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Vishay General Semiconductor - Diodes Division P4SMA440AHM3_B/I
- Part No.:
- P4SMA440AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA440AHM3_B/I.pdf
- Description:
- TVS DIODE 376VWM 602VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA440AHM3_B/I 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). It delivers 400 W peak pulse power with 10/1000 µs waveform and is AEC-Q101 qualified for automotive-grade reliability in power rail protection.
For engineers reviewing the P4SMA440AHM3_B/I datasheet, P4SMA440AHM3_B/I pinout, P4SMA440AHM3_B/I application, or P4SMA440AHM3_B/I equivalent, key selection criteria include clamping performance under high-voltage transients, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, halogen-free RoHS compliance, and suitability for 400 V DC bus surge suppression in industrial motor drives and automotive ECUs.
Technical Context
This TVS diode operates as a unidirectional clamping device: reverse-biased during normal operation, it remains high-impedance until transient voltage exceeds VBR (418–462 V), then rapidly avalanches to limit voltage across protected circuitry. Its glass-passivated junction ensures stable breakdown and low leakage (<1 µA at VWM).
Designed for 10/1000 µs surge waveforms per IEC 61000-4-5, it sustains 400 W peak pulse power on standard 5.0 mm × 5.0 mm copper pads, with derating above 25 °C ambient per Fig. 2. The SMA package supports automated placement and meets MSL Level 1 (260 °C reflow peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 376 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC bus operating margin. |
| VBR (Breakdown Voltage) | 418–462 V at 1 mA - Confirmed avalanche initiation range; ensures predictable clamping onset above nominal system voltage. |
| VC (Clamping Voltage) | 602 V at IPPM = 0.5 A - Peak voltage seen by protected IC/MOSFET during surge; critical for downstream component voltage rating margin. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability under standardized 10/1000 µs transient; validates robustness against lightning-induced surges. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on minimal pad layout; determines required board copper area for thermal management. |
| Operating Temperature | −65 to +150 °C - Full automotive-grade junction temperature range; supports under-hood and industrial ambient conditions. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD; enables use in safety-critical modules. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, matte tin-plated leads. Cathode indicated by band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., 400 V DC bus); conducts surge current to ground during overvoltage event. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during avalanche conduction. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables protection of 400 V systems against IEC 61000-4-5 Level 3/4 surges without derating or parallel devices. |
| Glass passivated junction | Ensures stable VBR over lifetime and temperature; eliminates parameter drift in high-reliability industrial deployments. |
| AEC-Q101 qualification (HM3 suffix) | Validates reliability for automotive powertrain and chassis modules where field failure is unacceptable. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without preconditioning; eliminates moisture-related popcorning risk in SMT lines. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; simplifies environmental compliance reporting. |
Applications
| Industrial Motor Drives | Automotive Engine Control Units |
|---|---|
Use Scenario: Protection of 400 V DC link capacitors and IGBT gate drivers against switching transients and load dump events. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed across DC bus or between gate driver output and power switch. Use Value: Limits transient overshoot to ≤602 V, preventing IGBT avalanche failure and ensuring >100,000-cycle surge endurance. |
Use Scenario: Surge suppression on 12 V/42 V auxiliary power rails feeding microcontrollers and CAN transceivers in engine bays. IC Role / Device Role / Timing Role: Primary overvoltage clamp on battery input line upstream of DC-DC converters. Use Value: Withstands 100 V/100 ms load dump pulses per ISO 7637-2 while maintaining <1 µA leakage at 376 V standby. |
| Solar Inverter DC Inputs | Railway Signaling Power Supplies |
Use Scenario: Protection of photovoltaic string inputs exposed to lightning-induced surges in outdoor installations. IC Role / Device Role / Timing Role: First-stage TVS on MPPT input stage, coordinated with MOVs and gas discharge tubes. Use Value: Fast response (<1 ns) and low clamping ratio (VC/VBR ≈ 1.30) preserve MPPT controller integrity during 6 kV ring-wave transients. |
Use Scenario: Overvoltage hardening of 110 V DC signaling power supplies in trackside cabinets subject to traction return current spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS on secondary side of isolation transformer, guarding relay drivers and optocouplers. Use Value: 376 V VWM provides 20 % margin above nominal 300 V rail, enabling reliable operation during ±15 % supply variation and surge events. |
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 (376 V), VC = 610 V, RθJA = 135 °C/W, non-AEC-Q101, standard RoHS (E3 suffix) | Lacks automotive qualification and halogen-free certification; suitable for commercial industrial use only. | Select when AEC-Q101 and halogen-free requirements are not mandated; lower cost for non-automotive BOMs. |
| SMCJ440A | Same VWM (376 V), higher PPPM = 1500 W, larger SMC (DO-214AB) package, RθJA = 35 °C/W | Requires PCB real estate increase (~3× footprint) but enables higher surge duty cycles and better thermal performance. | Choose when system-level surge testing exceeds 400 W or sustained repetitive transients demand lower thermal resistance. |
Compared with SMAJ440A, P4SMA440AHM3_B/I adds AEC-Q101 validation and halogen-free compliance for automotive deployment; versus SMCJ440A, it trades surge capacity and thermal efficiency for compact SMA footprint-ideal where space-constrained PCBs prioritize form factor over extreme energy handling.
