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Taiwan Semiconductor Corporation SMAJ11CH
- Part No.:
- SMAJ11CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11CH.pdf
- Description:
- TVS DIODE 11VWM 20.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,586
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Product details
Overview
SMAJ11CH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 11V working stand-off voltage (VWM), 12.2–14.9V breakdown voltage (VBR), and 20.1V clamping voltage (VC) at 19.9A peak pulse current. It delivers fast response (<1.0ps), low leakage (<1µA @ VWM), and AEC-Q101 qualification for automotive-grade surge protection in DC/DC converters and power supplies.
For engineers reviewing the SMAJ11CH datasheet, SMAJ11CH pinout, SMAJ11CH application, or SMAJ11CH equivalent, this page provides verified electrical parameters, bidirectional capability context (CH suffix indicates unidirectional), ISO 7637-2 compliance details, and real-world design implications for overvoltage protection in 12V automotive subsystems and industrial SMPS rails.
Technical Context
The SMAJ11CH employs a glass-passivated silicon junction optimized for high-energy transient suppression under 10/1000µs waveform conditions. Its clamping behavior is defined by a single-die unidirectional structure with cathode band polarity marking and a maximum junction temperature of +150°C.
It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electronics and supports steady-state power dissipation up to 1W. The device operates across –55°C to +150°C and exhibits <3.5V forward voltage at 25A surge current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 12V nominal rail. |
| VBR min/max | 12.2 V / 14.9 V - Breakdown initiates within this range at 1mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 20.1 V - Clamped voltage at 19.9A peak pulse (10/1000µs); limits downstream IC stress during load dump events. |
| PPPM | 400 W - Peak pulse power rating at TA = 25°C; derates linearly above ambient per Fig.2. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; negligible power loss and signal integrity impact. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, matte tin-plated leads, moisture sensitivity level 1 (J-STD-020), UL 94V-0 molding compound, 0.060g weight. Cathode band denotes terminal polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage return path; defines clamping direction toward GND. |
| Cathode | Protected line input | Connected to the line being protected (e.g., 12V rail); conducts surge current to Anode when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| Fast response time | <1.0 ps rise-time from 0 V to VBR min - intercepts ESD and lightning-induced transients before sensitive circuitry reacts. |
| ISO 7637-2 compliance | Passes Pulse 1 (inductive switch-off), Pulse 2a (battery disconnect), Pulse 2b (alternator load dump), and Pulses 3a/3b (capacitive coupling) - full automotive EMC robustness. |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and VC under thermal cycling and humidity exposure. |
Applications
| Automotive Body Control Module (BCM) | Industrial 12V DC/DC Converter |
|---|---|
Use Scenario: Protects LIN bus interface and microcontroller I/O pins from load dump and jump-start surges in door modules and lighting controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN line and ground, clamping transients to ≤20.1V to prevent MCU reset or latch-up. Use Value: Enables reliable operation under ISO 7637-2 Pulse 2b (load dump up to 120V/100ms) without derating or additional series impedance. |
Use Scenario: Shields primary-side gate driver and feedback optocoupler inputs in isolated flyback converters powering PLC I/O cards. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12V bias rail absorbs switching noise and transformer leakage spikes before they couple into control logic. Use Value: Maintains stable 12V rail regulation during 400W transient events with <1µA leakage-no impact on quiescent current budget. |
| LED Driver Power Input Stage | Telecom Power Adapter Protection |
Use Scenario: Guards constant-current LED driver ICs against inrush and hot-swap transients in streetlight and signage systems. IC Role / Device Role / Timing Role: Placed upstream of input capacitor on 12V/24V input rail; clamps to 20.1V to avoid overvoltage shutdown of buck controller. Use Value: Withstands repeated 10/1000µs pulses up to 19.9A without parameter shift-critical for outdoor equipment lifetime. |
Use Scenario: Secures secondary-side 12V output of AC/DC adapters used in PoE-powered network switches and IP cameras. IC Role / Device Role / Timing Role: Output-rail TVS absorbing EFT bursts and capacitive coupling noise from Ethernet magnetics or nearby relays. Use Value: Low 20.1V clamping voltage prevents brownout of 12V LDOs while maintaining RoHS/halogen-free compliance for global market access. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A | Lower VBR range (12.2–13.5V vs. 12.2–14.9V); tighter tolerance but reduced margin for high-temp drift. | Better suited for precision 12V rail clamping where worst-case VBR must stay below 13.5V at +125°C. | Select SMAJ11A if system-level testing confirms VBR upper limit must not exceed 13.5V under full temp range. |
| SMBJ11CH | Same electrical specs but SMB (DO-214AA) package - 2.5mm wider body, higher thermal mass, 1.5× PCB footprint. | Preferred where board space allows and higher thermal dissipation is needed for repetitive surge duty cycles. | Choose SMBJ11CH only if layout permits larger pad area and thermal relief is required beyond SMAJ11CH's 400W single-pulse rating. |
Compared with SMAJ11CH, SMAJ11A offers tighter VBR control at cost of reduced high-temperature margin, while SMBJ11CH trades compactness for enhanced thermal handling-neither is pin-compatible due to differing package outlines and thermal pad requirements.
