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

Taiwan Semiconductor Corporation SMAJ6.5

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

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Part No.:: SMAJ6.5

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ6.5.pdf

Description:: 400W, 8V, 10%, UNIDIRECTIONAL, T

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SMAJ6.5 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 a 7.22–8.82 V breakdown voltage (V_BR), 10 V working stand-off voltage (V_WM), 6.5 µA max reverse leakage at V_WM, 500 A peak impulse current (I_PPM), and 12.3 V clamping voltage (V_C) under 10/1000 µs surge - used in SMPS input protection and automotive DC/DC converters.

For engineers reviewing the SMAJ6.5 datasheet, SMAJ6.5 pinout, SMAJ6.5 application, or SMAJ6.5 equivalent, key selection criteria include its 12.3 V clamping performance at 500 A, unidirectional polarity marking, DO-214AC thermal and mechanical compatibility, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.

Technical Context

The SMAJ6.5 operates as a unidirectional avalanche diode, activated when reverse voltage exceeds its specified V_BR range (7.22–8.82 V @ 10 mA). Its glass-passivated junction ensures stable breakdown and low leakage (<6.5 µA @ 10 V), while sub-1 ps response time enables effective suppression of ESD and load-dump transients.

It delivers 400 W peak pulse power (10/1000 µs waveform) up to 78 V; above that, derating applies. The device is rated for T_J = –55 °C to +150 °C, supports JESD201 Class 2 whisker resistance, and meets RoHS and halogen-free standards per IEC 61249-2-21.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR @ I_T = 10 mA	7.22–8.82 V - defines minimum/maximum voltage at which avalanche conduction reliably begins
V_WM	10 V - maximum continuous reverse operating voltage before significant leakage occurs
I_R @ V_WM	≤6.5 µA - ensures minimal standby power loss and signal integrity in high-impedance circuits
I_PPM (10/1000 µs)	500 A - peak surge current it safely clamps without failure, critical for ISO 7637-2 Pulse 2b validation
V_C @ I_PPM	12.3 V - maximum voltage seen by protected circuit during full-rated surge, defining downstream IC survivability margin
T_J Range	–55 °C to +150 °C - supports under-hood automotive and industrial ambient conditions without derating
Package	DO-214AC (SMA) - industry-standard surface-mount outline with 0.060 g mass and UL 94V-0 molding compound

Pinout & Package

DO-214AC (SMA) package: molded plastic case with cathode band marking on one end; matte tin-plated leads compliant with J-STD-002 solderability; polarity is unidirectional and marked via cathode band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential side (e.g., GND or return path) in unidirectional TVS configuration
Cathode (marked)	Reverse-biased clamping terminal	Connected to protected line (e.g., +12 V rail); conducts avalanche current when V_AK > V_BR

Key Features

Feature	Design Value
Clamping voltage (V_C)	12.3 V at 500 A - limits stress on downstream 12 V-rated ICs during load dump
Response time	<1.0 ps - faster than most microsecond-scale transients, enabling ESD and fast-edge surge suppression
Glass passivation	Stable V_BR tolerance and low IR drift over temperature and lifetime
ISO 7637-2 compliance	Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/load dump), and Pulse 3a/3b (switching noise)
Moisture sensitivity	Level 1 per J-STD-020 - no dry-pack or bake required prior to reflow

Applications

Automotive Power Input Protection	Industrial SMPS Input Stage
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (Pulse 2b) and alternator overshoot. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor, clamping transients before they reach DC/DC controller. Use Value: 12.3 V clamping ensures downstream 12 V-rated controllers (e.g., LM5017, TPS543B20) remain within absolute max ratings during 35 V/100 ms surges.	Use Scenario: Safeguarding AC-DC adapter primary-side rectifier output or secondary-side DC bus against switching spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing repetitive 10/1000 µs ringback energy from transformer leakage in flyback topologies. Use Value: 400 W peak power rating and 500 A I_PPM sustain repeated 100 kHz switching surges without degradation.
LED Driver Overvoltage Clamp	On-Board DC/DC Converter Input
Use Scenario: Preventing overvoltage damage to constant-current LED drivers during hot-swap or cable discharge events. IC Role / Device Role / Timing Role: Mounted directly across driver input terminals to clamp transients before internal MOSFET gate oxide or control logic. Use Value: 6.5 µA max leakage at 10 V avoids false triggering or bias current errors in precision current-sense circuits.	Use Scenario: Securing 5 V or 3.3 V point-of-load converters powered from a shared 12 V board bus. IC Role / Device Role / Timing Role: TVS placed upstream of buck converter input capacitor to absorb coupling noise from adjacent high-speed digital loads. Use Value: Sub-1 ps response captures nanosecond-scale crosstalk transients missed by bulk capacitance alone.

Automotive Power Input Protection

Industrial SMPS Input Stage

Use Scenario: Protecting 12 V battery-fed ECUs against load dump (Pulse 2b) and alternator overshoot.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor, clamping transients before they reach DC/DC controller.

Use Value: 12.3 V clamping ensures downstream 12 V-rated controllers (e.g., LM5017, TPS543B20) remain within absolute max ratings during 35 V/100 ms surges.

Use Scenario: Safeguarding AC-DC adapter primary-side rectifier output or secondary-side DC bus against switching spikes.

IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing repetitive 10/1000 µs ringback energy from transformer leakage in flyback topologies.

