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Taiwan Semiconductor Corporation SMAJ10
- Part No.:
- SMAJ10
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ10.pdf
- Description:
- 400W, 12.4V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,667
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Product details
Overview
SMAJ10 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal paths. It features a 10 V working stand-off voltage (VWM), 11.1–13.6 V breakdown voltage (VBR) at 1 mA test current, 18.8 V maximum clamping voltage (VC) at 21.3 A peak pulse current, and 400 W peak pulse power rating per 10/1000 μs waveform - deployed in switching mode power supplies and on-board DC/DC converters.
For engineers reviewing the SMAJ10 datasheet, SMAJ10 pinout, SMAJ10 application, or SMAJ10 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, junction temperature derating above 25°C, DO-214AC (SMA) package compatibility with automated placement, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMAJ10 operates as a silicon avalanche diode with glass-passivated junction, delivering sub-1 ps response time from 0 V to VBR min. Its unidirectional configuration provides reverse-biased transient suppression only, with forward conduction limited to 3.5 V at 25 A surge current.
It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements in its DO-214AC molded package. The device is rated for -55°C to +150°C operating junction temperature and supports single-pulse energy absorption without thermal runaway when applied within derated power limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10 V - Maximum continuous reverse voltage before significant leakage; defines safe operating DC bias level |
| VBR min/max | 11.1 / 13.6 V @ 1 mA - Ensures reliable avalanche initiation across manufacturing lot variation |
| VC @ IPPM | 18.8 V @ 21.3 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's max stress level |
| PPPM | 400 W - Peak pulse power handling capability; validates compliance with ISO 7637-2 Pulse 1 & 2b |
| IR @ VWM | ≤5 μA - Low leakage preserves efficiency in high-impedance standby circuits |
| TJ max | +150 °C - Enables operation in thermally constrained environments like enclosed power adapters |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking on one end; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional TVS configuration |
| Cathode | Avalanche clamping output terminal | Connected to protected line (e.g., +12 V rail); cathode band identifies this terminal on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and long-term reliability under repeated surge stress |
| Sub-1 ps response time | Clamps ESD and fast transients before downstream ICs experience overstress |
| ISO 7637-2 compliance | Validated for automotive load-dump and inductive-switching immunity testing (Pulse 1/2a/2b/3a/3b) |
| Moisture sensitivity level 1 | Eliminates bake requirement prior to reflow; compatible with standard SMT assembly |
Applications
| Switching Mode Power Supply (SMPS) | On-Board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifier outputs against flyback spikes and cross-talk. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input/output rails to clamp transient excursions exceeding VWM. Use Value: Limits voltage overshoot to ≤18.8 V during 400 W surges, preventing latch-up or oxide breakdown in adjacent controllers and MOSFETs. | Use Scenario: Input rail protection in point-of-load (POL) converters powering FPGAs or microprocessors. IC Role / Device Role / Timing Role: Standoff-rated clamping element absorbing coupled noise from adjacent digital switching domains. Use Value: Maintains <5 μA leakage at 10 V, minimizing quiescent current impact while suppressing >21 A transients per IEC 61000-4-5. |
| Lighting Application | Adapter Input Stage |
Use Scenario: Overvoltage safeguard for LED driver ICs subjected to mains-coupled surges in outdoor luminaires. IC Role / Device Role / Timing Role: Primary-line TVS on AC-DC front-end rectified output, positioned before bulk capacitor. Use Value: Withstands 40 A non-repetitive forward surge (IFSM), enabling robustness against inrush-related stress during cold start. | Use Scenario: Input-stage protection in wall-mounted AC/DC adapters exposed to lightning-induced surges. IC Role / Device Role / Timing Role: First-line defense between bridge rectifier and primary switcher, rated for 10/1000 μs waveform. Use Value: Delivers 400 W peak pulse power at 25°C, derating linearly to ~250 W at 85°C ambient per Fig.2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ10A | Narrower VBR range (11.1–12.3 V vs. 11.1–13.6 V); tighter 5% tolerance | Better suited for precision-clamp designs where VC consistency is critical | Select SMAJ10A when clamping voltage repeatability across temperature matters more than cost |
| P6SMB10 | Same DO-214AC package; 10 V VWM but higher VC = 19.5 V @ 20.5 A; 600 W PPPM | Higher power rating supports longer-duration transients but requires layout review for thermal dissipation | Choose P6SMB10 only if system-level testing confirms need for >400 W surge margin |
Compared with SMAJ10A and P6SMB10, the SMAJ10 offers balanced clamping performance (18.8 V), industry-standard 400 W rating, and lowest unit cost in the SMAJ family - making it optimal for cost-sensitive industrial adapters and lighting drivers where ±10% VBR variation is acceptable.
