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Diodes Incorporated SMAJ30AQ-13-F
- Part No.:
- SMAJ30AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30AQ-13-F.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:30,937
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Product details
Overview
SMAJ30AQ-13-F from Diodes Incorporated is a unidirectional 400W surface-mount automotive transient voltage suppressor (TVS) diode with 30V reverse standoff voltage, 48.4V max clamping voltage at 8.3A peak pulse current, and AEC-Q101 qualification for under-hood electronics protection. It safeguards CAN/LIN bus interfaces, body control modules, and infotainment power rails against ISO7637-2 Pulse 1 (−100V), Pulse 2a (+50V), and ISO10605 ESD (±30kV).
For engineers reviewing the SMAJ30AQ-13-F datasheet, SMAJ30AQ-13-F pinout, SMAJ30AQ-13-F application, or SMAJ30AQ-13-F equivalent, this device is selected for automotive-grade surge immunity where clamping voltage margin, IATF 16949 traceability, and 175°C junction operation are critical design constraints.
Technical Context
This TVS diode uses glass-passivated silicon junction construction to achieve fast response (<1ps) to transients and stable breakdown behavior across −55°C to +175°C operating range. Its unidirectional polarity enables asymmetric surge suppression on DC-biased lines such as 12V battery feeds and sensor supply rails.
The device complies with ISO7637-2 Pulse 1 (−100V, 50Ω source), Pulse 2a (+50V, 2Ω), and Pulse 3a/3b waveforms, and meets ISO10605 ESD requirements (150pF/330Ω, ±30kV air/contact discharge). Clamping performance is specified per 10×1000μs waveform with 48.4V VC at IPP = 8.3A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000μs surges without failure in automotive load-dump or inductive switching events |
| Reverse Standoff Voltage (VRWM) | 30V - blocks normal 12V/24V system voltages while remaining fully inactive below clamping threshold |
| Max Clamping Voltage (VC) | 48.4V @ IPP = 8.3A - limits downstream IC stress to safe levels during ISO7637-2 Pulse 1 and Pulse 2a transients |
| Breakdown Voltage (VBR) | 33.3–36.8V @ IT = 1.0mA - ensures reliable turn-on before VC is reached, with <10% tolerance for production consistency |
| Leakage Current (IR) | ≤0.5μA @ VRWM = 30V - prevents measurable power loss or signal distortion in always-on automotive circuits |
| Junction Temperature Range | −55°C to +175°C - supports placement near engines, alternators, or power inverters without derating |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic UL 94V-0 housing; cathode band denotes anode-to-cathode polarity for unidirectional operation; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; completes clamping loop during negative transients |
| Cathode | High-side connection point | Connected to protected line (e.g., 12V rail); conducts surge current to ground when VRWM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with PPAP capability and IATF 16949 manufacturing control |
| Glass passivated die | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and "Green" definition: Br+Cl <1500ppm, Sb <1000ppm |
| 40A peak forward surge rating | Withstands repetitive 8.3ms half-sine surges up to 40A (derated above +25°C ambient) |
Applications
| Body Control Module (BCM) | Infotainment Power Supply |
|---|---|
Use Scenario: Protects 12V input to microcontroller-based BCMs exposed to load dump and alternator ripple. IC Role / Device Role: Primary overvoltage clamp on main power rail upstream of DC-DC converters. Use Value: Limits transient voltage to ≤48.4V, preventing latch-up or gate oxide damage in 3.3V/5V logic ICs. |
Use Scenario: Shields USB-C PD and display power inputs in head units from ignition-switching spikes. IC Role / Device Role: Secondary surge suppressor after primary fuse and LC filter, before LDO regulators. Use Value: Maintains <0.5μA leakage at 30V, avoiding standby current penalty in always-on audio subsystems. |
| CAN FD Transceiver Interface | LED Headlamp Driver Input |
Use Scenario: Guards high-speed CAN FD transceivers (e.g., TJA1057) against ESD and coupled noise on vehicle harnesses. IC Role / Device Role: Line-side TVS on CAN_H/CAN_L differential pair, placed adjacent to connector. Use Value: Responds in <1ps to meet ISO10605 ±30kV contact discharge requirement without signal integrity degradation. |
