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Taiwan Semiconductor Corporation SMAJ6.5CAH
- Part No.:
- SMAJ6.5CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.5CAH.pdf
- Description:
- 400W, 7.6V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,520
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Product details
Overview
SMAJ6.5CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade surge protection with AEC-Q101 qualification, 11.2V clamping voltage at 500A peak pulse current, and 7.22–7.98V breakdown voltage. It protects DC/DC converters, lighting systems, and SMPS inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ6.5CAH datasheet, SMAJ6.5CAH pinout, SMAJ6.5CAH application, or SMAJ6.5CAH equivalent, key selection criteria include bidirectional clamping performance, 10/1000μs waveform compliance, junction temperature range (−55°C to +150°C), and moisture sensitivity level 1 handling - all critical for automotive and industrial power rail protection design.
Technical Context
The SMAJ6.5CAH implements a glass-passivated silicon junction optimized for fast transient response (<1.0ps rise time from 0 V to VBR min) and low leakage (<6.5 μA at 10 V). Its bidirectional configuration enables symmetrical clamping across both polarities without external polarity management.
It operates within a −55°C to +150°C junction temperature range, supports 40 A peak forward surge current (8.3 ms half-sine), and maintains stable clamping under derated conditions per Fig.2 - enabling reliable use in under-hood automotive environments and high-temperature industrial power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 7.22 V / 7.98 V at 10 mA test current - defines minimum and maximum voltage at which device enters avalanche conduction |
| VWM | 10 V working stand-off voltage - maximum continuous reverse voltage before significant leakage begins |
| VC @ IPPM | 11.2 V clamping voltage at 500 A peak impulse - limits transient voltage seen by downstream circuitry |
| PPPM | 400 W peak pulse power (10/1000 μs waveform) - energy-handling capacity for standardized surge events |
| IR @ VWM | ≤6.5 μA reverse leakage at 10 V - ensures minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C maximum junction temperature - supports operation in engine bay or enclosed power modules |
Pinout & Package
DO-214AC (SMA) surface-mount package with matte tin-plated leads, UL 94V-0 molding compound, and cathode band marking for polarity identification. Bidirectional construction means no functional anode/cathode distinction; terminals are symmetrically rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked end) | Transient return path (bidirectional) | Functions as cathode during positive transients and anode during negative transients - no fixed polarity |
| Cathode (band end) | Transient return path (bidirectional) | Functions as anode during positive transients and cathode during negative transients - identical rating to opposite terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, humidity bias, and mechanical shock per stress test requirements |
| Fast response time <1.0 ps | Enables clamping before sensitive ICs experience overvoltage - critical for protecting CAN/LIN bus interfaces and microcontrollers |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Complies with full suite of automotive supply-line transient immunity standards - eliminates need for additional filtering stages |
| Moisture sensitivity level 1 | Allows unlimited floor life and standard reflow without baking - simplifies SMT line integration and reduces manufacturing cost |
Applications
| Automotive Infotainment Power Rail | Industrial LED Driver Input Stage |
|---|---|
Use Scenario: Protecting 12 V supply input of head unit MCU and display controller from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to clamp both positive and negative transients. Use Value: 11.2 V clamping ensures MCU VCC stays below absolute maximum rating during 100 V/50 ms load dump events per ISO 7637-2 Pulse 5a. | Use Scenario: Safeguarding constant-current LED driver IC from switching surges generated by nearby relay coils and motor drivers. IC Role / Device Role / Timing Role: Transient shunt mounted across input capacitor to absorb 400 W pulses without degradation. Use Value: 400 W peak pulse rating handles repetitive 10/1000 μs surges common in factory automation lighting control cabinets. |
| On-board DC/DC Converter Protection | USB-C PD Adapter Secondary Side |
Use Scenario: Securing 5–24 V isolated DC/DC converter input against ESD and inductive kickback from adjacent buck regulators. IC Role / Device Role / Timing Role: Fast-clamping TVS placed between primary-side input and ground to limit voltage overshoot during startup and fault recovery. Use Value: ≤6.5 μA leakage at 10 V prevents measurable quiescent current increase in always-on power domains. | Use Scenario: Suppressing fast-rising transients on secondary-side 5–20 V output rails caused by hot-plug events and cable discharge. IC Role / Device Role / Timing Role: Bidirectional clamping device connected across output terminals to protect USB-C port controller and power delivery IC. Use Value: Symmetrical 7.22–7.98 V breakdown ensures consistent clamping regardless of transient polarity - essential for reversible USB-C interface robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.5AHE3/5BT | Same electrical specs; Vishay variant with identical DO-214AC package and AEC-Q101 qualification | No functional difference - validated for same ISO 7637-2 pulse profiles and automotive temperature range | Select when dual-sourcing required or preferred distributor carries Vishay line |
| P6SMB6.8CA | 6.8 V nominal VWM, 11.5 V VC @ 510 A, 600 W PPPM; larger DO-214AA package | Higher clamping voltage and power rating; requires PCB layout change due to larger footprint | Choose only if system demands >400 W surge margin or existing design uses SMB package |
Compared with SMAJ6.5CAH, SMAJ6.5AHE3/5BT offers identical protection performance with alternate supply chain access, while P6SMB6.8CA trades smaller size for higher clamping voltage and incompatible package - making it unsuitable for direct replacement without layout revision.
