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Diodes Incorporated SMAJ12AQ-13-F
- Part No.:
- SMAJ12AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ12AQ-13-F.pdf
- Description:
- TVS DIODE 12VWM 19.9VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:2,563
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Product details
Overview
SMAJ12AQ-13-F from Diodes Incorporated is a unidirectional 400W surface-mount automotive transient voltage suppressor (TVS) diode with 12V reverse standoff voltage, 19.9V max clamping voltage at 20.1A peak pulse current, and AEC-Q101 qualification for under-hood and powertrain applications.
For engineers reviewing the SMAJ12AQ-13-F datasheet, SMAJ12AQ-13-F pinout, SMAJ12AQ-13-F application, or SMAJ12AQ-13-F equivalent, this device is selected for ISO7637-2 Pulse 1/2a/3a/3b surge protection and ISO10605 ESD hardening in 12V automotive electrical systems where clamping performance, thermal robustness, and PPAP-capable supply chain traceability are critical.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during transients, triggering at ≥13.3V breakdown (min) and limiting induced surges to ≤19.9V at 20.1A (10×1000μs waveform). Its glass-passivated junction ensures stable leakage (<0.5μA @ 12V) and low capacitance for signal integrity preservation.
Designed for automotive-grade reliability, it sustains operation from −55°C to +175°C junction temperature, supports 40A non-repetitive forward surge (8.3ms half-sine), and delivers 1.0W steady-state dissipation at 75°C lead temperature - enabling placement near high-heat sources like ECUs and motor drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - withstands ISO7637-2 Pulse 1 (−100V) and Pulse 3a (−150V) without failure |
| Reverse Standoff Voltage | 12V - blocks normal 12V battery system voltage while remaining inactive during nominal operation |
| Max Clamping Voltage | 19.9V @ 20.1A - limits transient overvoltage to safe levels for downstream 24V-tolerant ICs and sensors |
| Breakdown Voltage | 13.3–14.7V @ 1mA - precise turn-on threshold ensures early clamping before damage occurs |
| Leakage Current | <0.5μA @ 12V - negligible standby power loss and no interference with low-current sensor biasing |
| Operating Temperature | −55°C to +175°C - qualified for engine compartment, transmission control, and ADAS radar modules |
Pinout & Package
Package: SMA (Surface Mount Assembly), molded plastic UL 94V-0 housing, 0.064g weight, cathode band polarity indicator for unidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during reverse-biased clamping | Connected to protected line (e.g., LIN bus, CAN shield, or power rail input) |
| Cathode | Current exit point during clamping; tied to ground or low-impedance return path | Must be routed with minimal inductance to maintain clamping speed and effectiveness |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test requirements including HTGB, TCT, and HTRB - enables PPAP submission |
| Glass-passivated die | Eliminates moisture ingress risk and improves long-term stability of VBR and leakage in humid under-hood environments |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and "Green" definition (<900ppm Br, <900ppm Cl, <1000ppm Sb) for eco-compliant vehicle assembly |
| ISO7637-2 & ISO10605 compliant | Tested to full Pulse 1/2a/3a/3b waveforms and ±30kV ESD (air/contact) - reduces need for external validation |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus Line |
|---|---|
Use Scenario: Protects 12V main power rail of gasoline/diesel engine ECUs against load dump and alternator ripple-induced spikes. IC Role / Device Role / Timing Role: Shunt-clamp TVS placed upstream of DC-DC converters and microcontroller LDOs. Use Value: Limits transient voltage to ≤19.9V, preventing latch-up or gate oxide damage in 3.3V/5V logic supplies. |
Use Scenario: Shields LIN physical layer transceivers from ESD events during service port connection/disconnection. IC Role / Device Role / Timing Role: Fast-response clamping element on LIN data line referenced to chassis ground. Use Value: Responds within nanoseconds to ±30kV contact discharge, preserving signal integrity and avoiding bus reset. |
| Transmission Control Module (TCM) Sensor Supply | ADAS Radar Power Rail |
Use Scenario: Guards 5V/12V sensor excitation rails (e.g., throttle position, crankshaft sensors) against cable harness coupling. IC Role / Device Role / Timing Role: Low-leakage (≤0.5μA) TVS ensuring minimal impact on precision analog sensor biasing. Use Value: Maintains accuracy of ratiometric measurements by avoiding DC offset drift from leakage current. |
