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Vishay General Semiconductor - Diodes Division SMF43A-HM3-08
- Part No.:
- SMF43A-HM3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF43A-HM3-08.pdf
- Description:
- TVS DIODE 43VWM 69.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:9,094
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Product details
Overview
SMF43A-HM3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in DO-219AB (SOD-123W) package, designed for clamping transient overvoltages on signal lines. It features 43 V stand-off voltage (VRWM), 69.4 V maximum reverse clamping voltage at 2.9 A peak pulse current, 165 pF typical capacitance at 0 V, ±30 kV IEC 61000-4-2 ESD immunity, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMF43A-HM3-08 datasheet, SMF43A-HM3-08 pinout, SMF43A-HM3-08 application, or SMF43A-HM3-08 equivalent, this device is selected for high-reliability ESD protection in automotive infotainment interfaces, industrial sensor signal conditioning, and USB 2.0 data line surge suppression where low capacitance and fast response are critical.
Technical Context
The SMF43A-HM3-08 operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior. Its junction structure enables sub-nanosecond response to ESD transients and stable clamping under 10/1000 μs surge waveforms up to 200 W peak pulse power.
It is optimized for DC-coupled signal paths requiring minimal capacitive loading - its 165 pF capacitance at 0 V and <0.1 μA leakage at 43 V support integrity of high-speed analog and digital signals while maintaining robust 175 °C operating temperature capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 43 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin for 36 V nominal automotive supply rails. |
| Clamping Voltage (VC) | 69.4 V at IPPM = 2.9 A - Peak voltage seen by protected circuit during 10/1000 μs surge; ensures downstream ICs rated ≥70 V survive transient events. |
| Capacitance (CD) | 165 pF at VR = 0 V, f = 1 MHz - Low enough for USB 2.0 (480 Mbps) and CAN FD signal integrity without excessive rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - Meets highest industrial and automotive ESD immunity requirements without external shielding. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains repeated low-duty-cycle surges in battery-connected modules exposed to load dump or coupling noise. |
| AEC-Q101 Qualified | Qualified per AEC-Q101 Rev D - Validated for automotive under-hood and cabin applications including infotainment, body control, and ADAS sensor interfaces. |
| Package | DO-219AB (SOD-123W) - 3.9 mm × 1.9 mm × 1.08 mm low-profile outline compatible with automated SMT assembly and reflow profiles up to 260 °C. |
Pinout & Package
SMF43A-HM3-08 uses the DO-219AB (SOD-123W) surface-mount package: cathode-marked anode-cathode configuration in a single-row, two-terminal plastic case. Dimensions: 3.9 mm length × 1.9 mm width × 1.08 mm height. Compatible with standard 8 mm tape-and-reel packaging (08 = 3K per 7″ reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Input side of protection path | Connected to signal line or power rail requiring ESD clamping; forms forward-biased path during negative transients. |
| Cathode (bar-marked end) | Clamp reference terminal | Connected to ground or low-impedance return path; provides low-impedance discharge route for positive ESD pulses. |
Key Features
| Feature | Design Value |
|---|---|
| Low incremental surge resistance | Enables tight clamping window (69.4 V at 2.9 A) with minimal voltage overshoot during fast-rising ESD events. |
| "Low Noise" fast-response technology | Sub-nanosecond response time ensures clamping activation before sensitive IC inputs exceed absolute maximum ratings. |
| Wave and reflow solderable | Rated for peak reflow temperatures up to 260 °C (MSL Level 1), supporting high-yield automated PCB assembly without delamination. |
| AEC-Q101 qualified variant | HM3 suffix indicates AEC-Q101 compliance - validated for 1000-hour HTOL, temperature cycling, and mechanical shock per automotive stress test standards. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulant meets flammability requirements for enclosed automotive and industrial enclosures. |
Applications
| Automotive Infotainment Display Interface | Industrial RS-485 Sensor Network |
|---|---|
Use Scenario: HDMI or LVDS data lines between head unit and TFT display in vehicles exposed to ESD from user touch and harness coupling. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed inline with differential pairs to limit transient voltage without distorting signal edges. Use Value: 165 pF capacitance preserves >100 MHz signal bandwidth; ±30 kV ESD rating eliminates need for secondary shielding layers. |
Use Scenario: Termination points of long-haul RS-485 bus in factory automation systems subject to lightning-induced surges and cable coupling. IC Role / Device Role / Timing Role: Primary ESD suppressor at connector entry, shunting transients before reaching isolated transceiver ICs. Use Value: 69.4 V clamping protects ISO 8802-3 compliant transceivers (rated ≥65 V); DO-219AB footprint allows dense layout near connectors. |
| USB 2.0 Peripheral Port Protection | Automotive CAN FD Node Interface |
Use Scenario: USB 2.0 upstream port on telematics control unit handling hot-plug events and human-body ESD during service access. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (used with complementary pair or ground-referenced) on D+ and D− lines. Use Value: 165 pF capacitance avoids USB 2.0 eye diagram closure; 2.9 A IPPM handles multiple IEC 61000-4-2 pulses without degradation. |
Use Scenario: CAN FD physical layer interface in ADAS domain controller, exposed to ESD during module replacement and harness routing. IC Role / Device Role / Timing Role: Signal-line protector on CANH/CANL lines, referenced to chassis ground to clamp common-mode transients. Use Value: 43 V VRWM aligns with CAN FD bus operating range (±30 V common-mode); AEC-Q101 qualification ensures reliability across -40 °C to +125 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-E3/5A (Vishay) | DO-214AC (SMA) package; larger footprint (4.5 mm × 2.7 mm); 70 V VC at 2.8 A; 210 pF capacitance. | Higher power handling (400 W) but higher parasitic capacitance limits use in >100 Mbps interfaces. | Select SMAJ43A-E3/5A only when board space permits larger package and higher clamping voltage is acceptable for legacy 5 V logic interfaces. |
| TPD2E001DRYR (TI) | 0.65 mm × 0.65 mm DSBGA; dual-channel; 12 pF capacitance; 12 V VRWM; not AEC-Q101 qualified. | Optimized for ultra-high-speed USB 3.0/MIPI but lacks automotive qualification and 43 V standoff capability. | Choose TPD2E001DRYR for space-constrained consumer electronics with lower-voltage signal rails; not suitable for 36–48 V automotive domains. |
Compared with SMAJ43A-E3/5A and TPD2E001DRYR, SMF43A-HM3-08 uniquely balances 43 V standoff, 165 pF capacitance, AEC-Q101 qualification, and DO-219AB miniaturization-making it optimal for next-generation automotive signal protection where size, speed, and qualification converge.
