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

Vishay General Semiconductor - Diodes Division SMAJ33-E3/61

Name: SMAJ33-E3/61
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMAJ33-E3/61
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMAJ33-E3/61

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ33-E3/61.pdf

Description:: TVS DIODE 33VWM 59VC DO214AC

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Product details

Overview

SMAJ33-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features a 33 V stand-off voltage (V_WM), 36.7–44.9 V breakdown voltage (V_BR at 1 mA), 59.0 V maximum clamping voltage (V_C) at 6.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.

For engineers reviewing the SMAJ33-E3/61 datasheet, SMAJ33-E3/61 pinout, SMAJ33-E3/61 application, or SMAJ33-E3/61 equivalent, this device delivers verified transient suppression performance with RoHS-compliant matte tin-plated leads, MSL Level 1 moisture sensitivity, and JESD201 Class 1A whisker resistance - critical for automated SMT assembly and long-term reliability in harsh environments.

Technical Context

This unidirectional TVS diode operates as a voltage-clamping protection element placed in parallel with sensitive circuit nodes. Its silicon avalanche junction provides sub-nanosecond response to ESD and surge events, with low incremental surge resistance ensuring minimal voltage overshoot during 10/1000 µs transients.

Thermal performance is defined by R_θJA = 120 °C/W (on 0.2 × 0.2" copper pads) and R_θJL = 30 °C/W, supporting operation from –55 °C to +150 °C junction temperature. The device sustains 40 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits ≤1.0 µA reverse leakage at V_WM.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	33 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system operating margin.
V_BR (min/max)	36.7 V / 44.9 V at 1 mA - Confirmed breakdown range ensures reliable turn-on across process variation and temperature.
V_C @ I_PPM	59.0 V at 6.8 A - Clamping voltage under 10/1000 µs surge defines worst-case overvoltage seen by protected ICs.
P_PPM	400 W - Peak pulse power handling capability with standard 10/1000 µs test waveform.
I_FSM	40 A - Single half-sine surge current rating (8.3 ms), critical for inductive load switching protection.
T_J Range	–55 °C to +150 °C - Full industrial temperature operation without derating loss of clamping integrity.
Package	DO-214AC (SMA) - Standard surface-mount outline with cathode band marking; compatible with JEDEC MS-013.

Pinout & Package

DO-214AC (SMA) package: molded plastic case with two terminals, cathode marked by a band on one end. Matte tin-plated leads meet J-STD-002 and JESD22-B102 solderability requirements. Mounting uses 0.2 × 0.2" (5.0 × 5.0 mm) copper pads per terminal for rated power dissipation.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Low-side reference node	Connected to ground or lower-potential rail; forms clamping path when cathode exceeds V_WM.
Cathode	Protected line input	Connected to supply rail or signal line; conducts avalanche current to anode during overvoltage events.

Key Features

Feature	Design Value
Glass-passivated junction	Ensures stable avalanche characteristics and long-term reliability under repeated surge stress.
MSL Level 1 rating	Enables direct placement without baking; supports lead-free reflow up to 260 °C peak.
RoHS-compliant & WEEE compliant	Meets EU environmental directives; no hazardous substances in molding compound or plating.
Low incremental surge resistance	Minimizes V_C overshoot during fast transients, improving protection margin for downstream ICs.
Automated placement optimized	Low-profile DO-214AC footprint and consistent lead geometry support high-yield pick-and-place.

Applications

Industrial Power Supply Protection	Automotive Sensor Interface Protection
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and ground to clamp surges before they reach DC-DC converter ICs. Use Value: Limits transient voltage to ≤59.0 V, preventing damage to 36 V-rated input stages while sustaining 400 W peak pulses.	Use Scenario: CAN bus physical layer interface in engine control unit (ECU), subject to ISO 7637-2 Pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Standoff protection device on V_CC rail feeding CAN transceiver, absorbing coupled energy from adjacent harnesses. Use Value: Clamps 10/1000 µs surges within 1 ns, maintaining <1 µA leakage at 33 V to avoid loading low-power sensor bias networks.
Consumer Equipment AC/DC Adapter Output	Telecom Line Card Surge Protection
Use Scenario: Secondary-side 33 V output of isolated flyback adapter powering USB-C PD controller and display backlight driver. IC Role / Device Role / Timing Role: Overvoltage clamp on regulated output rail, guarding against feedback loop failure or transformer saturation. Use Value: 33 V V_WM aligns precisely with nominal output, enabling early clamping before downstream 36 V-rated ICs exceed absolute maximum ratings.	Use Scenario: Protection of Ethernet PHY power pins (3.3 V or 5 V rails) on telecom line card subjected to lightning-induced surges via shared backplane. IC Role / Device Role / Timing Role: Primary-stage TVS on board-level power distribution network, upstream of local LDOs and decoupling. Use Value: 400 W rating handles multi-kV induced transients; DO-214AC package allows dense layout near connectors without compromising creepage.

Industrial Power Supply Protection

Automotive Sensor Interface Protection

Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and inductive switching noise.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and ground to clamp surges before they reach DC-DC converter ICs.

Use Value: Limits transient voltage to ≤59.0 V, preventing damage to 36 V-rated input stages while sustaining 400 W peak pulses.

Use Scenario: CAN bus physical layer interface in engine control unit (ECU), subject to ISO 7637-2 Pulse 1/2a/5a transients.

IC Role / Device Role / Timing Role: Standoff protection device on V_CC rail feeding CAN transceiver, absorbing coupled energy from adjacent harnesses.

Use Value: Clamps 10/1000 µs surges within 1 ns, maintaining <1 µA leakage at 33 V to avoid loading low-power sensor bias networks.

