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Taiwan Semiconductor Corporation P4SMA18A
- Part No.:
- P4SMA18A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA18A.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,066
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Product details
Overview
P4SMA18A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power lines and signal paths. It features a 15.3 V working stand-off voltage, 17.1–18.9 V breakdown voltage at 1 mA, 25.5 V maximum clamping voltage at 16.5 A (10/1000 µs), and 400 W peak pulse power dissipation - deployed in switching mode power supplies, onboard DC/DC converters, and lighting drivers.
For engineers reviewing the P4SMA18A datasheet, P4SMA18A pinout, P4SMA18A application, or P4SMA18A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, DO-214AC (SMA) package compatibility with automated placement, and ≤1 µA reverse leakage at VWM, critical for low-power system integrity and ESD robustness.
Technical Context
The P4SMA18A operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps) to transient overvoltages while maintaining stable clamping behavior across -55°C to +150°C junction temperature range. Its single-die DO-214AC construction supports high surge immunity without derating up to 125°C ambient.
Designed per ANSI/IEEE C62.35, it delivers precise voltage threshold control via tightly specified VBR (17.1–18.9 V) and low temperature coefficient (0.088 %/°C), ensuring predictable protection margin in automotive and industrial environments subject to thermal cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets safe DC bias margin. |
| VBR @ IT=1 mA | 17.1–18.9 V - Breakdown voltage range defining turn-on threshold; ensures reliable activation during transients. |
| VC @ IPPM=16.5 A | 25.5 V - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels. |
| PPPM | 400 W - Peak pulse power handling capability; sustains ISO 7637-2-compliant load dump surges. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves battery life and signal integrity in always-on circuits. |
| TJ max | +150 °C - Maximum junction temperature rating; enables operation in high-ambient industrial enclosures. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-ended unidirectional configuration with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input / transient return path | Connected to protected line (e.g., +12V rail); conducts surge current toward ground when clamped. |
| Cathode | Reverse-biased reference terminal | Connected to system ground; defines polarity-sensitive clamping direction and enables unidirectional protection. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures long-term reliability and stable VBR under humidity and thermal stress per J-STD-020 Level 1. |
| Fast response time | <1.0 ps - Limits voltage overshoot during nanosecond-scale ESD events (IEC 61000-4-2). |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line spikes) in automotive ECUs. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant manufacturing. |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifier outputs against flyback spikes and cross-conduction transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across input/output rails to limit voltage excursions during switching transitions. Use Value: Prevents gate oxide rupture in MOSFETs and latch-up in controller ICs by clamping to 25.5 V at 16.5 A, within safe SOA limits. | Use Scenario: Input rail protection in point-of-load (POL) converters powering FPGAs, microcontrollers, or sensors in industrial PLCs. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor on 3.3 V, 5 V, or 12 V input bus to absorb coupled noise from adjacent switching stages. Use Value: Maintains <1 µA leakage at 15.3 V VWM, avoiding quiescent current penalty while delivering 400 W surge capacity. |
| Lighting Application | Automotive Body Control Module |
Use Scenario: Overvoltage suppression on LED driver input in streetlight or automotive headlamp systems exposed to load dump. IC Role / Device Role / Timing Role: Primary-line TVS absorbing 12 V/24 V system surges before they reach constant-current LED controllers. Use Value: Withstands 40 A IFSM non-repetitive surge and meets UL 94V-0 flammability for enclosed luminaires. | Use Scenario: CAN/LIN bus power rail protection in BCMs subjected to ISO 7637-2 Pulse 1 (−150 V, 50 Ω, 2 Ω series) and Pulse 2b (−100 V, 2 Ω). IC Role / Device Role / Timing Role: Unidirectional clamping device on 12 V supply feeding microcontroller and driver ICs. Use Value: Clamps to 25.5 V within 1 ps, preventing reset or brownout during validated automotive transients without affecting normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A (Bourns) | Same DO-214AA package; 18 V nominal VBR, 28.8 V VC @ 13.9 A; 600 W PPPM. | Higher clamping voltage (+3.3 V) and lower IPPM (13.9 A vs. 16.5 A); suitable where higher surge energy tolerance is prioritized over tight clamping. | Select SMBJ18A if system-level testing shows margin for elevated VC; verify PCB pad layout compatibility with DO-214AA footprint. |
| 1.5SMC18A (ON Semiconductor) | DO-214AB package; identical VWM/VBR/VC specs; 400 W rating; same 1 µA IR. | Same electrical performance but larger SMC package (7.1 × 6.2 mm vs. SMA's 4.5 × 2.7 mm); requires board rework for space-constrained designs. | Choose 1.5SMC18A only when existing design uses SMC footprint or thermal mass requirements exceed SMA capability. |
Compared with SMBJ18A and 1.5SMC18A, the P4SMA18A offers optimal balance of compact DO-214AC size, low 25.5 V clamping, and proven ISO 7637-2 compliance - making it preferred for space-limited automotive and industrial DC/DC modules where precise voltage limiting is critical.
