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Vishay General Semiconductor - Diodes Division SMAJ15-E3/5A
- Part No.:
- SMAJ15-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15-E3/5A.pdf
- Description:
- TVS DIODE 15VWM 26.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,225
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Product details
Overview
SMAJ15-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features a 15 V stand-off voltage (VWM), 26.9 V maximum clamping voltage (VC) at 14.9 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ15-E3/5A datasheet, SMAJ15-E3/5A pinout, SMAJ15-E3/5A application, or SMAJ15-E3/5A equivalent, key selection criteria include its unidirectional polarity, 1.0 µA max reverse leakage at VWM, 16.7–20.4 V breakdown voltage range (VBR), 150 °C max junction temperature, and RoHS-compliant matte tin-plated leads solderable per J-STD-002.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and low dynamic impedance, enabling fast response (<1 ps) to ESD and surge events while maintaining low clamping ratio (VC/VBR ≈ 1.6).
The SMAJ15-E3/5A is rated for 40 A non-repetitive forward surge current (IFSM) under 8.3 ms half-sine wave, supports MSL Level 1 moisture sensitivity, and is qualified to JESD201 Class 1A whisker resistance - confirming suitability for automated SMT assembly and high-reliability commercial applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR min/max | 16.7 V / 20.4 V at 1.0 mA test current - Specifies guaranteed avalanche onset range for design margining. |
| VC @ IPPM | 26.9 V at 14.9 A - Peak clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level. |
| IPPM | 14.9 A - Peak surge current capability with 10/1000 µs waveform; directly tied to 400 W power rating. |
| ID @ VWM | 1.0 µA - Reverse leakage at stand-off voltage; ensures minimal standby power loss and signal integrity. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in high-ambient environments like motor drives or automotive under-hood modules. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs PCB thermal layout requirements. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, unidirectional configuration with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point during clamping | Connected to protected line (e.g., VIN or signal trace); must be routed with low-inductance path to ground reference. |
| Cathode | Avalanche conduction terminal (marked with band) | Connected to system ground or low-impedance return; polarity critical - reverse connection disables protection. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without derating below 78 V. |
| Glass-passivated chip junction | Ensures stable VBR over temperature and lifetime, with <±5% parametric drift across -55 °C to +150 °C. |
| MSL Level 1, 260 °C reflow compatible | Supports lead-free reflow soldering without preconditioning; eliminates moisture-related popcorning risk. |
| RoHS-compliant matte tin plating | Guarantees solderability per J-STD-002 and JESD22-B102; prevents intermetallic growth in long-life deployments. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., EFT bursts), improving clamping precision. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional TVS placed between driver output and ground to clamp negative transients before they reach sensitive CMOS inputs. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic interfaces by limiting voltage to ≤26.9 V during 100 A inductive switch-off events. |
Use Scenario: Safeguarding LIN bus transceivers and sensor supply rails from load dump and jump-start transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBAT-fed 5 V LDO input to absorb 35 V/100 ms load dump pulses per ISO 7637-2. Use Value: Maintains regulated output during surge by clamping input to 26.9 V, allowing downstream regulators to remain functional without shutdown. |
| Consumer Power Adapters | Industrial PLC I/O Modules |
|
Use Scenario: Secondary-side overvoltage suppression on USB-C PD adapter outputs exposed to cable ESD and hot-plug noise. IC Role / Device Role / Timing Role: Fast-response TVS on 5–20 V output rail to shunt ESD (IEC 61000-4-2 ±8 kV contact) before reaching USB controller. Use Value: Limits transient voltage to 26.9 V within <1 ps, preventing data corruption or port disablement in certified USB PD designs. |
Use Scenario: Input protection for 24 V digital input cards receiving signals from field sensors subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on dry-contact input terminals to divert 1 kV/500 A surge energy to chassis ground. Use Value: Withstands repeated 400 W surges per IEC 61000-4-4 (EFT), extending card service life in factory automation environments. |
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-E3/5A | Lower VBR range (16.7–18.5 V), tighter tolerance; 24.4 V clamping at 16.4 A. | Better suited for lower-voltage rails where tighter clamping margin is required (e.g., 3.3 V logic with 5 V tolerant I/O). | Select SMAJ15A-E3/5A when VBR consistency and reduced VC are prioritized over absolute surge current headroom. |
| SMBJ15-E3/52 | Same VWM/VC specs but in larger DO-214AA (SMB) package; 600 W peak power rating. | Higher thermal mass allows sustained surge handling in high-duty-cycle industrial controls; requires larger PCB footprint. | Choose SMBJ15-E3/52 when system-level surge testing exceeds 400 W or board layout permits larger package for improved reliability. |
Compared with SMAJ15-E3/5A, the SMAJ15A-E3/5A offers tighter VBR control and lower clamping voltage at cost of reduced IPPM, while SMBJ15-E3/52 trades compactness for higher surge endurance - making each optimal for distinct layout, thermal, and margining constraints.
