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Vishay General Semiconductor - Diodes Division LCE12A-E3/54
- Part No.:
- LCE12A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
LCE12A-E3/54.pdf
- Description:
- TVS DIODE 12VWM 19.9VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:6,696
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Product details
Overview
LCE12A-E3/54 from Vishay General Semiconductor is a unidirectional low-capacitance TRANSZORB® transient voltage suppressor (TVS) diode in the 1.5KE case style, rated for 1500 W peak pulse power (10/1000 µs), 12.0 V stand-off voltage (VWM), and 19.9 V maximum clamping voltage (VC) at 75 A peak pulse current. It protects sensitive ICs and MOSFETs against inductive switching transients and lightning surges in telecom and industrial signal lines.
For engineers reviewing the LCE12A-E3/54 datasheet, LCE12A-E3/54 pinout, LCE12A-E3/54 application, or LCE12A-E3/54 equivalent, key selection criteria include its 12.0 V VWM, 13.3–14.7 V breakdown range (VBR), 100 pF junction capacitance, 175 °C max junction temperature, and UL 497B listing for telecom surge protection.
Technical Context
This TVS diode operates as a unidirectional clamping device with glass-passivated junction construction, enabling fast response to transient overvoltages while maintaining low incremental surge resistance. Its 10/1000 µs waveform rating supports repetitive surge events at 0.01 % duty cycle, and it meets JESD 22-B106 solderability requirements (275 °C, 10 s).
The LCE12A-E3/54 features a molded epoxy body compliant with UL 94 V-0, matte tin-plated leads qualified per J-STD-002 and JESD 22-B102, and E3 suffix indicating RoHS compliance and JESD 201 Class 1A whisker resistance. Polarity is marked by a cathode band.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12.0 V - Maximum continuous reverse operating voltage before clamping begins; sets threshold for circuit protection without leakage-induced interference. |
| VBR (min/max) | 13.3 V / 14.7 V - Breakdown voltage range at 1.0 mA test current; defines guaranteed conduction onset under transient stress. |
| VC @ IPPM | 19.9 V at 75 A - Clamping voltage during 1500 W surge; determines worst-case overvoltage seen by protected downstream components. |
| Junction Capacitance | 100 pF at 0 V - Low capacitance enables use on high-speed signal lines (e.g., RS-485, CAN, USB) without signal integrity degradation. |
| TJ max | 175 °C - Maximum junction temperature rating; supports operation in harsh industrial and telecom environments with minimal derating. |
| UL Recognition | UL 497B listed (E136766) - Certified for telecom line protection applications, simplifying regulatory compliance for communication equipment designs. |
| Package | 1.5KE case style - Industry-standard axial-leaded package with 0.375" (9.5 mm) lead length; compatible with through-hole assembly and manual rework. |
Pinout & Package
Package: 1.5KE molded epoxy case with axial leads; cathode indicated by color band; RoHS-compliant matte tin plating; UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during reverse-transient clamping when cathode is at higher potential. |
| Cathode | Clamping reference terminal | Marked by color band; connected to higher-potential side (e.g., VCC or signal line); defines polarity-sensitive clamping direction. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Enables stable, repeatable breakdown characteristics and long-term reliability under repeated surge stress. |
| 1500 W peak pulse power (10/1000 µs) | Supports robust protection against high-energy transients such as lightning-induced surges on telecom lines or inductive load switching. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving clamping precision and reducing stress on protected ICs. |
| 100 pF junction capacitance | Preserves signal integrity on data lines up to ~100 MHz; suitable for RS-485, CAN, and sensor interface protection without bandwidth loss. |
| UL 497B certification | Validates suitability for telecom primary/secondary circuit protection, reducing design validation effort for certified equipment. |
Applications
| Telecom Line Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting analog and digital signal lines (e.g., T1/E1, xDSL, POTS) from lightning-induced surges and AC power cross-talk in central office and remote terminal equipment. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and ground or supply rail to limit transient voltage to safe levels. Use Value: UL 497B listing and 1500 W surge capability ensure compliance and reliability in telecom infrastructure with minimal board space. |
Use Scenario: Safeguarding 4–20 mA current-loop sensors and RS-485 transceivers in factory automation systems exposed to motor drive noise and relay switching transients. IC Role / Device Role / Timing Role: Standoff-clamp TVS mounted across differential bus lines or single-ended sensor outputs to absorb inductive kickback. Use Value: 12.0 V VWM matches common industrial supply rails; 100 pF capacitance avoids distortion of slow analog signals and digital timing margins. |
| Power Supply Input Protection | Automotive Body Control Module |
Use Scenario: Secondary-side transient suppression on DC-DC converter outputs feeding microcontrollers and memory in embedded systems. IC Role / Device Role / Timing Role: Clamp diode placed between regulated output and ground to shunt surge energy away from downstream logic and analog circuitry. Use Value: 175 °C TJ max and 6.5 W steady-state power dissipation support operation in thermally constrained enclosures without forced cooling. |
Use Scenario: Protecting LIN bus and low-voltage sensor inputs (e.g., temperature, humidity) in automotive body control modules from battery dump and load-dump events. IC Role / Device Role / Timing Role: Unidirectional TVS installed on each signal line referenced to chassis ground to clamp negative-going transients below system ground. Use Value: E3 suffix ensures RoHS compliance and whisker resistance required for automotive production; 1.5KE package allows manual rework in low-volume assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | DO-214AA (SMB) package; same 12 V VWM, but lower 600 W PPPM rating and 23.2 V VC at 26.1 A IPPM. | Surface-mount only; better suited for space-constrained PCBs but lacks UL 497B listing and axial-leaded mechanical robustness. | Select SMBJ12A when board area is limited and telecom certification is not required; verify thermal relief for sustained surge duty. |
| 1.5KE12A | Same 1.5KE package and electrical specs, but non-RoHS (no E3 suffix); identical VWM, VBR, VC, and PPPM ratings. | No JESD 201 whisker qualification; not approved for high-reliability or export-controlled applications requiring RoHS compliance. | Choose 1.5KE12A only for legacy industrial repairs where RoHS is waived; otherwise prefer LCE12A-E3/54 for new designs. |
Compared with SMBJ12A and 1.5KE12A, the LCE12A-E3/54 uniquely combines UL 497B certification, RoHS + whisker resistance, and full 1500 W surge capability in an axial-leaded 1.5KE package-making it optimal for certified telecom hardware and automotive-qualified industrial controls.
