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Vishay General Semiconductor - Diodes Division SMF15A-HM3-18
- Part No.:
- SMF15A-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF15A-HM3-18.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:5,184
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Product details
Overview
SMF15A-HM3-18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in DO-219AB (SOD-123W) package, rated for 15 V standoff voltage, 24.4 V max clamping voltage at 8.2 A peak pulse current, and 200 W peak pulse power (10/1000 μs). It delivers ±30 kV IEC 61000-4-2 ESD immunity and supports automotive-grade reliability per AEC-Q101.
For engineers reviewing the SMF15A-HM3-18 datasheet, SMF15A-HM3-18 pinout, SMF15A-HM3-18 application, or SMF15A-HM3-18 equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, capacitance (367 pF @ 0 V) in high-speed signal lines, thermal resistance (180 K/W), and compatibility with reflow/wave soldering in space-constrained PCB layouts.
Technical Context
This device operates as a transient voltage suppression (TVS) diode in clamping mode, leveraging silicon avalanche breakdown to divert ESD and surge energy away from sensitive downstream circuitry. Its low incremental surge resistance ensures rapid voltage stabilization during transients, while its "Low Noise" technology enables sub-nanosecond response time critical for protecting USB, HDMI, and automotive sensor interfaces.
The SMF15A-HM3-18 is optimized for unidirectional DC rail protection where reverse polarity is not expected. It features a single protection path, 0.1 μA max reverse leakage at 15 V, and junction temperature range of –65 °C to +175 °C - enabling deployment in under-hood automotive modules and industrial control terminals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 15 V - Maximum continuous operating voltage before clamping begins; sets upper limit for protected line's nominal DC bias. |
| Clamping Voltage (VC) | 24.4 V max at 8.2 A (10/1000 μs) - Peak voltage seen by protected IC during worst-case surge; must be below IC's absolute maximum rating. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges without degradation; sufficient for IEC 61000-4-2 Level 4 compliance. |
| Capacitance | 367 pF @ 0 V, 1 MHz - Impacts signal integrity on data lines; suitable for ≤10 Mbps interfaces like CAN or LIN, not high-speed USB 2.0. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest industrial and automotive ESD immunity requirements out-of-box. |
| Package | DO-219AB (SOD-123W) - 3.9 × 1.9 × 1.08 mm low-profile outline compatible with automated SMT assembly and dense PCB layouts. |
| AEC-Q101 Qualified | Yes - Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
Pinout & Package
SMF15A-HM3-18 uses the DO-219AB (SOD-123W) surface-mount package: 3.9 mm length, 1.9 mm width, 1.08 mm height, cathode-bar marked end, MSL level 1, and reflow-compatible tin-plated terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side for protected line | Connected to signal or power line requiring ESD protection; forward-biased during normal operation (low impedance path to ground only during transients). |
| Cathode | Ground reference terminal | Connected to system ground plane; provides low-impedance return path for surge current; marking bar identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive ESD events without parameter drift or failure in automotive infotainment ports. |
| ±30 kV IEC 61000-4-2 ESD immunity | Eliminates need for external ESD test conditioning; passes full 10-pulse contact/air discharge testing per standard. |
| Low clamping voltage (24.4 V) | Provides 5.6 V margin below typical 30 V absolute max rating of 12 V automotive microcontrollers and transceivers. |
| AEC-Q101 qualification | Validates reliability for 15-year automotive service life under thermal cycling, humidity, and mechanical shock conditions. |
| SOD-123W footprint compatibility | Allows drop-in replacement with legacy SOD-123F/SOD-123FL designs without PCB redesign or stencil changes. |
Applications
| Automotive Sensor Interface | Industrial Serial Bus Port |
|---|---|
Use Scenario: Protecting LIN bus transceivers in door module ECUs exposed to cable discharge events during vehicle assembly and service. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between LIN data line and chassis ground to clamp transients before they reach the transceiver's input stage. Use Value: Maintains signal integrity at 19.2 kbps while surviving ±30 kV ESD strikes - preventing latch-up or permanent damage to the LIN PHY. | Use Scenario: Safeguarding RS-485 communication lines in factory automation PLC I/O modules subject to induced lightning surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on differential pair, coordinated with common-mode chokes to suppress fast transients up to 200 W. Use Value: Limits peak voltage to 24.4 V during 10/1000 μs surges, ensuring receiver ICs remain within safe operating area without derating. |
| Consumer USB Type-A Port | Medical Patient Monitor Signal Input |
