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Vishay General Semiconductor - Diodes Division SMBJ14CAHM3_B/I
- Part No.:
- SMBJ14CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14CAHM3_B/I.pdf
- Description:
- 600W,14V,5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
SMBJ14CAHM3_B/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 and power lines. It features a 14 V standoff voltage (VWM), 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), protecting sensitive ICs and MOSFETs in industrial sensor interfaces.
For engineers reviewing the SMBJ14CAHM3_B/I datasheet, SMBJ14CAHM3_B/I pinout, SMBJ14CAHM3_B/I application, or SMBJ14CAHM3_B/I equivalent, this device is selected for robust ESD and surge protection in automotive-grade, high-reliability embedded systems where bidirectional clamping, low leakage (<1.0 µA at VWM), and AEC-Q101 qualification are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified at 15.6–17.2 V (min/max) under 1.0 mA test current. Its clamping behavior is defined by a low dynamic impedance, enabling fast suppression of transients induced by inductive switching or lightning surges.
Thermal performance is characterized by RθJA = 100 °C/W and RθJL = 20 °C/W, supporting operation up to +150 °C junction temperature. The device meets MSL Level 1 per J-STD-020 and is halogen-free, RoHS-compliant, and AEC-Q101 qualified - confirmed by HM3 suffix and "_B/I" tape-and-reel packaging code.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V nominal systems. |
| VBR (min/max) | 15.6 V / 17.2 V - Breakdown occurs within this range at 1.0 mA; ensures reliable triggering without premature conduction. |
| VC @ IPPM | 23.2 V - Clamped voltage at 25.9 A peak pulse (10/1000 µs); limits stress on downstream components during surge events. |
| IPPM | 25.9 A - Peak surge current capability; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity testing. |
| PPPM | 600 W - Peak pulse power rating; enables handling of high-energy transients without failure under repetitive 0.01% duty cycle. |
| ID @ VWM | <1.0 µA - Reverse leakage at standoff voltage; minimizes standby power loss and avoids false triggering in low-current circuits. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated terminals solderable per J-STD-002 and JESD 22-B102. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; symmetrical with cathode in bidirectional operation | Enables clamping in both directions - no DC polarity dependency; connects to protected line (e.g., CAN_H or RS-485 A). |
| Cathode | Current exit terminal in forward bias; symmetrical with anode in bidirectional operation | Provides identical clamping threshold as anode; ties to same reference (e.g., ground or common bus) as anode for balanced protection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both polarities - eliminates need for polarity-aware layout in differential or AC-coupled lines. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces - supports long-term reliability under thermal cycling and vibration. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges (1 kV open-circuit, 0.5 kA short-circuit) without degradation over lifetime. |
| Low clamping ratio (VC/VBR ≈ 1.43) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V or 5 V logic interfacing with 12 V buses. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow at 260 °C peak - compatible with standard SMT assembly without dry-pack or baking requirements. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role: Bidirectional transient clamp placed between sensor output and microcontroller ADC input. Use Value: Limits voltage excursion to ≤23.2 V during 100 A/50 ms load dump events, preserving ADC integrity and avoiding latch-up. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs subjected to EFT bursts and cable discharge events. IC Role / Device Role: Line-to-ground TVS on A/B differential pair, mounted adjacent to connector. Use Value: Clamps common-mode surges to <25 V while maintaining signal integrity up to 250 kbps due to low capacitance (~100 pF at 0 V). |
| Consumer USB-C Port ESD | Telecom DSL Line Surge |
|
Use Scenario: Secondary-level ESD protection on USB-C CC and VCONN lines in portable docking stations. IC Role / Device Role: Bidirectional TVS between signal line and chassis ground, downstream of primary polymer fuse. Use Value: Absorbs ±15 kV contact discharge (IEC 61000-4-2) with sub-1 ns response, preventing gate oxide damage in USB PD controllers. |
Use Scenario: Overvoltage protection on POTS line interface cards in DSLAM equipment facing lightning-induced surges. IC Role / Device Role: Primary surge limiter on tip/ring lines before transformer coupling and line driver ICs. Use Value: Handles 10/1000 µs surges up to 600 W without follow-on current, enabling compliance with GR-1089-CORE Zone 3 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_B/I | Same electrical specs, but RoHS-compliant commercial grade (not halogen-free); lacks AEC-Q101 qualification. | Suitable for non-automotive industrial or consumer use where halogen-free mandate or automotive qualification is not required. | Select when cost sensitivity outweighs halogen-free or automotive qualification requirements. |
| SMAJ14CAHM3_A/I | Lower 400 W PPPM, higher VC = 25.8 V at 17.4 A, SMA package (smaller footprint, lower thermal mass). | Used where board space is constrained and surge energy is limited to IEC 61000-4-4 EFT only - not recommended for IEC 61000-4-5. | Choose only if system-level surge testing does not exceed 400 W and PCB layout cannot accommodate SMB outline. |
Compared with SMBJ14CAHM3_B/I, the HE3 variant trades halogen-free construction and AEC-Q101 for lower cost in commercial applications, while the SMAJ14CAHM3_A/I reduces surge capacity and thermal robustness to fit tighter layouts - neither offers drop-in replacement without verifying layout clearance and system-level surge margin.
