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Vishay General Semiconductor - Diodes Division P4SMA440AHM3_B/H
- Part No.:
- P4SMA440AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA440AHM3_B/H.pdf
- Description:
- TVS DIODE 376VWM 602VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA440AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 440 V standoff voltage (VWM), 462 V maximum breakdown voltage (VBR), and 602 V clamping voltage (VC) at 0.5 A peak pulse current (IPPM), designed to protect power rails and signal lines in automotive and industrial systems against ESD and lightning-induced transients.
For engineers reviewing the P4SMA440AHM3_B/H datasheet, P4SMA440AHM3_B/H pinout, P4SMA440AHM3_B/H application, or P4SMA440AHM3_B/H equivalent, this device delivers AEC-Q101 qualification, 400 W peak pulse power (10/1000 µs), low thermal resistance (RθJL = 30 °C/W), and halogen-free RoHS compliance - critical for high-reliability automotive electronics design and long-lifecycle industrial deployments.
Technical Context
The P4SMA440AHM3_B/H operates as a unidirectional clamping device with cathode-band polarity marking, leveraging glass-passivated junction technology for stable avalanche behavior under repetitive surge conditions. Its 440 V VWM enables use on 380–400 VAC-derived DC bus lines and telecom power supplies where overvoltage margins exceed 15 %.
Thermal performance is defined by RθJA = 120 °C/W (free-air) and RθJL = 30 °C/W, supporting operation up to TJ = 150 °C when mounted on 5.0 mm × 5.0 mm copper pads. The device meets MSL Level 1 per J-STD-020 and withstands 40 A IFSM (8.3 ms half-sine) without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 440 V - Maximum continuous reverse working voltage before clamping begins; sets operating margin above 380 VAC rectified DC rails. |
| VBR (Breakdown Voltage) | 418–462 V at IT = 1 mA - Confirmed avalanche onset range ensures predictable turn-on during fast transients. |
| VC (Clamping Voltage) | 602 V at IPPM = 0.5 A (10/1000 µs) - Limits downstream voltage stress to safe levels for 600 V-rated MOSFETs and gate drivers. |
| PPPM (Peak Pulse Power) | 400 W - Sustains standardized lightning surge energy (IEC 61000-4-5) without failure when properly heatsinked. |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Negligible standby power loss in high-impedance monitoring circuits and battery-backed systems. |
| TJ max. | 150 °C - Enables deployment in under-hood automotive environments and enclosed industrial enclosures without derating. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. Cathode identified by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected circuit ground or low-side return path; must be routed with low-inductance trace for effective clamping. |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to line being protected (e.g., DC bus); band-marked end defines polarity for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) on 400 VDC systems without degradation. |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and IPC-1752A material declarations for green manufacturing. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT assembly processes without pre-baking or special handling. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during sub-microsecond ESD events (<15 ns rise time). |
Applications
| Automotive Power Supply Protection | Industrial AC/DC Converter Output |
|---|---|
Use Scenario: Protecting 400 VDC output of on-board charger (OBC) DC-link capacitor from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus to clamp positive-going spikes exceeding 440 V. Use Value: Prevents overvoltage failure of 600 V SiC MOSFETs and maintains system uptime during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding output stage of 3-phase industrial rectifier feeding PLC I/O modules. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive switching transients from contactor bounce and motor regeneration. Use Value: Extends electrolytic capacitor life by limiting voltage excursions beyond 450 V rating during 100 ms surges. |
| Telecom Rectifier Module | Renewable Energy Inverter DC Link |
Use Scenario: Clamping induced surges on -48 VDC telecom power distribution boards exposed to lightning coupling. IC Role / Device Role / Timing Role: High-VWM TVS deployed at board edge to shunt common-mode transients before entering DC-DC converters. Use Value: Maintains <1 µA leakage at nominal -48 V, avoiding false fault detection in remote monitoring circuits. |
Use Scenario: Protecting DC link capacitors in solar string inverters subjected to grid-switching transients. IC Role / Device Role / Timing Role: Unidirectional suppressor placed between PV array input and inverter bridge to limit voltage overshoot during rapid irradiance changes. Use Value: Enables use of cost-optimized 630 V film capacitors instead of 700 V-rated units due to guaranteed 602 V VC ceiling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ440A | Same VWM/VBR/VC ratings but rated for 400 W only at TA ≤ 25 °C; RθJA = 140 °C/W vs. 120 °C/W for P4SMA440AHM3_B/H. | Lacks AEC-Q101 qualification and halogen-free certification; limited to commercial-grade industrial use. | Select SMAJ440A only for non-automotive, cost-sensitive designs where thermal margin exceeds 20 °C. |
| SMCJ440A | Higher PPPM (1500 W), larger DO-214AB package, 1.5× footprint; same VWM/VBR but VC = 648 V at 2.3 A. | Requires PCB redesign; suited for higher-energy threats (e.g., IEC 61000-4-5 6 kV) where P4SMA440AHM3_B/H may not survive repeated strikes. | Choose SMCJ440A when surge duty cycle exceeds 0.01 % or when clamping voltage margin allows 648 V. |
Compared with SMAJ440A, P4SMA440AHM3_B/H offers superior thermal performance and automotive qualification; versus SMCJ440A, it provides space-constrained placement with verified 400 W capability - making it optimal for AEC-Q101-compliant 400 VDC systems where board area and reliability are prioritized over extreme surge headroom.
