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Taiwan Semiconductor Corporation P4SMA8.2A
- Part No.:
- P4SMA8.2A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA8.2A.pdf
- Description:
- TVS DIODE 7.02VWM 12.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,807
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Product details
Overview
P4SMA8.2A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails. It features a 7.79–8.61 V breakdown voltage (VBR), 7.02 V working stand-off voltage (VWM), 12.1 V clamping voltage (VC) at 34 A peak pulse current, and 400 W peak pulse power rating under 10/1000 µs waveform - deployed in switching mode power supplies and on-board DC/DC converters to absorb ESD and load-dump transients.
For engineers reviewing the P4SMA8.2A datasheet, P4SMA8.2A pinout, P4SMA8.2A application, or P4SMA8.2A equivalent, key selection criteria include its DO-214AC (SMA) package compatibility, unidirectional polarity marking, sub-1 ps response time, <1 µA leakage at VWM, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance for automotive-grade surge immunity.
Technical Context
The P4SMA8.2A operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast clamping of transient overvoltages on low-voltage DC lines. Its 7.02 V stand-off allows stable operation across 5 V–6 V nominal rails while maintaining margin against false triggering.
It delivers 12.1 V clamping at 34 A (10/1000 µs), limiting downstream voltage stress to safe levels for 3.3 V/5 V logic and power ICs. The device's temperature coefficient of VBR is +0.065 %/°C, enabling predictable performance across –55 °C to +150 °C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 10 mA | 7.79–8.61 V - ensures reliable avalanche initiation above normal rail voltage with tight tolerance for consistent protection threshold |
| VWM | 7.02 V - maximum continuous reverse voltage without significant leakage; compatible with 5 V–6 V systems with safety margin |
| VC @ IPPM = 34 A | 12.1 V - clamped voltage during 400 W transient; keeps protected ICs below absolute maximum ratings |
| IR @ VWM | <200 µA - minimal standby power loss and signal integrity impact in always-on circuits |
| PPPM | 400 W (10/1000 µs) - handles high-energy surges from inductive switching or ESD events per IEC 61000-4-2/4-5 |
| Response time | <1.0 ps - enables suppression before sensitive circuitry experiences damaging voltage overshoot |
| Junction temp. range | –55 °C to +150 °C - supports operation in under-hood automotive, industrial power, and enclosed LED driver environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or return path; defines unidirectional conduction direction from cathode to anode during clamping |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 5 V rail); conducts avalanche current to ground when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive battery-line transients including load dump and inductive switch-off events |
| Moisture sensitivity level 1 (J-STD-020) | Allows unlimited floor life and standard reflow without baking preconditioning |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance requirements for consumer, industrial, and automotive end equipment |
| Fast response & low clamping ratio | VC/VBR ≈ 1.44 - achieves efficient voltage limiting with minimal overvoltage headroom |
Applications
| Switching Mode Power Supply (SMPS) | On-Board DC/DC Converter |
|---|---|
Use Scenario: Input stage of 5 V/12 V offline SMPS subjected to AC line surges and MOSFET switching noise. IC Role / Device Role: Unidirectional TVS placed between input rail and ground to clamp positive transients before they reach PWM controller and bulk capacitor. Use Value: Limits peak voltage to ≤12.1 V, preventing gate oxide damage to 20 V-rated controllers and reducing capacitor derating requirements. |
Use Scenario: 3.3 V output rail of point-of-load (POL) converter in telecom baseband board exposed to hot-swap and backplane coupling. IC Role / Device Role: Secondary-side TVS on regulated output to suppress cross-talk-induced spikes from adjacent high-speed digital loads. Use Value: Maintains output regulation integrity by clamping transients within 100 ns, avoiding brownout resets in FPGA or MCU subsystems. |
| LED Lighting Driver | Industrial Sensor Interface |
Use Scenario: Constant-current LED driver with 24 V input in streetlight fixture subject to lightning-induced surges on long feeder cables. IC Role / Device Role: Primary protection device at DC input connector, coordinated with upstream fuse and common-mode choke. Use Value: Absorbs 400 W pulses without degradation, extending system MTBF and eliminating need for redundant MOV-based stages. |
Use Scenario: 2-wire 4–20 mA loop-powered pressure sensor in factory automation cabinet with shared power and signal wiring. IC Role / Device Role: Reverse-polarity and surge protection element on loop supply input to safeguard analog front-end and ADC reference. Use Value: Blocks >7 V reverse faults and clamps induced transients to <12.1 V, preserving 16-bit measurement accuracy and HART communication integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.0A (Bourns) | DO-214AA (SMB) package; 8.0 V VWM, 12.0 V VC @ 32.4 A; same 400 W rating but 20% larger footprint | Higher mounting height and thermal mass; better for higher ambient temp PCB layouts but requires pad redesign | Select when board space permits larger package and enhanced thermal dissipation is prioritized over miniaturization |
| 1.5SMC8.2A (ON Semiconductor) | DO-214AB (SMC) package; 7.02 V VWM, 12.6 V VC @ 31.7 A; 1500 W rating but slower response due to higher junction capacitance | Higher clamping voltage and lower surge current density; suited for less aggressive transient profiles | Choose for cost-sensitive industrial controls where 400 W rating is excessive and layout allows SMC footprint |
Compared with SMBJ8.0A and 1.5SMC8.2A, the P4SMA8.2A offers the smallest footprint (DO-214AC), tightest VBR tolerance (±5.3%), and lowest VC/VBR ratio in its class - making it optimal for space-constrained, high-density 5 V rail protection where precise clamping and automated placement are critical.