Availability
SMAJ6.5CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial LED drivers, and on-board DC/DC converters requiring stable component supply with AEC-Q101 assurance and ISO 7637-2 compliance.
Supply support for SMAJ6.5CAH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in harsh-environment power rails - emphasizing fast response, low leakage, and robust thermal performance in compact surface-mount packages.
FAQ
What does the "CAH" suffix indicate in SMAJ6.5CAH?
The "CAH" suffix denotes a bidirectional configuration with AEC-Q101 qualification and high-reliability packaging. Unlike unidirectional "H" variants, SMAJ6.5CAH provides symmetrical clamping for both positive and negative transients without polarity constraints - confirmed in the datasheet's "Devices for Bipolar Applications" section and electrical specifications table.
Is SMAJ6.5CAH compatible with lead-free reflow processes?
Yes, SMAJ6.5CAH uses matte tin-plated leads compliant with J-STD-002 solderability standards and meets RoHS and halogen-free requirements per IEC 61249-2-21. Its DO-214AC package is rated for standard Pb-free reflow profiles up to 260°C peak, with moisture sensitivity level 1 allowing unlimited floor life without baking.
What is the maximum clamping voltage of SMAJ6.5CAH under surge conditions?
The maximum clamping voltage of SMAJ6.5CAH is 11.2 V at 500 A peak impulse current with a 10/1000 μs waveform, as specified in the Electrical Specifications table. This value is measured under non-repetitive conditions and remains stable across the full operating junction temperature range of −55°C to +150°C.
Does SMAJ6.5CAH meet ISO 7637-2 Pulse 5a (load dump)?
No - SMAJ6.5CAH meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b, but not Pulse 5a (load dump), which requires higher voltage clamping capability and energy handling beyond its 400 W rating. For Pulse 5a, higher-voltage variants like SMAJ150AH or dedicated load-dump suppressors are required.
How does SMAJ6.5CAH differ from SMAJ6.5AH?
SMAJ6.5AH is unidirectional with cathode marking and asymmetric conduction, while SMAJ6.5CAH is bidirectional with no functional polarity - both share identical VBR, VWM, VC, and PPPM values. The "C" prefix explicitly indicates bidirectional capability, enabling use in AC-coupled or polarity-agnostic protection schemes where SMAJ6.5AH would require external diode pairing.
SMAJ6.5CAH 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):
- 6.5V
- Voltage - Breakdown (Min):
- 7.22V
- Voltage - Clamping (Max) @ Ipp:
- 11.2V
- Current - Peak Pulse (10/1000µs):
- 35.7A
- 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)
SMAJ6.5CAH FAQ
1.How can I place an order for SMAJ6.5CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.5CAH 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 SMAJ6.5CAH reliable?
The price and inventory of SMAJ6.5CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ6.5CAH is usually 5 days.
3.What payment methods are accepted for SMAJ6.5CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.5CAH?
SMAJ6.5CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.5CAH 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 SMAJ6.5CAH?
For technical support, including SMAJ6.5CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5CAH requirements.
6.How does Aetrix verify that SMAJ6.5CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ6.5CAH 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 SMAJ6.5CAH meets industry standards.
7.What is the process for return or replacement of SMAJ6.5CAH?
All SMAJ6.5CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5CAH, 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 SMAJ6.5CAH part is unused and in its original packaging.
Return procedure for SMAJ6.5CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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