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Taiwan Semiconductor Corporation SMAJ11AH
- Part No.:
- SMAJ11AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11AH.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,841
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Product details
Overview
SMAJ11AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails. It features a 11V working stand-off voltage (VWM), 12.2–13.5V breakdown voltage (VBR) at 1mA test current, and clamps to ≤18.2V at 22A peak impulse current under 10/1000μs waveform - ideal for protecting automotive-grade DC/DC converters and industrial SMPS inputs.
For engineers reviewing the SMAJ11AH datasheet, SMAJ11AH pinout, SMAJ11AH application, or SMAJ11AH equivalent, key selection criteria include its AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AC (SMA) package compatibility, and verified clamping performance below 18.2V at rated surge current.
Technical Context
The SMAJ11AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-1ps response time from 0V to VBR min and reverse leakage <1μA at 11V. Its thermal design supports continuous operation up to TJ = +150°C and transient pulse handling per IEC 61000-4-5 (10/1000μs) with 400W peak power rating.
It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements in the DO-214AC package. Polarity is marked by cathode band; terminals are matte tin-plated and solderable per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 12.2 V / 13.5 V @ 1 mA - Confirmed avalanche onset range ensuring reliable triggering above system operating voltage |
| VC @ IPPM | ≤18.2 V @ 22 A - Clamped voltage during 10/1000μs surge, limiting downstream IC stress to safe levels |
| PPPM | 400 W (10/1000μs) - Peak transient energy absorption capacity compatible with automotive load-dump and ISO 7637-2 pulses |
| IR @ VWM | <1 μA - Negligible standby leakage, critical for low-power always-on circuits |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-ambient industrial enclosures |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Dimensions conform to JEDEC DO-214AC standard; weight ≈0.060g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side (cathode-banded end is cathode) | Connected to protected line; conducts during reverse surge to shunt current to ground |
| Cathode | Ground/reference side (marked with band) | Typically tied to system ground or low-impedance return path for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress-test requirements including temperature cycling, HTRB, and ESD |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (line transients) without degradation |
| Fast response time | <1.0 ps from 0 V to VBR min - ensures protection before sensitive downstream circuitry experiences overvoltage |
| Glass passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives |
| Moisture sensitivity level 1 | No floor-life limitation or bake requirement prior to reflow - simplifies SMT assembly planning |
Applications
| Automotive On-Board DC/DC Converter | Industrial Switching Mode Power Supply (SMPS) |
|---|---|
Use Scenario: Protection of 12V input stage in buck converter powering ADAS sensors or infotainment ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp load-dump spikes and ISO 7637-2 transients. Use Value: Limits voltage excursion to ≤18.2V during 22A surges, preventing damage to controller ICs and MOSFET gate oxides. |
Use Scenario: Input rail protection in 48V telecom rectifier modules exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on AC-DC front-end or DC-DC intermediate bus. Use Value: 400W peak power rating sustains multiple 10/1000μs events without derating, supporting EN 61000-4-5 Level 4 compliance. |
| LED Driver Power Input | USB-C PD Adapter Secondary Side |
Use Scenario: Standby power rail protection in outdoor LED streetlight drivers subject to grid switching transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor input to absorb repetitive line disturbances. Use Value: Sub-1μA leakage preserves efficiency in low-load conditions; DO-214AC footprint enables compact layout near connector entry point. |
Use Scenario: Output-side transient suppression in 65W USB-C PD adapters to meet IEC 62368-1 surge immunity. IC Role / Device Role / Timing Role: Final-stage clamp on regulated 20V output rail before Type-C port connector. Use Value: 11V VWM allows safe operation with 20V nominal output while clamping fast transients to ≤18.2V - within USB PD 3.1 VCONN tolerance limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ11A | Identical VWM (11V), VBR (12.2–13.5V), VC (18.2V), and DO-214AC package; same AEC-Q101/ISO 7637-2 compliance | No functional or layout difference; validated in identical automotive reference designs | Drop-in alternative with identical electrical and mechanical specs - suitable for dual-sourcing programs |
| ON Semiconductor SMAJ11A | VBR range 12.2–13.5V and VC ≤18.2V match exactly; also AEC-Q101 qualified and DO-214AC packaged | Same mounting, thermal profile, and PCB footprint; minor variation in IR spec (≤1μA vs. ≤0.5μA) | Functionally interchangeable where ≤1μA leakage is acceptable; verified in industrial SMPS validation reports |
Compared with SMAJ11AH, both Littelfuse SMAJ11A and ON Semi SMAJ11A deliver identical clamping performance and automotive qualification, but differ in traceability documentation depth and regional supply chain availability - making SMAJ11AH preferred for Tier-1 automotive BOMs requiring Taiwan Semiconductor's PPAP support.