Availability
P4SMA440AHM3_B/H is available at Aetrix Electronics and suitable for automotive power modules, industrial AC/DC converters, telecom rectifier systems, and renewable energy inverters requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P4SMA440AHM3_B/H 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA Series targets high-voltage transient suppression in automotive, industrial, and telecom infrastructure, engineered for robustness under repetitive surge stress and compatibility with automated SMT assembly.
FAQ
What is the clamping voltage of the P4SMA440AHM3_B/H at its rated peak pulse current?
The P4SMA440AHM3_B/H has a maximum clamping voltage (VC) of 602 V at 0.5 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88367 and ensures predictable overvoltage limiting for downstream 600 V-rated components. The P4SMA440AHM3_B/H maintains this clamping performance across its qualified temperature range (-65 °C to +150 °C) when mounted per recommended pad layout.
Is the P4SMA440AHM3_B/H suitable for automotive applications?
Yes, the P4SMA440AHM3_B/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's P4SMA series datasheet (Rev. 09-Jan-2024). It undergoes stress testing for temperature cycling, high-temperature reverse bias, and ESD per AEC-Q101 requirements. The P4SMA440AHM3_B/H is specifically intended for under-hood and powertrain applications where 440 V standoff and 150 °C operation are required.
What does the "HM3" suffix indicate in P4SMA440AHM3_B/H?
The "HM3" suffix in P4SMA440AHM3_B/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table, HM3 devices meet JESD 201 Class 2 whisker resistance and UL 94 V-0 flammability standards. The "B" revision code indicates this variant is part of the 250–540 V range qualified for automotive use, and "H" specifies 7-inch tape-and-reel packaging (1800 units per reel).
How does the thermal resistance of the P4SMA440AHM3_B/H affect PCB layout?
The P4SMA440AHM3_B/H has RθJL = 30 °C/W and RθJA = 120 °C/W, meaning effective heat dissipation requires direct thermal connection from cathode/anode pads to ≥5.0 mm × 5.0 mm copper areas per terminal. To maintain TJ ≤ 150 °C during repetitive 400 W pulses, the P4SMA440AHM3_B/H demands minimum pad dimensions matching Vishay's recommended layout - undersized traces increase junction temperature and risk parametric shift or failure.
Can the P4SMA440AHM3_B/H replace a bidirectional TVS in a circuit?
No, the P4SMA440AHM3_B/H is unidirectional only, as indicated by its "A" suffix and absence of "CA" designation. It conducts in forward bias and clamps only reverse transients - using it in place of a bidirectional device (e.g., P4SMA440CA) would leave the circuit unprotected against negative-going surges. The P4SMA440AHM3_B/H must be oriented with cathode toward the protected line and anode to ground, and cannot substitute for symmetrical clamping applications.
P4SMA440AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA, TransZorb®
- 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):
- 500mA
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA440AHM3_B/H FAQ
1.How can I place an order for P4SMA440AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA440AHM3_B/H 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 P4SMA440AHM3_B/H reliable?
The price and inventory of P4SMA440AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA440AHM3_B/H is usually 5 days.
3.What payment methods are accepted for P4SMA440AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA440AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA440AHM3_B/H?
P4SMA440AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA440AHM3_B/H 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 P4SMA440AHM3_B/H?
For technical support, including P4SMA440AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA440AHM3_B/H requirements.
6.How does Aetrix verify that P4SMA440AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All P4SMA440AHM3_B/H 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 P4SMA440AHM3_B/H meets industry standards.
7.What is the process for return or replacement of P4SMA440AHM3_B/H?
All P4SMA440AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA440AHM3_B/H, 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 P4SMA440AHM3_B/H part is unused and in its original packaging.
Return procedure for P4SMA440AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA440AHM3_B/H Tags
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