A-HM3_A08 FAQ
1.How can I place an order for SMF18A-HM3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF18A-HM3_A08 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 SMF18A-HM3_A08 reliable?
The price and inventory of SMF18A-HM3_A08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF18A-HM3_A08 is usually 5 days.
3.What payment methods are accepted for SMF18A-HM3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF18A-HM3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF18A-HM3_A08?
SMF18A-HM3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF18A-HM3_A08 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 SMF18A-HM3_A08?
For technical support, including SMF18A-HM3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF18A-HM3_A08 requirements.
6.How does Aetrix verify that SMF18A-HM3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF18A-HM3_A08 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 SMF18A-HM3_A08 meets industry standards.
7.What is the process for return or replacement of SMF18A-HM3_A08?
All SMF18A-HM3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF18A-HM3_A08, 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 SMF18A-HM3_A08 part is unused and in its original packaging.
Return procedure for SMF18A-HM3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF18A-HM3_A08 Tags
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