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Vishay General Semiconductor - Diodes Division SMBJ14CAHM3/I
- Part No.:
- SMBJ14CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14CAHM3/I.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,170
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Product details
Overview
SMBJ14CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. 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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform), used in industrial sensor interface protection.
For engineers reviewing the SMBJ14CAHM3/I datasheet, SMBJ14CAHM3/I pinout, SMBJ14CAHM3/I application, or SMBJ14CAHM3/I equivalent, this device is selected for robust ESD and surge immunity in bidirectional data lines, automotive body electronics, and I/O port protection where low clamping voltage and AEC-Q101 qualification are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the low incremental surge resistance enables tight clamping under high-current transients.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 (260 °C peak reflow). The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - critical for automotive-grade reliability in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working range for protected circuit. |
| VBR min/max | 15.6 V / 17.2 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 23.2 V at 25.9 A - Clamped voltage during 10/1000 µs surge; limits stress on downstream ICs like microcontrollers or transceivers. |
| PPPM | 600 W - Peak transient energy handling capacity; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge compliance. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at stand-off voltage; minimizes standby power loss and avoids false triggering. |
| TJ max | +150 °C - Maximum junction temperature rating; enables operation in under-hood automotive or industrial enclosures. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Surge current path terminal | Both terminals function identically; conducts transient current in either direction when voltage exceeds VBR magnitude. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., RS-485, CAN, USB D+/D−) without polarity concerns. |
| AEC-Q101 qualified (HM3) | Validated for automotive applications including body control modules and infotainment interfaces requiring long-term reliability under thermal cycling. |
| 600 W peak pulse power (10/1000 µs) | Withstands repetitive lightning-induced surges per IEC 61000-4-5; supports system-level EMC certification without external derating. |
| Low clamping ratio (VC/VBR ≈ 1.43) | Minimizes voltage overshoot during fast transients; protects 3.3 V and 5 V logic rails with margin below absolute maximum ratings. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance requirements for global OEMs and industrial equipment sold in EU, China, and Japan markets. |
Applications
| Automotive Body Electronics | Industrial Sensor Interfaces |
|---|---|
|
Use Scenario: Protecting LIN bus nodes and door module switches from load dump and inductive kickback in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across LIN signal line to clamp ±30 V transients within 1 ns response time. Use Value: Prevents latch-up or permanent damage to LIN transceivers (e.g., TLE6250) during battery disconnection events. |
Use Scenario: Shielding analog output lines (4–20 mA) of pressure/temperature sensors from EFT bursts in factory automation PLCs. IC Role / Device Role / Timing Role: Standoff protection element between sensor output and ADC input stage, operating continuously at 14 V DC bias. Use Value: Maintains signal integrity by limiting transient excursions to ≤23.2 V, preserving 16-bit measurement accuracy. |
| USB Port ESD Protection | DC Power Rail Surge Suppression |
|
Use Scenario: Secondary-level ESD protection on USB 2.0 D+ and D− lines after primary polymer TVS, in portable medical devices. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp absorbing ±8 kV contact discharge per IEC 61000-4-2. Use Value: Reduces post-ESD recovery time by limiting voltage overshoot below 24 V, avoiding USB PHY reset conditions. |
Use Scenario: Input-side surge suppression on 12 V DC power inputs of network routers exposed to induced surges via PoE cabling. IC Role / Device Role / Timing Role: Parallel-connected TVS shunting 600 W transients away from upstream DC/DC converter input capacitors. Use Value: Extends capacitor lifetime by reducing RMS ripple stress during repeated 10/1000 µs surges up to 25.9 A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14CAHE3/I | Same electrical specs, but RoHS-compliant without halogen-free certification; not AEC-Q101 qualified. | Suitable for commercial-grade industrial controls where automotive qualification is unnecessary. | Select when cost sensitivity outweighs halogen-free or automotive requirements. |
| SMAJ14CAHM3 | Lower PPPM (400 W), larger VBR tolerance (15.6–18.3 V), same SMB package; halogen-free & AEC-Q101 qualified. | Used where lower surge energy (IEC 61000-4-5 Level 2) suffices and board space allows same footprint. | Choose for legacy designs migrating from SMAJ series with minimal layout change. |
Compared with SMBJ14CAHM3/I, SMBJ14CAHE3/I lacks halogen-free and AEC-Q101 validation, while SMAJ14CAHM3 trades 33 % peak power headroom for broader VBR tolerance and reduced surge capability - making SMBJ14CAHM3/I optimal for high-reliability 12 V automotive and industrial surge zones.
