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Diodes Incorporated SMAJ30A-13-F
- Part No.:
- SMAJ30A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30A-13-F.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:544,079
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Product details
Overview
SMAJ30A-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 30V reverse standoff voltage (VRWM), 33.3–36.8V breakdown voltage (VBR), 48.4V maximum clamping voltage (VC) at 8.3A peak pulse current, and operates across –55°C to +150°C. Used in automotive infotainment power rails to absorb ISO 7637-2 load dump transients.
For engineers reviewing the SMAJ30A-13-F datasheet, SMAJ30A-13-F pinout, SMAJ30A-13-F application, or SMAJ30A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, peak pulse current handling under 8.3ms surge waveforms, unidirectional polarity alignment with DC supply topology, and SMA package thermal performance under sustained ambient temperatures up to +125°C.
Technical Context
This TVS diode employs glass-passivated silicon junction construction to achieve fast response time (<1.0 ns) and stable clamping under repetitive transient stress. Its unidirectional configuration enables integration into positive-rail protection schemes without reverse-bias leakage concerns above VRWM.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) immunity standards when applied with appropriate PCB layout-minimum trace inductance and direct connection to protected node and ground plane. Thermal derating follows a linear curve from 100% PPK at 25°C to ~50% at 100°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - Sustains single 8.3ms half-sine surges up to 400W without failure; defines maximum energy absorption capability. |
| Reverse Standoff Voltage | 30 V - Maximum continuous DC voltage before significant leakage; sets upper limit for protected circuit operating voltage. |
| Clamping Voltage @ IPP | 48.4 V - Voltage across device during 8.3A transient; must remain below absolute max rating of downstream ICs. |
| Breakdown Voltage | 33.3–36.8 V - Onset of avalanche conduction; ensures reliable turn-on before clamping threshold is exceeded. |
| Leakage Current @ VRWM | 5.0 µA - Minimal DC loading on 30V rail at room temperature; avoids unnecessary power loss or bias shift. |
| Operating Temperature | –55°C to +150°C - Validated junction temperature range; supports under-hood automotive and industrial control environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount molded plastic case with UL 94V-0 flammability rating, cathode band marking for polarity identification, 0.064g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path; completes avalanche conduction loop during transient events. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 30V supply rail); carries full transient current into ground via anode. |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables robust protection against ISO 7637-2 Test Pulse 1 (inductive switch-off) and Pulse 3a/b (line capacitance discharge) in 12V automotive systems. |
| Glass Passivated Die | Improves long-term reliability under humidity and thermal cycling by preventing moisture ingress at the PN junction interface. |
| Fast Response Time | Sub-nanosecond turn-on ensures clamping initiates before sensitive downstream components experience overvoltage stress. |
| RoHS & Halogen-Free | Meets EU RoHS 3 (2015/863/EU) and automotive green material requirements; no bromine, chlorine, or antimony compounds above threshold limits. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 30V auxiliary power rail feeding microcontroller I/O drivers and CAN transceivers from load dump transients. IC Role / Device Role: Unidirectional TVS placed between fused 30V supply and local decoupling capacitor, shunting surge energy to chassis ground. Use Value: Limits clamped voltage to 48.4V, staying 12% below typical 55V absolute max rating of automotive-grade MCUs and transceivers. | Use Scenario: Shields 24VDC digital input optocoupler front-end from field-wiring induced surges in factory automation cabinets. IC Role / Device Role: First-stage protection ahead of series current-limiting resistor and opto-LED; absorbs EFT bursts per IEC 61000-4-4 Level 4. Use Value: 5.0µA leakage at 30V VRWM prevents false triggering of 24V input thresholds while maintaining low standby power. |
| Telecom Remote Radio Unit (RRU) | Medical Infusion Pump Power Supply |