Availability
SMAJ15-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and consumer power adapters requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ15-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and manufacturability.
The SMAJ series was developed for surface-mount transient suppression in space-constrained, high-volume applications - balancing robust surge capability, automated assembly compatibility, and commercial-grade qualification.
FAQ
What is the polarity configuration of SMAJ15-E3/5A?
SMAJ15-E3/5A is a unidirectional TVS diode, with the cathode identified by a visible band on the DO-214AC package. This polarity must be observed during PCB layout - connecting anode to the protected line and cathode to ground ensures proper clamping behavior during positive transients. Reversing polarity disables protection and may cause catastrophic failure under surge conditions.
Does SMAJ15-E3/5A meet automotive qualification standards?
SMAJ15-E3/5A is a commercial-grade part compliant with RoHS and MSL Level 1, but it is not AEC-Q101 qualified. For automotive applications requiring formal qualification, the SMAJ15HE3/5A variant (with HE3 suffix) is specified - it undergoes extended stress testing per AEC-Q101 and is rated for high-reliability use in body electronics and infotainment systems.
What is the maximum clamping voltage of SMAJ15-E3/5A under surge conditions?
The maximum clamping voltage of SMAJ15-E3/5A is 26.9 V, measured at 14.9 A peak pulse current (IPPM) using the standardized 10/1000 µs double-exponential waveform. This value represents the upper limit of voltage seen by downstream circuitry during worst-case surge events and is critical for ensuring protected ICs remain within their absolute maximum ratings.
Can SMAJ15-E3/5A be used in bi-directional protection circuits?
No - SMAJ15-E3/5A is strictly unidirectional and lacks symmetrical breakdown characteristics. For bi-directional transient suppression (e.g., AC lines or differential buses), the SMAJ15CA-E3/5A variant must be used. It features identical VWM and VC ratings in both directions and carries no polarity marking, enabling protection against positive and negative surges without external circuit modification.
What is the thermal resistance of SMAJ15-E3/5A, and how does it affect PCB layout?
SMAJ15-E3/5A 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. To maintain safe junction temperatures during repetitive surges, designers must provide adequate copper area and avoid thermal bottlenecks - reducing pad size or omitting thermal vias increases RθJA and risks exceeding the 150 °C TJ limit.
SMAJ15-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 26.9V
- Current - Peak Pulse (10/1000µs):
- 14.9A
- 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)
SMAJ15-E3/5A FAQ
1.How can I place an order for SMAJ15-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15-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 SMAJ15-E3/5A reliable?
The price and inventory of SMAJ15-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 SMAJ15-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ15-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15-E3/5A?
SMAJ15-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15-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 SMAJ15-E3/5A?
For technical support, including SMAJ15-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15-E3/5A requirements.
6.How does Aetrix verify that SMAJ15-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ15-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 SMAJ15-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ15-E3/5A?
All SMAJ15-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15-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 SMAJ15-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ15-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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