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Vishay General Semiconductor - Diodes Division 1.5KA39AHE3/73
- Part No.:
- 1.5KA39AHE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA39AHE3/73.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:4,720
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Product details
Overview
1.5KA39AHE3/73 from Vishay General Semiconductor is an automotive-grade unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in power and signal lines. It features a 39 V breakdown voltage (VBR = 37.1–41.0 V), 1500 W peak pulse power (10/1000 µs), 27.8 A peak pulse current (IPPM), 53.9 V clamping voltage (VC), and AEC-Q101 qualification for under-hood automotive electronics.
For engineers reviewing the 1.5KA39AHE3/73 datasheet, 1.5KA39AHE3/73 pinout, 1.5KA39AHE3/73 application, or 1.5KA39AHE3/73 equivalent, this device is selected for robust overvoltage protection in 12 V/24 V automotive systems where high-temperature stability (TJ up to +185 °C), low clamping ratio, and RoHS-compliant HE3 packaging are critical design requirements.
Technical Context
This TVS diode employs Vishay's patented PAR® construction for stable avalanche behavior 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 capacitance (typ. <100 pF at 1 MHz) preserving signal integrity in sensor and communication lines.
Rated for 185 °C maximum junction temperature and qualified per AEC-Q101, the 1.5KA39AHE3/73 supports operation in harsh automotive environments - including engine control units, body electronics, and ADAS power supplies - where thermal derating above 25 °C must be applied per Fig. 2 of Document 88300.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V - Ensures reliable turn-on above nominal 36 V system rail while avoiding false triggering during load dump transients. |
| VC @ IPPM | 53.9 V - Clamps induced surges to safe levels for downstream 50 V-rated MOSFETs and controllers. |
| PPPM | 1500 W (10/1000 µs) - Withstands ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Level 4 surges. |
| IPPM | 27.8 A - Matches typical automotive surge current demands without requiring oversized PCB traces. |
| TJ max. | +185 °C - Enables direct mounting near heat sources (e.g., power inverters) without thermal derating penalties. |
| Package | Case Style 1.5KA - Axial-leaded, epoxy-molded package with UL 94 V-0 rating and matte tin-plated leads compliant to J-STD-002. |
Pinout & Package
Case Style 1.5KA is an axial-leaded, through-hole package with cathode indicated by a color band. Leads are matte tin-plated, solderable per J-STD-002 and JESD22-B102, and qualified for solder dip (260 °C, 40 s). The HE3 suffix denotes AEC-Q101 qualification and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC return path for clamping current | Connected to ground or low-side reference; carries full surge current during transient events. |
| Cathode | Protected line connection point | Connected to the line being protected (e.g., battery rail); avalanche conduction begins when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Ensures uniform avalanche distribution across junction area, minimizing localized hot spots and enabling repeatable 1500 W surge handling. |
| AEC-Q101 qualification | Validates reliability under automotive stress conditions including temperature cycling, humidity bias, and mechanical shock - required for ECU and powertrain applications. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Delivers tighter voltage margin between operating rail and clamp level, reducing risk of overvoltage damage to sensitive ICs. |
| RoHS-compliant HE3 packaging | Meets automotive supply chain requirements with JESD201 Class 2 whisker resistance and lead-free compatibility for reflow and wave soldering. |
Applications
| Engine Control Unit (ECU) Power Input | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protects 12 V supply input of engine control units against ISO 7637-2 Pulse 5a (load dump) and switching transients from fuel injectors or ignition coils. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed in parallel with input capacitor to clamp surges before they reach LDOs and microcontrollers. Use Value: Withstands 1500 W pulses and operates up to +185 °C, enabling direct placement near high-temperature engine bay components without derating. | Use Scenario: Shields BCM power rails and LIN bus interface lines from battery reversal, jump-start spikes, and relay coil flyback in door modules and lighting controls. IC Role / Device Role / Timing Role: Standoff voltage (VWM = 33.3 V) ensures no leakage during normal 12 V operation while clamping >39 V transients within 1 ns. Use Value: Low incremental surge resistance minimizes voltage overshoot during fast-rising transients, preserving signal timing margins on LIN and CAN physical layers. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Safeguards 5 V/3.3 V camera module power rails from ESD and conducted noise coupled from nearby radar or infotainment systems. IC Role / Device Role / Timing Role: Secondary TVS stage after primary front-end filtering; provides final-line-of-defense clamping with sub-100 pF capacitance. Use Value: Junction capacitance <100 pF at 1 MHz avoids signal distortion on high-speed MIPI CSI-2 video links connected to the camera sensor. | Use Scenario: Protects H-bridge gate drivers and current-sense amplifiers from inductive kickback generated during EPS motor commutation. IC Role / Device Role / Timing Role: Mounted across motor phase inputs to absorb energy from back-EMF, preventing latch-up or destruction of MOSFETs and op-amps. Use Value: 200 A peak forward surge rating (IFSM) accommodates repeated motor stall events without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36AHE3/52 | Lower PPPM (600 W), lower VBR (36–40 V), SMC package (surface-mount) | Not AEC-Q101 qualified; suitable for non-automotive industrial use only | Select when board space is constrained and automotive qualification is not required. |
| 1.5KE39A | Same VBR/VC specs but legacy 1.5KE case; not AEC-Q101 qualified; higher leakage at TJ = 150 °C | Lacks automotive reliability validation; limited to commercial/industrial temperature range (−65 to +150 °C) | Choose only for cost-sensitive non-automotive designs where AEC-Q101 is unnecessary. |
Compared with SMBJ36AHE3/52 and 1.5KE39A, the 1.5KA39AHE3/73 delivers higher surge robustness (1500 W vs. 600 W or 1500 W with inferior thermal rating), guaranteed automotive qualification, and superior high-temperature leakage performance - making it the sole choice for production-critical vehicle systems.
