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Vishay General Semiconductor - Diodes Division 1.5KE6.8AHE3/51
- Part No.:
- 1.5KE6.8AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE6.8AHE3/51.pdf
- Description:
- TVS DIODE 5.8VWM 10.5VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:5,212
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Product details
Overview
1.5KE6.8AHE3/51 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 6.45 V minimum breakdown voltage (VBR), 5.80 V maximum stand-off voltage (VWM), 1000 µA maximum reverse leakage at VWM, 143 A peak pulse current (IPPM), and clamps transients to 10.5 V at rated surge - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the 1.5KE6.8AHE3/51 datasheet, 1.5KE6.8AHE3/51 pinout, 1.5KE6.8AHE3/51 application, or 1.5KE6.8AHE3/51 equivalent, this part delivers AEC-Q101 qualification, 1500 W 10/1000 µs peak pulse power, glass-passivated junction reliability, RoHS-compliant matte tin leads, and UL 94 V-0 molded epoxy packaging - critical for automotive-grade transient suppression where clamping voltage margin and surge robustness are design-determining.
Technical Context
The 1.5KE6.8AHE3/51 operates as a uni-directional avalanche diode with cathode-band polarity marking, leveraging silicon junction physics to clamp voltage surges before downstream ICs exceed absolute maximum ratings. Its 10.5 V clamping voltage at 143 A ensures MOSFET gate drivers and microcontroller I/O remain below 12 V during ESD or load-switching events.
Thermal performance is defined by 15.4 °C/W junction-to-lead resistance and 75 °C/W junction-to-ambient resistance, enabling reliable operation up to 175 °C junction temperature. The device sustains 200 A non-repetitive forward surge (8.3 ms half-sine) and exhibits 0.057 %/°C temperature coefficient of VBR, ensuring stable threshold behavior across automotive thermal profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 6.45 V - guaranteed avalanche initiation voltage at 10 mA test current; sets lower bound for protection threshold |
| VWM | 5.80 V - maximum continuous reverse operating voltage; must exceed system nominal DC rail (e.g., 5 V logic) |
| IPPM | 143 A - peak current it safely shunts during 10/1000 µs transient; determines PCB trace width and fuse coordination |
| VC | 10.5 V - clamped voltage at IPPM; defines maximum stress on protected circuitry during worst-case surge |
| PPPM | 1500 W - peak pulse power handling capability; enables protection against lightning-induced surges per IEC 61000-4-5 |
| TJ max | 175 °C - maximum junction temperature; supports under-hood automotive placement without derating penalties |
| AEC-Q101 | Qualified - validated for automotive electronics per stress-test standard; required for engine control, body modules |
Pinout & Package
Package: Case Style 1.5KE - axial-leaded DO-201AD molded epoxy package with matte tin-plated leads, UL 94 V-0 flammability rating, and 0.375" (9.5 mm) lead length. Dimensions: 5.3 mm diameter × 9.5 mm length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side return path in uni-directional configuration; carries full surge current during clamping |
| Cathode | Reverse-biased clamping terminal | Marked with color band; connected to protected line (e.g., 5 V rail); initiates avalanche when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable, repeatable avalanche characteristics over 1000+ surge events 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 single-device configurations |
| AEC-Q101 qualification | Validated for automotive under-hood environments including temperature cycling, humidity bias, and mechanical shock |
| UL 94 V-0 epoxy molding | Prevents flame propagation during catastrophic failure, meeting automotive and industrial safety standards |
| 0.057 %/°C VBR tempco | Ensures <±0.5 V shift over -40 °C to +125 °C ambient, preserving protection margin across full vehicle operating range |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Primary clamping device placed directly at connector entry point to limit voltage seen by LDO regulators and MCU power pins. Use Value: Clamps to 10.5 V within <1 ns, preventing latch-up or oxide rupture in 5 V/3.3 V logic while surviving 1500 W surges. |
Use Scenario: 4–20 mA current loop sensors in factory automation subject to cable ESD and inductive kickback. IC Role / Device Role / Timing Role: Uni-directional TVS mounted across sensor output terminals to shunt transients before analog front-end op-amps. Use Value: 5.80 V VWM allows safe operation above 4–20 mA loop compliance voltage; 10.5 V VC protects precision ADC inputs. |
| Consumer USB Port Surge Protection | Telecom DSL Line Interface Protection |
Use Scenario: USB 2.0 VBUS line in portable chargers and docking stations subjected to hot-plug contact bounce and ESD. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between USB connector and power switch FET to absorb 8 kV HBM ESD events. Use Value: 1000 µA leakage at 5.80 V avoids loading USB suspend current budget; fast response prevents data corruption. |
Use Scenario: DSL line cards interfacing twisted-pair copper lines vulnerable to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Paired uni-directional TVS devices (one per line) referenced to chassis ground to clamp differential and common-mode transients. Use Value: 143 A IPPM handles 10/1000 µs surges up to 1.5 kV; AEC-Q101 grade ensures long-term field reliability in telco cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.8A | DO-214AA package (SMB), 600 W PPPM, 10.5 V VC, same VBR/VWM range | Lower surge rating; suited for space-constrained PCBs where 1500 W is not required | Select SMBJ6.8A only if board layout restricts axial-leaded components and system-level surge testing is ≤ Level 3 (2 kV) |
| 1.5KE6.8CA | Bi-directional variant, identical package and PPPM, but symmetric ±6.45 V VBR and no polarity marking | Required for AC-coupled or bidirectional signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs | Choose 1.5KE6.8CA only when protecting balanced differential pairs or ungrounded AC signals; not interchangeable in DC rail applications |
Compared with SMBJ6.8A and 1.5KE6.8CA, the 1.5KE6.8AHE3/51 uniquely combines AEC-Q101 qualification, 1500 W surge capacity, and axial DO-201AD form factor - making it the sole choice for high-reliability automotive DC power rail protection where both mechanical robustness and regulatory compliance are mandatory.
