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Taiwan Semiconductor Corporation SMAJ100C
- Part No.:
- SMAJ100C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ100C.pdf
- Description:
- 300W, 123.5V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,495
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Product details
Overview
SMAJ100C from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 100V working stand-off voltage (VWM), 111–136V breakdown voltage (VBR) at 1mA test current, and clamps to ≤179V at 1.7A peak impulse current under 10/1000μs waveform - used in automotive power modules and industrial SMPS input stages.
For engineers reviewing the SMAJ100C datasheet, SMAJ100C pinout, SMAJ100C application, or SMAJ100C equivalent, key selection criteria include clamping voltage margin vs. protected IC VMAX, leakage current (<1μA @ 100V), ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and DO-214AC thermal derating above 25°C.
Technical Context
The SMAJ100C operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-1ps response from 0V to VBR min. Its single-die construction and DO-214AC package support automated placement and meet JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
It delivers 400W peak pulse power (10/1000μs) at 25°C, derated linearly above ambient temperature per Fig.2, and sustains 40A non-repetitive forward surge (8.3ms half-sine) while maintaining <3.5V forward voltage at 25A - critical for high-energy transient suppression in 24V/48V industrial bus systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100 V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 111 / 136 V @ 1 mA - ensures reliable avalanche initiation within defined tolerance band |
| VC @ IPPM | ≤179 V @ 1.7 A - clamping voltage limits downstream component stress during transients |
| PPPM | 400 W (10/1000μs) - peak energy absorption capacity for standardized surge testing |
| IR @ VWM | ≤1 μA - ultra-low leakage preserves efficiency in high-impedance bias networks |
| TJ max | +150 °C - enables operation in under-hood automotive and enclosed industrial enclosures |
| Package | DO-214AC (SMA) - surface-mount footprint compatible with IPC-7351B standard pad layout |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode indicated by band marking; polarity-critical for unidirectional operation; weight ≈0.060g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage rail; defines conduction path during reverse transient |
| Cathode | High-side transient clamp node | Connected to protected line (e.g., 100V DC bus); carries full surge current during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surges |
| Sub-1ps response time | Ensures clamping activation before sensitive downstream circuitry experiences overvoltage damage |
| ISO 7637-2 compliance | Validated for automotive load dump (Pulse 2b), supply interruption (Pulse 3b), and coupled transients |
| J-STD-020 Level 1 moisture sensitivity | Permits unlimited floor life and standard reflow without baking preconditioning |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Power Module Protection | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting gate drivers and MCU power rails in 48V mild-hybrid vehicle DC/DC converters against load dump pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between input bus and ground, activated within <1ps of overvoltage onset. Use Value: Limits transient voltage to ≤179V, preserving 200V-rated MOSFETs and 5V logic supplies downstream. | Use Scenario: Safeguarding primary-side controller ICs in telecom-grade 36–75V input AC/DC adapters exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-clamp protector on bulk capacitor input node, absorbing up to 400W per 10/1000μs event. Use Value: Maintains <1μA leakage at 100V, minimizing standby power loss while meeting IEC 61000-4-5 Level 4 immunity. |
| On-Board DC/DC Converter | LED Driver Power Input |
Use Scenario: Shielding isolated buck-boost controllers in railway signaling equipment from ESD and switching noise coupling. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp on secondary-side 24V output rail, referenced to local ground plane. Use Value: Clamps 1.7A impulse within 10/1000μs window, preventing latch-up in 3.3V microcontrollers powered via LDO. | Use Scenario: Guarding constant-current LED driver ICs in streetlight systems against grid-switching transients on 100V DC distribution lines. IC Role / Device Role / Timing Role: Primary overvoltage limiter on high-side input, conducting only during >111V excursions. Use Value: Delivers 400W pulse rating with ≤179V clamping, ensuring LED string integrity during 1kV/μs fast-rising events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ100A | Narrower VBR range (111–123V) and lower clamping voltage (≤162V @ 1.9A) | Better suited for tighter voltage-margin designs where 17V clamping headroom is insufficient | Select SMAJ100A when downstream components tolerate ≤162V transient exposure and tighter VBR consistency is required |
| SMBJ100C | Same VWM/VBR specs but in larger DO-214AA (SMB) package; 600W PPPM rating | Higher power handling supports longer-duration transients; requires larger PCB footprint | Choose SMBJ100C when system-level surge testing exceeds 400W or thermal mass demands greater dissipation |
Compared with SMAJ100C, SMAJ100A offers tighter VBR tolerance and lower VC for precision-clamp designs, while SMBJ100C provides higher pulse power and thermal mass at the cost of board space - both require validation of mechanical fit and layout clearance.
Availability
SMAJ100C is available at Aetrix Electronics and suitable for automotive power modules, industrial SMPS input stages, and on-board DC/DC converters requiring stable component supply across extended temperature ranges and high-reliability surge environments.
Supply support for SMAJ100C 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, and power MOSFETs since 1979.
The SMAJ series is engineered specifically for high-energy transient suppression in automotive and industrial power systems, emphasizing ISO 7637-2 compliance, low leakage, and robust DO-214AC packaging for automated assembly.
FAQ
What is the clamping voltage of SMAJ100C under standard 10/1000μs surge conditions?
The SMAJ100C clamps to a maximum of 179 V when subjected to its rated peak impulse current of 1.7 A under the standardized 10/1000μs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during transient events - a critical parameter for ensuring compatibility with downstream component voltage ratings.
Is SMAJ100C suitable for bidirectional transient protection?
No, SMAJ100C is a unidirectional TVS diode intended for DC line protection with defined anode-cathode polarity. For bidirectional applications, the SMAJ100CA variant must be used - it features symmetrical breakdown in both directions and is marked with a "C" suffix to indicate bidirectional capability.
What is the maximum steady-state power dissipation rating for SMAJ100C?
The SMAJ100C has a steady-state power dissipation (PD) rating of 1 W at TA = 25°C. This value applies only to continuous DC or low-frequency reverse-bias conditions - transient suppression relies on its 400W peak pulse power rating (10/1000μs), not steady-state thermal limits.
Does SMAJ100C comply with automotive electromagnetic compatibility standards?
Yes, SMAJ100C meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (battery feed interruption), Pulse 2b (alternator load dump), Pulse 3a (capacitive coupled fast transients), and Pulse 3b (inductive coupled fast transients), making it qualified for use in automotive power network protection.
What is the moisture sensitivity level (MSL) and reflow profile guidance for SMAJ100C?
SMAJ100C is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and may be subjected to standard lead-free reflow profiles (peak ≤260°C) without preconditioning bake. Its DO-214AC package uses UL 94V-0 molding compound and passes JESD201 Class 2 whisker testing.
SMAJ100C 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):
- 100V
- Voltage - Breakdown (Min):
- 111V
- Voltage - Clamping (Max) @ Ipp:
- 179V
- Current - Peak Pulse (10/1000µs):
- 1.7A
- 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)
SMAJ100C FAQ
1.How can I place an order for SMAJ100C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ100C 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 SMAJ100C reliable?
The price and inventory of SMAJ100C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ100C is usually 5 days.
3.What payment methods are accepted for SMAJ100C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ100C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ100C?
SMAJ100C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ100C 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 SMAJ100C?
For technical support, including SMAJ100C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ100C requirements.
6.How does Aetrix verify that SMAJ100C is sourced from the original manufacturer or authorized distributors?
All SMAJ100C 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 SMAJ100C meets industry standards.
7.What is the process for return or replacement of SMAJ100C?
All SMAJ100C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ100C, 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 SMAJ100C part is unused and in its original packaging.
Return procedure for SMAJ100C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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