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Diodes Incorporated SMAJ33A-13-F
- Part No.:
- SMAJ33A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33A-13-F.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:149,967
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Product details
Overview
SMAJ33A-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 33V reverse standoff voltage (VRWM), 53.3V maximum clamping voltage at 7.5A peak pulse current, and fast response time (<1 ps). Used in automotive body control modules to protect CAN transceiver I/O against ISO 7637-2 load dump and ESD events.
For engineers reviewing the SMAJ33A-13-F datasheet, SMAJ33A-13-F pinout, SMAJ33A-13-F application, or SMAJ33A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, peak pulse current capability under 8.3ms half-sine surge, thermal derating above +25°C ambient, and compatibility with automated SMT reflow profiles for SMA package.
Technical Context
This TVS operates as a voltage-clamped shunt protector: under normal bias (≤33V), leakage remains ≤5µA; during transient overvoltage exceeding breakdown (36.7–40.6V), it avalanches to clamp voltage ≤53.3V within picoseconds. Its glass-passivated junction ensures stable breakdown characteristics and low capacitance (≈100pF at 1MHz, 0V bias).
The device is rated for 40A non-repetitive forward surge (8.3ms half-sine), 1.0W steady-state power dissipation at lead temperature +75°C, and operates across –55°C to +150°C junction temperature range-meeting requirements for under-hood automotive electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (non-repetitive, 8.3ms waveform; defines maximum transient energy absorption without failure) |
| Reverse Standoff Voltage | 33V (maximum continuous DC or RMS voltage applied without significant conduction) |
| Breakdown Voltage | 36.7–40.6V @ 1mA (avalanche initiation range; sets minimum clamping threshold) |
| Clamping Voltage | 53.3V @ 7.5A IPP (maximum voltage seen by protected circuit during specified surge) |
| Peak Pulse Current | 7.5A (maximum surge current supported while maintaining clamping ≤53.3V) |
| Junction Temperature Range | –55°C to +150°C (enables deployment in engine bay, powertrain, and industrial motor drives) |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating; cathode band denotes polarity on unidirectional devices; weight ≈0.064g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during reverse-biased clamping | Connected to protected line (e.g., CAN_H); sinks surge current to ground via cathode |
| Cathode | Current exit terminal during clamping; marked with band | Connected to system ground or low-impedance return path; establishes reference for clamping action |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Supports robust protection against ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a (load dump) in 12V systems |
| Glass-passivated die | Ensures stable, repeatable avalanche characteristics and long-term reliability under thermal cycling |
| Fast response time (<1 ps) | Clamps transients before sensitive downstream ICs (e.g., CAN transceivers, microcontrollers) experience overstress |
| RoHS-compliant, halogen-free | Meets automotive and industrial environmental compliance mandates (AEC-Q101 qualified variant available) |
Applications
| Automotive Body Control Module | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceiver pins against battery feed transients and ESD in door module ECUs. IC Role / Device Role / Timing Role: Shunt TVS clamping transient energy away from LIN PHY input/output pins during ignition switching noise. Use Value: Maintains LIN communication integrity by limiting voltage to ≤53.3V during 7.5A surges-well below LIN transceiver absolute max rating of 60V. |
Use Scenario: Safeguarding 24V digital input channels on programmable logic controller backplanes exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact inputs subject to inductive kickback from solenoid loads. Use Value: Absorbs 400W surge energy without degradation, enabling reliable operation across extended temperature range (–40°C to +85°C ambient). |
| DC Power Rail Protection | USB Port ESD Suppression |
Use Scenario: Secondary protection on 3.3V/5V SMPS output rails feeding FPGA or MCU core supplies. IC Role / Device Role / Timing Role: Fast-acting clamp limiting overshoot during regulator startup or load-step transients. Use Value: Clamps to 53.3V-providing ≥2× margin above 33V VRWM-while adding only ~100pF capacitance that avoids signal integrity impact. |
Use Scenario: Board-level ESD protection on USB 2.0 D+ and D– lines in embedded host controllers. IC Role / Device Role / Timing Role: Low-capacitance TVS placed adjacent to connector to divert IEC 61000-4-2 ±15kV contact discharge. Use Value: Sub-100pF capacitance preserves USB 2.0 eye diagram integrity; 53.3V clamping prevents PHY latch-up during ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA-13-F | Bidirectional version; symmetric clamping for AC-coupled or differential lines (e.g., RS-485) | Required where both polarities of transient must be suppressed (e.g., telecom line interface) | Select when protecting bidirectional signals; not suitable for DC-biased unidirectional rails due to dual-breakdown behavior |
| SMCJ33A | Higher 1500W peak power rating; larger SMC (DO-214AB) package; 53.3V clamping same | Used where higher surge energy (e.g., 10/1000µs waveform) exceeds SMAJ's 400W limit | Choose for industrial mains-connected equipment needing IEC 61000-4-5 Level 4 immunity; requires larger PCB footprint |
Compared with SMAJ33CA-13-F, this unidirectional variant offers lower leakage and simpler biasing for DC rails; versus SMCJ33A, it trades surge capacity for compact SMA footprint-critical for space-constrained automotive modules.
Availability
SMAJ33A-13-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, DC power rail protection, and USB interface ESD suppression requiring stable component supply and full traceability.
Supply support for SMAJ33A-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability automotive and industrial overvoltage protection-emphasizing AEC-Q101 qualification, tight parameter tolerances, and robust thermal performance.
FAQ
What is the maximum clamping voltage of SMAJ33A-13-F at its rated peak pulse current?
The maximum clamping voltage is 53.3V at 7.5A peak pulse current (IPP), measured using the standard 8.3ms half-sine waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and represents the highest voltage imposed on the protected circuit during surge conditions.
Is SMAJ33A-13-F suitable for automotive applications?
Yes-this part is manufactured in IATF 16949-certified facilities and has an automotive-qualified counterpart (SMAJ33AQ) meeting AEC-Q101. While the -13-F suffix denotes standard commercial qualification, its electrical specs, thermal range (–55°C to +150°C), and construction align with under-hood and body electronics requirements.
How does the SMA package affect thermal performance in high-density PCB layouts?
The SMA (DO-214AC) package delivers 1.0W steady-state power dissipation at TL = +75°C, but thermal resistance rises significantly in confined layouts. With no copper pour, θJA exceeds 100°C/W; adding ≥100mm² of 2oz copper on both sides reduces θJA to ~50°C/W-essential for sustained surge duty cycles.
Can SMAJ33A-13-F replace SMAJ36A in a 33V system?
No-SMAJ36A has 36V VRWM and 58.1V clamping, creating insufficient margin between operating voltage and clamping level in a 33V system. SMAJ33A's 33V VRWM and 53.3V clamping provide optimal 20.3V headroom, whereas SMAJ36A would risk premature conduction during normal 33V transients like cold-crank dips.
SMAJ33A-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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ33A-13-F FAQ
1.How can I place an order for SMAJ33A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33A-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 SMAJ33A-13-F reliable?
The price and inventory of SMAJ33A-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 SMAJ33A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ33A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33A-13-F?
SMAJ33A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33A-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 SMAJ33A-13-F?
For technical support, including SMAJ33A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33A-13-F requirements.
6.How does Aetrix verify that SMAJ33A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ33A-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 SMAJ33A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ33A-13-F?
All SMAJ33A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33A-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 SMAJ33A-13-F part is unused and in its original packaging.
Return procedure for SMAJ33A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33A-13-F Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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