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Diodes Incorporated SMAJ120AQ-13-F
- Part No.:
- SMAJ120AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120AQ-13-F.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,199
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Product details
Overview
SMAJ120AQ-13-F from Diodes Incorporated is a unidirectional 400W automotive transient voltage suppressor (TVS) diode with 120V reverse standoff voltage, 193V max clamping voltage at 2.0A peak pulse current, and AEC-Q101 qualification. It protects CAN, LIN, and power-line circuits in engine control units, body control modules, and ADAS sensors against ISO7637-2 Pulse 1 (–100V), Pulse 3a (–150V), and ISO10605 ESD events.
For engineers reviewing the SMAJ120AQ-13-F datasheet, SMAJ120AQ-13-F pinout, SMAJ120AQ-13-F application, or SMAJ120AQ-13-F equivalent, this device delivers verified clamping performance under automotive surge waveforms, supports lead-free reflow assembly, and provides traceable IATF 16949 manufacturing with PPAP documentation support.
Technical Context
This TVS diode uses glass-passivated silicon junction construction to achieve fast response (<1 ps) to transients and stable clamping across –55°C to +175°C junction temperature. Its unidirectional polarity enables asymmetric protection on DC-biased lines such as 12V/24V battery feeds and sensor supply rails.
The device complies with ISO7637-2 Pulse 1 (inductive load dump), Pulse 3a (capacitive coupling), and ISO10605 (30kV air/contact discharge) without derating up to +85°C ambient. Clamping voltage is specified per 10×1000μs waveform with 1.0mA test current for breakdown verification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000μs surges up to 2.0A without failure |
| Reverse Standoff Voltage (VRWM) | 120V - blocks normal operating voltage while remaining non-conductive |
| Max Clamping Voltage (VC) | 193V @ IPP = 2.0A - limits downstream voltage to safe level during ISO7637-2 Pulse 1 |
| Breakdown Voltage (VBR) | 133–147V @ IT = 1.0mA - ensures reliable turn-on before system damage threshold |
| Leakage Current (IR) | ≤0.5µA @ VRWM - negligible standby power loss in always-on automotive modules |
| Operating Temperature | –55°C to +175°C - supports under-hood placement in ECUs and transmission controllers |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic UL 94V-0 housing, cathode band marking for unidirectional polarity. Moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; defines conduction direction |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., CAN_H, 12V rail); carries full transient current |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with HTOL, TC, UHAST, and ESD testing per stress requirements |
| Glass-passivated die | Eliminates moisture ingress risk and improves long-term reliability in humid under-hood environments |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and "Green" definition: Br+Cl <1500ppm, Sb <1000ppm |
| IATF 16949 manufacturing | Ensures PPAP-ready production with full traceability, change control, and defect containment |
Applications
| Engine Control Unit (ECU) Power Input | CAN FD Transceiver Protection |
|---|---|
Use Scenario: 12V battery feed to microcontroller power supply in gasoline/diesel ECUs exposed to load dump pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main VBAT rail upstream of DC-DC converter. Use Value: Limits voltage to ≤193V during ISO7637-2 Pulse 1 (–100V), preventing regulator latch-up and MCU brownout. |
Use Scenario: Bidirectional data line protection on CAN FD nodes in ADAS domain controllers. IC Role / Device Role / Timing Role: Unidirectional TVS on CAN_H line referenced to chassis ground. Use Value: Clamps ESD transients to <200V within 1ps, preserving signal integrity at 5 Mbps without adding capacitance. |
| Body Control Module (BCM) LIN Bus | Electric Power Steering (EPS) Motor Driver |
Use Scenario: LIN bus termination in door module with shared 12V supply and ground. IC Role / Device Role / Timing Role: Low-leakage (≤0.5µA) standoff device on LIN signal line. Use Value: Maintains <1µA total bus leakage across 10 nodes while clamping ISO10605 contact discharge to ≤193V. |
Use Scenario: H-bridge gate driver supply rail protection in EPS motor control units. IC Role / Device Role / Timing Role: Fast-response clamp on 12V logic supply feeding half-bridge drivers. Use Value: Survives repetitive 40A surge events (IFSM) from motor back-EMF without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-13-F | No AEC-Q101 qualification; standard industrial grade | Not approved for automotive PPAP; limited to non-safety-critical consumer/industrial designs | Select only if AEC-Q101 compliance and IATF 16949 traceability are not required |
| SMCJ120A-Q | Higher 1500W peak power; SMC package (larger footprint) | Used where higher surge margin is needed (e.g., alternator output lines), but requires PCB area increase | Choose when system-level surge tests exceed 400W or require >5kA IFSM capability |
Compared with SMAJ120A-13-F, the AQ variant adds automotive qualification and tighter process controls; compared with SMCJ120A-Q, it trades surge capacity for space-constrained layouts in compact ECUs and sensor nodes.
Availability
SMAJ120AQ-13-F is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera systems requiring stable component supply with full automotive change control and PPAP documentation.
Supply support for SMAJ120AQ-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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with design centers in Asia, Europe, and the US, and manufacturing in IATF 16949-certified facilities.
The SMAJ-AQ series is part of Diodes' automotive-grade TVS portfolio, engineered specifically for ISO7637-2 and ISO10605 compliance in safety-critical vehicle subsystems including powertrain, chassis, and infotainment.
FAQ
What is the maximum clamping voltage of SMAJ120AQ-13-F under ISO7637-2 Pulse 1 conditions?
The maximum clamping voltage is 193V at 2.0A peak pulse current, measured per the 10×1000μs waveform defined in Figure 4 of DS40739. This value ensures downstream components see no more than 193V during a –100V load dump event, well below typical 200V-rated automotive IC thresholds.
Does SMAJ120AQ-13-F support lead-free reflow soldering?
Yes - it features matte tin-plated terminals compliant with MIL-STD-202, Method 208, and rated for standard Pb-free reflow profiles (peak 260°C). The SMA package's thermal mass allows full wetting without delamination, and its moisture sensitivity level 1 eliminates bake requirements prior to assembly.
How does the AQ suffix differ from standard SMAJ120A-13-F?
The "AQ" suffix denotes AEC-Q101 qualification, IATF 16949 manufacturing, PPAP capability, and automotive-specific change control. Standard SMAJ120A-13-F lacks these certifications and is intended for industrial/commercial use only, with no guaranteed automotive reliability testing or documentation.
Can SMAJ120AQ-13-F be used on bidirectional signal lines like CAN_H/CAN_L?
It is unidirectional and must be placed with cathode toward the protected line and anode to ground - suitable for CAN_H protection. For symmetrical protection on both lines, two devices are required (one per line), or a bi-directional part like SMAJ120CQ-13-F should be selected instead.
SMAJ120AQ-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):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 2A
- 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
SMAJ120AQ-13-F FAQ
1.How can I place an order for SMAJ120AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120AQ-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 SMAJ120AQ-13-F reliable?
The price and inventory of SMAJ120AQ-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 SMAJ120AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ120AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120AQ-13-F?
SMAJ120AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120AQ-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 SMAJ120AQ-13-F?
For technical support, including SMAJ120AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120AQ-13-F requirements.
6.How does Aetrix verify that SMAJ120AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ120AQ-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 SMAJ120AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ120AQ-13-F?
All SMAJ120AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120AQ-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 SMAJ120AQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ120AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ120AQ-13-F Tags
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