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Vishay General Semiconductor - Diodes Division SMAJ14AHE3/5A
- Part No.:
- SMAJ14AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14AHE3/5A.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,297
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Product details
Overview
SMAJ14AHE3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 14 V standoff voltage (VWM), 15.6–17.2 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤23.2 V at 17.2 A peak pulse current (IPPM). It delivers 400 W peak pulse power (10/1000 μs waveform) and is AEC-Q101 qualified for automotive applications.
For engineers reviewing the SMAJ14AHE3/5A datasheet, SMAJ14AHE3/5A pinout, SMAJ14AHE3/5A application, or SMAJ14AHE3/5A equivalent, this device is selected for its low clamping voltage, fast response time (<1 ps), and compatibility with automated SMT assembly - critical for protecting MOSFETs, ICs, and sensor signal lines in automotive ECUs and industrial control modules.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging an avalanche junction to divert surge energy away from protected circuitry once reverse voltage exceeds VBR. Its glass-passivated chip junction ensures stable leakage performance and long-term reliability under repetitive surge stress.
Thermal design is supported by RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, enabling effective heat dissipation during transient events. The device meets MSL Level 1 per J-STD-020 and supports peak forward surge current (IFSM) up to 40 A (8.3 ms half-sine).
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 below clamping threshold |
| VBR (Breakdown Voltage) | 15.6–17.2 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients |
| VC (Clamping Voltage) | ≤23.2 V at IPPM = 17.2 A - Actual maximum voltage seen by protected circuit during 400 W surge; enables safe IC-level protection |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Surge energy-handling capability under standard lightning/inductive-switching test waveform |
| IPPM (Peak Pulse Current) | 17.2 A - Peak current the device safely shunts without degradation; derived directly from VC and PPPM |
| ID (Max Reverse Leakage) | 1.0 μA at VWM - Ultra-low leakage preserves signal integrity and power efficiency in standby operation |
| TJmax | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band on body; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (cathode-biased side) | Connected to ground or lower-potential rail; completes clamping path during reverse surge |
| Cathode | Avalanche junction output terminal | Connected to protected line (e.g., CAN_H, sensor supply); carries surge current into ground via anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 surges without failure |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on downstream components compared to higher-ratio TVS devices |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; compatible with standard reflow profiles up to 260 °C peak |
| Glass-passivated junction | Ensures stable VBR and low leakage across temperature and lifetime; resists environmental degradation |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protects LIN bus transceivers and microcontroller I/O pins from load dump and inductive switching spikes in door module PCBs. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between LIN line and ground, activated within picoseconds of overvoltage event. Use Value: Limits voltage to ≤23.2 V during 17.2 A surge, preventing latch-up or gate oxide damage in 5 V-tolerant transceivers. |
Use Scenario: Shields analog outputs (4–20 mA loop drivers) and ADC inputs in factory-floor pressure/temperature sensors. IC Role / Device Role / Timing Role: Standoff-connected TVS on signal line, absorbing ESD and motor-drive coupling noise before reaching precision amplifier stages. Use Value: 1.0 μA leakage at 14 V avoids offset error in high-impedance sensor interfaces; 120 °C/W RθJA supports ambient temps up to +105 °C. |
| Consumer Appliance Motor Drive Board | Telecom Power Input Stage |
|
Use Scenario: Guards MCU GPIOs and gate drivers controlling BLDC fans in smart HVAC units against commutation spikes. IC Role / Device Role / Timing Role: Localized TVS adjacent to MOSFET source terminals, clamping shoot-through-induced transients. Use Value: 40 A IFSM rating handles repeated 8.3 ms inrush surges; RoHS-compliant HE3 suffix meets global regulatory requirements. |
Use Scenario: Installed at DC input of PoE-powered network switches to suppress induced surges from nearby AC wiring or lightning coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 48 V input rail, coordinated with upstream fuse and secondary TVS array. Use Value: 400 W PPPM sustains multiple 10/1000 μs events per IEC 61000-4-5; AEC-Q101 qualification adds margin for field-reliability validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A-E3/5A | Commercial-grade version; same electrical specs but not AEC-Q101 qualified | Limited to non-automotive industrial or consumer use where qualification is not mandated | Select when cost sensitivity outweighs automotive reliability requirements |
| SMBJ14AHE3/5A | Same VWM/VBR/VC, but SMB (DO-214AA) package - 2.5 mm wider, 0.5 mm taller, higher PPPM (600 W) | Better suited for higher-energy surges; requires larger PCB footprint and different pad layout | Choose when system-level surge testing exceeds 400 W or thermal margin is constrained |
Compared with SMAJ14A-E3/5A, the SMAJ14AHE3/5A adds AEC-Q101 assurance for automotive deployment; versus SMBJ14AHE3/5A, it trades 200 W pulse power headroom for space-constrained layouts - making SMAJ14AHE3/5A optimal for compact, qualified automotive nodes.
