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Vishay General Semiconductor - Diodes Division P4SMA18AHM3/H
- Part No.:
- P4SMA18AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA18AHM3/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,282
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Product details
Overview
P4SMA18AHM3/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 stand-off 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 (IPPM), and 400 W peak pulse power (10/1000 µs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the P4SMA18AHM3/H datasheet, P4SMA18AHM3/H pinout, P4SMA18AHM3/H application, or P4SMA18AHM3/H equivalent, key selection criteria include clamping performance under 10/1000 µs surge, unidirectional polarity with cathode band marking, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and thermal resistance (RθJA = 120 °C/W) for PCB layout validation.
Technical Context
The P4SMA18AHM3/H operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold (VBR = 17.1–18.9 V), then clamping to ≤25.2 V at 15.9 A. Its glass-passivated junction ensures stable breakdown and low leakage (<1 µA at 15.3 V).
It delivers 400 W peak pulse power per 10/1000 µs waveform with 0.01% duty cycle, derated above 25 °C per Fig. 2, and supports 40 A non-repetitive forward surge (8.3 ms half-sine). The device meets MSL Level 1 (260 °C reflow) and is qualified to AEC-Q101 for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 15.3 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 17.1–18.9 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 25.2 V at IPPM = 15.9 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines safe stress level for downstream ICs. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 µs) - Surge energy handling capability; validates robustness against IEC 61000-4-5 line surges. |
| ID (Reverse Leakage) | <1 µA at VWM - Minimal standby power loss and signal integrity impact in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature; sets thermal design limits for PCB copper pad sizing and ambient derating. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; used to calculate temperature rise under DC power dissipation (PD = 3.3 W). |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode identified by a band at one end; anode is unmarked.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when reverse voltage exceeds VBR. |
| Anode (unmarked end) | Reference node | Typically tied to system ground or lower-potential rail; completes current path during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; supports under-hood and ADAS applications. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern industrial and consumer electronics without compromising surge performance. |
| 400 W peak pulse power (10/1000 µs) | Provides robust protection against common lightning-induced and inductive-switching transients per IEC 61000-4-5 Level 3. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response), improving protection fidelity for sensitive logic inputs. |
| MSL Level 1 (260 °C peak) | Enables standard SMT reflow assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Sensor Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground to clamp transients before they reach the transceiver's input pins. Use Value: Limits voltage to ≤25.2 V during 15.9 A surge, preventing latch-up or gate oxide damage in AEC-Q100 qualified ICs. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Standoff-rated TVS on each input channel, absorbing repetitive 400 W pulses without degradation over 10⁵ cycles. Use Value: Maintains <1 µA leakage at 15.3 V, ensuring clean logic thresholds while surviving 40 A surge events per IEC 61000-4-4. |
| Consumer Power Adapter Output | Telecom Ethernet Port Protection |
Use Scenario: Secondary-side overvoltage suppression on 12–19 V DC outputs of wall adapters and USB-C PD power supplies. IC Role / Device Role / Timing Role: Unidirectional clamping device between output rail and ground, triggered only during fault conditions. Use Value: Clamps to 25.2 V within nanoseconds, protecting downstream DC-DC converters and USB port controllers from overvoltage stress. |
Use Scenario: Common-mode transient suppression on RJ45 Ethernet PHY lines exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Discrete TVS pair (one per differential pair) referenced to local ground plane, leveraging low capacitance and fast response. Use Value: Delivers 400 W pulse handling with minimal signal distortion due to low junction capacitance (typ. <100 pF at VWM). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same VWM (15.4 V), VC = 27.7 V at 14.4 A, 400 W rating, but not AEC-Q101 qualified; RθJA = 110 °C/W. | Commercial-grade only; unsuitable for automotive environments requiring AEC-Q101 validation. | Select SMAJ18A only for cost-sensitive industrial or consumer designs where automotive qualification is unnecessary. |
| 1.5SMC18A | Higher package (DO-214AB), larger footprint (7.11 × 6.22 mm vs. SMA's 4.93 × 3.99 mm), same VWM/VC specs, AEC-Q101 available in HM3 variant. | Requires PCB redesign due to larger pad layout; better thermal performance (RθJA = 80 °C/W) for high-duty-cycle applications. | Choose 1.5SMC18A when higher thermal mass or >400 W derated pulse handling is required, accepting larger board area. |
Compared with SMAJ18A and 1.5SMC18A, the P4SMA18AHM3/H uniquely combines AEC-Q101 qualification, halogen-free compliance, and compact SMA footprint-enabling drop-in replacement in space-constrained automotive modules without sacrificing surge robustness or thermal margin.