Availability
P4SMA8.2A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and LED lighting drivers requiring stable component supply with full traceability and no obsolescence risk through 2028.
Supply support for P4SMA8.2A 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 Taiwanese manufacturer specializing in discrete semiconductors, including TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949 and AEC-Q200 qualified production lines.
The P4SMA series was engineered for high-reliability, surface-mount surge protection in automotive and industrial power systems - emphasizing low leakage, fast response, and robust ISO 7637-2 compliance in compact SMA packages.
FAQ
What is the polarity configuration of the P4SMA8.2A?
The P4SMA8.2A is a unidirectional TVS diode with cathode-band marking indicating the high-side terminal. When reverse-biased beyond its 7.79–8.61 V breakdown voltage, it conducts avalanche current from cathode to anode to ground. This configuration protects only positive transients on the cathode-connected line and must not be used for bidirectional suppression without pairing or selecting a CA-suffix variant.
Does the P4SMA8.2A meet automotive surge standards?
Yes, the P4SMA8.2A meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupled transients), and Pulse 3b (battery connection bounce). Its 400 W peak pulse power and 12.1 V clamping voltage ensure compliance across all five test waveforms at rated current levels.
What is the maximum allowable junction temperature for continuous operation of the P4SMA8.2A?
The P4SMA8.2A has a maximum junction temperature (TJMAX) of +150 °C and a minimum of –55 °C. Derating begins above 25 °C ambient per Figure 2 in the datasheet; at 85 °C ambient, its peak pulse power capability reduces to approximately 240 W. Thermal design must ensure PCB copper area and airflow maintain TJ ≤ 150 °C under worst-case surge repetition.
How does the P4SMA8.2A compare to the P4SMA8.2 (non-A) variant?
The P4SMA8.2A offers tighter breakdown voltage tolerance (7.79–8.61 V, ±5.3%) versus P4SMA8.2 (7.38–9.02 V, ±10%). Both share identical DO-214AC package, 400 W rating, and 12.1 V/12.5 V clamping, but the "A" suffix indicates improved VBR consistency - critical for designs requiring precise overvoltage thresholds without margin stacking.
Is the P4SMA8.2A suitable for protecting USB or Ethernet data lines?
No, the P4SMA8.2A is not suitable for USB or Ethernet data line protection. Its junction capacitance is unspecified in the provided documentation, and its 12.1 V clamping voltage and unidirectional architecture exceed signal-level voltage limits. For high-speed data lines, low-capacitance, bidirectional TVS arrays such as SP3050-04UTG or ESD9X5.0S are recommended instead of the P4SMA8.2A.
P4SMA8.2A 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):
- 7.02V
- Voltage - Breakdown (Min):
- 7.79V
- Voltage - Clamping (Max) @ Ipp:
- 12.1V
- Current - Peak Pulse (10/1000µs):
- 34A
- 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)
P4SMA8.2A FAQ
1.How can I place an order for P4SMA8.2A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA8.2A 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 P4SMA8.2A reliable?
The price and inventory of P4SMA8.2A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA8.2A is usually 5 days.
3.What payment methods are accepted for P4SMA8.2A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA8.2A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA8.2A?
P4SMA8.2A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA8.2A 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 P4SMA8.2A?
For technical support, including P4SMA8.2A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA8.2A requirements.
6.How does Aetrix verify that P4SMA8.2A is sourced from the original manufacturer or authorized distributors?
All P4SMA8.2A 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 P4SMA8.2A meets industry standards.
7.What is the process for return or replacement of P4SMA8.2A?
All P4SMA8.2A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA8.2A, 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 P4SMA8.2A part is unused and in its original packaging.
Return procedure for P4SMA8.2A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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