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Taiwan Semiconductor Corporation SMAJ6.5AH
- Part No.:
- SMAJ6.5AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.5AH.pdf
- Description:
- 400W, 7.6V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,572
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Product details
Overview
SMAJ6.5AH 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 7.22 V minimum breakdown voltage, 11.2 V maximum clamping voltage at 500 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive body control modules and industrial SMPS input stages.
For engineers reviewing the SMAJ6.5AH datasheet, SMAJ6.5AH pinout, SMAJ6.5AH application, or SMAJ6.5AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification status, moisture sensitivity level (MSL 1), and DO-214AC package compatibility with automated SMT assembly.
Technical Context
The SMAJ6.5AH 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 10/1000 µs double-exponential pulse, with peak impulse current limited to 500 A and clamping voltage capped at 11.2 V under that stress condition.
Thermal design relies on a 150 °C maximum junction temperature and 1 W steady-state power dissipation. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, supporting reliable operation across -55 °C to +150 °C ambient and storage ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10 V - Maximum continuous reverse operating voltage before leakage exceeds 6.5 µA |
| VBR(min) | 7.22 V @ 10 mA - Minimum voltage at which avalanche conduction begins reliably |
| VC@IPPM | 11.2 V @ 500 A - Clamped voltage during worst-case 10/1000 µs surge, limiting downstream stress |
| PPPM | 400 W - Peak pulse power handling per single non-repetitive 10/1000 µs event |
| IR@VWM | ≤6.5 µA - Low leakage ensures minimal standby power loss in high-impedance circuits |
| TJ(max) | 150 °C - Enables placement near heat sources in compact power converters without derating |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads comply with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to protected circuit ground or low-side return path |
| Cathode | Avalanche conduction terminal / Clamping node | Connected to protected line (e.g., 12 V rail); clamps transients to ≤11.2 V |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and ESD |
| Clamping voltage ≤11.2 V @ 500 A | Ensures I/O and power ICs downstream remain within absolute maximum ratings during load dump events |
| Response time <1.0 ps | Activates before most fast-edge transients (e.g., relay bounce, inductive kick) propagate into sensitive circuitry |
| MSL Level 1 (per J-STD-020) | Zero floor life limitation - can be stored indefinitely at ≤30 °C/60% RH without baking prior to reflow |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated against full suite of automotive electrical disturbance waveforms for ECU-level immunity |
Applications
| Automotive Body Control Module (BCM) | Industrial Switching Mode Power Supply (SMPS) |
|---|---|
Use Scenario: Protects LIN bus transceivers and microcontroller I/O pins from battery line transients during load dump and jump-start conditions. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN line and ground, clamping surges to ≤11.2 V within picoseconds. Use Value: Prevents latch-up or permanent damage to 5 V tolerant transceivers while maintaining signal integrity during ISO 7637-2 Pulse 2a. |
Use Scenario: Shields primary-side controller ICs and gate drivers in 24 V input AC/DC adapters from switching noise and input surges. IC Role / Device Role / Timing Role: Mounted across bulk capacitor input, absorbing 400 W pulses without thermal runaway. Use Value: Enables use of cost-optimized controllers rated for 16 V max VDD, eliminating need for higher-voltage-rated (and more expensive) ICs. |
| LED Driver Input Stage | On-board DC/DC Converter Protection |
Use Scenario: Safeguards constant-current LED driver ICs in vehicle lighting systems exposed to alternator ripple and ignition noise. IC Role / Device Role / Timing Role: Placed at DC input of buck controller, conducting only during >10 V transients while remaining high-impedance otherwise. Use Value: Maintains <6.5 µA leakage at 10 V, avoiding false triggering or efficiency loss in always-on lighting modules. |
Use Scenario: Guards 5 V or 3.3 V point-of-load regulators in infotainment head units against back-EMF from motorized displays and fans. IC Role / Device Role / Timing Role: Connected between VIN and GND of DC/DC input filter, clamping spikes before LC stage. Use Value: Limits voltage excursion to 11.2 V, preventing regulator shutdown or internal FET avalanche failure during repetitive 500 A surges. |
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 SMAJ6.5A | Identical VBR (7.22–7.98 V), same DO-214AC package, but rated for 300 W above 78 V (SMAJ6.5AH maintains 400 W at all voltages) | Not AEC-Q101 qualified; intended for commercial/industrial use only | Select when automotive qualification is not required and cost optimization is prioritized |
| Vishay SMAJ6.5AHE3/5A | Same VBR, VC, and PPPM; RoHS/halogen-free compliant but MSL Level 2 (requires moisture bake before reflow) | Requires floor-life management and pre-reflow baking - adds process complexity in high-volume SMT lines | Select when supply chain prefers Vishay's logistics model and baking infrastructure is available |
Compared with Littelfuse SMAJ6.5A and Vishay SMAJ6.5AHE3/5A, the SMAJ6.5AH uniquely combines AEC-Q101 qualification, MSL Level 1 handling, and full 400 W rating across its entire voltage range - making it optimal for automotive Tier-1 production where zero process risk and guaranteed surge margin are mandatory.
