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Vishay General Semiconductor - Diodes Division SMBJ14AHM3_B/I
- Part No.:
- SMBJ14AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14AHM3_B/I.pdf
- Description:
- 600W,14V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,706
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Product details
Overview
SMBJ14AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 14 V stand-off voltage (VWM), 15.6–17.2 V breakdown voltage (VBR) at 1 mA, 23.2 V maximum clamping voltage (VC) at 25.9 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in industrial motor drives and automotive ECUs.
For engineers reviewing the SMBJ14AHM3_B/I datasheet, SMBJ14AHM3_B/I pinout, SMBJ14AHM3_B/I application, or SMBJ14AHM3_B/I equivalent, this page delivers verified electrical parameters, thermal derating behavior, AEC-Q101 qualification status, and direct replacement guidance for ESD/surge protection design in harsh environments.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its 100 °C/W junction-to-ambient thermal resistance requires minimum 5.0 mm × 5.0 mm copper pad layout per terminal for rated 600 W pulse handling.
The SMBJ14AHM3_B/I is halogen-free, RoHS-compliant, and AEC-Q101 qualified (HM3 suffix), supporting automotive-grade reliability under -55 °C to +150 °C operating junction temperature. It exhibits 0.087 %/°C temperature coefficient of VBR, enabling stable clamping across wide thermal ranges in engine control modules and battery management systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin above system nominal rail (e.g., 12 V automotive). |
| VBR @ IT = 1 mA | 15.6–17.2 V - Breakdown voltage range confirming reliable turn-on threshold; ensures consistent clamping onset across production lots. |
| VC @ IPPM = 25.9 A | 23.2 V - Clamped voltage during 600 W transient; limits downstream IC stress to safe levels during ISO 7637-2 pulse 1/2a events. |
| PPPM | 600 W - Peak pulse power with 10/1000 µs waveform; supports single-event surge immunity up to 25.9 A without degradation. |
| IFSM | 100 A - Non-repetitive forward surge current (8.3 ms half-sine); enables survival of high-energy load dump transients in vehicle power networks. |
| TJ max. | +150 °C - Maximum junction temperature; allows operation in under-hood environments with minimal thermal derating. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow soldering (MSL Level 1, 260 °C peak). |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode identified by band marking on one end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for full power rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side connection | Connected to ground or low-impedance return path; carries surge current during clamping event. |
| Cathode | Reverse-biased terminal / protected line connection | Connected to protected signal/power line; reverse voltage applied here triggers avalanche breakdown when VWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors under stress conditions per JESD22-A108. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-020 MSL Level 1 requirements; suitable for lead-free reflow assembly without delamination risk. |
| 600 W peak pulse power | Handles ISO 16750-2 load dump surges and IEC 61000-4-5 combination wave transients without failure or parameter shift. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during fast transients, protecting 16 V-rated MOSFET gates and microcontroller I/O pins. |
| Fast response time (< 1 ns) | Clamps before transient energy couples into downstream circuitry; critical for safeguarding high-speed CAN/LIN bus interfaces. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Control |
|---|---|
|
Use Scenario: Suppresses load dump transients (up to 120 V, 400 ms) on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp overvoltage before regulator stage. Use Value: Limits peak voltage to 23.2 V during 25.9 A surge, preventing damage to 36 V-input buck controllers and ensuring uninterrupted MCU operation. |
Use Scenario: Protects gate drivers and current-sense amplifiers from inductive kickback in 24 V PLC-controlled motor starters. IC Role / Device Role / Timing Role: Mounted across H-bridge half-bridge outputs to absorb flyback energy during MOSFET turn-off. Use Value: Clamps 600 W spikes within nanoseconds, reducing gate oxide stress and eliminating false triggering of overcurrent protection circuits. |
| Telecom Power Supply Input | Consumer Sensor Interface Protection |
|
Use Scenario: Guards AC/DC adapter outputs against lightning-induced surges entering telecom base station power inputs. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side 48 V output, upstream of POL converters and FPGA power domains. Use Value: Withstands 10/1000 µs 6 kV surge tests per IEC 61000-4-5, maintaining VC ≤ 23.2 V to prevent brownout resets in Ethernet PHYs. |
Use Scenario: Shields I²C and analog sensor lines (e.g., temperature, pressure) in smart home hubs from ESD events during user interaction. IC Role / Device Role / Timing Role: Placed inline on SDA/SCL traces with series resistance to limit current into microcontroller ESD diodes. Use Value: Responds in <1 ns to ±8 kV contact discharge (IEC 61000-4-2), clamping to 23.2 V and preserving signal integrity below 100 kHz bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14AHE3_B/I | Same electrical specs but RoHS-compliant (E3) instead of halogen-free (HM3); no AEC-Q101 qualification. | Restricted to commercial-grade industrial and consumer equipment; not approved for automotive under-hood use. | Select when AEC-Q101 is unnecessary and cost sensitivity favors standard RoHS compliance over halogen-free materials. |
| SMAJ14A-HF | Lower 400 W PPPM, SMA package (smaller footprint), 27.7 V VC at 14.3 A - higher clamping voltage and reduced surge margin. | Limited to lower-energy transients (e.g., board-level ESD); unsuitable for load dump or lightning surge scenarios. | Choose only for space-constrained PCBs where 600 W capability is not required and clamping voltage margin ≥ 13.7 V is acceptable. |
Compared with SMBJ14AHM3_B/I, SMBJ14AHE3_B/I offers identical protection performance without halogen-free assurance or automotive qualification, while SMAJ14A-HF trades 33 % lower surge capacity and higher clamping for 30 % smaller board area - making SMBJ14AHM3_B/I the sole choice for AEC-Q101-compliant 600 W clamping in constrained thermal environments.
