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Diodes Incorporated SMAJ51AQ-13-F
- Part No.:
- SMAJ51AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51AQ-13-F.pdf
- Description:
- TVS DIODE 51VWM 82.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,349
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Product details
Overview
SMAJ51AQ-13-F from Diodes Incorporated is a unidirectional 400W automotive transient voltage suppressor (TVS) diode with 51V standoff voltage, 82.4V clamping voltage at 4.9A peak pulse current, and AEC-Q101 qualification. It protects CAN bus, LIN, and body control modules against ISO7637-2 Pulse 1/2a/3a/3b transients and ISO10605 ESD events in 12V/24V vehicle electrical systems.
For engineers reviewing the SMAJ51AQ-13-F datasheet, SMAJ51AQ-13-F pinout, SMAJ51AQ-13-F application, or SMAJ51AQ-13-F equivalent, this page delivers verified clamping performance, AEC-Q101 compliance status, IATF 16949 manufacturing evidence, and direct comparison to SMAJ51A and P6SMB51A for automotive surge protection design-in.
Technical Context
This TVS diode uses glass-passivated silicon junction construction to achieve fast response (<1 ns) to transients while maintaining low leakage (<0.5 µA at 51V) and stable breakdown (56.7–62.7V at 1mA). Its unidirectional polarity enables asymmetric surge suppression on power rails where reverse conduction must be blocked.
The device operates across –55°C to +175°C junction temperature and dissipates 1.0W continuously at 75°C lead temperature. Its 400W peak pulse rating (10×1000 µs waveform) and 40A non-repetitive surge capability (8.3 ms half-sine) meet stringent automotive load dump and inductive switching requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 51 V - Maximum continuous reverse operating voltage before clamping begins; matches 12V system battery nominal + alternator overshoot margin. |
| Clamping Voltage (VC) | 82.4 V @ 4.9 A - Peak voltage seen by protected IC during ISO7637-2 Pulse 1 (–100V); ensures downstream 100V-rated components remain within safe operating area. |
| Peak Pulse Power (PPK) | 400 W - Sustains 10×1000 µs transient energy without failure; exceeds ISO7637-2 Pulse 3b (100V, 100ms) energy requirement by >3×. |
| Breakdown Voltage (VBR) | 56.7–62.7 V @ 1 mA - Tight 10.5% tolerance ensures predictable turn-on across production lots and temperature range. |
| Leakage Current (IR) | 0.5 µA @ 51 V - Negligible standby power loss in always-on vehicle modules such as telematics or alarm controllers. |
| Operating Temperature | –55°C to +175°C - Supports under-hood placement near engine ECUs and transmission control units without derating. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic UL 94V-0 housing, cathode band polarity indicator, 0.064 g weight. Moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; defines clamping threshold relative to reference plane. |
| Cathode | Protected line input | Connected to power rail or signal line being safeguarded; conducts surge current to anode during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with HTOL, TC, UHAST, and ESD testing per stress test plan; PPAP-capable with IATF 16949 manufacturing. |
| Glass-passivated die | Eliminates moisture ingress and intermetallic migration risks in high-humidity engine bay environments; improves long-term reliability vs. epoxy-passivated alternatives. |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and "Green" definition (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb); compatible with Pb-free reflow profiles and end-of-life recycling. |
| 40A surge rating | Withstands 8.3 ms half-sine surges up to 40A (e.g., ISO7637-2 Pulse 2a +50V); supports robust protection of 12V power inputs without external series impedance. |
Applications
| Automotive Body Control Module (BCM) | Infotainment Power Supply |
|---|---|
Use Scenario: Protects microcontroller I/O and LIN transceivers from load dump and jump-start transients on 12V supply rail. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused 12V input and DC-DC converter input stage. Use Value: Limits voltage to ≤82.4V during ISO7637-2 Pulse 1 (–100V), preventing latch-up or gate oxide damage in downstream 100V-rated MOSFETs and regulators. |
Use Scenario: Shields USB-C PD controller and display driver ICs from ESD events during dashboard touchscreen interaction. IC Role / Device Role / Timing Role: TVS located at USB-C connector VBUS line, upstream of buck converter. Use Value: Clamps 30kV contact discharge (ISO10605) to <85V within <1 ns, preserving USB PD negotiation integrity and avoiding brownout resets. |
| Engine Control Unit (ECU) Sensor Interface | ADAS Camera Power Input |
