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

Vishay General Semiconductor - Diodes Division LCE28A-E3/73

Name: LCE28A-E3/73
Brand: Vishay General Semiconductor - Diodes Division
SKU: LCE28A-E3/73
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LCE28A-E3/73

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-201AA, DO-27, Axial

Datasheet:: LCE28A-E3/73.pdf

Description:: TVS DIODE 28VWM 45.5VC 1.5KE

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Product details

Overview

LCE28A-E3/73 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 28 V standoff voltage (V_WM), 31.1–34.4 V breakdown range (V_BR), 45.5 V clamping voltage at 33 A peak pulse current, 1500 W peak pulse power (10/1000 µs), and operates up to 175 °C junction temperature - deployed in industrial sensor interfaces and telecom line protection.

For engineers reviewing the LCE28A-E3/73 datasheet, LCE28A-E3/73 pinout, LCE28A-E3/73 application, or LCE28A-E3/73 equivalent, key selection criteria include verified clamping performance under 10/1000 µs surge, unidirectional polarity with cathode band marking, UL 497B listing for telecom, RoHS-compliant matte tin leads, and 1.5KE package compatibility with standard through-hole PCB layouts.

Technical Context

The LCE28A-E3/73 employs a glass-passivated silicon junction optimized for fast response (<1 ns) and low incremental surge resistance, enabling precise clamping during ESD and lightning-induced transients. Its unidirectional configuration provides reverse-biased surge suppression while maintaining low leakage (<5 µA at 28 V) in normal operation.

Rated for 1500 W peak pulse power per 10/1000 µs waveform at 0.01% duty cycle, the device derates linearly above 25 °C ambient and sustains 6.5 W steady-state power on an infinite heatsink at 75 °C lead temperature - confirming suitability for thermally constrained industrial enclosures.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	28 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 24 V systems.
V_BR (min/max)	31.1 V / 34.4 V at 1 mA - Verified breakdown threshold ensures predictable turn-on during overvoltage events.
V_C @ I_PP	45.5 V at 33 A - Clamping voltage limits downstream IC stress during 10/1000 µs surges per IEC 61000-4-5.
P_PPM	1500 W - Peak surge handling capacity supports Level 4 IEC 61000-4-5 (4 kV) protection without degradation.
Junction Temp	−65 °C to +175 °C - Enables deployment in automotive under-hood or industrial motor drive environments.
Capacitance	100 pF at 0 V - Low capacitance preserves signal integrity on data lines up to ~10 MHz bandwidth.

Pinout & Package

Package: 1.5KE molded epoxy case (Case Style 1.5KE), DO-201AD outline, RoHS-compliant matte tin-plated leads, UL 94 V-0 rated molding compound, cathode indicated by color 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	Reverse-biased surge conduction terminal	Marked with color band; connected to protected line (e.g., 24 V rail or RS-485 A/B) to clamp positive transients.

Key Features

Feature	Design Value
Glass passivation	Ensures stable V_BR and low leakage across temperature and lifetime; eliminates junction corrosion in humid environments.
1500 W peak pulse rating	Validated for repetitive 10/1000 µs surges at 0.01% duty cycle - supports long-term reliability in cyclic industrial switching noise.
UL 497B listing	Qualified for telecom primary/secondary circuit protection per ANSI/UL 497B, File E136766 - reduces certification effort for communication equipment.
Low clamping ratio	V_C/V_BR ≈ 1.42 - minimizes overvoltage overshoot relative to breakdown, protecting 30 V-rated MOSFETs and interface ICs.

