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Vishay General Semiconductor - Diodes Division 1.5KA9.1HE3/73
- Part No.:
- 1.5KA9.1HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA9.1HE3/73.pdf
- Description:
- TVS DIODE 7.78VWM 13.4VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:8,914
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Product details
Overview
1.5KA9.1HE3/73 from Vishay General Semiconductor is an automotive-grade unidirectional transient voltage suppressor (TVS) diode with 1500 W peak pulse power (10/1000 µs), 8.19–10.0 V breakdown voltage, and AEC-Q101 qualification. It clamps transients to ≤13.8 V at 109 A, operates from –65 °C to +185 °C, and protects MOSFETs and sensor signal lines in automotive powertrain control units.
For engineers reviewing the 1.5KA9.1HE3/73 datasheet, 1.5KA9.1HE3/73 pinout, 1.5KA9.1HE3/73 application, or 1.5KA9.1HE3/73 equivalent, this page delivers verified electrical specs, JEDEC TO-277A package details, AEC-Q101 reliability context, clamping performance at rated surge current, and direct alternatives for automotive ESD/surge protection design.
Technical Context
This TVS diode uses 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 and signal lines where forward conduction must be avoided.
Designed for automotive environments, it sustains 185 °C junction temperature and meets JESD201 Class 2 whisker resistance. The 10/1000 µs waveform rating reflects real-world load-dump and inductive switching surge profiles per ISO 7637-2 and SAE J1113-11.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - withstands automotive load-dump surges without failure |
| Breakdown Voltage VBR | 8.19–10.0 V at 1.0 mA - defines precise clamping initiation threshold |
| 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 - maximum continuous reverse voltage before leakage exceeds 50 µA |
| Operating Temperature Range | –65 °C to +185 °C - supports under-hood placement in engine control modules |
| AEC-Q101 Qualified | Yes - validated for automotive reliability including temperature cycling and HTRB |
| RoHS & WEEE Compliant | Yes - HE3 suffix denotes lead-free, high-reliability, automotive-grade construction |
Pinout & Package
Package: JEDEC TO-277A (Case Style 1.5KA), molded epoxy body with matte tin-plated leads; cathode indicated by color band; UL 94 V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to ground or low-side reference | Enables unidirectional clamping - conducts only when cathode is > anode by ≥VF |
| Cathode | Protected line connection; voltage sensing node | Connected to supply rail or signal line; clamps to VC when transient exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Ensures stable VBR and low dynamic impedance across –65 °C to +185 °C |
| 1500 W peak pulse power (10/1000 µs) | Meets ISO 7637-2 Pulse 5a load-dump immunity requirements for 12 V systems |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth in high-humidity, high-temperature automotive environments |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., relay coil de-energization) |
| Solder dip 260 °C, 40 s | Compatible with standard lead-free reflow and wave soldering processes |
Applications
| Engine Control Unit (ECU) Power Input Protection | Automotive Sensor Signal Line Protection |
|---|---|
Use Scenario: Protects 12 V supply rail of diesel/gasoline engine ECUs against ISO 7637-2 Pulse 5a load-dump transients up to 35 V. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery input and DC-DC converter input stage. Use Value: Clamps surge to ≤13.8 V at 109 A, preventing overvoltage damage to downstream PMICs and microcontrollers. | Use Scenario: Shields analog output lines of crankshaft position sensors from ESD and inductive switching noise in transmission control modules. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on 5 V sensor supply or signal return path. Use Value: Maintains <50 µA leakage at 7.37 V stand-off, avoiding signal offset while suppressing ±30 kV contact ESD per ISO 10605. |
| Body Control Module (BCM) LIN Bus Protection | Electric Power Steering (EPS) Motor Driver Protection |
Use Scenario: Safeguards LIN transceiver I/O pins against coupled transients from adjacent 12 V power circuits in door modules and lighting controllers. IC Role / Device Role / Timing Role: Point-of-load TVS on LIN bus line, placed immediately before transceiver input. Use Value: Fast response time and 13.8 V clamping prevent false LIN frame errors during ignition switching events. | Use Scenario: Protects half-bridge gate drivers in EPS motor inverters from voltage spikes induced by motor phase commutation. IC Role / Device Role / Timing Role: Unidirectional TVS on high-side driver supply rail (VDD) referenced to power ground. Use Value: Withstands 200 A non-repetitive forward surge (8.3 ms), enabling robust operation during motor stall conditions. |
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 peak pulse power (600 W), same 9.0 V nominal VBR, SMB package (smaller footprint) | Suitable for lower-energy transients (e.g., ISO 10605 ESD only); not rated for load-dump | Select when space-constrained and surge energy <600 W; verify clamping margin at system-level test |
| 1.5KE9.1A | Same 1500 W rating and 9.1 V VBR, but DO-201 package and no AEC-Q101 qualification | Lacks automotive reliability validation; higher thermal resistance than TO-277A | Acceptable for industrial/commercial use where AEC-Q101 is not mandated; requires derating above 75 °C |
Compared with SMBJ9.0AHE3/52 and 1.5KE9.1A, the 1.5KA9.1HE3/73 uniquely combines AEC-Q101 qualification, TO-277A thermal performance, and full 1500 W load-dump capability - making it the only option qualified for critical automotive power rail protection without layout or reliability compromise.