Availability
SMBJ14CAHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial RS-485 networks, and telecom line interface designs requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMBJ14CAHM3_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 diodes, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where consistent clamping, thermal resilience, and qualification rigor are mandatory.
FAQ
What is the clamping voltage of SMBJ14CAHM3_B/I at its rated peak pulse current?
The SMBJ14CAHM3_B/I has a maximum clamping voltage (VC) of 23.2 V at its rated peak pulse current (IPPM) of 25.9 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream circuitry. The SMBJ14CAHM3_B/I maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMBJ14CAHM3_B/I suitable for automotive applications?
Yes, SMBJ14CAHM3_B/I is AEC-Q101 qualified, halogen-free, and RoHS-compliant - explicitly designated for automotive use via the HM3 suffix and "_B/I" ordering code. It is validated for under-hood and body-control module applications, including CAN, LIN, and sensor signal protection where sustained operation at +125 °C ambient and resistance to thermal cycling are required. The SMBJ14CAHM3_B/I meets all stress test requirements defined in AEC-Q101 Rev D.
How does the bidirectional configuration of SMBJ14CAHM3_B/I affect its circuit placement?
The SMBJ14CAHM3_B/I has no polarity marking and functions identically in both directions, allowing placement between any two nodes requiring symmetrical overvoltage protection - such as across differential pairs (RS-485 A/B), AC signal paths, or ungrounded power rails. Unlike unidirectional TVS diodes, the SMBJ14CAHM3_B/I eliminates orientation errors during automated assembly and supports floating or isolated reference schemes without redesign. Its bidirectional nature is intrinsic to the die structure, not external circuitry.
What is the maximum reverse leakage current for SMBJ14CAHM3_B/I at its standoff voltage?
The SMBJ14CAHM3_B/I specifies a maximum reverse leakage current (ID) of 1.0 µA at its 14 V standoff voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage prevents measurable loading on high-impedance sensor outputs or battery-backed circuits. At elevated temperatures (e.g., +85 °C), leakage remains below 5 µA - verified per the device's derating curve in the official Vishay datasheet 88392.
Does SMBJ14CAHM3_B/I require special PCB layout considerations for thermal performance?
Yes - to achieve rated 600 W pulse power and maintain TJ ≤ 150 °C, the SMBJ14CAHM3_B/I must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Smaller pads increase RθJA beyond the typical 100 °C/W, risking thermal runaway during repetitive surges. The SMBJ14CAHM3_B/I's thermal resistance from junction to lead (RθJL = 20 °C/W) also requires direct thermal connection to internal ground planes or thermal vias for high-duty-cycle applications.
SMBJ14CAHM3_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:
- -
- 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_B/I FAQ
1.How can I place an order for SMBJ14CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14CAHM3_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 SMBJ14CAHM3_B/I reliable?
The price and inventory of SMBJ14CAHM3_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 SMBJ14CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ14CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14CAHM3_B/I?
SMBJ14CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14CAHM3_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 SMBJ14CAHM3_B/I?
For technical support, including SMBJ14CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ14CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ14CAHM3_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 SMBJ14CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ14CAHM3_B/I?
All SMBJ14CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14CAHM3_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 SMBJ14CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ14CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ14CAHM3_B/I Tags
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