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Taiwan Semiconductor Corporation SMAJ6.5H
- Part No.:
- SMAJ6.5H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.5H.pdf
- Description:
- 400W, 8V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,428
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Product details
Overview
SMAJ6.5H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails. It features a 7.22–8.82 V breakdown voltage (VBR), 10 V working stand-off voltage (VWM), 12.3 V clamping voltage (VC) at 500 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive-grade SMPS and on-board DC/DC converters.
For engineers reviewing the SMAJ6.5H datasheet, SMAJ6.5H pinout, SMAJ6.5H application, or SMAJ6.5H equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AC (SMA) package compatibility, sub-1 ps response time, <1 µA leakage above 10 V, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance for automotive transients.
Technical Context
The SMAJ6.5H operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast clamping of inductive switching spikes and load-dump transients. Its breakdown occurs at 7.22–8.82 V under 10 mA test current, and it maintains stable clamping at 12.3 V up to 500 A (10/1000 µs), with thermal derating above 25°C per Fig.2.
It supports bidirectional variants via CH/CAH suffixes but SMAJ6.5H itself is unidirectional, marked with cathode band, and rated for -55°C to +150°C junction operation. Moisture sensitivity is Level 1 (J-STD-020), and terminals are matte tin-plated for J-STD-002 solderability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10 V - Maximum continuous reverse operating voltage before significant leakage begins; sets upper limit for safe DC rail placement. |
| VBR min/max | 7.22–8.82 V @ 10 mA - Confirmed avalanche onset range; ensures reliable triggering within defined tolerance for 6.5 V nominal systems. |
| VC @ IPPM | 12.3 V @ 500 A - Clamped voltage during worst-case 10/1000 µs surge; defines maximum stress imposed on protected downstream ICs. |
| IR @ VWM | ≤6.5 µA - Ultra-low reverse leakage at stand-off voltage; minimizes standby power loss in battery-backed or low-power systems. |
| PPPM | 400 W (10/1000 µs) - Peak pulse power handling capacity; sufficient for ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2a (battery disconnect). |
| TJ max | +150°C - Maximum junction temperature; enables use in under-hood automotive environments and high-ambient industrial power supplies. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Case meets UL 94V-0 flammability rating; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-potential node; completes clamping path during transient events. |
| Cathode | High-side input terminal | Connected to protected line (e.g., 12 V rail); conducts avalanche current when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress-test requirements including HTOL, TCT, and ESD; suitable for engine control, body modules, and ADAS power stages. |
| Clamping response time | Typically <1.0 ps - Enables suppression of nanosecond-scale ESD and fast-switching noise before sensitive logic or analog circuitry is damaged. |
| Glass passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives; critical for high-humidity or condensing environments. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a (battery disconnection), Pulse 2b (alternator field decay), and Pulses 3a/3b (capacitive coupling) - full automotive transient immunity. |
Applications
| Automotive Power Distribution | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting 12 V supply lines in vehicle infotainment head units against load-dump transients up to 35 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and DC/DC converter input. Use Value: Limits transient voltage to ≤12.3 V, preventing latch-up or damage to 16 V-rated buck controller ICs and enabling AEC-Q100-compliant system design. |
Use Scenario: Safeguarding AC-DC adapter output rails feeding PLC I/O modules exposed to relay coil back-EMF. IC Role / Device Role / Timing Role: Standoff-clamp device on secondary-side 12 V bus, triggered only during >10 V surges. Use Value: Absorbs 400 W pulses without degradation, maintaining <6.5 µA leakage at nominal 10 V operation to preserve efficiency in always-on monitoring circuits. |
| LED Driver Overvoltage Protection | On-Board DC/DC Converter Input |
Use Scenario: Securing constant-current LED driver inputs in streetlight controllers subjected to lightning-induced surges on 24 V distribution lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input filter capacitor and PWM controller. Use Value: Clamps 500 A transients to 12.3 V within <1 ps, preserving MOSFET gate oxide integrity and avoiding false shutdown of current-sense amplifiers. |
Use Scenario: Input protection for 5 V → 3.3 V buck converters powering automotive camera modules. IC Role / Device Role / Timing Role: Fast-acting shunt element between VIN and GND, activated only during ISO 7637-2 Pulse 1 events. Use Value: Enables use of smaller input capacitors by limiting voltage overshoot to 12.3 V, reducing board space while meeting OEM EMC immunity specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.5AH | Lower VBR range (7.22–7.98 V) and tighter tolerance; same VC = 11.2 V @ 500 A. | Better suited for precision 6.5 V rail protection where lower clamping threshold is required. | Select SMAJ6.5AH when tighter VBR tolerance and marginally lower clamping are prioritized over cost. |
| SMBJ6.5H | Same electrical specs but in DO-214AA (SMB) package - 2.5 mm wider, higher thermal mass, 600 W PPPM. | Preferred for higher-reliability industrial designs requiring greater surge margin or improved thermal dissipation. | Choose SMBJ6.5H when PCB layout allows larger footprint and system-level testing demands >400 W surge headroom. |
Compared with SMAJ6.5AH, the SMAJ6.5H offers broader VBR tolerance and slightly higher clamping; versus SMBJ6.5H, it trades surge capacity and thermal robustness for compact DO-214AC footprint - making SMAJ6.5H optimal for space-constrained automotive modules needing AEC-Q101 validation and proven 400 W capability.
