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Vishay General Semiconductor - Diodes Division P4SMA18AHE3_A/H
- Part No.:
- P4SMA18AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA18AHE3_A/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,671
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Product details
Overview
P4SMA18AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 15.3 V standoff voltage (VWM), 17.1–18.9 V breakdown voltage (VBR) at 1 mA, 25.2 V maximum clamping voltage (VC) at 15.9 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs and sensor interfaces in automotive ECUs.
For engineers reviewing the P4SMA18AHE3_A/H datasheet, P4SMA18AHE3_A/H pinout, P4SMA18AHE3_A/H application, or P4SMA18AHE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
The P4SMA18AHE3_A/H operates as a silicon avalanche diode that enters breakdown when reverse voltage exceeds its VBR range (17.1–18.9 V), limiting transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1 ns), critical for protecting sensitive IC inputs against ESD and inductive switching spikes.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, enabling reliable operation up to 150 °C junction temperature. The device is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine) and meets J-STD-020 MSL Level 1 with 260 °C reflow peak, supporting high-volume automotive PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR @ IT = 1 mA | 17.1–18.9 V - Breakdown threshold range; ensures consistent turn-on across production lots under standardized test conditions. |
| VC @ IPPM = 15.9 A | 25.2 V - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 400 W - Peak pulse power handling capability; validates robustness against IEC 61000-4-5 Level 4 surges (4 kV line-to-line). |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); supports protection of power rails subject to motor or relay coil turn-off events. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments without derating. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional TVS configuration. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail or sensor output); conducts surge current to anode during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control, body modules, and ADAS sensors requiring long-term field reliability. |
| Glass passivated junction | Ensures stable leakage current (<1 µA at VWM) and repeatable VBR performance across temperature and lifetime. |
| MSL Level 1 (260 °C) | Enables standard lead-free reflow without moisture sensitivity concerns - no baking required prior to assembly. |
| 400 W peak pulse power | Provides margin against ISO 7637-2 Pulse 1/2/5a transients and IEC 61000-4-5 combination wave surges in 12 V systems. |
| Low profile SMA package | 0.208" × 0.157" footprint fits dense automotive PCB layouts while maintaining thermal dissipation via 5.0 mm × 5.0 mm copper pads. |
Applications
| Automotive Power Rail Protection | Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply lines in engine control units (ECUs) from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and local regulator input. Use Value: Limits transient voltage to ≤25.2 V during 400 W surges, preventing damage to downstream LDOs and microcontrollers. |
Use Scenario: Safeguarding analog outputs of pressure or temperature sensors connected to vehicle CAN networks. IC Role / Device Role / Timing Role: Point-of-entry transient suppressor on sensor output trace, referenced to chassis ground. Use Value: Clamps ESD events (IEC 61000-4-2 ±15 kV contact) within <1 ns, preserving signal integrity and ADC accuracy. |
| Industrial Motor Drive Interface | Consumer Power Adapter Input Stage |
|
Use Scenario: Shielding gate driver ICs from inductive kickback when controlling brushed DC motors in HVAC actuators. IC Role / Device Role / Timing Role: Reverse-biased TVS across motor winding terminals or driver supply pins. Use Value: Absorbs 40 A surge currents (8.3 ms) without degradation, extending gate driver lifetime in cyclic duty applications. |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for smart home devices. IC Role / Device Role / Timing Role: Standoff-rated protector on 5 V/12 V output rails before USB or Ethernet interface ICs. Use Value: Maintains 15.3 V working voltage margin while clamping lightning-induced surges to 25.2 V, meeting UL 497B requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/5A | Same VWM (15.3 V), identical SMA package, but rated for 400 W with 8.3 ms surge only (not 10/1000 µs); higher VC = 27.7 V. | Limited to shorter-duration surges; less effective for IEC 61000-4-5 compliance testing. | Select P4SMA18AHE3_A/H when full 10/1000 µs waveform immunity and AEC-Q101 qualification are mandatory. |
| 1.5SMC18A | Higher package thermal resistance (RθJA ≈ 150 °C/W vs. 120 °C/W); same VBR and VC, but SMC (DO-214AB) package is larger and not AEC-Q101 qualified. | Requires more PCB area; unsuitable for space-constrained automotive modules. | Choose P4SMA18AHE3_A/H for compact, automotive-grade designs where board space and qualification are critical. |
Compared with SMAJ18A-E3/5A and 1.5SMC18A, P4SMA18AHE3_A/H delivers superior thermal performance, verified AEC-Q101 compliance, and tighter clamping (25.2 V vs. 27.7 V), making it the preferred choice for next-generation automotive and industrial transient protection where reliability and footprint efficiency are prioritized.
