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Vishay General Semiconductor - Diodes Division SMB8J14CA-E3/52
- Part No.:
- SMB8J14CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J14CA-E3/52.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J14CA-E3/52 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 SMB8J14CA-E3/52 datasheet, SMB8J14CA-E3/52 pinout, SMB8J14CA-E3/52 application, or SMB8J14CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low leakage (<1 µA at VWM), thermal resistance (RθJA = 72 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
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, and its glass-passivated junction ensures stable VBR over temperature and lifetime.
The SMB8J14CA-E3/52 is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and is qualified to AEC-Q101 for automotive under-hood and chassis applications - confirming robustness against thermal cycling, humidity, and mechanical stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing range for protected line. |
| VBR min/max | 15.6 V / 17.2 V at IT = 1 mA - tight breakdown tolerance ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 23.2 V at IPPM = 34.5 A - clamping voltage directly limits peak stress on downstream ICs during 10/1000 µs surge events. |
| PPPM | 800 W (10/1000 µs) - quantifies single-pulse energy handling capacity; derates linearly above 25 °C ambient per Fig. 2. |
| ID @ VWM | <1 µA - ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes and low-power systems. |
| TJ max | +150 °C - enables use in high-temperature automotive engine control units and industrial motor drives without derating. |
| RθJA | 72 °C/W - thermal resistance measured on 0.2" × 0.2" copper pads; informs PCB thermal design for sustained surge duty cycles. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; surge current flows bidirectionally between them during overvoltage events. |
| Case (body) | Thermal and mechanical interface | Plastic body provides electrical isolation; thermal path relies on soldered terminations to PCB copper for heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails - supports PPAP documentation. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure - critical for 15+ year automotive service life. |
| MSL Level 1 rating | Enables standard SMT reflow without pre-baking; compatible with 260 °C peak profile per J-STD-020 - reduces manufacturing complexity. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a), improving protection margin for 3.3 V/5 V logic. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation meets fire-safety requirements for industrial and transportation equipment enclosures. |
Applications
| Automotive Sensor Protection | Industrial PLC Analog Inputs |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed at connector interface to shunt surge energy before it reaches signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to 5 V tolerant transceivers during ISO 16750-2 load dump tests (up to 120 V, 400 ms) and ISO 7637-2 pulses. |
Use Scenario: Shielding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers from field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Primary front-end protection device mounted directly at terminal block entry point. Use Value: Maintains signal accuracy by limiting clamping voltage to 23.2 V while surviving repeated 1 kV/500 A surge events per IEC 61000-4-5. |
| Consumer USB Port Protection | Telecom Line Interface |
Use Scenario: Safeguarding USB 2.0 data lines (D+/D−) and VBUS against ESD (IEC 61000-4-2 ±15 kV air) and cable discharge events in docking stations and peripherals. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed adjacent to USB connector to minimize signal distortion. Use Value: Clamps transients within 1 ns while adding <1 pF parasitic capacitance - preserves signal integrity up to 480 Mbps without eye diagram degradation. |
Use Scenario: Protecting Ethernet PHY interfaces (10/100BASE-TX) and POTS line drivers from lightning-induced surges and AC power cross-talk in VoIP gateways and DSLAMs. IC Role / Device Role / Timing Role: Secondary protection stage following gas discharge tube (GDT), absorbing residual energy after primary diversion. Use Value: Handles 800 W peak pulse without degradation, enabling compliance with GR-1089-CORE Level 3 (lightning surge) and Telcordia requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14CA-E3/52 | Unidirectional variant with identical VWM/VBR/VC but asymmetric conduction; lacks reverse polarity tolerance. | Suitable only for DC-biased lines where polarity is fixed; not usable on AC or differential signals. | Select SMBJ14CA-E3/52 only when protecting unidirectional power rails (e.g., 12 V supply) with known polarity. |
| SMC8J14CA-E3/52 | Same electrical specs but in larger SMC (DO-214AB) package - higher thermal mass, RθJA = 40 °C/W, PPPM = 1500 W. | Better suited for high-duty-cycle or high-ambient environments (e.g., under-hood); requires larger PCB footprint. | Choose SMC8J14CA-E3/52 when thermal budget is constrained or surge repetition rate exceeds SMB8J14CA-E3/52 derating limits. |
Compared with SMBJ14CA-E3/52, SMB8J14CA-E3/52 enables polarity-agnostic protection without layout redesign; versus SMC8J14CA-E3/52, it offers space savings and cost efficiency where 800 W PPPM suffices and board area is limited.
