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Vishay General Semiconductor - Diodes Division SMAJ64CA-E3/61
- Part No.:
- SMAJ64CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64CA-E3/61.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,100
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Product details
Overview
SMAJ64CA-E3/61 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for clamping voltage transients on power and signal lines. It features a 64 V standoff voltage (VWM), 71.1–78.6 V breakdown voltage (VBR) at 1 mA, 103 V maximum clamping voltage (VC) at 3.9 A peak pulse current, and 400 W peak pulse power rating with a 10/1000 μs waveform - used in automotive sensor protection, industrial I/O interfaces, and telecom line surge suppression.
For engineers reviewing the SMAJ64CA-E3/61 datasheet, SMAJ64CA-E3/61 pinout, SMAJ64CA-E3/61 application, or SMAJ64CA-E3/61 equivalent, key selection criteria include bidirectional clamping symmetry, low clamping ratio (VC/VWM = 1.61), AEC-Q101 qualification eligibility (via HE3 suffix variants), and compatibility with automated SMT assembly on DO-214AC footprints.
Technical Context
This device operates as a silicon avalanche diode with symmetrical bidirectional conduction, enabling transient suppression in AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports fast energy diversion during ESD or lightning-induced surges.
The SMAJ64CA-E3/61 delivers consistent clamping performance across -55 °C to +150 °C junction temperature range, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It meets UL 497B recognition (QVGQ2) and J-STD-020 MSL Level 1 moisture sensitivity classification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR min/max | 71.1 V / 78.6 V at 1 mA - Confirmed symmetric breakdown in both directions; ensures predictable turn-on under bidirectional transients |
| VC @ IPPM | 103 V at 3.9 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to ≤103 V |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; supports repetitive surge events at 0.01% duty cycle |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inrush or fault currents |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments |
| Package | SMA (DO-214AC) - Standardized 2-pin surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal design requirement |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional polarity - either terminal serves as cathode or anode depending on transient direction; no band marking required |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity constraints |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge events with margin when mounted on recommended 5.0 mm × 5.0 mm copper pads |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to protected ICs - critical for 64 V-rated systems like 48 V automotive electronics |
| AEC-Q101 qualification path | HE3/HM3 suffix variants are qualified for automotive applications; E3/61 variant shares identical die and construction |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without pre-baking; eliminates moisture-related popcorning risk |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and ground, clamping transients within nanoseconds to prevent latch-up or gate oxide damage. Use Value: Maintains signal integrity during 12 V/24 V system load dump events (up to 120 V, 400 ms) by limiting voltage to ≤103 V at peak surge current. |
Use Scenario: Safeguarding PLC digital input modules against induced surges from relay coil switching and motor drive noise in factory automation. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on 24 V DC input lines, shunting surge energy before it reaches optocoupler or microcontroller input pins. Use Value: Enables reliable operation under IEC 61000-4-4 EFT (4 kV) and IEC 61000-4-5 surge (2 kV) immunity testing without derating or additional filtering. |
| Telecom Line Protection | Consumer Power Adapter Input |
|
Use Scenario: Shielding Ethernet PHY front-end circuits and PoE injectors from lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Bidirectional clamp across differential pairs (e.g., TX+/TX−), referenced to chassis ground, responding in <1 ps to sub-nanosecond transients. Use Value: Prevents permanent damage to magnetics and PHY ICs during open-circuit lightning tests (IEC 61000-4-5, 10/700 μs) with clamping voltage held below 103 V. |
Use Scenario: Secondary-side overvoltage protection in AC/DC adapters for smart home devices, guarding against capacitor failure or regulator fault conditions. IC Role / Device Role / Timing Role: Fast-acting crowbar element across regulated 5 V/12 V outputs, triggered only during abnormal overvoltage (>64 V), not normal ripple. Use Value: Adds fail-safe shutdown capability without affecting steady-state regulation; withstands repeated 400 W surges without parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A-E3/61 | Unidirectional version; same VWM, VBR, VC, and PPPM, but asymmetric conduction - requires correct polarity placement. | Restricted to DC-coupled or grounded signal paths where polarity is fixed (e.g., 5 V supply rail to ground). | Select SMAJ64A-E3/61 only when circuit topology guarantees defined polarity and space allows orientation-aware layout. |
| SMBJ64CA-T | Same electrical specs but SMB (DO-214AA) package - 3.5 mm × 3.5 mm footprint, higher thermal resistance (150 °C/W), lower IPPM (3.5 A). | Used where board space is constrained but peak surge energy is lower; less effective in high-power industrial environments. | Choose SMBJ64CA-T only if PCB real estate is critical and thermal derating analysis confirms adequate margin at 3.5 A clamping level. |
Compared with SMAJ64CA-E3/61, the unidirectional SMAJ64A-E3/61 requires careful polarity alignment and offers no advantage in bidirectional systems, while the SMBJ64CA-T trades 11% lower clamping current and 25% higher thermal resistance for 30% smaller footprint - making SMAJ64CA-E3/61 optimal for balanced surge robustness and manufacturability in DO-214AC layouts.
