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Vishay SMF43A-HE3_A18
- Part No.:
- SMF43A-HE3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF43A-HE3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,707
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Product details
Overview
SMF43A-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 43 V standoff voltage (VRWM), 47.8–52.9 V breakdown range (VBR), 69.4 V maximum clamping voltage at 2.9 A peak pulse current, and 200 W peak pulse power (10/1000 μs). It is used in USB 2.0, HDMI, and industrial I/O interfaces requiring ±30 kV IEC 61000-4-2 ESD protection.
For engineers reviewing the SMF43A-HE3_A18 datasheet, SMF43A-HE3_A18 pinout, SMF43A-HE3_A18 application, or SMF43A-HE3_A18 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, SOD-123W-compatible packaging, low-capacitance (165 pF @ 0 V) performance, and real-world ESD immunity metrics - all critical for high-reliability interface protection design.
Technical Context
This device operates as a unidirectional TVS diode with avalanche breakdown behavior, optimized for fast response (<1 ns) to electrostatic discharge events per IEC 61000-4-2. Its low incremental surge resistance ensures minimal voltage overshoot during transient clamping, while its 165 pF junction capacitance at 0 V enables use on 480 Mbps USB 2.0 lines without signal integrity degradation.
The SMF43A-HE3_A18 is rated for continuous operation from –65 °C to +175 °C, supports wave and reflow soldering (peak 260 °C), and meets AEC-Q101 stress testing for automotive-grade reliability. Its DO-219AB package provides MSL Level 1 moisture sensitivity and 180 K/W thermal resistance on standard epoxy-glass PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 43 V - Maximum continuous reverse voltage before significant leakage; sets operating margin for 36–40 V supply rails. |
| Breakdown Voltage (VBR) | 47.8–52.9 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system operating voltage. |
| Clamping Voltage (VC) | 69.4 V @ 2.9 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; limits downstream IC stress. |
| Junction Capacitance (CD) | 165 pF @ 0 V, 1 MHz - Low enough for USB 2.0 full-speed signaling; avoids signal rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Full compliance with industrial and automotive ESD immunity requirements. |
| Peak Pulse Power | 200 W @ 10/1000 μs - Sustains short-duration transients common in board-level ESD events. |
| Operating Temp Range | –65 °C to +175 °C - Supports under-hood automotive, industrial control, and harsh-environment deployment. |
Pinout & Package
SMF43A-HE3_A18 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), SOD-123W-compatible outline, cathode-bar marked, 3.9 × 1.9 mm footprint. Mold compound is UL 94 V-0 rated; terminals are tin-plated, lead (Pb)-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Input side of protection path | Connected to signal line being protected; conducts surge current toward ground when clamped. |
| Cathode (Pin 2) | Ground reference terminal | Connected to system ground plane; establishes reference for clamping action and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| "Low Noise" fast-response technology | Sub-nanosecond response time ensures clamping initiates before ESD pulse edge damages sensitive receivers. |
| AEC-Q101 qualification | Validated for automotive electronics per human body model (>8 kV H3B), enabling use in infotainment and ADAS interfaces. |
| Low incremental surge resistance | Minimizes voltage overshoot during high-di/dt transients, improving clamping precision over competing TVS devices. |
| Reflow/wave solder compatible | Rated for peak temperatures up to 260 °C, supporting modern high-volume SMT assembly without delamination or parametric shift. |
| MSL Level 1 rating | Zero floor-life limitation - can be stored indefinitely before reflow, eliminating bake-out requirements and handling overhead. |
Applications
| USB 2.0 Interface Protection | HDMI Data Line Protection |
|---|---|
Use Scenario: Protecting D+ and D− lines in embedded host/device USB ports against ESD events during cable insertion or handling. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and ground, clamping transients before they reach USB transceiver ICs. Use Value: 165 pF capacitance preserves 480 Mbps signal integrity; ±30 kV ESD rating exceeds IEC 61000-4-2 system-level test requirements. | Use Scenario: Safeguarding TMDS clock and data channels in industrial displays and media players exposed to field ESD. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor on differential pairs, maintaining impedance continuity while diverting surges. Use Value: 43 V VRWM aligns with HDMI 1.4/2.0 common-mode voltage margins; low clamping (69.4 V) prevents receiver latch-up. |
| Automotive Body Control Module I/O | Industrial CAN FD Transceiver Interface |
Use Scenario: Protecting LIN bus pins and sensor inputs in BCMs subjected to hot-swap and load-dump induced transients. IC Role / Device Role / Timing Role: Primary ESD clamp on low-speed digital I/O lines, operating within –65 °C to +175 °C ambient range. Use Value: AEC-Q101 qualification and 175 °C junction rating support under-dash deployment; 200 W pulse rating handles ISO 7637-2 burst energy. | Use Scenario: Front-end ESD protection for CAN FD physical layer transceivers in factory automation gateways. IC Role / Device Role / Timing Role: Secondary protection stage after common-mode choke, absorbing residual ESD not filtered upstream. Use Value: 165 pF capacitance avoids CAN FD bit-rate distortion (up to 5 Mbps); unidirectional polarity matches CAN bus grounding architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-E3/57T | DO-214AC (SMA) package; 1.9 mm height vs. SMF's 1.08 mm; 200 W same rating; 70 V VC @ 2.9 A. | Higher profile limits use in ultra-thin portable designs; less suitable for fine-pitch automated placement. | Choose SMAJ43A-E3/57T only if legacy SMA footprint compatibility is required or thermal mass demand exceeds SMF capability. |
| TPSMF43A | Same DO-219AB package; 69.4 V VC identical; 165 pF CD identical; but RoHS-compliant only (no AEC-Q101 qualification). | Lacks automotive qualification; not approved for safety-critical vehicle subsystems. | Select TPSMF43A for cost-sensitive industrial or consumer applications where AEC-Q101 is not mandated. |
Compared with SMAJ43A-E3/57T and TPSMF43A, SMF43A-HE3_A18 uniquely combines AEC-Q101 qualification, ultra-low profile (1.08 mm), and verified 165 pF/69.4 V performance - making it optimal for space-constrained automotive and high-speed interface designs requiring certified reliability.
