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Vishay General Semiconductor - Diodes Division SMBJ14-E3/5B
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- Part No.:
- SMBJ14-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14-E3/5B.pdf
- Description:
- TVS DIODE 14VWM 25.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,689
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Product details
Overview
SMBJ14-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 14 V stand-off 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), commonly deployed on power rails and signal lines of industrial sensor interfaces.
For engineers reviewing the SMBJ14-E3/5B datasheet, SMBJ14-E3/5B pinout, SMBJ14-E3/5B application, or SMBJ14-E3/5B equivalent, key selection criteria include its unidirectional polarity, 1.0 µA max reverse leakage at VWM, 15.6–17.2 V breakdown voltage range (VBR), 150 °C max junction temperature, and RoHS-compliant matte tin-plated leads suitable for automated SMT assembly.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM = 14 V and rapidly transitions to low-impedance conduction above its breakdown threshold (VBR = 15.6–17.2 V at IT = 1.0 mA). Its response time is sub-nanosecond, enabling effective suppression of fast-rising ESD and surge events per IEC 61000-4-2 and IEC 61000-4-5.
The SMBJ14-E3/5B uses a glass-passivated silicon junction and is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W - critical for PCB pad layout design and thermal derating above 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 14 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin for 12 V nominal systems. |
| VBR (Breakdown Voltage) | 15.6–17.2 V at 1.0 mA - Confirmed minimum/maximum threshold where avalanche conduction begins; ensures reliable turn-on during overvoltage. |
| VC (Clamping Voltage) | 23.2 V at IPPM = 25.9 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; must stay below IC absolute maximum ratings. |
| IPPM (Peak Pulse Current) | 25.9 A - Maximum transient current the device can safely shunt without degradation; derived from 600 W rating and VC. |
| PPPM (Peak Pulse Power) | 600 W - Surge energy handling capability under standardized 10/1000 µs waveform; validates robustness against lightning-induced transients. |
| TJmax | 150 °C - Maximum allowable junction temperature; constrains power dissipation and PCB copper area requirements for thermal management. |
| Package | SMB (DO-214AA) - Surface-mount outline with 0.205" × 0.130" footprint; compatible with standard reflow profiles and J-STD-020 MSL Level 1. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; forms current path during reverse-biased clamping event. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail or signal); band-marked terminal; conducts when line voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates protection against severe lightning surges (IEC 61000-4-5 Level 4) on industrial power inputs without thermal runaway. |
| 23.2 V clamping voltage at 25.9 A | Ensures downstream 24 V-rated components (e.g., RS-485 transceivers, microcontroller I/O) remain within safe voltage limits during surge events. |
| 1.0 µA max reverse leakage at 14 V | Minimizes standby power loss and avoids false triggering in battery-powered sensor nodes operating near VWM. |
| RoHS-compliant, matte tin-plated leads | Enables lead-free reflow soldering per J-STD-002 and supports automated placement with zero whisker risk (JESD 201 Class 2). |
| 150 °C max junction temperature | Supports operation in high-ambient environments such as motor control enclosures or outdoor telecom cabinets without derating. |
Applications
| Industrial Sensor Interface Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop sensor outputs and analog input stages from ESD and load dump transients in factory automation PLCs. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and ground, responding within <1 ns to limit voltage excursions. Use Value: Prevents latch-up or permanent damage to precision op-amps and ADC front-ends by clamping transients to ≤23.2 V while maintaining <1 µA leakage at 14 V nominal supply. |
Use Scenario: Safeguarding 12 V power distribution networks in BCMs against ISO 7637-2 pulse 1 (inductive switch-off) and pulse 3a/b (load dump simulation). IC Role / Device Role / Timing Role: Primary overvoltage clamp on fused 12 V feed, positioned upstream of LDOs and MCU power inputs. Use Value: Absorbs 600 W surge energy without failure, ensuring system reset integrity and eliminating need for redundant protection layers in cost-sensitive automotive modules. |
| Telecom Power Supply Input Stage | Consumer Appliance Motor Drive Board |
|
Use Scenario: Shielding AC/DC adapter secondary-side DC outputs (12–24 V) from conducted surges entering via Ethernet or PoE lines in network infrastructure equipment. IC Role / Device Role / Timing Role: Secondary-side TVS on regulated output rail, coordinated with primary-side MOVs and common-mode chokes. Use Value: Provides precise 23.2 V clamping ceiling aligned with telecom IC absolute maximum ratings, reducing risk of cascading failures during multi-event surge testing. |
Use Scenario: Suppressing commutation spikes generated by brushed DC motors in washing machines and HVAC blowers connected to microcontroller-based motor drivers. IC Role / Device Role / Timing Role: Localized TVS across motor terminals and H-bridge supply rails to quench inductive kickback before it reaches gate drivers. Use Value: Withstands repetitive 100 A surge current (8.3 ms half-sine), enabling long-term reliability in high-cycle appliance applications without parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14A-E3/52 | Same electrical specs and SMB package; differs only in tape-and-reel packaging (750 pcs vs. 3200 pcs) and reel diameter (7" vs. 13"). | Identical functional performance; selected for lower-volume prototyping or small-batch production where smaller reels reduce inventory overhead. | Choose SMBJ14A-E3/52 for evaluation kits or pilot runs requiring fewer units per reel. |
| SMBJ14CA-E3/5B | Bidirectional variant with symmetric VBR (15.6–17.2 V) and same VC (23.2 V), but no polarity marking and double the ID limit (2.0 µA) for VWM ≤ 10 V devices - not applicable here. | Used where AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus) require suppression in both directions without external polarity routing. | Select SMBJ14CA-E3/5B only when protecting bidirectional data lines; SMBJ14-E3/5B remains optimal for unidirectional DC rails. |
Compared with SMBJ14A-E3/52, SMBJ14-E3/5B offers identical protection performance with higher volume packaging efficiency; versus SMBJ14CA-E3/5B, it provides dedicated unidirectional clamping essential for DC power integrity, avoiding unnecessary capacitance and leakage trade-offs inherent in bidirectional designs.