Availability
SMAJ10 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply across extended production cycles.
Supply support for SMAJ10 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 global industrial, computing, and consumer markets since 1979.
The SMAJ series was developed specifically for surface-mount transient suppression in automotive and industrial power systems, emphasizing ISO 7637-2 compliance, automated assembly readiness, and high-temperature reliability up to +150°C junction.
FAQ
What is the maximum clamping voltage of SMAJ10 under a 10/1000 μs surge?
The SMAJ10 has a maximum clamping voltage (VC) of 18.8 V when subjected to its rated peak pulse current of 21.3 A using the standardized 10/1000 μs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ10 maintains this clamping performance across its specified operating temperature range, with minor derating above 25°C per the manufacturer's pulse derating curve.
Is SMAJ10 suitable for bidirectional transient protection?
No, SMAJ10 is a unidirectional TVS diode intended for reverse-biased transient suppression only. Its electrical characteristics apply solely in the reverse direction; forward conduction follows standard diode behavior with VF ≈ 3.5 V at 25 A. For bidirectional protection, the SMAJ10A variant is not applicable - instead, use SMAJ10CA or SMAJ10C, which feature symmetrical breakdown in both polarities. The SMAJ10 must be oriented on PCB with cathode toward the protected line.
What is the moisture sensitivity level (MSL) rating for SMAJ10?
The SMAJ10 is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/85% RH and is exempt from floor-life limitations or pre-reflow baking. This simplifies SMT assembly logistics and eliminates moisture-related popcorning risk during reflow. The DO-214AC (SMA) package uses UL 94V-0 compliant molding compound and matte tin-plated leads meeting J-STD-002 solderability requirements.
How does SMAJ10 compare to SMAJ10A in terms of breakdown voltage tolerance?
SMAJ10 specifies a VBR range of 11.1–13.6 V (±12.5% typical), whereas SMAJ10A tightens this to 11.1–12.3 V (±5% typical). This narrower tolerance improves clamping consistency across production lots and reduces worst-case VC variation in high-reliability systems. Both parts share identical VWM (10 V), IR (≤5 μA), and PPPM (400 W), but SMAJ10A's tighter VBR makes it preferable for designs where precise clamping threshold is critical - though SMAJ10 remains optimal for cost-driven applications.
Does SMAJ10 meet automotive transient immunity standards?
Yes, SMAJ10 meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a (sudden load disconnect), Pulse 2b (supply interruption), Pulse 3a (capacitive coupling), and Pulse 3b (line impedance coupling). Its 400 W peak pulse power rating, sub-1 ps response time, and guaranteed clamping voltage ensure robust protection in 12 V automotive subsystems such as body control modules and infotainment power rails. The SMAJ10 is not AEC-Q200 qualified, so system-level validation is required for automotive deployment.
SMAJ10 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 10V
- Voltage - Breakdown (Min):
- 11.1V
- Voltage - Clamping (Max) @ Ipp:
- 18.8V
- Current - Peak Pulse (10/1000µs):
- 21.3A
- 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)
SMAJ10 FAQ
1.How can I place an order for SMAJ10 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ10 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 SMAJ10 reliable?
The price and inventory of SMAJ10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ10 is usually 5 days.
3.What payment methods are accepted for SMAJ10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ10?
SMAJ10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ10 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 SMAJ10?
For technical support, including SMAJ10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ10 requirements.
6.How does Aetrix verify that SMAJ10 is sourced from the original manufacturer or authorized distributors?
All SMAJ10 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 SMAJ10 meets industry standards.
7.What is the process for return or replacement of SMAJ10?
All SMAJ10 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ10, 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 SMAJ10 part is unused and in its original packaging.
Return procedure for SMAJ10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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