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Taiwan Semiconductor Corporation P4SMA8.2
- Part No.:
- P4SMA8.2
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA8.2.pdf
- Description:
- 400W, 8.2V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,526
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Product details
Overview
P4SMA8.2 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for primary overvoltage protection in DC power rails. It features a 7.38–9.02 V breakdown voltage (VBR), 6.63 V working stand-off voltage (VWM), 12.5 V clamping voltage (VC) at 33 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in SMPS input stages, DC/DC converters, and lighting drivers.
For engineers reviewing the P4SMA8.2 datasheet, P4SMA8.2 pinout, P4SMA8.2 application, or P4SMA8.2 equivalent, this page delivers verified electrical parameters, JEDEC-compliant DO-214AC mechanical data, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance status, and direct alternative part comparisons with documented parameter divergence.
Technical Context
The P4SMA8.2 operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-1 ps response time and <1 µA reverse leakage at 6.63 V. Its clamping action limits transient-induced voltage excursions during ESD or load-dump events in low-voltage DC systems.
Rated for -55°C to +150°C junction temperature, it supports automated SMT placement and meets J-STD-020 moisture sensitivity level 1. The device is not bidirectional - no "C" or "CA" suffix - and requires cathode-band orientation during PCB layout per DO-214AC marking diagram.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 7.38 V / 9.02 V at 10 mA test current - defines minimum and maximum guaranteed avalanche initiation threshold under standardized DC stress |
| VWM | 6.63 V - maximum continuous reverse operating voltage before significant leakage; sets safe DC rail margin for 5 V or 6 V systems |
| VC @ IPPM | 12.5 V at 33 A (10/1000 µs) - peak clamped voltage seen by protected circuit during worst-case surge; determines downstream IC survivability |
| IR @ VWM | 200 µA max - reverse leakage at stand-off voltage; impacts quiescent power loss and signal integrity in high-impedance nodes |
| PPPM | 400 W - peak pulse power handling capability per standard 10/1000 µs waveform; defines single-event energy absorption limit |
| TJ max | +150 °C - maximum junction temperature; enables operation in thermally constrained enclosures without derating below 25 °C ambient |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with 0.060 g mass, UL 94V-0 molding, and matte tin-plated leads |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with axial leadform, cathode band marking on one end, compliant with JEDEC DO-214AC standard dimensions and soldering requirements per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail; conducts during forward surge (e.g., reverse polarity fault) |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., +5 V rail); initiates breakdown when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Clamping voltage ≤12.5 V at 33 A | Ensures protected 5 V logic or analog circuits remain within absolute maximum ratings during ISO 7637-2 Pulse 1 transients |
| Response time <1.0 ps | Fast enough to suppress ESD events (IEC 61000-4-2) before damage occurs to sensitive downstream components |
| Moisture sensitivity level 1 | Eliminates bake preconditioning requirement prior to reflow, reducing manufacturing cost and process complexity |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally restricted substances in final assembly |
Applications
| Switching Mode Power Supply (SMPS) Input Protection | LED Lighting Driver Rail Clamp |
|---|---|
Use Scenario: Protects AC/DC adapter front-end rectifier output against line surges and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rectified DC+ and ground, clamping transients before they reach PWM controller IC. Use Value: Limits voltage excursion to ≤12.5 V during 400 W surges, preserving 16 V-rated input capacitors and 20 V-rated MOSFET gate oxides. |
Use Scenario: Shields constant-current LED driver ICs from flyback voltage spikes generated by inductive load switching. IC Role / Device Role / Timing Role: Mounted across driver output terminals to clamp reverse EMF from LED string inductance during PWM dimming transitions. Use Value: Prevents latch-up in 5 V logic interfaces by suppressing >10 V transients within sub-nanosecond response window. |
| On-board DC/DC Converter Input Stage | USB-C Power Delivery Line Guard |
Use Scenario: Secures 12 V-to-3.3 V buck converter input against hot-swap transients and backplane coupling noise. IC Role / Device Role / Timing Role: TVS connected between converter VIN and GND, activated only during >6.63 V excursions to avoid interference with normal regulation. Use Value: Maintains 200 µA leakage at 6.63 V, preventing measurable dropout in low-quiescent-current PMICs. |
Use Scenario: Guards USB-C VBUS line in portable devices against accidental 20 V PD negotiation surges or cable disconnect arcs. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, absorbing positive-only transients while ignoring negative-going common-mode noise. Use Value: Withstands 33 A peak current without degradation, enabling robust protection without derating for repeated 10/1000 µs events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.0A (Bourns) | 8.0 V nominal VBR, 13.6 V VC @ 29.4 A, DO-214AA (SMB) package - 1.6 mm wider body than DO-214AC | Higher clamping voltage reduces margin for 5 V logic; SMB footprint requires PCB redesign | Select when higher IPPM (29.4 A vs. 33 A) and tighter VBR tolerance (5%) are prioritized over board space |
| 1.5SMC8.2 (ON Semiconductor) | 8.2 V nominal VBR, 12.6 V VC @ 31.7 A, DO-214AB (SMC) package - 2.5× larger footprint, 1.2 g mass | Lower clamping voltage improves protection margin but SMC size prohibits dense-layout designs | Choose for industrial environments requiring higher thermal mass and 1.5 kW peak power rating, accepting larger PCB area |
Compared with SMBJ8.0A and 1.5SMC8.2, the P4SMA8.2 offers optimal balance of low-profile DO-214AC packaging, 12.5 V clamping headroom for 5 V systems, and 33 A surge capacity - making it preferred for space-constrained consumer and automotive interior electronics where footprint and weight are critical.
