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Vishay General Semiconductor - Diodes Division P4SMA18AHE3/61
- Part No.:
- P4SMA18AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA18AHE3/61.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA18AHE3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for circuit-level ESD and surge protection in power rails and signal lines. It features a 18 V breakdown voltage (VBR = 17.1–18.9 V at 1 mA), 15.3 V stand-off voltage (VWM), clamps transients to ≤25.2 V at 15.9 A peak pulse current, and delivers 400 W peak pulse power with a 10/1000 µs waveform - used in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the P4SMA18AHE3/61 datasheet, P4SMA18AHE3/61 pinout, P4SMA18AHE3/61 application, or P4SMA18AHE3/61 equivalent, key selection criteria include its AEC-Q101 qualification, SMA (DO-214AC) package compatibility, unidirectional polarity with cathode band marking, and thermal resistance (RθJA = 120 °C/W) for board-level thermal design.
Technical Context
The P4SMA18AHE3/61 operates as a silicon avalanche diode with glass-passivated junction, enabling fast response (<1 ns) to transient overvoltages and low incremental surge resistance. Its clamping behavior is defined by the 10/1000 µs waveform standard per REA, with derating above 25 °C per Fig. 2 and validated on 5.0 mm × 5.0 mm copper pads.
It supports unidirectional protection only, with cathode-band polarity identification, and meets MSL Level 1 per J-STD-020 (peak reflow 260 °C). The device is RoHS-compliant and AEC-Q101 qualified under automotive ordering code HE3, confirming suitability for automotive-grade reliability testing including temperature cycling and HTRB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - defines precise avalanche initiation threshold for predictable clamping onset |
| VWM | 15.3 V - maximum continuous reverse working voltage before leakage exceeds 1 µA |
| VC @ IPPM | 25.2 V at 15.9 A - clamped voltage during 400 W transient, limiting downstream IC stress |
| PPPM | 400 W (10/1000 µs) - peak surge handling capacity for lightning/inductive-switching events |
| IFSM | 40 A (8.3 ms half-sine) - surge current rating for short-duration power rail faults |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 120 °C/W - thermal resistance from junction to ambient, guiding PCB copper area requirements |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected line ground or low-side reference | Defines unidirectional conduction path - must be tied to lower potential side of protected node |
| Cathode | Current exit terminal in forward bias; marked with band, connected to power rail or signal source | Clamping occurs when cathode-to-anode voltage exceeds VBR; polarity-critical for correct protection orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including temperature cycling, HTRB, and mechanical shock per AEC standard |
| Glass passivated junction | Ensures stable breakdown voltage and low leakage over lifetime, even under humidity and thermal stress |
| MSL Level 1 rating | Allows direct placement on PCB without baking; compatible with standard SMT reflow profiles up to 260 °C peak |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V systems with margin |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage exposure to downstream MOSFETs or microcontrollers during transient events |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor signal line and chassis ground to clamp transients before they reach the ADC input or transceiver ESD structure. Use Value: Limits voltage to ≤25.2 V during 15.9 A surges, preventing latch-up or gate oxide damage in 3.3 V/5 V interface ICs while maintaining signal integrity. |
Use Scenario: Safeguarding digital input modules against induced surges from relay coil switching and motor drive noise in factory automation cabinets. IC Role / Device Role / Timing Role: Mounted across 24 V DC input terminals to shunt fast-rising transients (<1 ns rise time) before reaching optocoupler or microcontroller GPIO. Use Value: Withstands 400 W pulses without degradation, enabling compliance with IEC 61000-4-4 (electrical fast transients) and IEC 61000-4-5 (surge) immunity requirements. |
| Consumer Power Adapter Output | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side overvoltage suppression on 5 V/12 V USB-C PD adapter outputs exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Placed between VOUT and GND to clamp output overshoot during regulation loop instability or capacitive load switching. Use Value: Fast response and low VC ensure downstream USB controllers remain within absolute maximum ratings during 100 ns–1 µs transients. |
Use Scenario: Front-end protection of Ethernet PHYs and PoE injectors against lightning-induced surges on RJ45 ports in network switches and base stations. IC Role / Device Role / Timing Role: Used in conjunction with common-mode chokes and gas discharge tubes to absorb differential-mode energy on data pairs. Use Value: 15.3 V VWM allows safe operation across 12 V bias rails while clamping to 25.2 V - compatible with IEEE 802.3af/at PoE voltage margins. |
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 | Same SMA package, identical VBR (17.1–18.9 V), but rated for 400 W with 8.3 ms half-sine IFSM = 30 A (vs. 40 A for P4SMA18AHE3/61) | Lacks AEC-Q101 qualification; suitable for commercial/industrial use only | Select SMAJ18A where automotive qualification is not required and cost sensitivity outweighs reliability margin. |
| 1.5SMC18A | Higher-power SMC package (1500 W PPPM), same VBR range, but larger footprint (7.11 mm × 6.22 mm vs. SMA's 4.50 mm × 2.79 mm) | Used where higher surge energy absorption is needed, e.g., AC mains input stages or high-current power supplies | Choose 1.5SMC18A only when board space permits and surge energy exceeds 400 W capability - not a drop-in replacement. |
Compared with SMAJ18A and 1.5SMC18A, the P4SMA18AHE3/61 uniquely combines AEC-Q101 qualification, compact SMA footprint, and 40 A IFSM, making it optimal for space-constrained automotive and industrial control designs requiring certified reliability without layout redesign.
