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Vishay General Semiconductor - Diodes Division P4SMA18CA-M3/61
- Part No.:
- P4SMA18CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA18CA-M3/61.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA18CA-M3/61 from Vishay General Semiconductor is a bidirectional surface-mount TRANSZORB® transient voltage suppressor (TVS) designed for clamping inductive switching surges and lightning-induced transients across signal and power lines. It features a 18 V standoff voltage (VWM), 25.2 V maximum clamping voltage (VC) at 15.9 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line receivers.
For engineers reviewing the P4SMA18CA-M3/61 datasheet, P4SMA18CA-M3/61 pinout, P4SMA18CA-M3/61 application, or P4SMA18CA-M3/61 equivalent, key selection criteria include bidirectional clamping symmetry, SMA (DO-214AC) package thermal performance, AEC-Q101 qualification status, and compliance with UL 497B surge protector classification.
Technical Context
The P4SMA18CA-M3/61 operates as a bidirectional avalanche diode, delivering symmetrical reverse/forward breakdown behavior with VBR min/max of 17.1 V / 18.9 V at 1 mA test current. Its low incremental surge resistance enables rapid voltage clamping during fast-rising transients (e.g., ESD, inductive kickback), while the glass-passivated junction ensures stable leakage (<1 µA at VWM) and long-term reliability under repetitive stress.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, requiring minimum 5.0 mm × 5.0 mm copper pads per terminal for rated 400 W pulse handling. The device is halogen-free, RoHS-compliant, and qualified to AEC-Q101 when ordered with HM3 suffix - though P4SMA18CA-M3/61 itself carries M3 commercial-grade marking per ordering table.
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 V to 18.9 V at 1 mA - Symmetrical avalanche onset in both directions; ensures consistent transient response polarity-independently. |
| VC (Clamping Voltage) | 25.2 V at 15.9 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; determines downstream IC survivability. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability under standardized 10/1000 µs waveform; derates above 25 °C ambient. |
| ID (Reverse Leakage) | <1 µA at 15.3 V - Minimal standby current draw; critical for low-power sensor and battery-backed systems. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
SMA (DO-214AC) package: molded epoxy case with matte tin-plated leads, UL 94 V-0 flammability rating, and no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current from either direction; connects to line being protected (e.g., RS-485 A/B, CAN H/L). |
| Cathode | Transient current exit (bidirectional) | Completes low-impedance path to ground or return rail during clamping; symmetric with Anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both polarities - eliminates need for orientation-aware layout in differential or AC-coupled lines. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 50 Ω source impedance without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage stress on downstream components - critical for 3.3 V and 5 V logic interface protection. |
| AEC-Q101 qualification option | HM3 variant available - validated for automotive applications including engine control, ADAS sensors, and infotainment buses. |
| MSL Level 1 moisture sensitivity | Reflow-compatible up to 260 °C peak without baking - simplifies manufacturing and reduces assembly risk. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting ABS wheel speed sensor outputs from load dump and alternator ripple in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential sensor output pair to clamp ±200 V transients. Use Value: Prevents latch-up or gate oxide damage in downstream signal conditioners while maintaining signal integrity below 25.2 V. |
Use Scenario: Shielding RS-485 transceivers in factory automation PLCs from ground loop surges and EFT bursts. IC Role / Device Role / Timing Role: Line-to-line and line-to-ground clamping on A/B bus lines using dual P4SMA18CA-M3/61 devices. Use Value: Enables reliable 10 Mbps data transmission under IEC 61000-4-4 (4 kV EFT) and IEC 61000-4-5 (2 kV surge) immunity testing. |
| Telecom Line Receiver Protection | Consumer USB Port ESD Guard |
Use Scenario: Safeguarding DSL or VoIP line interface ICs against lightning-induced common-mode surges on twisted-pair inputs. IC Role / Device Role / Timing Role: Bidirectional clamping between tip/ring and chassis ground in front-end hybrid transformer circuits. Use Value: Limits induced voltage to ≤25.2 V during 10/1000 µs surges, preserving analog front-end dynamic range and ADC accuracy. |
Use Scenario: Adding secondary-level ESD protection on USB 2.0 D+/D− lines behind primary polymer TVS arrays. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF at 0 V) bidirectional clamp absorbing ±15 kV contact discharge per IEC 61000-4-2. Use Value: Reduces system-level failure rate in drop-test scenarios without degrading 480 Mbps signal rise/fall times. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Same VWM (15.3 V) and VC (25.2 V), but SMB package (DO-214AA); 600 W PPPM rating. | Larger footprint (4.58 mm × 3.94 mm vs. SMA's 4.50 mm × 5.28 mm); higher thermal mass improves sustained surge handling. | Select SMBJ18CA when board space allows and higher single-pulse energy (600 W) is required beyond P4SMA18CA-M3/61's 400 W limit. |
| 1.5KE18CA | Through-hole TO-204AE (DO-201AE); same VWM/VC specs but 1500 W PPPM and higher IPPM (65.2 A). | Requires wave soldering or hand-soldering; unsuitable for fully SMT production; used in legacy or high-reliability power supply designs. | Choose 1.5KE18CA only for through-hole prototyping, repair, or where mechanical robustness outweighs automated assembly needs. |
Compared with SMBJ18CA and 1.5KE18CA, the P4SMA18CA-M3/61 offers optimal balance of compact SMA footprint, AEC-Q101-ready M3 material compliance, and sufficient 400 W surge capacity for space-constrained automotive and industrial PCBs - without requiring layout redesign or process change.