Availability
1.5KA9.1HE3/73 is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, electric power steering systems, and advanced driver-assistance sensor interfaces requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for 1.5KA9.1HE3/73 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, optoelectronics, and passive components 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 parametric consistency under temperature cycling and humidity stress.
FAQ
What is the clamping voltage of the 1.5KA9.1HE3/73 at its rated peak pulse current?
The 1.5KA9.1HE3/73 has a maximum clamping voltage (VC) of 13.8 V at its rated peak pulse current (IPPM) of 109 A, measured with a 10/1000 µs waveform at TA = 25 °C. This value ensures downstream ICs see limited overvoltage during standardized automotive surge events, and is confirmed in the Electrical Characteristics table of Vishay document 88300.
Is the 1.5KA9.1HE3/73 suitable for bidirectional transient protection?
No - the 1.5KA9.1HE3/73 is unidirectional only, as explicitly stated in the Features section of its datasheet. It functions as a reverse-biased Zener-like clamp and conducts significantly only when cathode voltage exceeds anode voltage by ≥VBR; for bidirectional protection, a separate device such as the 1.5SMC9.0CAHE3 is required.
Does the 1.5KA9.1HE3/73 meet AEC-Q101 stress test requirements?
Yes - the 1.5KA9.1HE3/73 carries the HE3 suffix denoting AEC-Q101 qualification, confirmed in the Mechanical Data section and footnote (1) of the datasheet. It has passed temperature cycling, high-temperature reverse bias (HTRB), and accelerated moisture resistance testing per the AEC-Q101 standard for discrete semiconductors.
What is the maximum steady-state power dissipation of the 1.5KA9.1HE3/73?
The 1.5KA9.1HE3/73 has a maximum steady-state power dissipation (PD) of 6.5 W when mounted on an infinite heatsink at lead temperature (TL) = 75 °C, as specified in the Maximum Ratings table. This value decreases linearly above 25 °C ambient per the derating curve in Figure 2 of document 88300.
How does the 1.5KA9.1HE3/73 differ from the 1.5KA9.1A variant?
The 1.5KA9.1HE3/73 has a breakdown voltage range of 8.19–10.0 V at 1.0 mA, while the 1.5KA9.1A variant tightens this to 8.65–9.55 V. Both share identical package, power rating, clamping voltage (13.4 V for 1.5KA9.1A), and AEC-Q101 qualification; the 'A' suffix indicates tighter VBR tolerance for designs requiring precise clamping threshold control.
1.5KA9.1HE3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- PAR®
- Packaging:
- Tape & Box (TB)
- 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
1.5KA9.1HE3/73 FAQ
1.How can I place an order for 1.5KA9.1HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA9.1HE3/73 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 1.5KA9.1HE3/73 reliable?
The price and inventory of 1.5KA9.1HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA9.1HE3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KA9.1HE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA9.1HE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KA9.1HE3/73?
1.5KA9.1HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA9.1HE3/73 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 1.5KA9.1HE3/73?
For technical support, including 1.5KA9.1HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA9.1HE3/73 requirements.
6.How does Aetrix verify that 1.5KA9.1HE3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KA9.1HE3/73 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 1.5KA9.1HE3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KA9.1HE3/73?
All 1.5KA9.1HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA9.1HE3/73, 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 1.5KA9.1HE3/73 part is unused and in its original packaging.
Return procedure for 1.5KA9.1HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA9.1HE3/73 Tags
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