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Vishay General Semiconductor - Diodes Division SMAJ15AHE3_A/I
- Part No.:
- SMAJ15AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15AHE3_A/I.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,789
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Product details
Overview
SMAJ15AHE3_A/I 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 15 V standoff voltage (VWM), 16.7–18.5 V breakdown voltage (VBR) at 1 mA, 24.4 V clamping voltage (VC) at 16.4 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power rails.
For engineers reviewing the SMAJ15AHE3_A/I datasheet, SMAJ15AHE3_A/I pinout, SMAJ15AHE3_A/I application, or SMAJ15AHE3_A/I equivalent, key selection criteria include its unidirectional polarity, 15 V working voltage, 24.4 V clamping performance under 16.4 A surge, AEC-Q101 qualification status, and SMA package compatibility with automated SMT assembly.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during transient events, diverting surge current away from protected circuitry once reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage and low incremental surge resistance, while the unidirectional configuration provides forward conduction capability for DC-biased lines.
The device is rated for 400 W peak pulse power (derated to 300 W above 78 V), supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and maintains operation across –55 °C to +150 °C junction temperature range. Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 15 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC bias margin. |
| VBR (Breakdown Voltage) | 16.7–18.5 V at 1 mA - Voltage at which device enters avalanche conduction; ensures reliable triggering above normal operating rail. |
| VC (Clamping Voltage) | 24.4 V at 16.4 A (10/1000 μs) - Maximum voltage seen by protected circuit during rated surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W - Surge energy handling capacity under standardized 10/1000 μs waveform; validates protection against common inductive transients. |
| IPPM (Peak Pulse Current) | 16.4 A - Maximum transient current the device can safely shunt without degradation; directly tied to PCB trace and layout design. |
| TJmax | +150 °C - Maximum allowable junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; required for safety-critical vehicle subsystems. |
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 marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage event. |
| Anode (unbanded end) | Reference node | Typically connected to system ground or lower-potential rail; completes shunt path for surge current. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Validates protection against ISO 7637-2 Pulse 1/2a/5a-level transients in 12 V automotive systems. |
| AEC-Q101 qualification | Confirms compliance with automotive reliability standards including HTGB, TCT, and UHAST-required for engine control, ADAS, and body electronics. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving clamping precision for logic-level ICs. |
| Glass passivated junction | Ensures stable leakage current (<1 μA at VWM) and long-term parameter stability under thermal cycling and humidity stress. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture-induced damage or popcorn effect. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply lines feeding engine control units (ECUs) from load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and local regulator input. Use Value: Clamps transients up to 24.4 V at 16.4 A, preventing regulator latch-up and ensuring uninterrupted MCU operation during cranking and alternator faults. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode to signal, anode to ground) guarding against ESD and cable discharge events. Use Value: Sub-1 ns response and <1 μA leakage at 15 V ensure minimal signal distortion and no offset drift in precision measurement circuits. |
| Consumer Device USB Port Protection | Telecom Base Station DC Feeder Protection |
|
Use Scenario: Adding secondary overvoltage protection on VBUS line of USB-C ports in laptops and docking stations exposed to hot-plug surges. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB power delivery controller to absorb 100 V/1 A transients. Use Value: 15 V VWM allows full USB 2.0/3.0 VBUS tolerance (4.75–5.5 V) with 3× margin; 24.4 V VC prevents controller damage during ±15 kV ESD contact discharge. |
Use Scenario: Protecting -48 V DC feeder inputs in 5G remote radio units (RRUs) from lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: Unidirectional TVS configured cathode-to-line to clamp positive transients on negative-ground telecom systems. Use Value: 400 W rating and 150 °C max junction temperature support sustained operation in sealed, high-temperature outdoor enclosures with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A-E3/61 | Commercial-grade (non-AEC-Q101), same electrical specs and SMA package. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and lifecycle assurance is not critical. |
| SMAJ15CAHE3_A/I | Bidirectional variant; identical VWM, VBR, VC, and PPPM, but symmetric clamping in both polarities. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal may occur. | Choose only if bidirectional protection is needed; unidirectional SMAJ15AHE3_A/I offers lower leakage and simpler grounding in DC-biased rails. |
Compared with SMAJ15A-E3/61, SMAJ15AHE3_A/I adds AEC-Q101 qualification for automotive deployment, while SMAJ15CAHE3_A/I trades unidirectional optimization for polarity-agnostic clamping-neither is pin-compatible drop-in replacements without verifying board-level grounding and signal topology.
