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Taiwan Semiconductor Corporation P4SMA18H
- Part No.:
- P4SMA18H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA18H.pdf
- Description:
- 400W, 18V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,792
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Product details
Overview
P4SMA18H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power, 16.2–19.8V breakdown voltage (VBR), and 26.5V clamping voltage (VC) at 16A peak impulse current. It provides robust ESD and surge protection for DC power rails in automotive-grade switching mode power supplies and on-board DC/DC converters.
For engineers reviewing the P4SMA18H datasheet, P4SMA18H pinout, P4SMA18H application, or P4SMA18H equivalent, key selection criteria include its AEC-Q101 qualification, 1μA max reverse leakage at 14.5V working stand-off voltage, <1.0ps response time, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and moisture sensitivity level 1 handling.
Technical Context
The P4SMA18H operates as a unidirectional avalanche diode with glass-passivated junction, designed to clamp transient overvoltages above its 14.5V working stand-off voltage (VWM) while maintaining sub-1μA leakage up to that threshold. Its 26.5V clamping voltage at 16A (10/1000μs waveform) ensures downstream ICs remain within safe operating limits during load dump or inductive switching events.
It features a single-die configuration in DO-214AC package, rated for -55°C to +150°C junction temperature, with matte tin-plated leads compliant to J-STD-002 solderability and JESD201 Class 2 whisker resistance. Polarity is marked by cathode band per standard SMA orientation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 16.2V / 19.8V - defines minimum and maximum guaranteed avalanche onset under 1mA test current; sets lower bound for reliable clamping activation |
| VWM | 14.5V - maximum continuous reverse voltage before significant leakage; must exceed system nominal DC rail (e.g., 12V automotive) |
| VC @ IPPM | 26.5V @ 16A - clamped voltage during 10/1000μs surge; determines maximum stress on protected circuitry |
| PPPM | 400W - peak pulse power rating; validates capability to absorb standardized ISO 7637-2 transients without failure |
| IR @ VWM | <1μA - ultra-low leakage ensures minimal standby power loss and no interference with high-impedance sensing nodes |
| Response time | <1.0ps - enables suppression of fast-rising ESD and lightning-induced transients before damage occurs |
| TJ max | +150°C - supports operation in under-hood automotive environments and thermally constrained PCB layouts |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-ended unidirectional configuration with cathode band marking. Dimensions conform to JEDEC DO-214AC outline; weight ≈0.060g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage return path; forms current path during reverse-biased clamping |
| Cathode | Protected line input | Connected to the line being protected (e.g., 12V rail); conducts avalanche current when VIN exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control, body modules, and infotainment power rails |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Guarantees survivability against real-world automotive transients: Pulse 1 (inductive load dump), Pulse 2a/2b (switching spikes), Pulse 3a/3b (capacitive coupling) |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking; eliminates production delays and moisture-related popcorning |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives for environmentally compliant manufacturing and end-of-life recycling |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator overshoot. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and system ground to shunt surge energy before it reaches PMIC or MCU power inputs. Use Value: Clamps transients to ≤26.5V, preserving 3.3V/5V regulator input integrity and preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: Safeguarding isolated DC/DC converter primary-side input in factory automation controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Fast-response TVS absorbing repetitive 10/1000μs surges induced by nearby contactor switching. Use Value: 400W rating and <1μA leakage ensure stable operation across wide temperature range (-55°C to +150°C) without degrading converter efficiency or regulation. |
| LED Driver Supply Protection | Telecom Power Adapter Interface |
Use Scenario: Shielding constant-current LED driver ICs from voltage spikes generated by hot-plug events or cable ESD in streetlight and signage applications. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of driver input capacitor to prevent overvoltage triggering of internal OVP circuits. Use Value: 14.5V VWM allows compatibility with 12V nominal systems while 26.5V VC avoids false triggering of driver fault logic during normal operation. | Use Scenario: Front-end surge suppression in universal-input AC/DC adapters used in telecom base station auxiliary power modules. IC Role / Device Role / Timing Role: Primary-side TVS on rectified DC bus to meet IEC 61000-4-5 Level 3 (2kV line-earth) immunity requirements. Use Value: AEC-Q101 qualification and UL 94V-0 molding compound support high-reliability deployment in mission-critical infrastructure equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | DO-214AA (SMB) package; 600W rating; 18V nominal VBR; bidirectional variant available | Higher power handling but larger footprint; requires PCB layout change due to different pad dimensions | Select SMBJ18A only if >400W surge margin is required and board space permits SMB package |
| 1.5SMC18A | DO-214AB (SMC) package; 1500W rating; same 18V VBR range; higher VC (29.2V) | Designed for higher-energy transients (e.g., IEC 61000-4-5); not AEC-Q101 qualified | Choose 1.5SMC18A for industrial mains-connected equipment where automotive qualification is unnecessary |
Compared with SMBJ18A and 1.5SMC18A, the P4SMA18H offers optimal balance of AEC-Q101 compliance, compact DO-214AC footprint, and precise 14.5V VWM/26.5V VC performance for space-constrained automotive and embedded DC power protection.
