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Vishay General Semiconductor - Diodes Division SMAJ14CAHE3_A/I
- Part No.:
- SMAJ14CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14CAHE3_A/I.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,782
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Product details
Overview
SMAJ14CAHE3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 14 V standoff voltage (VWM), 15.6–17.2 V breakdown range (VBR at 1 mA), 23.2 V maximum clamping voltage (VC) at 17.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMAJ14CAHE3_A/I datasheet, SMAJ14CAHE3_A/I pinout, SMAJ14CAHE3_A/I application, or SMAJ14CAHE3_A/I equivalent, this AEC-Q101-qualified TVS offers verified bidirectional clamping, low incremental surge resistance, and MSL Level 1 reflow compatibility - critical for high-reliability board-level ESD and lightning surge protection design.
Technical Context
This device operates as a voltage-clamped shunt protector: under transient overvoltage exceeding VWM = 14 V, it avalanches symmetrically in both directions to clamp the line at ≤23.2 V while diverting up to 17.2 A (10/1000 μs). Its glass-passivated junction ensures stable breakdown and fast response (<1 ns), with thermal resistance RθJA = 120 °C/W enabling operation from –55 °C to +150 °C junction temperature.
The SMAJ14CAHE3_A/I uses a unidirectional/bidirectional topology defined by package marking - "CA" suffix confirms bidirectional symmetry, eliminating polarity concerns in AC-coupled or differential signal paths. It meets UL 497B recognition (QVGQ2) and supports automated SMT placement on standard SMA (DO-214AC) footprints with matte tin leads compliant to J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V nominal systems. |
| VBR (min/max) | 15.6 V / 17.2 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on above system transients but below IC absolute max ratings. |
| VC @ IPPM | 23.2 V at 17.2 A - Clamped voltage during 400 W transient; guarantees protected ICs see <24 V stress during worst-case surges. |
| PPPM | 400 W (10/1000 μs) - Peak pulse power handling; sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| IFSM | 40 A (8.3 ms half-sine) - Surge current capability for unidirectional variants; confirms robustness against inductive switch-off events. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standard 2-pin surface-mount outline; 0.208" × 0.157" footprint compatible with IPC-7351B LCC2_SMA. |
Pinout & Package
Package: SMA (DO-214AC) - molded plastic case with matte tin-plated leads, MSL Level 1 rated (peak reflow 260 °C), UL 94 V-0 compliant. Bidirectional construction means no cathode/anode polarity marking; terminals are functionally symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as input/output node; identical electrical behavior in forward and reverse bias - no orientation required during placement. |
| Terminal 2 | Anode / Cathode (bidirectional) | Paired terminal completing the symmetrical TVS junction; connects across protected line (e.g., between signal and GND or differential pair). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and infotainment - supports PPAP and long-term reliability requirements. |
| 400 W peak pulse power | Clamps 10/1000 μs transients up to 400 W without degradation; exceeds ISO 7637-2 Pulse 5a (500 V/2 Ω) energy limits. |
| Low clamping ratio (VC/VBR ≈ 1.4) | 1.4× ratio ensures minimal overvoltage overshoot during clamping - critical for protecting 3.3 V/5 V logic and analog front-ends. |
| Fast response time (<1 ns) | Sub-nanosecond avalanche initiation prevents transient propagation into downstream circuitry before suppression engages. |
| MSL Level 1 reflow compatibility | Withstands JEDEC-standard reflow profiles up to 260 °C peak - eliminates moisture sensitivity handling and baking steps in production. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point, clamping fast-rising spikes before they reach interface ICs. Use Value: Maintains signal integrity under ISO 16750-2 load dump (120 V/1 s) and IEC 61000-4-2 ±15 kV contact discharge - preventing latch-up or permanent damage. |
Use Scenario: Safeguarding 24 V digital input channels and RS-485 transceivers in programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping element across input-to-ground and differential line pairs to absorb inductive kickback and lightning-induced common-mode noise. Use Value: Enables >100,000 surge cycles per channel without parameter drift - validated per IEC 61000-4-5 (4 kV line-earth, 2 kV line-line). |
| Telecom Line Interface | Consumer Power Adapter Output |
|
Use Scenario: Shielding Ethernet PHYs, DSL line drivers, and PoE injectors from induced surges on twisted-pair cabling in outdoor or shared infrastructure. IC Role / Device Role / Timing Role: Primary-level TVS on RJ45 jack side, working in concert with gas discharge tubes (GDTs) for staged protection. Use Value: Limits clamped voltage to <24 V during 10/700 μs telecom surges - preserving PHY compliance with IEEE 802.3af/at isolation margins. |
