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Vishay General Semiconductor - Diodes Division SMBJ14CAHM3_A/H
- Part No.:
- SMBJ14CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14CAHM3_A/H.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ14CAHM3_A/H from Vishay General Semiconductor is a bidirectional 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 standoff voltage (VWM), 15.6–17.2 V breakdown range (VBR at 1 mA), 23.2 V 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 of industrial sensor interfaces.
For engineers reviewing the SMBJ14CAHM3_A/H datasheet, SMBJ14CAHM3_A/H pinout, SMBJ14CAHM3_A/H application, or SMBJ14CAHM3_A/H equivalent, this device is selected for bidirectional surge immunity in automotive-grade industrial control modules, DC power input stages, and RS-485/RS-232 interface protection where low clamping voltage and AEC-Q101 qualification are critical.
Technical Context
This TVS operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports fast energy dissipation during ESD or lightning-induced surges.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility. Its thermal resistance (RθJA = 100 °C/W) reflects standard PCB pad layout performance, and it is halogen-free, RoHS-compliant, and AEC-Q101 qualified under HM3 suffix designation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 12 V nominal systems. |
| VBR (min/max) | 15.6 V / 17.2 V at 1 mA - Verified breakdown threshold range ensuring reliable triggering across process variation and temperature. |
| VC @ IPPM | 23.2 V at 25.9 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress below 24 V absolute maximum ratings. |
| PPPM | 600 W - Peak pulse power handling capability with 0.01% duty cycle; sufficient for IEC 61000-4-5 Level 4 (4 kV) surge events. |
| IPPM | 25.9 A - Peak surge current supported at VC; enables protection of 24 V industrial bus lines with >200 Ω source impedance. |
| TJ max. | 150 °C - Maximum junction temperature; allows operation in under-hood or enclosed industrial enclosures without derating. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals function as interchangeable anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (Pin 1 & Pin 2) | Bidirectional transient conduction path | Either terminal serves as current entry point during positive or negative transients; no DC polarity dependency required in layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for under-dash ECUs and body control modules. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental compliance requirements without compromising surge performance or thermal stability. |
| 600 W peak pulse power (10/1000 µs) | Supports high-energy transient suppression in industrial motor drives and PoE-powered devices without thermal runaway. |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes voltage overshoot during clamping - critical for protecting 16 V-tolerant microcontrollers and CAN transceivers. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture-related popcorning or delamination risks. |
Applications
| Industrial Sensor Interface Protection | Automotive Body Control Module Input |
|---|---|
Use Scenario: Protecting analog and digital signal lines (e.g., 4–20 mA, LIN, PWM) from inductive switching spikes in factory automation sensors. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, absorbing ±1 kV EFT bursts per IEC 61000-4-4. Use Value: Limits transient excursion to ≤23.2 V, preventing latch-up or damage to ADC inputs and microcontroller GPIOs rated for 24 V absolute max. |
Use Scenario: Safeguarding 12 V supply inputs of BCMs against load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Primary front-end TVS on main power rail, coordinated with upstream fuse and downstream DC/DC converter. Use Value: Clamps 12 V rail to 23.2 V within nanoseconds, allowing downstream regulators to remain functional during 35 V/100 ms load dump events. |
| RS-485 Transceiver Bus Line Protection | DC Power Input Stage (24 V Systems) |
Use Scenario: Shielding differential data lines of isolated RS-485 transceivers in building automation networks exposed to cable-induced surges. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground, suppressing common-mode transients up to ±2 kV. Use Value: Maintains signal integrity by limiting common-mode voltage excursion to <24 V, preserving receiver common-mode range and avoiding false triggering. |
Use Scenario: Front-end protection for 24 V DC power supplies feeding PLC I/O modules, servo drivers, and HMI panels. IC Role / Device Role / Timing Role: Unidirectional/bidirectional TVS placed after input filter but before bulk capacitor and regulator. Use Value: Absorbs 600 W surge energy without degradation, enabling compliance with UL 61000-4-5 Level 4 (4 kV line-to-ground) requirements. |
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_A/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (not AEC-Q101 qualified); uses matte tin plating without halogen-free constraint. | Lacks automotive qualification; suitable for consumer or industrial non-automotive designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and halogen-free status is optional. |
| SMAJ14CAHM3_A/H | Lower 400 W peak pulse power (vs. 600 W), same VWM/VC, but in smaller SMA (DO-214AC) package with higher RθJA (140 °C/W). | Reduced surge margin and higher thermal resistance limit use to lower-energy transients or better-cooled layouts. | Choose only if board space is constrained and surge threat level is limited to IEC 61000-4-5 Level 2 (1 kV). |
Compared with SMBJ14CAHE3_A/H, the SMBJ14CAHM3_A/H adds AEC-Q101 qualification and halogen-free compliance without sacrificing electrical performance; versus SMAJ14CAHM3_A/H, it delivers 50% higher surge power handling and superior thermal management in identical PCB area.
