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Vishay General Semiconductor - Diodes Division SMAJ15CA-E3/5A
- Part No.:
- SMAJ15CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15CA-E3/5A.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,023
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Product details
Overview
SMAJ15CA-E3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 15 V standoff voltage (VWM), 16.7–18.5 V breakdown voltage (VBR) at 1 mA, 24.4 V maximum clamping voltage (VC) at 16.4 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform), commonly deployed to protect MOSFET gates, sensor interfaces, and automotive ECUs against ESD and load dump.
For engineers reviewing the SMAJ15CA-E3/5A datasheet, SMAJ15CA-E3/5A pinout, SMAJ15CA-E3/5A application, or SMAJ15CA-E3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.63), AEC-Q101 qualification eligibility (via HE3/HM3 variants), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping performance in forward and reverse directions - critical for AC-coupled signal lines and floating bus protection. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ns), while the low incremental surge resistance enables effective energy diversion during 8.3 ms surge events up to 40 A IFSM.
The device is rated for continuous operation from −55 °C to +150 °C, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting reliable performance under sustained power dissipation up to 3.3 W. Its MSL Level 1 rating (260 °C peak reflow) confirms suitability for standard lead-free assembly processes without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit of protected line's normal operating range. |
| VBR (min/max) | 16.7 V / 18.5 V at 1 mA - Confirmed breakdown threshold ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 24.4 V at 16.4 A - Clamped voltage seen by downstream circuitry during 400 W transient; determines maximum stress on protected IC. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy handling capacity; derates to 300 W above 78 V per spec. |
| IFSM | 40 A (8.3 ms half-sine) - Surge current withstand capability for unidirectional variants; applies to bidirectional under symmetrical fault conditions. |
| TJ max | +150 °C - Maximum junction temperature enabling use in under-hood automotive or industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height; compatible with standard pick-and-place feeders. |
Pinout & Package
Two-terminal bidirectional device in SMA (DO-214AC) package; no polarity marking required. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, with cathode/anode symmetry inherent to bidirectional construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive polarity) | Accepts surge current during positive-going transients; electrically identical to cathode in bidirectional mode. |
| Cathode | Transient current entry (negative polarity) | Accepts surge current during negative-going transients; functionally interchangeable with anode due to symmetrical structure. |
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. |
| 400 W peak pulse power | Robust suppression of ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges without degradation when mounted on 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio | VC/VWM = 1.63 - Minimizes overvoltage exposure to sensitive 15 V-rated components such as CAN transceivers or analog front-ends. |
| AEC-Q101 qualification path | HE3/HM3 suffix variants available - supports automotive-grade sourcing with validated reliability testing (HTOL, TC, UHAST). |
| MSL Level 1 | Reflow-compatible at 260 °C peak without baking - reduces manufacturing complexity and cost in high-volume SMT lines. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and temperature sensors in engine control modules exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor supply and ground, limiting transient excursions to ≤24.4 V during 100 V/50 ms load dump events. Use Value: Prevents latch-up or gate oxide damage in 16 V-tolerant ASICs while maintaining signal integrity through low capacitance (<100 pF at 0 V). | Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers subjected to inductive switching noise from solenoids and contactors. IC Role / Device Role / Timing Role: Parallel-connected TVS on each channel input, clamping fast-rising spikes (<1 ns rise time) before they reach optocoupler inputs. Use Value: Enables >100,000 surge cycles without parameter shift, reducing field failure rates in factory automation systems. |
| Consumer USB Port ESD Protection | Telecom Line Interface Protection |
Use Scenario: Secondary-level ESD protection on VBUS and D+/D− lines of USB 2.0 ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Downstream clamping device after primary polymer-based TVS, absorbing residual 8 kV HBM energy not shunted upstream. Use Value: Achieves IEC 61000-4-2 Level 4 compliance (±15 kV air, ±8 kV contact) with sub-100 ps response and <1 μA leakage at 15 V. | Use Scenario: Overvoltage protection on RS-485 transceiver terminals in base station remote radio units exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Differential-mode TVS pair (one per line) referenced to common ground, clamping common-mode transients up to 1 kV. Use Value: Maintains signal fidelity with <2 pF inter-pin capacitance and preserves DC common-mode range up to ±12 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15CA-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and thermal performance. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU WEEE, specific OEM specs). | Choose SMAJ15CA-M3/5A when environmental compliance requires halogen-free molding compound. |
| SMAJ15CA-HE3_A/I | AEC-Q101 qualified version with extended reliability testing (HTOL, TC, UHAST); same VWM, VBR, VC, PPPM. | Required for automotive safety-critical modules (e.g., ADAS camera power rails) where qualification evidence is mandatory. | Specify SMAJ15CA-HE3_A/I for automotive production programs requiring AEC-Q101 documentation and traceability. |
Compared with SMAJ15CA-E3/5A, the M3 variant adds halogen-free compliance without altering surge performance, while the HE3 variant delivers certified automotive reliability - enabling precise alignment with environmental mandates or functional safety requirements without redesigning PCB layout or protection topology.
