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Vishay General Semiconductor - Diodes Division 1.5KA6.8HE3/51
- Part No.:
- 1.5KA6.8HE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA6.8HE3/51.pdf
- Description:
- TVS DIODE 5.5VWM 10.8VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:8,946
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Product details
Overview
1.5KA6.8HE3/51 from Vishay General Semiconductor is a unidirectional automotive-grade transient voltage suppressor (TVS) diode designed for high-energy surge protection in power rails and signal lines. It delivers 1500 W peak pulse power (10/1000 µs), clamps at 10.8 V under 139 A peak pulse current, and operates across –65 °C to +185 °C junction temperature - deployed in engine control units, ABS modules, and automotive sensor interfaces.
For engineers reviewing the 1.5KA6.8HE3/51 datasheet, 1.5KA6.8HE3/51 pinout, 1.5KA6.8HE3/51 application, or 1.5KA6.8HE3/51 equivalent, key selection criteria include its AEC-Q101 qualification, 6.12–7.48 V breakdown voltage range, 5.5 V stand-off voltage, 1000 µA max reverse leakage at VWM, and 0.057 %/°C VBR temperature coefficient - all critical for robust automotive ESD and load-dump immunity design.
Technical Context
This TVS diode employs Vishay's patented PAR® construction for stable clamping under repeated surge stress and features a molded epoxy case rated UL 94 V-0. Its unidirectional polarity and cathode-band marking align with standard PCB layout conventions for DC rail protection.
Rated for 200 A non-repetitive forward surge (8.3 ms half-sine), it maintains low incremental surge resistance and fast response time - enabling effective suppression of inductive switching transients in 12 V and 24 V automotive systems without compromising signal integrity on adjacent traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - sustains single high-energy surges common in ISO 7637-2 load-dump events |
| Breakdown Voltage VBR | 6.12–7.48 V at 10 mA - ensures reliable triggering before damage to downstream 5 V or 3.3 V ICs |
| Clamping Voltage VC | 10.8 V at 139 A - limits voltage seen by protected circuit during worst-case surge |
| Stand-off Voltage VWM | 5.5 V - safely blocks normal 5 V rail operation while remaining inactive below threshold |
| Max Reverse Leakage | 1000 µA at VWM, 150 °C - low leakage preserves battery life in always-on automotive modules |
| Junction Temperature Range | –65 °C to +185 °C - supports under-hood placement in modern engine compartments |
| AEC-Q101 Qualified | Yes - validated for automotive reliability including temperature cycling, HTRB, and surge endurance |
Pinout & Package
Case Style 1.5KA: axial-lead DO-201AD package with matte tin-plated leads; cathode indicated by color band; RoHS-compliant, JESD201 Class 2 whisker-tested; 0.375" (9.5 mm) lead length; UL 94 V-0 molded epoxy body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-side return path; forms clamping path during reverse-biased surge |
| Cathode | Protected line input | Connected to line being protected (e.g., 12 V supply or CAN-H); conducts surge current to ground when VBR exceeded |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables consistent clamping performance over 1000+ surge cycles without parameter drift |
| 1500 W peak pulse rating (10/1000 µs) | Meets ISO 7637-2 Pulse 5a (load dump) requirements for 12 V systems without external heat sinking |
| AEC-Q101 qualified (automotive grade) | Validated for automotive under-hood use including HTSL, TCT, and surge lifetime testing per AEC standard |
| Low clamping ratio (VC/VBR ≈ 1.57) | Minimizes overvoltage stress on protected ICs compared to higher-ratio TVS devices |
| Solderable per J-STD-002 & JESD22-B102 | Ensures reliable reflow and wave solder joint integrity in high-volume automotive PCB assembly |
Applications
| Engine Control Unit (ECU) Power Input | ABS Module Sensor Line Protection |
|---|---|
|
Use Scenario: Protects 12 V supply rail of engine control units against ISO 7637-2 load-dump transients up to 60 V/100 ms. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery feed and LDO input, clamping surges within 1 ns. Use Value: Prevents latch-up or permanent damage to microcontroller and CAN transceiver ICs during alternator field collapse events. |
Use Scenario: Shields analog sensor signal lines (e.g., wheel speed sensors) from coupled transients induced by solenoid actuation in ABS hydraulic units. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at connector interface, shunting EFT bursts before reaching op-amp front-end. Use Value: Maintains signal fidelity and prevents false triggering during high-dI/dt switching of 12 V solenoids near sensitive analog paths. |
| Infotainment System USB Port | Body Control Module (BCM) LIN Bus |
|
Use Scenario: Guards USB VBUS line in automotive infotainment head units against hot-plug and ESD events per IEC 61000-4-2 Level 4. IC Role / Device Role / Timing Role: Standoff-rated TVS with 5.5 V VWM placed upstream of USB power switch IC. Use Value: Blocks >15 kV contact ESD without disrupting 5 V regulation or causing brownout on connected peripherals. |
Use Scenario: Protects LIN transceiver pins in body control modules from battery reverse connection and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS tied between LIN bus and chassis ground, activated only during positive overvoltage events. Use Value: Enables fail-safe operation during 24 V jump-start scenarios while preserving LIN communication integrity at 19.2 kbps. |
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-E3/52 | Lower PPPM (600 W), smaller SMB package (vs. DO-201AD), tighter VBR tolerance (6.45–7.14 V) | Better suited for space-constrained PCBs; insufficient for full ISO 7637-2 Pulse 5a compliance | Select when board area is critical and surge energy is limited to ISO 7637-2 Pulse 1/2/3b only |
| 1.5KE6.8A | Same DO-201AD package but non-automotive grade; no AEC-Q101 qualification; higher leakage (5000 µA @ VWM) | Lacks validation for automotive temperature cycling and long-term surge endurance | Acceptable for industrial or consumer applications where AEC-Q101 is not mandated |
Compared with SMBJ6.8A-E3/52 and 1.5KE6.8A, the 1.5KA6.8HE3/51 uniquely combines AEC-Q101 qualification, 1500 W surge capability, and low-temperature-coefficient VBR - making it the only option qualified for under-hood automotive power rail protection requiring full load-dump immunity.
