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Taiwan Semiconductor Corporation SMAJ8.0C
- Part No.:
- SMAJ8.0C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0C.pdf
- Description:
- 400W, 9.9V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,131
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Product details
Overview
SMAJ8.0C from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 8.0V working stand-off voltage, 8.89–10.90V breakdown voltage at 1mA test current, and 15.0V maximum clamping voltage at 50A peak pulse current; used for overvoltage protection in DC/DC converters and power adapters.
For engineers reviewing the SMAJ8.0C datasheet, SMAJ8.0C pinout, SMAJ8.0C application, or SMAJ8.0C equivalent, key selection criteria include clamping voltage under 10/1000μs surge, reverse leakage <1μA at 8V, unidirectional polarity marking, DO-214AC thermal and mechanical compatibility, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance for automotive electronics.
Technical Context
The SMAJ8.0C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 8.89–10.90V breakdown range, clamping transients to ≤15.0V at 50A. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1μA at VWM = 8V).
Designed for 10/1000μs waveform surges, it delivers 400W peak pulse power up to 78V VWM - derated linearly above 25°C ambient per Fig.2. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements in its molded DO-214AC case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 8.89 V / 10.90 V at IT = 1 mA - Confirmed avalanche onset range for reliable triggering margin |
| VC @ IPPM | 15.0 V at IPPM = 50 A - Clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPPM | 400 W (10/1000μs) - Peak transient energy absorption capability at TA = 25°C |
| IR @ VWM | <1 μA - Minimal leakage current ensures low standby power loss in protected circuits |
| TJ max | 150 °C - Maximum junction temperature enabling operation in high-ambient industrial environments |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with cathode band polarity marking |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode indicated by a band on the body; weight ≈ 0.060 g; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; enables normal forward bias operation |
| Cathode | Reverse-biased clamping terminal | Marked with band; connected to higher-potential rail to initiate avalanche during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| Fast response time <1.0 ps | Enables suppression before sensitive ICs experience damaging overvoltage |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive load-dump and inductive-switching transient immunity |
| RoHS & halogen-free | Meets IEC 61249-2-21 and environmental compliance for global manufacturing |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Protection against input voltage spikes and switching noise in AC/DC front-end stages. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input rails to clamp transients before they reach PWM controller and MOSFETs. Use Value: Limits peak rail voltage to ≤15.0V during 50A surges, preventing gate oxide damage and controller latch-up. | Use Scenario: Safeguarding low-voltage outputs (e.g., 3.3V/5V) of point-of-load regulators in embedded systems. IC Role / Device Role / Timing Role: Secondary-side TVS placed at converter output to absorb reflected transients from motor or relay loads. Use Value: Maintains regulated output integrity during fast-rising load dumps, with <1μA leakage preserving efficiency. |
| Lighting Application | Adapter Protection |
Use Scenario: Overvoltage suppression in LED driver circuits exposed to lightning-induced surges on mains-connected lines. IC Role / Device Role / Timing Role: Primary-side unidirectional TVS absorbing differential-mode surges upstream of bridge rectifier. Use Value: Clamps 10/1000μs transients to 15.0V while sustaining 400W peak power, compatible with DO-214AC board space constraints. | Use Scenario: Input-stage protection in wall-mounted AC/DC adapters subject to ESD and line disturbances. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 8.0V) placed after fuse but before input capacitor to limit surge propagation. Use Value: Provides certified ISO 7637-2 immunity without increasing bill-of-materials count or PCB area beyond standard SMA footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0A | Lower VBR range (8.89–9.83V), tighter tolerance; same VWM, VC = 13.6V at 50A | Better clamping performance (1.4V lower VC) for margin-critical 5V rail protection | Select SMAJ8.0A when lower clamping voltage is prioritized over broader VBR distribution |
| P6SMB8.0C | Same DO-214AC package, 400W rating, but VBR = 8.9–9.8V and VC = 13.6V; manufactured by Vishay | Identical electrical envelope and footprint; validated in automotive-grade adapter designs | Choose P6SMB8.0C for dual-sourcing where Vishay qualification is required |
Compared with SMAJ8.0C, SMAJ8.0A offers improved clamping (13.6V vs. 15.0V) at identical surge current, while P6SMB8.0C provides second-source assurance with matching DO-214AC mechanicals and tested ISO 7637-2 compliance - both retain unidirectional polarity and sub-1μA leakage at 8V.
Availability
SMAJ8.0C is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMAJ8.0C 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and automotive markets since 1979.
The SMAJ series is part of TSC's transient protection product line, engineered specifically for high-reliability, surface-mount surge suppression in power conversion and automotive electronics where compact size, repeatable clamping, and international standard compliance are critical.
FAQ
What is the clamping voltage of SMAJ8.0C at its rated peak pulse current?
The SMAJ8.0C has a maximum clamping voltage (VC) of 15.0 V at 50 A peak impulse current under the standardized 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees predictable overvoltage limiting during surge events, directly protecting downstream components such as controllers and MOSFETs in the SMAJ8.0C-protected circuit.
Is SMAJ8.0C unidirectional or bidirectional, and how is polarity identified?
SMAJ8.0C is a unidirectional TVS diode, indicated by the "C" suffix per Taiwan Semiconductor's naming convention. Polarity is marked by a cathode band on the DO-214AC package body - the banded end connects to the higher-potential side of the protected line. This configuration ensures proper avalanche conduction only during reverse overvoltage, unlike bidirectional "CA" variants.
Does SMAJ8.0C meet automotive transient immunity standards?
Yes, SMAJ8.0C meets ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). Its 400W peak pulse power rating, fast <1.0 ps response, and DO-214AC thermal robustness make it suitable for engine control units, body electronics, and infotainment power rails where SMAJ8.0C is deployed.
What is the maximum operating junction temperature for SMAJ8.0C?
The SMAJ8.0C has a maximum operating junction temperature (TJ) of +150°C, as specified in its Absolute Maximum Ratings table. This allows reliable operation in high-ambient environments such as enclosed power supplies or under-hood automotive modules. Derating curves (Fig.2) define allowable power reduction above 25°C ambient, ensuring safe thermal margins for sustained SMAJ8.0C deployment.
How does SMAJ8.0C differ from SMAJ8.0A in practical design use?
SMAJ8.0C has a wider VBR range (8.89–10.90 V) versus SMAJ8.0A (8.89–9.83 V), resulting in a higher maximum clamping voltage (15.0 V vs. 13.6 V at 50 A). In practice, SMAJ8.0A provides tighter voltage control and lower let-through stress, making it preferable for 5V rail protection where margin is constrained; SMAJ8.0C offers broader statistical VBR distribution for cost-sensitive, high-volume SMAJ8.0C applications.
SMAJ8.0C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 15V
- Current - Peak Pulse (10/1000µs):
- 26.7A
- 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)
SMAJ8.0C FAQ
1.How can I place an order for SMAJ8.0C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0C 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 SMAJ8.0C reliable?
The price and inventory of SMAJ8.0C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.0C is usually 5 days.
3.What payment methods are accepted for SMAJ8.0C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0C?
SMAJ8.0C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0C 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 SMAJ8.0C?
For technical support, including SMAJ8.0C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0C requirements.
6.How does Aetrix verify that SMAJ8.0C is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0C 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 SMAJ8.0C meets industry standards.
7.What is the process for return or replacement of SMAJ8.0C?
All SMAJ8.0C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0C, 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 SMAJ8.0C part is unused and in its original packaging.
Return procedure for SMAJ8.0C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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