Availability
P4SMA440AHM3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive engine control units, solar inverter DC inputs, and railway signaling power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for P4SMA440AHM3_B/I 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-power, and automotive-qualified components.
The P4SMA Series targets surface-mount transient suppression in space-constrained, high-voltage applications-specifically engineered for robust clamping performance, automated assembly compatibility, and AEC-Q101 compliance in automotive and industrial power systems.
FAQ
What is the clamping voltage of the P4SMA440AHM3_B/I at its rated peak pulse current?
The P4SMA440AHM3_B/I has a maximum clamping voltage (VC) of 602 V at 0.5 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per Figure 1 in the Vishay datasheet 88367 and defines the upper voltage limit imposed on protected circuitry during surge events. The P4SMA440AHM3_B/I maintains this clamping performance across its full operating temperature range (−65 °C to +150 °C) when mounted on recommended 5.0 mm × 5.0 mm copper pads.
Is the P4SMA440AHM3_B/I suitable for automotive applications?
Yes, the P4SMA440AHM3_B/I 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 high-temperature operating life, temperature cycling, and electrostatic discharge per automotive standards. The P4SMA440AHM3_B/I is specifically intended for under-hood and chassis-mounted modules where 400 V transient suppression is required, such as in 48 V mild-hybrid power distribution units and battery management system front-ends.
What does the "HM3" suffix indicate in P4SMA440AHM3_B/I?
The "HM3" suffix in P4SMA440AHM3_B/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table, HM3 parts meet JESD 201 Class 2 whisker resistance, use matte tin-plated leads solderable per J-STD-002, and are packaged in 13-inch tape-and-reel (I) format with 7500 units per reel. The P4SMA440AHM3_B/I also carries revision code "B", indicating its position within the AEC-Q101-qualified subset covering 250 V to 540 V devices.
How does the thermal resistance of the P4SMA440AHM3_B/I affect PCB layout?
The P4SMA440AHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain TJ ≤ 150 °C under 400 W surge conditions, designers must ensure adequate copper pour area and avoid thermally isolating the SMA package. The P4SMA440AHM3_B/I benefits from internal thermal vias beneath pads and shared ground planes-reducing effective RθJA by up to 30 % in optimized layouts.
Can the P4SMA440AHM3_B/I be used in bidirectional configurations?
No, the P4SMA440AHM3_B/I is a unidirectional TVS diode, as indicated by its "A" suffix and absence of "CA" designation. Its cathode band marks the terminal that must be connected toward the protected line (e.g., 400 V DC bus), with the anode tied to ground. Bidirectional operation requires CA-suffixed variants like P4SMA440CA, which are not interchangeable with P4SMA440AHM3_B/I due to fundamental polarity and breakdown symmetry differences. Using P4SMA440AHM3_B/I in bidirectional circuits risks forward conduction and failure.
P4SMA440AHM3_B/I 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/I FAQ
1.How can I place an order for P4SMA440AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA440AHM3_B/I 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/I reliable?
The price and inventory of P4SMA440AHM3_B/I 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/I is usually 5 days.
3.What payment methods are accepted for P4SMA440AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA440AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA440AHM3_B/I?
P4SMA440AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA440AHM3_B/I 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/I?
For technical support, including P4SMA440AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA440AHM3_B/I requirements.
6.How does Aetrix verify that P4SMA440AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All P4SMA440AHM3_B/I 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/I meets industry standards.
7.What is the process for return or replacement of P4SMA440AHM3_B/I?
All P4SMA440AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA440AHM3_B/I, 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/I part is unused and in its original packaging.
Return procedure for P4SMA440AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA440AHM3_B/I Tags
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