Availability
P4SMA18AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial motor drives, sensor interface modules, and consumer power adapter designs requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for P4SMA18AHE3_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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade validation.
The P4SMA Series is engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where high-energy surge immunity and long-term stability are essential design requirements.
FAQ
What is the polarity configuration of P4SMA18AHE3_A/H?
The P4SMA18AHE3_A/H is a unidirectional transient voltage suppressor diode. Its cathode is marked by a band on the SMA (DO-214AC) package body, and it conducts surge current from cathode to anode during reverse overvoltage events. This configuration ensures precise clamping on positive-going transients relative to ground, making it ideal for 12 V automotive supply rail protection where polarity is fixed.
Does P4SMA18AHE3_A/H meet automotive qualification standards?
Yes, P4SMA18AHE3_A/H is AEC-Q101 qualified, confirming its suitability for automotive applications. The "HE3" suffix denotes RoHS-compliant construction with AEC-Q101 validation, covering tests such as temperature cycling, high-temperature reverse bias (HTRB), and ESD robustness. This qualification supports deployment in engine control, body electronics, and ADAS subsystems without additional reliability screening.
What is the maximum clamping voltage of P4SMA18AHE3_A/H under surge conditions?
The P4SMA18AHE3_A/H has a maximum clamping voltage (VC) of 25.2 V at 15.9 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value represents the upper limit of voltage seen by protected circuitry during worst-case surge events and is critical for ensuring downstream components like microcontrollers or gate drivers remain within their absolute maximum ratings.
Can P4SMA18AHE3_A/H be used in bidirectional protection circuits?
No, P4SMA18AHE3_A/H is strictly unidirectional. For bidirectional transient suppression, Vishay offers the P4SMA18CA variant (with "CA" suffix). Using P4SMA18AHE3_A/H in a bidirectional configuration would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit - always match polarity type to system architecture.
What is the thermal resistance of P4SMA18AHE3_A/H, and how does it affect layout?
P4SMA18AHE3_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. To maintain safe junction temperatures under repetitive surge conditions, PCB layout must replicate this pad size and ensure adequate copper pour area - reducing RθJA improves power handling and longevity of the P4SMA18AHE3_A/H in thermally demanding applications.
P4SMA18AHE3_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):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 15.9A
- 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)
P4SMA18AHE3_A/H FAQ
1.How can I place an order for P4SMA18AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA18AHE3_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 P4SMA18AHE3_A/H reliable?
The price and inventory of P4SMA18AHE3_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 P4SMA18AHE3_A/H is usually 5 days.
3.What payment methods are accepted for P4SMA18AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA18AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA18AHE3_A/H?
P4SMA18AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA18AHE3_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 P4SMA18AHE3_A/H?
For technical support, including P4SMA18AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA18AHE3_A/H requirements.
6.How does Aetrix verify that P4SMA18AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All P4SMA18AHE3_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 P4SMA18AHE3_A/H meets industry standards.
7.What is the process for return or replacement of P4SMA18AHE3_A/H?
All P4SMA18AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA18AHE3_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 P4SMA18AHE3_A/H part is unused and in its original packaging.
Return procedure for P4SMA18AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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