Availability
LCE12A-E3/54 is available at Aetrix Electronics and suitable for telecom line protection, industrial sensor interface hardening, and automotive body control module designs requiring stable component supply, long-lifecycle availability, and traceable RoHS-compliant sourcing.
Supply support for LCE12A-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, TVS devices, and optoelectronics with emphasis on reliability, surge robustness, and industry certifications.
The LCE series belongs to Vishay's low-capacitance TRANSZORB® TVS family, engineered specifically for high-speed signal line protection in telecom, industrial automation, and automotive electronics where clamping precision and regulatory compliance are critical.
FAQ
What is the clamping voltage of the LCE12A-E3/54 under a 1500 W transient?
The LCE12A-E3/54 clamps to a maximum of 19.9 V when subjected to its rated 1500 W peak pulse power (10/1000 µs waveform) at 75 A peak pulse current. This value is measured per Figure 3 in the official Vishay datasheet (Document Number: 88357) and represents the worst-case voltage imposed on protected circuitry during surge events. The LCE12A-E3/54 maintains this clamping performance across its specified operating temperature range.
Is the LCE12A-E3/54 suitable for bidirectional signal line protection?
No - the LCE12A-E3/54 is a unidirectional TVS diode, designed to clamp only negative-going transients relative to its cathode. For AC or bidirectional signal lines (e.g., RS-485, Ethernet PHY), two LCE12A-E3/54 units must be used in parallel with opposite polarity, as shown in Figure 4 of the Vishay datasheet. Using a single LCE12A-E3/54 on bidirectional lines leaves positive transients unprotected.
Does the LCE12A-E3/54 meet RoHS and halogen-free requirements?
Yes - the "E3" suffix confirms that the LCE12A-E3/54 is RoHS-compliant per Directive 2011/65/EU and qualified to JESD 201 Class 1A for tin whisker resistance. While the datasheet does not explicitly state halogen-free status for the LCE12A-E3/54, Vishay's Material Category Policy confirms all E3-suffix products meet JEDEC JS709A halogen-free standards unless otherwise noted.
What is the maximum operating temperature for the LCE12A-E3/54 junction?
The LCE12A-E3/54 has a maximum junction temperature (TJ) of +175 °C, allowing reliable operation in high-ambient environments such as enclosed industrial controllers or under-hood automotive modules. Derating begins above 25 °C ambient per the power derating curve in Figure 2 of the Vishay datasheet, with 6.5 W power dissipation rated at TL = 75 °C on an infinite heatsink.
How is polarity identified on the LCE12A-E3/54 package?
Polarity is marked by a color band on the cathode end of the LCE12A-E3/54's axial-leaded 1.5KE package. During PCB layout or manual assembly, the banded end must be connected to the higher-potential node (e.g., VCC, signal line, or telecom tip/ring) to ensure correct unidirectional clamping action. Reversing polarity renders the LCE12A-E3/54 ineffective against standard negative transients.
LCE12A-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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 75A
- 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
LCE12A-E3/54 FAQ
1.How can I place an order for LCE12A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for LCE12A-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 LCE12A-E3/54 reliable?
The price and inventory of LCE12A-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 LCE12A-E3/54 is usually 5 days.
3.What payment methods are accepted for LCE12A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LCE12A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LCE12A-E3/54?
LCE12A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LCE12A-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 LCE12A-E3/54?
For technical support, including LCE12A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LCE12A-E3/54 requirements.
6.How does Aetrix verify that LCE12A-E3/54 is sourced from the original manufacturer or authorized distributors?
All LCE12A-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 LCE12A-E3/54 meets industry standards.
7.What is the process for return or replacement of LCE12A-E3/54?
All LCE12A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with LCE12A-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 LCE12A-E3/54 part is unused and in its original packaging.
Return procedure for LCE12A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LCE12A-E3/54 Tags
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