Availability
SMBJ14CAHM3_A/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and RS-485 communication systems requiring stable component supply with guaranteed long-term sourcing and automotive-grade traceability.
Supply support for SMBJ14CAHM3_A/H 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, efficiency, and application-specific optimization.
The SMBJ series targets high-reliability transient suppression in harsh environments - engineered for automotive, industrial, and telecom applications where consistent clamping performance and qualification rigor are mandatory.
FAQ
What is the clamping voltage of SMBJ14CAHM3_A/H at its rated peak pulse current?
The SMBJ14CAHM3_A/H has a maximum clamping voltage (VC) of 23.2 V at its rated peak pulse current of 25.9 A (10/1000 µs waveform). This value is measured under standardized test conditions and ensures predictable overvoltage limiting for downstream circuitry. The SMBJ14CAHM3_A/H maintains this clamping performance across its qualified temperature range and is validated per AEC-Q101 stress tests.
Is SMBJ14CAHM3_A/H suitable for automotive applications?
Yes, SMBJ14CAHM3_A/H is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials under Vishay's HM3 automotive-grade process. It is explicitly intended for automotive use cases including body control modules, infotainment power rails, and sensor interfaces where reliability under thermal cycling, humidity, and surge stress is required. The SMBJ14CAHM3_A/H carries full automotive traceability and qualification documentation.
How does the bidirectional design of SMBJ14CAHM3_A/H affect its circuit placement?
The SMBJ14CAHM3_A/H has no polarity marking and functions identically in either orientation, simplifying PCB layout and eliminating risk of reverse installation. Engineers place it between the protected node and ground (for shunt protection) without regard to anode/cathode direction - ideal for AC-coupled lines, differential buses like RS-485, or unregulated DC inputs where transient polarity is unpredictable. This symmetry is intrinsic to the SMBJ14CAHM3_A/H device structure.
What is the standoff voltage (VWM) of SMBJ14CAHM3_A/H, and why is it important?
The standoff voltage (VWM) of SMBJ14CAHM3_A/H is 14 V - the maximum DC or continuous reverse voltage the device blocks without significant leakage (<1.0 µA). This parameter defines the operational margin below breakdown and must be selected ≥15% above the system's maximum normal operating voltage (e.g., 12 V nominal rails) to avoid false triggering. The SMBJ14CAHM3_A/H's 14 V VWM makes it optimal for 12 V automotive and industrial systems.
Does SMBJ14CAHM3_A/H require heatsinking in typical applications?
No, SMBJ14CAHM3_A/H is designed for surface-mount operation without external heatsinking under standard PCB conditions - its RθJA of 100 °C/W assumes minimum recommended copper pad layout (0.2" × 0.2" per terminal). For repetitive surge events or high ambient temperatures (>85 °C), thermal relief via increased copper area or internal layer planes is advised, but the SMBJ14CAHM3_A/H remains fully functional within its 150 °C TJ limit using standard FR-4 mounting.
SMBJ14CAHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SMBJ14CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14CAHM3_A/H 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_A/H reliable?
The price and inventory of SMBJ14CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ14CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ14CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14CAHM3_A/H?
SMBJ14CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14CAHM3_A/H 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_A/H?
For technical support, including SMBJ14CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ14CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ14CAHM3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ14CAHM3_A/H?
All SMBJ14CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14CAHM3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for SMBJ14CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ14CAHM3_A/H Tags
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