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Vishay General Semiconductor - Diodes Division SMBJ14A-E3/5B
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- Part No.:
- SMBJ14A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14A-E3/5B.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,698
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Product details
Overview
SMBJ14A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping inductive switching transients and ESD events on power and signal lines. It features a 14 V standoff voltage (VWM), 15.6–17.2 V breakdown range at 1 mA, 23.2 V maximum clamping voltage at 25.9 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial sensor interfaces and DC power rail protection.
For engineers reviewing the SMBJ14A-E3/5B datasheet, SMBJ14A-E3/5B pinout, SMBJ14A-E3/5B application, or SMBJ14A-E3/5B equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, thermal derating above 25 °C, unidirectional polarity marking (cathode band), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS operates as a voltage-clamping device: under normal bias it presents high impedance (<1 µA leakage at 14 V), then rapidly avalanches when reverse voltage exceeds VBR, limiting transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
The SMBJ14A-E3/5B is rated for 100 A non-repetitive forward surge (8.3 ms half-sine), junction temperature range of –55 °C to +150 °C, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. It is RoHS-compliant (E3 suffix), commercial grade, and not AEC-Q101 qualified.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line's steady-state voltage. |
| VBR @ IT = 1 mA | 15.6–17.2 V - guaranteed breakdown onset range; defines minimum overvoltage threshold for clamping activation. |
| VC @ IPPM = 25.9 A | 23.2 V - maximum clamped voltage during 600 W transient; must remain below downstream IC's absolute max rating. |
| IPPM | 25.9 A - peak pulse current supported with 10/1000 µs waveform; determines surge energy handling (600 W). |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance on standard PCB pad; requires thermal design consideration above 25 °C ambient. |
| PPPM | 600 W - peak pulse power dissipation capability; defines transient energy absorption capacity per event. |
| ID @ VWM | 1.0 µA max - reverse leakage at 14 V; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode-indicated by molded band. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to protected line's low-side or ground reference; completes clamping path during overvoltage events. |
| Cathode | Reverse-biased terminal / clamping node | Marked with band; connected to protected line (e.g., 12 V rail or sensor output); avalanche conduction occurs here during transients. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 3 surges (1 kV/42 Ω) on 12–24 V systems without derating. |
| 23.2 V clamping voltage at 25.9 A | Provides ≥1.8 V margin below typical 25 V absolute max rating of industrial microcontrollers and analog front-ends. |
| Low 1.0 µA leakage at 14 V | Minimizes quiescent current draw in battery-powered sensor nodes and avoids false triggering in high-impedance signal paths. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh industrial environments. |
Applications
| Industrial Sensor Signal Protection | DC Power Rail Clamping |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop sensor outputs from inductive kickback and ESD during field wiring. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground, clamping transients before they reach op-amp input or ADC driver. Use Value: Limits voltage excursion to ≤23.2 V, preserving signal chain integrity and preventing latch-up in precision analog circuitry. |
Use Scenario: Safeguarding 12 V or 24 V DC input rails in PLC modules against load dump and relay coil flyback. IC Role / Device Role / Timing Role: TVS mounted directly across input terminals, shunting surge energy to chassis ground within nanoseconds. Use Value: Absorbs 600 W pulses without degradation, maintaining system uptime and eliminating need for bulkier MOV-based solutions. |
| Automotive Body Control Module Inputs | Telecom Line Interface Protection |
|
Use Scenario: Shielding switch inputs and LED driver control lines in non-safety-critical automotive body electronics. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to vehicle ground, activated only on positive-going transients exceeding 14 V. Use Value: Provides cost-effective, AEC-Q101–optional protection where full qualification is not mandated but reliability is critical. |
Use Scenario: Guarding RS-485 transceiver I/O pins against lightning-induced surges on outdoor telecom links. IC Role / Device Role / Timing Role: TVS placed differential-to-ground on each data line, suppressing common-mode transients before receiver input stage. Use Value: Achieves <23.2 V clamping while maintaining signal fidelity up to 10 Mbps due to low junction capacitance (~100 pF). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14CA-E3/5B | Bidirectional variant; symmetric VBR (15.6–17.2 V) in both polarities; no cathode marking. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-232, audio); unsuitable for DC rail clamping where polarity matters. | Select SMBJ14CA-E3/5B only when protecting bidirectional signals or when reverse polarity tolerance is mandatory. |
| SMAJ14A-E3/52 | Same VWM/VC specs but lower PPPM (400 W); SMA package (smaller footprint, higher RθJA = 140 °C/W). | Acceptable for lower-energy transients (e.g., board-level ESD); insufficient for IEC 61000-4-5 surges on long cables or inductive loads. | Choose SMAJ14A-E3/52 only for space-constrained designs with verified lower surge exposure and adequate thermal relief. |
Compared with SMBJ14A-E3/5B, SMBJ14CA-E3/5B enables bidirectional clamping at identical voltage thresholds but sacrifices polarity-specific optimization, while SMAJ14A-E3/52 reduces surge margin and thermal performance to fit smaller PCB area - neither offers pin-compatible replacement without layout or reliability review.
