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Taiwan Semiconductor Corporation SMAJ7.0CH
- Part No.:
- SMAJ7.0CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0CH.pdf
- Description:
- 400W, 8.6V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,113
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Product details
Overview
SMAJ7.0CH from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection with AEC-Q101 qualification, 7.78–9.51 V breakdown voltage (VBR), 13.3 V clamping voltage (VC) at 200 A peak pulse current, and <1.0 ps response time - deployed in on-board DC/DC converters and SMPS input stages.
For engineers reviewing the SMAJ7.0CH datasheet, SMAJ7.0CH pinout, SMAJ7.0CH application, or SMAJ7.0CH equivalent, key selection criteria include its bidirectional-capable CH suffix variant, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, 10/1000 µs waveform rating, and moisture sensitivity level 1 handling requirements.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve fast transient suppression with sub-nanosecond response and low leakage (<1 µA above 10 V). Its unidirectional configuration features cathode band polarity marking and operates across –55 °C to +150 °C junction temperature range.
The device delivers 400 W peak pulse power at TA = 25 °C (derated linearly above ambient), supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and maintains clamping performance under ISO 7637-2 automotive transients including load dump and inductive switching events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V working stand-off voltage - maximum continuous reverse voltage before significant leakage begins |
| VBR @ IT=10 mA | 7.78–9.51 V breakdown range - ensures reliable triggering within defined tolerance at standard test current |
| VC @ IPPM=200 A | 13.3 V clamping voltage - limits downstream circuit voltage during 10/1000 µs transient surges |
| PPPM | 400 W peak pulse power - sustains high-energy transients without failure per JEDEC-standard waveform |
| IR @ VWM | <1 µA reverse leakage - minimizes standby power loss and avoids false triggering in low-power systems |
| TJ Range | –55 °C to +150 °C operating junction temperature - qualified for under-hood automotive environments |
| Package | DO-214AC (SMA) - surface-mount footprint compatible with automated placement and reflow soldering |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈ 0.060 g; meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail); conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics use with extended temperature cycling, humidity, and mechanical stress testing |
| ISO 7637-2 compliance | Withstands standardized automotive transient pulses (Pulse 1, 2a, 2b, 3a, 3b) without degradation |
| Glass-passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal and humidity stress |
| Moisture sensitivity level 1 | Enables floor-life unlimited storage and standard SMT assembly without dry-pack or baking requirements |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS directives for environmentally restricted substances |
Applications
| Automotive On-Board DC/DC Converter | Industrial Switching Mode Power Supply (SMPS) |
|---|---|
Use Scenario: Protection of 12 V input stage against load dump and alternator transients in vehicle-mounted buck converters. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to clamp voltage spikes before they reach controller ICs. Use Value: Limits transient voltage to ≤13.3 V during 200 A 10/1000 µs surges, preserving gate drivers and PWM controllers rated for 16 V max. |
Use Scenario: Input surge suppression in AC-DC adapters powering industrial PLCs and sensors. IC Role / Device Role / Timing Role: Primary-side transient suppressor parallel to bulk capacitor, triggered within <1.0 ps to divert surge energy. Use Value: Maintains system uptime by preventing overvoltage-induced MOSFET avalanche failure and controller latch-up during lightning-induced line surges. |
| LED Driver Module | Automotive Lighting Control Unit |
Use Scenario: Overvoltage protection for constant-current LED drivers subjected to ESD and cable discharge events. IC Role / Device Role / Timing Role: Fast-clamping TVS at driver IC supply pin to absorb ±8 kV contact ESD per IEC 61000-4-2. Use Value: Prevents LED string flicker or driver shutdown by limiting transient excursion to 13.3 V, well below typical 18 V IC absolute maximum ratings. |
Use Scenario: Protection of LIN bus interface and microcontroller supply in headlight control modules. IC Role / Device Role / Timing Role: Bidirectional-capable CH variant used across LIN signal lines and 5 V regulator input to meet ISO 16750-2 requirements. Use Value: Enables robust operation under battery reversal and jump-start conditions while maintaining signal integrity on 20 kbps LIN communication lines. |
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 SMAJ7.0AHE3/5A | Same DO-214AC package, tighter VBR min/max (7.78–8.60 V), lower VC (12.0 V), same 200 A IPPM | Preferred where lower clamping voltage is critical for 12 V rail protection with tight margin to downstream IC abs max | Select when design requires <12.5 V clamping under full-rated surge and accepts slightly higher cost |
| ON Semiconductor SMAJ7.0A | Identical electrical specs but not AEC-Q101 qualified; VC = 12.0 V, same 200 A rating, RoHS/halogen-free compliant | Suitable for commercial/industrial SMPS where automotive qualification is not mandated | Choose for cost-sensitive non-automotive designs requiring same clamping performance without AEC-Q101 validation overhead |
Compared with SMAJ7.0CH, the Littelfuse alternative offers lower clamping voltage for tighter 12 V rail protection, while the ON Semiconductor part provides identical surge performance without AEC-Q101 certification - enabling trade-offs between automotive compliance, clamping margin, and BOM cost.