Availability
P4SMA18H is available at Aetrix Electronics and suitable for automotive electronics, industrial DC/DC converters, LED lighting drivers, and telecom power adapter designs requiring stable component supply and full traceability.
Supply support for P4SMA18H 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 Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The P4SMA series belongs to TSC's AEC-Q101-qualified surface-mount TVS portfolio, engineered specifically for robust transient suppression in harsh automotive and high-reliability embedded environments.
FAQ
What is the polarity configuration of the P4SMA18H?
The P4SMA18H is a unidirectional TVS diode with cathode band marking on the DO-214AC (SMA) package. Its anode connects to ground and cathode to the protected line, enabling clamping only during positive transients relative to ground. This configuration matches standard 12V automotive power rail protection topologies and differs from bidirectional variants like P4SMA18AH.
Does the P4SMA18H meet automotive qualification standards?
Yes, the P4SMA18H is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. It is rated for operation from -55°C to +150°C junction temperature and carries moisture sensitivity level 1 per J-STD-020 - confirming suitability for automotive under-hood and chassis-mounted applications.
What is the maximum clamping voltage of the P4SMA18H under surge conditions?
The P4SMA18H has a maximum clamping voltage (VC) of 26.5V at 16A peak impulse current using the 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry sees no more than 26.5V during standardized surge events, making it compatible with 3.3V and 5V logic supply rails downstream of proper filtering.
Can the P4SMA18H be used in bidirectional signal line protection?
No, the P4SMA18H is unidirectional and unsuitable for bidirectional signal line protection. For symmetrical transient suppression on data lines or AC-coupled interfaces, select the bidirectional variant P4SMA18AH (marked BEJ), which exhibits identical VBR, VWM, and VC in both polarities and is explicitly designated for bidirectional applications per the datasheet.
What packaging and reel quantity is available for the P4SMA18H?
The P4SMA18H is supplied in DO-214AC (SMA) package on 7,500-piece tape-and-reel format per ordering code P4SMA18H. The reel complies with EIA-481-D standards and includes matte tin-plated leads certified to J-STD-002 for solderability, supporting automated SMT placement without pre-baking due to its J-STD-020 Level 1 moisture rating.
P4SMA18H 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):
- 14.5V
- Voltage - Breakdown (Min):
- 16.2V
- Voltage - Clamping (Max) @ Ipp:
- 26.5V
- Current - Peak Pulse (10/1000µs):
- 16A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA18H FAQ
1.How can I place an order for P4SMA18H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA18H 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 P4SMA18H reliable?
The price and inventory of P4SMA18H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA18H is usually 5 days.
3.What payment methods are accepted for P4SMA18H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA18H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA18H?
P4SMA18H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA18H 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 P4SMA18H?
For technical support, including P4SMA18H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA18H requirements.
6.How does Aetrix verify that P4SMA18H is sourced from the original manufacturer or authorized distributors?
All P4SMA18H 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 P4SMA18H meets industry standards.
7.What is the process for return or replacement of P4SMA18H?
All P4SMA18H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA18H, 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 P4SMA18H part is unused and in its original packaging.
Return procedure for P4SMA18H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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