Use Scenario: Guards 30V backhaul Ethernet PHY power pins against lightning-induced surges entering via outdoor cabling. IC Role / Device Role: Secondary protection stage after gas discharge tube (GDT), providing low-clamp precision after GDT arc extinction. Use Value: 48.4V clamping ensures PHY ICs with 50V abs-max survive combined GDT+TVS coordinated protection without overstress. | Use Scenario: Secures 30V DC-DC converter output feeding motor driver and sensor analog front-end in battery-operated infusion pumps. IC Role / Device Role: Final-line TVS on regulated output, placed immediately before connector to prevent ESD coupling into sensitive analog circuits. Use Value: –55°C to +150°C operating range supports sterilization cycles and extended battery operation without parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-HF | Same electrical specs; halogen-free plating only (no antimony restriction stated); identical SMA package. | No AEC-Q200 qualification; intended for commercial/industrial use, not automotive. | Select when RoHS compliance suffices and automotive change control is not required. |
| SMCJ30A-13-F | Same VRWM/VBR/VC but higher 1500W PPK rating; larger SMC (DO-214AB) package with 2.3× footprint area. | Higher surge margin for 10/1000µs waveforms; requires more PCB area and has higher thermal mass. | Choose when legacy designs require >400W headroom or when board space allows larger package for enhanced reliability. |
Compared with SMAJ30A-HF, the -13-F variant adds full halogen- and antimony-free "Green" compliance and tape-and-reel packaging optimized for SMT production. Against SMCJ30A-13-F, it trades peak power capacity for compact SMA footprint-critical where board area is constrained but 400W meets IEC 61000-4-5 Level 3 requirements.
Availability
SMAJ30A-13-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, telecom remote radio units, and medical infusion pump power systems requiring stable component supply across multi-year production cycles.
Supply support for SMAJ30A-13-F 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, manufacturing, and sales operations across Asia, Europe, and the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability DC line protection in automotive, industrial, and communications equipment where compact size, precise clamping, and AEC-Q200-compliant variants are essential.
FAQ
What is the meaning of the "-13-F" suffix in SMAJ30A-13-F?
The "-13-F" suffix denotes tape-and-reel packaging: "13" indicates 5000 units per reel, and "F" specifies lead-free, RoHS-compliant matte tin plating on terminals. This format is optimized for automated SMT placement and meets J-STD-020 moisture sensitivity level 1 requirements.
Can SMAJ30A-13-F be used in bidirectional signal line protection?
No-SMAJ30A-13-F is unidirectional only, with cathode-band polarity marking. For bidirectional protection (e.g., RS-485, USB D+/D−), the bidirectional variant SMAJ30CA-13-F must be used, which lacks polarity marking and clamps symmetrically for both polarities.
How does the 48.4V clamping voltage relate to safe operation with a 30V system?
The 48.4V clamping voltage occurs at 8.3A peak pulse current under standardized 8.3ms/20ms surge waveform. It remains safely below the 50–55V absolute maximum ratings of most 30V-rated automotive and industrial ICs, providing ≥10V design margin for transient suppression without overstressing downstream components.
Is thermal derating required for continuous operation near 100°C ambient?
Yes-steady-state power dissipation drops from 1.0W at TL = +75°C to ~0.5W at +100°C per Figure 6. For sustained high-temperature environments, ensure copper pour area and airflow maintain lead temperature ≤75°C, or reduce applied DC bias to limit self-heating under leakage conditions.
SMAJ30A-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- 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:
- SMA
SMAJ30A-13-F FAQ
1.How can I place an order for SMAJ30A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30A-13-F 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-13-F reliable?
The price and inventory of SMAJ30A-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ30A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ30A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30A-13-F?
SMAJ30A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30A-13-F 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-13-F?
For technical support, including SMAJ30A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30A-13-F requirements.
6.How does Aetrix verify that SMAJ30A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ30A-13-F 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-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ30A-13-F?
All SMAJ30A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30A-13-F, 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-13-F part is unused and in its original packaging.
Return procedure for SMAJ30A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30A-13-F Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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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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Toshiba Semiconductor and Storage
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Diodes Incorporated
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