Applications

Industrial Sensor Interface	Telecom Line Protection
Use Scenario: Protecting analog output (4–20 mA) and digital I/O lines of PLC modules from inductive kickback and field wiring transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground to clamp positive surges while preserving DC bias. Use Value: 45.5 V clamping ensures downstream op-amps and ADCs (e.g., ADS1115) remain below absolute maximum ratings during 1 kV/500 A surge events.	Use Scenario: Secondary-side surge protection on Ethernet PHY power rails (3.3 V, 5 V) and data pairs in enterprise switches. IC Role / Device Role / Timing Role: Standoff-rated TVS on DC bias lines feeding magnetics; used in pairs for AC-coupled differential signals. Use Value: UL 497B listing and 100 pF capacitance prevent signal distortion on 100BASE-TX while meeting EN 61000-4-5 Level 3 immunity.
24 V DC Power Rail	MOSFET Gate Driver Protection
Use Scenario: Input-stage protection for DIN-rail power supplies and motor controllers exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 24 V input bus, upstream of DC/DC converters and microcontrollers. Use Value: 28 V V_WM allows full utilization of 24 V ±10% nominal range; 1500 W rating handles ISO 16750-2 Load Dump pulses without failure.	Use Scenario: Gate protection for high-side N-channel MOSFETs in half-bridge inverters subject to shoot-through induced voltage spikes. IC Role / Device Role / Timing Role: Fast-clamping TVS between gate and source to limit V_GS excursion during Miller-induced ringing. Use Value: Sub-1 ns response time and 45.5 V clamping prevent gate oxide rupture in 600 V MOSFETs (e.g., IRFP4668) during 50 ns transient events.

Industrial Sensor Interface

Telecom Line Protection

Use Scenario: Protecting analog output (4–20 mA) and digital I/O lines of PLC modules from inductive kickback and field wiring transients.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground to clamp positive surges while preserving DC bias.

Use Value: 45.5 V clamping ensures downstream op-amps and ADCs (e.g., ADS1115) remain below absolute maximum ratings during 1 kV/500 A surge events.

Use Scenario: Secondary-side surge protection on Ethernet PHY power rails (3.3 V, 5 V) and data pairs in enterprise switches.

IC Role / Device Role / Timing Role: Standoff-rated TVS on DC bias lines feeding magnetics; used in pairs for AC-coupled differential signals.

Use Value: UL 497B listing and 100 pF capacitance prevent signal distortion on 100BASE-TX while meeting EN 61000-4-5 Level 3 immunity.

24 V DC Power Rail

MOSFET Gate Driver Protection

Use Scenario: Input-stage protection for DIN-rail power supplies and motor controllers exposed to load dump and alternator ripple.

IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 24 V input bus, upstream of DC/DC converters and microcontrollers.

Use Value: 28 V V_WM allows full utilization of 24 V ±10% nominal range; 1500 W rating handles ISO 16750-2 Load Dump pulses without failure.

Use Scenario: Gate protection for high-side N-channel MOSFETs in half-bridge inverters subject to shoot-through induced voltage spikes.

IC Role / Device Role / Timing Role: Fast-clamping TVS between gate and source to limit V_GS excursion during Miller-induced ringing.

Use Value: Sub-1 ns response time and 45.5 V clamping prevent gate oxide rupture in 600 V MOSFETs (e.g., IRFP4668) during 50 ns transient events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ28A	Same V_WM (28 V), lower P_PPM (600 W), SMC package (smaller footprint, lower thermal mass)	Better suited for space-constrained PCBs with moderate surge exposure (IEC 61000-4-2 Level 3)	Select SMBJ28A when board area is critical and peak surge energy is ≤600 W; verify thermal relief for continuous 6.5 W dissipation.
1.5KE28A	Identical electrical specs and 1.5KE package; differs only in branding and test lot traceability (Vishay LCE vs. generic 1.5KE)	No functional difference; accepted interchangeably in legacy designs qualified to MIL-STD-1547 or IPC-A-610	Choose 1.5KE28A for cost-sensitive production where Vishay LCE28A-E3/73 availability is constrained; same pinout and solder profile.

Compared with SMBJ28A and 1.5KE28A, the LCE28A-E3/73 delivers identical clamping and standoff performance in the 1.5KE package but adds UL 497B certification and JESD201 Class 1A whisker resistance - making it preferred for telecom infrastructure and long-lifecycle industrial deployments.

