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Vishay General Semiconductor - Diodes Division SMAJ14C-E3/5A
- Part No.:
- SMAJ14C-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14C-E3/5A.pdf
- Description:
- TVS DIODE 14VWM 25.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ14C-E3/5A from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on signal and power lines. It features a 14 V stand-off voltage (VWM), 25.8 V maximum clamping voltage (VC) at 15.5 A peak pulse current (IPPM), 400 W peak pulse power (10/1000 µs), and operates from −55 °C to +150 °C - used in automotive sensor line protection and industrial I/O interface surge suppression.
For engineers reviewing the SMAJ14C-E3/5A datasheet, SMAJ14C-E3/5A pinout, SMAJ14C-E3/5A application, or SMAJ14C-E3/5A equivalent, this page delivers verified electrical parameters, bi-directional TVS behavior, DO-214AC mechanical data, RoHS-compliant commercial-grade construction, and direct alternatives with clamping and leakage differences critical for ESD/lightning transient design.
Technical Context
The SMAJ14C-E3/5A is a bi-directional silicon avalanche diode optimized for fast response (<1 ps) to transient overvoltages. Its symmetrical breakdown characteristic enables identical clamping in both polarities, with VBR min/max of 15.6 V / 19.1 V at 1 mA test current and reverse leakage ≤1.0 µA at 14 V stand-off.
Thermal performance is defined by RθJA = 120 °C/W (typ.) and RθJL = 30 °C/W (typ.), supporting operation up to 150 °C junction temperature. It meets MSL level 1 per J-STD-020, with matte tin-plated leads solderable per J-STD-002 and JESD22-B102, and passes JESD201 class 1A whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - maximum continuous reverse operating voltage before conduction begins; defines safe signal line operating margin. |
| VC @ IPPM | 25.8 V - clamped voltage during 15.5 A 10/1000 µs surge; determines protected circuit's maximum stress level. |
| IPPM | 15.5 A - peak surge current capability under standard waveform; sets minimum trace width and PCB copper pad sizing. |
| PPPM | 400 W - peak pulse power rating (10/1000 µs); confirms suitability for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge events. |
| ID @ VWM | ≤1.0 µA - reverse leakage at 14 V; ensures minimal signal loading on high-impedance sensor or communication lines. |
| TJ Range | −55 °C to +150 °C - extended thermal range supports under-hood automotive and industrial control cabinet deployment. |
| Package | DO-214AC (SMA) - surface-mount outline with 5.0 × 5.0 mm copper pads recommended; compatible with automated pick-and-place. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with two terminals; no polarity marking for bi-directional types; cathode band absent; terminals are matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche junction | Either terminal serves as anode or cathode depending on transient polarity; no orientation required during placement. |
| Case | Non-conductive plastic body | No thermal or electrical connection to PCB ground plane; thermal path relies solely on soldered terminals and copper pads. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Identical VBR, VC, and IPPM in both directions - eliminates polarity concerns in AC-coupled or differential signal paths. |
| Low clamping ratio | VC/VWM = 1.84 - tight voltage limiting improves safety margin for 15 V-rated ICs and microcontrollers. |
| High surge robustness | 400 W peak pulse power (10/1000 µs) - withstands repeated lightning-induced surges per IEC 61000-4-5 without degradation. |
| RoHS-compliant commercial grade | E3 suffix indicates JESD201 class 1A whisker resistance and RoHS 2002/95/EC compliance - suitable for consumer and industrial applications. |
| MSL Level 1 moisture sensitivity | Unlimited floor life at ≤30 °C/60% RH - no baking required prior to reflow, reducing manufacturing overhead. |
Applications
| Automotive Sensor Protection | Industrial PLC Analog Input |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and temperature/pressure sensors from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional TVS placed across differential sensor lines or supply rails to clamp transients before they reach front-end amplifiers or ADCs. Use Value: Clamps 14 V nominal lines to ≤25.8 V during 15.5 A surges, preserving signal integrity and preventing latch-up in 16 V-tolerant analog front-ends. |
Use Scenario: Safeguarding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers against field wiring surges. IC Role / Device Role / Timing Role: Standoff-clamp device mounted at connector entry point to shunt induced transients away from precision op-amps and isolators. Use Value: 1.0 µA leakage at 14 V avoids offset errors in µA-level current loops; 25.8 V clamping protects 24 V rail-supplied instrumentation stages. |
| Telecom Line Interface | Consumer USB/Display Port ESD |
|
Use Scenario: Transient suppression on RS-485/RS-422 differential pairs in base station backhaul modules exposed to induced lightning energy. IC Role / Device Role / Timing Role: Paired bi-directional TVS devices across A/B lines to maintain common-mode immunity while clamping differential surges. Use Value: Symmetrical 15.6–19.1 V breakdown ensures balanced clamping, minimizing skew and preserving signal eye diagram integrity at 10 Mbps. |
