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Vishay General Semiconductor - Diodes Division SMAJ14CAHE3_A/H
- Part No.:
- SMAJ14CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14CAHE3_A/H.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ14CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients 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 maximum clamping voltage (VC) at 17.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ14CAHE3_A/H datasheet, SMAJ14CAHE3_A/H pinout, SMAJ14CAHE3_A/H application, or SMAJ14CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low incremental surge resistance, and compatibility with automated SMT assembly on PCBs requiring robust ESD and lightning surge immunity per IEC 61000-4-2/4-5.
Technical Context
This device operates as a voltage-clamping protector: when transient voltage exceeds VWM = 14 V, it avalanches into low-impedance conduction to divert surge current away from downstream circuitry. Its bidirectional symmetry ensures identical clamping behavior in both polarities - critical for AC-coupled or floating signal lines like CAN bus stubs or sensor differential pairs.
Thermally, it exhibits RθJA = 120 °C/W (typ.) and RθJL = 30 °C/W (typ.), enabling reliable operation up to TJ = +150 °C. The glass-passivated junction and MSL Level 1 moisture sensitivity rating support lead-free reflow up to 260 °C peak, meeting J-STD-020 requirements for high-volume manufacturing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 12 V nominal systems. |
| VBR (min/max) | 15.6 V / 17.2 V at IT = 1 mA - tight breakdown tolerance ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 23.2 V at 17.2 A - clamping voltage under 10/1000 μs surge; limits stress on protected 15–20 V-rated components. |
| PPPM | 400 W - peak pulse power handling capacity; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 12 V rails. |
| IPPM | 17.2 A - maximum non-repetitive surge current; derived from VC and PPPM, confirms robust transient energy absorption. |
| TJ max. | +150 °C - maximum junction temperature; supports under-hood automotive environments and industrial enclosures. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Complies with UL 94 V-0 flammability rating and JESD 22-B102 solderability standards. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity surge) | One terminal of symmetrical PN junction; conducts during negative-going transients relative to cathode reference. |
| Cathode | Transient current entry (positive polarity surge) | Other terminal of symmetrical PN junction; conducts during positive-going transients; no band marking on bidirectional units. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout on differential or AC-coupled lines. |
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensors - ensures long-term reliability under thermal and mechanical stress. |
| 400 W peak pulse power | Handles IEC 61000-4-5 combination wave surges (1 kV/2 Ω) without degradation - protects against inductive switching and lightning-induced transients. |
| Low clamping ratio (VC/VWM ≈ 1.66) | Minimizes overvoltage exposure to downstream ICs - critical for safeguarding 16 V absolute maximum rated devices on 12 V buses. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without pre-baking - reduces manufacturing cost and cycle time in high-volume SMT lines. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply inputs to ECUs, lighting modules, and infotainment head units from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed upstream of LDOs and DC-DC converters to limit transient overvoltage. Use Value: Withstands 400 W surges while maintaining VC ≤ 23.2 V - prevents latch-up or gate oxide damage in downstream PMICs and microcontrollers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops or 0–10 V voltage outputs) of pressure/temperature sensors in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at connector interface to suppress ESD and cable discharge events. Use Value: Sub-100 pF junction capacitance at VWM avoids signal distortion; bidirectional symmetry accommodates floating sensor grounds. |
| Consumer USB Port ESD Protection | Telecom Data Line Surge Suppression |
|
Use Scenario: Safeguarding USB 2.0 D+/D− lines in portable chargers and docking stations against human-body-model (HBM) ESD. IC Role / Device Role / Timing Role: Fast-response TVS integrated near USB receptacle to shunt >8 kV contact discharge before reaching PHY IC. Use Value: <1 ps response time and 23.2 V clamping ensure USB transceivers (rated to 3.6 V) remain within safe operating area during ESD event. |
Use Scenario: Protecting RS-485/RS-232 transceiver pins in base station backhaul equipment exposed to induced lightning surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on line-side of isolation barrier to absorb multi-kA surge energy before isolation components. Use Value: 400 W rating and 17.2 A IPPM meet ITU-T K.20/21 recommendations for telecom central office protection zones. |
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 without AEC-Q101 qualification. | Lacks automotive reliability validation; suitable for consumer/industrial but not automotive OEM designs. | Select when AEC-Q101 is not required and cost optimization is prioritized over automotive qualification. |
| SMBJ14CAHE3_A/H | Same VWM, VBR, VC; higher PPPM = 600 W; larger SMB (DO-214AA) package with 2.54 mm lead pitch. | Higher surge margin for harsher environments; requires larger PCB footprint and different pad layout. | Choose when system-level surge test levels exceed IEC 61000-4-5 Level 4 and board space permits SMB footprint. |
Compared with SMAJ14CAHE3_A/H, SMAJ14CA-E3/61 offers identical clamping performance at lower qualification cost, while SMBJ14CAHE3_A/H trades compactness for 50 % higher surge power handling - enabling design flexibility between space-constrained automotive modules and ruggedized telecom interfaces.