Availability

LCE28A-E3/73 is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and 24 V DC power rail protection requiring stable component supply and long-term manufacturability.

Supply support for LCE28A-E3/73 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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and application-specific qualification.

The LCE28A-E3/73 belongs to Vishay's TRANSZORB® low-capacitance TVS family, engineered for high-energy transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and transportation electronics.

FAQ

What is the clamping voltage of the LCE28A-E3/73 at its rated peak pulse current?

The LCE28A-E3/73 has a maximum clamping voltage (V_C) of 45.5 V at 33 A peak pulse current (I_PP) under the standardized 10/1000 µs waveform. This value is measured per Figure 3 in Vishay document 88357 and ensures protected circuits remain within safe operating limits during surge events. The LCE28A-E3/73 maintains this clamping performance across its full operating temperature range.

Is the LCE28A-E3/73 RoHS-compliant and halogen-free?

Yes, the LCE28A-E3/73 carries the "E3" suffix, indicating full compliance with RoHS Directive 2011/65/EU and JEDEC JS709A halogen-free standards. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the epoxy molding compound satisfies UL 94 V-0 flammability rating. These qualifications are documented in Vishay's material category policy and confirmed in datasheet revision 24-Sep-12.

Can the LCE28A-E3/73 be used for bidirectional transient protection?

No, the LCE28A-E3/73 is a unidirectional TVS diode and must not be used alone for AC or bidirectional signal line protection. For such applications, two LCE28A-E3/73 units must be connected in series opposition (anode-to-anode or cathode-to-cathode), as shown in Figure 4 of the datasheet. Using a single LCE28A-E3/73 in AC circuits risks failure during negative half-cycle surges.

What is the maximum operating temperature for the LCE28A-E3/73 junction?

The LCE28A-E3/73 has a maximum junction temperature (T_J) rating of +175 °C and a storage temperature range of −65 °C to +175 °C. This high-temperature capability enables use in under-hood automotive modules, industrial motor drives, and enclosed power supplies where ambient temperatures exceed 100 °C. Derating curves in Figure 2 confirm sustained operation at 6.5 W with proper heatsinking.

Does the LCE28A-E3/73 have UL certification for telecom applications?

Yes, the LCE28A-E3/73 is UL listed under file number E136766 for Telecom Application Protection per UL 497B. This certification covers both primary and secondary circuit protection in telephone network equipment, DSL modems, and VoIP gateways. The UL recognition is explicitly stated in the "Note" section of page 2 in Vishay document 88357.

LCE28A-E3/73 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-201AA, DO-27, Axial

Series:: TransZorb®

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 28V

Voltage - Breakdown (Min):: 31.1V

Voltage - Clamping (Max) @ Ipp:: 45.5V

Current - Peak Pulse (10/1000µs):: 33A

Power - Peak Pulse:: 1500W (1.5kW)

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 1.5KE

LCE28A-E3/73 FAQ

1.How can I place an order for LCE28A-E3/73 through Aetrix?

Please submit a Request for Quotation (RFQ) for LCE28A-E3/73 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 LCE28A-E3/73 reliable?

The price and inventory of LCE28A-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LCE28A-E3/73 is usually 5 days.

3.What payment methods are accepted for LCE28A-E3/73?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LCE28A-E3/73 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LCE28A-E3/73?

LCE28A-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LCE28A-E3/73 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 LCE28A-E3/73?

For technical support, including LCE28A-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LCE28A-E3/73 requirements.

6.How does Aetrix verify that LCE28A-E3/73 is sourced from the original manufacturer or authorized distributors?

All LCE28A-E3/73 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 LCE28A-E3/73 meets industry standards.

7.What is the process for return or replacement of LCE28A-E3/73?

All LCE28A-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with LCE28A-E3/73, 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 LCE28A-E3/73 part is unused and in its original packaging.

Return procedure for LCE28A-E3/73:

1.Submit a request within 90 days.

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

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