Availability
SMAJ6.5AH is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and LED lighting systems requiring stable component supply with full AEC-Q101 traceability and MSL Level 1 handling.
Supply support for SMAJ6.5AH 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 MOSFETs for automotive and industrial markets.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing low clamping voltage, ultrafast response, and robust packaging for reflow-soldered ECUs.
FAQ
What is the maximum clamping voltage of the SMAJ6.5AH under standard test conditions?
The SMAJ6.5AH exhibits a maximum clamping voltage (VC) of 11.2 V when subjected to a 500 A peak impulse current with a 10/1000 µs waveform at TA = 25 °C. This value is measured per JEDEC standards and guarantees protection for downstream 12 V logic and power ICs without exceeding their absolute maximum ratings. The SMAJ6.5AH maintains this clamping performance across its full operating temperature range.
Is the SMAJ6.5AH suitable for bidirectional transient suppression?
No, the SMAJ6.5AH is a unidirectional TVS diode and must be used with correct polarity - cathode connected to the protected line, anode to ground. For bidirectional applications, Taiwan Semiconductor specifies devices with CH or CAH suffixes (e.g., SMAJ6.5CH). Using SMAJ6.5AH in reverse-biased configurations will not provide symmetrical clamping and may lead to premature failure under negative transients.
Does the SMAJ6.5AH require special handling during PCB assembly?
No special handling is required beyond standard SMT practices: the SMAJ6.5AH carries MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30 °C/60% RH and does not require baking before reflow. Its matte tin-plated leads meet J-STD-002 solderability requirements, ensuring reliable wetting during lead-free or SnPb reflow profiles without oxidation concerns.
How does the SMAJ6.5AH perform under repeated surge stress?
The SMAJ6.5AH is rated for non-repetitive surges only - each 10/1000 µs event must be separated by sufficient cooling time to avoid cumulative junction heating. Derating curves (Fig.2 in the datasheet) show that at 75 °C ambient, its peak pulse power drops to ~280 W. For repetitive surge environments, system-level thermal design and duty-cycle limits must be applied to prevent exceeding TJ(max) = 150 °C.
What automotive standards does the SMAJ6.5AH meet?
The SMAJ6.5AH is AEC-Q101 qualified and explicitly validated to meet ISO 7637-2 Pulse 1 (capacitive coupled transient), Pulse 2a (battery disconnect), Pulse 2b (inductive load switch-off), Pulse 3a (supply line spike), and Pulse 3b (ground bounce). These certifications are documented in Taiwan Semiconductor's qualification report A2102 and apply directly to the SMAJ6.5AH device lot.
SMAJ6.5AH 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):
- 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)
SMAJ6.5AH FAQ
1.How can I place an order for SMAJ6.5AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.5AH 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 SMAJ6.5AH reliable?
The price and inventory of SMAJ6.5AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ6.5AH is usually 5 days.
3.What payment methods are accepted for SMAJ6.5AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.5AH?
SMAJ6.5AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.5AH 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 SMAJ6.5AH?
For technical support, including SMAJ6.5AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5AH requirements.
6.How does Aetrix verify that SMAJ6.5AH is sourced from the original manufacturer or authorized distributors?
All SMAJ6.5AH 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 SMAJ6.5AH meets industry standards.
7.What is the process for return or replacement of SMAJ6.5AH?
All SMAJ6.5AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5AH, 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 SMAJ6.5AH part is unused and in its original packaging.
Return procedure for SMAJ6.5AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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