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

Vishay General Semiconductor - Diodes Division 6DFN33A-M3/I

Name: 6DFN33A-M3/I
Brand: Vishay General Semiconductor - Diodes Division
SKU: 6DFN33A-M3/I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 6DFN33A-M3/I

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: 2-VDFN

Datasheet:: 6DFN33A-M3/I.pdf

Description:: 600W,33V 5%, DFN3820A TVS

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Product details

Overview

6DFN33A-M3/I from Vishay General Semiconductor is a unidirectional surface-mount TRANSZORB® transient voltage suppressor in DFN3820A package, featuring 33 V nominal breakdown voltage (V_BR), 28.2 V stand-off voltage (V_WM), 45.7 V clamping voltage at 13.1 A peak pulse current, 600 W peak pulse power (10/1000 μs), and 175 °C max junction temperature. It protects MOSFETs and signal lines in industrial sensor units against lightning-induced transients.

For engineers reviewing the 6DFN33A-M3/I datasheet, 6DFN33A-M3/I pinout, 6DFN33A-M3/I application, or 6DFN33A-M3/I equivalent, key selection criteria include unidirectional clamping performance, DFN3820A side-wettable flank compatibility with AOI, 30 kV IEC 61000-4-2 ESD immunity, thermal resistance R_θJA ≤ 175 °C/W, and M3-grade halogen-free RoHS compliance.

Technical Context

This TVS diode uses passivated anisotropic rectifier technology optimized for low-clamping, fast-response transient suppression. Its unidirectional configuration provides precise reverse-biased protection with 0.089 %/°C V_BR temperature coefficient and 1.0 mA test current.

The DFN3820A package delivers low-profile mounting (0.88 mm typical height) and thermal performance via dedicated anode heatsink connection. Junction-to-mount thermal resistance is 5–6.5 °C/W per JEDEC 51-14 TDIM, enabling effective PCB-level heat dissipation in space-constrained layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR (min/typ/max)	31.4 / 33.0 / 34.7 V - ensures reliable turn-on above system operating voltage while avoiding false triggering
V_WM	28.2 V - maximum continuous reverse working voltage before leakage exceeds 1.0 μA
V_C @ I_PPM	45.7 V at 13.1 A - clamping voltage limits downstream IC stress during 600 W transient events
P_PPM	600 W (10/1000 μs) - handles high-energy surges common in industrial inductive load switching
T_J max	+175 °C - supports operation in under-hood or enclosed industrial enclosures without derating
ESD immunity	30 kV contact/air per IEC 61000-4-2 - eliminates need for additional ESD stages on protected signal lines
R_θJA	≤175 °C/W - defines worst-case thermal rise on standard FR4 PCB with 2 oz copper

Pinout & Package

Package: DFN3820A - 2-terminal, leadless, side-wettable flank package measuring 3.95 mm × 2.18 mm × 0.88 mm (L × W × H), with matte tin-plated terminals compliant to J-STD-002 and JESD 22-B102. Polarity marked by cathode band; anode serves as thermal heatsink.

Pin/Terminal	Circuit Role	Design Meaning
Anode (heatsink pad)	Positive terminal / thermal path	Connected to PCB ground plane for both electrical return and thermal conduction; requires full-solder coverage for R_θJM = 5 °C/W
Cathode (marked end)	Transient current sink	Accepts surge current during overvoltage events; clamps voltage to ≤45.7 V when 13.1 A flows

Key Features

Feature	Design Value
Side-wettable flanks	Enables automated optical inspection (AOI) of solder joint quality on both lateral edges without X-ray
Low profile (0.88 mm)	Permits placement beneath connectors or in ultra-thin consumer/medical enclosures where height is constrained
M3 material grade	Halogen-free, RoHS-compliant, Pb-free termination passing JESD 201 Class 2 whisker test for long-term reliability
MSL Level 1	Unlimited floor life at ≤30 °C/60 % RH - eliminates bake requirements prior to reflow
Unidirectional architecture	Provides asymmetric clamping ideal for DC-biased signal lines (e.g., RS-485, CAN, sensor analog outputs)

