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Vishay SMF33A-HM3_A18
- Part No.:
- SMF33A-HM3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF33A-HM3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,180
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Product details
Overview
SMF33A-HM3_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 and power rails. It features a 33 V stand-off voltage (VRWM), 53.3 A peak pulse current (IPPM) at 10/1000 μs, 53.3 V maximum clamping voltage (VC), ±30 kV IEC 61000-4-2 ESD immunity, and 198 pF typical capacitance at 0 V - deployed in automotive infotainment interfaces and USB 2.0 ports.
For engineers reviewing the SMF33A-HM3_A18 datasheet, SMF33A-HM3_A18 pinout, SMF33A-HM3_A18 application, or SMF33A-HM3_A18 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, SOD-123W-compatible packaging, clamping performance under 50 A surge, and real-world use cases in CAN FD and HDMI ESD protection circuits.
Technical Context
This device operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, optimized for low-capacitance, fast-response transient suppression. Its junction temperature range spans –65 °C to +175 °C, and it achieves thermal resistance of 180 K/W when mounted on 3 mm × 3 mm Cu pads - enabling robust operation in under-hood automotive modules and industrial PLC I/O stages.
The SMF33A-HM3_A18 uses "Low Noise" silicon technology for sub-nanosecond response time and maintains stable clamping down to 0.1 μA leakage at VRWM. It complies with IEC 61000-4-5 (8/20 μs, 1000 W) and AEC-Q101 Class H3B (>8 kV HBM), confirming suitability for harsh-environment electronics requiring repeatable surge resilience without signal distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 33 V - maximum continuous reverse operating voltage before conduction begins; sets safe margin above 24 V nominal bus systems. |
| Clamping Voltage (VC) | 53.3 V max at IPPM = 3.8 A - limits downstream IC voltage stress during 10/1000 μs transients, protecting 3.3 V/5 V logic interfaces. |
| Peak Pulse Current (IPPM) | 3.8 A at 10/1000 μs - defines surge-handling capacity for EFT and lightning-induced surges per IEC 61000-4-4/5. |
| Capacitance (CD) | 198 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and CAN FD (5 Mbps) signal integrity, avoiding data jitter. |
| ESD Rating | ±30 kV contact & air discharge per IEC 61000-4-2 - exceeds Level 4 immunity requirements for consumer and automotive touch surfaces. |
| Operating Temp Range | –65 °C to +175 °C - supports deployment in engine control units, battery management systems, and outdoor telecom equipment. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, mechanical shock, and HBM ESD stress. |
Pinout & Package
SMF33A-HM3_A18 is housed in the DO-219AB (SMF) package - a low-profile, surface-mount case compatible with SOD-123W footprint, measuring 3.9 mm × 1.9 mm × 1.08 mm with cathode-bar marking. The device has two terminals: anode and cathode, with polarity critical for correct unidirectional clamping orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected signal line or power rail; conducts during reverse-biased overvoltage events. |
| Cathode | Ground-reference terminal | Connected to system ground or low-impedance return path; establishes clamping reference and enables fast avalanche turn-on. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W Peak Pulse Power (10/1000 μs) | Enables reliable protection against repetitive EFT bursts in industrial fieldbus nodes without thermal runaway. |
| Low Incremental Surge Resistance | Minimizes voltage overshoot during fast transients, improving clamping precision for sensitive analog front-ends. |
| "Low Noise" Fast Response Technology | Sub-1 ns switching ensures minimal disruption to high-speed digital signals like LVDS and MIPI D-PHY. |
| Soldering Compatibility | Wave and reflow process-ready per J-STD-020 MSL level 1, supporting automated PCB assembly without moisture sensitivity concerns. |
| UL 94 V-0 Mold Compound | Provides flame-retardant housing essential for automotive cabin modules and safety-critical embedded controllers. |
Applications
| Automotive Infotainment Display Interface | Industrial Ethernet PHY Protection |
|---|---|
Use Scenario: ESD strikes on HDMI or LVDS video cables connected to head-unit displays in vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between differential signal pair and chassis ground to clamp transients before reaching SerDes receiver inputs. Use Value: 198 pF capacitance avoids skew between TMDS clock/data pairs; ±30 kV ESD rating prevents display flicker or blackouts during service technician handling. | Use Scenario: Lightning-induced surges coupling onto 100BASE-TX Ethernet lines in factory automation gateways. IC Role / Device Role / Timing Role: Primary-level TVS on MDI pins upstream of magnetics and PHY IC, absorbing common-mode transients before isolation barrier. Use Value: 53.3 V clamping holds PHY supply rail below absolute maximum ratings; 175 °C junction rating sustains operation near hot switch-mode power supplies. |
| USB 2.0 Port Protection | CAN FD Bus Node Protection |
Use Scenario: Hot-plug ESD events on USB connectors in medical handheld devices or test equipment. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (cathode to VBUS, anode to D+/D−) suppressing both positive and negative transients on data lines. Use Value: 198 pF capacitance preserves signal rise/fall times for 480 Mbps signaling; 33 V VRWM allows direct placement on 5 V VBUS without leakage issues. | Use Scenario: ESD discharges on vehicle CAN FD wiring harnesses during assembly or maintenance. IC Role / Device Role / Timing Role: Point-of-entry TVS on CANH/CANL lines before common-mode choke, referenced to battery ground. Use Value: 53.3 V clamping stays within ISO 11898-2 fault voltage limits; AEC-Q101 qualification ensures longevity across 15-year vehicle lifecycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5A (Vishay) | DO-214AC (SMA) package; higher 1000 W 8/20 μs rating but 3× larger footprint and 250 pF capacitance. | Better for high-energy AC-line surges; unsuitable for space-constrained USB or HDMI layouts. | Select SMAJ33A-E3/5A only when board area permits and 8/20 μs IEC 61000-4-5 compliance is mandatory over compactness. |
| TPD2E001DRYR (TI) | 0.65 mm × 0.65 mm DRY package; dual-channel; 12 pF capacitance but only 3 A IPPM and no AEC-Q101 rating. | Optimized for ultra-high-speed mobile interfaces (e.g., USB-C CC lines); not rated for automotive under-hood environments. | Choose TPD2E001DRYR for portable electronics where size and speed outweigh ruggedness; avoid in automotive or industrial settings requiring AEC-Q101. |
Compared with SMAJ33A-E3/5A and TPD2E001DRYR, SMF33A-HM3_A18 uniquely balances AEC-Q101 qualification, 198 pF low capacitance, and DO-219AB compactness - making it the preferred choice for automotive infotainment and industrial Ethernet where space, reliability, and signal fidelity are jointly constrained.