Use Scenario: ESD protection on VBUS and D+/D– lines of embedded USB host ports in portable diagnostic devices. IC Role / Device Role / Timing Role: Standoff-rated clamping diode on each line, selected for 15 V VRWM to avoid interfering with 5 V USB signaling margins. Use Value: Provides certified ±30 kV contact discharge immunity while adding only 367 pF capacitance - no USB 2.0 timing violations observed. | Use Scenario: Transient suppression on analog front-end inputs (ECG, SpO₂) where low-leakage and biocompatibility are critical. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA @ 15 V) unidirectional TVS placed before instrumentation amplifier to prevent saturation during handling ESD. Use Value: Prevents baseline shift and false alarms during clinical use; qualified to AEC-Q101 for long-term stability in regulated medical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A-E3/5A | DO-214AC (SMA) package; 1.9 mm height vs. SMF15A-HM3-18's 1.08 mm; 25.5 V clamping at 7.9 A; 400 pF capacitance. | Higher profile limits use in ultra-thin consumer enclosures; higher capacitance restricts use on >5 Mbps lines. | Select when board space allows taller components and higher surge margin is prioritized over capacitance or height. |
| TPSMF15A | Same DO-219AB package; 24.4 V clamping; but 200 pF capacitance (vs. 367 pF); AEC-Q101 qualified; RoHS-compliant. | Lower capacitance enables use on faster interfaces (e.g., CAN FD up to 5 Mbps); identical mechanical fit and thermal performance. | Prefer for new designs requiring lower signal loading on high-speed automotive buses without changing layout or thermal management. |
Compared with SMAJ15A-E3/5A and TPSMF15A, SMF15A-HM3-18 offers optimal balance of ultra-low profile, certified automotive qualification, and predictable clamping behavior - making it ideal for space-constrained, thermally demanding, and safety-critical applications where consistent 24.4 V clamping and 367 pF loading are acceptable.
Availability
SMF15A-HM3-18 is available at Aetrix Electronics and suitable for automotive electronics, industrial serial communications, and medical signal conditioning requiring stable component supply across multi-year production cycles.
Supply support for SMF15A-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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets compact, high-surge-capability ESD protection for automotive and industrial applications - designed specifically to meet AEC-Q101 requirements while maintaining low-profile SMT compatibility and precise clamping performance.
FAQ
What is the clamping voltage specification for SMF15A-HM3-18 under standard test conditions?
The SMF15A-HM3-18 has a maximum clamping voltage (VC) of 24.4 V when subjected to an 8.2 A peak pulse current with a 10/1000 μs waveform. This value is measured at the device terminals and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring compatibility with downstream ICs rated for ≤30 V absolute maximum.
Is SMF15A-HM3-18 suitable for bidirectional signal line protection?
No - SMF15A-HM3-18 is a unidirectional TVS diode intended for DC power rail or single-ended signal line protection where reverse voltage polarity is not expected. For bidirectional applications such as USB D+ or RS-485 differential pairs, a bidirectional variant like SMF15CA-HM3-18 would be required instead.
Does SMF15A-HM3-18 require derating at elevated ambient temperatures?
Yes - the peak pulse power rating of SMF15A-HM3-18 decreases above 25 °C ambient due to thermal limitations. At 85 °C, the 200 W (10/1000 μs) rating reduces to approximately 130 W based on the RthJA of 180 K/W and junction temperature limit of 175 °C; design margin must account for this derating in high-temperature environments.
What is the moisture sensitivity level (MSL) for SMF15A-HM3-18, and how does it affect handling?
SMF15A-HM3-18 is rated MSL level 1 per J-STD-020, meaning it has unlimited floor life and may be stored and assembled without dry-pack or baking requirements. This simplifies manufacturing logistics and eliminates moisture-related popcorning risk during reflow soldering - a key advantage for high-volume automotive production.
How does the 367 pF capacitance of SMF15A-HM3-18 impact high-speed data lines?
The 367 pF typical capacitance of SMF15A-HM3-18 at 0 V limits its use to data lines operating at ≤10 Mbps, such as LIN, RS-232, or low-speed CAN. It introduces measurable rise-time degradation on USB 2.0 (480 Mbps) or HDMI lines; for those, lower-capacitance alternatives like TPSMF15A (200 pF) should be evaluated while retaining the same DO-219AB footprint and clamping performance.
SMF15A-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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 8.2A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 367pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF15A-HM3-18 FAQ
1.How can I place an order for SMF15A-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF15A-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 SMF15A-HM3-18 reliable?
The price and inventory of SMF15A-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 SMF15A-HM3-18 is usually 5 days.
3.What payment methods are accepted for SMF15A-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF15A-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF15A-HM3-18?
SMF15A-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF15A-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 SMF15A-HM3-18?
For technical support, including SMF15A-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF15A-HM3-18 requirements.
6.How does Aetrix verify that SMF15A-HM3-18 is sourced from the original manufacturer or authorized distributors?
All SMF15A-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 SMF15A-HM3-18 meets industry standards.
7.What is the process for return or replacement of SMF15A-HM3-18?
All SMF15A-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF15A-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 SMF15A-HM3-18 part is unused and in its original packaging.
Return procedure for SMF15A-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF15A-HM3-18 Tags
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