Availability
P4SMA18CA-M3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, and telecom line receiver circuits requiring stable component supply, halogen-free compliance, and traceable sourcing.
Supply support for P4SMA18CA-M3/61 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 optimization.
The P4SMA Series targets cost-sensitive, high-volume transient suppression needs in automotive, industrial, and communications equipment - delivering standardized TVS performance in compact, automated-assembly-ready packages.
FAQ
What is the clamping voltage of P4SMA18CA-M3/61 at its rated peak pulse current?
The P4SMA18CA-M3/61 has a maximum clamping voltage (VC) of 25.2 V when subjected to its rated 15.9 A peak pulse current with a 10/1000 µs waveform. This value is measured under 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 surge events. The P4SMA18CA-M3/61 maintains this clamping performance bidirectionally due to its symmetrical avalanche structure.
Is P4SMA18CA-M3/61 qualified to AEC-Q101?
No - P4SMA18CA-M3/61 carries the M3 suffix indicating halogen-free, RoHS-compliant commercial grade construction. For AEC-Q101 qualification, the correct part is P4SMA18CAHM3_A/H or P4SMA18CAHM3_A/I, which include the HM3 automotive-grade marking and full qualification documentation. The P4SMA18CA-M3/61 is not tested or certified to AEC-Q101 requirements.
What does the "CA" suffix mean in P4SMA18CA-M3/61?
The "CA" suffix in P4SMA18CA-M3/61 denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both forward and reverse directions, with identical breakdown and clamping characteristics. This distinguishes it from unidirectional variants (e.g., P4SMA18A-M3/61), which require correct cathode orientation and only suppress in one polarity. The P4SMA18CA-M3/61 has no polarity marking on its SMA package.
What is the maximum operating temperature for P4SMA18CA-M3/61?
The P4SMA18CA-M3/61 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 values - RθJA = 120 °C/W and RθJL = 30 °C/W - indicate that proper PCB copper pad design (minimum 5.0 mm × 5.0 mm per terminal) is essential to maintain safe junction temperatures under repeated 400 W pulse conditions. The P4SMA18CA-M3/61 remains functional within this full range when derated per Figure 2 in the datasheet.
How does P4SMA18CA-M3/61 differ from P4SMA18A-M3/61?
The P4SMA18CA-M3/61 is bidirectional with symmetrical clamping in both polarities, while P4SMA18A-M3/61 is unidirectional and requires correct cathode orientation. Key differences include: VBR tolerance (17.1–18.9 V for CA vs. 17.1–18.9 V for A, same range), but unidirectional A-type has forward voltage drop (VF = 3.5 V at 25 A) and IFSM = 40 A rating - features absent in the CA version. The P4SMA18CA-M3/61 has no band marking; the P4SMA18A-M3/61 uses a cathode band for polarity identification.
P4SMA18CA-M3/61 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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA18CA-M3/61 FAQ
1.How can I place an order for P4SMA18CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA18CA-M3/61 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 P4SMA18CA-M3/61 reliable?
The price and inventory of P4SMA18CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA18CA-M3/61 is usually 5 days.
3.What payment methods are accepted for P4SMA18CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA18CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA18CA-M3/61?
P4SMA18CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA18CA-M3/61 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 P4SMA18CA-M3/61?
For technical support, including P4SMA18CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA18CA-M3/61 requirements.
6.How does Aetrix verify that P4SMA18CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All P4SMA18CA-M3/61 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 P4SMA18CA-M3/61 meets industry standards.
7.What is the process for return or replacement of P4SMA18CA-M3/61?
All P4SMA18CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA18CA-M3/61, 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 P4SMA18CA-M3/61 part is unused and in its original packaging.
Return procedure for P4SMA18CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA18CA-M3/61 Tags
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