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Vishay SMF51A-HM3_A18
- Part No.:
- SMF51A-HM3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF51A-HM3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,372
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Product details
Overview
SMF51A-HM3_A18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for high-energy transient suppression in data lines and power rails. 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.
For engineers reviewing the SMF51A-HM3_A18 datasheet, SMF51A-HM3_A18 pinout, SMF51A-HM3_A18 application, or SMF51A-HM3_A18 equivalent, this page delivers verified electrical specs, package dimensions, clamping behavior under surge conditions, and validated alternatives for automotive-grade board-level ESD hardening.
Technical Context
This device operates as a unidirectional avalanche diode with a single protection path. Its low incremental surge resistance enables fast clamping response (<1 ns), and its "Low Noise" technology minimizes signal distortion during ESD events. The junction temperature range spans −65 °C to +175 °C, supporting under-hood automotive deployment.
It complies with IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-5 (1000 W, 8/20 μs), and meets AEC-Q101 stress requirements including H3B-class human body model (>8 kV). Thermal resistance is 180 K/W when mounted on 3 mm × 3 mm Cu pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 51 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 48 V automotive systems. |
| Clamping Voltage (VC) | 82.4 V at IPPM = 2.4 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; ensures downstream ICs remain below absolute max ratings. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains high-energy transients without failure; sufficient for ISO 7637-2 pulse 1/2a in 12 V/24 V vehicle networks. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Fully protects USB, CAN, LIN, and sensor interfaces against real-world electrostatic discharge events. |
| Capacitance | 151 pF at VR = 0 V, f = 1 MHz - Low enough for <10 Mbps data lines (e.g., CAN FD, LIN), but not suitable for high-speed USB 2.0 or HDMI. |
| AEC-Q101 Qualified | Yes - Validated for automotive use per stress test requirements including temperature cycling, HTRB, and ESD robustness. |
| 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_A18 uses the DO-219AB (SMF) package: an asymmetric surface-mount case with cathode band marking. Dimensions are 3.9 mm (L) × 1.9 mm (W) × 1.08 mm (H); footprint requires 2.9 mm × 1.4 mm pad area with 1.3 mm solder mask opening per side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/line side terminal | Connected to signal or power line requiring protection; carries surge current into the diode during overvoltage events. |
| Cathode | Ground/reference terminal | Connected to system ground or low-impedance return path; establishes clamping reference and completes transient current path. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive load dump and inductive switching surges in 24 V commercial vehicle systems. |
| ±30 kV IEC 61000-4-2 ESD rating | Eliminates need for secondary ESD stages on exposed connectors in telematics modules and ADAS camera links. |
| AEC-Q101 qualification | Confirms reliability for 15+ year automotive service life under thermal cycling, humidity, and mechanical vibration stress. |
| Low-profile DO-219AB package | Reduces board space by 30% vs. SMA packages while maintaining thermal performance via optimized copper pad layout. |
| 151 pF capacitance at 0 V | Supports LIN bus (20 kbps) and CAN FD (2 Mbps) without signal integrity degradation or timing skew. |
Applications
| Automotive Infotainment Display Interface | Industrial CAN FD Node Protection |
|---|---|
Use Scenario: ESD protection on LVDS or FPD-Link III video interface cables connecting head unit to TFT display. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between differential pairs and ground to shunt ESD energy before it reaches serializer/deserializer ICs. Use Value: Prevents latch-up or gate oxide damage in display driver ICs during assembly handling or field operation, leveraging 82.4 V clamping to stay within 100 V absolute max rating of typical LVDS receivers. |
Use Scenario: Transient suppression on CAN FD data lines in battery management systems (BMS) operating in high-noise 48 V architectures. IC Role / Device Role / Timing Role: Line-side TVS diode connected anode-to-line, cathode-to-ground, providing fast clamping during ESD or coupled noise events. Use Value: Maintains signal integrity up to 5 Mbps by limiting capacitance to 151 pF and clamping transients within 1.2 ns, preventing bit errors or controller resets. |
| Automotive Sensor Signal Conditioning | Telematics Module Cellular Antenna Feed |
Use Scenario: Protecting analog outputs of pressure or temperature sensors in engine control units exposed to under-hood ESD. IC Role / Device Role / Timing Role: Standoff-mode protector on 0–5 V analog output lines, conducting only during overvoltage events above 51 V. Use Value: Ensures sensor accuracy remains unaffected during normal operation (IR < 0.1 μA at VRWM), while clamping 2.4 A surges to ≤82.4 V to safeguard ADC front-end. |
Use Scenario: Secondary ESD protection on LTE/5G antenna feed lines entering cellular modems in vehicle tracking units. IC Role / Device Role / Timing Role: Ground-referenced unidirectional clamp placed after DC blocking capacitor to absorb static discharge before RF front-end LNA. Use Value: Provides ±30 kV contact discharge immunity without degrading RF insertion loss, thanks to low parasitic inductance inherent in DO-219AB package geometry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SP1003-01WTG | Bi-directional, 5 V working voltage, 12 pF capacitance, 30 kV ESD rating | Better suited for high-speed USB 2.0 or HDMI; not rated for >40 V systems | Select when protecting low-voltage, high-frequency signals where capacitance must be <15 pF. |
| ON Semiconductor SZ1.5SMC51A | Higher power (1500 W, 8/20 μs), DO-214AB package (larger, 7.1 mm × 6.2 mm), 51 V VRWM | Used in primary power rail protection (e.g., 48 V input stage), not signal line due to size and capacitance (250 pF) | Choose for bulk power line clamping where board space allows larger footprint and higher surge energy absorption is required. |
Compared with SP1003-01WTG and SZ1.5SMC51A, SMF51A-HM3_A18 uniquely balances 51 V standoff, compact DO-219AB size, and 151 pF capacitance-making it optimal for space-constrained automotive signal lines needing AEC-Q101 validation and precise clamping in the 48–60 V range.
