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Taiwan Semiconductor Corporation SMAJ6.5CA
- Part No.:
- SMAJ6.5CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.5CA.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,625
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Product details
Overview
SMAJ6.5CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping ESD and surge transients on power and signal lines. It features a 7.22 V minimum breakdown voltage, 12.3 V maximum clamping voltage at 500 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ6.5CA datasheet, SMAJ6.5CA pinout, SMAJ6.5CA application, or SMAJ6.5CA equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.7), compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and suitability for automotive and industrial DC power rail protection where fast response (<1 ps) and low leakage (<6.5 µA at 10 V) are required.
Technical Context
The SMAJ6.5CA implements a glass-passivated silicon avalanche junction optimized for unidirectional or bidirectional transient suppression. Its bidirectional configuration (denoted by "CA") enables symmetrical clamping in both polarities without external polarity management, supporting robust protection of floating or AC-coupled interfaces.
It delivers sub-nanosecond response to transients, with clamping initiated within <1.0 ps from 0 V to VBR min, and maintains stable performance across -55 °C to +150 °C junction temperature range. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability surface-mount applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min / max | 7.22 V / 8.82 V at 6.5 mA - defines reliable avalanche initiation threshold under standardized test conditions |
| VWM | 10 V - maximum continuous reverse working voltage before significant leakage begins |
| IR @ VWM | <6.5 µA - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| VC @ IPPM | 12.3 V at 500 A (10/1000 µs) - limits protected circuit voltage during worst-case surge events |
| PPPM | 400 W - peak surge energy handling capacity compatible with ISO 7637-2 automotive pulse tests |
| TJ max | +150 °C - supports operation in under-hood automotive and industrial environments without derating |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline enabling automated placement and reflow compatibility |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode band marking for unidirectional variants; SMAJ6.5CA is bidirectional and marked with "AH" code - no polarity-dependent terminal assignment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional distinction between terminals - either lead serves as clamping node for positive or negative transients |
| Cathode band (not present) | N/A - bidirectional construction | Eliminates need for orientation-aware PCB layout; simplifies routing and reduces assembly error risk |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and leakage under thermal cycling and humidity stress |
| Clamping ratio (VC/VBR) ≈ 1.7 | Minimizes overvoltage exposure during surge events while maintaining margin above VWM |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive battery line and load-dump transient immunity without external filtering |
| Moisture sensitivity level 1 (J-STD-020) | Enables standard SMT reflow without baking or special handling prior to assembly |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance requirements for automotive and industrial end equipment |
Applications
| Automotive Infotainment Power Rail | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs of head unit MCUs and display drivers against load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to limit rail voltage excursion. Use Value: Clamps to ≤12.3 V during 500 A surges, preventing latch-up or damage to downstream 12 V tolerant ICs while maintaining system uptime. | Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to inductive switching noise. IC Role / Device Role / Timing Role: Fast-acting shunt protector across input terminals to divert field-induced transients before reaching optocoupler or MCU GPIO. Use Value: Sub-1 ps response ensures clamping initiates before transient edge propagates into sensitive logic, reducing false triggering and component wear. |
| LED Driver Output Stage | DC/DC Converter Feedback Loop |
Use Scenario: Suppressing flyback spikes on constant-current LED string outputs in automotive lighting modules. IC Role / Device Role / Timing Role: Parallel-connected TVS across LED output to clamp inductive kickback from driver MOSFET turn-off. Use Value: 400 W peak power rating absorbs repetitive 10/1000 µs pulses without degradation, extending LED module lifetime. | Use Scenario: Protecting voltage feedback resistors and error amplifier inputs in isolated DC/DC converters from coupling transients. IC Role / Device Role / Timing Role: Low-leakage (≤6.5 µA) bidirectional clamp across FB pin and GND to prevent erroneous regulation during EFT bursts. Use Value: Maintains regulation accuracy under EMC stress by limiting FB node excursion without loading the high-impedance divider network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.5A (Taiwan Semiconductor) | Unidirectional; same VBR, VC, and PPPM, but requires correct polarity orientation during placement | Suitable only where circuit ground reference is fixed and transient polarity is known (e.g., single-rail DC supplies) | Select SMAJ6.5A when polarity is controlled and board space allows orientation-aware layout |
| SMBJ6.5CA (Bourns) | Same electrical specs and bidirectionality, but in larger DO-214AA (SMB) package (4.58 mm × 3.94 mm vs. SMA's 4.32 mm × 2.62 mm) | Higher thermal mass improves surge endurance in high-duty-cycle applications; requires revised pad layout | Choose SMBJ6.5CA for enhanced reliability in thermally demanding environments where footprint increase is acceptable |
Compared with SMAJ6.5A and SMBJ6.5CA, the SMAJ6.5CA offers polarity-agnostic placement in the smallest standard surface-mount TVS outline, balancing compactness, ease of assembly, and full bidirectional protection without compromising clamping performance or surge rating.
