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Vishay General Semiconductor - Diodes Division SMF51A-HM3-18
- Part No.:
- SMF51A-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF51A-HM3-18.pdf
- Description:
- TVS DIODE 51VWM 82.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:4,866
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Product details
Overview
SMF51A-HM3-18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for high-speed data line and power rail transient suppression. It features a 51 V standoff voltage (VRWM), 82.4 V maximum clamping voltage at 2.4 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 and industrial sensor signal conditioning.
For engineers reviewing the SMF51A-HM3-18 datasheet, SMF51A-HM3-18 pinout, SMF51A-HM3-18 application, or SMF51A-HM3-18 equivalent, this page delivers verified electrical parameters, package dimensions, clamping behavior under surge conditions, AEC-Q101 qualification status, and direct alternatives for automotive-grade ESD protection design-in.
Technical Context
The SMF51A-HM3-18 operates as a unidirectional avalanche diode with a single protection path, leveraging silicon planar technology to achieve fast response time (<1 ns) and low incremental surge resistance. Its junction temperature range spans −65 °C to +175 °C, supporting under-hood automotive environments.
It complies with IEC 61000-4-2 (±30 kV contact/air discharge) and IEC 61000-4-5 (1000 W, 8/20 μs), while maintaining 151 pF typical capacitance at 0 V - optimized for USB 2.0 and CAN FD signal lines where low parasitic loading is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 51 V - defines maximum continuous reverse operating voltage before leakage exceeds 0.1 μA; sets safe margin below system rail voltage. |
| Clamping Voltage (VC) | 82.4 V at IPPM = 2.4 A (10/1000 μs) - limits transient voltage seen by downstream ICs during ESD or surge events. |
| Peak Pulse Power | 200 W (10/1000 μs) - sustains short-duration transients without thermal failure; supports IEC 61000-4-5 Level 3 compliance. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - meets highest industrial and automotive ESD stress requirements without degradation. |
| Capacitance (CD) | 151 pF at VR = 0 V, f = 1 MHz - low enough for <480 Mbps USB 2.0 signaling integrity; avoids signal rise-time distortion. |
| AEC-Q101 Qualified | Yes - validated for automotive applications including engine control modules and body electronics per stress test requirements. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 mm × 1.9 mm × 1.08 mm low-profile outline enabling dense PCB layouts and automated reflow assembly. |
Pinout & Package
SMF51A-HM3-18 uses the DO-219AB (SMF) package: cathode-marked surface-mount case with two terminals. The package is compatible with SOD-123W footprint and supports wave/reflow soldering per J-STD-020 MSL level 1 (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/line side terminal | Connected to protected signal or power line; conducts during forward-biased surges (e.g., negative transients on ground-referenced lines). |
| Cathode | Output/load side terminal | Connected to system ground or low-impedance return path; provides low-impedance shunt during reverse-biased ESD events (e.g., positive transients). |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping voltage with low dynamic impedance | 82.4 V clamping at 2.4 A ensures downstream ICs remain within absolute maximum ratings during 10/1000 μs surges. |
| Ultra-low leakage current | 0.1 μA max at VRWM = 51 V minimizes standby power loss in battery-powered automotive sensors. |
| Fast response time | <1 ns turn-on enables effective suppression of sub-nanosecond ESD pulses before IC damage occurs. |
| AEC-Q101 qualification | Validated for temperature cycling, HTRB, and ESD robustness - required for automotive front-end interface protection. |
| RoHS-compliant, lead-free terminations | Tin-plated terminals meet JEDEC J-STD-020 reflow profile and eliminate Pb-based solder compatibility concerns. |
Applications
| Automotive Infotainment Display Interface | Industrial CAN FD Bus Node |
|---|---|
Use Scenario: Protecting LVDS or FPD-Link III video data lines between head unit and TFT display against ESD from user touch and harness coupling. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed inline between connector and serializer/deserializer IC. Use Value: 151 pF capacitance preserves signal integrity up to 3 Gbps; ±30 kV ESD rating prevents display flicker or lockup during service handling. |
Use Scenario: Shielding CAN FD transceivers from load dump-induced transients and ESD in factory automation PLC nodes. IC Role / Device Role / Timing Role: Primary ESD clamp on CANH/CANL differential pair, referenced to chassis ground. Use Value: 82.4 V clamping prevents transceiver latch-up during ISO 16750-2 pulse 5a; AEC-Q101 qualification ensures reliability over 15-year vehicle life. |
| USB 2.0 Port in Telematics Module | Power Supply Rail Protection in ADAS Camera |
Use Scenario: Safeguarding USB D+/D− lines in cellular-connected telematics units exposed to hot-plug and static discharge. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (cathode grounded) suppressing both positive and negative transients on data lines. Use Value: Low 151 pF capacitance maintains USB 2.0 eye diagram compliance; 200 W pulse rating handles multiple ESD strikes without parametric shift. |
Use Scenario: Clamping 12 V supply rail transients induced by solenoid switching or ignition noise in surround-view camera ECUs. IC Role / Device Role / Timing Role: Standoff-rated TVS on main input rail, placed upstream of DC/DC converter input capacitor. Use Value: 51 V VRWM allows use with 48 V nominal systems via derating; 175 °C max junction temperature supports sealed camera housing operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SP1003-050 | 5.0 V VRWM, 15 pF, 30 kV ESD - lower voltage, much lower capacitance. | Targeted at low-voltage logic (3.3 V/5 V), not 12–48 V power/signal rails. | Select only for sub-6 V interfaces; not suitable for SMF51A-HM3-18's 51 V operating zone. |
| Bourns CDSOD323-T51 | 51 V VRWM, 160 pF, SOD-323 package - same standoff, higher capacitance, smaller footprint. | Higher parasitic capacitance may degrade >200 Mbps signal integrity; limited power handling (150 W). | Acceptable for space-constrained 51 V designs where 200 W pulse rating is not required. |
Compared with SMF51A-HM3-18, SP1003-050 serves low-voltage logic but cannot protect 12–48 V rails, while CDSOD323-T51 trades pulse power and thermal robustness for board area - making SMF51A-HM3-18 optimal for automotive power-line ESD hardening where reliability trumps miniaturization.
