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Vishay General Semiconductor - Diodes Division 1.5KA39HE3/73
- Part No.:
- 1.5KA39HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA39HE3/73.pdf
- Description:
- TVS DIODE 31.6VWM 56.4VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:7,678
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Product details
Overview
1.5KA39HE3/73 from Vishay General Semiconductor is a unidirectional automotive-grade transient voltage suppressor (TVS) diode designed for high-energy surge protection in harsh environments. It delivers 1500 W peak pulse power (10/1000 µs), clamps at 56.4 V under 26.6 A peak pulse current, and operates up to +185 °C junction temperature - enabling robust protection of MOSFETs and sensor signal lines in automotive powertrain control units.
For engineers reviewing the 1.5KA39HE3/73 datasheet, 1.5KA39HE3/73 pinout, 1.5KA39HE3/73 application, or 1.5KA39HE3/73 equivalent, key selection criteria include its AEC Q101 qualification, 31.6 V stand-off voltage, low 0.100 %/°C VBR temperature coefficient, and HE3 suffix compliance with JESD201 Class 2 whisker resistance.
Technical Context
This TVS diode employs patented PAR® construction for stable clamping under repeated transients and features a molded epoxy case rated UL 94 V-0. Its unidirectional polarity and matte tin-plated leads meet J-STD-002 solderability and JESD22-B102 reliability standards.
Designed for automotive applications, it supports 200 A non-repetitive forward surge current (8.3 ms half-sine) and maintains clamping performance across -65 °C to +185 °C operating range, with derating applied above 25 °C ambient per Figure 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - sustains high-energy load dump and inductive switching surges without failure |
| Breakdown Voltage VBR | 35.1–42.9 V at 1 mA - defines precise voltage threshold for reliable overvoltage triggering |
| Stand-off Voltage VWM | 31.6 V - maximum continuous reverse voltage before leakage exceeds 1 µA at 25 °C |
| Clamping Voltage VC | 56.4 V at 26.6 A - limits protected circuit voltage during worst-case transient events |
| Junction Temperature Range | -65 °C to +185 °C - enables operation in engine bay and transmission control modules |
| AEC Q101 Qualified | Yes - certified for automotive electronic systems per stress test requirements |
| HE3 Suffix Compliance | JESD201 Class 2 whisker resistance - ensures long-term reliability under thermal cycling |
Pinout & Package
Package: Case Style 1.5KA - axial-leaded, molded epoxy body with cathode band marking; dimensions: 1.0" (25.4 mm) min length × 0.285" (7.2 mm) max diameter; UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to ground or low-side return path during clamping |
| Cathode | Current exit point in forward bias; marked by color band | Connected to protected line (e.g., sensor supply or CAN bus) to shunt surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables consistent clamping performance and low incremental surge resistance across lifetime |
| 1500 W peak pulse power (10/1000 µs) | Handles ISO 7637-2 Pulse 5a/b load dump transients without degradation |
| AEC Q101 qualification | Validated for automotive use including temperature cycling, humidity, and mechanical shock |
| Low VBR tempco (0.100 %/°C) | Minimizes voltage drift over wide ambient ranges in under-hood electronics |
| Matte tin-plated leads | Ensures solder joint integrity and compatibility with lead-free reflow processes |
Applications
| Engine Control Unit (ECU) Power Input Protection | Automotive Sensor Signal Line Protection |
|---|---|
Use Scenario: Protects 12 V power rail in engine control units against ISO 7637-2 load dump transients up to 120 V. IC Role / Device Role / Timing Role: TVS diode clamps surge energy to safe levels before reaching MCU power regulators and gate drivers. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V LDOs and microcontrollers during cold-crank and alternator regulation faults. |
Use Scenario: Shields analog outputs of pressure, temperature, and position sensors from ESD and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between sensor output and microcontroller ADC input. Use Value: Maintains signal integrity below 31.6 V stand-off while limiting transients to ≤56.4 V, preserving 12-bit ADC accuracy. |
| Body Control Module (BCM) LIN Bus Protection | Transmission Control Module (TCM) Solenoid Driver Protection |
Use Scenario: Guards LIN physical layer transceivers against cable discharge events and battery reversal spikes. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between LIN line and ground, with fast response time <1 ns. Use Value: Ensures bus communication remains functional after ±8 kV contact ESD per IEC 61000-4-2 without signal distortion. |
Use Scenario: Suppresses back-EMF from 12 V solenoid valves during PWM switching in automatic transmission valve bodies. IC Role / Device Role / Timing Role: High-power TVS placed across solenoid coil terminals to absorb inductive energy. Use Value: Eliminates need for freewheeling diodes while sustaining 200 A surge current and 1500 W pulse power. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36AHE3/52 | Lower peak pulse power (600 W), lower clamping voltage (58.1 V at 10.3 A), DO-214AA package | Targeted at lower-energy surges; not qualified to AEC Q101 | Use where space-constrained PCB layout favors SMD and surge energy is limited to ISO 7637-2 Pulse 1/2 |
| 1.5KE39A | Same VBR range but legacy 1.5KE package; no HE3 whisker rating; not AEC Q101 qualified | General industrial use only; lacks automotive reliability validation | Select only for cost-sensitive non-automotive designs where AEC Q101 and JESD201 Class 2 are not required |
Compared with SMBJ36AHE3/52 and 1.5KE39A, the 1.5KA39HE3/73 provides higher surge robustness (1500 W vs. 600 W or 1500 W with inferior reliability), guaranteed automotive qualification, and enhanced whisker resistance - making it the sole choice for safety-critical powertrain and chassis modules.