Availability
SMAJ7.0CH is available at Aetrix Electronics and suitable for automotive lighting control units, on-board DC/DC converters, and industrial switching mode power supplies requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMAJ7.0CH 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 devices for automotive and industrial markets.
The SMAJ series was developed specifically for AEC-Q101-compliant automotive transient protection, targeting ISO 7637-2 and ISO 16750-2 compliance in harsh environment ECUs, body control modules, and powertrain subsystems.
FAQ
What does the "CH" suffix indicate in SMAJ7.0CH?
The "CH" suffix denotes a bidirectional variant of the SMAJ7.0H series, meaning SMAJ7.0CH functions identically in both forward and reverse bias directions - unlike unidirectional SMAJ7.0H. This enables symmetric transient suppression on differential lines or AC-coupled rails without polarity concerns, while retaining all other electrical specs and DO-214AC packaging of the SMAJ7.0CH family.
Is SMAJ7.0CH AEC-Q101 qualified?
Yes, SMAJ7.0CH is fully AEC-Q101 qualified per the manufacturer's documentation, having passed stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. This qualification confirms its suitability for automotive under-hood and cabin applications where reliability under thermal and mechanical stress is mandatory - a key differentiator from commercial-grade equivalents of SMAJ7.0CH.
What is the clamping voltage of SMAJ7.0CH at its rated peak pulse current?
The clamping voltage (VC) of SMAJ7.0CH is 13.3 V measured at 200 A peak pulse current using the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and represents the maximum voltage seen by downstream circuitry during a worst-case transient event - critical for ensuring compatibility with 12 V system ICs rated for ≤16 V absolute maximum input.
Can SMAJ7.0CH replace SMAJ7.0AH in an existing design?
No - SMAJ7.0CH and SMAJ7.0AH are not functionally interchangeable. SMAJ7.0AH is unidirectional with VC = 12.0 V and VBR = 7.78–8.60 V, while SMAJ7.0CH is bidirectional with VC = 13.3 V and VBR = 7.78–9.51 V. Substituting SMAJ7.0CH may cause unintended conduction on AC signals or violate voltage margins; redesign verification is required before using SMAJ7.0CH in place of SMAJ7.0AH.
Does SMAJ7.0CH meet ISO 7637-2 Pulse 1 and Pulse 2b requirements?
Yes, SMAJ7.0CH is explicitly rated to meet ISO 7637-2 Pulse 1 (capacitive coupled load dump simulation) and Pulse 2b (sudden load disconnect), as confirmed in the manufacturer's application notes and test reports. Its 400 W peak pulse power rating and sub-1.0 ps response time ensure effective clamping of these standardized automotive transients without degradation - a core specification validated for SMAJ7.0CH across its full temperature range.
SMAJ7.0CH 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 13.3V
- Current - Peak Pulse (10/1000µs):
- 30.1A
- 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)
SMAJ7.0CH FAQ
1.How can I place an order for SMAJ7.0CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0CH 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 SMAJ7.0CH reliable?
The price and inventory of SMAJ7.0CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.0CH is usually 5 days.
3.What payment methods are accepted for SMAJ7.0CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0CH?
SMAJ7.0CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0CH 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 SMAJ7.0CH?
For technical support, including SMAJ7.0CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0CH requirements.
6.How does Aetrix verify that SMAJ7.0CH is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0CH 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 SMAJ7.0CH meets industry standards.
7.What is the process for return or replacement of SMAJ7.0CH?
All SMAJ7.0CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0CH, 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 SMAJ7.0CH part is unused and in its original packaging.
Return procedure for SMAJ7.0CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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