Use Scenario: Secondary-side overvoltage suppression on 5 V/9 V/12 V USB-C and barrel-jack outputs of wall adapters and power banks. IC Role / Device Role / Timing Role: Final-stage protector between DC-DC output and connector, absorbing capacitor discharge transients and hot-plug spikes. Use Value: Prevents false triggering of connected device overvoltage lockout (OVP) circuits - confirmed with <100 ps rise time transient testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14CA-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101 qualified); lead finish and tape/reel packaging differ (7" reel, 1800 pcs). | Lacks automotive qualification; not suitable for PPAP-controlled production or under-hood deployment. | Select when cost-sensitive industrial or consumer designs do not require AEC-Q101 validation or extended temperature assurance. |
| SMLJ14CAHE3_A/I | Higher 1500 W peak pulse power (10/1000 μs), same VWM/VC, but in larger SMC (DO-214AB) package - 2.5× PCB area and higher thermal mass. | Better suited for high-energy surge zones (e.g., AC mains input, motor drive terminals); over-spec'd for signal-line use. | Choose only if system-level testing shows SMAJ14CAHE3_A/I clamping margin is insufficient under repeated surge stress. |
Compared with SMAJ14CA-E3/61, the SMAJ14CAHE3_A/I adds AEC-Q101 qualification and 13" reel packaging for high-volume automotive builds; versus SMLJ14CAHE3_A/I, it trades surge capacity for compact size and lower parasitic inductance - optimizing for space-constrained signal integrity.
Availability
SMAJ14CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter outputs requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMAJ14CAHE3_A/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 high-reliability, AEC-Q qualified solutions for automotive and industrial markets.
The SMAJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for board-level transient immunity in harsh electromagnetic environments - balancing clamping performance, package scalability, and manufacturability.
FAQ
What does the "HE3_A/I" suffix mean in SMAJ14CAHE3_A/I?
The "HE3" denotes RoHS-compliant and AEC-Q101 qualified construction; "A" is the revision code; "I" specifies 13-inch tape-and-reel packaging with 7500 units per reel. This distinguishes SMAJ14CAHE3_A/I from commercial-grade variants like SMAJ14CA-E3/61 and confirms its suitability for automotive production environments where qualification and traceability are mandatory.
Is SMAJ14CAHE3_A/I unidirectional or bidirectional?
SMAJ14CAHE3_A/I is explicitly bidirectional, as indicated by the "CA" in its part number. Unlike "A"-suffixed unidirectional versions, it provides symmetrical clamping in both polarities - ideal for AC-coupled signals, differential buses (e.g., RS-485), and applications where polarity cannot be guaranteed during installation or fault conditions.
What is the maximum clamping voltage of SMAJ14CAHE3_A/I under surge conditions?
The maximum clamping voltage (VC) of SMAJ14CAHE3_A/I is 23.2 V at 17.2 A peak pulse current (10/1000 μs waveform). This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry will not experience more than 23.2 V during standardized surge events - critical for safeguarding 24 V-rated components and 3.3 V/5 V logic interfaces.
Can SMAJ14CAHE3_A/I replace SMAJ14AHE3_A/I in a design?
No - SMAJ14AHE3_A/I is unidirectional and requires correct cathode orientation; SMAJ14CAHE3_A/I is bidirectional with no polarity marking. Swapping them may cause improper clamping on negative transients in unidirectional circuits. The "CA" and "A" variants share VWM and package but differ fundamentally in conduction symmetry and application scope.
Does SMAJ14CAHE3_A/I meet UL recognition requirements?
Yes - SMAJ14CAHE3_A/I carries Underwriters Laboratories recognition under file E136766 for both unidirectional and bidirectional devices, complying with UL 497B for primary protectors. This certification validates its safety performance in telecom, industrial, and automotive surge protection applications where regulatory approval is required.
SMAJ14CAHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- 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):
- 17.2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ14CAHE3_A/I FAQ
1.How can I place an order for SMAJ14CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14CAHE3_A/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 SMAJ14CAHE3_A/I reliable?
The price and inventory of SMAJ14CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ14CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14CAHE3_A/I?
SMAJ14CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14CAHE3_A/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 SMAJ14CAHE3_A/I?
For technical support, including SMAJ14CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ14CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ14CAHE3_A/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 SMAJ14CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ14CAHE3_A/I?
All SMAJ14CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14CAHE3_A/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 SMAJ14CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ14CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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