Use Scenario: Protects buck controller ICs in adaptive LED headlamps from battery reversal and jump-start surges. IC Role / Device Role: Unidirectional clamp on 12V input to LED driver IC (e.g., LM3409HV). Use Value: Withstands −100V ISO7637-2 Pulse 1 with 48.4V clamping, preserving MOSFET gate drive integrity. |
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-13-F | No AEC-Q101 qualification; standard industrial grade; same electrical specs and package | Not approved for automotive PPAP; suitable for non-safety-critical industrial controls | Select only if automotive change control, IATF 16949 traceability, or AEC-Q101 test reports are not required |
| SMCJ30A-Q | Higher 1500W PPK rating; DO-214AB (SMC) package; 30V VRWM; AEC-Q101 qualified | Larger footprint; used where higher energy absorption (e.g., alternator load dump) is needed | Choose when surge energy exceeds 400W capability-requires PCB layout revision for SMC pad geometry |
Compared with SMAJ30A-13-F, the AQ variant adds automotive qualification and process control; compared with SMCJ30A-Q, it trades peak power for smaller SMA footprint-critical for space-constrained ADAS sensor modules.
Availability
SMAJ30AQ-13-F is available at Aetrix Electronics and suitable for automotive body electronics, infotainment systems, and ADAS sensor power protection requiring stable component supply across multi-year vehicle production cycles.
Supply support for SMAJ30AQ-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, specializing in high-reliability components for automotive, industrial, and computing markets.
This device belongs to the SMAJ-AQ automotive TVS family, engineered specifically for ISO7637-2 and ISO10605 compliance in harsh-temperature vehicle environments-targeting under-hood, chassis, and powertrain ECUs.
FAQ
What is the maximum clamping voltage of SMAJ30AQ-13-F at its rated peak pulse current?
The maximum clamping voltage (VC) is 48.4V at a peak pulse current (IPP) of 8.3A, measured using the standardized 10×1000μs waveform per Figure 4 in DS40739 Rev. 17-2. This value defines the upper voltage limit imposed on protected circuitry during worst-case transients.
Does SMAJ30AQ-13-F support bidirectional transient suppression?
No-it is a unidirectional TVS diode, indicated by the absence of "C" in the part number. It suppresses only positive-going transients on the cathode-connected line and negative transients referenced to ground. For bidirectional protection (e.g., data lines), SMAJ30CAQ-13-F must be used.
How does the AEC-Q101 qualification impact supply chain handling of this part?
AEC-Q101 qualification mandates full PPAP documentation, lot-level traceability, and IATF 16949-certified manufacturing. Aetrix provides certified material test reports, change notifications, and lifetime monitoring-ensuring zero-defect delivery for Tier 1 automotive programs.
Can SMAJ30AQ-13-F replace SMAJ33AQ-13-F in a 12V system design?
No-SMAJ30AQ has 30V VRWM and 33.3–36.8V VBR, while SMAJ33AQ has 33V VRWM and 36.7–40.6V VBR. Substituting lowers the clamping margin and risks premature conduction during normal 13.5V battery float voltage, especially at elevated temperatures.
SMAJ30AQ-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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ30AQ-13-F FAQ
1.How can I place an order for SMAJ30AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30AQ-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 SMAJ30AQ-13-F reliable?
The price and inventory of SMAJ30AQ-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 SMAJ30AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ30AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30AQ-13-F?
SMAJ30AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30AQ-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 SMAJ30AQ-13-F?
For technical support, including SMAJ30AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30AQ-13-F requirements.
6.How does Aetrix verify that SMAJ30AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ30AQ-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 SMAJ30AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ30AQ-13-F?
All SMAJ30AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30AQ-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 SMAJ30AQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ30AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30AQ-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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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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