Availability
SMF51A-HM3-18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial CAN FD networks, and ADAS camera power supplies requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SMF51A-HM3-18 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, and passive components for automotive, industrial, and computing markets.
The SMF series targets high-energy ESD and surge protection in harsh environments, with design focus on AEC-Q101 qualification, low clamping, and robust thermal performance for under-hood and factory-floor deployment.
FAQ
What is the maximum clamping voltage of the SMF51A-HM3-18 under standard surge conditions?
The SMF51A-HM3-18 has a maximum clamping voltage (VC) of 82.4 V when subjected to a 10/1000 μs waveform at 2.4 A peak pulse current. This value is measured per IEC 61000-4-5 and ensures protected circuitry remains within safe voltage limits during transient events. The clamping performance is guaranteed across the full operating temperature range of −65 °C to +175 °C.
Is SMF51A-HM3-18 suitable for automotive applications requiring AEC-Q101 qualification?
Yes, SMF51A-HM3-18 is AEC-Q101 qualified and tested for temperature cycling, highly accelerated life testing (HALT), and ESD robustness per automotive stress requirements. Its 175 °C maximum junction temperature and ±30 kV IEC 61000-4-2 rating make it appropriate for engine control units, body controllers, and ADAS modules where long-term reliability is mandatory. SMF51A-HM3-18 meets all applicable AEC-Q101 test conditions without derating.
What package type does SMF51A-HM3-18 use, and is it compatible with standard SMT processes?
SMF51A-HM3-18 uses the DO-219AB (SMF) package - a low-profile surface-mount outline measuring 3.9 mm × 1.9 mm × 1.08 mm. It is fully compatible with standard reflow soldering per J-STD-020 MSL level 1 (peak 260 °C) and wave soldering. The cathode-bar marking and tape-and-reel packaging (18 mm tape, 3K per 7″ reel) support automated pick-and-place and high-yield assembly. SMF51A-HM3-18 footprint aligns with SOD-123W land patterns.
How does the 151 pF capacitance of SMF51A-HM3-18 affect high-speed signal lines like USB 2.0?
The 151 pF typical capacitance of SMF51A-HM3-18 at 0 V is carefully balanced to provide robust ESD protection without compromising USB 2.0 signal integrity. At 480 Mbps, this capacitance introduces minimal rise-time degradation and maintains eye diagram compliance when placed with short trace lengths. Designers should route protected lines differentially and minimize stub length to preserve impedance matching - SMF51A-HM3-18 enables reliable USB 2.0 port hardening in telematics and infotainment systems.
What is the standoff voltage (VRWM) and why is it critical for SMF51A-HM3-18 selection?
The standoff voltage (VRWM) of SMF51A-HM3-18 is 51 V - the maximum continuous reverse voltage it can block without exceeding 0.1 μA leakage current. This parameter is critical because it must exceed the normal operating voltage of the protected line (e.g., 42 V max in 36 V automotive systems) while leaving sufficient margin for ripple and transients. Selecting a VRWM too close to system voltage risks premature conduction and increased power loss; SMF51A-HM3-18's 51 V rating provides safe derating for 12 V, 24 V, and 48 V architectures.
SMF51A-HM3-18 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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 2.4A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 151pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF51A-HM3-18 FAQ
1.How can I place an order for SMF51A-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF51A-HM3-18 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 SMF51A-HM3-18 reliable?
The price and inventory of SMF51A-HM3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF51A-HM3-18 is usually 5 days.
3.What payment methods are accepted for SMF51A-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF51A-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF51A-HM3-18?
SMF51A-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF51A-HM3-18 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 SMF51A-HM3-18?
For technical support, including SMF51A-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF51A-HM3-18 requirements.
6.How does Aetrix verify that SMF51A-HM3-18 is sourced from the original manufacturer or authorized distributors?
All SMF51A-HM3-18 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 SMF51A-HM3-18 meets industry standards.
7.What is the process for return or replacement of SMF51A-HM3-18?
All SMF51A-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF51A-HM3-18, 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 SMF51A-HM3-18 part is unused and in its original packaging.
Return procedure for SMF51A-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF51A-HM3-18 Tags
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