Availability
SMBJ14AHM3_B/I is available at Aetrix Electronics and suitable for automotive ECU designs, industrial motor drive gate protection, and telecom power supply surge hardening requiring stable component supply across multi-year production cycles.
Supply support for SMBJ14AHM3_B/I 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 General Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMBJ series targets ruggedized transient suppression in harsh environments, with HM3 variants engineered specifically for halogen-free, AEC-Q101-compliant automotive power systems demanding long-term stability and zero material compliance risk.
FAQ
What is the clamping voltage of SMBJ14AHM3_B/I at its rated peak pulse current?
The SMBJ14AHM3_B/I has a maximum clamping voltage (VC) of 23.2 V at 25.9 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SMBJ14AHM3_B/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) with minimal drift due to its 0.087 %/°C VBR coefficient.
Is SMBJ14AHM3_B/I suitable for automotive applications?
Yes, SMBJ14AHM3_B/I is AEC-Q101 qualified and designated for automotive use, as confirmed by its HM3 suffix and inclusion in Vishay's AEC-Q101-compliant product list. It meets stress test requirements for temperature cycling, humidity bias, and mechanical shock applicable to engine control units and body electronics. The SMBJ14AHM3_B/I is explicitly rated for operation from -55 °C to +150 °C junction temperature and supports load dump immunity per ISO 7637-2 Pulse 5a, making it appropriate for under-hood deployment.
What does the "HM3_B/I" suffix indicate in SMBJ14AHM3_B/I?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification; "B" indicates revision level B per Vishay's internal change control; and "I" specifies packaging in 13-inch tape-and-reel format with 3200 units per reel. This full ordering code distinguishes SMBJ14AHM3_B/I from non-automotive variants like SMBJ14A-E3/5B and confirms compliance with automotive material and reliability standards - a critical differentiator when selecting SMBJ14AHM3_B/I for Tier 1 supplier BOMs.
How does SMBJ14AHM3_B/I compare to bidirectional TVS diodes like SMBJ14CA?
SMBJ14AHM3_B/I is unidirectional and intended for DC rail protection where polarity is fixed (e.g., 12 V battery input), offering lower leakage and tighter VBR tolerance than bidirectional types. In contrast, SMBJ14CA provides symmetrical clamping for AC-coupled or floating signal lines but exhibits doubled ID at VWM and lacks cathode marking. For applications requiring polarity-aware clamping with minimal standby loss - such as automotive power distribution - SMBJ14AHM3_B/I delivers superior efficiency and predictable turn-on behavior.
What PCB layout guidelines apply to SMBJ14AHM3_B/I for full 600 W rating?
To achieve the full 600 W peak pulse power rating, SMBJ14AHM3_B/I must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay document 88392 Figure 4. Trace width should exceed 1.5 mm, and thermal vias (≥4× 0.3 mm diameter) are recommended beneath each pad to enhance heat dissipation. Deviation from this layout reduces IPPM capability proportionally - e.g., using 1.0 mm² copper area cuts rated surge current by ~40 %. These constraints directly impact SMBJ14AHM3_B/I performance in high-reliability power systems.
SMBJ14AHM3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 25.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ14AHM3_B/I FAQ
1.How can I place an order for SMBJ14AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14AHM3_B/I 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 SMBJ14AHM3_B/I reliable?
The price and inventory of SMBJ14AHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ14AHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ14AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14AHM3_B/I?
SMBJ14AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14AHM3_B/I 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 SMBJ14AHM3_B/I?
For technical support, including SMBJ14AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ14AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ14AHM3_B/I 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 SMBJ14AHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ14AHM3_B/I?
All SMBJ14AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14AHM3_B/I, 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 SMBJ14AHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ14AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ14AHM3_B/I Tags
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