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Vishay General Semiconductor - Diodes Division P4SMA18CAHE3_A/H
- Part No.:
- P4SMA18CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA18CAHE3_A/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,857
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Product details
Overview
P4SMA18CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in the P4SMA series, designed for clamping voltage transients on signal and power 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 capability with a 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the P4SMA18CAHE3_A/H datasheet, P4SMA18CAHE3_A/H pinout, P4SMA18CAHE3_A/H application, or P4SMA18CAHE3_A/H equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, AEC-Q101 qualification, and SMA (DO-214AC) package compatibility are required in space-constrained PCB layouts.
Technical Context
The P4SMA18CAHE3_A/H operates as a bidirectional avalanche diode, symmetrically clamping transient voltages above ±17.1 V and below ±15.3 V in both polarities. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM), while its MSL Level 1 rating supports lead-free reflow up to 260 °C.
It delivers 400 W peak pulse power (10/1000 µs) at TA = 25 °C, derating linearly above 25 °C per Fig. 2, with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W. The device is AEC-Q101 qualified (automotive-grade), RoHS-compliant, and halogen-free per Vishay's HM3/HE3 suffix designation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 15.3 V - Maximum continuous reverse voltage before clamping begins; defines safe operating window for protected circuitry. |
| VBR (Breakdown) | 17.1–18.9 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC (Clamping) | 25.2 V at 15.9 A - Maximum voltage seen by downstream components during 10/1000 µs surge; critical for IC survivability. |
| PPPM | 400 W - Peak transient energy absorption capacity under standard 10/1000 µs waveform; enables protection against IEC 61000-4-5 Level 3 surges. |
| IPPM | 15.9 A - Peak surge current supported at VC; determines minimum trace width and layout margin for high-current paths. |
| TJ max. | +150 °C - Maximum junction temperature; allows operation in under-hood automotive environments without derating. |
| AEC-Q101 | Qualified - Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
Pinout & Package
Package: SMA (DO-214AC) - Surface-mount, low-profile plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-002 solderability requirements. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node for bidirectional conduction path | Connected to line being protected; no polarity marking - symmetric operation requires no orientation check during placement. |
| Cathode | Current exit terminal in forward bias; identical electrical role to Anode in bidirectional mode | Electrically interchangeable with Anode; bidirectional symmetry eliminates cathode-band dependency in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN, RS-485, sensor bridges) without polarity constraints. |
| 400 W peak pulse power | Supports IEC 61000-4-5 surge immunity up to 1 kV open-circuit / 0.5 kV short-circuit (Level 3) with minimal board area. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity testing, and mechanical shock - suitable for Tier-1 production. |
| MSL Level 1, 260 °C peak | Compatible with standard lead-free reflow profiles without pre-baking; reduces manufacturing complexity and cost. |
| Glass-passivated junction | Ensures stable VBR tolerance (±5 %) and low leakage (<1 µA) over 10-year field life in harsh environments. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS placed between sensor output and microcontroller ADC input to clamp transients before signal conditioning stage. Use Value: Limits voltage excursion to ≤25.2 V during 10/1000 µs surges, preventing ADC saturation and protecting 3.3 V or 5 V input stages. |
Use Scenario: Shielding digital input terminals of programmable logic controllers from induced surges on 24 V DC field wiring in factory automation. IC Role / Device Role / Timing Role: Standoff-clamp device installed across input terminals to shunt surge energy away from optocoupler input circuitry. Use Value: Withstands repetitive 400 W pulses without degradation, maintaining <1 µA leakage at 15.3 V to avoid false triggering in high-impedance inputs. |
| Consumer USB Interface Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Safeguarding USB 2.0 D+/D− lines in portable medical devices against ESD events per IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed directly at connector to suppress fast-rising ESD transients before USB transceiver. Use Value: Clamps sub-100 ns ESD spikes within 1 ns response time while adding <10 pF capacitance - preserving signal integrity up to 480 Mbps. |
Use Scenario: Protecting Ethernet PHY interface pins on telecom line cards from lightning-induced surges on PoE-enabled RJ45 ports. IC Role / Device Role / Timing Role: Primary clamping device mounted at port entry point, coordinated with GDT secondary protection for staged energy handling. Use Value: Absorbs first 400 W of surge energy with 25.2 V clamping, reducing stress on downstream silicon and enabling compact, multi-port designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Same VWM/VBR/VC, but SMB package (DO-214AA); 600 W PPPM, higher thermal mass | Preferred where higher surge margin or legacy SMB footprint exists; less space-efficient than SMA | Select when board layout allows larger footprint and higher single-pulse robustness is prioritized over density. |
| 1.5KE18CA | Through-hole TO-204AE (DO-201AE); 1500 W PPPM, slower response due to higher parasitic inductance | Suitable for non-high-speed power rail protection only; not recommended for signal-line or high-frequency applications | Choose only for cost-sensitive, non-automotive, non-surface-mount designs requiring highest single-event energy handling. |
Compared with SMBJ18CA and 1.5KE18CA, the P4SMA18CAHE3_A/H offers optimal balance of AEC-Q101 qualification, SMA footprint density, and 400 W surge capability - making it the preferred choice for automotive and industrial SMT designs where reliability, size, and process compatibility are jointly critical.