Availability
P4SMA8.2 is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and on-board DC/DC converters requiring stable component supply with full traceability and lifecycle management.
Supply support for P4SMA8.2 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 industrial, automotive, and consumer markets.
The P4SMA series targets cost-sensitive, high-volume surge protection applications demanding JEDEC-standard packaging, ISO 7637-2 compliance, and automated assembly compatibility - optimized for SMT lines in power adapter and lighting OEM factories.
FAQ
What is the polarity configuration of the P4SMA8.2?
The P4SMA8.2 is a unidirectional TVS diode with clearly marked cathode band per DO-214AC package outline. It conducts in forward bias (anode-to-cathode) and clamps in reverse bias above VBR. Unlike bidirectional variants (e.g., P4SMA8.2C), it does not suppress negative transients - correct orientation is mandatory during PCB layout to avoid functional failure.
Does the P4SMA8.2 meet automotive transient immunity standards?
Yes, the P4SMA8.2 meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) requirements. Its 400 W peak pulse rating and 12.5 V clamping voltage enable compliance in 12 V automotive subsystems such as body control modules and infotainment power inputs - confirmed in TSC's S2102 specification document.
What is the maximum reverse leakage current for the P4SMA8.2 at its working stand-off voltage?
The P4SMA8.2 exhibits a maximum reverse leakage current (IR) of 200 µA at its rated working stand-off voltage (VWM) of 6.63 V, measured at 25°C. This value ensures minimal standby power loss in battery-powered lighting or IoT edge devices, and remains stable across its -55°C to +150°C operating junction temperature range.
Can the P4SMA8.2 be used in bidirectional signal line protection?
No, the P4SMA8.2 is strictly unidirectional and unsuitable for bidirectional signal lines like RS-485 or CAN bus. For symmetrical transient suppression, engineers must select the P4SMA8.2C variant (with "C" suffix), which provides matched breakdown characteristics in both polarities and is explicitly characterized for bipolar applications per TSC documentation.
What is the thermal derating behavior of the P4SMA8.2 above 25°C ambient?
The P4SMA8.2 follows standard JEDEC derating curves: its 400 W peak pulse power rating decreases linearly above 25°C ambient, reaching ~200 W at 75°C and ~100 W at 125°C. This derating is defined in Figure 2 of the TSC S2102 datasheet and must be applied when designing for enclosed, high-temperature environments such as LED driver housings or automotive engine bays.
P4SMA8.2 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):
- 6.63V
- Voltage - Breakdown (Min):
- 7.38V
- Voltage - Clamping (Max) @ Ipp:
- 12.5V
- Current - Peak Pulse (10/1000µs):
- 33A
- 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)
P4SMA8.2 FAQ
1.How can I place an order for P4SMA8.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA8.2 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 P4SMA8.2 reliable?
The price and inventory of P4SMA8.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA8.2 is usually 5 days.
3.What payment methods are accepted for P4SMA8.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA8.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA8.2?
P4SMA8.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA8.2 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 P4SMA8.2?
For technical support, including P4SMA8.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA8.2 requirements.
6.How does Aetrix verify that P4SMA8.2 is sourced from the original manufacturer or authorized distributors?
All P4SMA8.2 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 P4SMA8.2 meets industry standards.
7.What is the process for return or replacement of P4SMA8.2?
All P4SMA8.2 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA8.2, 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 P4SMA8.2 part is unused and in its original packaging.
Return procedure for P4SMA8.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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