Availability
SMF33A-HM3_A18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial Ethernet gateways, and USB 2.0 peripheral designs requiring stable component supply across multi-year production cycles.
Supply support for SMF33A-HM3_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 power management, signal conditioning, and protection technologies.
The SMF series belongs to Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for high-reliability ESD and surge protection in automotive, industrial, and communications infrastructure applications.
FAQ
What is the clamping voltage of SMF33A-HM3_A18 at its rated peak pulse current?
The SMF33A-HM3_A18 has a maximum reverse clamping voltage (VC) of 53.3 V at IPPM = 3.8 A with a 10/1000 μs waveform. This value is measured under standardized surge conditions and ensures protected downstream ICs remain within their absolute maximum voltage ratings during transient events. The clamping performance is guaranteed across the full operating temperature range of –65 °C to +175 °C.
Is SMF33A-HM3_A18 qualified to AEC-Q101 for automotive use?
Yes, SMF33A-HM3_A18 is AEC-Q101 qualified and rated for Class H3B human body model ESD (>8 kV). It undergoes full stress testing including temperature cycling, mechanical shock, and high-temperature operating life - validating its suitability for under-hood and cabin-mounted automotive electronics. The qualification applies directly to the SMF33A-HM3_A18 part number as shipped in the DO-219AB package.
What is the capacitance of SMF33A-HM3_A18 and how does it affect high-speed signal lines?
SMF33A-HM3_A18 exhibits 198 pF typical capacitance at 0 V and 1 MHz. This low value minimizes signal degradation on interfaces such as USB 2.0 (480 Mbps) and CAN FD (5 Mbps), preserving edge rates and reducing bit error rates. Unlike higher-capacitance alternatives, it avoids excessive loading that could cause timing violations or reflection-induced jitter in differential pairs.
Does SMF33A-HM3_A18 support automated PCB assembly processes?
Yes, SMF33A-HM3_A18 is fully compatible with both wave and reflow soldering per J-STD-020. Its DO-219AB package carries MSL level 1 rating, meaning it can be stored indefinitely at ambient conditions without baking. The device withstands peak reflow temperatures up to 260 °C and is optimized for standard 8 mm tape-and-reel handling (10K per 13″ reel, code _A18).
How does the SMF33A-HM3_A18 package compare to SOD-123W?
SMF33A-HM3_A18 uses the DO-219AB (SMF) package, which is dimensionally and footprint-compatible with SOD-123W per Vishay's documentation. Both share identical 3.9 mm × 1.9 mm outline and cathode-bar polarity marking, enabling drop-in replacement in existing layouts. However, SMF offers lower profile (1.08 mm height vs. ~1.2 mm for SOD-123W) and improved thermal resistance (180 K/W vs. ~200 K/W).
SMF33A-HM3_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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 3.8A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 198pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF33A-HM3_A18 FAQ
1.How can I place an order for SMF33A-HM3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF33A-HM3_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 SMF33A-HM3_A18 reliable?
The price and inventory of SMF33A-HM3_A18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF33A-HM3_A18 is usually 5 days.
3.What payment methods are accepted for SMF33A-HM3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF33A-HM3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF33A-HM3_A18?
SMF33A-HM3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF33A-HM3_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 SMF33A-HM3_A18?
For technical support, including SMF33A-HM3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF33A-HM3_A18 requirements.
6.How does Aetrix verify that SMF33A-HM3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF33A-HM3_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 SMF33A-HM3_A18 meets industry standards.
7.What is the process for return or replacement of SMF33A-HM3_A18?
All SMF33A-HM3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF33A-HM3_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 SMF33A-HM3_A18 part is unused and in its original packaging.
Return procedure for SMF33A-HM3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF33A-HM3_A18 Tags
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