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

Vishay General Semiconductor - Diodes Division LCE28A-E3/54

Name: LCE28A-E3/54
Brand: Vishay General Semiconductor - Diodes Division
SKU: LCE28A-E3/54
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LCE28A-E3/54

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

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

Datasheet:: LCE28A-E3/54.pdf

Description:: TVS DIODE 28VWM 45.5VC 1.5KE

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Product details

Overview

LCE28A-E3/54 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 28 V stand-off voltage (V_WM), 31.1–34.4 V breakdown range (V_BR), 45.5 V maximum 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 signal lines and MOSFET gate protection.

For engineers reviewing the LCE28A-E3/54 datasheet, LCE28A-E3/54 pinout, LCE28A-E3/54 application, or LCE28A-E3/54 equivalent, key selection criteria include unidirectional clamping performance, 1.5KE package thermal derating behavior, low incremental surge resistance, and UL 497B listing for telecom surge protection compliance.

Technical Context

The LCE28A-E3/54 uses a glass-passivated silicon junction for stable, repeatable avalanche clamping under transient stress. Its 10/1000 µs waveform response delivers 1500 W peak pulse power with 0.01 % duty cycle repeatability and exhibits <1 ns intrinsic response time due to low-junction-capacitance design (100 pF at 0 V).

It operates as a unidirectional device with cathode marked by color band, rated for -65 °C to +175 °C junction temperature, and supports soldering per J-STD-002 and JESD 22-B102 with matte tin-plated leads - validated for use in AC line protection when paired with reverse-polarity counterpart per Fig. 4.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	28 V - Maximum continuous reverse operating voltage before leakage exceeds 5 µA; defines safe signal line bias margin.
V_BR (min/max)	31.1 V / 34.4 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients.
V_C @ I_PP	45.5 V at 33 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level.
P_PPM	1500 W - Peak transient energy handling capacity; enables protection against lightning-induced surges per IEC 61000-4-5.
Junction capacitance	100 pF at 0 V - Low enough to avoid signal integrity degradation on 1–10 MHz sensor or data lines.
T_J max.	175 °C - Enables operation in high-ambient industrial enclosures without thermal shutdown.

Pinout & Package

Package: Case Style 1.5KE - molded epoxy body meeting UL 94 V-0 flammability rating; 0.375" (9.5 mm) lead length; RoHS-compliant E3 suffix with JESD 201 Class 1A whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential side (e.g., ground or return path) in unidirectional clamp configuration.
Cathode	Avalanche clamping terminal	Marked by color band; connected to protected line; conducts during positive transients above V_BR.

Key Features

Feature	Design Value
Glass passivated junction	Ensures stable V_BR tolerance and long-term reliability under repeated surge stress without parameter drift.
1500 W peak pulse power (10/1000 µs)	Supports Level 4 IEC 61000-4-5 surge immunity (4 kV line-to-earth) in properly filtered front-end designs.
UL 497B listed	Validated for telecom interface protection including POTS, DSL, and T1/E1 line cards without additional certification.
Low incremental surge resistance	Minimizes V_C overshoot during fast-rising transients, improving clamping precision for MOSFET gate protection.

Applications

Industrial Sensor Signal Protection	DC Power Rail Clamp
Use Scenario: Protecting analog output lines (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors from inductive switching spikes in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and ground, triggered only during positive overvoltage events. Use Value: Limits transient voltage to ≤45.5 V, preventing damage to downstream ADC inputs or op-amp buffers while maintaining signal fidelity.	Use Scenario: Clamping voltage surges on 24 V DC input rails feeding PLC I/O modules exposed to relay coil back-EMF. IC Role / Device Role / Timing Role: Standoff-rated protector (28 V) that remains non-conductive during normal operation but clamps within nanoseconds during >31.1 V transients. Use Value: Absorbs up to 1500 W surge energy without failure, preserving rail stability and avoiding brownout resets in embedded controllers.
MOSFET Gate Protection	Telecom Line Interface
Use Scenario: Safeguarding N-channel MOSFET gates driven by microcontrollers in motor driver H-bridges subjected to load dump or shoot-through recovery spikes. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp between gate and source, suppressing positive gate-source overvoltage beyond safe V_GS limits. Use Value: Prevents gate oxide rupture by limiting V_GS to ≤45.5 V during 33 A transient events, extending MOSFET lifetime in harsh environments.	Use Scenario: Primary surge protection on RJ-11 telephone line interfaces in VoIP gateways and PBX systems compliant with UL 497B. IC Role / Device Role / Timing Role: Telecom-certified unidirectional TVS used in pair with reverse-polarity unit for full AC line protection per Fig. 4 schematic. Use Value: Meets UL 497B requirements for telecom surge immunity without external varistors or gas discharge tubes, reducing BOM count.

Industrial Sensor Signal Protection

DC Power Rail Clamp

Use Scenario: Protecting analog output lines (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors from inductive switching spikes in factory automation cabinets.

IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and ground, triggered only during positive overvoltage events.

Use Value: Limits transient voltage to ≤45.5 V, preventing damage to downstream ADC inputs or op-amp buffers while maintaining signal fidelity.

Use Scenario: Clamping voltage surges on 24 V DC input rails feeding PLC I/O modules exposed to relay coil back-EMF.