Availability
SMAJ14AHE3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and telecom power input protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ14AHE3/5A 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability transient suppression in space-constrained, high-surge environments - particularly targeting automotive, industrial, and communications systems demanding AEC-Q101 compliance and robust clamping performance.
FAQ
What is the clamping voltage of SMAJ14AHE3/5A at its rated peak pulse current?
The SMAJ14AHE3/5A clamps to a maximum of 23.2 V at its peak pulse current of 17.2 A (10/1000 μs waveform). This value is measured and guaranteed per Vishay's datasheet (Document Number: 88390, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during surge events. Designers use this parameter to verify margin against the absolute maximum ratings of downstream ICs.
Is SMAJ14AHE3/5A suitable for bidirectional signal line protection?
No - SMAJ14AHE3/5A is a unidirectional TVS diode, intended for DC-biased lines like power rails or single-ended digital signals referenced to ground. For bidirectional protection (e.g., RS-485, USB D+/D−), the bidirectional variant SMAJ14CAHE3/5A must be used. The "A" suffix in SMAJ14AHE3/5A explicitly denotes unidirectional polarity, with cathode marking indicating orientation during PCB layout.
Does SMAJ14AHE3/5A require derating above 25 °C ambient temperature?
Yes - SMAJ14AHE3/5A must be derated above TA = 25 °C per Figure 2 in the Vishay datasheet. Its peak pulse power drops linearly to 300 W at VWM ≥ 78 V and follows a defined thermal derating curve. At 85 °C ambient, PPPM is reduced to approximately 280 W for this 14 V device, requiring system-level surge validation under worst-case thermal conditions.
What does the "HE3" suffix signify in SMAJ14AHE3/5A?
The "HE3" suffix in SMAJ14AHE3/5A indicates RoHS-compliant construction with AEC-Q101 qualification - specifically denoting automotive-grade reliability testing (including temperature cycling, HTRB, and surge endurance). It also specifies matte tin plating per J-STD-002 and JESD22-B102, and whisker resistance per JESD201 Class 2. This distinguishes it from commercial-grade "E3" variants lacking automotive qualification.
Can SMAJ14AHE3/5A be used in place of SMAJ15AHE3/5A?
No - SMAJ14AHE3/5A and SMAJ15AHE3/5A have different standoff voltages (14 V vs. 15 V) and breakdown ranges (15.6–17.2 V vs. 16.7–18.5 V), resulting in distinct clamping behavior and system-level protection margins. Substitution requires verification of VWM margin, VC headroom, and surge test compliance. The SMAJ14AHE3/5A is not a drop-in replacement for SMAJ15AHE3/5A due to these parametric differences.
SMAJ14AHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 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)
SMAJ14AHE3/5A FAQ
1.How can I place an order for SMAJ14AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14AHE3/5A 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 SMAJ14AHE3/5A reliable?
The price and inventory of SMAJ14AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ14AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14AHE3/5A?
SMAJ14AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14AHE3/5A 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 SMAJ14AHE3/5A?
For technical support, including SMAJ14AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14AHE3/5A requirements.
6.How does Aetrix verify that SMAJ14AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ14AHE3/5A 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 SMAJ14AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ14AHE3/5A?
All SMAJ14AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14AHE3/5A, 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 SMAJ14AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ14AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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