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Taiwan Semiconductor Corporation P4SMA120A
- Part No.:
- P4SMA120A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA120A.pdf
- Description:
- TVS DIODE 102VWM 165VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,009
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Product details
Overview
P4SMA120A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power (10/1000μs), 102V working stand-off voltage (VWM), and 165V maximum clamping voltage (VC@IPPM). It protects DC/DC converters, SMPS, and lighting circuits against ESD and surge transients per ISO 7637-2.
For engineers reviewing the P4SMA120A datasheet, P4SMA120A pinout, P4SMA120A application, or P4SMA120A equivalent, key selection criteria include its 114–126V breakdown range (VBR @ 1mA), <1μA reverse leakage at VWM, 150°C max junction temperature, unidirectional polarity, and compliance with J-STD-020 Level 1 moisture sensitivity.
Technical Context
The P4SMA120A uses a glass-passivated silicon junction to achieve fast transient response (<1.0ps) and stable clamping under repetitive surge stress. Its unidirectional configuration provides asymmetric protection-low forward voltage (3.5V @ 25A) enables use in DC-biased lines while maintaining high reverse isolation above 102V.
Designed for automotive and industrial environments, it meets ISO 7637-2 Pulse 1/2a/2b/3a/3b test profiles and operates across –55°C to +150°C. The DO-214AC package supports automated placement and complies with UL 94V-0 flammability and JESD201 Class 2 whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 102 V - Maximum continuous reverse operating voltage before significant leakage begins |
| VBR min/max | 114–126 V @ 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on during overvoltage events |
| VC @ IPPM | 165 V @ 2.5 A (10/1000μs) - Clamped voltage limiting downstream circuit stress during 400W surge |
| IR @ VWM | <1 μA - Negligible standby power loss and minimal signal interference in high-impedance nodes |
| PPPM | 400 W - Peak pulse power handling capability per standard 10/1000μs waveform |
| TJ max | +150 °C - Enables operation in under-hood automotive or enclosed industrial power supplies |
| Package | DO-214AC (SMA) - Surface-mount footprint compatible with standard reflow processes and IPC-7351B land patterns |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads; cathode indicated by band marking; polarity-critical for unidirectional operation; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input / Surge return path | Connected to system ground or low-side reference; carries full surge current during clamping |
| Cathode | Protected line connection / High-side clamp node | Connected to line being protected (e.g., 12V rail); blocks >102V reverse bias until breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime; eliminates surface degradation under humidity or bias stress |
| Fast response time | <1.0 ps - Limits voltage overshoot before clamping engages, critical for protecting fast-switching MOSFET gates |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| J-STD-020 Level 1 | Unlimited floor life at ≤30°C/60% RH - eliminates bake requirements prior to SMT assembly |
| RoHS & halogen-free | Meets IEC 61249-2-21 - supports environmentally compliant manufacturing and end-of-life recycling |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Input rectifier stage of 100–200V AC/DC front-end or output rail of isolated flyback converter. IC Role / Device Role / Timing Role: Unidirectional TVS placed across bulk capacitor or secondary-side rectifier to clamp switch-node ringing and line surges. Use Value: Limits transient voltage to ≤165V, preventing damage to 200V-rated MOSFETs or output capacitors rated at 160V. | Use Scenario: Protection of 12V or 24V intermediate bus in automotive ADAS ECUs or industrial PLC modules. IC Role / Device Role / Timing Role: Parallel-connected TVS on DC input rail upstream of buck controller IC to absorb load-dump energy. Use Value: Withstands 400W pulses per ISO 7637-2 Pulse 5a without degradation, preserving regulator IC reliability. |
| Lighting Application | Adapters |
Use Scenario: LED driver input stage in streetlight or commercial downlight systems exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-side surge suppression on AC-input bridge output or DC-link capacitor. Use Value: Clamps 10/1000μs transients to 165V, protecting 150V-rated electrolytic capacitors and gate drivers. | Use Scenario: Secondary-side overvoltage protection in universal-input wall adapters powering IoT sensors or USB-C PD accessories. IC Role / Device Role / Timing Role: Unidirectional clamp on regulated 5V/9V/12V output rail to prevent fault propagation to connected devices. Use Value: Sub-μA leakage ensures no impact on no-load efficiency; 102V VWM avoids false triggering during normal 12V ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A | Same VWM (102V), higher PPPM (600W), DO-214AA (SMB) package - 2.6mm wider body | Requires PCB layout change; better suited for higher-energy surges where space allows | Select SMBJ120A only if system-level testing shows 400W insufficient and board area permits larger footprint |
| 1.5SMC120A | Same VWM/VC, PPPM = 1500W, DO-214AB (SMC) package - 3x larger than SMA | Not suitable for space-constrained designs; used in main AC input stages, not secondary rails | Choose 1.5SMC120A for primary-side protection where surge energy exceeds 400W and thermal mass is available |
Compared with SMBJ120A and 1.5SMC120A, the P4SMA120A delivers optimal balance of surge robustness, compact DO-214AC footprint, and low-profile mounting - making it ideal for secondary-side protection where board space and height are constrained but 400W rating suffices.
