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Vishay General Semiconductor - Diodes Division SMAJ30A-E3/5A
- Part No.:
- SMAJ30A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30A-E3/5A.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,490
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Product details
Overview
SMAJ30A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 30 V stand-off voltage (VWM), 33.3–36.8 V breakdown voltage (VBR) at 1 mA test current, 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.
For engineers reviewing the SMAJ30A-E3/5A datasheet, SMAJ30A-E3/5A pinout, SMAJ30A-E3/5A application, or SMAJ30A-E3/5A equivalent, key selection criteria include clamping performance under 8.3 A surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device placed in parallel with circuit nodes requiring transient immunity-typically across power rails or signal lines feeding ICs, MOSFETs, or sensor interfaces. Its glass-passivated junction enables fast response time (<1 ns), low incremental surge resistance, and stable clamping behavior during repetitive 10/1000 μs transients at 0.01% duty cycle.
The SMAJ30A-E3/5A is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020, and supports peak forward surge current of 40 A (8.3 ms half-sine). Its unidirectional configuration requires cathode-band orientation during PCB layout, and it delivers 3.3 W steady-state power dissipation on infinite heatsink at 50 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 33.3–36.8 V at 1 mA - Voltage at which device transitions from high-impedance to low-impedance clamping state; ensures reliable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 48.4 V at IPPM = 8.3 A - Maximum voltage seen by protected circuit during 10/1000 μs transient; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W - Surge energy handling capability with standard 10/1000 μs waveform; validates robustness against common industrial and automotive transients. |
| ID (Reverse Leakage) | 1.0 μA at VWM - Low leakage preserves system efficiency and prevents false triggering in low-power circuits. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard PCB pad layout; informs derating requirements above 25 °C ambient. |
| Polarity | Unidirectional - Cathode marked by band; must be oriented correctly to protect against positive-going transients on anode-to-cathode path. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); cathode band identifies terminal polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (for positive transients) | Connected to line or rail being protected; conducts surge current toward cathode during overvoltage event. |
| Cathode | Transient current exit point (marked by band) | Connected to ground or lower-potential reference; establishes unidirectional clamping direction and defines VWM polarity. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Validates protection against IEC 61000-4-5 Level 3/4 surges without degradation under repetitive stress. |
| Fast response time (<1 ns) | Ensures clamping activation before transient energy damages downstream CMOS or logic-level inputs. |
| Glass passivated chip junction | Provides stable VBR tolerance, low leakage drift over temperature, and long-term reliability in humid environments. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture-induced popcorning or delamination. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental compliance requirements while maintaining full electrical specification performance. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V CAN bus power supply lines in vehicle ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input to clamp spikes up to 48.4 V and divert >8 A surge current to chassis ground. Use Value: Prevents damage to upstream regulators and downstream microcontrollers during ISO 7637-2 Pulse 5a events without affecting normal 24 V operation. |
Use Scenario: Shielding analog output lines of pressure sensors in factory automation PLC modules from ESD and relay-switching noise. IC Role / Device Role / Timing Role: TVS mounted directly at connector interface to shunt transients before they reach op-amp input stages or ADC front-end. Use Value: Maintains signal integrity with <1 μA leakage at 30 V, enabling sub-mV measurement accuracy in 4–20 mA loop systems. |
| Consumer USB Power Delivery Protection | Telecom Base Station DC Input Protection |
|
Use Scenario: Safeguarding USB-C PD controller ICs and buck converters in portable chargers against hot-plug voltage overshoot and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between input capacitor and PD controller VBUS pin to limit transient excursions to ≤48.4 V. Use Value: Enables compliance with USB-IF ESD immunity requirements while supporting 3 A continuous charging current without thermal saturation. |
Use Scenario: Guarding primary 48 V DC input of telecom remote radio units against lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: First-stage TVS in multi-tier protection scheme, absorbing initial 400 W surge before MOV or GDT secondary clamping activates. Use Value: Provides precise 30 V standoff and repeatable 48.4 V clamping to avoid nuisance tripping of upstream fuses during marginal overvoltage conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No functional difference; selected when halogen-free material compliance is required for end-product certification. | Choose SMAJ30A-M3/5A if IPC-1752 or EU Green Procurement mandates halogen-free bill-of-materials. |
| SMAJ30AHE3_A/I | AEC-Q101 qualified version with same VWM, VBR, VC, and PPPM ratings; differs only in qualification testing and traceability. | Required for automotive-grade designs where component-level reliability validation per AEC-Q101 is mandatory. | Select SMAJ30AHE3_A/I for automotive OEM or Tier-1 applications needing certified qualification evidence and extended temperature validation. |
Compared with SMAJ30A-M3/5A and SMAJ30AHE3_A/I, the SMAJ30A-E3/5A offers standard commercial-grade performance with RoHS compliance but no halogen-free or automotive qualification-making it optimal for cost-sensitive industrial and consumer designs where those attributes are not mandated.
