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Diodes Incorporated PSMAJ440A-13
- Part No.:
- PSMAJ440A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
PSMAJ440A-13.pdf
- Description:
- TVS DIODE 376VWM 602VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
PSMAJ440A-13 from Diodes Incorporated is a 400W surface-mount transient voltage suppressor (TVS) diode designed for unidirectional overvoltage protection in DC power lines and signal interfaces. It features a 376V reverse standoff voltage, 418V minimum breakdown voltage at 1mA, 602V maximum clamping voltage at 0.66A peak pulse current, and operates from –55°C to +150°C - deployed in industrial power supplies and automotive ECUs.
For engineers reviewing the PSMAJ440A-13 datasheet, PSMAJ440A-13 pinout, PSMAJ440A-13 application, or PSMAJ440A-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, 8.3ms surge current rating (40A), thermal derating above +25°C, and SMA package compatibility with automated SMT assembly.
Technical Context
This unidirectional TVS diode uses an avalanche junction structure optimized for fast response (<1 ns) to ESD and lightning-induced transients. Its 602V clamping voltage at 0.66A ensures robust protection of downstream 3.3V–48V logic and analog circuits without overstressing gate oxides or supply rails.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) immunity requirements when properly laid out with low-inductance PCB traces. Its 1.0W steady-state power dissipation at TL = +120°C supports continuous operation in thermally constrained enclosures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (non-repetitive, 10/1000µs waveform) |
| Reverse Standoff Voltage | 376V (maximum continuous DC or RMS voltage before conduction) |
| Breakdown Voltage | 418V min @ 1mA (avalanche onset threshold) |
| Clamping Voltage | 602V max @ 0.66A (voltage seen by protected circuit during surge) |
| Peak Forward Surge Current | 40A @ 8.3ms half-sine (supports AC line surge testing) |
| Operating Temperature | –55°C to +150°C (suitable for under-hood automotive and industrial environments) |
| Package | SMA (surface-mount, 2-pin, JEDEC DO-214AC outline) |
Pinout & Package
PSMAJ440A-13 is housed in an SMA (DO-214AC) plastic package with cathode band polarity marking. The device has two terminals: anode and cathode - mounted with cathode band aligned to PCB silkscreen indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference plane during clamping event |
| Cathode | Protected line connection | Connected to input rail or signal line requiring overvoltage protection |
Key Features
| Feature | Design Value |
|---|---|
| Lead-free, RoHS-compliant plating | Matte tin finish, solderable per MIL-STD-202 Method 208 |
| Halogen- and antimony-free "Green" construction | <900ppm Br, <900ppm Cl, <1000ppm Sb compounds |
| UL 94V-0 flammability rating | Molded plastic case meets industrial safety standards for enclosure integration |
| Moisture sensitivity level 1 | No dry-pack or baking required prior to reflow soldering |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protects 24V DC input stage of programmable logic controllers against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp transients within safe margin of downstream DC-DC converter input rating. Use Value: 602V clamping voltage provides ≥15% margin below 700V-rated input capacitors and MOSFETs. | Use Scenario: Shields LIN bus transceiver power pins from battery voltage spikes during alternator regulation faults. IC Role / Device Role / Timing Role: Standoff voltage (376V) exceeds 12V system's worst-case load dump (up to 35V), enabling reliable suppression without leakage-induced sleep current increase. Use Value: 5.0µA max reverse leakage at VRWM ensures <100nA additional quiescent drain on always-on LIN nodes. |
| Telecom Remote Radio Unit | Smart Meter Power Input |
Use Scenario: Guards PoE-powered RF front-end modules against induced surges from nearby lightning strikes on outdoor cabling. IC Role / Device Role / Timing Role: Mounted at Ethernet port entry point, shunting energy into ground plane before reaching PHY IC and DC-DC controller. Use Value: 400W peak pulse rating sustains multiple 10/1000µs surges per IEC 61000-4-5 Level 4 compliance testing. | Use Scenario: Secures AC/DC adapter output against grid switching transients and neutral-ground potential shifts in utility meter installations. IC Role / Device Role / Timing Role: Placed after rectifier but before bulk capacitor to limit voltage overshoot during capacitor charging transients. Use Value: 1.0W steady-state dissipation allows continuous operation at 85°C ambient without thermal shutdown in sealed meter housings. |
Availability
PSMAJ440A-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom remote radio units, and smart meter power inputs requiring stable component supply across multi-year production cycles.
Supply support for PSMAJ440A-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 suppressor product line, engineered specifically for high-energy surge suppression in harsh-environment applications where reliability, thermal stability, and regulatory compliance are critical.
FAQ
What is the polarity configuration of PSMAJ440A-13?
PSMAJ440A-13 is a unidirectional TVS diode with cathode-anode polarity. The cathode is marked by a visible band on the SMA package body and must be connected toward the protected line; the anode connects to ground or reference. This configuration blocks reverse current up to 376V and clamps positive transients only.
How does PSMAJ440A-13 compare to bidirectional TVS devices?
Unlike bidirectional TVS diodes, PSMAJ440A-13 offers lower leakage (5.0µA max at VRWM) and higher breakdown voltage tolerance for DC-biased lines. It is unsuitable for AC signal lines or differential buses where negative-going transients occur - use bidirectional variants like SMBJ440A for those cases.
Can PSMAJ440A-13 be used in parallel for higher surge handling?
No - PSMAJ440A-13 should not be paralleled due to mismatched breakdown voltages causing current imbalance and premature failure. For higher power, select a single higher-rated device such as PSMBJ440A (600W) or use external current-sharing resistors with careful layout.
What is the recommended PCB pad layout for PSMAJ440A-13?
Follow Diodes' AP02001 suggested pad layout: 2.50mm × 6.50mm rectangular pads with 1.70mm spacing and 1.50mm solder mask opening. Minimize trace inductance by placing the device adjacent to the protected connector and routing ground return directly to a solid ground plane beneath the cathode pad.
PSMAJ440A-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):
- 376V
- Voltage - Breakdown (Min):
- 418V
- Voltage - Clamping (Max) @ Ipp:
- 602V
- Current - Peak Pulse (10/1000µs):
- 660mA
- 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
PSMAJ440A-13 FAQ
1.How can I place an order for PSMAJ440A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for PSMAJ440A-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 PSMAJ440A-13 reliable?
The price and inventory of PSMAJ440A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PSMAJ440A-13 is usually 5 days.
3.What payment methods are accepted for PSMAJ440A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PSMAJ440A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PSMAJ440A-13?
PSMAJ440A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PSMAJ440A-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 PSMAJ440A-13?
For technical support, including PSMAJ440A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PSMAJ440A-13 requirements.
6.How does Aetrix verify that PSMAJ440A-13 is sourced from the original manufacturer or authorized distributors?
All PSMAJ440A-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 PSMAJ440A-13 meets industry standards.
7.What is the process for return or replacement of PSMAJ440A-13?
All PSMAJ440A-13 units undergo pre-shipment inspection (PSI). If there is an issue with PSMAJ440A-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 PSMAJ440A-13 part is unused and in its original packaging.
Return procedure for PSMAJ440A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PSMAJ440A-13 Tags
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