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Diodes Incorporated SMAJ22AQ-13-F
- Part No.:
- SMAJ22AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22AQ-13-F.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:9,592
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Product details
Overview
SMAJ22AQ-13-F from Diodes Incorporated is a unidirectional 400W automotive transient voltage suppressor (TVS) diode with 22V reverse standoff voltage, 35.5V max clamping voltage at 11.2A peak pulse current, and AEC-Q101 qualification. It protects CAN, LIN, and sensor interface circuits in engine control units and body electronics against ISO7637-2 Pulse 1/2a/3a/3b transients and ISO10605 ESD events.
For engineers reviewing the SMAJ22AQ-13-F datasheet, SMAJ22AQ-13-F pinout, SMAJ22AQ-13-F application, or SMAJ22AQ-13-F equivalent, this page delivers verified electrical parameters, automotive-grade reliability data, clamping performance under standardized surge waveforms, and direct substitution guidance for ISO-compliant circuit protection design.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, activated when reverse voltage exceeds 22V VRWM and fully clamping within nanoseconds to limit downstream voltage to ≤35.5V at 11.2A (10×1000μs waveform). Its glass-passivated junction ensures stable breakdown and low leakage (<0.5μA at VRWM).
Designed for automotive power rail and signal line protection, it meets IATF 16949 manufacturing requirements and supports PPAP documentation. Thermal derating follows JEDEC J-STD-020 Level 1 moisture sensitivity, with steady-state power dissipation rated at 1.0W at TL = +75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000μs surges per ISO7637-2 without failure |
| Reverse Standoff Voltage | 22V - blocks normal 12V/24V automotive system voltages while remaining inactive |
| Max Clamping Voltage | 35.5V @ IPP = 11.2A - limits transient voltage to safe levels for 3.3V/5V logic interfaces |
| Breakdown Voltage | 24.4–26.9V @ IT = 1.0mA - tight VBR tolerance ensures predictable turn-on behavior |
| Leakage Current | <0.5μA @ VRWM - negligible standby power loss in always-on vehicle modules |
| Operating Temperature | −55°C to +175°C - supports under-hood placement in ECUs and ADAS sensors |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic UL 94V-0 housing, cathode band polarity indicator, 0.064g mass. Moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path to complete clamping loop |
| Cathode | High-side connection point | Connected to protected line (e.g., CAN_H, LIN, battery feed); cathode band marks this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use across temperature, humidity, and mechanical stress profiles |
| Glass-passivated die | Ensures long-term stability of VBR and low parametric drift over 15+ year vehicle lifetimes |
| Lead-free & halogen-free | Meets RoHS 3 and automotive "Green" standards (Br+Cl <1500ppm, Sb <1000ppm) |
| ISO7637-2 & ISO10605 compliant | Guaranteed performance against defined load dump, inductive switching, and ESD threats |
Applications
| Engine Control Unit (ECU) | CAN Bus Interface |
|---|---|
Use Scenario: Protection of microcontroller I/O pins and power rails against load dump transients during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 12V supply rail and ground, triggered only during negative-going surges. Use Value: Limits voltage excursion to ≤35.5V, preventing latch-up or gate oxide damage in 3.3V/5V MCU peripherals. |
Use Scenario: Surge suppression on CAN_H and CAN_L lines exposed to wiring harness coupling and ESD events. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SMAJ22AQ-13-F used on single-ended supply side (e.g., CAN transceiver VCC rail). Use Value: Maintains CAN signal integrity by clamping supply rail spikes before they disrupt transceiver biasing. |
| Body Control Module (BCM) | Automotive Sensor Interface |
Use Scenario: Input protection for LIN bus master nodes connected to door modules and lighting controllers. IC Role / Device Role / Timing Role: Unidirectional clamp on LIN supply line, absorbing Pulse 2a (+50V) and Pulse 3b (+100V) per ISO7637-2. Use Value: Prevents false wake-up or reset of LIN transceivers during vehicle power cycling and relay switching. |
Use Scenario: Protection of analog front-end inputs for pressure, temperature, and position sensors in harsh under-hood environments. IC Role / Device Role / Timing Role: Low-leakage (≤0.5μA) standoff device placed upstream of precision ADC reference paths. Use Value: Preserves sensor accuracy by eliminating DC error from leakage while blocking transient-induced offset shifts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-13-F | No AEC-Q101 qualification; standard industrial grade | Not approved for automotive PPAP; unsuitable for safety-critical modules | Select only for non-automotive prototypes or cost-sensitive consumer designs |
| SMCJ22A-Q | Higher 1500W peak power; SMC (DO-214AB) package; same VRWM/Vc | Larger footprint; better for high-energy load dump; requires PCB area rework | Choose when system-level testing shows 400W insufficient for worst-case Pulse 1 (−100V) |
Compared with SMAJ22A-13-F, SMAJ22AQ-13-F adds AEC-Q101 validation and IATF 16949 traceability-critical for Tier 1 production. Versus SMCJ22A-Q, it trades power headroom for space-constrained layouts in compact ECUs and sensor housings.
Availability
SMAJ22AQ-13-F is available at Aetrix Electronics and suitable for engine control units, CAN/LIN communication interfaces, and automotive sensor modules requiring stable component supply across extended vehicle lifecycles.
Supply support for SMAJ22AQ-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 ICs, specializing in high-reliability components for automotive, industrial, and computing markets.
This device belongs to the SMAJ-AQ automotive TVS diode family, engineered specifically for ISO7637-2 and ISO10605 compliance in safety-critical vehicle subsystems.
FAQ
What is the difference between SMAJ22AQ-13-F and SMAJ22A-13-F?
SMAJ22AQ-13-F is AEC-Q101 qualified, manufactured in IATF 16949-certified facilities, and PPAP-capable-required for automotive production. SMAJ22A-13-F lacks these qualifications and is intended for industrial or commercial use only. Both share identical electrical specs including VRWM = 22V and VC = 35.5V.
Can SMAJ22AQ-13-F be used for bidirectional protection?
No. SMAJ22AQ-13-F is unidirectional, indicated by the absence of "C" in its part number. For bidirectional protection (e.g., AC signal lines), use SMAJ22CAQ-13-F, which has symmetrical clamping in both polarities and no cathode band marking.
What is the maximum allowable ambient temperature for continuous operation?
The device operates continuously from −55°C to +175°C junction temperature. At TA = +25°C, PM(AV) = 1.0W. Derating begins above +25°C ambient; at +75°C ambient, power must be reduced to maintain TJ ≤ +175°C per the steady-state derating curve in DS40739 Figure 6.
Does this TVS diode require a heatsink in typical automotive applications?
No external heatsink is required. The SMA package's thermal resistance (RθJA ≈ 125°C/W) and 1.0W steady-state rating are sufficient when mounted on standard 1-oz copper PCB pads per Diodes' recommended layout. High-frequency surge duty cycles do not accumulate thermal mass due to non-repetitive nature of ISO7637-2 pulses.
SMAJ22AQ-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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 11.2A
- 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
SMAJ22AQ-13-F FAQ
1.How can I place an order for SMAJ22AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22AQ-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 SMAJ22AQ-13-F reliable?
The price and inventory of SMAJ22AQ-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 SMAJ22AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ22AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22AQ-13-F?
SMAJ22AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22AQ-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 SMAJ22AQ-13-F?
For technical support, including SMAJ22AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22AQ-13-F requirements.
6.How does Aetrix verify that SMAJ22AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ22AQ-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 SMAJ22AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ22AQ-13-F?
All SMAJ22AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22AQ-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 SMAJ22AQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ22AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22AQ-13-F Tags
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