Availability
P4SMA18AHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC inputs, consumer power adapter outputs, and telecom Ethernet port protection requiring stable component supply across production lifecycles.
Supply support for P4SMA18AHM3/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 cost-effective, high-volume transient suppression in automotive, industrial, and consumer systems, balancing compact packaging, AEC-Q101 compliance, and standardized 10/1000 µs surge performance.
FAQ
What is the clamping voltage of the P4SMA18AHM3/H under a 10/1000 µs surge?
The P4SMA18AHM3/H clamps to a maximum of 25.2 V when subjected to its rated peak pulse current of 15.9 A under a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 5.0 mm × 5.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during transient events. The P4SMA18AHM3/H maintains this clamping performance consistently across its operational temperature range.
Is the P4SMA18AHM3/H suitable for automotive applications?
Yes, the P4SMA18AHM3/H is AEC-Q101 qualified (indicated by the HM3 suffix) and specifically validated for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. It meets stringent requirements for temperature cycling, humidity testing, and surge endurance. The P4SMA18AHM3/H also complies with halogen-free and RoHS directives required by Tier 1 automotive suppliers.
How does the P4SMA18AHM3/H differ from the P4SMA18A-E3/61?
The P4SMA18AHM3/H differs from P4SMA18A-E3/61 in three key aspects: it carries the HM3 suffix indicating halogen-free and AEC-Q101 qualification (vs. E3's commercial-grade RoHS compliance), uses a 7-inch tape-and-reel delivery mode (H suffix), and is optimized for automotive reliability testing. The P4SMA18AHM3/H retains identical electrical specs (VWM = 15.3 V, VC = 25.2 V) but adds qualification rigor absent in the E3 variant.
What is the maximum operating temperature for the P4SMA18AHM3/H?
The P4SMA18AHM3/H has a maximum junction temperature (TJ max) of +150 °C and an operating junction/storage temperature range of –65 °C to +150 °C. Its thermal resistance (RθJA = 120 °C/W) allows direct calculation of junction temperature rise under DC bias; for example, at 3.3 W dissipation, ΔTJ = 396 °C - underscoring the need for proper PCB copper thermal relief and derating above 25 °C ambient. The P4SMA18AHM3/H must be applied within these thermal limits to ensure long-term reliability.
Does the P4SMA18AHM3/H have polarity markings, and how is it installed?
Yes, the P4SMA18AHM3/H is unidirectional and marked with a cathode band at one end of the SMA (DO-214AC) package. During installation, the banded end connects to the line being protected (e.g., 12 V rail or signal trace), while the unmarked anode end connects to ground. Reversing polarity prevents clamping action and may cause catastrophic failure under overvoltage. The P4SMA18AHM3/H's cathode band is clearly visible and aligns with JEDEC DO-214AC mechanical standards.
P4SMA18AHM3/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:
- 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:
- 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)
P4SMA18AHM3/H FAQ
1.How can I place an order for P4SMA18AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA18AHM3/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 P4SMA18AHM3/H reliable?
The price and inventory of P4SMA18AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA18AHM3/H is usually 5 days.
3.What payment methods are accepted for P4SMA18AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA18AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA18AHM3/H?
P4SMA18AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA18AHM3/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 P4SMA18AHM3/H?
For technical support, including P4SMA18AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA18AHM3/H requirements.
6.How does Aetrix verify that P4SMA18AHM3/H is sourced from the original manufacturer or authorized distributors?
All P4SMA18AHM3/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 P4SMA18AHM3/H meets industry standards.
7.What is the process for return or replacement of P4SMA18AHM3/H?
All P4SMA18AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA18AHM3/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 P4SMA18AHM3/H part is unused and in its original packaging.
Return procedure for P4SMA18AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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