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Diodes Incorporated SMAJ30CA-13
- Part No.:
- SMAJ30CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30CA-13.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:6,879
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Product details
Overview
SMAJ30CA-13 from Diodes Incorporated is a 400W bi-directional transient voltage suppressor (TVS) diode in SMA package, designed for clamping ESD and surge transients on data lines and power rails. It features a 30V reverse standoff voltage (VRWM), 33.3–36.8V breakdown range (VBR @ 1mA), 48.4V max clamping voltage at 8.3A peak pulse current, and operates from –55°C to +150°C - used in industrial I/O protection and USB port surge suppression.
For engineers reviewing the SMAJ30CA-13 datasheet, SMAJ30CA-13 pinout, SMAJ30CA-13 application, or SMAJ30CA-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VCC, peak pulse current capability under 8.3ms half-sine stress, bi-directional symmetry for AC-coupled signal lines, and RoHS-compliant matte tin termination compatibility with lead-free reflow.
Technical Context
This bi-directional TVS diode uses glass-passivated junction construction to achieve fast response time (<1ps) and stable clamping performance across temperature. Its symmetrical avalanche breakdown enables identical clamping in both polarities, eliminating polarity concerns in differential or AC signal paths.
The device complies with IEC 61000-4-2 (ESD ±30kV air, ±30kV contact) and IEC 61000-4-5 (surge 4kV line-to-line, 6kV line-to-ground) when properly laid out. Thermal derating follows JEDEC-defined 8.3ms single half-sine waveform with ≤4 pulses/minute duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains 8.3ms surge events without failure under defined thermal conditions |
| Reverse Standoff Voltage (VRWM) | 30V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 33.3–36.8V @ 1mA - defines onset of avalanche conduction; tight tolerance ensures predictable turn-on |
| Max Clamping Voltage (VC) | 48.4V @ 8.3A - limits transient voltage seen by downstream circuitry during worst-case surge |
| Peak Pulse Current (Ipp) | 8.3A - maximum non-repetitive surge current supported at rated clamping voltage |
| Operating Temperature | –55°C to +150°C - supports deployment in automotive engine compartments and industrial PLCs |
| Leakage Current (IR) | 5.0µA @ 30V - low standby loss critical for battery-powered sensor nodes |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with UL 94V-0 flammability rating; cathode band omitted due to bi-directional construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bi-directional avalanche terminals | Identical clamping behavior in either polarity; no functional distinction between pins |
| Case | Non-electrical mechanical interface | Thermally conductive plastic body; no internal connection to die or leads |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable, repeatable avalanche characteristics over 1000+ surge cycles without parameter drift |
| Bi-directional symmetry | Eliminates orientation sensitivity during PCB placement - reduces assembly error risk |
| RoHS-compliant matte tin plating | Supports Pb-free reflow profiles (peak 260°C) without solder joint degradation |
| Low junction capacitance | ~25pF typical at 0V - preserves signal integrity on USB 2.0 and RS-485 lines |
Applications
| Industrial Sensor Interface | USB 2.0 Port Protection |
|---|---|
Use Scenario: Protecting 4–20mA analog input circuits in programmable logic controllers against induced lightning surges on field wiring. IC Role / Device Role / Timing Role: Bi-directional clamping element placed between signal line and ground, absorbing >4kV line-to-ground surges per IEC 61000-4-5. Use Value: Maintains 30V VRWM margin above 24V system rail while limiting clamped voltage to 48.4V - within absolute max rating of op-amps and ADC drivers. | Use Scenario: ESD and surge protection for D+ and D− lines in embedded host USB ports exposed to user-accessible connectors. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector, shunting transients before reaching USB transceiver PHY. Use Value: 25pF typical capacitance avoids signal rise-time degradation; 8.3A Ipp handles multiple contact ESD strikes per IEC 61000-4-2 Level 4. |
| Automotive Body Control Module | RS-485 Communication Bus |