Availability
SMAJ6.5CA is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and LED lighting drivers requiring stable component supply and consistent surge immunity performance across production batches.
Supply support for SMAJ6.5CA 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 power management, protection, and signal conditioning devices.
The SMAJ series is engineered specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing fast response, repeatable clamping, and robust package integrity under thermal and mechanical stress.
FAQ
What does the "CA" suffix indicate in SMAJ6.5CA?
The "CA" suffix in SMAJ6.5CA denotes a bidirectional configuration - meaning the device provides symmetrical transient voltage clamping for both positive and negative polarity surges. Unlike unidirectional variants (e.g., SMAJ6.5A), SMAJ6.5CA has no anode/cathode distinction and functions identically regardless of voltage polarity applied across its terminals. This eliminates orientation constraints during PCB layout and assembly.
Is SMAJ6.5CA compliant with automotive transient standards?
Yes, SMAJ6.5CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupled noise), and Pulse 3b (inductive coupled noise). Its 400 W peak pulse power rating and sub-1 ps response time ensure robust immunity to real-world automotive transients without additional filtering components.
What is the maximum clamping voltage of SMAJ6.5CA under surge conditions?
The maximum clamping voltage (VC) of SMAJ6.5CA is 12.3 V when subjected to a 500 A peak impulse current with a 10/1000 µs waveform. This value is measured per JEDEC standards and represents the upper bound of voltage seen by protected circuitry during worst-case surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Can SMAJ6.5CA be used in place of SMAJ6.5A?
No - SMAJ6.5CA and SMAJ6.5A are not direct replacements due to fundamental configuration differences: SMAJ6.5CA is bidirectional, while SMAJ6.5A is unidirectional. Substituting SMAJ6.5CA for SMAJ6.5A introduces no polarity risk, but replacing SMAJ6.5CA with SMAJ6.5A requires verifying circuit grounding, transient polarity, and layout orientation. Always validate clamping behavior in-system before interchange.
What is the operating temperature range for SMAJ6.5CA?
SMAJ6.5CA is rated for junction temperatures from -55 °C to +150 °C, making it suitable for under-hood automotive, industrial control, and outdoor lighting applications. Its DO-214AC (SMA) package supports full-rated performance up to +150 °C without derating, and its moisture sensitivity level 1 (J-STD-020) allows standard reflow processing without pre-baking.
SMAJ6.5CA 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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ6.5CA FAQ
1.How can I place an order for SMAJ6.5CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.5CA 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 SMAJ6.5CA reliable?
The price and inventory of SMAJ6.5CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ6.5CA is usually 5 days.
3.What payment methods are accepted for SMAJ6.5CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.5CA?
SMAJ6.5CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.5CA 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 SMAJ6.5CA?
For technical support, including SMAJ6.5CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5CA requirements.
6.How does Aetrix verify that SMAJ6.5CA is sourced from the original manufacturer or authorized distributors?
All SMAJ6.5CA 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 SMAJ6.5CA meets industry standards.
7.What is the process for return or replacement of SMAJ6.5CA?
All SMAJ6.5CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5CA, 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 SMAJ6.5CA part is unused and in its original packaging.
Return procedure for SMAJ6.5CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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