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Taiwan Semiconductor Corporation SMAJ7.0AH
- Part No.:
- SMAJ7.0AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0AH.pdf
- Description:
- 400W, 8.2V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,622
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Product details
Overview
SMAJ7.0AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 7.78 V minimum breakdown voltage, 12.0 V maximum clamping voltage at 200 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - enabling reliable surge suppression in automotive and industrial power converters.
For engineers reviewing the SMAJ7.0AH datasheet, SMAJ7.0AH pinout, SMAJ7.0AH application, or SMAJ7.0AH equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AC (SMA) package compatibility with automated placement, low 7 µA max reverse leakage at 10 V working stand-off voltage, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance for automotive electronics.
Technical Context
The SMAJ7.0AH operates as a unidirectional avalanche diode with glass-passivated junction, delivering sub-1 ps response time from 0 V to VBR min. Its clamping behavior is defined by a 12.0 V maximum VC at IPPM = 200 A under 10/1000 µs waveform, with thermal derating above 25°C per Fig.2 and peak power limited to 400 W at TA = 25°C.
It supports unidirectional protection only (cathode band marked), exhibits 3.5 V max forward voltage at 25 A, and maintains operation across -55°C to +150°C junction temperature range. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for its DO-214AC molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC rail margin. |
| VBR @ IT = 10 mA | 7.78–8.60 V - Breakdown voltage range confirming tight tolerance for precise overvoltage threshold setting. |
| VC @ IPPM = 200 A | 12.0 V - Clamping voltage during worst-case 10/1000 µs surge; determines protected circuit's maximum transient exposure. |
| IR @ VWM | ≤7 µA - Ultra-low reverse leakage ensures minimal standby power loss in battery-backed or low-power systems. |
| PPK | 400 W - Peak pulse power handling capability under standard 10/1000 µs waveform; validates suitability for ISO 7637-2 Pulse 5a surges. |
| TJ Range | -55°C to +150°C - Full automotive-grade junction temperature range supporting under-hood and industrial ambient conditions. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.060 g mass and matte tin-plated leads compliant with J-STD-002 solderability. |
Pinout & Package
DO-214AC (SMA) package: single-ended, polarized device with cathode band marking on one end. Matte tin-plated leads meet J-STD-002 solderability; polarity must be observed during PCB layout to ensure correct unidirectional clamping direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lower-potential node; forms current path during reverse-biased surge conduction. |
| Cathode (marked) | High-side surge input terminal | Connected to protected line (e.g., 12 V rail); conducts avalanche current to anode when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control units and body modules requiring high-reliability surge immunity. |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives, critical for harsh-environment deployment. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) test requirements. |
| Fast response time <1.0 ps | Ensures clamping activation before sensitive downstream ICs experience damaging overvoltage - essential for protecting CAN/LIN transceivers. |
| Moisture sensitivity level 1 | Eliminates need for dry-packaging or baking prior to reflow, simplifying SMT assembly and reducing manufacturing cost. |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and primary converter input. Use Value: Limits transient voltage to ≤12.0 V during 200 A surges, preventing damage to upstream PMICs and microcontrollers. |
Use Scenario: Safeguarding isolated DC/DC converter inputs in factory automation controllers exposed to inductive switching noise. IC Role / Device Role / Timing Role: Standoff protector on 24 V input stage, absorbing repetitive 10/1000 µs pulses up to 400 W peak. Use Value: Maintains system uptime by suppressing >100 V spikes without degradation, supported by 150°C max junction rating. |
| LED Driver Supply Line | USB-C Power Delivery Interface |
Use Scenario: Shielding constant-current LED drivers in outdoor lighting from lightning-induced surges on 24–48 V distribution lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on driver input, coordinated with secondary MOV or GDT stages. Use Value: Delivers 12.0 V clamping with <7 µA leakage at 10 V, minimizing standby power loss while meeting IEC 61000-4-5 Level 3. |
Use Scenario: Providing secondary-level surge protection on USB-C VBUS lines in portable medical devices after primary front-end filtering. IC Role / Device Role / Timing Role: Fast-acting unidirectional clamp between VBUS and ground, sized for 200 A short-duration events. Use Value: Enables compact layout with DO-214AC footprint and ensures no false triggering due to tight 7.78–8.60 V VBR window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0H | Wider VBR range (7.78–9.51 V) and higher clamping voltage (13.3 V at 200 A). | Less precise threshold control and higher protected-line stress during clamping. | Select SMAJ7.0H only if looser VBR tolerance and higher VC are acceptable for non-critical rails. |
| SMBJ7.0AH | Same VBR (7.78–8.60 V) but SMB package (DO-214AA); 600 W peak power rating. | Higher surge capacity but larger footprint and different thermal profile. | Choose SMBJ7.0AH when 600 W surge margin is required and board space allows DO-214AA layout. |
Compared with SMAJ7.0H and SMBJ7.0AH, the SMAJ7.0AH offers tighter VBR tolerance and optimized 400 W/12.0 V clamping for space-constrained automotive and industrial DC rails where precision and DO-214AC compatibility are prioritized.