Availability
SMF43A-HE3_A18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive body control module I/O, and industrial CAN FD transceiver interface applications requiring stable component supply across production lifecycles.
Supply support for SMF43A-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 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 was developed specifically for high-speed data line ESD protection, balancing low capacitance, fast response, and AEC-Q101 qualification - targeting USB, HDMI, and automotive serial bus interfaces.
FAQ
What is the maximum clamping voltage of the SMF43A-HE3_A18 under standard IEC 61000-4-5 surge conditions?
The SMF43A-HE3_A18 has a maximum clamping voltage of 69.4 V at 2.9 A peak pulse current using the 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and represents the highest voltage imposed on the protected circuit during a standardized surge event. The SMF43A-HE3_A18 maintains this clamping performance across its full operating temperature range.
Is SMF43A-HE3_A18 qualified to AEC-Q101, and what does that qualification cover?
Yes, SMF43A-HE3_A18 is AEC-Q101 qualified, covering stress tests including human body model ESD (>8 kV, Class H3B), temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. This qualification confirms suitability for automotive electronic modules where reliability under thermal and electrical stress is mandatory. The SMF43A-HE3_A18 achieves this while retaining its 43 V standoff and 165 pF capacitance.
What is the junction capacitance of SMF43A-HE3_A18, and how does it affect high-speed signal lines?
The SMF43A-HE3_A18 exhibits 165 pF typical junction capacitance at 0 V and 1 MHz. This low value minimizes loading on high-speed signals - for example, preserving rise/fall times on USB 2.0 D+/D− lines running at 480 Mbps. Capacitance remains stable across bias voltage, ensuring consistent signal integrity. The SMF43A-HE3_A18's capacitance is verified in production test and documented in Vishay's Rev. 2.4 datasheet.
Can SMF43A-HE3_A18 be used in bidirectional signal paths like RS-485 or CAN?
No - SMF43A-HE3_A18 is a unidirectional TVS diode, intended for single-ended or ground-referenced lines such as USB D+, HDMI TMDS+, or LIN bus. For true bidirectional protection (e.g., RS-485, CAN), a symmetric dual-diode configuration or dedicated bidirectional TVS like SMBJ43CA is required. Using SMF43A-HE3_A18 on a bidirectional line risks forward conduction during normal signal swings, disrupting communication. Always verify polarity alignment before placing SMF43A-HE3_A18.
What is the moisture sensitivity level (MSL) rating for SMF43A-HE3_A18, and how does it impact manufacturing?
SMF43A-HE3_A18 carries an MSL Level 1 rating per J-STD-020, meaning it has no floor-life limitation and may be stored indefinitely before reflow soldering without baking. This eliminates moisture-related popcorning risk and simplifies SMT line logistics. The SMF43A-HE3_A18's DO-219AB package construction and UL 94 V-0 molding compound contribute to this robust MSL classification, confirmed in Vishay's official package data sheet.
SMF43A-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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 2.9A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 165pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF43A-HE3_A18 FAQ
1.How can I place an order for SMF43A-HE3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF43A-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 SMF43A-HE3_A18 reliable?
The price and inventory of SMF43A-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 SMF43A-HE3_A18 is usually 5 days.
3.What payment methods are accepted for SMF43A-HE3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF43A-HE3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF43A-HE3_A18?
SMF43A-HE3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF43A-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 SMF43A-HE3_A18?
For technical support, including SMF43A-HE3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF43A-HE3_A18 requirements.
6.How does Aetrix verify that SMF43A-HE3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF43A-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 SMF43A-HE3_A18 meets industry standards.
7.What is the process for return or replacement of SMF43A-HE3_A18?
All SMF43A-HE3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF43A-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 SMF43A-HE3_A18 part is unused and in its original packaging.
Return procedure for SMF43A-HE3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF43A-HE3_A18 Tags
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