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Vishay General Semiconductor - Diodes Division 1.5KA43HE3/51
- Part No.:
- 1.5KA43HE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA43HE3/51.pdf
- Description:
- TVS DIODE 34.8VWM 61.9VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:6,026
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Product details
Overview
1.5KA43HE3/51 from Vishay General Semiconductor is an automotive-grade unidirectional 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 61.9 V under 24.2 A surge current, and operates up to +185 °C junction temperature - deployed in engine control units, ABS modules, and powertrain sensor interfaces.
For engineers reviewing the 1.5KA43HE3/51 datasheet, 1.5KA43HE3/51 pinout, 1.5KA43HE3/51 application, or 1.5KA43HE3/51 equivalent, key selection criteria include AEC-Q101 qualification, 34.8 V stand-off voltage, ±0.101 %/°C VBR tempco, low incremental surge resistance, and RoHS-compliant HE3 packaging with JESD201 Class 2 whisker resistance.
Technical Context
This TVS diode uses patented PAR® construction to achieve stable clamping under repetitive transients and high-temperature operation. Its unidirectional polarity enables precise reverse-biased overvoltage protection on DC power rails and signal lines, with fast response time (<1 ns) and low dynamic impedance ensuring minimal let-through energy during ESD or load-dump events.
Designed for automotive applications per ISO 7637-2 and ISO 16750-2, it supports 200 A non-repetitive forward surge (8.3 ms half-sine) and maintains <1 µA leakage at 34.8 V (TJ = 150 °C), enabling reliable protection of downstream MOSFETs and microcontrollers without standby power penalty.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - sustains automotive load-dump surges without degradation |
| Clamping Voltage (VC) | 61.9 V at 24.2 A - limits voltage seen by protected IC to safe level during surge |
| Stand-off Voltage (VWM) | 34.8 V - ensures no conduction during normal 24 V system operation |
| Breakdown Voltage (VBR) | 38.7–47.3 V at 1 mA - defines precise turn-on threshold for transient suppression |
| Operating Temperature Range | −65 °C to +185 °C - qualified for under-hood automotive placement |
| AEC-Q101 Qualified | Yes - validated for automotive reliability including temperature cycling and HTRB |
| RoHS & Whisker Compliance | HE3 suffix meets RoHS 2002/95/EC and JESD201 Class 2 |
Pinout & Package
Package: Case Style 1.5KA - molded epoxy body with matte tin-plated leads; UL 94 V-0 rated; lead length 9.5 mm; diameter 4.8–5.3 mm; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to ground or low-side reference | Enables unidirectional clamping from cathode to anode during reverse transients |
| Cathode | Protected line connection; voltage sensing node | Connected to supply rail or signal line; absorbs surge energy into ground path when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Ensures consistent VBR and low dynamic impedance across temperature and life cycle |
| 1500 W peak pulse rating | Withstands ISO 7637-2 Pulse 5a (load dump) without failure or parameter shift |
| AEC-Q101 qualification | Validated for automotive use including HTGB, TCT, and HTRB stress tests |
| Low clamping ratio (VC/VBR ≈ 1.6) | Minimizes overvoltage stress on protected devices compared to standard Zener-based TVS |
| Matte tin plating + JESD201 Class 2 | Prevents tin whisker growth in high-reliability automotive assemblies |
Applications
| Engine Control Unit (ECU) Power Input Protection | ABS Module CAN Bus Line Protection |
|---|---|
Use Scenario: Protects 12 V/24 V power input of engine control units against ISO 7637-2 load-dump transients up to 60 V. IC Role / Device Role / Timing Role: Unidirectional TVS clamps excess energy into chassis ground before reaching MCU power regulator. Use Value: Prevents brownout or latch-up of automotive-grade microcontrollers during cold-cranking and alternator field decay events. | Use Scenario: Shields differential CANH/CANL lines in anti-lock braking systems from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) TVS placed at connector interface to absorb sub-100 ns transients without signal distortion. Use Value: Maintains CAN FD bit integrity at 5 Mbps while meeting ISO 10605 ESD immunity requirements (±25 kV air). |
| Powertrain Sensor Signal Conditioning | Body Control Module (BCM) LIN Bus Protection |
Use Scenario: Safeguards analog outputs of knock, MAP, and throttle position sensors exposed to ignition coil coupling. IC Role / Device Role / Timing Role: Stand-off voltage (34.8 V) avoids interference with 5 V or 3.3 V sensor supply rails; fast response prevents ADC saturation. Use Value: Eliminates false fault codes caused by transient-induced offset drift in precision ratiometric sensor interfaces. | Use Scenario: Protects LIN transceivers in door modules and lighting controllers from battery disconnect spikes and relay bounce. IC Role / Device Role / Timing Role: Unidirectional configuration matches LIN bus DC bias (12 V); clamping action preserves 19.2 kbps timing margins. Use Value: Enables robust communication during vehicle start-stop cycles without bus reset or timeout errors. |
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 VC (58.1 V), same AEC-Q101 and HE3 package | Better suited for 12 V systems with lower surge energy; not rated for 24 V load-dump compliance | Select when system-level testing confirms ≤600 W surge exposure and tighter clamping is required |
| 1.5KE43A | Same VBR range but non-automotive grade; no AEC-Q101; higher leakage at elevated temperature | Limited to industrial/commercial use; unsuitable for under-hood deployment due to 150 °C max TJ | Use only in non-automotive designs where cost sensitivity outweighs reliability and temperature margin requirements |
Compared with 1.5KA43HE3/51, SMBJ36AHE3/52 offers reduced surge capacity but tighter clamping for 12 V domains, while 1.5KE43A lacks automotive qualification and thermal robustness - making 1.5KA43HE3/51 the sole choice for AEC-Q101-compliant 24 V powertrain protection.
