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Diodes Incorporated SMAJ20AQ-13-F
- Part No.:
- SMAJ20AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20AQ-13-F.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:18,613
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Product details
Overview
SMAJ20AQ-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for automotive power line and signal line surge protection. It features a 20V reverse standoff voltage (VRWM), 32.4V maximum clamping voltage at 12.3A peak pulse current, and AEC-Q101 qualification for under-hood applications including engine control units and body electronics.
For engineers reviewing the SMAJ20AQ-13-F datasheet, SMAJ20AQ-13-F pinout, SMAJ20AQ-13-F application, or SMAJ20AQ-13-F equivalent, key selection criteria include ISO7637-2 Pulse 1/2a/3a/3b compliance, 30kV ESD robustness per ISO10605, glass-passivated die reliability, and SMA package thermal performance in high-temperature automotive environments.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-anode polarity, activated only during negative transients relative to its anode reference. Its glass-passivated junction ensures stable breakdown behavior across -55°C to +175°C operating temperature range and supports IATF 16949-certified manufacturing traceability.
The device responds to standardized 10/1000μs surge waveforms with 32.4V clamping at 12.3A IPP, delivering precise overvoltage limiting without forward conduction during normal 13.5V automotive battery operation. Its 1.0W steady-state power rating at TL = +75°C enables reliable thermal management on compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000μs surges per ISO7637-2 without degradation |
| Reverse Standoff Voltage | 20V - blocks normal battery voltage (13.5V) while triggering above system max |
| Clamping Voltage | 32.4V @ 12.3A - limits downstream IC voltage to safe level during Pulse 1 (-100V) |
| Breakdown Voltage | 22.2–24.5V @ 1mA - ensures consistent avalanche initiation across production lot |
| Leakage Current | <0.5μA @ 20V - prevents parasitic drain in always-on vehicle modules |
| Operating Temperature | -55°C to +175°C - qualified for engine bay placement near exhaust manifolds |
| AEC-Q101 Qualified | Yes - validated for automotive electronic control unit deployment with PPAP support |
Pinout & Package
Package: SMA (Surface Mount Axial), molded plastic UL 94V-0, 0.064g weight, cathode band polarity indicator, lead-free matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for clamping threshold | Connected to protected line; defines 20V standoff relative to cathode |
| Cathode | Surge return path | Connected to ground or lower-potential rail; carries full 12.3A transient current |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables single-event suppression of ISO7637-2 Pulse 1 (-100V) without failure |
| Glass Passivated Die | Eliminates moisture-induced parameter drift in humid under-hood environments |
| AEC-Q101 Qualification | Validates reliability for 15-year automotive service life with zero infant mortality |
| Lead-Free & Halogen-Free | Meets EU RoHS 3 and automotive green material requirements (Br+Cl <1500ppm) |
| SMA Package Thermal Performance | Dissipates 1.0W at +75°C lead temperature-supports high-density engine control PCBs |
Applications
| Engine Control Unit (ECU) Power Input | Automotive CAN Bus Transceiver Protection |
|---|---|
Use Scenario: Protects 5V/3.3V microcontroller power rails from load dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS clamps negative-going spikes to ≤32.4V while remaining high-impedance during nominal 13.5V operation. Use Value: Prevents MCU brown-out reset and internal latch-up during ISO7637-2 Pulse 1 events. | Use Scenario: Shields high-speed CAN FD transceivers from electrostatic discharge during connector mating/unmating. IC Role / Device Role / Timing Role: Fast-response avalanche diode limits bus voltage to 32.4V within nanoseconds of 30kV contact discharge. Use Value: Maintains CAN bit timing integrity by avoiding transceiver shutdown during ISO10605 ESD events. |
| Body Control Module (BCM) LIN Bus | Automotive Camera Power Line Protection |