Availability
P4SMA18CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and consumer USB protection requiring stable component supply, AEC-Q101 compliance, and consistent DO-214AC packaging.
Supply support for P4SMA18CAHE3_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 power MOSFETs with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The P4SMA series is engineered for high-reliability transient suppression in automotive, industrial, and computing applications - delivering standardized surge performance, AEC-Q101 validation, and optimized surface-mount form factors for automated assembly.
FAQ
What does the "CA" suffix indicate in P4SMA18CAHE3_A/H?
The "CA" suffix in P4SMA18CAHE3_A/H denotes a bidirectional configuration - meaning the device provides symmetrical transient voltage clamping in both polarities. This eliminates polarity concerns during PCB placement and enables protection of AC-coupled or floating signal lines such as those found in CAN bus, RS-485, or bridge sensor outputs. Unlike unidirectional variants (e.g., P4SMA18A), the P4SMA18CAHE3_A/H has no cathode band marking and functions identically regardless of voltage polarity applied across its terminals.
Is P4SMA18CAHE3_A/H qualified for automotive applications?
Yes, P4SMA18CAHE3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure ("HE3" suffix) and documentation (Document Number 88367, Revision 09-Jan-2024). This qualification covers stress tests including temperature cycling, humidity bias, mechanical shock, and high-temperature operating life - validating its suitability for under-hood, body control, and ADAS sensor applications. The device is rated for continuous operation from –65 °C to +150 °C junction temperature.
What is the maximum clamping voltage of P4SMA18CAHE3_A/H and why does it matter?
The maximum clamping voltage (VC) of P4SMA18CAHE3_A/H is 25.2 V at 15.9 A peak pulse current (10/1000 µs waveform). This value represents the highest voltage imposed on protected circuitry during a surge event - directly determining whether downstream components like 3.3 V or 5 V microcontrollers, ADCs, or transceivers remain within safe operating limits. A lower VC relative to system supply rails ensures effective protection without overstressing sensitive ICs.
How does the SMA (DO-214AC) package of P4SMA18CAHE3_A/H compare to SMB or SMC packages?
The SMA (DO-214AC) package of P4SMA18CAHE3_A/H measures 4.93 mm × 3.99 mm × 2.29 mm - smaller than SMB (DO-214AA, ~6.2 mm × 4.6 mm) and significantly smaller than SMC (DO-214AB, ~7.1 mm × 6.2 mm). This enables higher board density and better high-frequency performance due to lower parasitic inductance. While SMBJ18CA offers higher 600 W pulse power, the P4SMA18CAHE3_A/H's 400 W rating is sufficient for most automotive and industrial I/O protection, with superior space efficiency and full AEC-Q101 compliance.
Can P4SMA18CAHE3_A/H be used in place of a unidirectional TVS like P4SMA18A?
No - P4SMA18CAHE3_A/H is strictly bidirectional and cannot replace unidirectional devices like P4SMA18A in circuits requiring DC blocking or polarity-specific clamping (e.g., DC power rail protection with defined anode/cathode orientation). Substituting it in such applications risks improper clamping behavior or failure to suppress negative-going transients. Always verify circuit topology: use P4SMA18CAHE3_A/H only where symmetrical protection of AC signals, differential buses, or floating nodes is required.
P4SMA18CAHE3_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:
- -
- Bidirectional Channels:
- 1
- 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)
P4SMA18CAHE3_A/H FAQ
1.How can I place an order for P4SMA18CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA18CAHE3_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 P4SMA18CAHE3_A/H reliable?
The price and inventory of P4SMA18CAHE3_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 P4SMA18CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for P4SMA18CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA18CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA18CAHE3_A/H?
P4SMA18CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA18CAHE3_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 P4SMA18CAHE3_A/H?
For technical support, including P4SMA18CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA18CAHE3_A/H requirements.
6.How does Aetrix verify that P4SMA18CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All P4SMA18CAHE3_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 P4SMA18CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of P4SMA18CAHE3_A/H?
All P4SMA18CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA18CAHE3_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 P4SMA18CAHE3_A/H part is unused and in its original packaging.
Return procedure for P4SMA18CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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