Availability
1.5KA39HE3/73 is available at Aetrix Electronics and suitable for automotive powertrain control, body electronics protection, and industrial motor drive systems requiring stable component supply and long-term lifecycle support.
Supply support for 1.5KA39HE3/73 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, rectifiers, and protection devices for demanding industrial and automotive applications.
The 1.5KA series was developed specifically for AEC Q101-compliant transient suppression in automotive power systems, emphasizing thermal stability, surge endurance, and long-term whisker resistance under thermal cycling.
FAQ
What is the clamping voltage of the 1.5KA39HE3/73 under peak pulse conditions?
The 1.5KA39HE3/73 has a maximum clamping voltage (VC) of 56.4 V at 26.6 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected downstream components remain below their absolute maximum voltage ratings during surge events.
Is the 1.5KA39HE3/73 qualified for automotive use?
Yes, the 1.5KA39HE3/73 is AEC Q101 qualified and designated as high-reliability/automotive grade per its HE3 suffix. It meets rigorous stress testing for temperature cycling, humidity, mechanical shock, and solderability - confirming suitability for engine control, transmission, and ADAS modules.
What does the HE3 suffix mean on the 1.5KA39HE3/73?
The HE3 suffix on the 1.5KA39HE3/73 indicates RoHS compliance, high-reliability construction, and qualification to JESD201 Class 2 for tin whisker resistance. It also confirms adherence to AEC Q101 automotive qualification standards and matte tin plating per J-STD-002.
Can the 1.5KA39HE3/73 be used in bidirectional configurations?
No, the 1.5KA39HE3/73 is available in uni-directional polarity only, as explicitly stated in the Vishay datasheet. For bidirectional protection, a separate pair of 1.5KA39HE3/73 devices or a dedicated bi-directional TVS such as SMAJ33A must be used.
What is the maximum operating junction temperature for the 1.5KA39HE3/73?
The 1.5KA39HE3/73 has a maximum operating junction temperature (TJ) of +185 °C, validated per the datasheet's "Maximum Ratings" table. This allows deployment in high-temperature zones such as near engines, exhaust manifolds, or power inverters without thermal derating concerns below that limit.
1.5KA39HE3/73 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):
- 31.6V
- Voltage - Breakdown (Min):
- 35.1V
- Voltage - Clamping (Max) @ Ipp:
- 56.4V
- Current - Peak Pulse (10/1000µs):
- 26.6A
- 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
1.5KA39HE3/73 FAQ
1.How can I place an order for 1.5KA39HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA39HE3/73 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 1.5KA39HE3/73 reliable?
The price and inventory of 1.5KA39HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA39HE3/73 is usually 5 days.
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Once your 1.5KA39HE3/73 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 1.5KA39HE3/73?
For technical support, including 1.5KA39HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA39HE3/73 requirements.
6.How does Aetrix verify that 1.5KA39HE3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KA39HE3/73 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 1.5KA39HE3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KA39HE3/73?
All 1.5KA39HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA39HE3/73, 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 1.5KA39HE3/73 part is unused and in its original packaging.
Return procedure for 1.5KA39HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA39HE3/73 Tags
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