Use Scenario: Guards LIN physical layer against battery reversal and jump-start surges in door module electronics. IC Role / Device Role / Timing Role: Unidirectional clamping device referenced to ground, triggered only on negative transients exceeding 20V. Use Value: Preserves LIN communication continuity during ISO7637-2 Pulse 2a (+50V) and Pulse 3b (+100V) events. | Use Scenario: Safeguards 12V power input of ADAS cameras mounted near front grille exposed to road splash and vibration. IC Role / Device Role / Timing Role: Automotive-grade TVS with -55°C to +175°C operation withstands thermal cycling in exterior mounting locations. Use Value: Eliminates field failures caused by moisture ingress-induced leakage in non-hermetic camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-13-F | Non-automotive grade; lacks AEC-Q101 qualification and PPAP documentation | Restricted to industrial/commercial use; not approved for OEM vehicle production | Select only for non-automotive prototyping where cost sensitivity outweighs qualification requirements |
| SMCJ20A-Q | Higher 1500W peak power; DO-214AB package with larger thermal mass | Used where higher surge margin is required (e.g., alternator output lines); less space-efficient | Choose when system-level testing reveals insufficient margin with 400W rating, accepting 3.5× PCB area increase |
Compared with SMAJ20A-13-F, SMAJ20AQ-13-F adds AEC-Q101 validation and IATF 16949 traceability essential for Tier 1 supply chains; versus SMCJ20A-Q, it trades peak power for SMA footprint efficiency in space-constrained ECUs.
Availability
SMAJ20AQ-13-F is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera systems requiring stable component supply across multi-year automotive production programs.
Supply support for SMAJ20AQ-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 manufacturer specializing in discrete, analog, and mixed-signal solutions with focus on automotive, industrial, and computing markets.
The SMAJ series is engineered specifically for AEC-Q101-compliant automotive transient suppression, targeting ISO7637-2 and ISO10605 compliance in engine bay and chassis-mounted electronics.
FAQ
What is the maximum clamping voltage of SMAJ20AQ-13-F at its rated peak pulse current?
The maximum clamping voltage is 32.4V at 12.3A peak pulse current (IPP), measured using the standard 10×1000μs waveform defined in IEC 61000-4-5. This value ensures protected circuits remain below 33V during ISO7637-2 Pulse 1 events, preventing damage to 3.3V/5V logic interfaces.
How does SMAJ20AQ-13-F differ from non-automotive SMAJ20A-13-F?
SMAJ20AQ-13-F includes full AEC-Q101 qualification, PPAP documentation, and manufacturing in IATF 16949-certified facilities-requirements absent in SMAJ20A-13-F. It also undergoes additional temperature cycling and humidity testing to validate performance across -55°C to +175°C.
Can SMAJ20AQ-13-F be used for bidirectional surge protection?
No-SMAJ20AQ-13-F is unidirectional only, indicated by the absence of "C" suffix. For bidirectional protection, select SMAJ20CAQ-13-F, which clamps both positive and negative transients but exhibits doubled leakage current below 10V VRWM per datasheet Note 12.
What is the thermal derating behavior of SMAJ20AQ-13-F above +75°C?
Steady-state power dissipation drops linearly from 1.0W at TL = +75°C to zero at TL = +175°C, per Figure 6. At +125°C lead temperature, maximum continuous power is reduced to 0.5W, requiring careful PCB copper pour design to maintain thermal resistance below 100°C/W in high-ambient under-hood locations.
SMAJ20AQ-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 12.3A
- 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
SMAJ20AQ-13-F FAQ
1.How can I place an order for SMAJ20AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20AQ-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 SMAJ20AQ-13-F reliable?
The price and inventory of SMAJ20AQ-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 SMAJ20AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ20AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20AQ-13-F?
SMAJ20AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20AQ-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 SMAJ20AQ-13-F?
For technical support, including SMAJ20AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20AQ-13-F requirements.
6.How does Aetrix verify that SMAJ20AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ20AQ-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 SMAJ20AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ20AQ-13-F?
All SMAJ20AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20AQ-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 SMAJ20AQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ20AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ20AQ-13-F 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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ESD5Z5.0T1G
onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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