Use Scenario: Safeguards 12V power input of 77GHz radar modules exposed to ignition noise and switching transients. IC Role / Device Role / Timing Role: High-temperature-rated (TJ = −55°C to +175°C) clamping device mounted near RF front-end. Use Value: Survives under-hood thermal cycling while delivering consistent 400W surge handling across full operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-13-F | No AEC-Q101 qualification; standard industrial grade only | Not approved for PPAP or IATF 16949 production; unsuitable for Tier 1 automotive BOMs | Select only for non-automotive prototypes or cost-sensitive industrial controls where qualification is waived |
| SMCJ12A-Q | Higher 1500W peak power rating; DO-214AB package (larger footprint) | Better suited for higher-energy transients (e.g., heavy-duty truck ISO7637-2 Pulse 1 up to −150V) | Choose when surge energy exceeds 400W capability or board layout allows larger SMC package |
Compared with SMAJ12AQ-13-F, SMAJ12A-13-F lacks automotive qualification and traceability, while SMCJ12A-Q trades compact SMA size for greater surge margin - making SMAJ12AQ-13-F the optimal balance of AEC compliance, space efficiency, and 12V system protection.
Availability
SMAJ12AQ-13-F is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control modules, and ADAS radar systems requiring stable component supply with full automotive change control and PPAP documentation support.
Supply support for SMAJ12AQ-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 series, engineered specifically for ISO7637-2 and ISO10605 compliance in 12V/24V vehicle networks - emphasizing AEC-Q101 qualification, thermal resilience, and zero-defect manufacturing in IATF 16949 facilities.
FAQ
What is the clamping voltage of SMAJ12AQ-13-F at its rated peak pulse current?
The maximum clamping voltage is 19.9V measured at 20.1A peak pulse current using the standardized 10×1000μs double-exponential waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and ensures downstream 24V-rated components remain within safe operating limits during surge events.
Is SMAJ12AQ-13-F suitable for bidirectional signal lines like CAN or LIN?
No - SMAJ12AQ-13-F is unidirectional and must be used with correct polarity (cathode to ground). For bidirectional data lines such as CAN or LIN, the bi-directional variant SMAJ12CAQ-13-F is required, which provides symmetrical clamping for both positive and negative transients without polarity constraints.
How does the AEC-Q101 qualification impact supply chain use of this part?
AEC-Q101 qualification confirms completion of stress tests including high-temperature reverse bias, temperature cycling, and unbiased highly accelerated stress testing - enabling direct inclusion in Tier 1 automotive BOMs, PPAP submissions, and IATF 16949-compliant production without additional qualification by the customer.
Can SMAJ12AQ-13-F replace SMAJ12A-13-F in an existing design?
Yes, electrically and mechanically - same SMA package, identical pinout, and matching electrical parameters. However, substitution requires revalidation of PPAP documentation and confirmation that the application's automotive qualification requirements are fully met, as SMAJ12AQ-13-F adds AEC-Q101 and IATF 16949 traceability not present in the industrial-grade version.
SMAJ12AQ-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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 20.1A
- 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
SMAJ12AQ-13-F FAQ
1.How can I place an order for SMAJ12AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ12AQ-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 SMAJ12AQ-13-F reliable?
The price and inventory of SMAJ12AQ-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 SMAJ12AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ12AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ12AQ-13-F?
SMAJ12AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ12AQ-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 SMAJ12AQ-13-F?
For technical support, including SMAJ12AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12AQ-13-F requirements.
6.How does Aetrix verify that SMAJ12AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ12AQ-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 SMAJ12AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ12AQ-13-F?
All SMAJ12AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12AQ-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 SMAJ12AQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ12AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ12AQ-13-F Tags
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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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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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