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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Taiwan Semiconductor Corporation SMAJ6.5A

Name: SMAJ6.5A
Brand: Taiwan Semiconductor Corporation
SKU: SMAJ6.5A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMAJ6.5A

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ6.5A.pdf

Description:: TVS DIODE 6.5VWM 11.2VC DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:7,500

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Product details

Overview

SMAJ6.5A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast transients in DC power lines. It features 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.

For engineers reviewing the SMAJ6.5A datasheet, SMAJ6.5A pinout, SMAJ6.5A application, or SMAJ6.5A equivalent, key selection criteria include working stand-off voltage (10 V), reverse leakage (<6.5 µA at V_WM), clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, and compatibility with automated SMT placement on power rails requiring robust ESD and surge immunity.

Technical Context

The SMAJ6.5A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 7.22–7.98 V breakdown range at 10 mA test current. Its glass-passivated junction enables sub-1 ps response time and stable clamping under repetitive surge stress.

It delivers 11.2 V clamping voltage at 500 A (10/1000 µs), with thermal derating above 25°C per Fig.2 and maximum junction temperature of 150°C. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability board-level protection.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	10 V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for protected line voltage.
V_BR min/max	7.22 V / 7.98 V - Breakdown occurs within this range at 10 mA; defines turn-on threshold tolerance for surge initiation.
V_C @ I_PPM	11.2 V - Clamped voltage seen by downstream circuitry during 500 A transient; determines maximum stress on protected ICs.
I_PPM	500 A - Peak surge current handled with 10/1000 µs waveform; validates compliance with ISO 7637-2 Pulse 1/2a/2b.
P_PK	400 W - Peak pulse power dissipation capability; confirms suitability for automotive load-dump and inductive switching events.
I_R @ V_WM	<6.5 µA - Reverse leakage at stand-off voltage; ensures minimal standby power loss and signal integrity in low-current rails.
T_J max	150 °C - Maximum junction temperature; supports operation in enclosed industrial or automotive under-hood environments.

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability; polarity is unidirectional, marked by cathode band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Input side of protected line (e.g., +V_IN)	Connected to source of transient energy; carries full surge current during clamping event.
Cathode	Clamp reference node (e.g., GND or return path)	Provides low-impedance path to ground during overvoltage; must be routed with minimal inductance for effective clamping.

Key Features

Feature	Design Value
Glass-passivated junction	Ensures stable, repeatable breakdown characteristics and long-term reliability under repeated surge stress.
Sub-1 ps response time	Enables suppression of ultrafast ESD and lightning-induced transients before sensitive components are damaged.
ISO 7637-2 compliance	Validates robustness against automotive electrical disturbances including Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling).
Moisture sensitivity level 1	Eliminates need for dry-pack handling or baking prior to reflow, simplifying manufacturing logistics.
RoHS & halogen-free	Meets IEC 61249-2-21 and environmental compliance requirements for consumer, industrial, and automotive end equipment.

Applications

Switching Mode Power Supply (SMPS)	On-board DC/DC Converter
Use Scenario: Input stage of AC/DC adapter or isolated flyback converter subjected to line surges and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rectifier output and primary-side controller supply rail. Use Value: Limits transient voltage to ≤11.2 V, protecting PWM controller ICs rated for 12–15 V V_DD without derating or external crowbar circuits.	Use Scenario: 12 V to 3.3 V buck converter on embedded control board exposed to hot-swap and backplane coupling noise. IC Role / Device Role / Timing Role: TVS connected across input capacitor to clamp fast-rising transients from adjacent switching stages. Use Value: Maintains <6.5 µA leakage at 10 V stand-off, avoiding unnecessary loading of low-power microcontroller supply domains.
Lighting Application	Automotive Body Control Module (BCM)
Use Scenario: LED driver input in streetlight or commercial fixture with long cable runs susceptible to induced surges. IC Role / Device Role / Timing Role: Primary-line TVS on 24 V or 48 V DC input bus upstream of PFC and driver ICs. Use Value: Withstands 400 W peak pulse power, enabling compliance with IEC 61000-4-5 Level 3 (2 kV/1 kA) without derating.	Use Scenario: CAN/LIN interface power rail in BCM exposed to battery disconnect/load dump per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Stand-off protection on 5 V or 12 V supply feeding transceiver and MCU peripherals. Use Value: Clamps to 11.2 V within 1 ps, preventing latch-up or permanent damage to 5 V logic interfaces during 100 V/50 ms load dump events.

Switching Mode Power Supply (SMPS)

On-board DC/DC Converter

Use Scenario: Input stage of AC/DC adapter or isolated flyback converter subjected to line surges and ESD.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rectifier output and primary-side controller supply rail.

Use Value: Limits transient voltage to ≤11.2 V, protecting PWM controller ICs rated for 12–15 V V_DD without derating or external crowbar circuits.

Use Scenario: 12 V to 3.3 V buck converter on embedded control board exposed to hot-swap and backplane coupling noise.

IC Role / Device Role / Timing Role: TVS connected across input capacitor to clamp fast-rising transients from adjacent switching stages.

Use Value: Maintains <6.5 µA leakage at 10 V stand-off, avoiding unnecessary loading of low-power microcontroller supply domains.

