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Vishay General Semiconductor - Diodes Division SMB8J14CAHE3_B/I
- Part No.:
- SMB8J14CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J14CAHE3_B/I.pdf
- Description:
- 800W,14V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,065
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Product details
Overview
SMB8J14CAHE3_B/I 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), 15.6–17.2 V breakdown voltage (VBR) at 1 mA, 23.2 V clamping voltage (VC) at 34.5 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J14CAHE3_B/I datasheet, SMB8J14CAHE3_B/I pinout, SMB8J14CAHE3_B/I application, or SMB8J14CAHE3_B/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.66), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection against ESD, lightning-induced transients, and inductive switching spikes without polarity dependency. Its glass-passivated junction ensures stable VBR tolerance (±5%), low incremental surge resistance, and fast response time (<1 ns), critical for safeguarding sensitive analog front-ends and CAN/LIN bus receivers.
The device is rated for -55 °C to +150 °C operating junction temperature, meets JESD22-B102 solderability and JESD201 Class 2 whisker resistance, and is qualified to AEC-Q101 for automotive under-hood and body electronics applications - with thermal resistance RθJA = 72 °C/W and RθJL = 20 °C/W enabling reliable power dissipation in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 12 V automotive systems. |
| VBR (min/max) | 15.6 V / 17.2 V at IT = 1 mA - tight breakdown window ensures predictable turn-on and minimal overvoltage exposure during transients. |
| VC @ IPPM | 23.2 V at 34.5 A - clamping voltage limits downstream IC stress during 800 W surge events; VC/VWM = 1.66 indicates high efficiency. |
| PPPM | 800 W (10/1000 µs) - sustains high-energy surges typical of ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3/4 tests. |
| ID @ VWM | 1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes and low-power ECUs. |
| TJ max. | +150 °C - supports under-hood deployment in engine control units, transmission modules, and ADAS camera systems. |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline (4.57 mm × 3.94 mm × 2.20 mm) compatible with standard reflow profiles and pick-and-place equipment. |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking - symmetrical construction enables mounting without orientation concern. Terminals are matte tin-plated, solderable per J-STD-002 and JESD22-B102, with recommended pad layout of 0.2" × 0.2" (5.0 mm × 5.0 mm) copper per terminal for thermal and surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; bidirectional clamping occurs regardless of voltage polarity - eliminates need for orientation verification during assembly. |
| Cathode band (absent) | Polarity indicator | Not present - confirms bidirectional configuration; distinguishes SMB8J14CA from unidirectional variants like SMB10J14A. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for Tier-1 ECU and sensor module BOMs. |
| MSL Level 1 (260 °C peak) | Zero floor life limitation; supports standard lead-free reflow without baking - reduces manufacturing overhead and avoids moisture-related popcorning. |
| Glass passivated junction | Stable VBR drift < ±3% over lifetime and temperature; prevents parameter shift in harsh environments (e.g., under-hood thermal cycling). |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V/5 V logic interfaces and precision analog sensors with narrow absolute maximum ratings. |
| 800 W peak pulse power | Withstands repeated ISO 7637-2 Pulse 5a (50 V, 100 ms) surges without degradation - enables single-device protection for LIN bus and CAN FD physical layers. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting ABS wheel speed sensor outputs and ambient temperature sensor lines from load dump and alternator ripple in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching MCU ADC inputs or signal conditioners. Use Value: Prevents latch-up or permanent damage to 16-bit SAR ADCs and op-amps by limiting voltage excursion to ≤23.2 V during 100 V/50 ms load dump events. |
Use Scenario: Shielding RS-485 transceiver data lines in programmable logic controller (PLC) backplanes from EFT bursts and ground loop surges. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) TVS mounted adjacent to transceiver pins to clamp common-mode transients without distorting 10 Mbps differential signaling. Use Value: Maintains signal integrity up to 25 MHz while surviving IEC 61000-4-4 Level 4 (4 kV) EFT - verified via TDR measurements in reference design AN934. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
|
Use Scenario: Safeguarding LIN bus transceivers in door module ECUs exposed to cable harness coupling and electrostatic discharge during assembly. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) clamping device placed between LIN PHY and connector, with leakage <1 µA preserving bus idle state. Use Value: Enables compliance with ISO 10605 (30 kV air, 15 kV contact discharge) without adding series impedance or degrading bus rise/fall times. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart washing machine control boards operating on 24 V DC rails. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to absorb inductive kickback energy before it couples into MCU power supply or Hall-effect position sensors. Use Value: Eliminates need for snubber RC networks - reduces BOM count by one component while maintaining 800 W surge handling per pulse per IEC 61000-4-5 Ed.3 Annex A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J14CAHM3_B/I | Halogen-free variant with identical electrical specs and AEC-Q101 qualification; same SMB package and pinout. | Required where halogen-free compliance (IEC 61249-2-21) is mandated for end-product environmental certification. | Select SMB8J14CAHM3_B/I when RoHS + halogen-free material declaration is contractually required - no design or layout changes needed. |
| SMAJ14CA-E3/5B | Lower PPPM (400 W), higher RθJA (110 °C/W), SMA package (smaller footprint but lower thermal mass); not AEC-Q101 qualified. | Suitable for cost-sensitive consumer electronics with lower surge threat levels (e.g., USB port protection), not automotive or industrial. | Choose SMAJ14CA-E3/5B only for non-automotive applications with ≤400 W surge requirements and space-constrained layouts - requires thermal derating above 75 °C ambient. |
Compared with SMB8J14CAHE3_B/I, the HM3 variant offers identical protection performance with halogen-free materials, while the SMAJ14CA-E3/5B trades surge robustness and automotive qualification for smaller size and lower cost - making SMB8J14CAHE3_B/I the optimal choice for AEC-Q101-compliant, high-reliability 12 V system protection.