Availability
SMAJ11CH is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, and LED driver power input stages requiring stable component supply with AEC-Q101 assurance and ISO 7637-2 compliance.
Supply support for SMAJ11CH 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 automotive-qualified components.
The SMAJ series was designed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust glass-passivated junction construction.
FAQ
What does the "CH" suffix indicate in SMAJ11CH?
The "CH" suffix in SMAJ11CH denotes a unidirectional TVS diode with cathode-band polarity marking and standard DO-214AC (SMA) packaging. Unlike "CAH" variants, SMAJ11CH is not bidirectional-it clamps only when cathode voltage exceeds anode by ≥VBR. This configuration is optimal for protecting grounded lines such as 12V rails or LIN bus signals, and is explicitly validated for ISO 7637-2 Pulse 2b load dump events.
Is SMAJ11CH compliant with AEC-Q101 and RoHS?
Yes, SMAJ11CH is fully AEC-Q101 qualified and RoHS compliant, with halogen-free construction per IEC 61249-2-21. Its qualification includes high-temperature operating life (HTOL), unbiased highly accelerated stress test (uHAST), and temperature cycling-ensuring reliability in automotive under-hood environments. The device also meets J-STD-020 moisture sensitivity level 1, eliminating bake requirements prior to reflow.
What is the clamping voltage of SMAJ11CH under a 10/1000µs surge?
The clamping voltage (VC) of SMAJ11CH is 20.1 V at 19.9 A peak pulse current under the standardized 10/1000µs waveform. This value is measured per Figure 5 in the official datasheet and represents the maximum voltage imposed on the protected line during worst-case transient events. It ensures downstream 12V-rated ICs remain within absolute maximum ratings even during 400W surges.
Can SMAJ11CH be used in bidirectional signal lines like CAN or USB?
No, SMAJ11CH is unidirectional and unsuitable for bidirectional data lines such as CAN or USB. Its asymmetrical conduction-clamping only in reverse bias-would short the signal during normal differential swing. For bidirectional protection, TSC specifies "CAH" suffix variants (e.g., SMAJ11CAH), which use dual-die back-to-back configuration and symmetric clamping in both directions.
How does SMAJ11CH compare to SMAJ11AH in terms of breakdown voltage?
SMAJ11CH has a VBR range of 12.2–14.9 V at 1 mA test current, whereas SMAJ11AH specifies 12.2–13.5 V. The broader VBR window of SMAJ11CH accommodates wider process variation and higher-temperature operation, making it more robust in automotive environments where junction temperatures routinely exceed 100°C. Both share identical VWM (11 V), VC (20.1 V), and PPPM (400 W).
SMAJ11CH 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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 20.1V
- Current - Peak Pulse (10/1000µs):
- 19.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ11CH FAQ
1.How can I place an order for SMAJ11CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11CH 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 SMAJ11CH reliable?
The price and inventory of SMAJ11CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11CH is usually 5 days.
3.What payment methods are accepted for SMAJ11CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11CH?
SMAJ11CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11CH 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 SMAJ11CH?
For technical support, including SMAJ11CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11CH requirements.
6.How does Aetrix verify that SMAJ11CH is sourced from the original manufacturer or authorized distributors?
All SMAJ11CH 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 SMAJ11CH meets industry standards.
7.What is the process for return or replacement of SMAJ11CH?
All SMAJ11CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11CH, 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 SMAJ11CH part is unused and in its original packaging.
Return procedure for SMAJ11CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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