Availability
1.5KE6.8AHE3/51 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interface modules, and telecom line card designs requiring stable component supply with AEC-Q101 validation and long-lifecycle support.
Supply support for 1.5KE6.8AHE3/51 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The 1.5KE series was engineered specifically for high-energy transient suppression in harsh environments, targeting automotive power systems and industrial equipment where failure modes demand proven surge endurance and thermal stability.
FAQ
What is the clamping voltage of the 1.5KE6.8AHE3/51 at its rated peak pulse current?
The 1.5KE6.8AHE3/51 clamps to a maximum of 10.5 V at its rated peak pulse current of 143 A (10/1000 µs waveform). This value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. Designers use this parameter to verify that downstream components - such as 5 V microcontrollers or 3.3 V level translators - remain within their absolute maximum voltage ratings during clamping action.
Is the 1.5KE6.8AHE3/51 suitable for automotive applications?
Yes, the 1.5KE6.8AHE3/51 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its 175 °C maximum junction temperature, glass-passivated junction, and UL 94 V-0 epoxy package meet stringent automotive reliability requirements. The HE3 suffix confirms RoHS compliance and AEC-Q101 qualification per Vishay's documentation - making the 1.5KE6.8AHE3/51 appropriate for engine control units, body electronics, and ADAS power supplies.
How does the 1.5KE6.8AHE3/51 differ from the bi-directional 1.5KE6.8CA variant?
The 1.5KE6.8AHE3/51 is uni-directional with cathode-band polarity marking and specified parameters for reverse-biased operation only, while the 1.5KE6.8CA is bi-directional with symmetric breakdown in both polarities and no polarity marking. Their VBR, VC, and PPPM values are identical, but the 1.5KE6.8AHE3/51 cannot protect AC or reversible signal paths. Substituting one for the other requires verifying circuit polarity and grounding topology - they are not functionally interchangeable.
What is the maximum reverse leakage current of the 1.5KE6.8AHE3/51 at its stand-off voltage?
The 1.5KE6.8AHE3/51 exhibits a maximum reverse leakage current (ID) of 1000 µA at its rated stand-off voltage (VWM) of 5.80 V, measured at 25 °C. This leakage value remains stable over temperature and does not degrade with repeated surge events due to the glass-passivated junction. It is low enough to avoid loading typical 5 V logic rails or sensor reference voltages, but must be accounted for in ultra-low-power sleep-mode designs.
Does the 1.5KE6.8AHE3/51 require a heatsink for standard operation?
No, the 1.5KE6.8AHE3/51 does not require an external heatsink for transient suppression duty cycles (e.g., 0.01 % duty cycle per JEDEC). Its thermal resistance is 15.4 °C/W junction-to-lead, and it is rated for 6.5 W steady-state power dissipation only when mounted on an infinite heatsink at 75 °C lead temperature. In normal TVS operation - which involves brief, infrequent surges - heat is dissipated through the PCB copper and leads without additional thermal management.
1.5KE6.8AHE3/51 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE6.8AHE3/51 FAQ
1.How can I place an order for 1.5KE6.8AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE6.8AHE3/51 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 1.5KE6.8AHE3/51 reliable?
The price and inventory of 1.5KE6.8AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE6.8AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE6.8AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE6.8AHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE6.8AHE3/51?
1.5KE6.8AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE6.8AHE3/51 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 1.5KE6.8AHE3/51?
For technical support, including 1.5KE6.8AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE6.8AHE3/51 requirements.
6.How does Aetrix verify that 1.5KE6.8AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE6.8AHE3/51 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 1.5KE6.8AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE6.8AHE3/51?
All 1.5KE6.8AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE6.8AHE3/51, 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 1.5KE6.8AHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE6.8AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE6.8AHE3/51 Tags
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Diodes Incorporated
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Diodes Incorporated
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