Availability
P4SMA18AHE3/61 is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O modules, and telecom line card protection requiring stable component supply, long-term lifecycle support, and traceable AEC-Q101 qualified parts.
Supply support for P4SMA18AHE3/61 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The P4SMA Series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for robust, low-profile transient suppression in automotive, industrial, and consumer power and signal lines - balancing clamping performance, thermal stability, and manufacturability.
FAQ
What is the breakdown voltage tolerance for P4SMA18AHE3/61?
The P4SMA18AHE3/61 has a specified breakdown voltage (VBR) range of 17.1 V to 18.9 V at 1 mA test current, representing ±5.6% tolerance around the nominal 18 V rating. This tight distribution ensures consistent clamping behavior across production lots and supports reliable system-level surge margin calculations in automotive and industrial designs.
Is P4SMA18AHE3/61 suitable for bidirectional transient protection?
No, P4SMA18AHE3/61 is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only when cathode voltage exceeds anode voltage by ≥VBR. For bidirectional protection, Vishay offers the P4SMA18CA variant - using the same SMA package but symmetric breakdown in both polarities.
Does P4SMA18AHE3/61 require derating at elevated ambient temperatures?
Yes, P4SMA18AHE3/61 must be derated above 25 °C ambient per Figure 2 in the datasheet. At 85 °C, its 400 W peak pulse power rating drops to approximately 280 W, and its 3.3 W steady-state power dissipation decreases linearly with junction temperature. Thermal design must account for RθJA = 120 °C/W and PCB copper area.
What does the "HE3/61" suffix indicate in P4SMA18AHE3/61?
The "HE3" suffix denotes RoHS-compliant construction with AEC-Q101 qualification; "61" specifies packaging in 7-inch plastic tape-and-reel format with 1800 units per reel. This ordering code confirms automotive-grade reliability, lead-free finish, and SMT-ready delivery - distinct from commercial-grade E3 or halogen-free HM3 variants.
How does P4SMA18AHE3/61 compare to older P4SMA18A-E3/61 in terms of performance?
P4SMA18AHE3/61 is the AEC-Q101 qualified version of P4SMA18A-E3/61, sharing identical electrical specs (VBR, VC, PPPM) and package, but adding automotive stress-test validation including HTOL, temperature cycling, and bond wire pull tests. No performance trade-offs exist - the HE3 variant simply extends reliability assurance to automotive applications.
P4SMA18AHE3/61 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:
- Discontinued at Digi-Key
- 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)
P4SMA18AHE3/61 FAQ
1.How can I place an order for P4SMA18AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA18AHE3/61 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 P4SMA18AHE3/61 reliable?
The price and inventory of P4SMA18AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA18AHE3/61 is usually 5 days.
3.What payment methods are accepted for P4SMA18AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA18AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA18AHE3/61?
P4SMA18AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA18AHE3/61 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 P4SMA18AHE3/61?
For technical support, including P4SMA18AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA18AHE3/61 requirements.
6.How does Aetrix verify that P4SMA18AHE3/61 is sourced from the original manufacturer or authorized distributors?
All P4SMA18AHE3/61 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 P4SMA18AHE3/61 meets industry standards.
7.What is the process for return or replacement of P4SMA18AHE3/61?
All P4SMA18AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA18AHE3/61, 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 P4SMA18AHE3/61 part is unused and in its original packaging.
Return procedure for P4SMA18AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA18AHE3/61 Tags
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