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Taiwan Semiconductor Corporation SMAJ110
- Part No.:
- SMAJ110
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ110.pdf
- Description:
- 300W, 135.5V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:9,356
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Product details
Overview
SMAJ110 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast transients in DC power lines. It features a 110 V working stand-off voltage (VWM), 122–149 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤196 V at 1.6 A peak impulse current under 10/1000 µs waveform, with 400 W peak pulse power rating.
For engineers reviewing the SMAJ110 datasheet, SMAJ110 pinout, SMAJ110 application, or SMAJ110 equivalent, key selection criteria include its unidirectional polarity, 1.6 µA max reverse leakage at 110 V, -55°C to +150°C operating junction temperature, ISO 7637-2 compliance for automotive transients, and suitability for SMPS input protection and on-board DC/DC converters.
Technical Context
The SMAJ110 operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown and low leakage. Its clamping response is sub-nanosecond (<1.0 ps from 0 V to VBR min), enabling effective suppression of ESD and load-dump spikes in automotive and industrial power rails.
It is rated for 400 W peak pulse power (10/1000 µs), derated linearly above 25°C ambient per Fig.2, and supports up to 40 A non-repetitive forward surge (8.3 ms half-sine). The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 110 V - Maximum continuous reverse voltage before clamping begins; defines safe operating DC bus level. |
| VBR min/max | 122 V / 149 V @ 1 mA - Tight breakdown window ensures predictable turn-on across production lots. |
| VC @ IPPM | ≤196 V @ 1.6 A - Clamping voltage limits downstream IC stress during ISO 7637-2 Pulse 1/2b/3b events. |
| PPPM | 400 W (10/1000 µs) - Sustains high-energy surges without failure; derates to ~300 W above 78 V nominal. |
| IR @ VWM | ≤1.6 µA - Ultra-low leakage preserves efficiency in high-impedance bias networks and battery-powered systems. |
| TJ range | -55°C to +150°C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor power supplies. |
Pinout & Package
DO-214AC (SMA) surface-mount package: cathode-banded end denotes the cathode terminal; anode is the unmarked end. Matte tin-plated leads comply with J-STD-002 solderability; moisture sensitivity level (MSL) is Level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to lower-potential side of protected line. | Provides low VF (~3.5 V @ 25 A) path during surge conduction; must be routed with low-inductance trace. |
| Cathode | Current exit point in forward bias; connected to higher-potential rail (e.g., VBUS or battery+). | Defines polarity-device only clamps when cathode is ≥110 V above anode; reverse connection causes open-circuit failure mode. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of VBR and IR over temperature and lifetime; eliminates passivation-related drift in harsh environments. |
| Sub-1 ps response time | Clamps ESD and fast-rising transients before sensitive downstream circuitry (e.g., MCU I/O or PMIC inputs) experiences overvoltage. |
| ISO 7637-2 compliance | Validated for automotive load-dump (Pulse 2b), supply interruption (Pulse 3a/3b), and coupled noise (Pulse 1/2a) immunity per OEM requirements. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; supports green manufacturing and end-of-life recycling mandates. |
Applications
| Switching Mode Power Supply (SMPS) | Automotive On-Board Charger |
|---|---|
Use Scenario: Input stage protection against AC line surges and rectifier reverse recovery spikes in 100–300 W offline SMPS. IC Role / Device Role / Timing Role: Unidirectional TVS placed between bulk capacitor and bridge rectifier output to clamp differential-mode transients. Use Value: Limits peak voltage to ≤196 V, preventing overvoltage failure of primary-side MOSFETs and controller ICs rated for 200 V drain-source. | Use Scenario: Protection of 400 V DC-link input in bidirectional OBC modules exposed to 12 V system transients and load dump. IC Role / Device Role / Timing Role: Standoff-rated TVS on low-voltage control logic supply (e.g., 12 V auxiliary rail) to absorb ISO 7637-2 Pulse 2b (load dump) energy. Use Value: Withstands 400 W surge without degradation, maintaining <1.6 µA leakage to avoid quiescent current impact on battery monitoring circuits. |
| Industrial DC/DC Converter | LED Driver Power Input |
Use Scenario: Input protection for isolated 24 V–48 V DC/DC modules used in PLC backplanes and sensor hubs. IC Role / Device Role / Timing Role: Primary-side TVS on VIN pin to suppress coupling from adjacent switching nodes and relay coil flyback. Use Value: Fast <1 ps response prevents latch-up in synchronous rectifier controllers; DO-214AC footprint enables automated placement alongside other SMT power components. | Use Scenario: Surge suppression on constant-current LED driver input in streetlight and tunnel lighting fixtures. IC Role / Device Role / Timing Role: Unidirectional clamping device between AC/DC output and LED string input to protect driver ICs from lightning-induced surges. Use Value: 150°C max junction temperature allows operation inside thermally constrained outdoor enclosures; UL 94V-0 molding compound resists flame propagation in high-density PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ110A | Narrower VBR range (122–135 V vs. 122–149 V); tighter tolerance improves clamping consistency but reduces margin for VBR drift at high temperature. | Better suited for precision-clamp designs where worst-case VC must stay below 177 V; less margin for aging or thermal derating. | Select SMAJ110A if design requires guaranteed VC ≤177 V at 1.7 A; otherwise SMAJ110 offers broader robustness across temperature and lot variation. |
