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Diodes Incorporated SMAJ33CA-13-F
- Part No.:
- SMAJ33CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CA-13-F.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:376,539
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Product details
Overview
SMAJ33CA-13-F from Diodes Incorporated is a bidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for 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 ns). Used in automotive infotainment power rails and industrial sensor I/O protection.
For engineers reviewing the SMAJ33CA-13-F datasheet, SMAJ33CA-13-F pinout, SMAJ33CA-13-F application, or SMAJ33CA-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, peak pulse current capability under ISO 7637-2 Pulse 1/2a/5a waveforms, unidirectional vs. bidirectional polarity requirements, and SMA package thermal derating above +25°C ambient.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified at 36.7–40.6V under 1mA test current. Its glass-passivated junction ensures stable leakage performance (≤5µA at VRWM) and robust surge handling up to 40A peak forward surge current (IFSM).
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) immunity standards. Thermal performance is characterized by a -55°C to +150°C operating junction temperature range and 1.0W steady-state power dissipation at TL = +75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - Sustains single 8.3ms half-sine surges without failure per IEC 61000-4-5. |
| Reverse Standoff Voltage (VRWM) | 33V - Maximum continuous DC or RMS voltage before significant leakage begins. |
| Clamping Voltage (VC) | 53.3V @ IPP = 7.5A - Limits transient voltage seen by downstream circuitry during surge events. |
| Breakdown Voltage (VBR) | 36.7–40.6V @ IT = 1mA - Confirms symmetrical conduction threshold for bidirectional operation. |
| Leakage Current (IR) | ≤5µA @ VRWM - Ensures minimal standby power loss and no false triggering on nominal supply rails. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated assembly; 2.29–2.92mm height. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band absent (bidirectional configuration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; no polarity dependency-enables placement flexibility on PCB. |
| Case | Thermal and mechanical interface | Plastic body provides electrical isolation; solderable matte tin terminals meet MIL-STD-202 Method 208. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Handles high-energy transients such as load dump (ISO 7637-2 Pulse 5a) without degradation. |
| Glass-passivated die | Ensures long-term reliability and stable VBR/VC parameters across temperature and lifetime. |
| Bidirectional configuration | Protects AC-coupled or floating signal lines (e.g., RS-485, CAN FD bus) without polarity constraints. |
| RoHS-compliant & halogen-free | Meets automotive and industrial environmental compliance requirements (Br+Cl <1500ppm, Sb <1000ppm). |
Applications
| Automotive Infotainment Power Rail | Industrial RS-485 Communication Port |
|---|---|
Use Scenario: Protects 12V supply input of head unit against load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converter input. Use Value: Clamps transients to ≤53.3V, maintaining safe margin below 60V-rated input capacitors and MOSFETs. |
Use Scenario: Shields differential RS-485 transceiver (e.g., MAX1487) from ESD and cable-induced surges. IC Role / Device Role / Timing Role: Bidirectional line protector between bus and transceiver pins A/B. Use Value: Symmetrical clamping preserves signal integrity during ±8kV contact ESD (IEC 61000-4-2) without polarity bias. |
| Smart Meter AC/DC Power Supply | Medical Sensor Interface |
Use Scenario: Guards auxiliary 5V rail derived from mains-connected SMPS against lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-stage TVS after primary MOV, before LDO regulator. Use Value: 7.5A IPP rating supports coordination with upstream 10kA MOVs per IEC 61643-11. |
Use Scenario: Safeguards analog front-end inputs of patient-monitoring ECG amplifier from defibrillator discharge coupling. IC Role / Device Role / Timing Role: Low-capacitance (≈25pF) bidirectional clamp on isolated sensor leads. Use Value: Sub-1ns response prevents >53.3V excursion from reaching precision op-amp inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33C-13-F (Diodes) | No "A" suffix - non-automotive grade; identical electrical specs but not PPAP-capable or AEC-Q200 qualified. | Lacks automotive change control documentation and IATF 16949 traceability. | Select only for non-automotive industrial or consumer designs where qualification is not required. |
| SMBJ33CA (Littelfuse) | Same VRWM/VC/IPP ratings but SMB package (DO-214AA); 30% larger footprint and higher thermal resistance. | Requires PCB layout revision; lower power density limits use in space-constrained modules. | Choose when existing SMB land pattern exists or higher thermal mass is needed for repetitive surge duty. |
Compared with SMAJ33C-13-F, the "A" suffix confirms AEC-Q200 qualification and PPAP readiness; versus SMBJ33CA, the SMA package enables tighter board layouts while maintaining identical clamping performance and surge capability.
Availability
SMAJ33CA-13-F is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial communication ports, and smart meter power supplies requiring stable component supply with full automotive qualification traceability.
Supply support for SMAJ33CA-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.
This device belongs to Diodes' SMAJ series of high-power TVS diodes engineered specifically for automotive-grade transient suppression in harsh environments, supporting AEC-Q200 qualification and IATF 16949 production.
FAQ
What does the "CA" suffix indicate in SMAJ33CA-13-F?
The "C" denotes bidirectional configuration, and the "A" indicates AEC-Q200 qualification, PPAP capability, and manufacture in an IATF 16949-certified facility. This distinguishes it from standard-grade SMAJ33C-13-F, which lacks automotive qualification documentation and traceability.
Can SMAJ33CA-13-F be used in place of a unidirectional TVS like SMAJ33A-13-F?
No - SMAJ33CA-13-F is bidirectional and lacks polarity marking; substituting it for a unidirectional part risks incorrect clamping behavior in DC-biased circuits. Unidirectional devices conduct only during reverse overvoltage, while this part clamps in both directions, potentially disrupting normal DC operation.
What is the maximum allowable junction temperature during surge events?
The absolute maximum junction temperature is +150°C. During a single 8.3ms surge, self-heating is transient and typically stays within safe limits if ambient temperature remains ≤+85°C. Continuous operation above +125°C requires thermal derating per Figure 1 in DS19005 Rev. 19-2.
How does the SMA package compare thermally to SMB or SMC packages in sustained power dissipation?
The SMA package has higher thermal resistance (RθJA ≈ 150°C/W typical) than SMB (≈120°C/W) or SMC (≈80°C/W). At 1.0W steady-state dissipation, SMAJ33CA-13-F reaches ~225°C junction rise above ambient - thus it is rated for 1.0W only at TL = +75°C, not TA = +25°C, per datasheet Fig. 6.
SMAJ33CA-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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ33CA-13-F FAQ
1.How can I place an order for SMAJ33CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CA-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 SMAJ33CA-13-F reliable?
The price and inventory of SMAJ33CA-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 SMAJ33CA-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ33CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CA-13-F?
SMAJ33CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CA-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 SMAJ33CA-13-F?
For technical support, including SMAJ33CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CA-13-F requirements.
6.How does Aetrix verify that SMAJ33CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ33CA-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 SMAJ33CA-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ33CA-13-F?
All SMAJ33CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CA-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 SMAJ33CA-13-F part is unused and in its original packaging.
Return procedure for SMAJ33CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33CA-13-F Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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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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