Availability
P4SMA18A is available at Aetrix Electronics and suitable for switching mode power supplies, onboard DC/DC converters, and lighting applications requiring stable component supply, consistent parametric performance, and full traceability across production batches.
Supply support for P4SMA18A 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
Taiwan Semiconductor Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial, automotive, and consumer markets.
The P4SMA18A belongs to TSC's P4SMAx family of 400 W surface-mount TVS diodes engineered specifically for robust, automated-placement-ready overvoltage protection in harsh-environment power conversion systems.
FAQ
What is the maximum clamping voltage of the P4SMA18A under standard test conditions?
The P4SMA18A has a maximum clamping voltage (VC) of 25.5 V when subjected to a 10/1000 µs surge current pulse of 16.5 A. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry remains below critical voltage thresholds during transient events - a key specification confirmed in Taiwan Semiconductor's S2102 datasheet revision.
Is the P4SMA18A suitable for bidirectional transient protection?
No, the P4SMA18A is a unidirectional TVS diode intended for DC line protection with defined anode-cathode polarity. For bidirectional applications, Taiwan Semiconductor specifies the P4SMA18CA variant (with 'CA' suffix), which provides symmetrical clamping in both directions - the P4SMA18A must be oriented correctly with cathode to ground to function as intended.
What package type does the P4SMA18A use, and is it compatible with automated SMT assembly?
The P4SMA18A uses the DO-214AC (SMA) surface-mount package, featuring matte tin-plated leads that comply with J-STD-002 solderability standards. Its standardized footprint and polarity marking (cathode band) make it fully compatible with high-speed pick-and-place equipment and reflow processes used in volume electronics manufacturing.
Does the P4SMA18A meet automotive transient immunity standards?
Yes, the P4SMA18A is explicitly rated to meet ISO 7637-2 for automotive applications, covering Pulse 1 (inductive switch-off), Pulse 2a/2b (supply interruption and coupling), and Pulse 3a/3b (capacitive coupling and ignition noise). This validation is documented in the official Taiwan Semiconductor datasheet (Version S2102) and supports its use in body control modules and infotainment power supplies.
What is the junction temperature range and storage limit for the P4SMA18A?
The P4SMA18A has an operating junction temperature range of −55°C to +150°C and a storage temperature range of −55°C to +150°C. These ratings are defined in the Absolute Maximum Ratings table and confirm suitability for under-hood automotive locations, industrial motor drives, and outdoor lighting enclosures where thermal extremes are encountered - all verified in Taiwan Semiconductor's official documentation.
P4SMA18A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA
- 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:
- 25.5V
- Current - Peak Pulse (10/1000µs):
- 16.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA18A FAQ
1.How can I place an order for P4SMA18A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA18A 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 P4SMA18A reliable?
The price and inventory of P4SMA18A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA18A is usually 5 days.
3.What payment methods are accepted for P4SMA18A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA18A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA18A?
P4SMA18A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA18A 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 P4SMA18A?
For technical support, including P4SMA18A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA18A requirements.
6.How does Aetrix verify that P4SMA18A is sourced from the original manufacturer or authorized distributors?
All P4SMA18A 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 P4SMA18A meets industry standards.
7.What is the process for return or replacement of P4SMA18A?
All P4SMA18A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA18A, 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 P4SMA18A part is unused and in its original packaging.
Return procedure for P4SMA18A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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