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Diodes Incorporated PSMAJ400CA-13
- Part No.:
- PSMAJ400CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
PSMAJ400CA-13.pdf
- Description:
- TVS DIODE 342VWM 548VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:464
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Product details
Overview
PSMAJ400CA-13 from Diodes Incorporated is a bidirectional 400W surface-mount transient voltage suppressor (TVS) diode in SMA package, designed for clamping ESD and surge transients on data lines and power rails. It features 342V reverse standoff voltage, 548V max clamping voltage at 0.73A peak pulse current, and operates from –55°C to +150°C ambient.
For engineers reviewing the PSMAJ400CA-13 datasheet, PSMAJ400CA-13 pinout, PSMAJ400CA-13 application, or PSMAJ400CA-13 equivalent, key selection criteria include clamping voltage vs. IPP, unidirectional/bidirectional configuration, thermal derating above +25°C, and RoHS-compliant lead-free plating for reflow compatibility.
Technical Context
This TVS diode uses an avalanche breakdown mechanism to clamp transient overvoltages within nanoseconds. Its bidirectional construction enables symmetric protection on AC-coupled or floating signal paths without polarity dependency.
It complies with IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) immunity standards when applied with proper PCB layout and series impedance. The 1.0W steady-state power rating supports continuous leakage management at elevated ambient temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 1ms 10/1000μs waveform surges without failure |
| Reverse Standoff Voltage (VRWM) | 342V - maximum continuous DC or RMS voltage before significant leakage |
| Clamping Voltage (VC) | 548V @ 0.73A - limits transient voltage seen by downstream circuitry |
| Breakdown Voltage (VBR) | 380–420V @ 1mA - defines onset of avalanche conduction |
| Operating Temperature | –55°C to +150°C - validated junction temperature range for industrial environments |
| Moisture Sensitivity | Level 1 per J-STD-020 - no dry-pack or bake required prior to SMT assembly |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with UL 94V-0 flammability rating and matte tin-plated terminals. Cathode band omitted due to bidirectional construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; no polarity orientation required during placement |
| Case | Thermal and mechanical interface | Plastic body provides electrical isolation and transfers heat to PCB copper via soldered leads |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses, or floating nodes without polarity constraints |
| 400W peak pulse rating | Meets IEC 61000-4-5 Level 4 (4kV line-to-line) surge requirements with margin |
| Lead-free & halogen-free | Complies with RoHS 2 and JEDEC green standards; compatible with Pb-free reflow profiles |
| Fast response time | <1ns turn-on ensures suppression before sensitive ICs experience overstress |
Applications
| Industrial Sensor Interface | Automotive CAN Bus Protection |
|---|---|
Use Scenario: Protecting 4–20mA current-loop transmitters against lightning-induced surges on factory floor wiring. IC Role / Device Role / Timing Role: Bidirectional TVS placed across loop terminals to shunt transients before reaching analog front-end. Use Value: Clamps induced surges up to 400W while maintaining 342V standoff for normal loop operation. | Use Scenario: Safeguarding CANH/CANL differential pair in automotive body control modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Symmetric transient suppressor mounted directly at connector entry point. Use Value: Limits differential surge voltage to ≤548V, preserving CAN transceiver integrity during 10/1000μs transients. |
| USB 2.0 Data Line Protection | AC-DC Adapter Input Stage |
Use Scenario: ESD protection for D+/D− lines in USB peripheral devices subjected to ±8kV contact discharge per IEC 61000-4-2. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed inline with data traces near connector. Use Value: Sub-1ns response prevents ESD energy from coupling into USB PHY, with minimal signal distortion. | Use Scenario: Secondary-side transient suppression on DC output rails of wall adapters handling brownouts and switching noise. IC Role / Device Role / Timing Role: Clamp device across +VOUT and GND to absorb inductive kickback from regulator feedback loops. Use Value: Absorbs 400W surges without degradation, supporting long-term reliability in consumer power supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ400CA-13 (Bourns) | Same SMA package, identical 342V VRWM and 548V VC, but rated for 400W at TA = +25°C only (no extended temp spec) | Limited to commercial-grade ambient conditions; not qualified for –55°C operation | Select if operating temperature stays within 0°C–70°C and cost sensitivity outweighs extended qualification |
| P6SMB400CA (Littelfuse) | Same electrical specs but in larger SMB package (4.5 × 3.9 mm); 1.5W steady-state rating vs. 1.0W | Requires more PCB area; better thermal dissipation for high-duty-cycle surge events | Choose when board space permits and higher continuous power handling is needed |
Compared with SMAJ400CA-13 and P6SMB400CA, PSMAJ400CA-13 offers full industrial temperature qualification (–55°C to +150°C) in the compact SMA footprint, making it optimal for space-constrained, wide-temperature deployments where bidirectional clamping is mandatory.