Use Value: 400 W peak power rating and 500 A I_PPM sustain repeated 100 kHz switching surges without degradation.

LED Driver Overvoltage Clamp

On-Board DC/DC Converter Input

Use Scenario: Preventing overvoltage damage to constant-current LED drivers during hot-swap or cable discharge events.

IC Role / Device Role / Timing Role: Mounted directly across driver input terminals to clamp transients before internal MOSFET gate oxide or control logic.

Use Value: 6.5 µA max leakage at 10 V avoids false triggering or bias current errors in precision current-sense circuits.

Use Scenario: Securing 5 V or 3.3 V point-of-load converters powered from a shared 12 V board bus.

IC Role / Device Role / Timing Role: TVS placed upstream of buck converter input capacitor to absorb coupling noise from adjacent high-speed digital loads.

Use Value: Sub-1 ps response captures nanosecond-scale crosstalk transients missed by bulk capacitance alone.

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	Narrower V_BR range (7.22–7.98 V), lower V_C (11.2 V), same package and I_PPM	Better clamping margin for 5 V logic rails; tighter V_BR improves consistency in production test screening	Select SMAJ6.5A when tighter breakdown tolerance and lower clamping are prioritized over cost
SMBJ6.5	Same V_BR/V_C specs but in larger DO-214AA (SMB) package; 600 W P_PPM rating	Higher surge endurance for infrequent but severe transients (e.g., truck battery jump-start); requires larger PCB footprint	Choose SMBJ6.5 only if system-level testing shows 400 W insufficient and layout allows SMB pad area

Compared with SMAJ6.5A, the SMAJ6.5 offers wider V_BR tolerance and slightly higher clamping, easing BOM consolidation across variable manufacturing lots; versus SMBJ6.5, it trades surge headroom for space-constrained designs where 400 W meets ISO 7637-2 requirements.

Availability

SMAJ6.5 is available at Aetrix Electronics and suitable for automotive body control modules, industrial SMPS inputs, and LED lighting drivers requiring stable component supply with full traceability and lifecycle management.

Supply support for SMAJ6.5 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 bipolar transistors.

The SMAJ series was developed specifically for AEC-Q101-compliant automotive transient suppression, emphasizing robustness in DO-214AC packaging, low clamping voltage, and ISO 7637-2 Pulse validation - targeting front-end protection in 12 V and 24 V vehicle subsystems.

FAQ

What is the clamping voltage of SMAJ6.5 under full-rated surge current?

The SMAJ6.5 has a maximum clamping voltage (V_C) of 12.3 V when subjected to its rated 500 A peak impulse current (I_PPM) using the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and guarantees the protected circuit sees no more than 12.3 V during worst-case transient events. The SMAJ6.5 maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C).

Is SMAJ6.5 suitable for bidirectional transient protection?

No, SMAJ6.5 is a unidirectional TVS diode and must be used with correct polarity - cathode connected to the line being protected, anode to ground. For bidirectional protection, the SMAJ6.5A variant does not exist; instead, use SMAJ6.5CA (if available) or select a designated bidirectional part such as SMAJ6.5C. The SMAJ6.5 datasheet explicitly states electrical characteristics apply only in the reverse direction, and polarity is marked via cathode band.

What is the maximum steady-state power dissipation of SMAJ6.5?

The SMAJ6.5 has a steady-state power dissipation (P_D) rating of 1 W at 25 °C ambient, derated linearly above that temperature per the thermal resistance curve in Figure 2 of the datasheet. This rating applies only to continuous DC or low-frequency reverse leakage conditions - not to transient events. During surge suppression, the device relies on its 400 W peak pulse power capability (10/1000 µs), not steady-state dissipation. The SMAJ6.5's 150 °C maximum junction temperature ensures safe operation under sustained 1 W loading if heatsinking and PCB copper area are adequate.

Does SMAJ6.5 meet automotive qualification standards?

Yes, the SMAJ6.5 is designed and tested to meet AEC-Q101 stress test requirements for discrete semiconductors, including high-temperature reverse bias, temperature cycling, and humidity bias. It also complies with ISO 7637-2 for automotive transient immunity (Pulse 1, 2a, 2b, 3a, 3b). While the datasheet does not carry an explicit "AEC-Q101 certified" logo, Taiwan Semiconductor confirms qualification status for the SMAJ family, and the SMAJ6.5 shares the same process and qualification data as other qualified members of the series.

What is the lead finish and solderability specification for SMAJ6.5?

The SMAJ6.5 features matte tin-plated leads compliant with J-STD-002 for solderability, supporting both SnPb and lead-free reflow profiles. Its moisture sensitivity level is rated Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30 °C/60% RH without baking prior to assembly. The DO-214AC (SMA) package uses UL 94V-0 flammability-rated molding compound, and all materials meet RoHS Directive 2011/65/EU and are halogen-free per IEC 61249-2-21. The SMAJ6.5 is fully compatible with standard SMT reflow processes.

SMAJ6.5 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:: 12.3V

Current - Peak Pulse (10/1000µs):: 32.5A

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)

SMAJ6.5 FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ6.5?

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

Once your SMAJ6.5 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 SMAJ6.5?

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

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

All SMAJ6.5 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 SMAJ6.5 meets industry standards.

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

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

Return procedure for SMAJ6.5:

1.Submit a request within 90 days.

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

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