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Vishay General Semiconductor - Diodes Division 1.5KE6.8A-E3/51
- Part No.:
- 1.5KE6.8A-E3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE6.8A-E3/51.pdf
- Description:
- TVS DIODE 5.8VWM 10.5VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:5,621
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Product details
Overview
1.5KE6.8A-E3/51 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 6.45 V to 7.14 V breakdown voltage (VBR) at 10 mA, 5.80 V maximum working peak reverse voltage (VWM), 1000 µA maximum reverse leakage at VWM, 10.5 V clamping voltage (VC) at 143 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used in automotive sensor interface protection and industrial I/O circuitry.
For engineers reviewing the 1.5KE6.8A-E3/51 datasheet, 1.5KE6.8A-E3/51 pinout, 1.5KE6.8A-E3/51 application, or 1.5KE6.8A-E3/51 equivalent, this part delivers verified transient suppression for 5 V–12 V systems where fast response (<1 ns), low clamping ratio (VC/VBR ≈ 1.55), and AEC-Q101-qualified variants are critical selection criteria.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: it remains high-impedance below VWM (5.80 V), enters avalanche conduction at VBR (min 6.45 V), and clamps transients to ≤10.5 V at 143 A. Its glass-passivated junction enables stable breakdown and low incremental surge resistance.
It complies with JEDEC standard test conditions (10/1000 µs waveform, 0.01% duty cycle), supports 200 A non-repetitive forward surge current (8.3 ms half-sine), and exhibits a +0.057 %/°C temperature coefficient of VBR - enabling predictable performance across -55 °C to +175 °C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 6.45 V / 7.14 V at 10 mA - defines precise avalanche onset threshold for reliable triggering in 5 V–6 V rail protection |
| VWM | 5.80 V - maximum continuous reverse voltage before leakage exceeds 1000 µA; ensures no conduction during normal 5 V operation |
| VC @ IPPM | 10.5 V at 143 A - clamping voltage limits downstream IC stress to safe levels during lightning or ESD events |
| PPPM | 1500 W - peak pulse power handling capability with 10/1000 µs waveform supports industrial-grade surge immunity |
| IPPM | 143 A - peak pulse current capacity determines survivability against IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) |
| TJ max. | +175 °C - high junction temperature rating enables use in under-hood automotive or enclosed industrial enclosures |
| RθJA | 75 °C/W - thermal resistance informs heatsinking requirements when operating near PD = 6.5 W derated limit |
Pinout & Package
Package: DO-201AD (Case Style 1.5KE), axial-leaded, molded epoxy body with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102. Cathode identified by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest-potential node; completes clamping path during transient |
| Cathode (banded end) | High-side transient input terminal | Connected to protected line (e.g., 5 V rail); avalanche conduction initiates here during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage and long-term reliability under repetitive surge stress |
| 1500 W peak pulse power (10/1000 µs) | Supports EN 61000-4-5 compliance for industrial equipment up to 4 kV line-to-line surge testing |
| Clamping ratio VC/VBR ≈ 1.55 | Minimizes overvoltage overshoot on protected ICs - critical for 5 V logic and USB PHY interfaces |
| Response time < 1 ns | Engages before most semiconductor damage mechanisms initiate, protecting MOSFET gates and microcontroller I/O |
| AEC-Q101 qualified variants available | Enables drop-in qualification for automotive applications (e.g., body control modules, sensor nodes) |
Applications
| Automotive Sensor Interface | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between sensor signal line and chassis ground, triggered within <1 ns to limit voltage to ≤10.5 V. Use Value: Prevents latch-up or gate oxide rupture in 5 V CMOS front-end amplifiers and ADC drivers exposed to ISO 7637-2 Pulse 5a (75 V/200 ms). |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers against field-wiring induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Primary protection device mounted at connector entry point, clamping transients before they reach optocoupler input stage. Use Value: Enables robust operation per IEC 61000-4-4 (electrical fast transients) and IEC 61000-4-5 (surge) without additional series impedance or filtering. |
| Consumer Power Adapter Output | Telecom Line Card Protection |
Use Scenario: Secondary-side overvoltage suppression on 5 V/9 V/12 V USB-C PD adapter outputs to prevent damage during feedback loop failure or cable short-circuit events. IC Role / Device Role / Timing Role: Fast-acting crowbar element placed between output rail and ground, conducting only during fault conditions above 6.45 V. Use Value: Limits fault voltage to 10.5 V, protecting connected devices' USB-PD controllers and Type-C port protection ICs from catastrophic overvoltage. |
Use Scenario: Front-end protection for Ethernet PHYs and DSL line drivers exposed to lightning-induced surges on outdoor telecom wiring. IC Role / Device Role / Timing Role: First-stage shunt suppressor on line-side transformer secondary, absorbing energy before it reaches integrated line driver ICs. Use Value: Withstands 1500 W pulses per ITU-T K.20/K.21, reducing need for multi-stage protection and lowering BOM cost vs. GDT+TVS hybrid solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.8A | DO-214AA package (smaller footprint), 600 W PPPM, VC = 11.2 V @ 53.3 A - lower power, higher clamping voltage | Better suited for space-constrained PCBs with moderate surge requirements (IEC 61000-4-5 Level 2) | Select SMBJ6.8A when board area is limited and peak surge current is ≤60 A; retains same VBR range but requires layout revision. |
| 1.5KE6.8CA | Bidirectional variant (no polarity marking), identical VBR/VC/PPPM, symmetric clamping in both directions | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs | Choose 1.5KE6.8CA only if protecting bidirectional data lines; unidirectional 1.5KE6.8A-E3/51 is optimal for DC rails and single-ended signals. |
Compared with SMBJ6.8A, 1.5KE6.8A-E3/51 offers 2.5× higher surge power and lower clamping voltage for critical 5 V rail protection; versus 1.5KE6.8CA, it provides tighter leakage control and simpler polarity-aware placement in DC systems.
