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Vishay General Semiconductor - Diodes Division 1.5KA9.1HE3/51
- Part No.:
- 1.5KA9.1HE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA9.1HE3/51.pdf
- Description:
- TVS DIODE 7.78VWM 13.4VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:5,640
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Product details
Overview
1.5KA9.1HE3/51 from Vishay General Semiconductor is a unidirectional automotive-grade transient voltage suppressor (TVS) diode designed for clamping inductive switching surges and lightning-induced transients on power rails and signal lines. It delivers 1500 W peak pulse power (10/1000 µs), has a breakdown voltage range of 8.19–10.0 V at 1.0 mA, clamps to ≤13.8 V at 109 A, and operates from −65 °C to +185 °C - used in engine control units, ABS modules, and automotive sensor interfaces.
For engineers reviewing the 1.5KA9.1HE3/51 datasheet, 1.5KA9.1HE3/51 pinout, 1.5KA9.1HE3/51 application, or 1.5KA9.1HE3/51 equivalent, key selection criteria include AEC Q101 qualification, 13.8 V clamping voltage at rated IPPM, 7.37 V stand-off voltage, low 0.068 %/°C VBR temperature coefficient, and RoHS-compliant HE3 packaging with JESD201 Class 2 whisker resistance.
Technical Context
This TVS diode employs Vishay's patented PAR® construction for stable high-temperature operation and low incremental surge resistance. Its unidirectional polarity enables precise reverse-biased clamping on DC power rails, with fast response time (<1 ns) and minimal junction capacitance (typically <1000 pF at VWM) ensuring minimal signal distortion on protected lines.
Rated for 185 °C maximum junction temperature and qualified per AEC Q101, the 1.5KA9.1HE3/51 supports automotive under-hood applications where thermal derating above 25 °C must be applied per Figure 2. The device sustains 200 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits 3.5 V max forward voltage at 100 A, enabling robust protection during load dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - withstands severe automotive load dump and ISO 7637-2 pulse 5a transients without failure |
| Breakdown Voltage VBR | 8.19–10.0 V at 1.0 mA - defines precise clamping initiation threshold for 9.1 V nominal systems |
| Clamping Voltage VC | ≤13.8 V at 109 A - limits downstream IC voltage stress during full-rated surge |
| Stand-off Voltage VWM | 7.37 V - ensures reliable blocking during normal 6–7 V system operation with margin |
| Junction Temperature Range | −65 °C to +185 °C - supports direct mounting in high-heat zones like powertrain ECUs |
| AEC Q101 Qualified | Yes - validated for automotive reliability including HTGB, HTRB, and temperature cycling |
| RoHS & Whisker Rating | RoHS compliant; JESD201 Class 2 - eliminates tin whisker risk in long-life automotive assemblies |
Pinout & Package
Package: Case Style 1.5KA - molded epoxy body with matte tin-plated leads, UL 94 V-0 rated, lead length 0.375″ (9.5 mm), diameter 0.210″ (5.3 mm). Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Current exit terminal; marked with color band | Connected to protected line (e.g., battery rail or signal input) to enable reverse-bias clamping |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables stable VBR and low dynamic impedance across −65 °C to +185 °C operating range |
| 1500 W peak pulse power (10/1000 µs) | Meets ISO 7637-2 Pulse 5a severity level for 12 V automotive systems |
| Low clamping ratio (VC/VBR ≈ 1.69) | Minimizes overvoltage stress on downstream MOSFETs and microcontrollers |
| AEC Q101 qualification | Validated for automotive under-hood use with zero defects in accelerated life testing |
| HE3 suffix packaging | Ensures JESD201 Class 2 whisker resistance and RoHS compliance for long-term solder joint integrity |
Applications
| Engine Control Unit (ECU) Power Rail Protection | ABS Module Sensor Line Clamping |
|---|---|
Use Scenario: Protects 5 V and 12 V supply inputs in engine control units against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and local regulator input. Use Value: Clamps 109 A surge to ≤13.8 V, preventing damage to LDOs and MCU power domains while maintaining AEC Q101 compliance. |
Use Scenario: Shields wheel speed sensor analog outputs from EMI and inductive kickback in anti-lock braking systems. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between sensor signal line and chassis ground. Use Value: Limits transient overshoot to <14 V without distorting 1–15 kHz AC sensor signals due to sub-1000 pF junction capacitance. |
| Body Control Module (BCM) LIN Bus Protection | Automotive Camera Power Input Protection |
Use Scenario: Safeguards LIN transceiver I/O pins against ESD and cable discharge events in door modules and lighting controllers. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at connector interface, cathode to LIN line. Use Value: Provides 1500 W surge handling while maintaining signal integrity via fast <1 ns response and low leakage (<50 µA at 7.37 V). |
Use Scenario: Guards 12 V input of rear-view or surround-view camera modules against jump-start spikes and hot-swap transients. IC Role / Device Role / Timing Role: Primary clamping device on main power feed before DC/DC converter. Use Value: Sustains 200 A 8.3 ms surge without degradation, enabling reliable operation in high-vibration, high-temperature cabin environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ9.0AHE3/52 | Lower PPPM (600 W), tighter VBR tolerance (9.0–10.0 V), same AEC Q101 and HE3 packaging | Rated for lighter-duty transients; insufficient for ISO 7637-2 Pulse 5a in 12 V systems | Select when system-level surge energy is limited to ≤600 W and space constraints favor SMB package |
| 1.5KE9.1A | Same VBR/VC specs but non-automotive grade; no AEC Q101 qualification; higher leakage (200 µA at VWM) | Not approved for automotive safety-critical modules; requires additional qualification effort | Acceptable only for industrial or consumer designs where AEC Q101 is not mandated |
Compared with SMBJ9.0AHE3/52 and 1.5KE9.1A, the 1.5KA9.1HE3/51 uniquely combines 1500 W surge capability, AEC Q101 qualification, and low 50 µA leakage at 7.37 V - making it the only drop-in solution for production automotive power rail protection requiring full ISO 7637-2 compliance.