Use Scenario: Safeguarding LIN bus transceivers connected to external harnesses subject to load dump and ISO 7637-2 pulse 5a. IC Role / Device Role / Timing Role: Secondary-level TVS on LIN signal path, working with primary LC filter to limit residual transients to <50V. Use Value: 150°C max junction temperature rating allows placement near heat-generating MCU or power regulators without derating. | Use Scenario: Transient suppression on differential A/B lines of industrial RS-485 networks running alongside AC power cables. IC Role / Device Role / Timing Role: Bi-directional clamp across A–B pair and individually to ground, suppressing common-mode and differential surges. Use Value: Symmetrical VBR ensures equal clamping on both polarities - prevents data corruption during asymmetric surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA-13 | 600W PPK, larger SMB package (4.58×3.94mm), higher Ipp (12.3A), same VRWM/VBR/VC | Better suited for higher-energy surges; requires more PCB area | Select when surge threat level exceeds 400W but layout allows SMB footprint |
| SMCJ30CA-13 | 1500W PPK, SMC package (7.11×6.22mm), Ipp = 31.0A, same VRWM/VBR/VC | Used in main power rail protection where energy levels exceed 400W | Choose for primary-level AC/DC input protection where space permits larger case |
Compared with SMBJ30CA-13 and SMCJ30CA-13, SMAJ30CA-13 delivers optimal balance of surge robustness, compact size, and cost for secondary-level signal line protection - especially where board space is constrained and threat level is defined by IEC 61000-4-2/4-5 Class 3–4.
Availability
SMAJ30CA-13 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB 2.0 port protection, and RS-485 communication buses requiring stable component supply and consistent RoHS-compliant manufacturing.
Supply support for SMAJ30CA-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The SMAJ series belongs to Diodes' transient voltage suppressor product line, engineered specifically for high-reliability, surface-mount surge and ESD protection in industrial, automotive, and communications equipment.
FAQ
What is the meaning of the "C" suffix in SMAJ30CA-13?
The "C" denotes bi-directional configuration: the device provides symmetrical clamping for positive and negative transients without polarity dependence. Unlike unidirectional versions, it lacks a cathode band marking and exhibits identical VBR and VC in both directions - essential for protecting AC-coupled or differential signal lines like RS-485 or USB D+/D−.
Can SMAJ30CA-13 be used in place of a unidirectional TVS?
Yes, but only if the circuit does not rely on DC blocking or forward conduction behavior. SMAJ30CA-13 conducts in both directions above its breakdown voltage, so it cannot replace a unidirectional TVS in applications requiring DC isolation or polarity-specific clamping - such as protecting a 3.3V microcontroller I/O pin referenced to ground with no negative excursions.
How does the 400W rating relate to real-world surge testing?
The 400W peak pulse power is specified for a single 8.3ms half-sine waveform at 25°C ambient, with ≤4 pulses per minute. In practice, this corresponds to IEC 61000-4-5 surge tests up to 4kV line-to-ground (with appropriate source impedance). Derating is required above 25°C ambient per Figure 1 in the datasheet.
Is SMAJ30CA-13 compatible with lead-free reflow processes?
Yes - it features matte tin plating compliant with RoHS Directive 2011/65/EU and qualified for standard Pb-free reflow profiles (peak temperature 260°C, 10-second duration). The SMA package's thermal mass and lead finish ensure reliable solder joint formation without voiding or dewetting under IPC-J-STD-020 moisture sensitivity Level 1 conditions.
SMAJ30CA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- SMA
SMAJ30CA-13 FAQ
1.How can I place an order for SMAJ30CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30CA-13 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-13 reliable?
The price and inventory of SMAJ30CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ30CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ30CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30CA-13?
SMAJ30CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30CA-13 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-13?
For technical support, including SMAJ30CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30CA-13 requirements.
6.How does Aetrix verify that SMAJ30CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ30CA-13 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-13 meets industry standards.
7.What is the process for return or replacement of SMAJ30CA-13?
All SMAJ30CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30CA-13, 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-13 part is unused and in its original packaging.
Return procedure for SMAJ30CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30CA-13 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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