Availability
1.5KA43HE3/51 is available at Aetrix Electronics and suitable for engine control units, ABS modules, and powertrain sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1.5KA43HE3/51 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, rectifiers, and protection devices for automotive, industrial, and computing markets.
The 1.5KA series was engineered specifically for AEC-Q101-compliant automotive transient suppression, targeting under-hood power distribution and high-speed data bus protection where thermal stability and surge endurance are critical.
FAQ
What is the maximum clamping voltage of the 1.5KA43HE3/51 under specified surge conditions?
The 1.5KA43HE3/51 exhibits a maximum clamping voltage (VC) of 61.9 V when subjected to its rated peak pulse current of 24.2 A using the standardized 10/1000 µs waveform. This value is measured at TA = 25 °C and guarantees that protected circuitry will not experience voltages exceeding this threshold during defined surge events - a critical parameter for safeguarding 3.3 V or 5 V logic interfaces downstream of the 1.5KA43HE3/51.
Is the 1.5KA43HE3/51 suitable for 24 V automotive power systems?
Yes, the 1.5KA43HE3/51 is explicitly designed for 24 V automotive systems. Its 34.8 V stand-off voltage (VWM) provides adequate margin above nominal 24 V rail fluctuations, while its 38.7–47.3 V breakdown range and 61.9 V clamping ensure effective suppression of ISO 7637-2 Pulse 5a load-dump transients. The device's AEC-Q101 qualification and 185 °C maximum junction temperature further confirm its suitability for under-hood deployment in commercial and heavy-duty vehicles using 24 V architecture.
Does the 1.5KA43HE3/51 have bidirectional polarity?
No, the 1.5KA43HE3/51 is a unidirectional TVS diode only, as confirmed in the "FEATURES" section of Vishay Document 88300. It functions as a reverse-biased avalanche device, conducting only when cathode voltage exceeds anode voltage by more than VBR. This configuration is optimal for DC power rail protection where polarity is fixed - unlike bidirectional variants used for AC or differential signal lines. The cathode is marked by a color band on the 1.5KA43HE3/51 package body.
What does the "HE3" suffix indicate in 1.5KA43HE3/51?
The "HE3" suffix in 1.5KA43HE3/51 denotes Vishay's high-reliability, automotive-grade packaging: RoHS-compliant matte tin-plated leads, solderable per J-STD-002 and JESD22-B102, and certified to JESD201 Class 2 for tin whisker resistance. This suffix replaces legacy "AEC-Q101 qualified" labeling and confirms compliance with automotive assembly and long-term reliability requirements - distinguishing it from commercial-grade equivalents like 1.5KA43A without the HE3 designation.
How does the 1.5KA43HE3/51 perform at elevated temperatures?
The 1.5KA43HE3/51 maintains full functionality up to +185 °C junction temperature, with derated pulse power per Figure 2 in Vishay Document 88300. At 150 °C, its maximum reverse leakage remains ≤1 µA at VWM = 34.8 V - critical for preventing false triggering in hot under-hood locations. Its ±0.101 %/°C VBR temperature coefficient ensures predictable clamping behavior across the full automotive operating range, a key advantage over non-automotive TVS diodes with wider tempcos.
1.5KA43HE3/51 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):
- 34.8V
- Voltage - Breakdown (Min):
- 38.7V
- Voltage - Clamping (Max) @ Ipp:
- 61.9V
- Current - Peak Pulse (10/1000µs):
- 24.2A
- 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
1.5KA43HE3/51 FAQ
1.How can I place an order for 1.5KA43HE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA43HE3/51 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 1.5KA43HE3/51 reliable?
The price and inventory of 1.5KA43HE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA43HE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KA43HE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA43HE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KA43HE3/51?
1.5KA43HE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA43HE3/51 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 1.5KA43HE3/51?
For technical support, including 1.5KA43HE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA43HE3/51 requirements.
6.How does Aetrix verify that 1.5KA43HE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KA43HE3/51 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 1.5KA43HE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KA43HE3/51?
All 1.5KA43HE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA43HE3/51, 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 1.5KA43HE3/51 part is unused and in its original packaging.
Return procedure for 1.5KA43HE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA43HE3/51 Tags
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