Availability
SMAJ15AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, consumer USB power delivery, and telecom DC feeder protection requiring stable component supply and AEC-Q101 compliance.
Supply support for SMAJ15AHE3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series delivers standardized, high-power TVS protection in compact surface-mount packages, engineered for automotive, industrial, and telecom systems demanding repeatable surge immunity and long-term parametric stability.
FAQ
What is the clamping voltage of the SMAJ15AHE3_A/I at its rated peak pulse current?
The SMAJ15AHE3_A/I has a maximum clamping voltage (VC) of 24.4 V at 16.4 A peak pulse current (10/1000 μs waveform). This value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ15AHE3_A/I maintains this clamping performance across its specified operating temperature range and is validated per IEC 61000-4-5 test methodology.
Is the SMAJ15AHE3_A/I suitable for automotive applications?
Yes, the SMAJ15AHE3_A/I is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature reverse bias, temperature cycling, and unbiased highly accelerated stress testing. This qualification confirms its suitability for automotive powertrain, chassis, and body electronics where reliability under extreme thermal and vibration conditions is mandatory. The SMAJ15AHE3_A/I is explicitly designated for automotive use via its "HE3" suffix.
What does the "HE3" suffix in SMAJ15AHE3_A/I indicate?
The "HE3" suffix in SMAJ15AHE3_A/I denotes RoHS-compliant construction with AEC-Q101 qualification. "H" indicates AEC-Q101 compliance, "E3" specifies RoHS-compliant matte tin plating and commercial-grade reliability. The "_A/I" portion identifies tape-and-reel packaging: "A" is the revision code, and "I" denotes 7500-unit reels on 13-inch diameter carriers. This coding aligns with Vishay's official ordering nomenclature in Document 88390.
How does the SMAJ15AHE3_A/I differ from the bidirectional SMAJ15CAHE3_A/I?
The SMAJ15AHE3_A/I is unidirectional, with cathode marked and optimized for DC-biased lines where surge polarity is known (e.g., 12 V battery rails). In contrast, SMAJ15CAHE3_A/I is bidirectional, offering symmetric clamping in both directions and no polarity marking-ideal for AC or floating signals like CAN or RS-485. Both share identical VWM, VBR, VC, and PPPM, but the SMAJ15AHE3_A/I exhibits lower reverse leakage (<1 μA at 15 V) due to its unidirectional architecture.
What is the thermal resistance of the SMAJ15AHE3_A/I, and how does it affect layout?
The SMAJ15AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard JEDEC test conditions and directly impacts maximum power dissipation in continuous operation. To maintain safe junction temperatures under repeated surges, PCB layout must provide adequate copper area and thermal vias-especially critical in automotive under-hood applications where ambient temperatures exceed 85 °C. The SMAJ15AHE3_A/I's RθJL of 30 °C/W further supports efficient heat transfer to PCB traces.
SMAJ15AHE3_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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- 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)
SMAJ15AHE3_A/I FAQ
1.How can I place an order for SMAJ15AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15AHE3_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 SMAJ15AHE3_A/I reliable?
The price and inventory of SMAJ15AHE3_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 SMAJ15AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ15AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15AHE3_A/I?
SMAJ15AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15AHE3_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 SMAJ15AHE3_A/I?
For technical support, including SMAJ15AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ15AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ15AHE3_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 SMAJ15AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ15AHE3_A/I?
All SMAJ15AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15AHE3_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 SMAJ15AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ15AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ15AHE3_A/I Tags
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