Availability
SMBJ14CAHM3/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, USB port ESD protection, and DC power rail surge suppression requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMBJ14CAHM3/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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability and application-specific performance.
The SMBJ series targets high-energy transient suppression in automotive, industrial, and telecom infrastructure, engineered for low clamping voltage, fast response, and robust thermal performance in compact SMB packages.
FAQ
What is the clamping voltage of SMBJ14CAHM3/I at its rated peak pulse current?
The SMBJ14CAHM3/I has a maximum clamping voltage (VC) of 23.2 V at 25.9 A peak pulse current (IPPM), measured under the standard 10/1000 µs waveform. This value ensures downstream components such as 3.3 V or 5 V microcontrollers remain within safe operating limits during surge events. The SMBJ14CAHM3/I achieves this with a low clamping ratio of approximately 1.43 relative to its VBR midpoint.
Is SMBJ14CAHM3/I suitable for automotive applications?
Yes, SMBJ14CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It is specified for junction temperatures up to +150 °C and meets MSL Level 1 reflow requirements - making it appropriate for engine bay, body control, and infotainment subsystems. The SMBJ14CAHM3/I is explicitly listed in Vishay's AEC-Q101 qualified product table.
How does SMBJ14CAHM3/I differ from unidirectional SMBJ14A variants?
The SMBJ14CAHM3/I is bidirectional, meaning it clamps voltage transients of either polarity symmetrically, whereas SMBJ14A is unidirectional and conducts only in reverse bias. This makes SMBJ14CAHM3/I ideal for AC-coupled or differential lines (e.g., CAN, RS-485), while SMBJ14A suits DC power rail protection with defined polarity. The SMBJ14CAHM3/I also omits cathode band marking, unlike SMBJ14A.
What is the thermal resistance of SMBJ14CAHM3/I, and how does it affect PCB layout?
The SMBJ14CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended copper pads (0.2" × 0.2"). To maintain safe junction temperature under sustained power dissipation, designers should use adequate copper pour and avoid excessive ambient temperature rise. The SMBJ14CAHM3/I's RθJL of 20 °C/W indicates efficient heat transfer to leads, supporting reliable operation in thermally constrained layouts.
Does SMBJ14CAHM3/I meet UL recognition standards?
Yes, SMBJ14CAHM3/I is Underwriters Laboratories (UL) recognized under file number E136766 for both unidirectional and bidirectional configurations, complying with UL 497B for signal line protectors. This UL recognition applies to the entire SMBJ family, including the SMBJ14CAHM3/I variant, and covers safety-related performance under transient overvoltage conditions.
SMBJ14CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ14CAHM3/I FAQ
1.How can I place an order for SMBJ14CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14CAHM3/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 SMBJ14CAHM3/I reliable?
The price and inventory of SMBJ14CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ14CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ14CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14CAHM3/I?
SMBJ14CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14CAHM3/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 SMBJ14CAHM3/I?
For technical support, including SMBJ14CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14CAHM3/I requirements.
6.How does Aetrix verify that SMBJ14CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ14CAHM3/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 SMBJ14CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ14CAHM3/I?
All SMBJ14CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14CAHM3/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 SMBJ14CAHM3/I part is unused and in its original packaging.
Return procedure for SMBJ14CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ14CAHM3/I Tags
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