Availability
SMBJ14A-E3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, DC power rail protection, and telecom line interface applications requiring stable component supply, consistent RoHS compliance, and SMT-ready tape-and-reel packaging (3200 pcs per 13" reel).
Supply support for SMBJ14A-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and industrial-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, transportation, and infrastructure systems where robustness and long-term stability are non-negotiable.
FAQ
What is the maximum clamping voltage of SMBJ14A-E3/5B at its rated peak pulse current?
The SMBJ14A-E3/5B has a maximum clamping voltage (VC) of 23.2 V when subjected to its rated peak pulse current of 25.9 A using the 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream components. The SMBJ14A-E3/5B maintains this clamping performance across its specified operating temperature range.
Is SMBJ14A-E3/5B suitable for automotive applications requiring AEC-Q101 qualification?
No, SMBJ14A-E3/5B is a commercial-grade part with E3 suffix (RoHS-compliant) and is not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ14AHE3_B variant (HE3 suffix), which carries AEC-Q101 qualification and additional stress testing. The SMBJ14A-E3/5B should be used only in non-safety-critical industrial or telecom applications where automotive qualification is not mandated.
How does the thermal resistance of SMBJ14A-E3/5B affect its surge handling at elevated ambient temperatures?
The SMBJ14A-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W on standard 0.2" × 0.2" copper pads. At ambient temperatures above 25 °C, its peak pulse power rating must be derated per Figure 2 in the datasheet - e.g., at 75 °C ambient, maximum PPPM drops to ~420 W. This directly impacts sustained surge capability and must be accounted for in thermal layout design. The SMBJ14A-E3/5B remains functional but with reduced margin under hot operating conditions.
What is the polarity configuration of SMBJ14A-E3/5B, and how is it identified on the device?
SMBJ14A-E3/5B is a unidirectional TVS diode, meaning it conducts only when reverse-biased beyond its breakdown voltage. Polarity is indicated by a cathode band on the SMB package body - the banded end is the cathode and must be connected to the line being protected, while the anode connects to ground or the return path. This marking is consistent across all unidirectional SMBJ variants and is critical for correct circuit integration. The SMBJ14A-E3/5B does not function as intended if installed with reversed polarity.
Can SMBJ14A-E3/5B be used in bidirectional signal protection applications such as RS-485?
No, SMBJ14A-E3/5B is unidirectional and only clamps positive transients relative to ground; it cannot suppress negative-going surges on bidirectional lines. For RS-485 or other AC-coupled interfaces, a bidirectional variant like SMBJ14CA-E3/5B is required. Using SMBJ14A-E3/5B in such applications leaves the line vulnerable to negative transients and may cause damage. Always match TVS polarity to signal topology - the SMBJ14A-E3/5B is strictly for DC or single-polarity protection.
SMBJ14A-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ14A-E3/5B FAQ
1.How can I place an order for SMBJ14A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14A-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 SMBJ14A-E3/5B reliable?
The price and inventory of SMBJ14A-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 SMBJ14A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ14A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14A-E3/5B?
SMBJ14A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14A-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 SMBJ14A-E3/5B?
For technical support, including SMBJ14A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14A-E3/5B requirements.
6.How does Aetrix verify that SMBJ14A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ14A-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 SMBJ14A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ14A-E3/5B?
All SMBJ14A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14A-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 SMBJ14A-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ14A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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