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Diodes Incorporated SMAJ33CAQ-13-F
- Part No.:
- SMAJ33CAQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CAQ-13-F.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:44,320
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Product details
Overview
SMAJ33CAQ-13-F from Diodes Incorporated is a bi-directional 400W automotive transient voltage suppressor (TVS) diode in SMA package, with 33V reverse standoff voltage (VRWM), 53.3V max clamping voltage (VC) at 7.5A peak pulse current, and AEC-Q101 qualification for under-hood power line protection against ISO7637-2 Pulse 1/2a/3a/3b and ISO10605 ESD events.
For engineers reviewing the SMAJ33CAQ-13-F datasheet, SMAJ33CAQ-13-F pinout, SMAJ33CAQ-13-F application, or SMAJ33CAQ-13-F equivalent, this part supports robust surge immunity design in 12V/24V automotive subsystems including body control modules, infotainment power rails, and sensor interface protection where bidirectional clamping and IATF 16949 traceability are required.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, delivering consistent clamping performance during negative- and positive-going transients per ISO7637-2 Pulse 1 (−100V), Pulse 2a (+50V), Pulse 3a (−150V), and Pulse 3b (+100V). Its glass-passivated junction ensures stable breakdown behavior over temperature.
Designed for automotive-grade reliability, it features −55°C to +175°C operating junction temperature range, 40A non-repetitive peak forward surge current (IFSM), and 1.0W steady-state power dissipation at TL = +75°C - enabling sustained operation in high-ambient engine bay environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000μs transients without failure in automotive load-dump or ESD events |
| Reverse Standoff Voltage (VRWM) | 33V - blocks normal 12V/24V system voltages while remaining inactive until surge exceeds threshold |
| Max Clamping Voltage (VC) | 53.3V @ IPP = 7.5A - limits downstream IC voltage to safe level during ISO7637-2 Pulse 1/3a surges |
| Breakdown Voltage (VBR) | 36.7V min / 40.6V max @ IT = 1.0mA - ensures precise, repeatable turn-on within specified tolerance band |
| Leakage Current (IR) | 0.5μA max @ VRWM - negligible standby power loss and no interference with low-power sensor biasing |
| Operating Temperature | −55°C to +175°C - validated for under-hood placement adjacent to ECUs, battery junction boxes, and lighting drivers |
Pinout & Package
Package: SMA (Surface Mount Axial), molded plastic UL 94V-0, moisture sensitivity level 1, 0.064g weight. Cathode band omitted - bi-directional symmetry confirmed by "C" suffix and absence of polarity marking per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional surge conduction path | Either terminal serves as input or return; no polarity dependency enables flexible PCB layout in differential or floating lines |
| Case / Body | Thermal and mechanical reference | Exposed copper pad on bottom provides primary heat path to PCB; requires thermal relief design for 1.0W continuous dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified & PPAP capable | Validated for automotive production use with full change control, lot traceability, and IATF 16949 manufacturing |
| Glass-passivated die construction | Eliminates surface contamination risks and ensures long-term VBR stability under thermal cycling and humidity |
| ISO10605 & ISO7637-2 compliance | Passes 30kV air/contact ESD and defined load-dump/surge pulses without parameter shift or parametric failure |
| Lead-free, halogen-free, RoHS 3 compliant | Meets EU Directive 2015/863/EU with Br+Cl <1500ppm and Sb <1000ppm - suitable for green vehicle programs |
Applications
| Body Control Module (BCM) Power Input | Automotive Infotainment Power Rail |
|---|---|
Use Scenario: Protects BCM 12V main supply from load dump (ISO7637-2 Pulse 1) and alternator-induced spikes during ignition cycling. IC Role / Device Role: Bi-directional TVS placed upstream of DC/DC converter input to clamp transients before regulation stage. Use Value: Limits voltage to ≤53.3V during −100V surge, preventing damage to buck controller ICs rated for 60V absolute maximum. |
Use Scenario: Shields USB-C and HDMI power delivery lines in head units from ESD events during user interaction (ISO10605 contact discharge). IC Role / Device Role: Bidirectional clamping device across VBUS and GND to shunt ±30kV ESD energy away from PMIC and USB transceivers. Use Value: Sub-10ns response time and 0.5μA leakage preserve signal integrity and prevent false resets in always-on audio subsystems. |
| Rear Camera Power Line Protection | LED Headlamp Driver Input |
Use Scenario: Secures 12V supply to rear-view camera module exposed to trunk harness surges during door slam or battery jump-start. IC Role / Device Role: Primary surge suppression element between connector and camera SoC's LDO input. Use Value: Withstands repeated 150V negative transients (ISO7637-2 Pulse 3a) without degradation, ensuring >15-year field life. |