Availability
SMB8J14CAHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O protection, body control modules, and appliance motor drive circuits requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMB8J14CAHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMB8JxxCA family is engineered for high-energy transient suppression in automotive and industrial environments - delivering AEC-Q101-compliant, bidirectional clamping with optimized thermal performance in standard SMB packaging.
FAQ
What is the clamping voltage of SMB8J14CAHE3_B/I at its rated peak pulse current?
The SMB8J14CAHE3_B/I has a maximum clamping voltage (VC) of 23.2 V at its specified peak pulse current (IPPM) of 34.5 A, measured using the 10/1000 µs waveform. This value is guaranteed per the Vishay datasheet revision 09-Jan-2024, Document Number 88422, and reflects the actual voltage seen by protected circuitry during an 800 W transient event. The SMB8J14CAHE3_B/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMB8J14CAHE3_B/I suitable for automotive applications?
Yes, SMB8J14CAHE3_B/I is explicitly AEC-Q101 qualified and designated for automotive use, as confirmed by its HE3 suffix and documentation in Vishay's 88422 datasheet. It supports under-hood and body electronics applications including LIN bus protection, sensor interface shielding, and BCM power rail conditioning. The SMB8J14CAHE3_B/I undergoes rigorous stress testing per AEC-Q101 including HTGB, HTRB, and temperature cycling - making it appropriate for Tier-1 and OEM automotive BOMs.
What does the "HE3" and "_B/I" suffix mean in SMB8J14CAHE3_B/I?
The "HE3" suffix denotes RoHS-compliant and AEC-Q101-qualified construction, while "_B/I" specifies packaging: "B" indicates tape-and-reel format with 13-inch diameter reel, and "I" denotes a base quantity of 3200 units per reel. This matches Vishay's ordering convention in Document 88422, where SMB8J14CAHE3_B/I is listed under "ORDERING INFORMATION" with unit weight 0.106 g and delivery mode "13\" diameter plastic tape and reel". The SMB8J14CAHE3_B/I is fully compatible with standard SMT pick-and-place equipment calibrated for SMB (DO-214AA) devices.
How does SMB8J14CAHE3_B/I differ from unidirectional variants like SMB10J14A?
SMB8J14CAHE3_B/I is bidirectional with symmetrical clamping behavior and no cathode band, whereas SMB10J14A is unidirectional, features a cathode marking, and delivers 1000 W PPPM (vs. 800 W for SMB8J14CAHE3_B/I). The SMB8J14CAHE3_B/I has a lower stand-off voltage (14 V vs. 14 V nominal but tested at different IT conditions), and its breakdown range (15.6–17.2 V) is defined at 1 mA versus SMB10J14A's 10 mA test current. These differences make SMB8J14CAHE3_B/I ideal for AC-coupled or polarity-agnostic lines, while SMB10J14A suits DC power rail protection.
What is the thermal resistance of SMB8J14CAHE3_B/I, and how does it affect layout?
SMB8J14CAHE3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W, measured on 0.2" × 0.2" copper pads per terminal. To achieve rated 800 W surge capability, PCB layout must provide minimum 5.0 mm × 5.0 mm copper area per pad - reducing thermal impedance and preventing junction overheating during repetitive transients. The SMB8J14CAHE3_B/I's low RθJL also supports effective heat transfer to internal ground planes via thermal vias, especially in multilayer automotive PCBs.
SMB8J14CAHE3_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:
- 14V
- 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)
SMB8J14CAHE3_B/I FAQ
1.How can I place an order for SMB8J14CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J14CAHE3_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 SMB8J14CAHE3_B/I reliable?
The price and inventory of SMB8J14CAHE3_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 SMB8J14CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMB8J14CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J14CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J14CAHE3_B/I?
SMB8J14CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J14CAHE3_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 SMB8J14CAHE3_B/I?
For technical support, including SMB8J14CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J14CAHE3_B/I requirements.
6.How does Aetrix verify that SMB8J14CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMB8J14CAHE3_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 SMB8J14CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMB8J14CAHE3_B/I?
All SMB8J14CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J14CAHE3_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 SMB8J14CAHE3_B/I part is unused and in its original packaging.
Return procedure for SMB8J14CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J14CAHE3_B/I Tags
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