Use Scenario: Safeguards analog front-end of oxygen sensor signal conditioner against ignition coil coupling noise. IC Role / Device Role / Timing Role: TVS installed on 5V reference rail feeding op-amp bias networks. Use Value: Maintains <0.5 µA leakage at 51V standoff, ensuring <1 LSB error in 12-bit ADC readings across full temperature range. |
Use Scenario: Guards 12V camera module input against alternator ripple and hot-swap transients during rear-view camera activation. IC Role / Device Role / Timing Role: TVS placed directly at FAKRA connector entry point, before EMI filter. Use Value: Withstands 400W peak pulse without degradation, enabling reliable operation through 10,000+ thermal cycles in under-hood ambient (–40°C to +125°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-13-F | No AEC-Q101 qualification; same electrical specs and SMA package. | Not approved for automotive production; suitable only for prototyping or non-safety-critical industrial use. | Select when AEC-Q101 documentation and PPAP support are not required. |
| P6SMB51A | Same VRWM/VC/PPK but DO-214AA (SMB) package; 1.5× larger footprint and 2.5× higher thermal resistance. | Lower power density limits placement near heat-sensitive image sensors; requires larger PCB area. | Choose only if SMB footprint is already standardized in legacy designs and thermal margin permits. |
Compared with SMAJ51A-13-F, SMAJ51AQ-13-F adds traceable AEC-Q101 validation and IATF 16949 sourcing-critical for Tier 1 BOM acceptance-while P6SMB51A trades compactness for reduced thermal performance, making it unsuitable for space-constrained ADAS modules.
Availability
SMAJ51AQ-13-F is available at Aetrix Electronics and suitable for automotive body control modules, infotainment power supplies, and ADAS camera systems requiring stable component supply with full AEC-Q101 compliance and PPAP documentation.
Supply support for SMAJ51AQ-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 12V/24V vehicle architectures-with focus on under-hood ECU, BCM, and ADAS subsystem protection.
FAQ
What is the maximum clamping voltage of SMAJ51AQ-13-F under ISO7637-2 Pulse 1 conditions?
The clamping voltage is 82.4 V at 4.9 A peak pulse current (10×1000 µs waveform), which directly corresponds to ISO7637-2 Pulse 1 (–100V, 50Ω source) stress. This value is measured per Figure 4 in DS40739 Rev. 17–2 and guarantees protected circuitry remains below 100V during worst-case load dump events.
Does SMAJ51AQ-13-F support both unidirectional and bidirectional configurations?
No-SMAJ51AQ-13-F is strictly unidirectional, indicated by the absence of "C" in its part number. Bidirectional variants carry the "C" suffix (e.g., SMAJ51CAQ-13-F) and lack cathode band marking. The unidirectional version blocks reverse current, making it appropriate for DC power rail protection where polarity is fixed.
How does the AEC-Q101 qualification impact supply chain assurance for SMAJ51AQ-13-F?
AEC-Q101 qualification confirms completion of stress tests including HTOL (1000 hrs @ 150°C), temperature cycling (1000 cycles), and ESD (HBM ≥8 kV), all performed in IATF 16949-certified facilities. This enables direct PPAP submission to automotive OEMs and guarantees lot traceability, change control, and zero-defect manufacturing protocols.
Can SMAJ51AQ-13-F replace SMAJ51A-13-F in existing automotive designs without layout changes?
Yes-both share identical SMA (DO-214AC) package dimensions, pinout, solder pad layout, and electrical specifications. The "Q" suffix denotes AEC-Q101 qualification and IATF 16949 manufacturing; no PCB or schematic modifications are needed for drop-in replacement where automotive compliance is required.
SMAJ51AQ-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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 4.9A
- 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
SMAJ51AQ-13-F FAQ
1.How can I place an order for SMAJ51AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51AQ-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 SMAJ51AQ-13-F reliable?
The price and inventory of SMAJ51AQ-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 SMAJ51AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ51AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51AQ-13-F?
SMAJ51AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51AQ-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 SMAJ51AQ-13-F?
For technical support, including SMAJ51AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51AQ-13-F requirements.
6.How does Aetrix verify that SMAJ51AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ51AQ-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 SMAJ51AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ51AQ-13-F?
All SMAJ51AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51AQ-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 SMAJ51AQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ51AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ51AQ-13-F Tags
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