IC Role / Device Role / Timing Role: Standoff-rated protector (28 V) that remains non-conductive during normal operation but clamps within nanoseconds during >31.1 V transients.

Use Value: Absorbs up to 1500 W surge energy without failure, preserving rail stability and avoiding brownout resets in embedded controllers.

MOSFET Gate Protection

Telecom Line Interface

Use Scenario: Safeguarding N-channel MOSFET gates driven by microcontrollers in motor driver H-bridges subjected to load dump or shoot-through recovery spikes.

IC Role / Device Role / Timing Role: Fast-response unidirectional clamp between gate and source, suppressing positive gate-source overvoltage beyond safe V_GS limits.

Use Value: Prevents gate oxide rupture by limiting V_GS to ≤45.5 V during 33 A transient events, extending MOSFET lifetime in harsh environments.

Use Scenario: Primary surge protection on RJ-11 telephone line interfaces in VoIP gateways and PBX systems compliant with UL 497B.

IC Role / Device Role / Timing Role: Telecom-certified unidirectional TVS used in pair with reverse-polarity unit for full AC line protection per Fig. 4 schematic.

Use Value: Meets UL 497B requirements for telecom surge immunity without external varistors or gas discharge tubes, reducing BOM count.

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), SMB package (smaller footprint, lower thermal mass)	Lower surge energy handling; suitable for board-level ESD rather than lightning-level transients	Select SMBJ28A only if system-level surge testing is limited to IEC 61000-4-2 (ESD), not IEC 61000-4-5 (surge)
1.5KE28A	Identical electrical specs and 1.5KE package; differs only in branding and traceability - Vishay LCE28A-E3/54 is direct replacement per ordering code cross-reference	No functional difference; same UL 497B listing and thermal profile	1.5KE28A is legacy marking; LCE28A-E3/54 offers enhanced RoHS compliance (E3 suffix) and JESD 201 Class 1A whisker resistance

Compared with SMBJ28A and 1.5KE28A, the LCE28A-E3/54 provides identical surge capability and package form factor as 1.5KE28A but with verified whisker-resistant terminations and updated RoHS documentation, while offering significantly higher peak power than SMBJ28A for infrastructure-grade protection.

Availability

LCE28A-E3/54 is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line cards, and DC power rail protection requiring stable component supply across multi-year production cycles.

Supply support for LCE28A-E3/54 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, power handling, and industry certifications.

The LCE series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in industrial, telecom, and automotive subsystems where UL recognition and thermal robustness are mandatory.

FAQ

What is the clamping voltage of the LCE28A-E3/54 under a 10/1000 µs surge?

The LCE28A-E3/54 has a maximum clamping voltage (V_C) of 45.5 V at 33 A peak pulse current under the standard 10/1000 µs waveform. This value is measured per Figure 3 in the Vishay datasheet 88357 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.

Is the LCE28A-E3/54 suitable for bidirectional signal line protection?

No - the LCE28A-E3/54 is a unidirectional TVS diode, intended for DC-biased or single-polarity lines. For AC or bidirectional signal protection (e.g., RS-485, telephone lines), two LCE28A-E3/54 units must be used in parallel with opposite polarity, as shown in Figure 4 of the datasheet.

Does the LCE28A-E3/54 meet UL 497B requirements for telecom surge protection?

Yes - the LCE28A-E3/54 is UL listed under file E136766 for Telecom Application Protection per UL 497B. This certification covers its use in primary protection circuits for telephone line interfaces, including POTS and DSL equipment, without requiring additional external components.

What is the meaning of the "E3/54" suffix in LCE28A-E3/54?

The "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads qualified to JESD 201 Class 1A whisker testing. The "/54" indicates packaging in 13-inch diameter paper tape and reel, with a base quantity of 1400 units per reel - confirmed in the Ordering Information section of datasheet 88357.

Can the LCE28A-E3/54 replace the 1.5KE28A in existing designs?

Yes - the LCE28A-E3/54 is electrically and mechanically identical to 1.5KE28A, sharing the same 1.5KE case style, V_WM, V_BR, V_C, and P_PPM. The LCE28A-E3/54 adds enhanced process controls (E3 suffix) but requires no PCB layout changes or requalification for drop-in replacement.

LCE28A-E3/54 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

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

Series:: TransZorb®

Packaging:: Tape & Reel (TR)

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-E3/54 FAQ

1.How can I place an order for LCE28A-E3/54 through Aetrix?

Please submit a Request for Quotation (RFQ) for LCE28A-E3/54 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-E3/54 reliable?

The price and inventory of LCE28A-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LCE28A-E3/54 is usually 5 days.

3.What payment methods are accepted for LCE28A-E3/54?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LCE28A-E3/54 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LCE28A-E3/54?

LCE28A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LCE28A-E3/54 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-E3/54?

For technical support, including LCE28A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LCE28A-E3/54 requirements.

6.How does Aetrix verify that LCE28A-E3/54 is sourced from the original manufacturer or authorized distributors?

All LCE28A-E3/54 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-E3/54 meets industry standards.

7.What is the process for return or replacement of LCE28A-E3/54?

All LCE28A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with LCE28A-E3/54, 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-E3/54 part is unused and in its original packaging.

Return procedure for LCE28A-E3/54:

1.Submit a request within 90 days.

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

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