| SMBJ110 | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W peak power rating (vs. 400 W) due to higher thermal mass. | Preferred for higher-energy surge environments (e.g., industrial mains input) where 600 W capability and lower thermal resistance are critical. | Choose SMBJ110 when board layout permits larger footprint and system-level testing demands >400 W surge handling; SMAJ110 remains optimal for space-constrained DC/DC and automotive modules. |
Compared with SMAJ110A, the SMAJ110 provides wider VBR tolerance for greater production yield and thermal margin, while SMBJ110 trades compact DO-214AC size for higher 600 W surge capacity and lower thermal resistance-making it suitable for higher-power, less space-constrained applications.
Availability
SMAJ110 is available at Aetrix Electronics and suitable for switching mode power supplies, automotive on-board chargers, and industrial DC/DC converters requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ110 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, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMAJ series is part of TSC's transient suppression portfolio, engineered specifically for automotive-grade reliability, ISO 7637-2 compliance, and high-volume surface-mount manufacturability in DO-214AC packaging.
FAQ
What is the maximum clamping voltage of SMAJ110 under standard test conditions?
The SMAJ110 has a maximum clamping voltage (VC) of 196 V when subjected to a 10/1000 µs peak impulse current of 1.6 A. This value is measured per JEDEC standards and reflects worst-case clamping performance at TA = 25°C; actual VC may increase slightly at elevated junction temperatures due to positive TC of avalanche voltage.
Is SMAJ110 suitable for bidirectional transient suppression?
No, SMAJ110 is a unidirectional TVS diode and is not rated for bidirectional operation. For bidirectional applications, the SMAJ110C or SMAJ110CA variants (with 'C' or 'CA' suffix) must be used, as they feature symmetrical breakdown characteristics in both polarities per the datasheet's bipolar section.
What is the reverse leakage current specification for SMAJ110 at its working stand-off voltage?
The SMAJ110 exhibits a maximum reverse leakage current (IR) of 1.6 µA when biased at its 110 V working stand-off voltage (VWM) and tested at TA = 25°C. This ultra-low leakage ensures minimal power loss in standby modes and compatibility with high-impedance sensing circuits.
Does SMAJ110 meet automotive transient immunity standards?
Yes, SMAJ110 meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (load dump), and Pulses 3a/3b (capacitive coupling and supply line noise), making it qualified for use in automotive power electronics including body control modules and infotainment power supplies.
What is the package type and lead finish of SMAJ110?
SMAJ110 is housed in a DO-214AC (SMA) surface-mount package with matte tin-plated leads that comply with J-STD-002 solderability requirements. The cathode is marked by a band on the package body, and the device has a moisture sensitivity level (MSL) of Level 1 per J-STD-020.
SMAJ110 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):
- 110V
- Voltage - Breakdown (Min):
- 122V
- Voltage - Clamping (Max) @ Ipp:
- 196V
- Current - Peak Pulse (10/1000µs):
- 1.6A
- 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)
SMAJ110 FAQ
1.How can I place an order for SMAJ110 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ110 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 SMAJ110 reliable?
The price and inventory of SMAJ110 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ110 is usually 5 days.
3.What payment methods are accepted for SMAJ110?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ110 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ110?
SMAJ110 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ110 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 SMAJ110?
For technical support, including SMAJ110 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ110 requirements.
6.How does Aetrix verify that SMAJ110 is sourced from the original manufacturer or authorized distributors?
All SMAJ110 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 SMAJ110 meets industry standards.
7.What is the process for return or replacement of SMAJ110?
All SMAJ110 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ110, 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 SMAJ110 part is unused and in its original packaging.
Return procedure for SMAJ110:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ110 Tags
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