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Vishay General Semiconductor - Diodes Division SMAJ15CA-E3/61
- Part No.:
- SMAJ15CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15CA-E3/61.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ15CA-E3/61 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for clamping voltage transients on signal and power lines. It features a 15 V standoff voltage (VWM), 24.4 V maximum clamping voltage (VC) at 16.4 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line surge suppression.
For engineers reviewing the SMAJ15CA-E3/61 datasheet, SMAJ15CA-E3/61 pinout, SMAJ15CA-E3/61 application, or SMAJ15CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, SMA (DO-214AC) package compatibility with automated SMT assembly, AEC-Q101 qualification status, and thermal resistance (RθJA = 120 °C/W) for board-level thermal design validation.
Technical Context
This TVS diode operates symmetrically in both directions due to its CA suffix configuration, delivering identical breakdown (VBR min/max = 16.7 V / 18.5 V at 1 mA) and clamping behavior across polarity. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1 ns) to ESD and lightning-induced surges.
Rated for -55 °C to +150 °C operating junction temperature, it supports high-reliability environments including under-hood automotive electronics. The device meets MSL Level 1 per J-STD-020 and is RoHS-compliant (E3 suffix), with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 15 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 16.7–18.5 V at 1 mA - Confirmed minimum/maximum voltage at which device enters avalanche conduction; ensures predictable turn-on threshold. |
| VC (Clamping Voltage) | 24.4 V at 16.4 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case transient; determines downstream component stress level. |
| PPPM (Peak Pulse Power) | 400 W - Surge energy handling capacity under standard 10/1000 μs waveform; validates robustness against IEC 61000-4-5 Level 4 threats. |
| IPPM (Peak Pulse Current) | 16.4 A - Maximum non-repetitive surge current supported without degradation; used to size PCB trace width and layout clearance. |
| RθJA (Junction-to-Ambient) | 120 °C/W - Thermal resistance defining temperature rise per watt dissipated; critical for derating above 25 °C ambient. |
| TJmax | +150 °C - Absolute maximum junction temperature; sets upper limit for thermal design and reliability modeling. |
Pinout & Package
Package: SMA (DO-214AC) - low-profile surface-mount case with 0.208" × 0.157" footprint, UL 94 V-0 molding compound, and matte tin-plated leads. Bidirectional construction means no polarity marking; terminals are symmetrical anode/cathode pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Transient return path (bidirectional) | Provides symmetrical conduction path during positive or negative overvoltage events; connects to protected line or ground reference. |
| Cathode (Terminal 2) | Transient return path (bidirectional) | Electrically identical to Terminal 1 in CA devices; enables clamping regardless of voltage polarity across the device. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns - e.g., RS-485, CAN bus, or sensor differential pairs. |
| 400 W peak pulse power | Supports IEC 61000-4-5 surge immunity up to 4 kV (line-earth) in properly designed layouts with 0.2" × 0.2" copper pads per terminal. |
| Low clamping ratio (VC/VWM = 1.63) | Minimizes overvoltage exposure to downstream ICs - critical for protecting 3.3 V or 5 V logic interfaces with tight absolute maximum ratings. |
| AEC-Q101 qualified option | Available as SMAJ15CAHE3 variant; validated for automotive applications requiring zero defects and extended temperature cycling (-40 °C to +125 °C case). |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow without baking; compatible with standard lead-free reflow profiles up to 260 °C peak. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loop) from load dump and inductive kickback in engine control modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and chassis ground to clamp ±100 V transients within 1 ns. Use Value: Prevents damage to precision DACs and op-amps by limiting voltage excursion to ≤24.4 V while maintaining signal integrity during normal operation. |
Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to relay coil switching noise in factory automation cabinets. IC Role / Device Role / Timing Role: Parallel-connected TVS on each 24 V DC input to absorb repetitive 500 W surges from contactor bounce. Use Value: Extends mean time between failures (MTBF) by eliminating latch-up events in microcontroller GPIOs rated for only 36 V absolute maximum. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
|
Use Scenario: Shielding RS-232/RS-485 transceivers in base station backhaul equipment from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Differential-mode TVS pair across A/B lines with common-mode choke to suppress common- and differential-mode transients. Use Value: Maintains data integrity up to 10 Mbps by clamping transients before they distort signal edges - verified per ITU-T K.21 basic protection level. |
Use Scenario: Adding secondary surge protection on VBUS and D+/D− lines of USB 2.0 ports in smart home hubs subjected to user-handling ESD. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) TVS array (using discrete SMAJ15CA-E3/61 per line) to pass USB eye diagram compliance. Use Value: Passes IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) without signal attenuation or bit errors during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15CA-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package; same thermal and surge performance. | No functional difference; selected when halogen-free material compliance is mandated by OEM environmental policy (e.g., IPC-1752A). | Choose SMAJ15CA-M3/61 if halogen-free certification is required; otherwise, SMAJ15CA-E3/61 offers full commercial-grade compatibility. |
| SMAJ15A-E3/61 | Unidirectional version - cathode-marked, asymmetric clamping (clamps only negative transients relative to marked cathode). | Requires correct polarity placement; unsuitable for AC or floating signals unless circuit topology enforces fixed bias direction. | Select SMAJ15A-E3/61 only for DC-biased lines where polarity is guaranteed; SMAJ15CA-E3/61 eliminates orientation risk in differential or AC-coupled designs. |
Compared with SMAJ15CA-M3/61, the SMAJ15CA-E3/61 provides identical surge protection but uses standard RoHS-compliant materials instead of halogen-free compounds; versus SMAJ15A-E3/61, it delivers polarity-agnostic clamping essential for bidirectional interfaces like CAN or RS-485 without layout constraints.