Availability
1.5KA39AHE3/73 is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and telecommunications infrastructure requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for 1.5KA39AHE3/73 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 diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, power handling, and automotive qualification.
The 1.5KA series was engineered specifically for automotive transient suppression - delivering high-temperature stability, low clamping voltage, and AEC-Q101 compliance to meet stringent OEM requirements for engine bay and chassis electronics.
FAQ
What is the exact breakdown voltage range for 1.5KA39AHE3/73?
The 1.5KA39AHE3/73 has a specified breakdown voltage (VBR) range of 37.1 V to 41.0 V at 1.0 mA test current (IT), per Vishay Document 88300 Rev. 20-Oct-08. This range ensures consistent avalanche initiation across production lots while accommodating thermal drift up to +185 °C junction temperature.
Is 1.5KA39AHE3/73 suitable for bidirectional surge protection?
No - the 1.5KA39AHE3/73 is unidirectional only, as explicitly stated in its datasheet features. It conducts in reverse bias (cathode-to-anode) during overvoltage events and blocks forward current up to 3.5 V at 100 A. For bidirectional protection, a pair of 1.5KA39AHE3/73 devices or a dedicated bidirectional TVS such as SMAJ33A would be required.
What does the "HE3" suffix mean on 1.5KA39AHE3/73?
The "HE3" suffix on 1.5KA39AHE3/73 indicates RoHS-compliant, high-reliability, automotive-grade construction: it meets AEC-Q101 qualification, passes JESD201 Class 2 whisker testing, and uses matte tin-plated leads compatible with J-STD-002 soldering standards - distinguishing it from commercial-grade variants like 1.5KA39A.
Can 1.5KA39AHE3/73 replace 1.5KE39A in existing designs?
1.5KA39AHE3/73 is not a drop-in replacement for 1.5KE39A due to differences in package dimensions, lead finish, and qualification status. While both share similar electrical specs, the 1.5KA39AHE3/73 uses Case Style 1.5KA (larger axial body) and requires layout verification. Its AEC-Q101 qualification and HE3 plating also necessitate updated reliability documentation.
What is the maximum clamping voltage of 1.5KA39AHE3/73 at rated surge current?
The maximum clamping voltage (VC) of 1.5KA39AHE3/73 is 53.9 V at 27.8 A peak pulse current (IPPM) with a 10/1000 µs waveform, as confirmed in Table "ELECTRICAL CHARACTERISTICS" of Vishay Document 88300. This value defines the upper voltage limit imposed on protected circuits during worst-case surge events.
1.5KA39AHE3/73 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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 27.8A
- 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
1.5KA39AHE3/73 FAQ
1.How can I place an order for 1.5KA39AHE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA39AHE3/73 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 1.5KA39AHE3/73 reliable?
The price and inventory of 1.5KA39AHE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA39AHE3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KA39AHE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA39AHE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KA39AHE3/73?
1.5KA39AHE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA39AHE3/73 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 1.5KA39AHE3/73?
For technical support, including 1.5KA39AHE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA39AHE3/73 requirements.
6.How does Aetrix verify that 1.5KA39AHE3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KA39AHE3/73 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 1.5KA39AHE3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KA39AHE3/73?
All 1.5KA39AHE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA39AHE3/73, 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 1.5KA39AHE3/73 part is unused and in its original packaging.
Return procedure for 1.5KA39AHE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA39AHE3/73 Tags
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