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Vishay General Semiconductor - Diodes Division SMB8J14CAHM3/H
- Part No.:
- SMB8J14CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J14CAHM3/H.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,009
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Product details
Overview
SMB8J14CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 14 V stand-off voltage (VWM), 23.2 V maximum clamping voltage (VC) at 34.5 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - suitable for automotive sensor interface and industrial I/O line protection.
For engineers reviewing the SMB8J14CAHM3/H datasheet, SMB8J14CAHM3/H pinout, SMB8J14CAHM3/H application, or SMB8J14CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance (RθJL = 20 °C/W) for reliable operation in under-hood automotive environments.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging an avalanche breakdown mechanism to divert surge energy away from downstream circuitry. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
Designed per ANSI/IEEE C62.35 standards, it delivers fast response time (<1 ns), low incremental surge resistance, and stable clamping performance across -55 °C to +150 °C junction temperature range - validated for automotive-grade reliability under repetitive surge stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 15.6 V / 17.2 V at 1 mA - ensures consistent avalanche turn-on across production lot |
| VC @ IPPM | 23.2 V at 34.5 A - limits voltage seen by protected IC to safe level during 10/1000 µs surge |
| PPPM | 800 W - sustains high-energy transients such as ISO 7637-2 Pulse 1/2a/5a in automotive systems |
| ID @ VWM | 1.0 µA - negligible leakage current preserves signal integrity in high-impedance sensor interfaces |
| TJ max | +150 °C - supports under-hood placement in engine control units and ADAS modules |
| RθJL | 20 °C/W - enables effective heat transfer to PCB copper pads for sustained surge duty cycles |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Cathode band not marked (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry (positive half-cycle) | Connects to line under protection; conducts during positive overvoltage events |
| Cathode | Surge current entry (negative half-cycle) | Connects to line under protection; conducts during negative overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and ESD |
| Halogen-free & RoHS-compliant | Meets automotive environmental mandates and end-of-life recycling requirements |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during fast transients, reducing risk of IC latch-up |
| MSL Level 1 rating | Enables standard SMT assembly without moisture-sensitive handling precautions |
| Glass passivated junction | Ensures long-term stability and corrosion resistance in humid or chemically aggressive environments |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, responding within <1 ns to limit transient voltage to ≤23.2 V. Use Value: Prevents damage to 3.3 V/5 V microcontrollers and analog front-ends while maintaining signal fidelity due to low 1.0 µA leakage at 14 V. | Use Scenario: Safeguarding PLC digital input modules against field-wiring surges and electrostatic discharge in factory automation systems. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across input terminals to shunt 800 W surges (10/1000 µs) without degradation over 10⁴+ events. Use Value: Eliminates need for external series impedance or RC filtering, enabling direct connection to 24 V DC inputs with minimal BOM impact. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Shielding RS-485 transceivers in base station backhaul equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary surge suppression element mounted at connector entry point, clamping common-mode transients up to ±23.2 V. Use Value: Maintains signal integrity over 10 Mbps data rates due to low junction capacitance (~100 pF at 0 V) and symmetric bidirectional response. | Use Scenario: Adding robust ESD and surge immunity to USB 2.0 data lines (D+/D−) in portable medical devices and smart home hubs. IC Role / Device Role / Timing Role: Bidirectional TVS placed differentially across D+/D− to suppress ±15 kV contact ESD (IEC 61000-4-2) and 100 V/m RF immunity events. Use Value: Achieves system-level pass without additional ferrites or common-mode chokes, verified per AEC-Q101 temperature cycling and humidity testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J14CAHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Acceptable for non-automotive industrial use where halogen-free mandate does not apply | Select when cost sensitivity outweighs halogen-free requirement and automotive qualification is retained |
| SMAJ14CA | Lower PPPM (400 W), higher RθJA (110 °C/W), SMA package (smaller footprint, lower surge capacity) | Limited to low-energy consumer applications; unsuitable for automotive load dump or industrial 24 V I/O | Choose only for space-constrained designs with sub-400 W surge exposure and no AEC-Q101 requirement |
Compared with SMB8J14CAHM3/H, SMB8J14CAHE3/H offers identical protection performance and automotive qualification but lacks halogen-free certification, while SMAJ14CA trades surge robustness and thermal performance for smaller size - making SMB8J14CAHM3/H the optimal choice for AEC-Q101–mandated, high-reliability 800 W surge environments.
