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Vishay General Semiconductor - Diodes Division SMAJ30CA-E3/5A
- Part No.:
- SMAJ30CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30CA-E3/5A.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:12,083
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Product details
Overview
SMAJ30CA-E3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 30 V standoff voltage (VWM), 48.4 V maximum clamping voltage at 8.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ30CA-E3/5A datasheet, SMAJ30CA-E3/5A pinout, SMAJ30CA-E3/5A application, or SMAJ30CA-E3/5A equivalent, key selection criteria include bidirectional clamping capability, low incremental surge resistance, AEC-Q101 qualification eligibility, RoHS compliance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal lines without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while the SMA package supports high thermal dissipation via low RθJL (30 °C/W).
The device complies with ANSI/IEEE C62.35 surge standards and delivers repeatable clamping performance under repetitive 0.01% duty cycle pulses. At 30 V standoff, it maintains ≤1.0 μA reverse leakage, and its temperature coefficient of VBR is +0.099 %/°C - critical for stable operation across -55 °C to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - maximum continuous reverse operating voltage before clamping begins |
| VBR Min/Max | 33.3 V / 36.8 V at 1.0 mA - guaranteed breakdown threshold range for reliable transient detection |
| VC @ IPPM | 48.4 V at 8.3 A - clamped voltage during 10/1000 μs surge, limiting downstream stress |
| PPPM | 400 W - peak pulse power handling with standard 10/1000 μs waveform (derated above 78 V) |
| ID @ VWM | ≤1.0 μA - ultra-low leakage preserves signal integrity in high-impedance circuits |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 0.208" x 0.157" footprint |
| Operating Temp | -55 °C to +150 °C - suitable for under-hood automotive and industrial environments |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-002 solderability requirements. Polarity marking: none for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (during positive half-cycle) | One terminal of symmetrical PN junction; conducts when voltage exceeds +VBR |
| Anode | Transient current exit (during negative half-cycle) | Same physical terminal serves as cathode reference during reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal lines without polarity constraints |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V/24 V systems with margin |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio suppressors |
| AEC-Q101 qualification option | HE3/HM3 variants available for automotive applications requiring reliability validation |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced failure |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, responding within <1 ns to limit excursion beyond 48.4 V. Use Value: Prevents latch-up or gate oxide damage in microcontrollers and signal-conditioning amplifiers exposed to ±100 V transients. |
Use Scenario: Safeguarding 24 V digital input modules against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor across input terminals, absorbing 400 W pulses without degradation over 10⁵ events. Use Value: Eliminates need for external series impedance or RC snubbers while maintaining EMC immunity per IEC 61000-4-4/5. |
| Consumer Power Adapter ESD Protection | Telecom Line Card Surge Suppression |
Use Scenario: Clamping fast ESD events (IEC 61000-4-2 ±8 kV contact) on USB, HDMI, or DC input rails of wall adapters. IC Role / Device Role / Timing Role: First-line defense at connector entry point, shunting >15 kV HBM-equivalent transients to ground. Use Value: Achieves system-level ESD robustness without increasing PCB area or BOM count versus discrete Zener+capacitor solutions. |
Use Scenario: Protecting Ethernet PHY or DSL line drivers from lightning-induced surges on twisted-pair telecom lines. IC Role / Device Role / Timing Role: Paired bidirectional TVS on differential pair (e.g., TX+/TX−), clamping common-mode transients to <50 V. Use Value: Maintains signal integrity below 100 MHz while meeting GR-1089-CORE Level 3 surge requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package | No functional difference; selected where halogen-free material compliance is mandated | Choose for green manufacturing programs requiring IEC 61249-2-21 compliance |
| SMAJ33CA-E3/5A | Higher 33 V standoff voltage; VBR min/max = 36.7 V / 40.6 V; VC = 53.3 V at 7.5 A | Provides tighter margin above 30 V nominal rail but reduces clamping headroom | Select when protecting 3.3 V or 5 V logic rails referenced to higher-voltage domains |
Compared with SMAJ30CA-E3/5A, the M3 variant offers identical protection performance with halogen-free packaging, while SMAJ33CA-E3/5A trades lower clamping voltage margin for increased standoff headroom - critical when system operating voltage tolerances exceed ±10%.
Availability
SMAJ30CA-E3/5A is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and consumer power adapter designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ30CA-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, power efficiency, and automotive-grade qualification.
The SMAJ series is engineered for robust transient suppression in harsh environments, targeting design-in across automotive, industrial automation, and telecom infrastructure where failure modes must be mitigated without compromising signal fidelity.
FAQ
What is the clamping voltage of SMAJ30CA-E3/5A at its rated peak pulse current?
The SMAJ30CA-E3/5A exhibits a maximum clamping voltage (VC) of 48.4 V when subjected to its specified peak pulse current of 8.3 A using the standard 10/1000 μs waveform. This value is measured under defined test conditions per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for protected circuitry. The SMAJ30CA-E3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ30CA-E3/5A suitable for automotive applications?
SMAJ30CA-E3/5A itself is commercial-grade, but the same device in HE3 or HM3 suffix (e.g., SMAJ30CAHE3_A/I) is AEC-Q101 qualified for automotive use. The SMAJ30CA-E3/5A shares identical electrical characteristics and package dimensions, allowing direct design reuse - only the qualification and material compliance differ. For non-automotive industrial or consumer use, SMAJ30CA-E3/5A is fully appropriate.
How does the bidirectional configuration of SMAJ30CA-E3/5A affect its circuit implementation?
The bidirectional configuration of SMAJ30CA-E3/5A means it functions identically in both polarities - no cathode band marking is present, and it clamps transients exceeding ±33.3 V symmetrically. This eliminates orientation concerns during placement and enables single-device protection of AC-coupled lines, differential buses (e.g., RS-485), or floating grounds. The SMAJ30CA-E3/5A thus simplifies layout and reduces BOM complexity versus unidirectional alternatives requiring careful polarity alignment.
What is the thermal resistance profile of SMAJ30CA-E3/5A, and how does it impact PCB layout?
SMAJ30CA-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads. To sustain repetitive surges, designers should maximize copper area connected to both terminals and avoid narrow traces. The SMAJ30CA-E3/5A's low RθJL enables effective heat transfer to the PCB, making thermal relief patterns unnecessary for most 1–2 Hz surge events.
Does SMAJ30CA-E3/5A meet RoHS and REACH requirements?
Yes, SMAJ30CA-E3/5A is RoHS-compliant per EU Directive 2011/65/EU and meets applicable REACH SVHC thresholds. The "E3" suffix explicitly denotes commercial-grade RoHS compliance, including lead-free matte tin plating and halogen-free molding compound. Full compliance documentation, including substance declarations and test reports, is available through Vishay's official product portal for the SMAJ30CA-E3/5A.
SMAJ30CA-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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- 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)
SMAJ30CA-E3/5A FAQ
1.How can I place an order for SMAJ30CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30CA-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 SMAJ30CA-E3/5A reliable?
The price and inventory of SMAJ30CA-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 SMAJ30CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ30CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30CA-E3/5A?
SMAJ30CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30CA-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 SMAJ30CA-E3/5A?
For technical support, including SMAJ30CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ30CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ30CA-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 SMAJ30CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ30CA-E3/5A?
All SMAJ30CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30CA-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 SMAJ30CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ30CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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