Availability
1.5KA6.8HE3/51 is available at Aetrix Electronics and suitable for automotive electronics, engine management systems, and safety-critical sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1.5KA6.8HE3/51 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 demanding industrial and automotive environments.
The 1.5KA series was engineered specifically for AEC-Q101-compliant transient suppression in automotive power distribution networks - emphasizing thermal stability, surge endurance, and consistent clamping under extreme ambient conditions.
FAQ
What is the AEC-Q101 qualification status of the 1.5KA6.8HE3/51?
The 1.5KA6.8HE3/51 is explicitly qualified to AEC-Q101 standards, as confirmed in Vishay document 88300 (Revision 20-Oct-08), Note (1). This includes stress testing for high-temperature reverse bias, temperature cycling, and surge lifetime - validating its suitability for automotive under-hood applications. The HE3 suffix further denotes RoHS compliance and JESD201 Class 2 whisker resistance.
Does the 1.5KA6.8HE3/51 support bidirectional transient suppression?
No, the 1.5KA6.8HE3/51 is unidirectional only, as stated in the FEATURES section of the datasheet. It protects against positive-going transients on a line referenced to ground and must be oriented with the cathode toward the protected line. For bidirectional protection, two 1.5KA6.8HE3/51 devices would need back-to-back configuration - though Vishay offers dedicated bidirectional variants like 1.5KA6.8CAHE3/51.
What is the maximum clamping voltage of the 1.5KA6.8HE3/51 at rated peak pulse current?
The 1.5KA6.8HE3/51 clamps to a maximum of 10.8 V at 139 A peak pulse current (IPPM), measured with a 10/1000 µs waveform per Figure 1 and Table on page 2 of document 88300. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events.
Can the 1.5KA6.8HE3/51 be used in 24 V automotive systems?
Yes - the 1.5KA6.8HE3/51 is routinely deployed in 24 V commercial vehicle systems, particularly on auxiliary power feeds and sensor excitation lines. Its 185 °C max junction temperature and AEC-Q101 qualification ensure reliability even when mounted near high-heat sources. However, its 5.5 V stand-off voltage means it is not intended for direct 24 V rail protection; instead, it safeguards downstream 5 V or 3.3 V sub-circuits fed from DC-DC converters.
How does the 1.5KA6.8HE3/51 differ from the 1.5KA6.8A variant?
The 1.5KA6.8HE3/51 and 1.5KA6.8A share identical electrical specs (VBR: 6.12–7.48 V, VC: 10.8 V, PPPM: 1500 W), but differ in packaging and qualification: 1.5KA6.8HE3/51 uses the HE3 tape-and-reel packaging (1400 pcs/reel, 13" diameter) and carries full AEC-Q101 certification, whereas 1.5KA6.8A may appear in alternate packaging formats and lacks the HE3-specific traceability and whisker-test compliance.
1.5KA6.8HE3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- PAR®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5.5V
- Voltage - Breakdown (Min):
- 6.12V
- Voltage - Clamping (Max) @ Ipp:
- 10.8V
- Current - Peak Pulse (10/1000µs):
- 139A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KA
1.5KA6.8HE3/51 FAQ
1.How can I place an order for 1.5KA6.8HE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA6.8HE3/51 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 1.5KA6.8HE3/51 reliable?
The price and inventory of 1.5KA6.8HE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA6.8HE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KA6.8HE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA6.8HE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KA6.8HE3/51?
1.5KA6.8HE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA6.8HE3/51 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 1.5KA6.8HE3/51?
For technical support, including 1.5KA6.8HE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA6.8HE3/51 requirements.
6.How does Aetrix verify that 1.5KA6.8HE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KA6.8HE3/51 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 1.5KA6.8HE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KA6.8HE3/51?
All 1.5KA6.8HE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA6.8HE3/51, 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 1.5KA6.8HE3/51 part is unused and in its original packaging.
Return procedure for 1.5KA6.8HE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA6.8HE3/51 Tags
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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