Availability
1.5KE6.8A-E3/51 is available at Aetrix Electronics and suitable for automotive sensor interface, industrial PLC digital input, and consumer power adapter output applications requiring stable component supply, RoHS-compliant sourcing, and traceable manufacturing history.
Supply support for 1.5KE6.8A-E3/51 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 power MOSFETs with emphasis on reliability, ruggedness, and automotive qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 1500 W surge handling and AEC-Q101 compliance are mandatory design requirements.
FAQ
What is the breakdown voltage tolerance of the 1.5KE6.8A-E3/51?
The 1.5KE6.8A-E3/51 has a guaranteed breakdown voltage range of 6.45 V to 7.14 V at 10 mA test current, representing ±5% tolerance around the nominal 6.8 V rating. This tight VBR window ensures consistent triggering behavior across production lots and allows precise coordination with downstream overvoltage lockout thresholds in protected circuits. The 1.5KE6.8A-E3/51 maintains this specification under JEDEC-standard test conditions and is validated per Vishay Document Number 88301.
Is the 1.5KE6.8A-E3/51 RoHS compliant and lead-free?
Yes, the 1.5KE6.8A-E3/51 carries the "E3" suffix, indicating full RoHS compliance per Directive 2011/65/EU and exemption 6(c)-IV, with lead content below 1000 ppm and matte tin-plated leads meeting J-STD-002 solderability requirements. It also passes JESD 201 Class 1A whisker testing. The 1.5KE6.8A-E3/51 is rated for commercial temperature range (-55 °C to +175 °C) and is not AEC-Q101 qualified - that designation requires the "HE3" suffix variant.
How does the clamping voltage of the 1.5KE6.8A-E3/51 compare to its breakdown voltage?
The 1.5KE6.8A-E3/51 clamps at 10.5 V when subjected to its rated 143 A peak pulse current (10/1000 µs waveform), yielding a clamping ratio (VC/VBR) of approximately 1.55 using the minimum VBR of 6.45 V. This low ratio reflects efficient avalanche conduction and minimal incremental surge resistance, directly limiting stress on downstream 5 V ICs. The 1.5KE6.8A-E3/51 achieves this performance while maintaining sub-1 ns response time and stable thermal characteristics up to 175 °C junction temperature.
Can the 1.5KE6.8A-E3/51 be used in bidirectional signal protection?
No - the 1.5KE6.8A-E3/51 is a unidirectional TVS diode, with cathode marked by a band and intended for DC rail or single-polarity signal line protection. For bidirectional applications such as RS-485, CAN, or AC-coupled audio, the 1.5KE6.8CA variant must be used instead. Using the 1.5KE6.8A-E3/51 on bidirectional lines risks forward conduction during negative excursions, potentially causing malfunction or damage. The 1.5KE6.8A-E3/51 datasheet explicitly restricts bidirectional operation to CA-suffix parts only.
What is the maximum allowable mounting temperature for soldering the 1.5KE6.8A-E3/51?
The 1.5KE6.8A-E3/51 supports solder dip at 275 °C maximum for 10 seconds per JESD 22-B106, and reflow profiles must comply with IPC/JEDEC J-STD-020. Its matte tin-plated leads meet J-STD-002 for solderability, and the epoxy molding compound is UL 94 V-0 rated. Exceeding 275 °C or extending dwell time beyond 10 s risks internal bond wire damage or delamination. The 1.5KE6.8A-E3/51 thermal resistance values (RθJA = 75 °C/W, RθJL = 15.4 °C/W) assume proper lead-to-PCB thermal coupling during operation, not soldering.
1.5KE6.8A-E3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5.8V
- Voltage - Breakdown (Min):
- 6.45V
- Voltage - Clamping (Max) @ Ipp:
- 10.5V
- Current - Peak Pulse (10/1000µs):
- 143A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE6.8A-E3/51 FAQ
1.How can I place an order for 1.5KE6.8A-E3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE6.8A-E3/51 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 1.5KE6.8A-E3/51 reliable?
The price and inventory of 1.5KE6.8A-E3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE6.8A-E3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE6.8A-E3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE6.8A-E3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE6.8A-E3/51?
1.5KE6.8A-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE6.8A-E3/51 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 1.5KE6.8A-E3/51?
For technical support, including 1.5KE6.8A-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE6.8A-E3/51 requirements.
6.How does Aetrix verify that 1.5KE6.8A-E3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE6.8A-E3/51 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 1.5KE6.8A-E3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE6.8A-E3/51?
All 1.5KE6.8A-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE6.8A-E3/51, 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 1.5KE6.8A-E3/51 part is unused and in its original packaging.
Return procedure for 1.5KE6.8A-E3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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