Availability
SMAJ15CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface boards requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified alternatives.
Supply support for SMAJ15CA-E3/61 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 targets board-level transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where failure modes must be mitigated without adding complexity or cost to PCB layout.
FAQ
What is the clamping voltage of SMAJ15CA-E3/61 at its rated peak pulse current?
The SMAJ15CA-E3/61 has a maximum clamping voltage (VC) of 24.4 V when subjected to its rated peak pulse current of 16.4 A using the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and reflects worst-case voltage seen by protected circuitry during surge events - a critical parameter for ensuring downstream ICs remain within their absolute maximum voltage ratings. The SMAJ15CA-E3/61 maintains this clamping performance across its full operating temperature range.
Is SMAJ15CA-E3/61 suitable for automotive applications requiring AEC-Q101 qualification?
The SMAJ15CA-E3/61 itself is not AEC-Q101 qualified; however, Vishay offers the functionally identical SMAJ15CAHE3 variant (with HE3 suffix) that is fully AEC-Q101 qualified for automotive use. Engineers specifying SMAJ15CA-E3/61 for automotive designs should verify whether the application requires formal qualification - if so, SMAJ15CAHE3 must be selected. The SMAJ15CA-E3/61 remains appropriate for commercial and industrial applications where AEC-Q101 is not mandated.
How does the bidirectional nature of SMAJ15CA-E3/61 affect PCB layout compared to unidirectional TVS diodes?
Because SMAJ15CA-E3/61 is bidirectional, it has no polarity marking and can be placed in either orientation on the PCB - eliminating orientation errors during automated assembly and simplifying layout for differential or AC-coupled signal paths. In contrast, unidirectional variants like SMAJ15A-E3/61 require strict attention to cathode band alignment. This symmetry makes SMAJ15CA-E3/61 ideal for protecting balanced interfaces such as CAN, RS-485, or audio lines where voltage polarity reverses during normal operation.
What is the thermal resistance of SMAJ15CA-E3/61, and how does it impact power derating?
The SMAJ15CA-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on standard 0.2" × 0.2" copper pads. This value directly governs power derating: for example, at 75 °C ambient, the maximum allowable continuous power dissipation drops to approximately 2.1 W (calculated as (150 °C − 75 °C) / 120 °C/W). Engineers must apply this derating curve - shown in Figure 2 of the Vishay datasheet - when estimating long-term reliability under sustained leakage or repetitive surge conditions. The SMAJ15CA-E3/61's RθJA is consistent across all SMAJ-CA variants.
Can SMAJ15CA-E3/61 be used in parallel to increase surge current handling?
No - SMAJ15CA-E3/61 should not be paralleled to increase peak pulse current capacity. Due to manufacturing tolerances in breakdown voltage (VBR = 16.7–18.5 V), mismatched devices will share current unequally, causing one diode to absorb most of the surge energy and potentially fail prematurely. Vishay specifies single-device operation only. To handle higher surge currents, select a higher-power TVS family (e.g., SMBJ or SMCJ series) or redesign the protection network with upstream current-limiting impedance. The SMAJ15CA-E3/61 is optimized for discrete point-of-load protection, not system-level surge diversion.
SMAJ15CA-E3/61 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-E3/61 FAQ
1.How can I place an order for SMAJ15CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15CA-E3/61 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-E3/61 reliable?
The price and inventory of SMAJ15CA-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ15CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15CA-E3/61?
SMAJ15CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15CA-E3/61 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-E3/61?
For technical support, including SMAJ15CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ15CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ15CA-E3/61 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-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ15CA-E3/61?
All SMAJ15CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15CA-E3/61, 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-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ15CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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