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Diodes Incorporated PSMAJ400A-13
- Part No.:
- PSMAJ400A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
PSMAJ400A-13.pdf
- Description:
- TVS DIODE 342VWM 548VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,980
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Product details
Overview
PSMAJ400A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in SMA package, rated for 342V reverse standoff voltage, 380V minimum breakdown voltage at 1mA, and clamps to 548V at 0.73A peak pulse current. It provides fast-response overvoltage protection for DC power rails in industrial power supplies and automotive ECUs.
For engineers reviewing the PSMAJ400A-13 datasheet, PSMAJ400A-13 pinout, PSMAJ400A-13 application, or PSMAJ400A-13 equivalent, key selection factors include its 400W peak pulse power rating, 5.0μA max reverse leakage at VRWM, 6.5V forward voltage at 25A surge, -55°C to +150°C operating temperature range, and RoHS-compliant lead-free matte tin plating.
Technical Context
This TVS diode operates in avalanche breakdown mode to clamp transient overvoltages above its specified VBR, with a fast response time (<1.0 ns) enabling protection against ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5). Its unidirectional configuration provides polarity-sensitive clamping on positive-going transients only.
The device uses silicon planar junction construction with a cathode band marking, housed in an UL 94V-0 molded plastic SMA case. Thermal derating follows a linear curve from 100% at +25°C to ~50% at +125°C ambient, supporting reliable operation under sustained thermal stress in enclosed power modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10/1000μs waveform surges without failure |
| Reverse Standoff Voltage (VRWM) | 342V - maximum continuous DC or RMS voltage before clamping initiates |
| Breakdown Voltage (VBR) | 380V min @ 1mA - precise avalanche threshold for predictable clamping onset |
| Clamping Voltage (VC) | 548V @ 0.73A - limits transient voltage seen by downstream circuitry |
| Operating Temperature | -55°C to +150°C - supports under-hood automotive and industrial environments |
| Moisture Sensitivity | Level 1 per J-STD-020 - no dry-pack or bake required prior to reflow |
| RoHS Compliance | Lead-free, halogen-free, antimony-free - meets EU Directive 2011/65/EU |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with cathode band polarity indicator; dimensions: 4.00–4.60 mm length × 2.29–2.92 mm width × 1.27–1.63 mm height; weight ≈ 0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side for unidirectional clamping | Connected to protected line; conducts during positive transients when cathode is biased higher |
| Cathode | Reference/ground side | Marked with band; tied to system ground or lower-potential rail to define clamping reference |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Enables robust protection against high-energy surges like ISO 7637-2 Pulse 5a without degradation |
| 548V clamping at 0.73A | Provides defined overvoltage ceiling for 300–400V DC bus systems |
| 6.5V forward voltage at 25A | Minimizes conduction loss during high-current forward surge events |
| UL 94V-0 flammability rating | Ensures flame-retardant behavior in safety-critical power enclosures |
| Level 1 moisture sensitivity | Eliminates pre-bake requirements, reducing SMT line downtime |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 380V DC intermediate bus in DIN-rail power supplies from load dump and switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input terminals to clamp positive overvoltage spikes. Use Value: Limits transient voltage to ≤548V, preventing damage to upstream rectifiers and downstream DC-DC controllers. | Use Scenario: Safeguarding LIN bus interface ICs in door module ECUs against battery reversal and jump-start surges. IC Role / Device Role / Timing Role: Polarity-aware clamping device connected between LIN line and chassis ground. Use Value: Blocks >342V reverse transients while allowing normal LIN signaling below VRWM. |
| Solar Inverter DC Link | Telecom Remote Radio Unit |
Use Scenario: Guarding IGBT gate drivers on 400V DC link against coupling-induced voltage spikes during switching. IC Role / Device Role / Timing Role: Fast-response TVS mounted near driver IC to minimize inductive loop area. Use Value: Clamps sub-10ns transients within 548V, preserving gate oxide integrity of sensitive drivers. | Use Scenario: Shielding PoE-powered Ethernet PHYs from induced surges on outdoor cable runs. IC Role / Device Role / Timing Role: Primary-level surge protector on DC input rail before DC-DC conversion stage. Use Value: Absorbs 400W pulses without failure, maintaining uninterrupted 48V power delivery during lightning events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ400A-13 (Bourns) | Same 342V VRWM, 380V VBR, but 550V VC @ 0.73A vs. 548V; 1.0W PM(AV) | Identical thermal profile and footprint; minor clamping variance within design margin | Select if Bourns supply chain preference or dual-sourcing requirement exists |
| SMCJ400A (Littelfuse) | Higher 1500W PPK rating, DO-214AB package (larger), same 342V VRWM and 548V VC | Requires PCB layout change; suited for higher-energy surge environments where 400W is marginal | Choose only when system-level surge testing exceeds IEC 61000-4-5 Level 4 |
Compared with SMAJ400A-13 and SMCJ400A, PSMAJ400A-13 offers identical electrical specs in a Diodes Incorporated-qualified SMA package with Level 1 moisture sensitivity-making it optimal for high-volume, cost-sensitive industrial SMT lines where board space and reflow simplicity are critical.
