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Taiwan Semiconductor Corporation P4SMA120C
- Part No.:
- P4SMA120C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA120C.pdf
- Description:
- 400W, 120V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,082
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Product details
Overview
P4SMA120C from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 108–132 V breakdown voltage (VBR), 97.2 V working stand-off voltage (VWM), 173 V maximum clamping voltage (VC) at 2.4 A peak pulse current, and 400 W peak pulse power rating under 10/1000 µs waveform - deployed in automotive power supplies and industrial DC/DC converters.
For engineers reviewing the P4SMA120C datasheet, P4SMA120C pinout, P4SMA120C application, or P4SMA120C equivalent, this page delivers verified electrical parameters, bidirectional TVS behavior, ISO 7637-2 compliance, thermal derating curves, and direct alternatives with documented clamping and leakage differences - all critical for surge immunity validation in 24 V/48 V systems.
Technical Context
The P4SMA120C implements a glass-passivated silicon junction optimized for fast transient suppression, with sub-1 ps response time and <1 µA reverse leakage at VWM. Its bidirectional configuration enables symmetric clamping in AC-coupled or floating-rail applications without polarity constraints.
Rated for -55 °C to +150 °C junction operation and compliant with JESD201 Class 2 whisker resistance, it supports high-reliability deployment in engine control units and railway power modules where thermal cycling and mechanical shock are present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1 mA | 108–132 V - ensures reliable triggering above nominal 96 V DC bus during load dump transients |
| VWM | 97.2 V - defines maximum continuous operating voltage before leakage exceeds 1 µA |
| VC @ IPPM = 2.4 A | 173 V - limits downstream IC stress during ISO 7637-2 Pulse 5a (load dump) |
| PPPM | 400 W - sustains single 10/1000 µs surges up to 2.4 A without degradation |
| Junction Temp Range | -55 °C to +150 °C - supports under-hood automotive placement without derating loss |
| Moisture Sensitivity | Level 1 per J-STD-020 - enables standard reflow without baking or special handling |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; 0.060 g mass; UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient return path for negative excursions | Completes bidirectional clamping loop; connects to GND or low-impedance reference plane |
| Cathode (banded end) | Transient return path for positive excursions | Connects to protected line (e.g., 48 V rail); forms symmetrical clamp with anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or floating DC buses without external polarity management |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance | Validated for automotive EMI immunity testing - eliminates need for supplemental filtering in OEM designs |
| Fast response <1 ps | Clamps transients before sensitive logic or analog circuitry experiences overvoltage damage |
| Glass passivated junction | Ensures stable VBR over 1000+ surge events and prevents parameter drift in humid environments |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU Directive 2011/65/EU - supports green manufacturing and export compliance |
Applications
| Automotive Power Supply | Industrial DC/DC Converter |
|---|---|
Use Scenario: Protection of 48 V battery-fed ECUs against load dump pulses (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Bidirectional TVS clamping device placed at input filter stage, directly after fuse and before bulk capacitor. Use Value: Limits rail voltage to ≤173 V during 120 V/100 ms transients, preventing MOSFET gate oxide rupture and MCU brownout. |
Use Scenario: Input surge suppression in isolated 24 V to 5 V flyback converters used in PLC I/O modules. IC Role / Device Role / Timing Role: Primary-side transient absorber across input terminals, coordinated with MOV and common-mode choke. Use Value: Absorbs 400 W energy without failure, maintaining output regulation and avoiding secondary-side overvoltage propagation. |
| LED Driver Power Stage | Telecom Power Interface |
Use Scenario: Overvoltage protection on constant-current LED driver inputs exposed to 277 V AC line surges via rectification. IC Role / Device Role / Timing Role: Fast-clamping element parallel to bulk electrolytic, triggered before input rectifier avalanche. Use Value: Clamps 10/1000 µs surges to 173 V, extending capacitor lifetime by reducing RMS ripple stress and dielectric heating. |
Use Scenario: Ethernet-powered (PoE) midspan injector front-end protection against induced lightning surges on 48 V feed lines. IC Role / Device Role / Timing Role: First-line bidirectional suppressor before DC-DC controller and hot-swap FET. Use Value: Withstands repeated 2.4 A impulses while maintaining <1 µA leakage at 97.2 V, preserving PoE classification accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA (Bourns) | Same VWM (97 V), but higher VC = 193 V at 2.1 A; 600 W rating; SMB package (larger footprint) | Preferred where higher surge margin is needed but board space allows SMB footprint | Select SMBJ120CA if system-level testing requires >400 W headroom or legacy layout uses SMB pads |
| 1.5KE120CA (Littelfuse) | Through-hole TO-218; same VBR/VC specs but 1.5 kW rating; slower thermal recovery | Suitable for prototyping or low-volume assemblies where reworkability outweighs SMT density | Choose 1.5KE120CA only for manual assembly or when existing through-hole infrastructure prohibits SMT adoption |
Compared with P4SMA120C, SMBJ120CA offers higher surge capacity but requires PCB redesign, while 1.5KE120CA sacrifices miniaturization and automated placement for ease of hand-soldering - making P4SMA120C optimal for high-density automotive and industrial SMT production.