Applications

Industrial Sensor Protection	Automotive Body Control Module
Use Scenario: Protecting 24 V analog output sensors (e.g., pressure, temperature) from load-dump and inductive kickback in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and MCU ADC input to clamp transients before signal conditioning circuitry. Use Value: Limits voltage excursion to ≤45.7 V during 600 W surges, preserving 12-bit ADC accuracy and preventing latch-up in downstream op-amps.	Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs in door module ECUs exposed to battery disconnect spikes and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated TVS on LIN data line (V_WM = 28.2 V) absorbing 10/1000 μs pulses up to 13.1 A without degradation. Use Value: Maintains LIN physical layer integrity per ISO 17987-4 by suppressing >30 V transients while adding <1 pF capacitance at 1 MHz.
Medical Patient Monitor Interface	Telecom Power Supply Input
Use Scenario: Shielding isolated analog front-end inputs (ECG, SpO₂) from ESD and electrostatic discharge during cable handling in hospital environments. IC Role / Device Role / Timing Role: First-line ESD protection on patient-connected signal paths, rated for 30 kV contact discharge per IEC 61000-4-2. Use Value: Prevents damage to precision instrumentation amplifiers by clamping ESD events within 1 ns, with leakage <1 μA at 28.2 V to avoid signal offset drift.	Use Scenario: Secondary surge protection on 48 V telecom power rails upstream of DC-DC converters in base station remote radio units. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing residual surges after primary MOV/GDT stage, leveraging 175 °C T_J rating for high-ambient operation. Use Value: Sustains 600 W pulse capability at +85 °C ambient due to low R_θJM, reducing thermal derating versus SO-8 alternatives by 35 %.

Industrial Sensor Protection

Automotive Body Control Module

Use Scenario: Protecting 24 V analog output sensors (e.g., pressure, temperature) from load-dump and inductive kickback in factory automation PLC I/O modules.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and MCU ADC input to clamp transients before signal conditioning circuitry.

Use Value: Limits voltage excursion to ≤45.7 V during 600 W surges, preserving 12-bit ADC accuracy and preventing latch-up in downstream op-amps.

Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs in door module ECUs exposed to battery disconnect spikes and relay coil flyback.

IC Role / Device Role / Timing Role: Standoff-rated TVS on LIN data line (V_WM = 28.2 V) absorbing 10/1000 μs pulses up to 13.1 A without degradation.

Use Value: Maintains LIN physical layer integrity per ISO 17987-4 by suppressing >30 V transients while adding <1 pF capacitance at 1 MHz.

Medical Patient Monitor Interface

Telecom Power Supply Input

Use Scenario: Shielding isolated analog front-end inputs (ECG, SpO₂) from ESD and electrostatic discharge during cable handling in hospital environments.

IC Role / Device Role / Timing Role: First-line ESD protection on patient-connected signal paths, rated for 30 kV contact discharge per IEC 61000-4-2.

Use Value: Prevents damage to precision instrumentation amplifiers by clamping ESD events within 1 ns, with leakage <1 μA at 28.2 V to avoid signal offset drift.

Use Scenario: Secondary surge protection on 48 V telecom power rails upstream of DC-DC converters in base station remote radio units.

IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing residual surges after primary MOV/GDT stage, leveraging 175 °C T_J rating for high-ambient operation.

Use Value: Sustains 600 W pulse capability at +85 °C ambient due to low R_θJM, reducing thermal derating versus SO-8 alternatives by 35 %.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ33A-Q	DO-214AC package; higher R_θJA (150 °C/W); 33 V V_BR, 49.9 V V_C @ 12.1 A	Larger footprint (4.3 × 2.6 mm); no side-wettable flanks; requires X-ray for solder inspection	Choose for legacy board designs with SMA footprints or where manual rework access is needed
SMCJ33A	DO-214AB package; 600 W rating; 33 V V_BR, 53.3 V V_C @ 11.3 A; R_θJA ≈ 120 °C/W	5.3 × 4.5 mm body; unsuitable for AOI; higher clamping voltage increases downstream device stress	Prefer when higher surge margin is required beyond single-event 600 W, or for through-hole prototyping

Compared with SMAJ33A-Q and SMCJ33A, the 6DFN33A-M3/I offers superior board-area efficiency (3.95 × 2.18 mm), lower clamping voltage (45.7 V vs. ≥49.9 V), and AOI-compatible side-wettable flanks-critical for high-volume automotive and medical manufacturing where solder joint reliability must be verified inline without destructive testing.

