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Vishay General Semiconductor - Diodes Division P4SMA20AHM3_A/H
- Part No.:
- P4SMA20AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA20AHM3_A/H.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,462
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Product details
Overview
P4SMA20AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 20 V standoff voltage (VWM), 21.0 V maximum breakdown voltage (VBR), and 400 W peak pulse power (10/1000 µs). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD in automotive and industrial power electronics.
For engineers reviewing the P4SMA20AHM3_A/H datasheet, P4SMA20AHM3_A/H pinout, P4SMA20AHM3_A/H application, or P4SMA20AHM3_A/H equivalent, this AEC-Q101 qualified, halogen-free, RoHS-compliant TVS offers verified clamping performance (VC = 27.7 V at IPPM), low leakage (<1.0 µA), and MSL Level 1 reflow compatibility - critical for high-reliability board-level surge protection design.
Technical Context
This unidirectional TVS operates by avalanche breakdown to clamp transient overvoltages above its 20 V working peak reverse voltage. Its 27.7 V clamping voltage at 14.4 A peak pulse current ensures robust protection of downstream 24 V rail components without overstressing logic inputs or gate drivers.
Designed for automated SMT assembly, it features glass-passivated junction, matte tin-plated leads compliant with J-STD-002, and thermal resistance RθJA = 120 °C/W. The device meets AEC-Q101 stress testing requirements and supports operation from −65 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 24 V systems. |
| VBR (min/max) | 19.0 V / 21.0 V at 1.0 mA - Confirmed breakdown threshold range ensures predictable turn-on during transients. |
| VC @ IPPM | 27.7 V at 14.4 A - Clamped voltage under 400 W 10/1000 µs surge; limits stress on protected ICs to safe levels. |
| IPPM | 14.4 A - Peak pulse current capability directly determines energy absorption capacity in real-world surge events. |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in always-on circuits. |
| TJ max | +150 °C - Enables reliable operation in under-hood automotive and industrial environments with high ambient temperatures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal layout per datasheet fig. 2. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band marking; compliant with UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; completes clamping loop during positive transients. |
| Cathode | Reverse-biased terminal / protected line connection | Connected to the line being protected (e.g., 24 V supply or sensor input); conducts when Vin exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control and ADAS modules. |
| 400 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) without degradation; enables single-device protection for 24 V CAN or LIN bus nodes. |
| Low clamping ratio (VC/VWM = 1.385) | Minimizes overvoltage overshoot during fast transients - critical for safeguarding 3.3 V or 5 V logic interfaces powered from protected rails. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and JESD201 Class 2 whisker resistance - supports green manufacturing and long-term supply chain compliance. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning - eliminates moisture sensitivity handling overhead in production. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply lines feeding body control modules (BCM) and lighting drivers from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input to clamp transients up to 400 W. Use Value: Prevents latch-up or permanent damage to buck converters and microcontrollers during ISO 16750-2 pulse 5a events. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: TVS connected across sensor output and ground to suppress ESD and inductive kickback from solenoid actuation. Use Value: Maintains sub-1 LSB measurement accuracy by limiting transient-induced offset shift and preventing ADC saturation. |
| Telecom DC Power Feeds | Consumer Appliance Motor Control |
|
Use Scenario: Safeguarding PoE-powered Ethernet switches and remote radio units against lightning-induced surges on 48 V DC feeds. IC Role / Device Role / Timing Role: Primary clamping device on input stage, coordinated with upstream GDT and downstream π-filter. Use Value: Limits let-through voltage to <30 V during 10/1000 µs surges, preserving integrity of PMICs and PHY transceivers. |
Use Scenario: Protecting gate drivers and MCU I/O pins in smart washing machine motor inverters exposed to brush-commutator noise. IC Role / Device Role / Timing Role: TVS placed at MCU GPIO header and half-bridge driver enable inputs to absorb repetitive 100 ns–1 µs spikes. Use Value: Eliminates firmware resets and MOSFET shoot-through caused by transient-induced logic glitches on control signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A-E3/52 (Vishay) | Higher 600 W PPPM rating; SMB package (larger footprint, lower RθJA = 85 °C/W); same VWM/VC specs. | Better suited for higher-energy surges where PCB space allows larger package; not drop-in due to different pad layout. | Select when system-level surge testing exceeds IEC 61000-4-5 Level 4 and thermal margin is constrained. |
| 1.5SMC20A (ON Semiconductor) | Same 400 W rating and SMA package; slightly higher VBR range (19.0–22.1 V); VC = 29.1 V at 13.7 A. | Marginally higher clamping voltage reduces protection margin for 24 V logic; identical mounting but different marking and reel packaging. | Consider only if dual-sourcing is required and clamping voltage tolerance permits 1.4 V higher VC. |
Compared with SMBJ20A-E3/52, P4SMA20AHM3_A/H offers smaller footprint and AEC-Q101 qualification but lower energy handling; versus 1.5SMC20A, it delivers tighter VBR tolerance and lower clamping voltage - making it preferable for precision 24 V rail protection in automotive modules.