Availability
PSMAJ400A-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, solar inverter DC links, and telecom remote radio units requiring stable component supply and full traceability.
Supply support for PSMAJ400A-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, manufacturing, and sales operations across Asia, Europe, and North America.
The PSMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability, surface-mount overvoltage protection in automotive, industrial, and telecom infrastructure applications where compact size and consistent clamping performance are essential.
FAQ
What is the difference between PSMAJ400A-13 and PSMAJ400CA-13?
The "A" suffix denotes unidirectional operation with cathode band marking, while "C" indicates bidirectional configuration without polarity marking. PSMAJ400A-13 clamps only positive transients relative to ground; PSMAJ400CA-13 clamps both polarities, making it suitable for AC-coupled or floating signal lines where voltage reversals occur.
Can PSMAJ400A-13 be used in place of a 36V TVS in a 24V system?
No-PSMAJ400A-13 is rated for 342V VRWM and intended for 300–400V DC systems. Using it in a 24V application would leave excessive headroom, failing to protect against low-voltage transients like ESD or inductive kick. A PSMAJ36A-13 (36V VRWM) is the correct selection for 24V rail protection.
Does PSMAJ400A-13 meet AEC-Q200 stress test requirements?
No-PSMAJ400A-13 is not AEC-Q200 qualified. While it operates from -55°C to +150°C and is used in automotive ECUs, Diodes Incorporated does not list it in their AEC-Q200 stress-tested product catalog. For qualified automotive applications, consider the AEC-Q200-compliant D3V3M400Q-7 (same VRWM, qualified per Grade 1).
How does the 400W rating relate to real-world surge testing standards?
The 400W rating corresponds to a 10/1000μs double-exponential waveform per IEC 61000-4-5. At 0.73A peak current and 548V clamping, it satisfies Level 3 (2kV line-to-ground) testing for industrial equipment. It is not rated for repetitive surges-each event must be separated by ≥1 minute per datasheet duty cycle limits.
PSMAJ400A-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:
- 1
- Bidirectional Channels:
- -
- 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
PSMAJ400A-13 FAQ
1.How can I place an order for PSMAJ400A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for PSMAJ400A-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 PSMAJ400A-13 reliable?
The price and inventory of PSMAJ400A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PSMAJ400A-13 is usually 5 days.
3.What payment methods are accepted for PSMAJ400A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PSMAJ400A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PSMAJ400A-13?
PSMAJ400A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PSMAJ400A-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 PSMAJ400A-13?
For technical support, including PSMAJ400A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PSMAJ400A-13 requirements.
6.How does Aetrix verify that PSMAJ400A-13 is sourced from the original manufacturer or authorized distributors?
All PSMAJ400A-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 PSMAJ400A-13 meets industry standards.
7.What is the process for return or replacement of PSMAJ400A-13?
All PSMAJ400A-13 units undergo pre-shipment inspection (PSI). If there is an issue with PSMAJ400A-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 PSMAJ400A-13 part is unused and in its original packaging.
Return procedure for PSMAJ400A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PSMAJ400A-13 Tags
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