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Diodes Incorporated SMAJ33AQ-13-F
- Part No.:
- SMAJ33AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33AQ-13-F.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:20,290
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Product details
Overview
SMAJ33AQ-13-F from Diodes Incorporated is a unidirectional 400W automotive transient voltage suppressor (TVS) diode with 33V reverse standoff voltage, 53.3V max clamping voltage at 7.5A peak pulse current, and AEC-Q101 qualification for under-hood electronics protection against ISO7637-2 Pulse 1/2a/3a/3b and ISO10605 ESD events.
For engineers reviewing the SMAJ33AQ-13-F datasheet, SMAJ33AQ-13-F pinout, SMAJ33AQ-13-F application, or SMAJ33AQ-13-F equivalent, this device serves as a primary surge protection component in 12V/24V automotive power rails, LIN/CAN transceiver interfaces, and body control module inputs where precise clamping, low leakage (<0.5µA), and IATF 16949 traceability are required.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp in series with the protected line, conducting only during negative transients exceeding its 33V VRWM threshold. Its glass-passivated die ensures stable breakdown behavior across -55°C to +175°C junction temperature range.
Clamping performance is defined by a 10×1000µs waveform per IEC 61000-4-5, delivering 53.3V VC at IPP = 7.5A while maintaining <0.5µA IR at VRWM - critical for low-power always-on automotive circuits such as door modules and sensor nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000µs surges up to 7.5A without failure |
| Reverse Standoff Voltage | 33V - blocks normal 12V/24V system voltages while triggering on transients ≥36.7V |
| Max Clamping Voltage | 53.3V @ 7.5A - limits downstream IC stress to safe levels during ISO7637-2 Pulse 1 (-100V) |
| Leakage Current | <0.5µA @ 33V - avoids battery drain in always-on vehicle networks |
| Operating Temp Range | -55°C to +175°C - supports engine compartment placement per AEC-Q101 stress testing |
| Package | SMA - surface-mount footprint compatible with automated SMT assembly and IPC-7351B land patterns |
Pinout & Package
Package: SMA (DO-214AC), molded plastic UL 94V-0 housing, 0.064g weight, cathode band polarity indicator. Moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path | Connected to ground or low-impedance chassis reference for unidirectional clamping |
| Cathode | Protected line input | Placed in series with supply rail; conducts when transient exceeds VRWM + VBR tolerance |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse rating | Enables robust protection against high-energy ISO7637-2 Pulse 1 (-100V) and Pulse 3a (-150V) without derating |
| AEC-Q101 qualified | Validated for automotive use with PPAP documentation and IATF 16949 manufacturing control |
| Glass-passivated die | Ensures stable VBR over temperature and lifetime, minimizing drift in harsh under-hood environments |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and automotive green standards (<900ppm Br/Cl, <1000ppm Sb) |
Applications
| Infotainment Power Rail Protection | CAN Transceiver ESD Clamp |
|---|---|
Use Scenario: Protecting 12V supply input to head unit MCU and display driver ICs from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fuse output and DC-DC converter input to clamp transients before regulation. Use Value: 53.3V clamping prevents overvoltage damage to 3.3V/5V logic supplies while maintaining <0.5µA leakage during sleep mode. | Use Scenario: Shielding high-speed CANH/CANL lines from contact discharge per ISO10605 (30kV). IC Role / Device Role / Timing Role: Bidirectional-capable package used as unidirectional clamp on CANH line referenced to battery ground. Use Value: Sub-1ns response time and 53.3V VC ensure CAN PHY remains within common-mode range during ESD events. |
| Body Control Module Input Protection | LED Headlamp Driver Surge Suppression |
Use Scenario: Safeguarding wake-up inputs (e.g., door handle sensors) connected to 12V battery rail. IC Role / Device Role / Timing Role: TVS mounted at connector interface to absorb ISO7637-2 Pulse 3b (+100V) induced on wiring harnesses. Use Value: 33V VRWM allows reliable blocking of nominal battery voltage while triggering on fast-rising transients. | Use Scenario: Protecting constant-current LED driver ICs from load dump surges during headlamp switching. IC Role / Device Role / Timing Role: Placed across input capacitor of buck controller to limit voltage overshoot during 12V-to-48V transitions. Use Value: 400W rating handles 8.3ms half-sine surges up to 40A without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-13-F | No AEC-Q101 qualification; standard industrial grade | Not approved for automotive PPAP; limited to non-safety-critical consumer/industrial use | Select only if automotive change control and IATF 16949 traceability are not required |
| SMCJ33A-Q | Higher 1500W PPK rating in larger SMC package; same VRWM/VC specs | Used where higher surge margin is needed (e.g., alternator output); requires larger PCB area | Choose when system-level testing shows 400W insufficient for worst-case load dump scenarios |
Compared with SMAJ33A-13-F, the AQ variant adds AEC-Q101 validation and PPAP support for automotive programs; compared with SMCJ33A-Q, it trades surge capacity for compact SMA footprint - ideal for space-constrained ECUs requiring certified protection.
Availability
SMAJ33AQ-13-F is available at Aetrix Electronics and suitable for automotive infotainment systems, body control modules, and LED lighting drivers requiring stable component supply with full AEC-Q101 compliance and IATF 16949 traceability.
Supply support for SMAJ33AQ-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.
The SMAJ(AQ) series is part of Diodes' automotive-grade TVS portfolio, designed specifically to meet ISO7637-2 and ISO10605 requirements for electronic control units operating in extreme under-hood environments.
FAQ
What is the difference between SMAJ33AQ-13-F and SMAJ33A-13-F?
The "AQ" suffix denotes AEC-Q101 qualification, PPAP capability, and manufacture in IATF 16949-certified facilities - essential for automotive Tier 1 suppliers. The standard "A" version lacks formal automotive qualification and associated documentation, making it unsuitable for safety-critical vehicle systems despite identical electrical specs.
Can SMAJ33AQ-13-F be used for bidirectional protection?
No - SMAJ33AQ-13-F is unidirectional only, indicated by absence of "C" in the part number. For bidirectional protection (e.g., data lines), use SMAJ33CAQ-13-F, which has symmetrical clamping for both polarities and no cathode band marking.
What is the maximum steady-state power dissipation at 75°C lead temperature?
PM(AV) is rated at 1.0W at TL = +75°C, derating linearly to zero at +175°C junction temperature. This defines continuous power handling in thermally constrained layouts - critical for placement near heat-generating components like power MOSFETs in motor control modules.
How does the 53.3V clamping voltage impact system design?
At 7.5A peak pulse current, 53.3V clamping ensures downstream regulators (e.g., 42V-input DC-DCs) remain within absolute maximum ratings during ISO7637-2 Pulse 1 (-100V). Designers must verify that the protected IC's input voltage rating exceeds 53.3V plus margin for layout-induced overshoot.
SMAJ33AQ-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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 7.5A
- 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
SMAJ33AQ-13-F FAQ
1.How can I place an order for SMAJ33AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33AQ-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 SMAJ33AQ-13-F reliable?
The price and inventory of SMAJ33AQ-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 SMAJ33AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ33AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33AQ-13-F?
SMAJ33AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33AQ-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 SMAJ33AQ-13-F?
For technical support, including SMAJ33AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33AQ-13-F requirements.
6.How does Aetrix verify that SMAJ33AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ33AQ-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 SMAJ33AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ33AQ-13-F?
All SMAJ33AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33AQ-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 SMAJ33AQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ33AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33AQ-13-F Tags
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