Availability
SMF51A-HM3_A18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial CAN FD nodes, and telematics module designs requiring stable component supply across extended production lifecycles.
Supply support for SMF51A-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, passive elements, and sensors, with leadership in power management and circuit protection technologies.
The SMF series is part of Vishay's eSMP® family, engineered specifically for high-reliability board-level ESD and surge protection in automotive, industrial, and communications equipment where AEC-Q101 compliance and low-profile packaging are mandatory.
FAQ
What is the maximum clamping voltage of SMF51A-HM3_A18 under standard surge conditions?
The SMF51A-HM3_A18 has a maximum clamping voltage (VC) of 82.4 V when subjected to a 2.4 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and ensures protected circuits remain within safe operating limits during transient events. The clamping performance is guaranteed across the full operating temperature range of −65 °C to +175 °C.
Is SMF51A-HM3_A18 suitable for bidirectional signal lines like USB or RS-485?
No, SMF51A-HM3_A18 is a unidirectional ESD protection diode and is not appropriate for bidirectional data lines. Its design supports only anode-to-line, cathode-to-ground configuration. For USB, RS-485, or other bidirectional interfaces, a symmetric bi-directional TVS such as the SMF5.0AT or SP1003-01WTG should be selected instead. Using SMF51A-HM3_A18 on bidirectional lines risks forward conduction during normal signal swings.
Does SMF51A-HM3_A18 meet automotive qualification standards?
Yes, SMF51A-HM3_A18 is AEC-Q101 qualified, having passed all required stress tests including HTGB, HTRB, temperature cycling, and ESD robustness per human body model (H3B, >8 kV). This qualification confirms suitability for automotive applications including engine control, body electronics, and ADAS subsystems where long-term reliability under harsh environmental conditions is critical.
What is the thermal resistance (RthJA) of SMF51A-HM3_A18 on a standard PCB layout?
The junction-to-ambient thermal resistance (RthJA) of SMF51A-HM3_A18 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 J-STD-020 MSL level 1 reflow conditions and is essential for calculating junction temperature rise during sustained surge events or elevated ambient operation in automotive under-hood environments.
Can SMF51A-HM3_A18 be used in place of SMF51A-E3-08?
Yes, SMF51A-HM3_A18 and SMF51A-E3-08 share identical electrical specifications, DO-219AB package, and AEC-Q101 qualification. The difference lies only in packaging format: HM3_A18 denotes 10k per 13″ reel with moisture-sensitive level 1 handling, while E3-08 indicates 3k per 7″ reel. Both are fully interchangeable electrically and mechanically in circuit design and layout.
SMF51A-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):
- 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF51A-HM3_A18 FAQ
1.How can I place an order for SMF51A-HM3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF51A-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 SMF51A-HM3_A18 reliable?
The price and inventory of SMF51A-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 SMF51A-HM3_A18 is usually 5 days.
3.What payment methods are accepted for SMF51A-HM3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF51A-HM3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF51A-HM3_A18?
SMF51A-HM3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF51A-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 SMF51A-HM3_A18?
For technical support, including SMF51A-HM3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF51A-HM3_A18 requirements.
6.How does Aetrix verify that SMF51A-HM3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF51A-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 SMF51A-HM3_A18 meets industry standards.
7.What is the process for return or replacement of SMF51A-HM3_A18?
All SMF51A-HM3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF51A-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 SMF51A-HM3_A18 part is unused and in its original packaging.
Return procedure for SMF51A-HM3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF51A-HM3_A18 Tags
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