Use Scenario: Board-level ESD protection for HDMI, USB 2.0, or DisplayPort source ports in set-top boxes and monitors. IC Role / Device Role / Timing Role: Low-capacitance TVS placed between high-speed signal lines and chassis ground to divert HBM ±8 kV discharges. Use Value: Junction capacitance <100 pF (measured at VWM) prevents signal rise-time degradation; 25.8 V clamping avoids damage to 3.3 V PHY drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14CA-E3/5A | Same VWM (14 V), identical VC (25.8 V), but marked "CA" per Vishay's bi-directional nomenclature - functionally identical to SMAJ14C-E3/5A per Doc. 88390 Table 1. | No functional difference; CA suffix is Vishay's standardized bi-directional designation; C and CA are cross-listed as equivalent in ordering tables. | Select SMAJ14CA-E3/5A when referencing Vishay's official bi-directional part numbering convention; both share same electrical specs and DO-214AC packaging. |
| SMCJ14CA | Same VWM (14 V) and bi-directional configuration, but SMC (DO-214AB) package - larger footprint, higher PPPM (1500 W), lower RθJA (60 °C/W). | Used where higher surge endurance or better thermal dissipation is required; not drop-in due to 7.11 × 6.22 mm vs. 4.5 × 2.79 mm SMA outline. | Choose SMCJ14CA only if system-level surge testing exceeds 400 W or board layout allows larger SMC package; otherwise SMAJ14C-E3/5A provides optimal size/power balance. |
Compared with SMAJ14C-E3/5A, SMAJ14CA-E3/5A is a naming-consistent variant with identical performance, while SMCJ14CA trades compactness for 3.75× higher pulse power and improved thermal resistance - making it suitable for harsher surge environments but requiring PCB redesign.
Availability
SMAJ14C-E3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial analog I/O protection, and telecom line surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ14C-E3/5A 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 application-specific optimization.
The SMAJ series is part of Vishay's TRANSZORB® TVS portfolio, engineered for fast-response transient suppression in automotive, industrial, and communications systems where compact size and repeatable clamping are critical.
FAQ
What is the exact breakdown voltage range for SMAJ14C-E3/5A?
The SMAJ14C-E3/5A has a guaranteed breakdown voltage (VBR) range of 15.6 V to 19.1 V at 1 mA test current (IT), per Vishay Document 88390, Table 1. This range reflects manufacturing tolerance and ensures reliable triggering above the 14 V stand-off voltage while maintaining margin below typical 24 V system rails. The SMAJ14C-E3/5A achieves this using a controlled silicon avalanche structure calibrated during wafer sort.
Is SMAJ14C-E3/5A unidirectional or bidirectional, and how is polarity identified?
SMAJ14C-E3/5A is a bi-directional TVS diode, meaning it clamps overvoltage transients equally in both polarities - no cathode band or polarity marking is present on the DO-214AC (SMA) package. This is confirmed by its "C" suffix (denoting bi-directional) and electrical data showing symmetric VBR, VC, and IPPM values. The SMAJ14C-E3/5A is functionally identical to SMAJ14CA-E3/5A per Vishay's documentation.
What is the maximum clamping voltage of SMAJ14C-E3/5A under surge conditions?
The SMAJ14C-E3/5A exhibits a maximum clamping voltage (VC) of 25.8 V when subjected to its rated 15.5 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per Fig. 1 and Fig. 3 in Vishay Document 88390 and defines the upper voltage limit imposed on protected circuits during transient events. The SMAJ14C-E3/5A maintains this clamping performance across its full operating temperature range.
Does SMAJ14C-E3/5A meet automotive qualification standards?
No - SMAJ14C-E3/5A carries the "E3" suffix, indicating RoHS-compliant commercial grade per JESD201 class 1A whisker testing, but it is not AEC-Q101 qualified. For automotive applications requiring qualification, the HE3-suffix variant (e.g., SMAJ14CAHE3/5A) must be selected, as explicitly stated in the "MECHANICAL DATA" section of Vishay Document 88390. The SMAJ14C-E3/5A is intended for industrial and consumer use.
What is the thermal resistance profile of SMAJ14C-E3/5A, and how does it affect PCB layout?
The SMAJ14C-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W, per Vishay Document 88390, Thermal Characteristics table. To achieve rated 400 W pulse power, the datasheet specifies mounting on 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal - undersized pads will cause excessive junction heating and derating. The SMAJ14C-E3/5A requires strict adherence to this pad layout for reliable surge handling.
SMAJ14C-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 25.8V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ14C-E3/5A FAQ
1.How can I place an order for SMAJ14C-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14C-E3/5A 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 SMAJ14C-E3/5A reliable?
The price and inventory of SMAJ14C-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14C-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ14C-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14C-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14C-E3/5A?
SMAJ14C-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14C-E3/5A 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 SMAJ14C-E3/5A?
For technical support, including SMAJ14C-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14C-E3/5A requirements.
6.How does Aetrix verify that SMAJ14C-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ14C-E3/5A 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 SMAJ14C-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ14C-E3/5A?
All SMAJ14C-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14C-E3/5A, 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 SMAJ14C-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ14C-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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