Availability
SMB8J14CAHM3/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O modules, telecom line interface circuits, and consumer USB port protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J14CAHM3/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, power density, and automotive qualification.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density, bidirectional surge suppression in harsh automotive and industrial environments where AEC-Q101 compliance and thermal robustness are mandatory.
FAQ
What is the clamping voltage of SMB8J14CAHM3/H at its rated peak pulse current?
The SMB8J14CAHM3/H has a maximum clamping voltage (VC) of 23.2 V at its rated peak pulse current (IPPM) of 34.5 A, measured using the standardized 10/1000 µs double-exponential surge waveform. This value ensures protected downstream components experience no more than 23.2 V during worst-case transient events, directly supporting 24 V system compatibility and IC safety margins. The SMB8J14CAHM3/H maintains this clamping performance across its full operating temperature range.
Is SMB8J14CAHM3/H certified for automotive applications?
Yes, SMB8J14CAHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction with automotive-grade reliability validation. It undergoes rigorous stress testing including high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and ESD per JESD22-A114. This makes SMB8J14CAHM3/H suitable for engine control units, ADAS sensors, and body electronics where long-term field reliability is critical.
What is the standoff voltage (VWM) and why is it important for SMB8J14CAHM3/H?
The standoff voltage (VWM) of SMB8J14CAHM3/H is 14 V - the maximum continuous reverse voltage the device can block without entering avalanche conduction. This parameter defines the upper limit of normal operating voltage on the protected line, ensuring the SMB8J14CAHM3/H remains non-conductive during steady-state conditions while remaining ready to clamp transients exceeding this threshold. Selecting a VWM ≥110 % of system nominal voltage prevents false triggering and leakage-related power loss.
How does the SMB8J14CAHM3/H package compare to SMA or SMC variants in terms of thermal performance?
The SMB8J14CAHM3/H uses the SMB (DO-214AA) package with a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, significantly lower than the SMA (RθJL ≈ 45 °C/W) and comparable to SMC (RθJL ≈ 18 °C/W). This enables more efficient heat dissipation into PCB copper pads during repetitive surge events. Unlike SMA, the SMB8J14CAHM3/H supports 800 W peak pulse power - double that of SMAJ14CA - making it appropriate for high-energy automotive and industrial applications where thermal management is critical.
Can SMB8J14CAHM3/H be used in bidirectional signal lines like RS-485 or USB differential pairs?
Yes, SMB8J14CAHM3/H is explicitly designed as a bidirectional TVS diode, making it ideal for protecting balanced differential interfaces such as RS-485, CAN, LIN, and USB D+/D− lines. Its symmetrical breakdown characteristics ensure equal clamping in both polarities, preserving signal integrity without introducing DC offset or asymmetry. With 1.0 µA leakage at 14 V and ~100 pF junction capacitance at 0 V, the SMB8J14CAHM3/H minimizes signal distortion and meets high-speed interface timing budgets up to 12 Mbps.
SMB8J14CAHM3/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:
- 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):
- 34.5A
- Power - Peak Pulse:
- 800W
- 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)
SMB8J14CAHM3/H FAQ
1.How can I place an order for SMB8J14CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J14CAHM3/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 SMB8J14CAHM3/H reliable?
The price and inventory of SMB8J14CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J14CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMB8J14CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J14CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J14CAHM3/H?
SMB8J14CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J14CAHM3/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 SMB8J14CAHM3/H?
For technical support, including SMB8J14CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J14CAHM3/H requirements.
6.How does Aetrix verify that SMB8J14CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB8J14CAHM3/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 SMB8J14CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMB8J14CAHM3/H?
All SMB8J14CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J14CAHM3/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 SMB8J14CAHM3/H part is unused and in its original packaging.
Return procedure for SMB8J14CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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