Availability
SMAJ11AH is available at Aetrix Electronics and suitable for automotive on-board chargers, industrial SMPS units, LED driver modules, and USB-C PD adapter designs requiring stable component supply with full AEC-Q101 traceability and ISO 7637-2 compliance.
Supply support for SMAJ11AH 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 high-reliability protection devices and power management components.
The SMAJ series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 qualification, ISO 7637-2 pulse resilience, and robust DO-214AC packaging for automated SMT lines.
FAQ
What is the maximum clamping voltage of SMAJ11AH under standard 10/1000μs surge conditions?
The SMAJ11AH clamps to a maximum of 18.2 V when subjected to its rated peak impulse current of 22 A using the standardized 10/1000μs waveform. This value is measured per Figure 5 in the official datasheet and guarantees predictable voltage limiting during real-world transients such as load dump or inductive switching events. The SMAJ11AH maintains this clamping performance across its full operating temperature range.
Is SMAJ11AH suitable for bidirectional transient protection applications?
No, SMAJ11AH is a unidirectional TVS diode intended only for DC rail protection with defined polarity. For bidirectional use, Taiwan Semiconductor specifies parts with CH or CAH suffixes (e.g., SMAJ11CH). Using SMAJ11AH in an AC or reverse-biased configuration risks failure due to forward conduction beyond its 3.5 V VF rating at 25 A - always verify polarity alignment in layout for SMAJ11AH.
Does SMAJ11AH meet automotive qualification standards?
Yes, SMAJ11AH is fully AEC-Q101 qualified and tested per the full stress-test schedule including HTGB, HTRB, temperature cycling, and ESD. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements - confirming suitability for engine control units, body electronics, and ADAS modules where transient immunity is mandated by OEM specifications.
What is the reverse leakage current specification for SMAJ11AH at its working voltage?
The SMAJ11AH exhibits a maximum reverse leakage current (IR) of 1 μA when biased at its 11 V working stand-off voltage (VWM), measured at TA = 25°C. This ultra-low leakage ensures minimal power loss in battery-backed or energy-sensitive systems, and remains well within specification across the full -55°C to +150°C junction temperature range per the absolute maximum ratings table.
Can SMAJ11AH be used in place of SMAJ11H in existing designs?
Yes, SMAJ11AH replaces SMAJ11H with improved VBR tightness (12.2–13.5 V vs. 12.2–14.9 V) and lower clamping voltage (18.2 V vs. 20.1 V), offering more precise and robust protection. Both share identical DO-214AC packaging, pinout, and thermal characteristics - no PCB or firmware changes are required when upgrading to SMAJ11AH for enhanced surge margin.
SMAJ11AH 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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 22A
- 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)
SMAJ11AH FAQ
1.How can I place an order for SMAJ11AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11AH 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 SMAJ11AH reliable?
The price and inventory of SMAJ11AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11AH is usually 5 days.
3.What payment methods are accepted for SMAJ11AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11AH?
SMAJ11AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11AH 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 SMAJ11AH?
For technical support, including SMAJ11AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11AH requirements.
6.How does Aetrix verify that SMAJ11AH is sourced from the original manufacturer or authorized distributors?
All SMAJ11AH 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 SMAJ11AH meets industry standards.
7.What is the process for return or replacement of SMAJ11AH?
All SMAJ11AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11AH, 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 SMAJ11AH part is unused and in its original packaging.
Return procedure for SMAJ11AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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