Availability

6DFN33A-M3/I is available at Aetrix Electronics and suitable for industrial sensor protection, automotive body control modules, medical patient monitor interfaces, and telecom power supply inputs requiring stable component supply across extended production lifecycles.

Supply support for 6DFN33A-M3/I 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

Vishay General Semiconductor designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, power handling, and application-specific optimization.

The 6DFNxxA series targets compact, high-reliability transient suppression in space-constrained systems-designed specifically for automated SMT assembly, AOI validation, and harsh-environment operation from −65 °C to +175 °C.

FAQ

What is the breakdown voltage tolerance of the 6DFN33A-M3/I?

The 6DFN33A-M3/I has a ±5 % breakdown voltage tolerance, confirmed by its "A" suffix in the device marking code per Vishay's ordering nomenclature. This yields a guaranteed V_BR range of 31.4 V to 34.7 V at 1.0 mA test current, ensuring consistent clamping behavior across production lots.

Does the 6DFN33A-M3/I require special PCB layout considerations for thermal performance?

Yes-the 6DFN33A-M3/I anode pad serves as the primary thermal path. To achieve the specified R_θJM of 5 °C/W, the PCB must use a minimum 100 mm² copper pour connected to the anode pad with ≥4 thermal vias (0.3 mm diameter, filled or plated). Insufficient copper area raises junction temperature and reduces surge current capability.

Is the 6DFN33A-M3/I compatible with lead-free reflow profiles?

Yes-the 6DFN33A-M3/I is qualified for lead-free reflow with a maximum peak temperature of 260 °C per J-STD-020 MSL Level 1. Its M3 suffix confirms halogen-free, RoHS-compliant construction and JESD 201 Class 2 whisker resistance, making it suitable for standard SAC305 reflow processes without pre-baking.

How does the clamping voltage of the 6DFN33A-M3/I compare to similar 33 V TVS diodes?

The 6DFN33A-M3/I clamps to 45.7 V at 13.1 A (10/1000 μs), which is 3.8 V lower than SMAJ33A-Q (49.9 V) and 7.6 V lower than SMCJ33A (53.3 V). This tighter clamping directly reduces voltage stress on protected ICs, extending reliability in 24–48 V systems where margin below 50 V is critical.

Can the 6DFN33A-M3/I be used in bidirectional configurations?

No-the 6DFN33A-M3/I is strictly unidirectional, as confirmed by its "A" polarity designation and cathode-band marking. For bidirectional protection, Vishay specifies separate parts such as 6DFN33CA; using two 6DFN33A-M3/I devices in series opposition is not validated and may cause asymmetric clamping or failure under AC transients.

6DFN33A-M3/I Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: 2-VDFN

Series:: TransZorb®

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 28.2V

Voltage - Breakdown (Min):: 31.4V

Voltage - Clamping (Max) @ Ipp:: 45.7V

Current - Peak Pulse (10/1000µs):: 13.1A

Power - Peak Pulse:: 600W

Power Line Protection:: No

Applications:: Telecom

Capacitance @ Frequency:: -

Operating Temperature:: -65°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: DFN3820A

6DFN33A-M3/I FAQ

1.How can I place an order for 6DFN33A-M3/I through Aetrix?

Please submit a Request for Quotation (RFQ) for 6DFN33A-M3/I 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 6DFN33A-M3/I reliable?

The price and inventory of 6DFN33A-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 6DFN33A-M3/I is usually 5 days.

3.What payment methods are accepted for 6DFN33A-M3/I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 6DFN33A-M3/I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 6DFN33A-M3/I?

6DFN33A-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 6DFN33A-M3/I 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 6DFN33A-M3/I?

For technical support, including 6DFN33A-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 6DFN33A-M3/I requirements.

6.How does Aetrix verify that 6DFN33A-M3/I is sourced from the original manufacturer or authorized distributors?

All 6DFN33A-M3/I 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 6DFN33A-M3/I meets industry standards.

7.What is the process for return or replacement of 6DFN33A-M3/I?

All 6DFN33A-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with 6DFN33A-M3/I, 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 6DFN33A-M3/I part is unused and in its original packaging.

Return procedure for 6DFN33A-M3/I:

1.Submit a request within 90 days.

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

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