Availability
P4SMA120C is available at Aetrix Electronics and suitable for automotive power modules, industrial DC/DC converters, and LED driver designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for P4SMA120C 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, and rectifiers since 1979, headquartered in Hsinchu Science Park.
The P4SMA120C belongs to TSC's P4SMAx series of surface-mount TVS diodes engineered for automotive-grade transient immunity and industrial power rail protection - emphasizing reliability under thermal stress and surge repetition.
FAQ
What is the polarity configuration of the P4SMA120C?
The P4SMA120C is a bidirectional TVS diode, indicated by the "C" suffix, meaning it provides symmetrical clamping for both positive and negative transients without requiring orientation during placement. Its DO-214AC package has a cathode band, but this marking does not imply unidirectional operation - the internal structure is back-to-back diodes enabling full AC protection capability.
Does the P4SMA120C meet ISO 7637-2 requirements?
Yes, the P4SMA120C is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test waveforms per its official datasheet (Version S2102). This certification confirms its suitability for automotive electronic control units subject to conducted transients from switching loads, alternator load dump, and inductive kickback.
What is the maximum clamping voltage of the P4SMA120C at rated surge current?
The P4SMA120C has a maximum clamping voltage (VC) of 173 V when subjected to its rated peak pulse current of 2.4 A under the standard 10/1000 µs waveform. This value is measured at the device terminals and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Can the P4SMA120C be used in place of a unidirectional TVS like P4SMA120A?
No - the P4SMA120C and P4SMA120A are functionally distinct: the "C" version is bidirectional, while the "A" version is unidirectional. Substituting P4SMA120C for P4SMA120A may cause unintended conduction in DC-biased circuits. Always verify signal polarity and grounding topology before replacement; they are not drop-in equivalents.
What is the moisture sensitivity level (MSL) of the P4SMA120C?
The P4SMA120C has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions (<30 °C / 60% RH) and processed using standard reflow profiles without pre-baking. This eliminates handling restrictions and simplifies SMT line integration.
P4SMA120C 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 97.2V
- Voltage - Breakdown (Min):
- 108V
- Voltage - Clamping (Max) @ Ipp:
- 173V
- Current - Peak Pulse (10/1000µs):
- 2.4A
- 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)
P4SMA120C FAQ
1.How can I place an order for P4SMA120C through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA120C 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 P4SMA120C reliable?
The price and inventory of P4SMA120C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA120C is usually 5 days.
3.What payment methods are accepted for P4SMA120C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA120C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA120C?
P4SMA120C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA120C 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 P4SMA120C?
For technical support, including P4SMA120C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA120C requirements.
6.How does Aetrix verify that P4SMA120C is sourced from the original manufacturer or authorized distributors?
All P4SMA120C 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 P4SMA120C meets industry standards.
7.What is the process for return or replacement of P4SMA120C?
All P4SMA120C units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA120C, 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 P4SMA120C part is unused and in its original packaging.
Return procedure for P4SMA120C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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