Availability
1.5KA9.1HE3/51 is available at Aetrix Electronics and suitable for engine control units, ABS modules, and body control modules requiring stable component supply across extended temperature ranges and automotive lifecycle demands.
Supply support for 1.5KA9.1HE3/51 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 optoelectronics for automotive, industrial, and computing markets.
The 1.5KA series was engineered specifically for AEC Q101-compliant transient suppression in harsh automotive environments, emphasizing thermal stability, surge robustness, and long-term whisker-free solderability.
FAQ
What is the clamping voltage of the 1.5KA9.1HE3/51 at its rated peak pulse current?
The 1.5KA9.1HE3/51 has a maximum clamping voltage (VC) of 13.8 V at its rated peak pulse current (IPPM) of 109 A, measured using the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components remain within safe voltage limits during surge events. The 1.5KA9.1HE3/51 achieves this with low dynamic impedance enabled by its PAR® construction.
Is the 1.5KA9.1HE3/51 qualified for automotive applications?
Yes, the 1.5KA9.1HE3/51 is explicitly qualified to AEC Q101 standards, as confirmed in the Vishay datasheet (Document Number 88300, Revision 20-Oct-08). It undergoes rigorous stress testing including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling. The HE3 suffix further certifies compliance with JESD201 Class 2 whisker resistance - essential for automotive under-hood reliability. The 1.5KA9.1HE3/51 is intended for production automotive use.
What is the stand-off voltage (VWM) of the 1.5KA9.1HE3/51, and why does it matter?
The 1.5KA9.1HE3/51 has a stand-off voltage (VWM) of 7.37 V, meaning it remains in high-impedance blocking mode up to this voltage under normal operation. This provides a 1.37 V margin below the typical 9 V nominal system voltage, preventing false triggering during ripple or noise. Exceeding VWM risks premature conduction and power loss - so the 1.5KA9.1HE3/51 is optimized for 9.1 V nominal rails where stable blocking is critical.
How does the 1.5KA9.1HE3/51 differ from the 1.5KA9.1A variant?
The 1.5KA9.1HE3/51 and 1.5KA9.1A share identical electrical specifications (VBR, VC, PPPM), but differ in packaging and qualification. The 1.5KA9.1HE3/51 carries the HE3 suffix, indicating RoHS compliance, AEC Q101 qualification, and JESD201 Class 2 whisker resistance. The 1.5KA9.1A lacks the HE3 designation and is not AEC Q101 qualified. For automotive production, only the 1.5KA9.1HE3/51 meets required reliability standards.
What is the maximum junction temperature rating for the 1.5KA9.1HE3/51?
The 1.5KA9.1HE3/51 has a maximum junction temperature (TJ) rating of +185 °C, verified per AEC Q101 test conditions. This allows direct placement near high-heat sources such as power MOSFETs or ignition drivers in engine compartments. Derating curves (Figure 2 in datasheet 88300) define allowable pulse power reduction above 25 °C ambient - critical for thermal design validation of the 1.5KA9.1HE3/51 in real-world layouts.
1.5KA9.1HE3/51 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):
- 7.78V
- Voltage - Breakdown (Min):
- 8.65V
- Voltage - Clamping (Max) @ Ipp:
- 13.4V
- Current - Peak Pulse (10/1000µs):
- 112A
- 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
1.5KA9.1HE3/51 FAQ
1.How can I place an order for 1.5KA9.1HE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA9.1HE3/51 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 1.5KA9.1HE3/51 reliable?
The price and inventory of 1.5KA9.1HE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA9.1HE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KA9.1HE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA9.1HE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KA9.1HE3/51?
1.5KA9.1HE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA9.1HE3/51 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 1.5KA9.1HE3/51?
For technical support, including 1.5KA9.1HE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA9.1HE3/51 requirements.
6.How does Aetrix verify that 1.5KA9.1HE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KA9.1HE3/51 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 1.5KA9.1HE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KA9.1HE3/51?
All 1.5KA9.1HE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA9.1HE3/51, 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 1.5KA9.1HE3/51 part is unused and in its original packaging.
Return procedure for 1.5KA9.1HE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA9.1HE3/51 Tags
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