Availability
SMAJ14CAHE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom data line protection requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMAJ14CAHE3_A/H 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, efficiency, and manufacturability.
The SMAJ series targets high-volume, space-constrained applications needing robust transient suppression - engineered for automotive, industrial, and computing markets where AEC-Q101 compliance and automated assembly are mandatory.
FAQ
What is the clamping voltage of SMAJ14CAHE3_A/H at its rated peak pulse current?
The SMAJ14CAHE3_A/H has a maximum clamping voltage (VC) of 23.2 V at its rated peak pulse current (IPPM) of 17.2 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and ensures protected circuits remain below critical overvoltage thresholds during transient events. The SMAJ14CAHE3_A/H achieves this with low dynamic impedance, minimizing voltage overshoot beyond VC.
Is SMAJ14CAHE3_A/H suitable for automotive applications?
Yes, SMAJ14CAHE3_A/H is AEC-Q101 qualified and specifically designed for automotive use - confirmed by Vishay's documentation listing "Automotive ordering code: base P/NHE3" and explicit qualification notes in the datasheet. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and extended temperature operation from –55 °C to +150 °C. The SMAJ14CAHE3_A/H meets requirements for engine control units, body electronics, and ADAS sensor modules where reliability under thermal cycling and vibration is essential.
How does the bidirectional configuration of SMAJ14CAHE3_A/H affect its circuit implementation?
The bidirectional configuration of SMAJ14CAHE3_A/H means it functions identically for positive and negative voltage transients - no polarity marking is present, and both terminals serve symmetrically as anode/cathode depending on surge polarity. This eliminates orientation constraints during placement and simplifies layout for AC-coupled signals, differential buses (e.g., CAN, RS-485), or floating sensor outputs. Unlike unidirectional TVS diodes, the SMAJ14CAHE3_A/H does not require a DC bias reference and can be placed directly across any two nodes needing symmetrical overvoltage protection.
What is the thermal resistance of SMAJ14CAHE3_A/H, and how does it impact power dissipation?
The SMAJ14CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, measured on standard 0.2″ × 0.2″ copper pads. These values define its steady-state power handling: at 25 °C ambient, its 3.3 W rated power dissipation (PD) corresponds to a ~400 °C junction rise - but since TVS devices operate only during transient events, thermal mass dominates. For repetitive surges, derating per Figure 2 in the datasheet applies; the SMAJ14CAHE3_A/H remains effective for duty cycles ≤ 0.01 %.
Does SMAJ14CAHE3_A/H meet industry standards for surge and ESD immunity?
Yes, SMAJ14CAHE3_A/H is engineered to meet key immunity standards: its 400 W peak pulse power rating aligns with IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge testing, and its sub-nanosecond response time satisfies IEC 61000-4-2 ESD requirements (±8 kV contact, ±15 kV air). Vishay also cites Underwriters Laboratory recognition (QVGQ2, file E136766) for both unidirectional and bidirectional devices. The SMAJ14CAHE3_A/H provides certified protection for designs targeting automotive EMC compliance (ISO 7637-2/3) and industrial immunity (IEC 61000-6-2).
SMAJ14CAHE3_A/H 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/H FAQ
1.How can I place an order for SMAJ14CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14CAHE3_A/H 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/H reliable?
The price and inventory of SMAJ14CAHE3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMAJ14CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14CAHE3_A/H?
SMAJ14CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14CAHE3_A/H 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/H?
For technical support, including SMAJ14CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ14CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ14CAHE3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ14CAHE3_A/H?
All SMAJ14CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14CAHE3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ14CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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