Availability
SMB8J14CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog inputs, consumer USB port protection, and telecom line interface applications requiring stable component supply, AEC-Q101 compliance, and RoHS-compliant packaging.
Supply support for SMB8J14CA-E3/52 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, precision, and automotive-grade qualification.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density, surface-mount surge suppression in harsh environments - targeting automotive, industrial, and communications infrastructure.
FAQ
What is the clamping voltage of SMB8J14CA-E3/52 and how is it measured?
The SMB8J14CA-E3/52 has a maximum clamping voltage (VC) of 23.2 V, measured at a peak pulse current (IPPM) of 34.5 A using a standardized 10/1000 µs double-exponential waveform. This value represents the upper voltage limit imposed on the protected line during surge events and is guaranteed across the full operating temperature range (-55 °C to +150 °C). The SMB8J14CA-E3/52 achieves this performance via controlled avalanche breakdown in its bidirectional silicon junction.
Is SMB8J14CA-E3/52 suitable for automotive applications?
Yes, SMB8J14CA-E3/52 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood and chassis-mounted modules. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and operation up to +150 °C junction temperature - all validated per AEC-Q101 test conditions. The SMB8J14CA-E3/52 is commonly deployed in engine control units, ADAS camera modules, and body control modules for transient protection.
How does SMB8J14CA-E3/52 differ from unidirectional SMBJ14CA-E3/52?
The SMB8J14CA-E3/52 is bidirectional, meaning it clamps voltage surges equally in both polarities - ideal for AC-coupled, differential, or polarity-unknown signal lines. In contrast, SMBJ14CA-E3/52 is unidirectional and conducts only when cathode is positive relative to anode. Both share identical VWM (14 V), VBR (15.6–17.2 V), and VC (23.2 V), but SMB8J14CA-E3/52 has no polarity marking and cannot be substituted for SMBJ14CA-E3/52 in DC-biased circuits without verifying conduction path integrity.
What PCB layout guidance applies to SMB8J14CA-E3/52?
Vishay specifies mounting SMB8J14CA-E3/52 on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated thermal and surge performance. Pad dimensions must follow DO-214AA outline: 2.18–2.159 mm width, 5.59 mm length, with 1.52 mm minimum solder mask clearance. Avoid thermal reliefs on pads; use solid copper connections to internal ground/power planes to sustain 34.5 A peak current and manage 72 °C/W junction-to-ambient rise.
Does SMB8J14CA-E3/52 meet RoHS and halogen-free requirements?
Yes, the "E3" suffix in SMB8J14CA-E3/52 denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads and UL 94 V-0 compliant molding compound. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE, and satisfies EU RoHS Directive 2011/65/EU. While not halogen-free (which would require "M3" suffix), the SMB8J14CA-E3/52 remains fully compliant for most industrial and automotive applications where halogen content is not restricted.
SMB8J14CA-E3/52 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):
- 34.5A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J14CA-E3/52 FAQ
1.How can I place an order for SMB8J14CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J14CA-E3/52 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 SMB8J14CA-E3/52 reliable?
The price and inventory of SMB8J14CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J14CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J14CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J14CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J14CA-E3/52?
SMB8J14CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J14CA-E3/52 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 SMB8J14CA-E3/52?
For technical support, including SMB8J14CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J14CA-E3/52 requirements.
6.How does Aetrix verify that SMB8J14CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J14CA-E3/52 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 SMB8J14CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J14CA-E3/52?
All SMB8J14CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J14CA-E3/52, 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 SMB8J14CA-E3/52 part is unused and in its original packaging.
Return procedure for SMB8J14CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J14CA-E3/52 Tags
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