Use Scenario: Guards constant-current LED driver IC input against load dump during headlamp on/off transitions in 24V commercial vehicles. IC Role / Device Role: High-energy TVS absorbing up to 400W pulse to protect gate drivers and current-sense amplifiers. Use Value: 40A IFSM rating handles worst-case 8.3ms half-sine surges without bond wire fusing or thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-Q | Uni-directional; lacks cathode-band omission and symmetrical clamping - requires correct orientation during placement | Only suitable for unidirectional rails (e.g., battery-positive referenced systems); not valid for floating or AC-coupled lines | Select only if circuit topology guarantees fixed polarity and space constraints prohibit dual-terminal symmetry |
| TPSMD33C | Same VRWM/VC but higher 600W PPK; larger SMC package (7.1mm × 6.2mm vs SMA 4.6mm × 2.9mm) | Offers higher surge margin but consumes ~2.5× PCB area; incompatible with existing SMA footprints | Choose when system-level testing reveals marginal margin with 400W rating, and board re-layout is feasible |
Compared with SMAJ33A-Q, SMAJ33CAQ-13-F eliminates orientation risk and supports floating-line protection; versus TPSMD33C, it delivers identical clamping performance in 40% smaller footprint - critical for space-constrained ADAS camera modules and compact ECU designs.
Availability
SMAJ33CAQ-13-F is available at Aetrix Electronics and suitable for automotive body electronics, infotainment power management, and ADAS sensor protection requiring stable component supply, full AEC-Q101 documentation, and IATF 16949 traceability.
Supply support for SMAJ33CAQ-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 with ISO/TS 16949 and IATF 16949 certified facilities.
The SMAJ series targets automotive transient suppression with AEC-Q101 validation, ISO7637-2/ISO10605 compliance, and optimized thermal performance for under-hood deployment - designed specifically for 12V/24V vehicle electrical architectures.
FAQ
Is SMAJ33CAQ-13-F unidirectional or bidirectional?
SMAJ33CAQ-13-F is bi-directional, confirmed by the "C" suffix in its part number and explicit omission of cathode band marking per datasheet Figure 1. It clamps symmetrically for both positive and negative transients, making it suitable for floating or AC-coupled automotive signal/power lines without polarity concerns.
What is the maximum clamping voltage under ISO7637-2 Pulse 1 conditions?
Under ISO7637-2 Pulse 1 (−100V, 50Ω source impedance), SMAJ33CAQ-13-F clamps to ≤53.3V at 7.5A peak pulse current (IPP), as specified in the Electrical Characteristics table. This value is measured using the standardized 10×1000μs waveform and ensures downstream ICs see voltage limited well below their 60V absolute maximum ratings.
Does this part meet RoHS 3 and halogen-free requirements?
Yes - SMAJ33CAQ-13-F complies with EU Directive 2015/863/EU (RoHS 3), contains <900ppm bromine, <900ppm chlorine (<1500ppm total Br+Cl), and <1000ppm antimony, satisfying Diodes' "Green" product definition. Matte tin lead finish meets MIL-STD-202 solderability requirements.
Can SMAJ33CAQ-13-F replace SMAJ33A-Q in an existing design?
No direct replacement: SMAJ33A-Q is unidirectional and requires correct cathode orientation, whereas SMAJ33CAQ-13-F is bidirectional with no polarity marking. Swapping requires verification that the circuit does not rely on DC blocking behavior and that layout accommodates symmetrical terminal routing - revalidation per ISO7637-2 is mandatory.
SMAJ33CAQ-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:
- -
- Bidirectional Channels:
- 1
- 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
SMAJ33CAQ-13-F FAQ
1.How can I place an order for SMAJ33CAQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CAQ-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 SMAJ33CAQ-13-F reliable?
The price and inventory of SMAJ33CAQ-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 SMAJ33CAQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ33CAQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CAQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CAQ-13-F?
SMAJ33CAQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CAQ-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 SMAJ33CAQ-13-F?
For technical support, including SMAJ33CAQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CAQ-13-F requirements.
6.How does Aetrix verify that SMAJ33CAQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ33CAQ-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 SMAJ33CAQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ33CAQ-13-F?
All SMAJ33CAQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CAQ-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 SMAJ33CAQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ33CAQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33CAQ-13-F Tags
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