Availability
SMAJ7.0AH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial DC/DC converter input stages, and LED driver supply lines requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ7.0AH 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, rectification, and power management devices.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in automotive power systems and industrial equipment, emphasizing fast response, low leakage, and robust package reliability.
FAQ
What is the clamping voltage of SMAJ7.0AH under standard surge conditions?
The SMAJ7.0AH has a maximum clamping voltage (VC) of 12.0 V when subjected to a 200 A peak impulse current with a 10/1000 µs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuits during transient events - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings. The SMAJ7.0AH consistently achieves this performance across its full operating temperature range.
Is SMAJ7.0AH suitable for bidirectional surge protection?
No, SMAJ7.0AH is a unidirectional TVS diode and must be used with correct polarity - cathode connected to the protected line, anode to ground. For bidirectional applications, TSC offers the SMAJ7.0AH's counterpart SMAJ7.0CAH (or SMAJ7.0CH), which provides symmetrical clamping in both directions. Using SMAJ7.0AH in reverse-biased configuration will not provide effective protection and may lead to device failure.
Does SMAJ7.0AH meet automotive qualification standards?
Yes, SMAJ7.0AH is AEC-Q101 qualified and tested for automotive-grade reliability, including temperature cycling, humidity bias, and mechanical shock. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for electrical disturbances in road vehicles - making it suitable for engine control units, body electronics, and ADAS power supplies where certified surge immunity is mandatory.
What is the maximum reverse leakage current for SMAJ7.0AH at its working voltage?
The SMAJ7.0AH specifies a maximum reverse leakage current (IR) of 7 µA at its 10 V working stand-off voltage (VWM). This ultra-low leakage ensures minimal power loss in always-on or battery-powered systems, such as telematics modules or sensor nodes, where quiescent current directly impacts battery life. The value is guaranteed across the full -55°C to +150°C junction temperature range.
How does SMAJ7.0AH differ from SMAJ7.0H in practical design terms?
The SMAJ7.0AH has a tighter breakdown voltage range (7.78–8.60 V) versus SMAJ7.0H (7.78–9.51 V), resulting in more predictable turn-on behavior and lower clamping voltage (12.0 V vs. 13.3 V at 200 A). This makes SMAJ7.0AH preferable for designs requiring precise overvoltage thresholds and reduced stress on protected components - especially in safety-critical or thermally constrained automotive applications where the SMAJ7.0AH delivers superior consistency.
SMAJ7.0AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 33.3A
- 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)
SMAJ7.0AH FAQ
1.How can I place an order for SMAJ7.0AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0AH 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 SMAJ7.0AH reliable?
The price and inventory of SMAJ7.0AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.0AH is usually 5 days.
3.What payment methods are accepted for SMAJ7.0AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0AH?
SMAJ7.0AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0AH 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 SMAJ7.0AH?
For technical support, including SMAJ7.0AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0AH requirements.
6.How does Aetrix verify that SMAJ7.0AH is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0AH 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 SMAJ7.0AH meets industry standards.
7.What is the process for return or replacement of SMAJ7.0AH?
All SMAJ7.0AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0AH, 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 SMAJ7.0AH part is unused and in its original packaging.
Return procedure for SMAJ7.0AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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