Availability
SMAJ15CA-E3/5A is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and consumer USB port ESD mitigation requiring stable component supply across multi-year production cycles.
Supply support for SMAJ15CA-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 high-reliability, high-efficiency solutions.
The SMAJ series was engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping performance and long-term stability under repeated surge stress are essential.
FAQ
What is the maximum clamping voltage of the SMAJ15CA-E3/5A under a 10/1000 μs surge?
The SMAJ15CA-E3/5A exhibits a maximum clamping voltage (VC) of 24.4 V when subjected to its rated peak pulse current of 16.4 A using the standardized 10/1000 μs waveform. This value is measured at TA = 25 °C on 0.2" × 0.2" copper pads and represents the highest voltage imposed on protected circuitry during worst-case transient events - critical for verifying margin against downstream IC absolute maximum ratings.
Is SMAJ15CA-E3/5A suitable for automotive applications requiring AEC-Q101 qualification?
The SMAJ15CA-E3/5A itself is not AEC-Q101 qualified; however, Vishay offers the pin-compatible SMAJ15CA-HE3_A/I variant which carries full AEC-Q101 certification including HTOL, temperature cycling, and unbiased HAST testing. Engineers designing for automotive ECUs should specify the HE3 suffix version to meet OEM qualification requirements while retaining identical electrical behavior and PCB footprint.
How does the bidirectional nature of SMAJ15CA-E3/5A affect its placement on a PCB?
The SMAJ15CA-E3/5A has no polarity marking and functions identically in both directions, so orientation on the PCB is irrelevant - unlike unidirectional TVS diodes that require correct cathode alignment. This simplifies layout, eliminates assembly errors, and enables direct replacement in differential signal paths (e.g., RS-485, CAN FD) without modifying routing or silkscreen.
What is the thermal resistance and power derating behavior of SMAJ15CA-E3/5A?
SMAJ15CA-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. Its 3.3 W steady-state power dissipation rating derates linearly above 25 °C ambient, reaching zero at 150 °C junction temperature. Derating curves in Figure 2 of the datasheet confirm usable power drops to ~2.2 W at 75 °C ambient - essential for thermal design in enclosed enclosures.
Can SMAJ15CA-E3/5A be used for ESD protection per IEC 61000-4-2?
Yes, SMAJ15CA-E3/5A is widely applied for system-level ESD protection, particularly as secondary-stage clamping after polymer-based primary suppressors. Its <1 ns response time and low clamping voltage (24.4 V) enable compliance with IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) when properly laid out with short traces and adequate ground plane - verified in Vishay application note AN8001 for USB and sensor interface designs.
SMAJ15CA-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ15CA-E3/5A FAQ
1.How can I place an order for SMAJ15CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15CA-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 SMAJ15CA-E3/5A reliable?
The price and inventory of SMAJ15CA-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 SMAJ15CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ15CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15CA-E3/5A?
SMAJ15CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15CA-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 SMAJ15CA-E3/5A?
For technical support, including SMAJ15CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ15CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ15CA-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 SMAJ15CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ15CA-E3/5A?
All SMAJ15CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15CA-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 SMAJ15CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ15CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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