Availability
SMAJ64CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line surge suppression requiring stable component supply, RoHS-compliant commercial-grade sourcing, and tape-and-reel delivery for SMT production.
Supply support for SMAJ64CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and automotive-grade qualification.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against ESD, EFT, and lightning surges is mandatory.
FAQ
What is the clamping voltage of SMAJ64CA-E3/61 at its rated peak pulse current?
The SMAJ64CA-E3/61 has a maximum clamping voltage (VC) of 103 V at its rated peak pulse current (IPPM) of 3.9 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ64CA-E3/61 maintains this clamping performance due to its low dynamic impedance and symmetrical bidirectional avalanche structure.
Is SMAJ64CA-E3/61 suitable for automotive applications requiring AEC-Q101 qualification?
The SMAJ64CA-E3/61 itself is a commercial-grade RoHS-compliant part (E3 suffix), but Vishay offers functionally identical AEC-Q101-qualified versions under the HE3 and HM3 suffixes (e.g., SMAJ64CAHE3_A). These share the same die, package, and electrical specifications, differing only in test documentation and traceability. For production automotive designs, specify the HE3 variant; the SMAJ64CA-E3/61 remains appropriate for prototyping, industrial, or cost-sensitive non-automotive use where qualification is not mandated.
How does the bidirectional nature of SMAJ64CA-E3/61 affect its PCB layout compared to unidirectional TVS diodes?
Unlike unidirectional TVS diodes such as SMAJ64A-E3/61, the SMAJ64CA-E3/61 has no polarity marking and functions identically regardless of orientation - eliminating the need for silkscreen polarity indicators or orientation-specific placement checks during SMT assembly. This simplifies layout, reduces assembly errors, and enables direct replacement in differential or AC-coupled signal paths. The SMAJ64CA-E3/61's symmetrical behavior also avoids unintended forward conduction issues that can occur with misoriented unidirectional parts.
What is the thermal performance limitation of SMAJ64CA-E3/61 in continuous operation?
The SMAJ64CA-E3/61 is rated for 3.3 W power dissipation at 50 °C ambient when mounted on an infinite heatsink, with a junction-to-ambient thermal resistance (RθJA) of 120 °C/W. In practical PCB layouts using the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, continuous power handling remains limited to ~0.5 W at 70 °C ambient to maintain TJ ≤ 150 °C. The SMAJ64CA-E3/61 is intended for transient, not steady-state, power dissipation - its 400 W rating applies only to short-duration surges.
Can SMAJ64CA-E3/61 be used to protect RS-485 communication lines?
Yes, SMAJ64CA-E3/61 is well-suited for RS-485 bus protection due to its bidirectional clamping, 64 V standoff voltage (compatible with ±12 V common-mode range), and fast response time (<1 ps). It is typically placed between each data line (A/B) and ground, or across the differential pair, to suppress ESD (IEC 61000-4-2, ±15 kV air), EFT (IEC 61000-4-4), and surge (IEC 61000-4-5) events. The SMAJ64CA-E3/61's low clamping ratio ensures receiver inputs remain within absolute maximum ratings even during worst-case transients.
SMAJ64CA-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):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 3.9A
- 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)
SMAJ64CA-E3/61 FAQ
1.How can I place an order for SMAJ64CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64CA-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 SMAJ64CA-E3/61 reliable?
The price and inventory of SMAJ64CA-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 SMAJ64CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ64CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64CA-E3/61?
SMAJ64CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64CA-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 SMAJ64CA-E3/61?
For technical support, including SMAJ64CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ64CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ64CA-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 SMAJ64CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ64CA-E3/61?
All SMAJ64CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64CA-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 SMAJ64CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ64CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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