Lighting Application

Automotive Body Control Module (BCM)

Use Scenario: LED driver input in streetlight or commercial fixture with long cable runs susceptible to induced surges.

IC Role / Device Role / Timing Role: Primary-line TVS on 24 V or 48 V DC input bus upstream of PFC and driver ICs.

Use Value: Withstands 400 W peak pulse power, enabling compliance with IEC 61000-4-5 Level 3 (2 kV/1 kA) without derating.

Use Scenario: CAN/LIN interface power rail in BCM exposed to battery disconnect/load dump per ISO 7637-2 Pulse 5a.

IC Role / Device Role / Timing Role: Stand-off protection on 5 V or 12 V supply feeding transceiver and MCU peripherals.

Use Value: Clamps to 11.2 V within 1 ps, preventing latch-up or permanent damage to 5 V logic interfaces during 100 V/50 ms load dump events.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ6.5	Higher clamping voltage (12.3 V vs. 11.2 V) and wider V_BR range (7.22–8.82 V); same package and stand-off voltage.	Less aggressive clamping margin for 12 V systems with tight voltage tolerances.	Select SMAJ6.5A when lower clamping voltage is required to protect 12 V-rated ICs; choose SMAJ6.5 only if higher V_C is acceptable.
SMBJ6.5A	Same electrical specs but in larger DO-214AA (SMB) package; 600 W peak power rating (vs. 400 W).	Higher surge margin for industrial applications with extended surge duration or multiple-event exposure.	Choose SMBJ6.5A when PCB layout allows larger footprint and higher energy absorption is needed; SMAJ6.5A remains optimal for space-constrained SMT designs.

Compared with SMAJ6.5 and SMBJ6.5A, the SMAJ6.5A offers the lowest clamping voltage in the SMA footprint, making it ideal for protecting 12 V systems where voltage headroom is critical-while maintaining full ISO 7637-2 compliance and automated placement compatibility.

Availability

SMAJ6.5A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, lighting applications, and automotive body control modules requiring stable component supply and consistent surge immunity performance.

Supply support for SMAJ6.5A 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, MOSFETs, and power management devices.

The SMAJ series is part of TSC's high-reliability transient suppression product line, engineered specifically for automotive, industrial, and consumer power-line protection where fast response, low clamping, and AEC-Q200 readiness are essential.

FAQ

What is the breakdown voltage range of the SMAJ6.5A?

The SMAJ6.5A has a guaranteed breakdown voltage range of 7.22 V to 7.98 V at 10 mA test current, measured per JEDEC standards. This narrow V_BR window ensures predictable turn-on behavior across production lots and temperature ranges, critical for consistent clamping in 12 V system rails. The SMAJ6.5A maintains this specification across its full operating junction temperature range of –55°C to +150°C.

Is the SMAJ6.5A unidirectional or bidirectional?

The SMAJ6.5A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its cathode-band polarity marking. It conducts only during reverse-biased overvoltage events and blocks forward current up to 3.5 V at 25 A. For bidirectional protection, engineers must select SMAJ6.5CA or equivalent variants-not the SMAJ6.5A.

Does the SMAJ6.5A meet automotive surge immunity standards?

Yes, the SMAJ6.5A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electronic modules. Its 400 W peak pulse power rating with 10/1000 µs waveform, sub-1 ps response time, and 11.2 V clamping voltage at 500 A enable reliable suppression of load-dump, inductive switching, and capacitive coupling transients encountered in 12 V vehicle networks.

What is the maximum clamping voltage of the SMAJ6.5A under surge conditions?

The SMAJ6.5A exhibits a maximum clamping voltage of 11.2 V when subjected to its rated 500 A peak impulse current with a 10/1000 µs waveform. This value is measured at the device terminals under standardized test conditions and represents the highest voltage imposed on protected circuitry during worst-case transient events-enabling precise margin analysis for downstream 12 V logic and power ICs.

Can the SMAJ6.5A be used in automated SMT assembly processes?

Yes, the SMAJ6.5A is explicitly designed for automated placement, as stated in its official features list. Its DO-214AC (SMA) package, matte tin-plated leads compliant with J-STD-002, and moisture sensitivity level 1 rating eliminate pre-bake requirements and ensure reliable solder joint formation in standard reflow profiles-making it fully compatible with high-volume SMT lines for power supply and automotive electronics manufacturing.

SMAJ6.5A 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:: General Purpose

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

SMAJ6.5A FAQ

1.How can I place an order for SMAJ6.5A through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ6.5A 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 SMAJ6.5A reliable?

The price and inventory of SMAJ6.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ6.5A is usually 5 days.

3.What payment methods are accepted for SMAJ6.5A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ6.5A?

SMAJ6.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ6.5A 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 SMAJ6.5A?

For technical support, including SMAJ6.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5A requirements.

6.How does Aetrix verify that SMAJ6.5A is sourced from the original manufacturer or authorized distributors?

All SMAJ6.5A 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 SMAJ6.5A meets industry standards.

7.What is the process for return or replacement of SMAJ6.5A?

All SMAJ6.5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5A, 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 SMAJ6.5A part is unused and in its original packaging.

Return procedure for SMAJ6.5A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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