Availability
SMBJ14-E3/5B is available at Aetrix Electronics and suitable for industrial sensor interface protection, automotive body control module power rails, and telecom power supply input stages requiring stable component supply and full traceability.
Supply support for SMBJ14-E3/5B 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 and high-power handling.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting industrial automation, automotive electronics, and telecommunications infrastructure where surge immunity and long-term stability are mission-critical.
FAQ
What is the clamping voltage of SMBJ14-E3/5B and why does it matter?
The SMBJ14-E3/5B has a maximum clamping voltage (VC) of 23.2 V at 25.9 A peak pulse current (10/1000 µs waveform). This value represents the highest voltage imposed on the protected circuit during a surge event. It matters because downstream components - such as microcontrollers, transceivers, or sensors - must withstand this clamped level without damage or malfunction. For example, if an MCU's absolute maximum VDD rating is 25 V, the SMBJ14-E3/5B ensures safe operation even under worst-case transients.
Is SMBJ14-E3/5B RoHS-compliant and qualified for automotive use?
Yes, SMBJ14-E3/5B is RoHS-compliant (per JESD 201 Class 2 whisker test) and uses matte tin-plated leads solderable per J-STD-002. However, it is not AEC-Q101 qualified - that status applies only to variants with "HE3" or "HM3" suffixes (e.g., SMBJ14HE3_B/I). For automotive applications requiring qualification, SMBJ14-E3/5B may be used in non-safety-critical subsystems, but formal AEC-Q101 validation requires the HE3/HM3 versions.
How does SMBJ14-E3/5B differ from SMBJ14A-E3/52?
SMBJ14-E3/5B and SMBJ14A-E3/52 share identical electrical specifications, SMB (DO-214AA) package, and RoHS compliance. The sole difference is packaging: SMBJ14-E3/5B ships in 13" diameter reels containing 3200 units, whereas SMBJ14A-E3/52 uses 7" reels with 750 units. Both are functionally interchangeable; the choice depends on production volume, inventory turnover, and SMT line feeder compatibility.
Can SMBJ14-E3/5B be used in bidirectional signal lines like RS-485?
No - SMBJ14-E3/5B is a unidirectional TVS diode, marked with a cathode band and intended for DC rail or single-polarity signal protection. For bidirectional lines such as RS-485 or CAN, the bidirectional variant SMBJ14CA-E3/5B must be used. Using SMBJ14-E3/5B on AC-coupled or differential lines risks improper clamping during negative transients and may lead to device failure or incomplete protection.
What is the thermal resistance and how does it affect PCB layout for SMBJ14-E3/5B?
SMBJ14-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W. These values directly impact PCB copper pad sizing: the datasheet specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated power dissipation. Reducing pad area increases thermal impedance, causing premature thermal shutdown or parametric shift during repetitive surges - so adherence to recommended layout is essential for sustained 600 W pulse handling.
SMBJ14-E3/5B 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 25.8V
- Current - Peak Pulse (10/1000µs):
- 23.3A
- Power - Peak Pulse:
- 600W
- 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 (SMBJ)
SMBJ14-E3/5B FAQ
1.How can I place an order for SMBJ14-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14-E3/5B 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 SMBJ14-E3/5B reliable?
The price and inventory of SMBJ14-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ14-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ14-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14-E3/5B?
SMBJ14-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14-E3/5B 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 SMBJ14-E3/5B?
For technical support, including SMBJ14-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14-E3/5B requirements.
6.How does Aetrix verify that SMBJ14-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ14-E3/5B 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 SMBJ14-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ14-E3/5B?
All SMBJ14-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14-E3/5B, 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 SMBJ14-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ14-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ14-E3/5B Tags
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