Consumer Equipment AC/DC Adapter Output

Telecom Line Card Surge Protection

Use Scenario: Secondary-side 33 V output of isolated flyback adapter powering USB-C PD controller and display backlight driver.

IC Role / Device Role / Timing Role: Overvoltage clamp on regulated output rail, guarding against feedback loop failure or transformer saturation.

Use Value: 33 V V_WM aligns precisely with nominal output, enabling early clamping before downstream 36 V-rated ICs exceed absolute maximum ratings.

Use Scenario: Protection of Ethernet PHY power pins (3.3 V or 5 V rails) on telecom line card subjected to lightning-induced surges via shared backplane.

IC Role / Device Role / Timing Role: Primary-stage TVS on board-level power distribution network, upstream of local LDOs and decoupling.

Use Value: 400 W rating handles multi-kV induced transients; DO-214AC package allows dense layout near connectors without compromising creepage.

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-E3/61	Lower V_BR range (36.7–40.6 V), tighter tolerance; 53.3 V clamping at 7.5 A.	Better suited for systems requiring tighter clamping voltage control and lower let-through energy.	Select SMAJ33A-E3/61 when design requires reduced V_C margin and tighter V_BR consistency.
SMBJ33-E3/52	Same V_WM/V_BR, but SMB package (DO-214AA); 600 W P_PPM, higher I_PPM (10.3 A).	Higher power handling enables longer surge duration immunity; larger footprint required.	Choose SMBJ33-E3/52 where 600 W surge rating is mandatory and PCB space permits larger package.

Compared with SMAJ33-E3/61, the SMAJ33A-E3/61 offers tighter clamping precision at lower surge current, while the SMBJ33-E3/52 trades compactness for 50 % higher pulse power capacity - selection depends on layout constraints, surge profile severity, and V_C margin requirements.

Availability

SMAJ33-E3/61 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor modules, and telecom line cards requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for SMAJ33-E3/61 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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability and application-specific performance.

The SMAJ series was developed for robust, surface-mount transient suppression in high-volume industrial and automotive electronics, balancing clamping accuracy, surge endurance, and automated assembly compatibility.

FAQ

What is the maximum clamping voltage of SMAJ33-E3/61 under standard surge conditions?

The SMAJ33-E3/61 has a maximum clamping voltage (V_C) of 59.0 V when subjected to its rated peak pulse current of 6.8 A with a 10/1000 µs waveform. This value is measured at T_A = 25 °C on specified copper pad layout and defines the upper voltage limit imposed on protected circuits during transient events. The SMAJ33-E3/61 maintains this clamping performance across its full operating temperature range.

Is SMAJ33-E3/61 unidirectional or bidirectional, and how is polarity identified?

SMAJ33-E3/61 is a unidirectional TVS diode, meaning it conducts only during reverse-biased overvoltage events. Polarity is indicated by a cathode band on the package body - the banded end connects to the protected line (higher potential), while the unbanded end connects to ground or reference. Bidirectional variants use "CA" suffix (e.g., SMAJ33CA) and lack polarity marking.

Does SMAJ33-E3/61 meet automotive qualification standards?

No, SMAJ33-E3/61 is commercial-grade (E3 suffix) and not AEC-Q101 qualified. For automotive applications, Vishay offers the SMAJ33HE3/61 variant (HE3 suffix), which is high-reliability, AEC-Q101 qualified, and rated for extended temperature and lifetime stress testing. The SMAJ33-E3/61 remains suitable for industrial and consumer equipment meeting commercial reliability requirements.

What is the reverse leakage current specification for SMAJ33-E3/61 at its stand-off voltage?

At its 33 V stand-off voltage (V_WM) and T_A = 25 °C, the SMAJ33-E3/61 exhibits a maximum reverse leakage current (I_D) of 1.0 µA. This low leakage ensures minimal power loss and avoids unintended loading of high-impedance sensor bias networks or low-quiescent current regulators in systems where SMAJ33-E3/61 is deployed.

Can SMAJ33-E3/61 be used in place of SMAJ33A-E3/61?

SMAJ33-E3/61 and SMAJ33A-E3/61 are not interchangeable without design review: SMAJ33-E3/61 has higher V_BR (36.7–44.9 V) and higher V_C (59.0 V), while SMAJ33A-E3/61 offers tighter V_BR (36.7–40.6 V) and lower V_C (53.3 V). Substituting SMAJ33-E3/61 for SMAJ33A-E3/61 may increase let-through voltage and reduce protection margin - verify clamping behavior under actual surge profiles before replacement.

SMAJ33-E3/61 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-214AC, SMA

Series:: TransZorb®

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 33V

Voltage - Breakdown (Min):: 36.7V

Voltage - Clamping (Max) @ Ipp:: 59V

Current - Peak Pulse (10/1000µs):: 6.8A

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)

SMAJ33-E3/61 FAQ

1.How can I place an order for SMAJ33-E3/61 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ33-E3/61 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 SMAJ33-E3/61 reliable?

The price and inventory of SMAJ33-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33-E3/61 is usually 5 days.

3.What payment methods are accepted for SMAJ33-E3/61?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33-E3/61 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ33-E3/61?

SMAJ33-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ33-E3/61 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 SMAJ33-E3/61?

For technical support, including SMAJ33-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33-E3/61 requirements.

6.How does Aetrix verify that SMAJ33-E3/61 is sourced from the original manufacturer or authorized distributors?

All SMAJ33-E3/61 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 SMAJ33-E3/61 meets industry standards.

7.What is the process for return or replacement of SMAJ33-E3/61?

All SMAJ33-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33-E3/61, 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 SMAJ33-E3/61 part is unused and in its original packaging.

Return procedure for SMAJ33-E3/61:

1.Submit a request within 90 days.

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

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