Availability
SMF43A-HM3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial RS-485 networks, and USB 2.0 peripheral protection requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant traceability.
Supply support for SMF43A-HM3-08 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 manufacturer of discrete semiconductors and passive components, specializing in high-reliability solutions for automotive, industrial, and computing markets since 1962.
The SMF series belongs to Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for compact, high-speed ESD protection in automotive and industrial environments demanding AEC-Q101 validation and low parasitic capacitance.
FAQ
What is the clamping voltage of SMF43A-HM3-08 under a 10/1000 μs surge?
The SMF43A-HM3-08 has a maximum reverse clamping voltage (VC) of 69.4 V at 2.9 A peak pulse current under a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and ensures protected circuits remain within safe voltage limits during standardized surge events. The SMF43A-HM3-08 maintains this clamping performance across its full operating temperature range of -65 °C to +175 °C.
Is SMF43A-HM3-08 qualified for automotive applications?
Yes, SMF43A-HM3-08 is AEC-Q101 qualified, as confirmed by Vishay's documentation (Rev. 2.4, July 2023). The HM3 suffix denotes compliance with AEC-Q101 Rev D stress tests including HTOL, temperature cycling, and mechanical shock. This makes SMF43A-HM3-08 suitable for automotive infotainment, body electronics, and ADAS subsystems where reliability under harsh environmental conditions is mandatory.
What does the "-HM3-08" suffix mean in SMF43A-HM3-08?
The "HM3" denotes AEC-Q101 qualification and RoHS-compliant, lead-free tin plating; "08" specifies packaging in 3,000-piece 7-inch reels with 8 mm tape width. This full ordering code distinguishes SMF43A-HM3-08 from non-automotive variants like SMF43A-E3-08 (industrial grade) and confirms traceable, automotive-grade sourcing. SMF43A-HM3-08 is manufactured and tested to meet all requirements defined in the Vishay SMF series datasheet Document Number 85881.
Can SMF43A-HM3-08 be used for bidirectional signal protection?
SMF43A-HM3-08 is a unidirectional TVS diode, intended for DC-biased or ground-referenced signal lines. For true bidirectional protection (e.g., AC-coupled USB or Ethernet), two SMF43A-HM3-08 devices must be configured in series opposition or paired with a complementary device. Its 43 V VRWM and 69.4 V VC are specified for unidirectional operation; using it alone on floating differential pairs may result in incomplete clamping during negative transients.
What is the thermal resistance (RthJA) of SMF43A-HM3-08 on a standard PCB?
The junction-to-ambient thermal resistance (RthJA) of SMF43A-HM3-08 is 180 K/W when mounted on an epoxy-glass PCB with 3 mm × 3 mm copper pads ≥40 μm thick. This value assumes standard JEDEC test conditions and supports reliable operation up to 175 °C junction temperature. Layout practices such as thermal vias and extended copper pours can reduce effective RthJA in actual designs, improving surge energy dissipation for the SMF43A-HM3-08.
SMF43A-HM3-08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF43A-HM3-08 FAQ
1.How can I place an order for SMF43A-HM3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF43A-HM3-08 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-HM3-08 reliable?
The price and inventory of SMF43A-HM3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF43A-HM3-08 is usually 5 days.
3.What payment methods are accepted for SMF43A-HM3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF43A-HM3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF43A-HM3-08?
SMF43A-HM3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF43A-HM3-08 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-HM3-08?
For technical support, including SMF43A-HM3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF43A-HM3-08 requirements.
6.How does Aetrix verify that SMF43A-HM3-08 is sourced from the original manufacturer or authorized distributors?
All SMF43A-HM3-08 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-HM3-08 meets industry standards.
7.What is the process for return or replacement of SMF43A-HM3-08?
All SMF43A-HM3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF43A-HM3-08, 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-HM3-08 part is unused and in its original packaging.
Return procedure for SMF43A-HM3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF43A-HM3-08 Tags
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