Availability
PSMAJ400CA-13 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive CAN bus protection, and USB 2.0 data line protection requiring stable component supply across extended temperature ranges and RoHS-compliant manufacturing.
Supply support for PSMAJ400CA-13 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 and manufacturing operations across Asia and the Americas.
The PSMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability, surface-mount surge protection in industrial, automotive, and communications infrastructure applications.
FAQ
What does the 'C' suffix in PSMAJ400CA-13 indicate?
The 'C' denotes bidirectional configuration, meaning the device provides symmetrical clamping for both positive and negative transients. Unlike unidirectional versions (e.g., PSMAJ400A-13), it has no cathode band and can be mounted without polarity consideration-ideal for AC-coupled or differential signal lines.
Can PSMAJ400CA-13 replace a unidirectional TVS in a DC power rail?
Yes, but with trade-offs: its bidirectional structure allows use on DC rails, yet its 342V standoff applies equally to both polarities-so reverse-biased operation must remain below that threshold. For pure DC applications with strong polarity certainty, a unidirectional part may offer tighter clamping margin.
How does the 400W rating translate to real-world surge immunity?
The 400W rating corresponds to a single 1ms 10/1000μs waveform per IEC 61000-4-5. At 0.73A peak current and 548V clamping, it protects against 4kV line-to-line surges when used with appropriate series impedance (e.g., ≥2Ω) and PCB layout-verified in Diodes' application note AP02002.
Is PSMAJ400CA-13 suitable for automotive under-hood applications?
Yes-it is qualified for –55°C to +150°C operating junction temperature and meets AEC-Q200 stress test requirements for passive components. Its halogen-free, RoHS-compliant construction and robust surge capability make it appropriate for engine control units, body modules, and infotainment power domains.
PSMAJ400CA-13 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):
- 342V
- Voltage - Breakdown (Min):
- 380V
- Voltage - Clamping (Max) @ Ipp:
- 548V
- Current - Peak Pulse (10/1000µs):
- 730mA
- 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
PSMAJ400CA-13 FAQ
1.How can I place an order for PSMAJ400CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for PSMAJ400CA-13 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 PSMAJ400CA-13 reliable?
The price and inventory of PSMAJ400CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PSMAJ400CA-13 is usually 5 days.
3.What payment methods are accepted for PSMAJ400CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PSMAJ400CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PSMAJ400CA-13?
PSMAJ400CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PSMAJ400CA-13 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 PSMAJ400CA-13?
For technical support, including PSMAJ400CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PSMAJ400CA-13 requirements.
6.How does Aetrix verify that PSMAJ400CA-13 is sourced from the original manufacturer or authorized distributors?
All PSMAJ400CA-13 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 PSMAJ400CA-13 meets industry standards.
7.What is the process for return or replacement of PSMAJ400CA-13?
All PSMAJ400CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with PSMAJ400CA-13, 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 PSMAJ400CA-13 part is unused and in its original packaging.
Return procedure for PSMAJ400CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PSMAJ400CA-13 Tags
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Diodes Incorporated
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