Availability
P4SMA120A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for P4SMA120A 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, with global distribution and AEC-Q qualified product lines.
The P4SMA120A belongs to TSC's P4SMAxx(A) family of surface-mount TVS diodes engineered for cost-effective, high-reliability transient suppression in automotive, industrial, and consumer power systems.
FAQ
What is the breakdown voltage range of the P4SMA120A?
The P4SMA120A has a guaranteed breakdown voltage (VBR) range of 114 V to 126 V at 1 mA test current, measured per ANSI/IEEE C62.35. This tight tolerance ensures predictable clamping onset across production lots and temperature extremes, critical for protecting 120V-rated components without premature conduction.
Is the P4SMA120A bidirectional or unidirectional?
The P4SMA120A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. It conducts only in reverse breakdown (cathode positive) and blocks forward current up to 3.5 V at 25 A. For bidirectional protection, TSC offers the P4SMA120CA variant - the P4SMA120A must be oriented correctly on PCB with cathode toward the protected line.
What is the maximum clamping voltage of the P4SMA120A under surge conditions?
The P4SMA120A clamps to a maximum of 165 V when subjected to its rated 400W peak pulse (10/1000μs waveform), corresponding to 2.5 A peak impulse current. This value is verified per JEDEC test methods and defines the upper voltage limit imposed on downstream circuitry during transient events.
Does the P4SMA120A meet automotive surge immunity standards?
Yes, the P4SMA120A meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) requirements. Its 400W rating, 150°C junction rating, and J-STD-020 Level 1 moisture sensitivity make it suitable for under-hood and body-control module applications when used within derated power limits.
What is the packaging format for the P4SMA120A?
The P4SMA120A is supplied in DO-214AC (SMA) package on 7,500-piece tape-and-reel format per ordering code P4SMA120A. The package features matte tin-plated leads, UL 94V-0 molding compound, and cathode band marking for unidirectional polarity identification - fully compatible with standard SMT reflow profiles.
P4SMA120A 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):
- 102V
- Voltage - Breakdown (Min):
- 114V
- Voltage - Clamping (Max) @ Ipp:
- 165V
- Current - Peak Pulse (10/1000µs):
- 2.5A
- 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)
P4SMA120A FAQ
1.How can I place an order for P4SMA120A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA120A 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 P4SMA120A reliable?
The price and inventory of P4SMA120A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA120A is usually 5 days.
3.What payment methods are accepted for P4SMA120A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA120A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA120A?
P4SMA120A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA120A 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 P4SMA120A?
For technical support, including P4SMA120A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA120A requirements.
6.How does Aetrix verify that P4SMA120A is sourced from the original manufacturer or authorized distributors?
All P4SMA120A 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 P4SMA120A meets industry standards.
7.What is the process for return or replacement of P4SMA120A?
All P4SMA120A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA120A, 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 P4SMA120A part is unused and in its original packaging.
Return procedure for P4SMA120A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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