Availability
SMAJ6.5H is available at Aetrix Electronics and suitable for automotive power distribution, industrial SMPS input protection, and LED driver overvoltage safeguarding requiring stable component supply across extended production cycles.
Supply support for SMAJ6.5H 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, and rectifiers with global automotive and industrial certifications.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in automotive power networks and industrial DC rails, emphasizing fast response, low leakage, and robust surge endurance in compact surface-mount packages.
FAQ
What is the breakdown voltage range of the SMAJ6.5H?
The SMAJ6.5H has a guaranteed breakdown voltage (VBR) range of 7.22 V to 8.82 V at 10 mA test current, as specified in the official Taiwan Semiconductor datasheet revision A2102. This range ensures reliable turn-on behavior across manufacturing lots and temperature extremes, supporting consistent protection performance in 12 V automotive and industrial systems where the SMAJ6.5H is deployed.
Is the SMAJ6.5H unidirectional or bidirectional?
The SMAJ6.5H is a unidirectional TVS diode, indicated by its single cathode band marking and absence of "C" or "CA" suffix. It conducts only during positive transients on the cathode terminal and blocks reverse voltage up to its 10 V working stand-off rating. Bidirectional variants (e.g., SMAJ6.5CH) exist but are distinct part numbers - the SMAJ6.5H itself is strictly unidirectional and must be oriented correctly on PCBs.
Does the SMAJ6.5H meet automotive qualification standards?
Yes, the SMAJ6.5H is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its glass-passivated junction, Level 1 moisture sensitivity rating, and -55°C to +150°C operating range confirm suitability for under-hood and chassis-mounted automotive applications - a core design objective validated in the SMAJ6.5H product release documentation.
What is the clamping voltage of the SMAJ6.5H under surge conditions?
The SMAJ6.5H clamps to a maximum of 12.3 V when subjected to a 500 A peak impulse current with a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25°C) and defines the upper voltage limit imposed on protected circuitry during worst-case transients - a critical parameter used in selecting downstream ICs with appropriate absolute maximum ratings relative to the SMAJ6.5H's clamping performance.
Can the SMAJ6.5H replace SMAJ6.0H or SMAJ7.0H in existing designs?
The SMAJ6.5H is not a direct drop-in replacement for SMAJ6.0H or SMAJ7.0H due to differences in VBR (6.67–8.15 V and 7.78–9.51 V respectively) and clamping voltage (11.4 V and 13.3 V). While all share the DO-214AC package and pinout, substituting SMAJ6.5H requires revalidation of system-level surge margin and stand-off compatibility - especially where precise VWM/VBR alignment affects fault detection thresholds or power sequencing in the host design using SMAJ6.5H.
SMAJ6.5H 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):
- 6.5V
- Voltage - Breakdown (Min):
- 7.22V
- Voltage - Clamping (Max) @ Ipp:
- 12.3V
- Current - Peak Pulse (10/1000µs):
- 32.5A
- 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)
SMAJ6.5H FAQ
1.How can I place an order for SMAJ6.5H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.5H 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 SMAJ6.5H reliable?
The price and inventory of SMAJ6.5H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ6.5H is usually 5 days.
3.What payment methods are accepted for SMAJ6.5H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.5H?
SMAJ6.5H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.5H 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 SMAJ6.5H?
For technical support, including SMAJ6.5H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5H requirements.
6.How does Aetrix verify that SMAJ6.5H is sourced from the original manufacturer or authorized distributors?
All SMAJ6.5H 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 SMAJ6.5H meets industry standards.
7.What is the process for return or replacement of SMAJ6.5H?
All SMAJ6.5H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5H, 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 SMAJ6.5H part is unused and in its original packaging.
Return procedure for SMAJ6.5H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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