Availability
SMAJ30A-E3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, consumer USB power delivery protection, and telecom base station DC input protection requiring stable component supply and consistent parametric performance across production lots.
Supply support for SMAJ30A-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, TVS devices, and optoelectronics with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and communications systems where space, thermal performance, and surge immunity are critical.
FAQ
What is the clamping voltage of SMAJ30A-E3/5A at its rated peak pulse current?
The SMAJ30A-E3/5A has a maximum clamping voltage (VC) of 48.4 V at its specified peak pulse current (IPPM) of 8.3 A using the 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ30A-E3/5A maintains this clamping performance consistently across its qualified operating temperature range.
Is SMAJ30A-E3/5A suitable for automotive applications?
The SMAJ30A-E3/5A is a commercial-grade part and is not AEC-Q101 qualified. For automotive use, Vishay offers the SMAJ30AHE3_A/I variant, which undergoes full AEC-Q101 stress testing. While the SMAJ30A-E3/5A shares identical electrical parameters with the HE3 version, it lacks the qualification documentation and extended reliability validation required for automotive OEM deployments. Always specify SMAJ30AHE3_A/I for automotive applications.
What does the "E3/5A" suffix mean in SMAJ30A-E3/5A?
The "E3" suffix indicates RoHS-compliant, commercial-grade construction with matte tin-plated leads, while "/5A" denotes packaging in 13-inch diameter plastic tape and reel containing 7500 units. This format supports high-volume automated SMT assembly. The SMAJ30A-E3/5A is distinct from M3 (halogen-free) and HE3 (AEC-Q101 qualified) variants, all sharing the same core TVS die and SMA package dimensions.
How does SMAJ30A-E3/5A compare to SMAJ33A in terms of voltage ratings?
The SMAJ30A-E3/5A has a 30 V stand-off voltage (VWM) and 33.3–36.8 V breakdown range, whereas SMAJ33A specifies 33 V VWM and 36.7–40.6 V VBR. This 3 V higher VWM in SMAJ33A allows operation in slightly higher nominal voltage systems, but results in a higher clamping voltage (53.3 V vs. 48.4 V), increasing stress on protected components. Select SMAJ30A-E3/5A when tighter clamping is prioritized over margin above nominal rail voltage.
Can SMAJ30A-E3/5A be used in bidirectional protection circuits?
No-SMAJ30A-E3/5A is strictly unidirectional, as indicated by the "A" suffix and cathode band marking. Bidirectional operation requires the "CA" suffix (e.g., SMAJ30CA), which provides symmetrical clamping in both polarities. Using SMAJ30A-E3/5A in bidirectional configurations risks failure during negative transients, as it conducts freely in reverse bias beyond its breakdown voltage. Always match suffix to system polarity requirements.
SMAJ30A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ30A-E3/5A FAQ
1.How can I place an order for SMAJ30A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30A-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 SMAJ30A-E3/5A reliable?
The price and inventory of SMAJ30A-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 SMAJ30A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ30A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30A-E3/5A?
SMAJ30A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30A-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 SMAJ30A-E3/5A?
For technical support, including SMAJ30A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30A-E3/5A requirements.
6.How does Aetrix verify that SMAJ30A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ30A-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 SMAJ30A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ30A-E3/5A?
All SMAJ30A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30A-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 SMAJ30A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ30A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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