Availability
P4SMA20AHM3_A/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom DC feeds, and consumer appliance motor control requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P4SMA20AHM3_A/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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, efficiency, and application-specific performance.
The P4SMA Series targets board-level transient protection in automotive, industrial, and telecom systems, delivering AEC-Q101 qualified, high-power-density TVS diodes in compact surface-mount packages.
FAQ
What is the clamping voltage of P4SMA20AHM3_A/H under a 10/1000 µs surge?
The P4SMA20AHM3_A/H has a maximum clamping voltage (VC) of 27.7 V at 14.4 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88367 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 24 V system components.
Is P4SMA20AHM3_A/H qualified for automotive applications?
Yes, P4SMA20AHM3_A/H is AEC-Q101 qualified, as confirmed by the HM3 suffix and documentation in Vishay's P4SMA series datasheet (Rev. 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, making P4SMA20AHM3_A/H suitable for under-hood and chassis-mounted automotive electronics.
What does the "HM3" suffix indicate in P4SMA20AHM3_A/H?
The "HM3" suffix in P4SMA20AHM3_A/H denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance, and AEC-Q101 qualification. It distinguishes this variant from commercial-grade E3/M3 versions and confirms compliance with automotive environmental and reliability standards - essential for Tier 1 supplier BOM acceptance.
Can P4SMA20AHM3_A/H be used in bidirectional configurations?
No, P4SMA20AHM3_A/H is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and absence of bidirectional VWM/VBR ranges in its electrical characteristics table. For bidirectional protection, Vishay specifies part numbers ending in "CA", such as P4SMA20CA; using P4SMA20AHM3_A/H in AC-coupled or symmetrical surge paths would result in forward conduction and failure.
What is the thermal resistance of P4SMA20AHM3_A/H, and how does it affect layout?
P4SMA20AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay document 88367. This requires adherence to the recommended pad layout to avoid thermal runaway during repetitive surge events - undersized pads increase junction temperature and degrade long-term reliability of P4SMA20AHM3_A/H.
P4SMA20AHM3_A/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):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 14.4A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA20AHM3_A/H FAQ
1.How can I place an order for P4SMA20AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA20AHM3_A/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 P4SMA20AHM3_A/H reliable?
The price and inventory of P4SMA20AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA20AHM3_A/H is usually 5 days.
3.What payment methods are accepted for P4SMA20AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA20AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA20AHM3_A/H?
P4SMA20AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA20AHM3_A/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 P4SMA20AHM3_A/H?
For technical support, including P4SMA20AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA20AHM3_A/H requirements.
6.How does Aetrix verify that P4SMA20AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All P4SMA20AHM3_A/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 P4SMA20AHM3_A/H meets industry standards.
7.What is the process for return or replacement of P4SMA20AHM3_A/H?
All P4SMA20AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA20AHM3_A/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 P4SMA20AHM3_A/H part is unused and in its original packaging.
Return procedure for P4SMA20AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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