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Vishay General Semiconductor - Diodes Division SMAJ30CA-M3/5A
- Part No.:
- SMAJ30CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30CA-M3/5A.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ30CA-M3/5A 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), 33.3–36.8 V breakdown voltage (VBR) at 1 mA, 48.4 V maximum clamping voltage (VC) 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 signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ30CA-M3/5A datasheet, SMAJ30CA-M3/5A pinout, SMAJ30CA-M3/5A application, or SMAJ30CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.61), AEC-Q101 qualification eligibility (via HM3 suffix), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its CA (bidirectional) configuration, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at VWM) and fast response time (<1.0 ns), critical for suppressing ESD and lightning-induced surges before sensitive circuitry is damaged.
The device delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) on standard 5.0 mm × 5.0 mm copper pads. Its unmarked SMA package indicates bidirectional polarity, distinguishing it from unidirectional variants marked with a cathode band.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 33.3 V / 36.8 V at 1 mA - Confirmed breakdown range ensures reliable turn-on during transient events without premature conduction. |
| VC @ IPPM | 48.4 V at 8.3 A - Clamping voltage limits stress on downstream components; clamping ratio of 1.61 supports robust overvoltage margin. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity suitable for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge testing. |
| IPPM | 8.3 A - Peak pulse current derived from PPPM/VC; validates survivability under standardized surge waveforms. |
| TJ max | +150 °C - Maximum junction temperature enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with J-STD-020 reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), bidirectional configuration with no polarity marking; terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| 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 relative to cathode side. |
| Cathode | Transient current entry (during negative half-cycle) | Second terminal of symmetrical PN junction; conducts when voltage exceeds –VBR relative to anode side. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or floating power rails without external polarity management. |
| 400 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive electronics with minimal board area. |
| Low clamping voltage (48.4 V) | Provides 18.4 V headroom below typical 65 V MOSFET drain-source breakdown, reducing risk of secondary failure in power stages. |
| AEC-Q101 qualified option (HM3 suffix) | Validated for automotive applications including engine control units and body electronics where reliability under thermal cycling is mandatory. |
| MSL Level 1 (260 °C peak) | Eliminates pre-bake requirement prior to reflow assembly, streamlining high-volume SMT manufacturing. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
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 transient clamp placed across differential signal pair or supply rail to limit voltage excursions within IC absolute maximum ratings. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V interface ICs by clamping transients to ≤48.4 V while maintaining signal integrity during normal operation. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against inductive kickback from solenoid valves and contactors. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing >100 A surge currents induced by relay switching, routed directly between field-side input and common return. Use Value: Extends mean time between failures (MTBF) by eliminating repeated overstress on optocoupler input diodes and upstream protection FETs. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from lightning-induced surges entering via unshielded twisted-pair cabling. IC Role / Device Role / Timing Role: Common-mode clamp across transformer secondary windings to suppress differential and common-mode transients simultaneously. Use Value: Maintains IEEE 802.3af/at compliance by limiting surge-induced voltage overshoot to <50 V, preventing PHY IC reset or damage. |
Use Scenario: Secondary-side overvoltage suppression in 12 V/19 V AC-DC adapters for laptops and monitors exposed to mains transients. IC Role / Device Role / Timing Role: Final-stage clamp placed between output capacitor and load connector to absorb residual spikes escaping primary-side regulation. Use Value: Avoids brownout or shutdown in connected devices by holding output voltage within ±10 % tolerance during 1 kV surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA-E3/5A | Same electrical specs; RoHS-compliant with lead finish meeting JESD 201 Class 2 whisker resistance, but not halogen-free. | Preferred for commercial-grade consumer electronics where halogen content is unrestricted. | Select when cost sensitivity outweighs halogen-free requirements and AEC-Q101 is not mandated. |
| SMAJ30A-M3/5A | Unidirectional variant with cathode band marking; identical VWM, VBR, VC, and PPPM, but only protects against negative transients unless paired with another device. | Used in DC power rail protection where polarity is fixed and space allows dual-device solutions. | Choose only for unidirectional DC systems; requires additional design validation for polarity alignment and asymmetric surge exposure. |
Compared with SMAJ30CA-M3/5A, the E3/5A alternative offers identical surge performance at lower material cost but lacks halogen-free certification, while the unidirectional SMAJ30A-M3/5A demands careful polarity routing and cannot protect AC or floating nodes without duplication - making the CA version the optimal choice for compact, polarity-agnostic designs.
Availability
SMAJ30CA-M3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line interfaces, and consumer power adapter outputs requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification readiness.
Supply support for SMAJ30CA-M3/5A 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 application-specific optimization.
The SMAJ series targets board-level transient protection across automotive, industrial, and communications markets, delivering standardized TVS performance in compact surface-mount packages with scalable power ratings and qualification pathways.
FAQ
What is the clamping voltage of SMAJ30CA-M3/5A at its rated peak pulse current?
The SMAJ30CA-M3/5A has a maximum clamping voltage (VC) of 48.4 V at 8.3 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per JEDEC standards and ensures predictable voltage limiting during surge events. The SMAJ30CA-M3/5A maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C, supporting robust protection in demanding environments.
Is SMAJ30CA-M3/5A suitable for automotive applications?
Yes - the SMAJ30CA-M3/5A uses the HM3 suffix, indicating halogen-free, RoHS-compliant construction and eligibility for AEC-Q101 qualification (when ordered with revision code, e.g., HM3_A). While the base part number itself is not pre-qualified, Vishay provides AEC-Q101 test reports for HM3-suffixed SMAJ devices, making SMAJ30CA-M3/5A a validated option for automotive body electronics, infotainment, and sensor modules.
How does the bidirectional design of SMAJ30CA-M3/5A affect PCB layout?
The SMAJ30CA-M3/5A has no polarity marking and functions identically in both directions, simplifying PCB layout by eliminating orientation constraints during automated placement. Unlike unidirectional variants (e.g., SMAJ30A-M3/5A), it requires no cathode alignment check, reduces assembly errors, and supports direct placement across AC-coupled lines or floating references - a key advantage in differential signaling and transformer-isolated interfaces.
What is the thermal resistance of SMAJ30CA-M3/5A, and how does it impact power dissipation?
The SMAJ30CA-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per JEDEC standards. At its rated 3.3 W steady-state power dissipation, this results in ~400 °C junction rise - confirming that the device is intended for transient-only duty cycles (0.01 % duty cycle), not continuous power handling. The SMAJ30CA-M3/5A relies on short-duration surge absorption rather than sustained thermal management.
Can SMAJ30CA-M3/5A replace SMAJ33CA-M3/5A in an existing design?
No - SMAJ30CA-M3/5A and SMAJ33CA-M3/5A have different standoff voltages (30 V vs. 33 V) and breakdown ranges (33.3–36.8 V vs. 36.7–40.6 V), resulting in distinct clamping behavior. Substituting SMAJ30CA-M3/5A may cause premature conduction in 33 V systems, increasing leakage and self-heating. The SMAJ30CA-M3/5A is only interchangeable with other 30 V-rated SMAJ CA variants, not higher-voltage family members.
SMAJ30CA-M3/5A 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-M3/5A FAQ
1.How can I place an order for SMAJ30CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30CA-M3/5A 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-M3/5A reliable?
The price and inventory of SMAJ30CA-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ30CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ30CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30CA-M3/5A?
SMAJ30CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30CA-M3/5A 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-M3/5A?
For technical support, including SMAJ30CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ30CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ30CA-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ30CA-M3/5A?
All SMAJ30CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30CA-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ30CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30CA-M3/5A Tags
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